• 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:
    Overload protection circuitry for an electric motor (4) driving circuit (3) has a first current detection arrangement (r4, 10h, 10i, 10l) for detecting a maximum permissible current flowing to the driving circuit (3). The circuitry is such that when a maximum permissible current is detected current delivery operation of the driving circuit (3) is terminated (for example through comparator 10i, flip-flop 10l closing AND gates 94g to 94l to turn off current delivery transistors Q1 to Q6). The circuitry also has a second current detection arrangement (r1, r2, r3, 10a, 10d) for detecting a preselected overcurrent value flowing from the drving circuit (3). The circuitry is such that when the preselected overcurrent value is detected current delivery from the driving circuit is limited (for example through comparator 10a, resetting flip-flops 93a, 93b and through AND gates 94a, 94b to turn off current delivery transistors Q1 and Q2 which are then repeatedly turned back on and off by pulse generator 96, setting flip-flops 93a, 93b to pass a limited current). …<??>The result is that when a momentary surge of input current to the driving circuit occurs the driving circuit is closed down to prevent damage. When the motor (4) is overloaded, however, current continues to pass to the motor (4) but is limited so as not to cause damage.
    公开号:SU1450765A3
    申请号:SU792838857
    申请日:1979-11-02
    公开日:1989-01-07
    发明作者:Кавада Сигеки；Исида Хироси；Сакамото Кейдзи
    申请人:Фудзицу Фанук Лимитед (Фирма)；
    IPC主号:
    专利说明:


    Sl
    The invention relates to electrical engineering, in particular to the management and protection of AC drives.
    The purpose of the invention is to prevent the inverter from breaking out of the transistors due to overload and preventing the motor from stopping due to an overcurrent.
    The drawing shows a block diagram of an AC drive with overcurrent protection device.
    The electric drive contains an asynchronous motor I, connected to a transistor inverter 2, the DC circuit of which is connected to a DC source 3. The outputs of the current sensors 4-6 in the JQ capacitances of the electric motor are connected to the comparison unit 7, the second input of which is connected to the first current setting unit 8, and the output of the comparison unit 7 is connected to the control unit 9 by 25 inverter 2, the second inputs of which connected to the distributor 10 pulses. Comparison unit 7 contains three comparators 11-13 and three matching amplifiers 14-16. The inverter control unit 9 contains a generator of 17 pulses, a NOT 18-20 cell, OR 21-26 cells, triggers 27-32, first And 33-38 cells, and amplifiers 39-44, whose outputs are connected to transistor control units inverter 2. The inputs of the comparators 11-13 are connected to the outputs of the matching amplifiers 14-16, the inputs of which serve as the inputs of the comparison unit 7 connected to the sensors 4-6, and the second inputs of the first three comparators 11-13 are connected to the first block 8 of the current setting .
    The first inputs of cells OR 22, 24, and 26 are connected through cells NOT 18–20, and the inputs of cells OR 21, 23, and 25, are connected directly to the signals of the distributor of 10 pulses, and the second inputs - with the generator 17. Pulses. The outputs of the cells OR 21-26 connected to the first inputs of the triggers 27-32. The second inputs of the first and second, third and fourth, fifth and sixth triggers 27-32 respectively connected to the outputs
    45
    50
    55
    first and second and third P-13 comparators. The outputs of the triggers are connected to the first inputs of the first six cells And 33-38, the second inputs
    0
    c Q 5 p
    five
    0
    five
    which are connected to the outputs of the distributor 1 O pulses, and the outputs of the cells AND 33-38 are connected to the inputs of the amplifiers 39-44 of the inverter control unit 9.
    Additionally, a current sensor 45 may be introduced into the power supply circuit of the inverter 2, in addition, a second current setting unit 46, a fourth comparator 47, switching circuits 48, and a fourth matching amplifier 49 are used, and six second AND cells are introduced into the inverter control unit 50-55, wherein the first input of the fourth comparator 47 is connected to the current sensor 45 through the fourth matching amplifier 49, and the second input is connected to the second, current setting unit 46, and the output through the switching circuit 48 is connected to the first inputs of the second cells And 50-55 second entrances coto They are connected to the outputs of the six first cells AND 33-39, and the outputs of the latter are connected to the amplifiers 39-44 of the inverter control unit 9. The motor 1 is equipped with a tachogenerator 56.
    The drive works as follows.
    Square pulses are received by the inverter control unit 9 from the corresponding phase outputs U, V, W of the distributor 1 O pulses.
    The operation of the actuator is limited to the phase and. The first trigger 27 is transferred at the transition of a rectangular pulse for this phase to a logical O with sending an appropriate signal through the OR cell 21. Consequently, the output of the trigger 27 goes to logical I with a high level signal applied to the first input terminal of the first cell AND 33, opening it. When the rectangular pulse is reversed, the corresponding signal 1 passes through the open cell AND 33 and is applied to the amplifier 39, which amplifies the signal and guides it to the corresponding power transistor of the inverter 2 to turn it off. When a rectangular pulse goes back to a logical one, the first cell of AND 33 generates an output signal of a logical O, causing the power transistor to go off.
    The circuit containing the amplifier 40 has a NOT 18 cell connected between the input side and the phase line and, and therefore generates an output signal with a delay of 180 ° relative to the output signal of the amplifier 39. Therefore, when one power transistor is turned on, the other power transistor is turned off, and vice versa.
    The described operation also takes place in other phases, when the cycles of alternately turning on and off of the other power transistors are repeated. As a result of switching these power transistors, three-phase voltage pulses are generated to drive the motor 1. During normal operation of the motor, current i flows, for example, through the phase line and.
    When an overcurrent is generated in the line and the voltage inverter 2 on the sensor (current resistor 4), a significant voltage is developed. The output signal of comparator 11 should go to logical 1 when the voltage exceeds the value specified by the first block in the overcurrent setting. Signal 1 provides a reset for trigger 27 and trigger 28 with the resultant unlocking of And 33 and 34 cells and simultaneously turning on the transistors of inverter 2 and breaking the current flowing through these transistors. This operation protects the transistors from overcurrents while simultaneously returning the output signal of comparator II to logical O.
    The pulse generator 17 continuously delivers. pulses to cells OR 21-26. Therefore, immediately after resetting the triggers 27 and 28, they receive. these pulses are OR 21 and 22 and are instantly transferred by them. Thereafter, the power transistors of the inverter 2 are turned on, similarly to that described, i.e. begin to conduct current to impregnate the motor 1. However, if the current i flowing through the current sensor 4 (resistor), retains its peak value, the protection of the transistors is repeated to disconnect the power transistors to protect them. After resetting the triggers 27 and 28, they are immediately redistributed by pulses arriving at 4507654
    mi from the generator 17 pulses. This operation takes place continuously until the electric motor 1 stops its operation. an overcurrent with a decrease in the current passing through the current sensor 4 to an acceptable small value. In this case, the power transistors of the inverter 2 of the torus 2 can continue normal switching cycles with the generation of: desired rectangular pulses.
    The use of comparator in Comparison Unit 7 makes it possible to detect 15 overcurrents, regardless of the direction of current flowing through sensor 4.
    权利要求:
    Claims (2)
    [1]
    Invention Formula
    I. An alternating-current drive containing an asynchronous motor connected to an inverter-voltage on fully controlled switches, the power supply of which is connected to a constant-current source 25, current sensors in the phases of the electric motor whose outputs are connected with the first input of the comparison unit, the second input of which is connected to. the first block sets the current, and the outputs 30 connects to the first input of the inverter control unit, the second input of which is connected to the pulse distributor, and the output to the control inputs of the inverter keys, which is distinguished by the inverter fails due to overcurrent and prevents the motor from stopping due to overcurrent, the comparison unit 40 is equipped with three comparators and three matching amplifiers, and the inverter control unit is composed of a pulse generator, three NOT cells, six cells OR, six trigg A ditch, 45 six And cells and six amplifiers, the outputs of which are connected to the control inputs of fully controlled inverter switches, while the inputs of the comparators are connected to the output 50 of the matching amplifiers, whose inputs form the inputs of the comparison unit, the second inputs of the three comparators are connected to the current setting unit, the first, the inputs of the second, fourth, 55th and sixth cells OR are connected
    through the cells NOT, and the first entrances of the the third, and the third of the OR cells, directly with the outputs of the pulse distributor, and the second inputs
    35
    five
    these cells are connected to a pulse generator, the outputs of the OR cells are connected to the first inputs of triggers, the second inputs of the first and second, third and fourth, fifth and sixth triggers are respectively connected to the outputs of the first, second and third comparators, the outputs of the trigger are connected to the first inputs There are six I cells, the second inputs of which are connected to the outputs of the pulse distributor, and the outputs of these cells are connected to the inputs of the six amplifiers of the inverter control unit.
    [2]
    2. The drive according to claim. 1, о t - Licensed by the fact that an additional current sensor is inserted, turned on
    ny
    the inverter power supply circuit, the second current setting unit, the fourth comparator, the switching circuit and the fourth matching amplifier, and six second I cells are inserted into the inverter control unit, the first input of the fourth comparator is connected to an additional current sensor via the fourth matching amplifier, the second input is connected to the second current setting unit, and the output through the switching circuit is connected to the first inputs of the second And cells, the second inputs of which are connected to the outputs of the six first And cells, and the outputs of these cells are connected to six amplifiers inverter control unit.
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    公开号 | 公开日
    DE2965528D1|1983-07-07|
    EP0010980A1|1980-05-14|
    JPS5928152B2|1984-07-11|
    US4291265A|1981-09-22|
    JPS5563579A|1980-05-13|
    EP0010980B1|1983-05-25|
    引用文献:
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    DE1638057B2|1964-12-03|1972-11-23|METHOD OF CONTROLLING THE SPEED OF A THREE-PHASE MACHINE|
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    US3427526A|1967-04-13|1969-02-11|Westinghouse Electric Corp|Inverter drive system|
    US3721836A|1971-11-24|1973-03-20|W Rippel|Current limited transistor switch|
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    BE793379A|1971-12-29|1973-06-27|Italiana Comp|HIGH-POWER STATIC INVERTER WITH INTRINSICALLY PROTECTED AGAINST SHORT-CIRCUITS|
    GB1525416A|1976-04-21|1978-09-20|Mullard Ltd|Dc-dc converter|
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    DE3246706C2|1982-12-17|1987-11-05|Danfoss A/S, Nordborg, Dk|
    JPS59132779A|1983-01-17|1984-07-30|Toshiba Corp|Air conditioner|
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    KR900008393B1|1986-10-02|1990-11-17|미츠비시 덴키 가부시키가이샤|Over current protection circuit for inverter apparatus|
    JP2745691B2|1988-08-30|1998-04-28|富士電機株式会社|Current limiting method of voltage type inverter|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP53136067A|JPS5928152B2|1978-11-04|1978-11-04|
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