• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A sensor circuit has been described for detecting a circuit change, e.g. circuit break. It comprises a permanent or electromagnet for generating a magnetic field, a detection system comprising one or more magnetic sensors configured to detect an at least one-dimensional magnetic field from the permanent magnet and to provide an output signal representative of said ten least one-dimensional magnetic field. The circuit also includes a control unit for detecting an event by comparing said output signal with reference data, said reference data comprising for at least one direction of said magnetic field a reference area with an upper limit and a lower limit, the upper limit and lower limit being magnetically unipolar to be.
    公开号:BE1024049B1
    申请号:E2016/5850
    申请日:2016-11-11
    公开日:2017-11-08
    发明作者:Bruno Boury
    申请人:Melexis Technologies Nv；
    IPC主号:
    专利说明:

    Magnetic sensor
    FIELD OF THE INVENTION
    The present invention relates to the field of magnetic detection. The present invention relates more specifically to methods and systems for magnetic detection for security, such as, for example, home security.
    BACKGROUND OF THE INVENTION
    In home security, magnetic security switches are often used to detect that a window / door is closed. Thus, essentially, the magnetic field along 1 direction (typically perpendicular to the IC surface) is compared to a user-defined threshold. This system provides good functionality in that non-contact magnetic position detection is robust against dirt that might otherwise affect other technologies, such as optical protection switches. It is also robust against wear and tear, unlike contact solutions such as microswitches and mechanical relays. FIG. 1 illustrates a conventional arrangement for a security switch.
    As a result, magnetic safety switches are very popular in home security systems and other (non-) safe closure detection systems, such as cheap closure detection systems and emergency exits.
    Magnetic safety switches are typically characterized by the fact that the switching threshold was either set at the factory by the sensor IC manufacturer or set at the end of the production line by the module or equipment manufacturer. This means that the switching accuracy is still exposed over time to possible dynamic variations: window not closed as well as usual or air gap change depending on temperature and time.
    The operating principle is as follows. In essence, the switch point Bop is crossed when the window is closed, after which an alarm goes off (OFF state) when the magnetic field has fallen below the BRP point. Bop and Brp can be the same value, but usually hysteresis is intentionally introduced to prevent false jump back and cause a scattering state (continuous on and off due to noise). The latter is illustrated in FIG. 2. The comparison function of a switch (e.g. sensor or CMOS magnetic sensor) in used systems is typically 1-bit information to check if the magnetic field is higher than a predetermined threshold in absolute value. This means that the accepted area (switch considered closed) is open-ended, and not a narrow area. In essence, the magnetic protection switch compares an absolute threshold (both the factory-set and the ones programmed at the end of the production line) with the measured magnetic field. People with bad intentions could benefit from this by applying an additional external magnetic field, whereby the sensor believes that the magnet is still in front of it when the magnet is pulled away. The fake external field must simply be at least as large as that induced by the safety switch magnet and the system believes that the window is still closed. FIG. 3 illustrates a detection scheme for a detection circuit as known from the prior art.
    Summary of the invention
    It is an object of embodiments of the present invention to provide efficient methods and systems for detecting opening or closing of a circuit, e.g. for security detection.
    It is an advantage of at least some embodiments of the present invention that the sensor can be adjusted over time to changes in the environment, e.g. adapted to changes due to temperature, air gap changes, etc.
    It is an advantage of at least some embodiments of the present invention that increased tamper protection is provided, e.g., so that the use of external magnetic fields in an attempt to counterfeit can be detected.
    It is an advantage of at least some embodiments of the present invention that forgery becomes practically impossible because highly specialized equipment in a highly controlled environment is required to tamper with 3D to accurately adjust the magnetic field.
    It is an advantage of at least some embodiments of the present invention that the sensor may include a micro-power functionality.
    It is an advantage of at least some embodiments of the present invention that the sensor can be adjusted by the user, and thus results in a sensor that can be adapted to the situation of the user.
    It is an advantage of at least some embodiments of the present invention that an easy interruption and mode setting can be achieved.
    The above object is achieved by a method and device according to the present invention.
    The present invention relates to a sensor circuit for detecting a circuit change, e.g. an interruption in the circuit, the sensor circuit comprising a permanent or electromagnet for generating a magnetic field, a detection system comprising one or more magnetic sensors configured for detecting of an at least one dimensional magnetic field of the permanent magnet, and for providing an output signal representative of an at least one dimensional magnetic field, and a control unit for detecting an incident by comparing said output signal with reference data, wherein said reference data for at least one direction of said magnetic field comprises a reference range with an upper limit and a lower limit, wherein the upper limit and lower limit are magnetically unipolar.
    It is an advantage of at least some embodiments that the system is difficult to bypass due to saturation with an external magnetic field. The provision of a permitted range instead of a specific one level threshold results in an improved tamper-resistant system. Where in embodiments of the present invention it is stated that the upper limit and lower limit of the range are magnetically unipolar, reference is made to limit values corresponding to the same magnetic polarity, i.e. both a south pole or both a north pole. The range is therefore not a range centered around 0 Gauss and that includes both positive and negative magnetic field strengths.
    Comparing said output signal with said reference data may include, for a magnetic field detected in at least one direction, checking whether values for at least one direction of said detected magnetic field fall in said reference range, the reference range comprising an upper limit and a lower limit that be magnetically unipolar.
    It is an advantage of at least some embodiments that it is not possible to tamper with the system due to saturation with an external magnetic field. The provision of an allowable range instead of a specific one level threshold results in a system that is more resistant to tampering.
    Said reference data may have a reference range with an upper limit and a lower limit for more than 1 dimension, for example in 2 dimensions or in 3 dimensions, the upper limit and the lower limit being magnetically unipolar.
    Said control unit can be further adapted for dynamically adjusting said reference data to conditions of the detection system used. It is an advantage of embodiments of the present invention that the sensor can re-memorize its magnetic environment when requested. It is an advantage of embodiments of the present invention that the system can cope with variations. It is an advantage of embodiments of the present invention that a reference can be recorded upon activation of the sensor system, or for example at predetermined times, so that variations can be taken into account instead of the function being set at the factory. This advantageously results in a significantly reduced error rate of the system due to elimination of the dynamic tolerances (e.g. mechanical tolerances when closing the door / window over the entire service life).
    It is an advantage of embodiments of the present invention that an at least 2-dimensional magnetic field is measured in that the latter results in an improved tamper-resistant system. Mimicking an at least 2-dimensional magnetic field outside of a laboratory environment is very difficult, making it much more difficult for people to tamper with the system.
    The limit values of the reference range can be programmed by the user, at the factory or during use.
    It is an advantage of embodiments of the present invention that not only the average level can be set, but also that the limits of the range that determine the interval for deriving an incident can be set. The latter contributes to accurate detection.
    Said detection system for detecting said at least one-dimensional magnetic field can be a detection system for detecting an at least two-dimensional magnetic field.
    It is an advantage of embodiments of the present invention that the protection circuit comprises a detection system for detecting a magnetic field in three separate directions. It is practically impossible to simulate a three-dimensional magnetic field, so that a system is obtained that is tamper-proof for falsification with an external magnetic field.
    Said detection system for detecting said at least one-dimensional magnetic field can be a detection system for detecting a three-dimensional magnetic field.
    The detection system for detecting the magnetic field can have a gain control that compensates for the variation in magnetic remanence of a permanent magnet over temperature applied in the system.
    It is an advantage of embodiments of the present invention that a reduction in the range for detecting an event can be achieved, thereby enabling accurate detection.
    The detection system may comprise a single sensor for detecting a two or three-dimensional magnetic field.
    The sensor circuit may include a power unit configured to automatically activate magnetic measurement at programmable time intervals without the need for an external trigger before each measurement.
    It is an advantage of embodiments of the present invention that a reduced overall power consumption is obtained with the sensor circuit.
    The sensor circuit may further comprise an RF receiver, the system being configured to use a trigger of the RF receiver to magnetically detect the system to memorize the magnetic environment of the sensor circuit.
    The detection of a magnetic environment may include the detection of calibration data for the magnetic field induced by the environment of the sensor circuit.
    The trigger can be level based. The trigger can be edge based.
    The sensor circuit may comprise an RF transmitter, the system may be configured for transmission of a detection event by the one or more sensors of the detection system.
    The detection event can be based on level. The detection event can be edge based. The detection event can be representative of a broken circuit, e.g. through a window that has been opened, e.g. upon intrusion.
    The RF receiver and RF transmitter can be combined in a single RF transceiver.
    The RF receiver and RF transmitter can be combined with the one or more sensors.
    The magnetic sensor can be configured to measure a supply voltage and to send a control signal to indicate a low energy status of a local power source.
    It is an advantage of embodiments of the present invention that the system can be made autonomous and that it can send a message to a home base that the battery is weak and needs to be replaced.
    The sensor circuit may be configured to compare a detection signal of the detection system with a threshold digitally or in an analogous manner.
    The sensor circuit may include a circuit breaker, the output of the comparison being directly connected to the sensor circuit breaker.
    The present invention also relates to the use of a sensor circuit as defined above for security applications.
    The present invention also relates to the use of a sensor circuit as described above for home security applications.
    The present invention also relates to a method for detecting a circuit break, the method comprising inducing a permanent magnetic field, detecting said permanent magnetic field and providing an output signal representative of said permanent magnetic field, and the detecting an event by comparing said output signal with reference data, said comparison comprising comparing an output signal representative of values of the detected magnetic field in at least one direction with a reference range comprising an upper limit and a lower limit, the upper and lower limits are magnetically unipolar.
    Comparing said output signal with said reference data may include, for a detected magnetic field measured in at least one direction, checking whether values for at least one direction of said detected magnetic field fall within said reference range including an upper limit and a lower limit that are magnetic be unipolar.
    Comparing said output signal with said reference data may include, for a detected magnetic field that was measured in multiple directions, checking whether values from different directions of said detected magnetic field fall within said different reference regions for said different directions, said reference regions having an upper limit and have a lower limit that is magnetically unipolar.
    Said method may comprise dynamically adjusting said reference data to conditions of the detection system during use.
    The method may comprise dynamically adjusting the limit values of said one or more reference areas during detection, for example, during use of the system.
    The method may include detecting a two or three-dimensional magnetic field.
    The method may include automatically activating magnetic measurement to obtain calibration data for the influence of the environment on the magnetic field at programmable time intervals without the need for an external trigger.
    The method may include transmitting a detection event by the one or more sensors of the detection system.
    The method may include measuring a supply voltage and sending a voltage detection event signal to indicate a low energy status of a local supply source.
    Specific and preferred aspects of the invention are included in the accompanying independent and dependent claims. Features of the dependent claims can be combined with features of the independent claims and with features of other dependent claims as needed and not merely as explicitly set out in the claims.
    These and other aspects of the invention are clear and explained with reference to the embodiment (s) described below.
    BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a schematic overview of a safety switch as generally applicable. FIG. 2 illustrates a detection of an event by means of a conventional crossing of a threshold, as used in the prior art. FIG. 3 illustrates a detection scheme for a detection circuit as known from the prior art. FIG. 4 illustrates a detection circuit for a detection circuit using a reference range with unipolar boundaries according to an embodiment of the present invention. FIG. 5 illustrates a schematic representation of a characterizing system according to an embodiment of the present invention.
    The drawings are purely schematic and are non-limiting. In the drawings, the dimensions of some of the elements may be exaggerated and not drawn to scale for illustrative purposes.
    All reference characters in the claims may not be interpreted as limiting the objective.
    Detailed description of illustrative embodiments
    The present invention is described with respect to specific embodiments and with reference to certain drawings, but the invention is not limited thereto but only to the claims. Furthermore, the terms first, second, third and the like are used in the description and in the claims to distinguish between similar elements and not necessarily for describing a sequence, both temporarily and spatially or in any other way. It is understood that the terms thus used are interchangeable under appropriate conditions and that the embodiments of the invention described herein may also operate in sequences other than those described or illustrated herein.
    It should be stated the term "comprising", used in the claims, should not be interpreted as being limited to the means listed below; it does not exclude other elements or steps. It must therefore be interpreted as indicating the presence of the listed features, integers, steps or components referred to, but it does not exclude the presence or addition of one or more other features, integers, steps or components, or groups thereof from. The term "a device comprising means A and B" should therefore not be limited to devices consisting solely of components A and B. It means that with regard to the present invention, the only relevant components of the device are A and B .
    Reference throughout this specification to "a particular embodiment" or "an embodiment" means that a specific feature, structure, or feature described in connection with the embodiment is included in at least one embodiment of the present invention. The terms "in a particular embodiment" or "in an embodiment" at various places throughout this specification thus do not necessarily all refer to the same embodiment, but can. Furthermore, the specific features, structures, or features may be combined in any suitable manner, as is apparent to anyone skilled in the art of this disclosure, in one or more embodiments.
    Further, although embodiments described herein include some but no other features included in other embodiments, combinations of features of different embodiments are within the scope of the invention and form different embodiments, as is apparent to anyone skilled in the art in the field. For example, in the following claims, any of the claimed embodiments can be used in any combination.
    Various specific details are included in the description herein. However, it is clear that embodiments of the invention may be practiced without these specific details. In other instances, well-known methods, structures and techniques were not shown in detail in order not to complicate the understanding of this description.
    Where in embodiments of the present invention reference is made to an incident detection, reference is made to a change in magnetic field detected in the detection system. The latter can, for example, be caused by the movement of a certain component, e.g. opening or closing of a door, window, etc., the movement of a structural element, etc.
    In a first aspect, the present invention relates to a protection circuit for detecting a circuit change, e.g., a circuit break. According to embodiments of the present invention, the sensor circuit can, for example, be advantageously used for security monitoring, such as for home security monitoring such as detection of the opening or closing of doors, windows, etc., although embodiments are not limited thereto. According to embodiments of the present invention, the sensor circuit comprises a permanent magnetic field-generating element. Such a permanent magnetic field-generating element can, for example, be a permanent magnet, but alternatively it can also be, for example, an electromagnet to generate the magnetic field. The permanent magnetic field provides a magnetic field contribution in at least one direction. In some advantageous embodiments, the permanent magnetic field can also extend in a second direction or even in a second and third direction. In the latter case, reference is made to a two or three-dimensional magnetic field that has been generated, while in the first situation use can in principle be made of a one-dimensional magnetic field, i.e. a magnetic field extending substantially in one direction. This can be advantageously used in some embodiments of the present invention to increase tamper resistance of the system.
    According to embodiments of the present invention, the detection circuit also comprises a detection system. Such a system may comprise a single magnetic sensor or may comprise a combination of magnetic sensors. The one or more magnetic sensors are thus configured to measure / detect a magnetic field strength (of the magnetic field-generating element) in at least one direction. The detection system is further adapted to provide an output signal representative of said at least one-dimensional magnetic field. Regardless of the fact that a one-dimensional, two-dimensional or three-dimensional magnetic field is generated, the detection system can be adapted to measure the magnetic field or magnetic field variation in only one direction. In some embodiments, the detection system is adapted to detect the magnetic field or the magnetic field variation in two separate directions. In some embodiments, the detection system is adapted to detect the magnetic field or the magnetic field variation in three separate directions, e.g., to cover a three-dimensional space.
    Furthermore, according to embodiments of the present invention, the sensor circuit also comprises a control unit for detecting an event by comparing said output signal with reference data, said reference data comprising a reference range with an upper limit for at least one direction of said magnetic field and a lower limit, wherein the upper limit and lower limit are magnetically unipolar. As stated above, the expression means that the boundaries are magnetically unipolar in that they both have the same polarity, i.e., south or north. Because the output value is compared with a range, or, in other words, with an upper limit and a lower limit of a range, the system comprises a comparator with 2 levels. The latter can be incorporated in any suitable way, for example in software or in hardware. FIG. 5 is a schematic representation of a system according to a characterizing embodiment of the present invention. FIG. 5 illustrates a detection circuit comprising a magnetic field-generating element, a detection system comprising one or more magnetic sensors for detecting the magnetic field in at least one direction, and a control unit for evaluating an output signal of the detection system that is representative for the detected magnetic field in at least one direction by comparing it with a reference, wherein the reference comprises a range for the magnetic field in the at least one direction, and the range is defined by an upper and a lower limit corresponding to same magnetic polarity. Other features that may be present are transferring and / or receiving components for communication with external components of the security system. The sender and / or receiver may be included as a transceiver. In some embodiments, the transmitter and / or receiver may be included as part of the detection circuit, i.e., as part of the magnetic detection chip.
    By way of illustration, some features and some principles of embodiments of the present invention are further illustrated by some exemplary embodiments of the present invention, the present invention being limited thereto or thereby.
    In one exemplary embodiment, when, for example, an alarm system is activated, a function is called up whereby each sensor remembers its surrounding magnetic state, i.e. the Bx, By, Bz magnetic flux density components. Instead of setting this function in the factory to time t = 0, the system can process variations of eg closing a window, significantly reducing the error rate of the system by eliminating the dynamic tolerances (e.g. mechanical tolerances when closing the door / window many times).
    In one exemplary embodiment, comparison of the detection system's output value is performed by comparing it with 2 (top / bottom) limits for each axis instead of a threshold so that it is no longer possible to tamper with the system by saturating it with an external magnetic field. Thus, an "allowed area" is defined instead of an open-ended system that is not tamper-proof. The control unit may therefore preferably include a two-level comparator.
    In one characterizing embodiment, a 3D magnetic field is detected. This results in the fact that it is no longer possible to imitate the magnetic field from a magnetization source. ID field setting - ignoring the other 2 dimensions can in principle be set or simulated, leaving an open space to tamper with the system. But a 3D field setup without the use of laboratory equipment (and knowing that accurate field settings are only realistically possible with a 3D HelmHoltz coil, and only in the center of the equipment) is virtually impossible to implement.
    In a particular embodiment, systems according to embodiments of the present invention may also include a micro energy unit to provide the functionality whereby the sensor activates itself at regular programmable intervals, thereby reducing the total power consumption. This activation can be used, for example, to memorize the magnetic environment that is present at the time of activation, resulting in the system dynamically adjusting the safety switch to a changing environment that is not representative of an incident. Such effects can, for example, be caused by a door that no longer closes as well as before. This can be caused, for example, by temperature influences, weather influences, etc. Thus, according to at least some embodiments of the present invention, the sensor circuit can be dynamically adjusted.
    According to some embodiments of the present invention, the limit settings, e.g. for a magnetic field strength range in one direction, in two directions or in three directions, can be programmed by the customer, either at factory level or during operation when the external protection switch "memorizes" "state enters, ie memorizes the contribution of the environment to the magnetic field. It should be mentioned that, in general, the limits for ranges for different directions should not be the same or, in other words, be different.
    According to some embodiments of the present invention, the detection circuit may have a gain adjustment of the sensor that is inversely proportional to the reduction of magnetic remanence of the used permanent magnet, which is a reduction of the allowable measuring tape around the magnetic state, e.g., the 3D magnetic condition that was saved.
    In a particular embodiment, the design of the magnetic protection switch consists solely of an RF transceiver and a sensor. All functionalities can then be performed by the RF transceiver and the sensor. Communication between the 2 ICs can be, for example, as follows:
    A trigger TRG (level or edge based) is transmitted from the RF receiver to the magnetic sensor to enter memory mode, allowing the last state of the magnetic contribution from the environment to be memorized.
    A signal INT (level or edge based) is transmitted from the magnetic sensor to the RF transmitter to trigger the alarm (violation detected) when an event detection occurs.
    In yet another embodiment, the design of the magnetic protection switch includes the feature whereby the magnetic sensor also measures its supply voltage to transmit another message to the home port that the battery is weak and needs to be replaced. This can be done, for example, as follows: the ADC value of the voltage VDD / 2 is compared digitally or analogously to a threshold and the corresponding output of this check is directly connected to a circuit breaker.
    In a particular embodiment, memorizing the magnetic environment, ie, creating a magnetic memory representative of a relatively recent magnetic memory, can be performed on multiple occasions throughout the life of the product, on an occasion where the device is explicitly calibrated or at factory level, which means that a default value has been programmed. By performing the memorization on multiple occasions, a dynamic adjustment can be made to the environment.
    In a particular embodiment, the tolerances defined by the boundaries in the regions can be set independently for different directions, e.g. for an x, y, and z direction in which detection is performed. The latter can, for example, be influenced by the sensors used and their sensitivity in different directions, the fact that different sensitivities can be caused by different influences of magnetic contribution to the environment in different directions, etc.
    In a particular embodiment, the switching threshold can be provided with hysteresis to prevent scattering upon exposure to magnetic fields at the exact switching threshold.
    By way of illustration, to which embodiments of the present invention are not limited, a characterizing comparison is made between the situation in which an omnipolar boundary is used, as is known for prior art detection circuits, and the application of unipolar boundaries for a magnetic threshold, as used in embodiments of the present invention. This is shown in FIG. 3 (prior art) and in FIG. 4 (embodiments of the present invention).
    In FIG. 3 - there is a situation from the prior art in which, according to the prior art, a so-called omnipolar output is created, irrespective of whether the magnet is directed towards the sensor with its north or south pole. The sensor indicates an open status when the signal is in an area centered around OTesla and has a limit corresponding to the lower limit corresponding to an existing north pole, and a limit corresponding to a lower limit corresponding to an existing south pole. In all other situations, the sensor indicates that the system is in the closed state (either facing the south pole or the north pole of the magnet).
    When other magnetic fields are used to tamper with the system, this is not detected in a system according to this prior art.
    In FIG. 4 shows the situation where, according to embodiments of the present invention, detection is performed with reference to an area that is not centered at 0 Tesla, but that is set to a specific value that differs from 0. Further, the limits are of such a nature that the corresponding values are unipolar, ie have the same polarity. In this way, the sensor output can be used to detect a closed state and state in which the system is open or in which counterfeit can be detected. Furthermore, the reference can be dynamically set or set during calibration or during installation or during use.
    In one aspect, the present invention also relates to the use of a sensor circuit as described in the first aspect for security applications. In one aspect, the present invention further relates to the use of a sensor circuit for home security applications.
    In yet another aspect, the present invention relates to a safety system comprising a sensor circuit as described in the first aspect. Other features and benefits may be known to anyone skilled in the art. For example, the result of the evaluation of the output signal from the detection system can be transferred to a portion of the protection system outside the protection circuit and, depending on the output signal, can initiate an alarm procedure. Such a part of the security system may comprise an alarm signal generator, a separate processing means, an input / output device for switching the alarm on / off, a drive system for generating the alarm signal, etc. Some of these characteristics may also be included directly in the sensor circuit.
    In yet another aspect, the present invention relates to a method for detecting a circuit break, the method comprising inducing a permanent magnetic field, detecting said permanent magnetic field, and providing an output signal representative of said permanent magnetic field, and detecting an event by comparing said output signal with reference data, said comparing comprising comparing an output signal representative of values of the detected magnetic field in at least one direction with a reference area including an upper limit and a lower limit, the upper limit and lower limit being magnetically unipolar. Other method steps may be as described above or may correspond to the functionality of features of the detection circuit.
    权利要求:
    Claims (31)
    [1]
    Conclusions
    Sensor circuit for detecting a circuit change, e.g. circuit breakdown, the sensor circuit comprising - a permanent or electromagnet for generating a magnetic field - a detection system comprising one or more magnetic sensors configured to detect a magnetic field in at least one direction, and to provide an output signal representative of said detected magnetic field in the at least one direction, and - a control unit for detecting an incident by comparing said output signal with reference data, including said reference data for at least one direction of said magnetic field, a reference range with an upper limit and a lower limit, the upper limit and lower limit being magnetically unipolar.
    [2]
    Sensor circuit according to claim 1, wherein comparing said output signal with said reference data, for a magnetic field detected in at least one direction, includes checking whether values for at least one direction of said detected magnetic field fall within said reference range with a upper limit and a lower limit that are magnetically unipolar.
    [3]
    3. Sensor circuit as claimed in any of the foregoing claims, wherein said reference data for more than 1 direction, e.g. in 2 separate directions or in 3 separate directions, comprises a reference range with an upper limit and a lower limit, wherein the upper limit and lower limit are magnetically unipolar .
    [4]
    Sensor circuit according to any of the preceding claims, wherein said control unit is further adapted to dynamically adjust said reference data to conditions of the detection system used.
    [5]
    Sensor circuit according to the preceding claim, wherein the limit values of the reference range can be programmably set by the user, at the factory or during use.
    [6]
    Sensor circuit according to any of the preceding claims, wherein said detection system for detecting said at least one-dimensional magnetic field is a detection system for detecting an at least two-dimensional magnetic field.
    [7]
    Sensor circuit according to any of the preceding claims, wherein said detection system for detecting said at least one-dimensional magnetic field is a detection system for detecting a three-dimensional magnetic field.
    [8]
    Sensor circuit according to any of the preceding claims, wherein the magnetic field detection system has a gain control that compensates for the variation in magnetic remanence of a permanent magnet over temperature employed in the system.
    [9]
    Sensor circuit according to one of the preceding claims, wherein the detection system comprises a single sensor for detecting a two or three-dimensional magnetic field.
    [10]
    Sensor circuit according to any one of the preceding claims, wherein the sensor circuit comprises a power unit configured to automatically activate magnetic measurement at programmable time intervals without the need for an external trigger prior to each measurement.
    [11]
    Sensor circuit according to any of the preceding claims, the sensor circuit further comprising an RF receiver, the system being configured to use a trigger from the RF receiver to the magnetic detection system to memorize the magnetic environment of the sensor circuit .
    [12]
    Sensor circuit as claimed in any of the foregoing claims, the sensor circuit comprising an RF transmitter, the system being configured for transmission of a detection event by the one or more sensors of the detection system.
    [13]
    Sensor circuit according to claim 11 or 12, wherein the RF receiver and RF transmitter are combined in a single RF transceiver.
    [14]
    Sensor circuit according to claim 11 or 12, wherein the RF receiver and RF transmitter are combined with one of the sensor elements.
    [15]
    Sensor circuit according to any of the preceding claims, wherein the magnetic sensor is configured to measure a supply voltage and to send a control signal to indicate a low energy status of the local power source.
    [16]
    Sensor circuit according to one of the preceding claims, wherein the sensor circuit is configured for comparing a detection signal of the detection system with a threshold digitally or in an analogous manner.
    [17]
    Sensor circuit according to the preceding claim, the sensor circuit comprising a circuit breaker, the output of the comparison being directly connected to the sensor circuit breaker.
    [18]
    A sensor circuit according to any one of the preceding claims, wherein the permanent magnet or the electromagnetic magnet has a fixed position with respect to the one or more sensors, the sensor circuit further comprising a ferromagnetic target that changes the magnetic field detected by the sensor when the target moves.
    [19]
    19. - Use of a sensor circuit according to one of the preceding claims for security applications.
    [20]
    20. - Use of a sensor circuit according to one of claims 1 to 18 for home security applications.
    [21]
    21, a method for detecting a circuit break, the method comprising inducing a permanent magnetic field, detecting said permanent magnetic field and providing an output signal representative of said permanent magnetic field, and detecting an incident by comparing said output signal with reference data, said comparing comprising comparing an output signal representative of values of the detected magnetic field in at least one direction with a reference range having an upper limit and a lower limit, wherein the upper limit and lower limit are magnetically unipolar.
    [22]
    A method according to claim 21, wherein comparing said output signal with said reference data, for a detected magnetic field detected in at least one direction, comprises checking whether values for at least one direction of said detected magnetic field fall within said reference range with an upper limit and a lower limit that are magnetically unipolar.
    [23]
    The method of any one of claims 21 to 22, wherein comparing said output signal with said reference data, for a detected magnetic field detected in multiple directions, including checking whether values for different directions of said detected magnetic field within said different reference areas fall for said different directions, wherein said reference regions have an upper limit and a lower limit which are magnetically unipolar.
    [24]
    The method of any one of claims 21 to 23, wherein said method comprises dynamically adjusting said reference data according to conditions of the detection system used.
    [25]
    The method of claim 24, wherein the method comprises dynamically adjusting the limit values of said one or more reference areas during use.
    [26]
    The method of any one of claims 21 to 25, wherein the method comprises detecting a two or three-dimensional magnetic field.
    [27]
    The method of any one of claims 21 to 26, wherein the method comprises automatically activating a magnetic measurement to memorize the magnetic environment of the sensor circuit at programmable time intervals without the need for an external trigger.
    [28]
    The method of any one of claims 21 to 27, wherein the method comprises transmitting a detection event by the one or more sensors of the detection system.
    [29]
    The method of any of claims 21 to 28, wherein the method comprises measuring a supply voltage and sending a voltage detection event signal to indicate a low energy status of the local power source.
    [30]
    A security system comprising a sensor circuit according to any of claims 1 to 18.
    [31]
    The security system of claim 30, wherein the security system is a home security system.
    类似技术:
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    US7058538B2|2006-06-06|Method for determining the instant of reaching of the stroke end position in the deactivation phase of a movable element having shutter function forming part of a solenoid valve
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    同族专利:
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    CN106781144A|2017-05-31|
    CN106781144B|2020-07-10|
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    法律状态:
    2018-02-08| FG| Patent granted|Effective date: 20171108 |
    优先权:
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    US201562253953P| true| 2015-11-11|2015-11-11|
    US62253953|2015-11-11|
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