• 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 converter circuit for operating lighting means (LED) is provided, having a transformer (T) which has a primary-side coil (PS) which can be supplied from a supply voltage (Vbus) and which has a secondary-side coil (SS) , from which the lighting means (LED) can be supplied with a secondary-side voltage (Vsec), an auxiliary winding (HW) electromagnetically coupled to the primary-side coil (PS), a switch element (SE1) which is set up to selectively apply the supply voltage (Vbus ) to the primary-side coil (PS) of the transformer (T), and a measuring resistor (Rsh) connected to the switch element (SE1), which is connected to a measuring point (Vm5) on a higher potential side, whereby the auxiliary winding (HW) is connected via a resistor network (Rsnsv1, Rsnsv2) to the measuring point (Vm5) in such a way that a voltage at the measuring resistor (Rsh) can be combined with one at the Auxiliary winding generated further voltage.
    公开号:AT17184U1
    申请号:TGM168/2016U
    申请日:2016-07-07
    公开日:2021-08-15
    发明作者:
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    CONVERTER CIRCUIT FOR LIGHT SOURCES WITH ONE MEASURING POINT FOR DETERMINING COMBINED ELECTRICAL PARAMETERS
    The invention relates to a converter circuit in which a plurality of electrical measured variables and / or signals or electrical parameters reproducing them can be detected at a measuring point. The electrical parameters are preferably used to clock a clocked converter (in particular a flyback, boost and / or buck converter) for lighting means. The lighting means are, in particular, an LED path with at least one LED. The clocked converter is in particular part of the converter circuit.
    The converter circuit has a single measuring point at which the electrical parameters can be detected. The measuring point is linked on the one hand to a switch element of the clocked converter and on the other hand to a measuring winding which is electromagnetically coupled to at least one primary-side winding of a transformer of the clocked converter. The electrical measured variables are superimposed at the measuring point or are applied there, in particular over time, combined or individually. In this way, different electrical parameters can be combined or individually recorded at the measuring point at different times and preferably depending on an activation of the switch element.
    As a result, when the measuring point is connected to a control circuit, the number of input connections (pins) of the control circuit can be reduced or kept small.
    The control circuit can in particular be an IC, ASIC and / or microcontroller. Thus, a large number of electrical parameters can be recorded and evaluated by the control circuit via a single measuring point.
    At the measuring point, a bus voltage and preferably an input voltage of the clocked converter, a current through the switch element with a conductive switch element, in particular a closed switch or field effect or bipolar transistor, a secondary-side voltage of the clocked converter circuit with a non-conductive switch element, and / or a point in time at which a secondary-side diode is no longer conductive, or the current / voltage on the secondary side of the transformer exceeds or falls below a predetermined threshold value, in particular a zero crossing, can be detected.
    A converter circuit according to the independent claims is therefore provided. Developments of the invention are the subject of the dependent claims.
    In a first aspect, a converter circuit for the operation of lighting means is provided, comprising a transformer which has a primary-side coil which can be supplied from a supply voltage, and which has a secondary-side coil from which the lighting means with a secondary-side Voltage can be supplied, an auxiliary winding electromagnetically coupled to the primary-side coil, a switch element which is configured to selectively switch the supply voltage to the primary-side coil of the transformer, and a measuring resistor connected to the switch element, which is connected to a measuring point on a higher-potential side is, wherein the auxiliary winding is connected to the measuring point via a resistor network in such a way that a voltage at the measuring resistor can be combined with a further voltage generated at the auxiliary winding. The superimposed voltages can then be recorded at the measuring point. The transformer can separate a primary side of the converter circuit from a secondary side of the converter circuit with electrical isolation.
    The voltage across the measuring resistor at the measuring point (Vm5) can reflect a switch element current through the switch element. At the measuring point, the switch element current can be detected by the switch element, in particular if the switch element is switched to be conductive. The switch element current can be detected on the measuring resistor.
    At the measuring point, the supply voltage can be combined with the switch element
    current are detected, in particular when the switch element is switched on.
    A further voltage can be detected at the measuring point, in particular if the switch element is switched non-conductive, the further voltage preferably reproducing the secondary-side voltage of the secondary-side coil of the transformer. The secondary-side voltage of the secondary-side coil corresponds to the voltage that drops across the secondary-side coil, the secondary-side voltage preferably being provided for operating lighting means. The secondary-side voltage of the secondary-side coil thus preferably corresponds to the secondary-side voltage of the converter circuit, in particular the output voltage of the converter circuit.
    At the measuring point, and in particular by evaluating the further voltage, a point in time of the zero crossing of a secondary-side current through the secondary-side coil can be detected. In particular, a point in time can be detected at which a diode connected in the forward direction between the secondary-side coil and the lighting means is no longer conducting.
    The measuring resistor can be connected in series with the switch element. The measuring resistor can preferably be connected to a lower-potential side of the switch element.
    The measuring resistor can be connected to the auxiliary winding via a first voltage divider. The measuring resistor can in particular be connected in series with a first resistor and a second resistor of the first voltage divider. The measuring point can be connected at a midpoint between the first resistor and the second resistor of the first voltage divider.
    A further resistor can be connected between the switch element and the measuring resistor, which forms a second voltage divider with the measuring resistor.
    A lower potential side of the second resistor of the first voltage divider can be connected to a center point of the second voltage divider and in particular to the higher potential side of the measuring resistor.
    The converter circuit can also have a control circuit which can detect signals present at the measuring point.
    The control circuit can evaluate the measurement signal and determine electrical parameters that determine the supply voltage, in particular an input voltage of the converter circuit, the current through the switch element when the switch element is switched on, the secondary-side voltage of the converter circuit, in particular an output voltage of the converter circuit, when the switch element is non-conductive and / or reproduce the time of the zero crossing of the secondary-side current.
    A parameter of the control circuit which reproduces the supply voltage can be supplied from another part of the converter circuit, in particular from a PFC circuit.
    The control circuit can be an IC, ASIC and / or a microcontroller. The control circuit can only be connected to the measuring point with one input.
    The converter circuit can be a flyback circuit. The switch element can preferably be a switch of the flyback circuit.
    A current source can be connected to the midpoint of the first voltage divider.
    In a further aspect, an operating device with a converter circuit is provided which has a converter circuit as described herein.
    In a further aspect, a method for determining electrical parameters at a measuring point of a converter circuit for the operation of lighting means is provided, having a transformer which has a primary-side coil that starts out
    is supplied by a supply voltage, and which has a secondary-side coil, from which the lighting means are supplied with a secondary-side voltage, an auxiliary winding electromagnetically coupled to the primary-side coil,
    a switch element which selectively switches the supply voltage to the primary-side coil of the transformer, and
    - A measuring resistor connected to the switch element, which is connected to the measuring point on a higher potential side, wherein
    the auxiliary winding is connected to the measuring point via a resistor network in such a way that a voltage at the measuring resistor is combined with a further voltage generated at the auxiliary winding.
    The converter circuit can also have a control circuit that evaluates a measurement signal at the measuring point and determines electrical parameters that determine the supply voltage, in particular an input voltage of the converter circuit, the current through the switch element when the switch element is switched on, the secondary-side voltage of the converter circuit, in particular an output voltage of the converter circuit when the switch element is non-conductive and / or the time of the zero crossing of the secondary-side current.
    The invention will now also be described with a view to the figures. The figures show: FIG. 1 an exemplary circuit arrangement according to the invention, FIG. 2 a schematic flow diagram,
    FIG. 3 shows exemplary curve profiles which can be recorded at different taps of the exemplary circuit from FIG. 1 and at the measuring point,
    FIG. 4 shows an enlarged view of a section of the curve profiles from FIG. 3.
    The acquisition of the electrical parameters according to the invention will now be described with reference to FIG. Starting from a supply voltage Vbus, a transformer T, in particular a linear transformer, is supplied on its primary side. In particular, the primary-side coil PS is shown schematically. The primary-side coil PS is also connected to a ground potential via a series circuit of a switch element SE1 and a measuring resistor Rsh. The switch element can in particular be controlled by a control circuit S by means of a control signal outG.
    Also shown is a first tap Am1 between the switch element SE1 and the measuring resistor Rsh, at which a primary-side current Ipri can be detected by the switch element SE1 when the switch element SE1 is switched on. However, the taps shown below are essentially not used to record the electrical parameters by the control circuit S. The electrical variables recorded on them are used with a view to FIGS. 3 and 4 to explain the combined measurement signal Vsns determined at the single measurement point Vm5 and its evaluation, or for simulation purposes. In a real implemented converter circuit according to the invention, these taps are preferably not present.
    In addition, a further path can be provided in parallel to the series connection of the switch element SE1 and the measuring resistor Rsh. In this further path, for example, a voltage Vdspri across the switch element can be detected at a second tap Vm4, in particular a drain-source voltage of the switch element SE1 if the switch element SE1 is designed in particular as a semiconductor switch element, FET or MOSFET transistor.
    The illustrated first diode D1 connected in parallel to the switch element SE1 is in particular a so-called body diode of the switch element SE1.
    On the transformer T, a secondary-side coil SS is also provided, starting from which a load and / or a lighting means LED can be operated on a secondary side of the converter circuit with a secondary-side current Isec and / or a secondary-side voltage Vsec. On the secondary side of the circuit, a second diode D2 is initially provided, which is connected in series with the LED light source and is used for rectification.
    In addition, a smoothing or storage capacitor C40 can be provided parallel to the lighting means LED in order to ensure a continuous DC voltage supply to the lighting means LED. A third tap Vm1 is shown parallel to the lamp, which is used in particular to detect a lamp voltage VLED.
    At a fourth tap Am2 between the second diode D2 and the lighting means LED, the secondary-side current Isec can be detected.
    Furthermore, an auxiliary winding HW is provided on the transformer T, which is in particular electromagnetically coupled to the primary-side coil PS of the transformer T. While the auxiliary winding HW is connected on the one hand to the ground potential, on the other hand it is connected to the switch element SE1 and the measuring resistor Rsh via a resistor network with preferably two resistors, a first resistor Rsnsv1 and a second resistor Rsnsv2. A further resistor Rdson1 can also be provided between the switch element SE1 and the measuring resistor Rsh.
    The first resistor Rsnsv1 and the second resistor Rsnsv2 in turn form a first voltage divider. Starting from the auxiliary winding HW, the first resistor Rsnsv1 is connected in series with the second resistor RSNV2 and preferably with the measuring resistor Rsh. In particular, the further resistor Rdson1 and the measuring resistor Rsh form a second voltage divider, at the center point of which the series circuit of the first resistor Rsnsv1 and the second resistor Rsnsv2 is connected. The only measuring point Vm5 at which the combined measuring signal Vsns is recorded is connected to the center point of the first voltage divider. The measuring point Vm5 can be connected between the midpoint of the first voltage divider and the ground potential.
    FIG. 2 shows a sequence of a detection and evaluation of the combinational mixed signal, in the following measurement signal Vsns, at the one measurement point Vm5. Corresponding signal curves are shown in FIG. 3, the offset voltage Voffset preferably being determined by the current I_dce of an integrated current source (see FIG. 1) and the resistance “Rsnsv1 | | Rsnsv2 ", which is present due to a parallel connection of the first resistor Rsnsv1 and the second resistor Rsnsv2 resulting during the control of the switch element SE1 (Voffset = I_dc: (Rsnsv1 | | Rsnsv2)).
    In a phase in which the switch element SE1 is closed or switched on (step S1, control signal outG high), a first electrical parameter Vbus' reproducing the supply voltage Vbus is detected at the single measuring point Vm5 (step S2) initially reproduces an (offset) voltage value at the time the switch element SE1 is switched on.
    In other words, in a phase in which the switch element SE1 is closed or switched on, the voltage level of the voltage Vsns measured at the measuring point Vm5 (as a measuring signal) provides a first electrical parameter Vbus' which reproduces the supply voltage Vbus. In this case, the voltage level of the voltage Vsns before or at the time when the switch element SE1 is switched on initially corresponds to the offset voltage Voffset.
    On the basis of this recorded value of the first electrical parameter Vbus', a level of the measurement signal Vsns that increases essentially linearly with the increasing switch current Ipri can then be detected by sampling the signal profile of the measurement signal Vsns at the measurement point Vm5 (step S3). A second electrical parameter Ipri, which reproduces the switch current Ipri on the primary side, can therefore be determined from the measurement signal Vsns.
    When the switch current Ipri, or the second electrical parameter Ipri 'reproducing it (i.e. an increment in addition to the signal contribution of the supply voltage Vbus) reaches a predetermined threshold value SW (step S4, path J), the switch element SE1 is opened (step S5) or switched non-conductive. Otherwise (step S4, path N), scanning is continued (step S3). The non-conductive switching of the switch element SE1 takes place preferably
    wise by control starting from the control circuit S with the control signal outG (control signal outG low). In particular, the control signal outG is no longer output to the switch element SE1 in this case.
    It is then in a time-separated phase that begins with the opening of the switch element SE1, a further signal Vsec 'detected as the measurement signal Vsns at the single measurement point Vm5, which reproduces the secondary-side freewheeling of the secondary-side current Isec and the secondary-side voltage Vsec . The measurement signal Vsns now has an essentially constant level over a period of time during which the secondary-side diode D2 is conductive, which level is lower than the signal level of the measurement signal Vsns during the detection of the supply voltage Vbus or the signal Vbus' reproducing it.
    In other words, in a further (temporally separated) phase that begins with the opening of the switch element SE1, the voltage level of the voltage Vsns measured at the measuring point Vm5 (as a measurement signal) provides an electrical parameter Vsec ’which reflects the secondary-side voltage Vsec. The electrical parameter Vsec 'also allows a conclusion about a secondary-side current flow Isec. The voltage level of the voltage Vsns that provides the parameter Vsec 'is smaller than the voltage level of the voltage Vsns that provides the parameter Vbus'.
    While the second diode D2 on the secondary side of the converter circuit is conductive, the secondary-side current Isec drops continuously. At the point in time at which the secondary-side diode D2 is or becomes no longer conductive, the signal level of the measurement signal Vsns (voltage level of the measurement voltage Vsns) at the single measurement point Vm5 jumps back to the level of the measurement signal Vsns before the first electrical parameter Vbus' was recorded ( commutation has taken place), ie the voltage level of the voltage Vsns corresponds again to the offset voltage Voffset.
    The voltage jump ZX 'at the single measuring point Vm5 (from the voltage level providing the parameter Vsec' to the voltage level corresponding to the offset voltage Voffset) can thus also be detected and reflects the time of the zero crossing ZX of the secondary-side current Isec. In particular, when the converter circuit is operated in what is known as the borderline mode, reaching the zero point ZX of the secondary-side current can thus define the switch-on point for the switch element SE1 (step S7, path J).
    Accordingly, according to the invention, by measuring the voltage Vsns at the measuring point Vm5, the detection of the bus voltage Vbus can be combined with the detection of the switch current Ipri when the switch element SE1 is conductive. By measuring the voltage Vsns at the single measuring point Vm5, it is also possible to detect the switch current Ipri and, in a subsequent phase (which begins with the opening of the switch element SE1), the detection of the secondary-side voltage Vsec and the detection of the point in time of the zero crossing ZX of the secondary-side Electricity possible. The parameters Ipri ', Vsec', Vbus 'and / or ZX' which reflect the respective electrical variable are preferably recorded.
    The circuit according to the invention thus shows the possibility of measuring a voltage at the measuring resistor Rsh, which is combined with the voltage generated at the auxiliary winding HW. From this combination, by measuring the voltage Vsns at the single measuring point Vm5, all of the four parameters mentioned at the beginning (supply voltage Vbus (input voltage of the converter circuit), current Ipri through the switch when the switch is closed, the secondary-side voltage Vsec of the converter circuit when the switch is open, can be obtained as desired (Output voltage of the converter circuit) and / or time of the zero crossing ZX of the secondary-side current).
    If necessary, the information regarding the bus voltage Vbus can already be supplied from other areas of the converter circuit or be known (for example, it can be the output voltage of an upstream power factor correction circuit). In this case it is not necessary that all four parameters are actually applied to the single measurement
    point are detectable.
    It should be understood that the detection, evaluation, sampling and / or determination of the electrical parameters is preferably carried out by the control circuit S.
    With reference to FIG. 4, it will now be explained how the detection takes place in more detail. If the switch element SE1 is conductive, that is to say switched on, the current flows through the primary coil PS of the transformer T depending on the input voltage or supply voltage Vbus, the switch-on time of the switch element and the inductance.
    In Fig. 4, the switch-on time and duration of the switch element SE1 are shown by the course of the control signal outG. When the switch element is switched off, that is to say switched to non-conductive mode, the energy stored in the primary coil PS is transferred to the secondary side. During this time the voltage on the secondary side rises and the capacitor C40 is charged, the second diode D2 conducts.
    Once the energy has been transferred to the secondary side, the secondary-side current Isec drops to zero until the second diode D2 no longer conducts and a new switching cycle begins. This point in time can be detected on the basis of a resulting change in the voltage Vsec 'on the auxiliary winding HW (sense winding).
    The measurement signal Vsns can be provided with an offset by means of an integrated current source | _dc (cf. FIG. 1) or a so-called pull-up resistor, so that a suitable measured variable can be set at the measurement point Vm5.
    Finally, at the bottom of FIG. 4, a section of the measurement signal Vsns is shown again enlarged, which illustrates the combination of the signal detected at the measurement point Vm5, in particular the contribution from Ipri. In particular, this is contained in the combined signal Vsns due to an additional contribution and rise of the signal indicating the bus voltage.
    The signal processing then takes place on the part of the control circuit S, for example in such a way that the signal Vsns is detected immediately after switching to the higher signal level and is then scanned immediately.
    权利要求:
    Claims (10)
    [1]
    1. Converter circuit for operating light sources (LED), comprising - a transformer (T) which has a primary-side coil (PS) which can be supplied from a supply voltage (Vbus) and which has a secondary-side coil (SS), from which the lighting means (LED) can be supplied with a secondary-side voltage (Vsec), - an auxiliary winding (HW) electromagnetically coupled to the primary-side coil (PS), - a switch element (SE1) which is set up to selectively switch the supply voltage ( Vbus) to the primary-side coil (PS) of the transformer (T), and - a measuring resistor (Rsh) connected to the switch element (SE1), which is connected to a measuring point (Vm5) on a higher potential side, whereby the auxiliary winding ( HW) is connected to the measuring point (Vm5) via a resistor network (Rsnsv1, Rsnsv2) in such a way that a voltage on the measuring resistor (Rsh) can be combined with an ore on the auxiliary winding anticipated further tension.
    [2]
    2. Converter circuit according to claim 1, wherein the voltage across the measuring resistor (Rsh) at the measuring point (Vm5) reproduces a switch element current (lpri) through the switch element (SE1), in particular when the switch element (SE1) is turned on.
    [3]
    3. Converter circuit according to claim 1 or 2, wherein the supply voltage (Vbus) combined with the switch element current (lpri) can be detected at the measuring point (Vm5), in particular when the switch element (SE1) is switched on.
    [4]
    4. Converter circuit according to one of the preceding claims, wherein a further voltage can be detected at the measuring point (Vm5), in particular if the switch element is switched non-conductive, the further voltage preferably reproducing the secondary-side voltage (Vsec) of the secondary-side coil (SS).
    [5]
    5. Converter circuit according to one of the preceding claims, wherein at the measuring point (Vm5), and in particular by evaluating the further voltage, the point in time of the zero crossing (ZX) of a secondary-side current (Isec) through the secondary-side coil (SS) can be detected, and in particular a point in time at which a diode (D2) connected in the forward direction between the secondary-side coil (SS) and the lighting means (LED) no longer conducts.
    [6]
    6. Converter circuit according to one of the preceding claims, wherein the measuring resistor (Rsh) is connected in series with the switch element (SE1) and preferably with its lower potential side.
    [7]
    7. Converter circuit according to one of the preceding claims, wherein the measuring resistor (Rsh) is connected to the auxiliary winding (HW) via a first voltage divider (Rsnsv1, Rsnsv2), and in particular in series with a first resistor (Rsnsv1) and a second resistor (Rsnsv2 ) of the first voltage divider (Rsnsv1, Rsnsv2), and wherein the measuring point (Vm5) is connected at a midpoint between the first resistor (Rsnsv1) and the second resistor (Rsnsv2) of the first voltage divider (Rsnsv1, Rsnsv2).
    [8]
    8. Operating device with a converter circuit according to one of the preceding claims.
    [9]
    9. A method for determining electrical parameters at a measuring point of a converter circuit for the operation of lighting means (LED), comprising - a transformer (T) which has a primary-side coil (PS) which is supplied from a supply voltage (Vbus), and which has a secondary-side coil (SS) from which the lighting means (LED) are supplied with a secondary-side voltage (Vsec), - an auxiliary winding (HW) electromagnetically coupled to the primary-side coil (PS), - a switch element (SE1) that selectively applies the supply voltage (Vbus) to the primary
    side coil (PS) of the transformer (T) switches, and
    - A measuring resistor (Rsh) connected to the switch element (SE1), which is connected to the measuring point (Vm5) on a higher potential side, the auxiliary winding (HW) being connected to the measuring point (Vm5) via a resistor network (Rsnsv1, Rsnsv2) is that a voltage on the measuring resistor is combined with a further voltage generated on the auxiliary winding superimposed.
    [10]
    10. The method according to claim 9, wherein the converter circuit further comprises a control circuit which evaluates a measurement signal (Vsns) at the measurement point (Vm5) and determines electrical parameters (Vbus ', Ipri', Vsec ', ZX') which determine the supply voltage ( Vbus), in particular an input voltage of the converter circuit, the current (lpri) through the switch element (SE1) when the switch element (SE1) is switched on, the secondary-side voltage (Vsec) of the converter circuit when the switch element (SE 1) is non-conductive and / or the time of Show the zero crossing (ZX) of the secondary-side current (Isec).
    In addition 4 sheets of drawings
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    同族专利:
    公开号 | 公开日
    DE102016208183A1|2017-11-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2490542A|2011-05-06|2012-11-07|Texas Instr Cork Ltd|Sensing arrangement for estimating the output voltage of an isolated flyback converter|
    US20140071714A1|2012-09-11|2014-03-13|Chengdu Monolithic Power Systems Co., Ltd.|Switch mode power supply, control circuit and associated control method|
    DE102014001359A1|2013-02-01|2014-08-07|Infineon Technologies Austria Ag|WALKER WITH GALVANIC INSULATION|
    DE102013207718A1|2013-04-26|2014-10-30|Tridonic Gmbh & Co Kg|Operating circuit for LEDs|
    GB2476605B|2008-10-22|2014-02-05|Tridonic Gmbh & Co Kg|Circuit for the operation of at least one LED|
    CN103401429B|2013-08-09|2015-08-26|杭州茂力半导体技术有限公司|A kind of Switching Power Supply and control circuit thereof and control method|DE102020203531A1|2020-03-19|2021-09-23|Osram Gmbh|CIRCUIT ARRANGEMENT FOR OPERATING A LOAD HAVING LIGHT SOURCES|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016208183.7A|DE102016208183A1|2016-05-12|2016-05-12|Converter circuit for lamps with a measuring point for the detection of combined electrical parameters|
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