• 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:
    The invention relates to the field of electrical engineering and can be used as a power source, to which high demands are made on the amount of power delivered and protection against short circuits. The purpose of the invention is to increase efficiency and reliability. The device consists of n series-connected sources of medium voltage 1. Each source of average voltage at the output is shunted by an idle current diode 13. The output circuit of each source includes a switching element 2, which is turned on and off by a control signal from the switching control unit 3. The control signals are generated using a detector 4 of current limits, a output current measurement device 5, and a control unit 3. As a result of control, the number of average voltage sources is connected to the output pins 9.10, so that the total output voltage is maximum CO / 2 8 W.
    公开号:SU1351525A3
    申请号:SU843786913
    申请日:1984-09-06
    公开日:1987-11-07
    发明作者:Шминке Вольфрам
    申请人:Ббц Аг Браун,Бовери Унд Ко (Фирма)；
    IPC主号:
    专利说明:

    but it was approaching a predetermined voltage value. At the same time, some of the sources of average value are made with the same output voltage. The other part of these sources has an output voltage equal to 1/2 of the average voltage, where m
    The invention relates to electrical engineering and can be used as a power source to which high demands are made in terms of power output and protection against short circuits.
    The purpose of the invention is to increase efficiency and reliability.
    Figure 1 is a schematic diagram of a high voltage source; Fig. 2 shows a preferred embodiment of the medium voltage source; FIG. 3 is a schematic diagram of a high-voltage source with additional control and regulation of the output voltage; 4, an example of the potential isolation of potential isolation (isolation) in a current-emitting device; Fig. 5 illustrates the process of controlling and regulating in time in the form of a curve Uo (t), where U (, is the output voltage.
    The high voltage source (Fig. 1) consists of n medium voltage sources 1, at the outlets of which the average voltage and, respectively, appear. .., Uj ,. Further, under the term average voltage, there are voltages of several hundred volts and up to several kilovolts. The sources of average voltage are connected in series so that the output voltage Ug is equal to the sum of all average voltages when all sources of average voltage are turned on. Each of the medium voltage sources 1 contains at least one switching element 2, which is turned on inside the source so that when it is opened, there is no current at the source output
     1, 2, 3, ... This contributes to an increase in the power delivered to the load. The introduction of diodes 13 eliminates the drop in the total output voltage on any switching element when it is opened. 1 hp ff, 5 ill.
    The switching elements 2 through the corresponding control lines, which, due to the separation of the potentials between the power unit and the control unit, are preferably performed as optical fibers, are connected to the unit
    3 switching control, the input of which is connected to the detector output
    4th boundary value, the input connected to the device 5 measurement
    current included in the circuit 6 load. High-voltage sources through two output wires 7 and 8 are connected to output pins 9 and 1p. The output terminals 11 and 12 of each source 1 of the medium voltage are connected by the idling diode 13 switched in the reverse polarity.
    Medium Voltage Source
    0 (FIG. 2) consists of a bridge overhead - mitel 14, the entrance of which is connected to the supply network 15 through a network
    a transformer (not shown. The output of the rectifier is connected to E) Iltra from Drossel 16 and capacitor 17.
    Using output wires 18. and 19 reduced dc voltage applied to output terminals 11 and
    30 12. In the output wire 19, a thyristor 20 is included as a switching element, the control input of which is connected to the starting unit 21. Each medium voltage source is provided with an additional monitoring device tuned to a separate source, consisting of a current value included in the output wire 18 of the current measurement device 22 and an additional Q 23 limit value detector connected between the output of the current measurement device 22 and the I / O. house block 21 run.
    35
    The device according to FIG. 3 is characterized by connecting medium voltage sources 1 to the mains through a transformer 24 with dividing secondary windings, each of which sources is connected to a corresponding secondary winding. The rectifying and smoothing functions of these sources are symbolically indicated by a diode 25 and a capacitor 26. Transformer 24 can be single-phase or three-phase. In addition, an additional control logic 27 and a voltage measurement device 28 are introduced into the device.
    For a direct connection between the current measurement device 5 and the control logic 27, a potential isolation is necessary, which preferably takes place inside the current measurement device 5 of FIG. 4. This isolation is carried out as follows. The load current 1c flows through the magnetic katupkah 29, which in the extreme case may consist of a straight wire. The magnetic field of the coil 29 affects the Hall element 30, which is powered by a stable direct current from the power source (Fig. 4, not shown). The voltage of the Hall voltage depending on the magnetic field is supplied to the converter analog - digit 31, which from the voltage of the Hall makes a digital signal proportional to the load current 1 and transmits it for comparison with the specified limit value to the control logic 27. In the same way, potential isolation (isolation) inside voltage measurement device 28 can be made if the voltage to be measured is first converted into an appropriate current with a precision resistor. I.
    High voltage power supply
    works as follows.
    When part of medium voltage sources 1 is disconnected due to the installation of diodes 13 of idling, the load current at a correspondingly reduced output voltage U can flow unimpeded through the no-load diodes of the disconnected sources, and open switching elements will be under voltage
    more than the average voltage of the corresponding medium voltage source. So, if, for example, the switching element 2 of the first medium-voltage source 1 is open, with the switching elements of the other sources closed, the output voltage U decreases by
    0 average stress Uj. A correspondingly reduced load current flows through the no-load diode 13 of the first source. All diodes are 13 other sources of medium voltage
    5 are under the reverse blocking voltage of their sources through which the load current flows. Since the diode 13 of the first source of the average voltage {works in the mode
    0 transmission, then at the outputs 11, 12 of this source there will be a potential difference equal to the voltage drop across the indicated diode, which is negligible compared to
    5 with medium voltage U ,. Therefore, on the open I-taty element 2, only the voltage that is produced by the first source decreases.
    1 average voltage and equal to. Average voltage value U, „
    In the absence of no-load diodes, load current 1 when one of the switching elements is opened
    2 would be completely interrupted, and then an open output voltage U, would appear on the open switching element. The limit value detector 4 triggers a trip command to the switching control unit 3,
    0 which converts it to the corresponding control commands on the individual switching elements 2. These control commands are in a time interval that is less
    5 or equal to the required tripping time. In cases where a given fall in the load current Ij is necessary, the control commands can also be shifted with a time shift in order to
    Q load current 1 is reduced by the corresponding steps.
    It is advisable to make the sources of average voltage identical, giving the output the same average
    voltage U ,. Then the output voltage Ug with n sources is equal to
    Uo um / n.
    The medium voltage source of FIG. 2 operates as follows.
    The alternating three-phase voltage of the network 15 is rectified by a rectifier 14.
    The smoothed voltage is applied via drossel 16 and capacitor 17 to output 11, 12. In output wire 19, the thyristor 20 that is turned off is included in the polarity pass signal, to the control input of which control pulses are fed from the start unit 21. These control pulses are generated by block 3 (Fig. 1). The load current I is monitored by a current measurement device 5 (Fig. 1) and a limit value detector A. Since this load current control specifies the boundary value and does not take into account individual requirements for each of the average voltage sources, each source has an additional monitoring device configured for a specific source, including a current measurement device 22 and a limit value detector 21 (FIG. 2). Therefore, the thyristor 20 can be disconnected both at the command of the main control unit 3 and from the local limit value detector 23.
    Since the load current flows through each of the medium voltage sources, the switching current element of which is closed, in the current measurement devices 5 and 20, in the normal case, the same current changes. The combination of the central control with local control of the current in the individual Sources is a double fuse, and due to the local control of the current, short circuits occurring prior to the current measurement device 5 are eliminated. In the absence of a current measurement device 5, the current closure is integrated in each source 1. However, in this case, to achieve the shortest total disconnection time of the high-voltage power source, a narrow tolerance is required to disconnect various medium voltage sources.
    The output voltage is controlled as follows.
    Since medium voltage sources are designed to
    individual connection and disconnection, then by combining different average voltages with appropriate control, different levels of output voltage U can be obtained. If all sources of average voltage produce the same mean value of voltage, then by alternately connecting individual sources, a step output voltage from UJ, to pn, can be obtained. The deviation of the actual value of the output voltage and of the set value Uy can in this case be limited to a maximum value. This maximum deviation can be reduced if most sources of average voltage have one
    The new value of U, and the voltages of the other sources of the average voltage in the steps, have a lower average voltage equal to, and t 1, 2, 3, ...
    The output voltage is controlled by the control logic 27 (Fig. 3), the inputs of which receive a signal from the limit value detector 4, a signal corresponding to a predetermined voltage value Ug, and a signal from the output voltage measurement device 28. The control logic 27 divides the value of a given voltage U by the average voltage U and determines the required number of sources of average voltage that must be turned on in order to maximally approximate the value of and to
    .
    If, on top of this, there are medium voltage sources with binary decreasing average voltages, then the logic control circuit 27 on the amount remaining after dividing the balance additionally includes a part of stepwise voltage decreasing sources, which in the appropriate combination further reduces the output voltage deviation and from a given Ug. The result from the control logic 27 in binary form is transmitted to block 3, from where the corresponding control commands along control lines fall on the switching elements 2.
    The control functions, depending on the set voltage U within the control logic circuit 27 with a priority, are preceded by the current protection function. The shutdown command from the limit value detector 4 interrupts the control process and, in the form of a shutdown command for all sources of average voltage, is transmitted to block 3. To ensure that after such an emergency shutdown, after a predetermined time, the output voltage U, has reappeared, inside logic circuit 27 a time sensor that starts switching on again the sources of average voltage according to a predetermined voltage U.- after expiration
    a certain time
    By means of a voltage measurement device 28, the actual output voltage U, is continuously measured. The result of each measurement is given to the corresponding input of the control logic 27 which compares U and Ug and forms the difference of both quantities. From the modulus and sign of this difference, it determines which and how many sources of mean voltage should be turned on or off, and, in addition, by dividing the type described above in order to minimize the deviation U from
    sLogical control circuit 27
    Preferably formed by one silt by several microprocessors, which perform the calculation steps necessary for controlling the regulation and make an appropriate choice of medium voltage sources. In this case, you can also reject the separate detector 4 of the limit value if the load current measurement data I the digital form is applied to the control logic 27 and there is also compared with the digital and stored limit value for the load current 1 (.
    For a direct connection between the current measuring device 5 and the control logic 27, a potential isolation is necessary, which is preferably carried out
    five
    inside the current measurement device 5 according to the scheme of FIG. 4.
    The process of control and regulation in time is reproduced in the form of a curve (Fig. 5). The dash-dotted curve of the given voltage Uj. shows the voltage course, which in the ideal case would have 0 and the output voltage U, the linear increase of U between the moments and the moment ti is carried out by the series connection of the sources of the average voltage by the steps U. So at the moment t, turns into
     - &
    the horizontal straight line, which approximately exceeds the last switched on value of the U stage, starting from the moment t, no longer connects sources with full average voltage U, but only a source with a decreasing binary voltage.
    At time tj, oscillation begins
    5 load, which is expressed by a decrease in the load resistance and a decrease in the output voltage U. By the time t 4, UQ is so reduced that the logic control circuit for
    0 eliminate the difference between U and U. produces the addition of a medium voltage source. The medium voltage source with the output voltage is turned off, and the other source of the average voltage
    0
    five
    0
    for sure. Us - and.
    five
    0
    five
    and connects.
    I
    As a result, the output voltage
    Ug is increased by and „/ 2, which is enough to reduce the difference to zero. If the output voltage Uj falls further, then at the moment t-logic control circuit turns on the source of the average voltage again so that U and Ug reconnect again. The adjustment in FIG. 5 is subject to large fluctuations, because in this image, for the sake of accuracy, only one stage of average voltage with a binary-reduced voltage exists. Accordingly, smooth control and regulation is obtained if inside the high-voltage source there are many sources of average voltage with binary-killing voltage values, IMA, and / 16, ...
    权利要求:
    Claims (2)
    [1]
    Invention Formula
    1, A high-voltage direct current power supply with current protection, containing a high voltage source, one output of which is connected to output terminals via a first switch for quickly disconnecting the load current, and the other through a device for measuring the load current, and its input is connected to the output of the load current measuring device, and the output is connected to the control input of the second switch, the output of which is connected to the control switch of the first switch, characterized in that with the goal. increase efficiency and reliability, the high voltage source is made in the form of several sources of average voltage, and the first switch to quickly disconnect the load current is made in the form of thyristors, each of which is included in the output circuit of the corresponding medium source
    sixteen
    R -. In ooogl. h
    / 7
    voltage, moreover, the conclusions of the sources of medium voltage are interconnected sequentially through
    additionally introduced idle diodes, each of which is connected in the opposite direction parallel to the output of the corresponding mean voltage source, one part
    medium voltage sources are made with the same output voltage, and the other with an output voltage of 1/2 of the average voltage, where m 1,2, ...
    [2]
    2. The power source according to claim 1, i.e., also with the fact that each medium voltage source is additionally equipped with its own current measurement device included in one of its output circuits, which through a series circuit of the additionally introduced own boundary value detector and control unit is connected to the control electrode of the thyristor, included in its other output circuit.
    -
    22
    //
    f /
    /
    fS
    fZ
    --AE
    {i.
     and „12
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    同族专利:
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    法律状态:
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