JP2005080372A - Converter apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a converter apparatus which can make a circuit for driving a voltage drive type switching element a simple constitution while maintaining its insulating properties, which can supply a DC drive power needing in each switching element from one DC drive power source when a plurality of voltage drive type switching elements are used, and which can adopt a constitution used also as the DC drive power source needing in an inverter when the inverter is used as a load. <P>SOLUTION: The converting apparatus includes a drive circuit 8 which has a pulse transformer 8b connected with the DC drive power source 13, a pulse train control circuit 8a for inducting a pulse-like voltage in a secondary winding by controlling current flowing in the primary winding of the pulse transformer 8b according to a PWM signal, and a gate drive circuit 8c for controlling the gate voltage of a voltage drive type switching element 4 according to a pulse-like voltage induced in the secondary winding. The DC drive power source 13 is used commonly with the DC power source used by the control circuit 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a converter device using voltage-driven switching elements such as MOS transistors and IGBTs.

  Conventionally, as a converter device using a voltage-driven switching element, for example, a digital active filter control device disclosed in Patent Document 1 is known. The outline will be described with reference to FIG. FIG. 4 is a circuit diagram showing a configuration example of a conventional converter device.

  In FIG. 4, 91 is an AC power source, 92 is a rectifier diode, 93 is a reactor coil, 94 is a voltage-driven switching element, 95 is a diode, 96 is a smoothing capacitor, 97 is a load such as an inverter, 98 is a microcomputer, and 99 is An active filter control circuit, 100 is a voltage waveform detection circuit, 101 is a current detection circuit, 102 is a switching element drive circuit composed of an isolation circuit, and 103 is an output voltage detection circuit.

  Next, the operation will be described. The active filter control circuit 99 performs an operation based on the signal from the output voltage detection circuit 103 and the signal from the current detection circuit 101 based on the sine wave input from the voltage waveform detection circuit 100, and performs the operation on the switching element drive circuit 102. To output a PWM signal. As a result, the switching element driving circuit 102 drives the voltage-driven switching element 94 on / off according to the PWM signal, and a DC voltage adjusted to a predetermined value is supplied to the load 97.

JP-A-8-168255

However, in the converter device disclosed in Patent Document 1 described above, the switching element driving circuit 102 supplies a DC driving power source for driving the voltage driven switching element 94 from a power transformer or the like, and a photocoupler or the like. Since the device is configured to insulate the voltage driven switching element 94 and the active filter control circuit 99 from each other,
The number of parts increases. When a three-phase power source is used for the AC power source, the voltage-driven switching element is provided for each phase, so that the number of parts of the drive circuit is considerable and the mounting area is increased. In addition, since a DC drive power supply is required for each voltage-driven switching element, the power transformer used in the power supply circuit that supplies a large number of DC drive power supplies becomes large, making it difficult to reduce the size and cost of the device. I have to.

  The present invention has been made in view of the above, and a circuit for driving a voltage-driven switching element can have a simple configuration while maintaining its insulation, and a plurality of voltage-driven switching elements are used. The DC drive power source required for each switching element can be supplied from a single DC drive power source. When an inverter is used as a load, the DC drive power source required for the inverter can also be used. An object is to obtain a converter device that can be used.

In order to solve the above-described problems and achieve the object, a converter device according to the present invention performs on / off operation of a voltage-driven switching element connected between input terminals or output terminals of a rectifier circuit according to a PWM signal, In a converter device that outputs a desired regulated DC voltage,
A driving circuit for driving the voltage-driven switching element; a pulse transformer; and a first circuit for inducing a pulsed voltage in the secondary winding by controlling a current flowing in the primary winding of the pulse transformer according to the PWM signal; A second circuit for controlling a gate voltage of the voltage-driven switching element according to a pulsed voltage induced in the secondary winding, and connected to the primary winding of the pulse transformer Is shared with the DC power source used by the circuit for calculating and generating the PWM signal, and when there are a plurality of voltage-driven switching elements, it is shared among the drive circuits.

  According to the present invention, the drive circuit for driving the voltage-driven switching element can have a simple configuration with a small number of parts, and the DC drive power source for driving the voltage-driven switching element can be shared with other circuits. One DC power supply can be used. When the connected load is an inverter, the drive circuit for driving the voltage-driven switching element of the upper arm among the voltage-driven switching elements in the inverter has the same configuration as the drive circuit according to the invention described above. In addition, the DC driving power source used by each of the circuits that drive all the voltage driven switching elements in the inverter can be shared. And since the said drive circuit can be made into hybrid IC, size reduction and weight reduction, space saving, and cost reduction can be achieved.

  According to the present invention, the circuit for driving the voltage-driven switching element can be made simple while maintaining its insulation. When a plurality of voltage-driven switching elements are used, it is necessary for each switching element. In the case where an inverter is used as a load, a configuration that also serves as a DC driving power source required for the inverter can be employed.

  Exemplary embodiments of a converter device according to the present invention will be explained below in detail with reference to the accompanying drawings.

Embodiment 1 FIG.
1 is a circuit diagram showing a configuration of a converter device according to a first embodiment of the converter device according to the present invention. In FIG. 1, a rectifier circuit 2 having a diode bridge configuration is connected to a single-phase AC power source 1, and a series circuit of resistance elements R <b> 1 and R <b> 2 is connected between output terminals of the rectifier circuit 2. Further, one end of the reactor coil 3 is connected to the positive terminal of the rectifier circuit 2, and the collector electrode of the IGBT element 4 as a voltage-driven switching element and the anode of the diode 5 are connected to the other end of the reactor coil 3. Has been. The cathode of the diode 5 is connected to the positive end of the smoothing capacitor 6, one end of a series circuit of the resistance elements R 3 and R 4, and one end of the load 7, and the negative end of the smoothing capacitor 6 and the series circuit of the resistance elements R 3 and R 4 are connected. The other end, the other end of the load 7, and the emitter electrode of the IGBT element 4 are commonly connected to the negative end of the rectifier circuit 2.

  The output terminal of the drive circuit 8 is connected to the gate electrode of the IGBT element 4, and a control signal (PWM signal) is input to the drive circuit 8 from the control circuit 9. A current detection circuit 10 is provided on a line connecting the negative electrode end of the rectifier circuit 2 and the negative electrode end of the smoothing capacitor 6, and the output of the current detection circuit 10 is input to the control circuit 9. The voltage waveform detection circuit 11 is connected to the connection end of the resistance elements R1 and R2, and the output of the voltage waveform detection circuit 11 is input to the control circuit 9. The voltage detection circuit 12 is connected to the connection ends of the resistance elements R3 and R4, and the output of the voltage detection circuit 12 is input to the control circuit 9.

  The current detection circuit 10 detects a direct current flowing through the rectifier circuit 2 and outputs it to the control circuit 9. The voltage waveform detection circuit 11 detects a rectified waveform from the divided voltage output from the series circuit of the resistance elements R1 and R2, and outputs the detected rectified waveform to the control circuit 9. The voltage detection circuit 12 detects an output voltage from the divided voltage output from the series circuit of the resistance elements R3 and R4 and outputs the detected output voltage to the control circuit 9.

  The control circuit 9 calculates a PWM signal pattern from the current waveform signal from the current detection circuit 10 and the output voltage signal from the voltage detection circuit 12 based on the rectified waveform signal input from the voltage waveform detection circuit 11, and calculates The PWM signal thus applied is supplied to the drive circuit 8. In addition, when the load 7 is an inverter or a switching power supply, the control circuit 9 also has a function of controlling a switching element used there.

  The drive circuit 8 includes a pulse control circuit 8a that directly receives the output (PWM signal) of the control circuit 9, a pulse transformer 8b in which the output of the pulse control circuit 8a is connected to one end of the primary winding, and a secondary of the pulse transformer 8b. A gate driving circuit 8c is connected to the winding and controls the gate voltage of the IGBT element 4. A DC drive power source 13 is connected to the other end of the primary winding of the pulse transformer 8b having an insulating function.

  In the drive circuit 8, the pulse control circuit 8a causes the primary winding one end of the pulse transformer 8b to contact and separate from the ground in accordance with the PWM signal from the control circuit 9 to induce a pulse voltage in the secondary winding, and based on this, the gate drive circuit 8c Controls the gate voltage of the IGBT element 4 to cause the IGBT element 4 to perform an on / off operation. As a result, the output terminals of the rectifier circuit 2 are short-circuited and separated, and a DC voltage having a predetermined value appears in the smoothing capacitor 6.

  Here, the drive circuit 8 is a hybrid IC, and for example, M57174-06B manufactured by Mitsubishi Electric can be used. The DC drive power supply 13 connected to the other end of the primary winding of the pulse transformer 8b is not a special dedicated power supply but is shared with the DC power supply used by the control circuit 9. That is, a single DC power supply can be used.

  Therefore, according to the first embodiment, the circuit for driving the voltage driven switching element includes the pulse transformer, the circuit for driving the pulse transformer, and the circuit for controlling the gate voltage of the voltage driven switching element. Since a hybrid IC is used, it is possible to reduce size and weight, save space, and reduce costs. In addition, it is possible to use a single power source that does not require a dedicated DC power source and is shared with the control circuit, so that the cost can be further reduced.

Embodiment 2. FIG.
FIG. 2 is a circuit diagram showing a configuration of a converter device according to Embodiment 2 of the converter device according to the present invention. In the first embodiment, an example of application to a converter device in which the output terminals of the rectifier circuit are short-circuited / separated by a switching element has been shown. In the second embodiment, the input terminals of the rectifier circuit are connected by a switching element. An example of application to a converter device of a short circuit / separation type is shown.

  In FIG. 2, one end of a reactor coil 22 is connected to one power supply end of a single-phase AC power supply 21, and one input end of a rectifier circuit 23 having a diode bridge configuration is connected to the other end of the reactor coil 22. The other input terminal of the rectifier circuit 23 is connected to the other power terminal of the single-phase AC power supply 21. Between the output terminals of the rectifier circuit 23, a series circuit of smoothing capacitors 24 and 25, a series circuit of resistance elements R3 and R4, and a load 26 are connected in parallel. A switch 27 is provided between the other input terminal of the rectifier circuit 23 and the connection terminals of the smoothing capacitors 24 and 25.

  One input end of the rectifier circuit 28 in the diode bridge configuration is connected to a connection line between the other end of the reactor coil 22 and one input end of the rectifier circuit 23, and the other input end is the other power source of the single-phase AC power source 21. It is connected to a connection line between the end and the other input end of the rectifier circuit 23. The collector electrode of the IGBT element 29 is connected to the positive terminal of the rectifier circuit 28, and the emitter electrode of the IGBT element 29 is connected to the negative terminal. The output terminal of the drive circuit 30 is connected to the gate electrode of the IGBT element 29, and a control signal (PWM signal) is input to the drive circuit 30 from the control circuit 31.

  A current detection circuit 32 is provided on a connection line between the other power supply end of the single-phase AC power supply 21 and the other input end of the rectifier circuit 23, and an output of the current detection circuit 32 is input to the control circuit 31. A voltage waveform detection circuit 33 is connected between the power supply terminals of the single-phase AC power supply 21, and an output of the voltage waveform detection circuit 33 is input to the control circuit 31. A voltage detection circuit 34 is connected to the connection ends of the resistance elements R3 and R4, and the output of the voltage detection circuit 34 is input to the control circuit 31.

  The current detection circuit 32 detects an alternating current flowing through the single-phase alternating current power supply 21 and outputs it to the control circuit 31. The voltage waveform detection circuit 33 detects the voltage waveform of the single-phase AC power supply 21 and outputs it to the control circuit 31. The voltage detection circuit 34 detects the output voltage from the divided voltage output from the series circuit of the resistance elements R3 and R4 and outputs the detected output voltage to the control circuit 31.

  The control circuit 31 calculates a PWM signal pattern from the current waveform signal from the current detection circuit 32 and the output voltage signal from the voltage detection circuit 12 based on the AC voltage waveform signal input from the voltage waveform detection circuit 33, The calculated PWM signal is given to the drive circuit 30. In addition, when the load 26 is an inverter or a switching power supply, the control circuit 31 also has a function of controlling a switching element used there.

  The drive circuit 30 includes a pulse control circuit 30a that directly receives the output (PWM signal) of the control circuit 31, a pulse transformer 30b in which the output of the pulse control circuit 30a is connected to one end of the primary winding, and a secondary of the pulse transformer 30b. A gate drive circuit 30c is connected to the winding and controls the gate voltage of the IGBT element 29. A DC driving power source 35 is connected to the other end of the primary winding of the pulse transformer 30b having an insulating function.

  In the driving circuit 30, the pulse control circuit 30a induces a pulsed voltage in the secondary winding by bringing one end of the primary winding of the pulse transformer 30b into and out of ground according to the PWM signal from the control circuit 31, and the gate driving circuit 30c based on the induced voltage. Controls the gate voltage of the IGBT element 29 and causes the IGBT element 29 to perform an on / off operation. As a result, the output terminals of the rectifier circuit 28 are short-circuited or separated. As a result, the two phases of the single-phase AC power supply 21, that is, the input terminals of the rectifier circuit 23 are short-circuited / separated, and a predetermined value is applied to both ends of the series circuit of the smoothing capacitors 24 and 25 connected between the output terminals of the rectifier circuit 23. DC voltage appears. Note that the voltage doubler system / full wave system can be switched by closing / opening the switch 27.

  Here, the drive circuit 30 is a hybrid IC, and for example, M57174-06B manufactured by Mitsubishi Electric can be used. The DC driving power source 35 connected to the other end of the primary winding of the pulse transformer 30b is not a special dedicated power source but is shared with the DC power source used by the control circuit 31. That is, a single DC power supply can be used.

  Therefore, according to the second embodiment, as in the first embodiment, the pulse drive, the circuit for driving the pulse transformer, and the gate voltage of the voltage drive switching element are applied to the circuit for driving the voltage drive switching element. Since a hybrid IC in which a circuit to be controlled is incorporated is used, a reduction in size and weight, space saving, and cost reduction can be achieved. In addition, it is possible to use a single power source that does not require a dedicated DC power source and is shared with the control circuit, so that the cost can be further reduced.

Embodiment 3 FIG.
FIG. 3 is a circuit diagram showing a configuration of a converter device according to Embodiment 3 of the converter device according to the present invention. In this Embodiment 3, the example of application to the converter apparatus in case load is an inverter is shown. That is, in FIG. 3, the converter device according to the third embodiment includes a converter unit 40 and an inverter unit 41.

  In the converter unit 40, a three-phase rectifier circuit 44 is connected to each phase of the three-phase AC power supply 42 via a reactor coil 43, and smoothing capacitors 45 and 46 are connected in series between the output terminals of the three-phase rectifier circuit 44. A circuit and a series circuit of resistance elements R5 and R6 are connected in parallel. Further, one input terminal of a rectifier circuit 47, 48, 49 in a diode bridge configuration is connected to each phase input terminal of the three-phase rectifier circuit 44, and the other input terminal of the rectifier circuits 47, 48, 49 is respectively It is connected to the connection ends of the smoothing capacitors 45 and 46 through a harmonic suppression capacitor 50.

  The collector electrode of the IGBT element 51 is connected to the positive terminal of the rectifier circuit 47, and the emitter electrode of the IGBT element 51 is connected to the negative terminal. The output terminal of the drive circuit 52 is connected to the gate electrode of the IGBT element 51, and a control signal (PWM signal) is input to the drive circuit 52 from the control circuit 57. The drive circuit 52 includes a pulse control circuit 52a that directly receives the output (PWM signal) of the control circuit 57, a pulse transformer 52b in which the output of the pulse control circuit 52a is connected to one end of the primary winding, and a secondary of the pulse transformer 52b. A gate drive circuit 52c is connected to the winding and controls the gate voltage of the IGBT element 51. A DC driving power source 52d is connected to the other end of the primary winding of the pulse transformer 52b having an insulating function.

  The collector electrode of the IGBT element 53 is connected to the positive terminal of the rectifier circuit 48, and the emitter electrode of the IGBT element 53 is connected to the negative terminal. The output terminal of the drive circuit 54 is connected to the gate electrode of the IGBT element 53, and a control signal (PWM signal) is input to the drive circuit 54 from the control circuit 57. The drive circuit 54 includes a pulse control circuit 54a that directly receives the output (PWM signal) of the control circuit 57, a pulse transformer 54b in which the output of the pulse control circuit 54a is connected to one end of the primary winding, and a secondary of the pulse transformer 54b. A gate drive circuit 54c is connected to the winding and controls the gate voltage of the IGBT element 53. A DC drive power supply 54d is connected to the other end of the primary winding of the pulse transformer 54b having an insulating function.

  The collector electrode of the IGBT element 55 is connected to the positive terminal of the rectifier circuit 49, and the emitter electrode of the IGBT element 55 is connected to the negative terminal. The output terminal of the drive circuit 56 is connected to the gate electrode of the IGBT element 55, and a control signal (PWM signal) is input to the drive circuit 56 from the control circuit 57. The drive circuit 56 includes a pulse control circuit 56a that directly receives the output (PWM signal) of the control circuit 57, a pulse transformer 56b in which the output of the pulse control circuit 56a is connected to one end of the primary winding, and a secondary of the pulse transformer 56b. A gate drive circuit 56c is connected to the winding and controls the gate voltage of the IGBT element 55. A DC drive power supply 56d is connected to the other end of the primary winding of the pulse transformer 56b having an insulating function.

  A current detection circuit 58 is disposed on one phase line of the three-phase AC power supply 42, and the output of the current detection circuit 58 is input to the control circuit 57. In addition, a voltage phase detection circuit 59 is connected to each phase line of the three-phase AC power supply 42, and an output of the voltage phase detection circuit 59 is input to the control circuit 57. The voltage detection circuit 60 is connected to the connection ends of the resistance elements R5 and R6, and the output of the voltage detection circuit 60 is input to the control circuit 57.

  Next, in the inverter unit 41, between the output terminals of the rectifier circuit 44, a series circuit of the IGBT element 71 of the upper arm and the IGBT element 72 of the lower arm, and a series of the IGBT element 73 of the upper arm and the IGBT element 74 of the lower arm are connected. The circuit and the series circuit of the IGBT element 75 of the upper arm and the IGBT element 76 of the lower arm are connected in parallel. The connection ends of the upper arm and the lower arm are the output terminals, respectively. It is connected.

  The output terminals of the drive circuit 78 are connected to the gate electrodes of the IGBT element 71 and the IGBT element 72, and control signals (PWM signals) for the upper arm and the lower arm are input from the control circuit 57 to the drive circuit 78. The The drive circuit 78 includes a pulse control circuit 78a that directly receives the upper arm control signal (PWM signal) of the control circuit 57, a pulse transformer 78b in which the output of the pulse control circuit 78a is connected to one end of the primary winding, and a pulse transformer. The gate drive circuit 78c connected to the secondary winding of 78b and controls the gate voltage of the IGBT element 71 and the control signal for the lower arm (PWM signal) of the control circuit 57 are directly received to control the gate voltage of the IGBT element 72. And a gate drive circuit 78e. A DC drive power supply 78d is connected to the other end of the primary winding of the pulse transformer 78b having an insulating function. The gate drive circuit 78e is connected to a DC drive power supply 78f.

  The output terminals of the drive circuit 79 are connected to the gate electrodes of the IGBT element 73 and the IGBT element 74, and control signals (PWM signals) for the upper arm and the lower arm are input from the control circuit 57 to the drive circuit 79. The The drive circuit 79 includes a pulse control circuit 79a that directly receives the upper arm control signal (PWM signal) of the control circuit 57, a pulse transformer 79b in which the output of the pulse control circuit 79a is connected to one end of the primary winding, and a pulse transformer The gate drive circuit 79c, which is connected to the secondary winding of 79b and controls the gate voltage of the IGBT element 73, and the lower arm control signal (PWM signal) of the control circuit 57 is directly received to control the gate voltage of the IGBT element 74. And a gate drive circuit 79e. A DC drive power supply 79d is connected to the other end of the primary winding of the pulse transformer 79b having an insulating function. The gate drive circuit 79e is connected to a DC drive power supply 79f.

  The output terminals of the drive circuit 80 are connected to the gate electrodes of the IGBT element 75 and the IGBT element 76, and control signals (PWM signals) for the upper arm and the lower arm are input from the control circuit 57 to the drive circuit 80. The The drive circuit 80 includes a pulse control circuit 80a that directly receives the upper arm control signal (PWM signal) of the control circuit 57, a pulse transformer 80b in which the output of the pulse control circuit 80a is connected to one end of the primary winding, The gate drive circuit 80c, which is connected to the secondary winding of 80b and controls the gate voltage of the IGBT element 75, and the control signal for the lower arm of the control circuit 57 (PWM signal) is directly received to control the gate voltage of the IGBT element 76. And a gate drive circuit 80e. A DC drive power supply 80d is connected to the other end of the primary winding of the pulse transformer 80b having an insulating function. The gate drive circuit 80e is connected to a DC drive power supply 80f.

  A current detection circuit 81 is disposed on a connection line between the connection end of the IGBT element 71 and the IGBT element 72 and the three-phase motor 77, and an output of the current detection circuit 81 is input to the control circuit 57. Further, a current detection circuit 82 is disposed on a connection line between the connection end of the IGBT element 75 and the IGBT element 76 and the three-phase motor 77, and an output of the current detection circuit 82 is input to the control circuit 57.

  The control circuit 57 applies PWM to the converter unit 40 from the current waveform signal from the current detection circuit 58 and the output voltage signal from the voltage detection circuit 60 based on the AC voltage phase signal input from the voltage phase detection circuit 59. The signal pattern is calculated, and the calculated PWM signal is supplied to the drive circuits 52, 54, and 56. The control circuit 57 calculates a PWM signal pattern to be applied to the inverter unit 41 from the output voltage signal from the voltage detection circuit 60 and the current waveform signals from the current detection circuits 81 and 82, and the calculated PWM signal is a drive circuit. 78, 79, 80.

  Here, in the converter unit 40, the drive circuits 52, 54, and 56 are hybrid ICs, and for example, M57174-06B manufactured by Mitsubishi Electric Corporation can be used. The DC drive power supplies 52d, 54d, and 56d are not special dedicated power supplies but are shared with the DC power supply used by the control circuit 57. Moreover, in the inverter part 41, the drive circuits 78, 79, and 80 are made into a hybrid IC, and for example, M57174-06B manufactured by Mitsubishi Electric can be used. The DC drive power supplies 78d, 78f, 79d, 79f, 80d, and 80f are not special dedicated power supplies but are shared with the DC power supply used by the control circuit 57. That is, the converter unit 40 and the inverter unit 41 can be configured using a single DC power source.

  Therefore, according to the third embodiment, similarly to the first and second embodiments, the circuit for driving the voltage-driven switching element includes the pulse transformer, the circuit for driving the pulse transformer, and the gate of the voltage-driven switching element. Since a hybrid IC incorporating a circuit for controlling voltage is used, it is possible to reduce the size and weight, save space, and reduce the cost. In addition, it is possible to use a single power source that does not require a dedicated DC power source and is shared with the control circuit, so that the cost can be further reduced.

  As described above, the converter device according to the present invention is useful for reducing the size and weight, saving the space, and reducing the cost.

It is a circuit diagram which shows the structure of the converter apparatus by Embodiment 1 of the converter apparatus concerning this invention. It is a circuit diagram which shows the structure of the converter apparatus by Embodiment 2 of the converter apparatus concerning this invention. It is a circuit diagram which shows the structure of the converter apparatus by Embodiment 3 of the converter apparatus concerning this invention. It is a circuit diagram which shows the structural example of the conventional converter apparatus.

Explanation of symbols

1,21 Single-phase AC power source 2,23,28,47,48,49 Rectifier circuit 3,22,43 Reactor coil 4,29,51,53,56,71,72,73,74,75,76 IGBT element (Voltage-driven switching element)
5 Diode 6, 24, 25, 45, 46 Smoothing capacitor 7, 26 Load 8, 30, 52, 54, 56, 78, 79, 80 Drive circuit 8a, 30a, 52a, 54a, 56a, 78a, 79a, 80a Pulse train Control circuit 8b, 30b, 52b, 54b, 56b, 78b, 79b, 80b Pulse transformer 8c, 30c, 52c, 54c, 56c, 78c, 79c, 80c Gate drive circuit 9, 31, 57 Control circuit 10, 32, 58, 81, 82 Current detection circuit 11, 33 Voltage waveform detection circuit 12, 34, 60 Voltage detection circuit 13, 35, 52d, 54d, 56d, 78d, 78f, 79d, 79f, 80d, 80f DC drive power supply 42 Three-phase AC Power supply 44 Three-phase rectifier circuit 59 Voltage phase detection circuit 50 Capacitor for suppressing harmonics 77 Three-phase motor

Claims (3)

In a converter device that turns on / off a voltage-driven switching element connected between input terminals or output terminals of a rectifier circuit according to a PWM signal, and outputs a desired regulated DC voltage,
A driving circuit for driving the voltage-driven switching element,
A pulse transformer,
A first circuit for controlling a current flowing in the primary winding of the pulse transformer according to the PWM signal to induce a pulsed voltage in the secondary winding;
A second circuit for controlling a gate voltage of the voltage-driven switching element according to a pulsed voltage induced in the secondary winding,
The DC driving power source connected to the primary winding of the pulse transformer is shared with the DC power source used by the circuit for calculating and generating the PWM signal. When there are a plurality of voltage driven switching elements, A converter device that is shared between circuits.   2. The drive circuit according to claim 1, wherein when the load that receives the desired regulated DC voltage is an inverter, a drive circuit that drives the voltage-driven switching element of the upper arm among the voltage-driven switching elements in the inverter; The DC driving power source that has the same configuration and that is used by each of the circuits that drive all voltage-driven switching elements in the inverter is shared with the DC driving power source that the driving circuit according to claim 1 uses. The converter device according to claim 1, wherein: The converter device according to claim 1, wherein the drive circuit is a hybrid IC.

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