JP6128836B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device including a power conversion circuit configured by bridge-connecting four switching elements having diodes connected in antiparallel.

  2. Description of the Related Art Conventionally, as a power conversion device including a power conversion circuit configured by bridge-connecting four switching elements having diodes connected in antiparallel, there is a power conversion device disclosed in Patent Document 1 shown below, for example.

  This power conversion device is a device that converts alternating current supplied from an alternating current power source into direct current and supplies it to a secondary battery. Conversely, it is also a device that converts the direct current supplied from the secondary battery into alternating current and supplies it to the alternating current power supply. The power converter includes a rectifier circuit, a buck-boost converter circuit, a filter circuit, and a control device.

  The rectifier circuit is a circuit in which an AC terminal is connected to an AC power source through a filter circuit, a DC terminal is connected to a step-up / down converter circuit, and an alternating current supplied from the AC power source is converted into a direct current and supplied to the step-up / down converter circuit. is there. Conversely, it is also a circuit that converts the direct current supplied from the step-up / down converter circuit into alternating current and supplies it to the alternating current power supply. The rectifier circuit includes four switching elements having diodes connected in antiparallel. The four switching elements are bridge-connected. The rectifier circuit turns off the switching element, converts the alternating current supplied from the alternating current power source into direct current by the diode, and supplies the direct current to the step-up / down converter circuit. Further, by switching the switching element at a predetermined timing, the direct current supplied from the buck-boost converter circuit is converted into alternating current and supplied to the alternating current power supply.

  The buck-boost converter circuit is a circuit that is connected to the rectifier circuit and the secondary battery, respectively, and boosts or steps down the direct current supplied from the rectifier circuit and supplies it to the secondary battery. Conversely, it is also a circuit that boosts or steps down the direct current supplied from the secondary battery and supplies it to the rectifier circuit.

  The filter circuit is connected between the AC power source and the rectifier circuit, and is a circuit that removes a predetermined frequency component included in the AC supplied from the AC power source to the rectifier circuit. The filter circuit includes a reactor and a capacitor. For example, the reactor is connected between the AC power source and the AC terminal of the rectifier circuit. The capacitor is connected in parallel to the AC terminal of the rectifier circuit.

  The control device is a device that is connected to the rectifier circuit and the buck-boost converter circuit, respectively, and controls the rectifier circuit and the buck-boost converter circuit. When the alternating current supplied from the alternating current power source is converted into direct current and supplied to the secondary battery, the control device turns off the switching element of the rectifier circuit and controls the buck-boost converter circuit. The rectifier circuit converts an alternating current supplied from an alternating current power source into a direct current by a diode and supplies it to the step-up / down converter circuit. The step-up / step-down converter circuit boosts or steps down the direct current supplied from the rectifier circuit and supplies it to the secondary battery. When the control device converts the direct current supplied from the secondary battery into alternating current and supplies the alternating current power to the alternating current power supply, the control device controls the step-up / down converter circuit and also includes a switching element pair composed of switching elements arranged at the diagonal of the rectifier circuit. Of these, the switching elements constituting one switching element pair and the switching elements constituting the other switching element pair are complementarily switched. For example, the switching is performed complementarily in synchronization with the timing at which the polarity of the voltage of the AC power supply is switched. The step-up / step-down converter circuit boosts or steps down the direct current supplied from the secondary battery and supplies it to the rectifier circuit. The rectifier circuit converts the direct current supplied from the step-up / down converter circuit into an alternating current and supplies the alternating current to the alternating current power supply.

JP2012-0859797

  By the way, a surge voltage is generated with the switching of the switching element due to the influence of the floating inductance of the wiring. Therefore, a snubber circuit is used to suppress the surge voltage and protect the switching element. The snubber circuit is composed of, for example, a resistor and a capacitor. The resistor and the capacitor are connected in series and are connected in parallel to the DC terminal of the rectifier circuit. As a result, the capacitor of the filter circuit is connected in parallel to the AC terminal of the rectifier circuit, and the capacitor of the snubber circuit is connected in parallel to the DC terminal of the rectifier circuit.

  In a state where the power conversion device is not operating, an AC voltage supplied from an AC power supply is applied to the capacitor of the filter circuit. A direct current voltage converted by a diode of the rectifier circuit is applied to the capacitor of the snubber circuit, and the capacitor is charged. Therefore, an AC voltage is applied to the AC terminal of the rectifier circuit, and a DC voltage is applied to the DC terminal of the rectifier circuit.

  When the direct current supplied from the secondary battery is converted into alternating current and supplied to the alternating current power supply, the control device selects one switching element pair from among the switching element pairs formed of the switching elements arranged at the diagonal of the rectifier circuit. The switching element constituting the switching element and the switching element constituting the other switching element pair are complementarily switched in synchronism with the timing at which the polarity of the voltage of the AC power source is switched. As described above, an AC voltage is applied to the AC terminal of the rectifier circuit, and a DC voltage is applied to the DC terminal of the rectifier circuit. Therefore, due to the voltage difference between the DC terminal and the AC terminal of the rectifier circuit, there is a problem that an inrush current flows in a path from the snubber circuit capacitor to the filter circuit capacitor immediately after the start of switching.

  This invention is made | formed in view of such a situation, and it aims at providing the power converter device which can suppress the inrush current which generate | occur | produces immediately after the switching start of a power converter circuit.

The present invention, which has been made to solve the above-mentioned problems, is configured by bridge-connecting four switching elements in which diodes are connected in anti-parallel, and by switching off the switching elements, the AC is connected to the AC terminal by the diode. Converts the alternating current supplied from the power source into direct current and supplies it to the direct current power source connected to the direct current terminal, or converts the direct current supplied from the direct current power source into alternating current by switching the switching element and supplies it to the alternating current power source Power conversion circuit, a first capacitor connected in parallel to the AC terminal of the power conversion circuit, a second capacitor connected in parallel to the DC terminal of the power conversion circuit, and connected to the power conversion circuit and supplied from the AC power supply When converting alternating current to direct current and supplying it to a direct current power supply, turn off the switching element of the power conversion circuit and direct the direct current supplied from the direct current power supply to the alternating current. When the power is converted and supplied to the AC power supply, the switching elements constituting one switching element pair and the other switching element pair among the switching element pairs formed of the switching elements arranged diagonally of the power conversion circuit are constituted. And a control circuit that switches the switching element in a complementary manner in synchronization with the timing at which the polarity of the voltage of the AC power supply is switched, wherein the control circuit has a low potential among the switching elements constituting the power conversion circuit. A bootstrap circuit that supplies the voltage required to drive the switching element on the high potential side when the switching element on the side is turned on, and converts the direct current supplied from the direct current power source into alternating current and supplies it to the alternating current power source The switching element constituting one switching element pair and the other switching element Just before the switching elements constituting the pair are complementarily switched in synchronization with the timing at which the polarity of the voltage of the AC power supply is switched, at the timing when the voltage of the AC power supply falls within a predetermined range including the peak value, Turn on the switching element that constitutes the switching element pair or the switching element that constitutes the other switching element pair, and configure one switching element pair at the timing when the voltage of the AC power supply falls within a predetermined range including the peak value The switching element on the low potential side is turned on just before the switching element constituting the other switching element pair or the switching element constituting the other switching element pair is turned on and before the timing of switching the polarity of the voltage of the AC power supply. At a timing when the current voltage falls within a predetermined range including the peak value. When turning on the switching element constituting one switching element pair, immediately before turning on the switching element constituting one switching element pair at a timing when the voltage of the AC power supply falls within a predetermined range including the peak value, The switching element constituting one switching element pair and the switching element constituting the other switching element pair are switched from the timing at which switching is started in a complementary manner in synchronization with the timing at which the polarity of the voltage of the AC power supply is switched. Before the second cycle, and when the polarity of the AC power supply is complementary to the polarity from the timing when the AC power supply starts complementary to the previous 1/2 cycle, the low potential side of the other switching element pair When the switching element is turned on, the AC power supply voltage falls within a predetermined range including the peak value. In the case of turning on the switching element constituting the other switching element pair, immediately before turning on the switching element constituting the other switching element pair at a timing when the voltage of the AC power source falls within a predetermined range including the peak value. Therefore, the switching element constituting one switching element pair and the switching element constituting the other switching element pair are switched from the timing at which switching is started complementarily in synchronization with the timing at which the polarity of the voltage of the AC power supply is switched. One switching element pair is low when the polarity of the AC power supply is opposite to the polarity from the timing before the AC power supply voltage starts complementary switching to 1/2 cycle before the AC cycle. The switching element on the potential side is turned on .

According to this configuration, switching can be started in a state where the voltage difference between the DC terminal and the AC terminal of the power conversion circuit is reduced. Therefore, the inrush current that occurs immediately after the start of switching can be suppressed. In addition, at the timing when the voltage of the AC power supply falls within a predetermined range including the peak value, immediately before turning on the switching element constituting one switching element pair, or the switching element constituting the other switching element pair, The switching element on the low potential side is turned on before the timing of switching the polarity of the voltage of the AC power supply. Therefore, a voltage necessary for driving the switching element on the high potential side can be supplied.

It is a circuit diagram of the power converter device in a reference form . FIG. 2 is a block diagram relating to step-up / down converter circuit control of the control circuit in FIG. 1. It is a block diagram regarding the rectifier circuit control of the control circuit in FIG. It is a wave form diagram of the voltage and drive signal of the alternating current power supply of the power converter in a reference form . It is a timing chart for demonstrating operation | movement of the power converter device in a reference form . It is a timing chart for demonstrating operation | movement of the conventional power converter device. It is a circuit diagram of a power converter in an embodiment . FIG. 7 is a detailed circuit diagram of a drive circuit for the rectifier circuit in FIG. 6. It is a block diagram regarding the rectifier circuit control of the control circuit in FIG. It is a waveform diagram of the voltage and drive signal of the AC power supply of the power conversion device in the embodiment . It is a timing chart for demonstrating operation | movement of the power converter device in embodiment .

Next, the present invention will be described in more detail with reference embodiments and embodiments. In the reference form and the embodiment, the power conversion device according to the present invention supplies the power conversion device that bidirectionally converts the power between the home AC power source and the in-vehicle battery mounted on the electric vehicle or the hybrid vehicle. The example applied to the converter is shown.

( Reference form )
First, with reference to FIG. 1, the structure of the power converter device of a reference form is demonstrated.

  The power conversion device 1 shown in FIG. 1 is a device that converts alternating current supplied from a home AC power supply AC1 into direct current and supplies the direct current to the in-vehicle battery B1. Conversely, it is also a device that converts the direct current supplied from the in-vehicle battery B1 into alternating current and supplies it to the home AC power supply AC1. That is, it is a device that converts and supplies power bidirectionally between the home AC power supply AC1 and the in-vehicle battery B1. The power conversion device 1 includes a rectifier circuit 10 (power conversion circuit), a step-up / down converter circuit 11 (DC power supply), a filter circuit 12, a snubber circuit 13, a smoothing capacitor 14, and a control circuit 15. .

  The rectifier circuit 10 has an AC terminal connected to the AC power supply AC1 via the filter circuit 12 and a DC terminal connected to the buck-boost converter circuit 11, respectively, and converts the alternating current supplied from the AC power supply AC1 into direct current to convert the buck-boost converter circuit. 11 is a circuit to be supplied to 11. Conversely, it is also a circuit that converts the direct current supplied from the step-up / down converter circuit 11 into alternating current and supplies it to the alternating current power supply AC1. The rectifier circuit 10 includes IGBTs 100a to 100d (switching elements) and diodes 100e to 100h.

  The IGBTs 100a and 100b and the IGBTs 100c and 100d are respectively connected in series. Specifically, the emitters of the IGBTs 100a and 100c are connected to the collectors of the IGBTs 100b and 100d, respectively. The IGBTs 100a and 100b and the IGBTs 100c and 100d connected in series are connected in parallel. Specifically, the emitters of the IGBTs 100a and 100c and the collectors of the IGBTs 100b and 100d are connected to each other. That is, the IGBTs 100a to 100d are bridge-connected. The connection points of the IGBTs 100 a and 100 b and the IGBTs 100 c and 100 d form an AC terminal, and are connected to the AC power source AC <b> 1 via the filter circuit 12. The collectors of the IGBTs 100a and 100c and the emitters of the IGBTs 100b and 100d form a DC terminal, and are connected to the buck-boost converter circuit 11 and the snubber circuit 13, respectively. The gates of the IGBTs 100a to 100d are connected to the control circuit 15, respectively.

  The anodes of the diodes 100e to 100h are connected to the emitters of the IGBTs 100a to 100d, and the cathodes are connected to the collectors of the IGBTs 100a to 100d, respectively. That is, the diodes 100e to 100h are connected in reverse parallel to the IGBTs 100a to 100d.

  The rectifier circuit 10 turns off the IGBTs 100a to 100d, converts the alternating current supplied from the alternating current power supply AC1 into direct current by the diodes 100e to 100h, and supplies the direct current to the step-up / down converter circuit 11. Further, by switching the IGBTs 100a to 100d at a predetermined timing, the direct current supplied from the step-up / down converter circuit 11 is converted into alternating current and supplied to the alternating current power supply AC1.

  The step-up / down converter circuit 11 is a circuit that is connected to the rectifier circuit 10 and the in-vehicle battery B1, respectively, and that boosts or steps down the direct current supplied from the rectifier circuit 10 and supplies it to the in-vehicle battery B1. Conversely, it is also a circuit that boosts or steps down the direct current supplied from the in-vehicle battery B <b> 1 and supplies it to the rectifier circuit 10. The buck-boost converter circuit 11 includes IGBTs 110a to 110d, diodes 110e to 110h, and a reactor 110i.

  The IGBTs 110a and 110b and the IGBTs 110c and 110d are respectively connected in series. Specifically, the emitters of the IGBTs 110a and 110c are connected to the collectors of the IGBTs 110b and 110d, respectively. The connection point of IGBTs 110a and 110b is connected to one end of reactor 110i, and the connection point of IGBTs 110c and 110d is connected to the other end of reactor 110i. The collector of the IGBT 110a is connected to the collectors of the IGBTs 100a and 100c, and the emitter of the IGBT 110b is connected to the emitters of the IGBTs 100b and 100d. The collector of IGBT 110c is connected to the positive terminal of in-vehicle battery B1, and the emitter of IGBT 110d is connected to the emitter of IGBT 110b and the negative terminal of in-vehicle battery B1. The gates of the IGBTs 110 a to 110 d are connected to the control circuit 15, respectively.

  The anodes of the diodes 110e to 110h are connected to the emitters of the IGBTs 110a to 110d, and the cathodes are connected to the collectors of the IGBTs 110a to 110d, respectively. That is, the diodes 110e to 110h are connected in reverse parallel to the IGBTs 110a to 110d.

  The step-up / step-down converter circuit 11 switches the IGBTs 110a to 110d at a predetermined timing, thereby boosting or stepping down the direct current supplied from the rectifier circuit 10 and supplying the direct current to the in-vehicle battery B1. Further, by switching the IGBTs 110 a to 110 d at a predetermined timing, the direct current supplied from the in-vehicle battery B <b> 1 is stepped up or stepped down and supplied to the rectifier circuit 10.

  The filter circuit 12 is connected between the AC power supply AC1 and the AC terminal of the rectifier circuit 10 and is a circuit that removes a predetermined frequency component included in the AC. Specifically, the circuit removes high frequency components. The filter circuit 12 includes a reactor 120a and a capacitor 120b (first capacitor). Reactor 120a has one end connected to one end of AC power supply AC1 and the other end connected to a connection point between IGBTs 100a and 100b. One end of the capacitor 120b is connected to the other end of the reactor 120a, and the other end is connected to the other end of the AC power supply AC1 and a connection point between the IGBTs 100c and 100d. That is, the capacitor 120 b is connected in parallel to the AC terminal of the rectifier circuit 10.

  The snubber circuit 13 is a circuit for protecting the IGBT by suppressing a surge voltage generated due to the switching of the IGBT due to the influence of the floating inductance of the wiring. The snubber circuit 13 includes a resistor 130a and a capacitor 130b (second capacitor). The resistor 130a and the capacitor 130b are connected in series. Specifically, one end of the resistor 130a is connected to one end of the capacitor 130b. The other end of the resistor 130a is connected to the collectors of the IGBTs 100a and 100c, and the other end of the capacitor 130b is connected to the emitters of the IGBTs 100b and 100d. That is, the capacitor 130b is connected in parallel to the AC terminal of the rectifier circuit 10 via the resistor 130a.

  The smoothing capacitor 14 is an element that is connected to the step-up / step-down converter circuit 11 and the in-vehicle battery B1 and smoothes direct current. One end of the smoothing capacitor 14 is connected to the collector of the IGBT 110c and the positive terminal of the in-vehicle battery B1, and the other end is connected to the emitter of the IGBT 110d and the negative terminal of the in-vehicle battery B1.

  The control circuit 15 is a device that is connected to the rectifier circuit 10 and the buck-boost converter circuit 11, and controls the rectifier circuit 10 and the buck-boost converter circuit 11.

  The control circuit 15 turns off the IGBTs 100a to 100d and switches the IGBTs 110a to 110d at a predetermined timing when the alternating current supplied from the alternating current power supply AC1 is converted into direct current and supplied to the in-vehicle battery B1.

  On the other hand, when the direct current supplied from the in-vehicle battery B1 is converted into alternating current and supplied to the alternating current power supply AC1, the IGBTs 110a to 110d are switched at a predetermined timing, and the switching composed of the IGBTs arranged diagonally of the rectifier circuit 10 is performed. Among the element pairs, the IGBTs 100a and 100d constituting one switching element pair and the IGBTs 100b and 100c constituting the other switching element pair are complementarily switched in synchronization with the timing at which the polarity of the voltage of the AC power supply AC1 is switched. .

  At that time, the IGBTs 100a and 100d and the IGBTs 100b and 100c are immediately switched in a complementary manner in synchronization with the timing of switching of the polarity of the voltage of the AC power supply AC1, and the voltage of the AC power supply AC1 is within a predetermined range including the peak value. At the timing, the IGBTs 100a and 100d or the IGBTs 100b and 100c are turned on. Specifically, the IGBTs 100a and 100d or the IGBTs 100b and 100c are turned on from the timing at which the voltage of the AC power supply AC1 falls within a predetermined range including the peak value to the timing at which the polarity of the voltage of the AC power supply AC1 is switched.

  Here, the predetermined range is a range of 95% to 100% of the peak value. This is a value determined so that the inrush current is within a range that does not cause a problem in practice. The control circuit 15 includes current sensors 150 and 151, voltage sensors 152 and 153, drive circuits 154 and 155, and a microcomputer 156.

  The current sensor 150 detects an AC current supplied from the AC power supply AC1 to the rectifier circuit 10 via the filter circuit 12, or an AC current supplied from the rectifier circuit 10 to the AC power supply AC1 via the filter circuit 12. It is an element that outputs a detection result. The current sensor 150 is provided so as to clamp the wiring to the wiring connecting the AC power supply AC1 and the filter circuit 12. The output terminal of the current sensor 150 is connected to the microcomputer 156.

  The current sensor 151 is an element that detects a current flowing through the reactor 110i and outputs a detection result. The current sensor 151 is provided so as to clamp the wiring to the wiring connecting the connection point of the IGBTs 110a and 110b and the reactor 110i. The output terminal of the current sensor 151 is connected to the microcomputer 156.

  The voltage sensor 152 detects an AC voltage supplied from the AC power supply AC1 to the rectifier circuit 10 via the filter circuit 12, or an AC voltage supplied from the rectifier circuit 10 to the AC power supply AC1 via the filter circuit 12. It is an element that outputs a detection result. The voltage sensor 152 is connected to one end and the other end of the AC power supply AC1. The output terminal of the voltage sensor 152 is connected to the microcomputer 156.

  The voltage sensor 153 is an element that detects a DC voltage supplied from the step-up / step-down converter circuit 11 to the vehicle-mounted battery B1 or a DC voltage supplied from the vehicle-mounted battery B1 to the step-up / down converter circuit 11 and outputs a detection result. . The voltage sensor 153 is connected to the positive electrode end and the negative electrode end of the in-vehicle battery B1. The output terminal of the voltage sensor 153 is connected to the microcomputer 156.

  The drive circuit 154 is a circuit that supplies voltages to the gates of the IGBTs 100a to 100d based on a drive signal input from the microcomputer 156, and drives the IGBTs 100a to 100d. Specifically, this is a circuit that turns on the IGBT when the drive signal is at a high level. The drive circuit 154 is connected to the microcomputer 156 and the gates and emitters of the IGBTs 100a to 100d, respectively.

  The drive circuit 155 is a circuit that supplies voltages to the gates of the IGBTs 110a to 110d based on a drive signal input from the microcomputer 156, and drives the IGBTs 110a to 110d. Specifically, this is a circuit that turns on the IGBT when the drive signal is at a high level. The drive circuit 155 is connected to the microcomputer 156 and the gates and emitters of the IGBTs 110a to 110d, respectively.

  The microcomputer 156 is an element that generates and outputs drive signals for driving the IGBTs 100a to 100d and 110a to 110d based on the detection results of the current sensors 150 and 151 and the voltage sensors 152 and 153.

  The microcomputer 156 generates and outputs drive signals PWM1H, PWM1L, PWM2H, and PWM2L for turning off the IGBTs 100a to 100d and converts the alternating current supplied from the alternating current power supply AC1 into direct current and supplies it to the onboard battery B1. Drive signals PWM3H, PWM3L for switching the IGBTs 110a to 110d at a predetermined timing based on the detection results of the current sensors 150, 151 and the voltage sensors 152, 153 so that the DC voltage supplied to the battery B1 becomes a predetermined voltage. PWM4H and PWM4L are generated and output.

  On the other hand, when the direct current supplied from the in-vehicle battery B1 is converted into alternating current and supplied to the alternating current power supply AC1, the direct current voltage supplied to the rectifier circuit 10 becomes a voltage corresponding to the instantaneous value of the alternating current voltage of the alternating current power supply AC1. In addition, based on the detection results of the current sensors 150 and 151 and the voltage sensors 152 and 153, the drive signals PWM3H, PWM3L, PWM4H, and PWM4L that switch the IGBTs 110a to 110d at a predetermined timing are generated and output, and the IGBTs 100a and 100d are output. Drive signals PWM1H, PWM1L, PWM2H, and PWM2L that complementarily switch the IGBTs 100b and 100c in synchronization with the timing at which the polarity of the voltage of the AC power supply AC1 is switched are generated and output.

  At that time, the IGBTs 100a and 100d and the IGBTs 100b and 100c are immediately switched in a complementary manner in synchronization with the timing of switching of the polarity of the voltage of the AC power supply AC1, and the voltage of the AC power supply AC1 is within a predetermined range including the peak value. The drive signals PWM1H, PWM1L, PWM2H, and PWM2L that turn on the IGBTs 100a and 100d or the IGBTs 100b and 100c are generated from the timing at which the polarity of the voltage of the AC power supply AC1 is switched.

  Here, the drive signals PWM1H, PWM1L, PWM2H, and PWM2L are drive signals for the IGBTs 100a to 100d. The drive signals PWM3H, PWM3L, PWM4H, and PWM4L are drive signals for the IGBTs 110a to 110d. The microcomputer 156 is connected to the output terminals of the current sensors 150 and 151 and the voltage sensors 152 and 153, respectively. Further, they are connected to drive circuits 154 and 155, respectively.

  As shown in FIG. 2, the microcomputer 156 generates the drive signals PWM3H and PWM3L of the IGBTs 110a and 110b when converting the direct current supplied from the in-vehicle battery B1 into alternating current and supplying the alternating current to the AC power supply AC1. A unit 156a, a multiplier 156b, a drive signal generator 156c, and a NOT circuit unit 156d. Further, in order to generate the drive signals PWM4H and PWM4L of the IGBTs 110c and 110d, a divider 156e, a deviation calculator 156f, a PI calculator 156g, an adder 156h, a divider 156i, a drive signal generator 156j, And NOT circuit portion 156k. Division unit 156a, multiplication unit 156b, drive signal generation unit 156c, NOT circuit unit 156d, division unit 156e, deviation calculation unit 156f, PI calculation unit 156g, addition unit 156h, division unit 156i, drive signal generation unit 156j, and NOT circuit The unit 156k is configured by software.

  The division unit 156a divides the voltage Vdc of the in-vehicle battery B1 obtained from the detection result of the voltage sensor 153 by the amplitude Vac_amp of the AC voltage of the AC power supply AC1 obtained from the detection result of the voltage sensor 152, and obtains Vdc / Vac_amp. It is a block to do.

  The multiplication unit 156b is a block that multiplies the output of the division unit 156a by a coefficient k to obtain and output an on-duty ratio (Vdc / Vac_amp) · k. Here, the coefficient k is set to a predetermined value of 0.9 to 1.0.

  The drive signal generator 156c is a block that outputs a pulse signal corresponding to the on-duty ratio (Vdc / Vac_amp) · k output from the multiplier 156b as the drive signal PWM3H of the IGBT 110a.

  The NOT circuit unit 156d is a block that inverts the pulse signal output from the drive signal generation unit 156c and outputs the inverted signal as the drive signal PWM3L of the IGBT 110b.

  The division unit 156e divides the target value | Iac | * of the absolute value of the alternating current supplied from the rectifier circuit 10 to the AC power supply AC1 by the on-duty ratio PWM3H_duty of the drive signal PWM3H, and | Iac | * / PWM3H_duty, This block is output as the target value IL * of the current flowing through the reactor 110i.

  Deviation calculation unit 156f calculates a deviation between target value IL * of current flowing through reactor 110i output from division unit 156e and current IL flowing through reactor 110i obtained from the detection result of current sensor 151, and outputs the result as deviation ΔIL. It is a block.

  The PI calculation unit 156g is a block that performs proportional and integral calculations on the deviation ΔIL output from the deviation calculation unit 156f, and outputs the result as a target value of the voltage at the connection point of the IGBTs 110c and 110d.

  The adder 156h feeds the output of the PI calculator 156g multiplied by the absolute value | Vac | of the AC voltage of the AC power supply AC1 obtained from the detection result of the voltage sensor 152 and the on-duty ratio PWM3H_duty of the drive signal PWM3H. This block is added as a forward term and output as a new target value V * of the voltage at the connection point of the IGBTs 110c and 110d.

  The division unit 156i divides the target value V * of the voltage output from the addition unit 156h by the voltage Vdc of the in-vehicle battery B1 obtained from the detection result of the voltage sensor 153, and obtains and outputs an on-duty ratio V * / Vdc. It is.

  The drive signal generation unit 156j is a block that outputs a pulse signal corresponding to the on-duty ratio V * / Vdc output from the division unit 156i as the drive signal PWM4H of the IGBT 110c.

  The NOT circuit unit 156k is a block that inverts the pulse signal output from the drive signal generation unit 156j and outputs the inverted signal as the drive signal PWM4L of the IGBT 110d.

  As shown in FIG. 3, the microcomputer 156 generates the drive signals PWM1H, PWM1L, PWM2H, and PWM2L of the IGBTs 100a to 100d when the direct current supplied from the in-vehicle battery B1 is converted into alternating current and supplied to the alternating current power supply AC1. Therefore, a polarity determination unit 156l, a peak detection unit 156m, a NOT circuit unit 156n, and AND circuit units 156o and 156p are provided. The polarity determination unit 156l, the peak detection unit 156m, the NOT circuit unit 156n, and the AND circuit units 156o and 156p are configured by software.

  The polarity determination unit 156l determines the polarity of the voltage Vac of the AC power supply AC1 from the detection result of the voltage sensor 152, and is high when the voltage Vac of the AC power supply AC1 is positive and when the voltage of the AC power supply AC1 is 0 or negative. This block outputs a low level.

  The peak detection unit 156m is a block that detects the timing at which the voltage Vac of the AC power supply AC1 falls within a predetermined range including the peak value from the detection result of the voltage sensor 152, and outputs a high level thereafter. Specifically, this is a block that outputs a high level when the voltage Vac of the AC power supply AC1 falls within the range of 95% to 100% of the peak value, and thereafter outputs a high level.

  The NOT circuit unit 156n is a block that inverts and outputs the output of the polarity determination unit 156l. That is, this block outputs a low level when the output of the polarity determination unit 156l is at a high level, and outputs a high level when the output of the polarity determination unit 156l is at a low level.

  The AND circuit unit 156o is a block that outputs the pulse signal output from the polarity determination unit 156l as the drive signal PWM1H of the IGBT 100a and the drive signal PWM2L of the IGBT 100d when the output of the peak detection unit 156m is at a high level.

  The AND circuit unit 156p outputs the pulse signal output from the NOT circuit unit 156n obtained by inverting the output of the polarity determination unit 156l when the output of the peak detection unit 156m is at a high level, and the drive signal PWM1L of the IGBT 100b and the drive signal PWM2H of the IGBT 100c. Is output as a block.

Next, the operation of the power converter according to the reference embodiment will be described with reference to FIGS.

  When the alternating current supplied from the alternating current power supply AC1 is converted into direct current and supplied to the in-vehicle battery B1, the microcomputer 156 shown in FIG. 1 generates and outputs drive signals PWM1H, PWM1L, PWM2H, and PWM2L that turn off the IGBTs 100a to 100d. To do.

  The drive circuit 154 stops the voltage supply to the gates of the IGBTs 100a to 100d based on the drive signals PWM1H, PWM1L, PWM2H, and PWM2L input from the microcomputer 156, and turns off the IGBTs 100a to 100d.

  The rectifier circuit 10 turns off the IGBTs 100a to 100d, converts the alternating current supplied from the alternating current power supply AC1 into direct current by the diodes 100e to 100h, and supplies the direct current to the step-up / down converter circuit 11.

  Further, the microcomputer 156 sets the IGBTs 110a to 110d at a predetermined timing based on the detection results of the current sensors 150 and 151 and the voltage sensors 152 and 153 so that the DC voltage supplied to the in-vehicle battery B1 becomes a predetermined voltage. Drive signals PWM3H, PWM3L, PWM4H, and PWM4L to be switched are generated and output.

  The drive circuit 155 supplies voltages to the gates of the IGBTs 110a to 110d based on the drive signals PWM3H, PWM3L, PWM4H, and PWM4L input from the microcomputer 156, and switches the IGBTs 110a to 110d at a predetermined timing.

  The step-up / down converter circuit 11 switches the IGBTs 110a to 110d at a predetermined timing based on the drive signals PWM3H, PWM3L, PWM4H, and PWM4L, thereby boosting or stepping down the direct current supplied from the rectifier circuit 10 to the in-vehicle battery B1. Supply. Thereby, the alternating current supplied from alternating current power supply AC1 can be converted into direct current, and can be supplied to vehicle-mounted battery B1.

  On the other hand, when the direct current supplied from the in-vehicle battery B1 is converted into alternating current and supplied to the home AC power supply AC1, the microcomputer 156 has the direct current voltage supplied to the rectifier circuit 10 instantaneously obtained from the alternating current voltage of the alternating current power supply AC1. Based on the detection results of the current sensors 150 and 151 and the voltage sensors 152 and 153, the drive signals PWM3H, PWM3L, PWM4H, and PWM4L that switch the IGBTs 110a to 110d at a predetermined timing are generated so that the voltage corresponds to the value. Output.

  The division unit 156a shown in FIG. 2 divides the voltage Vdc of the in-vehicle battery B1 obtained from the detection result of the voltage sensor 153 by the amplitude Vac_amp of the AC voltage of the AC power supply AC1 obtained from the detection result of the voltage sensor 152, and Vdc / Vac_amp is obtained and output. The multiplication unit 156b multiplies the output of the division unit 156a by a coefficient k, and obtains and outputs an on-duty ratio (Vdc / Vac_amp) · k.

  Then, the drive signal generation unit 156c outputs a pulse signal corresponding to the on-duty ratio (Vdc / Vac_amp) · k output from the multiplication unit 156b as the drive signal PWM3H of the IGBT 110a. The NOT circuit unit 156d inverts the pulse signal output from the drive signal generation unit 156c and outputs the inverted signal as the drive signal PWM3L of the IGBT 110b.

  The division unit 156e divides the target value | Iac | * of the absolute value of the alternating current supplied from the rectifier circuit 10 to the AC power supply AC1 by the on-duty ratio PWM3H_duty of the drive signal PWM3H, and | Iac | * / PWM3H_duty, It outputs as target value IL * of the current flowing through reactor 110i. Deviation calculation unit 156f calculates a deviation between target value IL * of current flowing through reactor 110i output from division unit 156e and current IL flowing through reactor 110i obtained from the detection result of current sensor 151, and outputs the result as deviation ΔIL. . The PI calculation unit 156g performs proportional and integral calculations on the deviation ΔIL output from the deviation calculation unit 156f, and outputs the result as a target value of the voltage at the connection point of the IGBTs 110c and 110d.

  The adder 156h multiplies the output of the PI calculator 156g by the absolute value | Vac | of the AC voltage of the AC power supply AC1 obtained from the detection result of the voltage sensor 152 and the on-duty ratio PWM3H_duty of the drive signal PWM3H. The values are added as a feed forward term and output as a new target value V * of the voltage at the connection point of the IGBTs 110c and 110d. The division unit 156i divides the target value V * of the voltage output from the addition unit 156h by the voltage Vdc of the in-vehicle battery B1 obtained from the detection result of the voltage sensor 153, and obtains and outputs an on-duty ratio V * / Vdc.

  Then, the drive signal generation unit 156j outputs a pulse signal corresponding to the on-duty ratio V * / Vdc output from the division unit 156i as the drive signal PWM4H of the IGBT 110c. The NOT circuit unit 156k inverts the pulse signal output from the drive signal generation unit 156j and outputs the inverted signal as the drive signal PWM4L of the IGBT 110d.

  The drive circuit 155 shown in FIG. 1 supplies voltages to the gates of the IGBTs 110a to 110d based on the drive signals PWM3H, PWM3L, PWM4H, and PWM4L input from the microcomputer 156, and switches the IGBTs 110a to 110d at a predetermined timing.

  The step-up / down converter circuit 11 switches the IGBTs 110a to 110d at a predetermined timing based on the drive signals PWM3H, PWM3L, PWM4H, and PWM4L, thereby boosting or stepping down the direct current supplied from the in-vehicle battery B1 to the rectifier circuit 10. Supply. As a result, a voltage corresponding to the instantaneous value of the AC voltage of the AC power supply AC1 is supplied to the rectifier circuit 10.

  The microcomputer 156 generates and outputs drive signals PWM1H, PWM1L, PWM2H, and PWM2L that complementarily switch the IGBTs 100a and 100d and the IGBTs 100b and 100c in synchronization with the timing at which the polarity of the voltage of the AC power supply AC1 is switched. At that time, the IGBTs 100a and 100d and the IGBTs 100b and 100c are immediately switched in a complementary manner in synchronization with the timing of switching of the polarity of the voltage of the AC power supply AC1, and the voltage of the AC power supply AC1 is within a predetermined range including the peak value. The drive signals PWM1H, PWM1L, PWM2H, and PWM2L that turn on the IGBTs 100a and 100d or the IGBTs 100b and 100c are generated from the timing at which the polarity of the voltage of the AC power supply AC1 is switched.

  The polarity determination unit 156l shown in FIG. 3 determines the polarity of the voltage Vac of the AC power supply AC1 from the detection result of the voltage sensor 152. When the voltage Vac of the AC power supply AC1 is positive, the polarity determination unit 156l is high level and the voltage of the AC power supply AC1 is 0. Or, when it is negative, a low level is output. Thereafter, the peak detection unit 156m starts operating at a predetermined timing, and when the voltage Vac of the AC power supply AC1 falls within the range of 95% to 100% of the peak value from the detection result of the voltage sensor 152, the high level is reached. After that, it outputs a high level. The NOT circuit unit 156n inverts and outputs the output of the polarity determination unit 156l.

  The AND circuit unit 156o outputs the pulse signal output from the polarity determination unit 156l as the drive signal PWM1H of the IGBT 100a and the drive signal PWM2L of the IGBT 100d when the output of the peak detection unit 156m is at a high level. The AND circuit unit 156p outputs the pulse signal output from the NOT circuit unit 156n obtained by inverting the output of the polarity determination unit 156l when the output of the peak detection unit 156m is at a high level, and the drive signal PWM1L of the IGBT 100b and the drive signal PWM2H of the IGBT 100c. Output as.

  As a result, as shown in FIG. 4, the drive signals PWM1H and PWM2L and the drive signal PWM1L are synchronized with the timing at which the polarity of the voltage of the AC power supply AC1 is switched after the time t1 when the polarity of the voltage of the AC power supply AC1 is switched. , The level of PWM2H is switched in a complementary manner. At that time, immediately before time t1, from time t2 to time t1, which is a timing at which the voltage of the AC power supply AC1 falls within a predetermined range including the peak value, specifically, within a range of 95% to 100% of the peak value. Until then, the drive signals PWM1L and PWM2H are at the high level.

  The drive circuit 154 shown in FIG. 1 supplies voltages to the gates of the IGBTs 100a to 100d based on the drive signals PWM1H, PWM1L, PWM2H, and PWM2L input from the microcomputer 156, and switches the IGBTs 100a to 100d at a predetermined timing.

  The rectifier circuit 10 switches the IGBTs 100a to 100d at a predetermined timing based on the drive signals PWM1H, PWM1L, PWM2H, and PWM2L, thereby converting the direct current supplied from the step-up / down converter circuit 11 into alternating current and supplying the alternating current power supply AC1. Supply. Thereby, the direct current supplied from vehicle-mounted battery B1 can be converted into alternating current, and can be supplied to household alternating current power supply AC1.

  By the way, in the state where the power converter device 1 is not operating, the AC voltage supplied from the AC power supply AC1 is applied to the capacitor 120b of the filter circuit 12. A direct current voltage converted by the diodes 100e to 100h of the rectifier circuit 10 is applied to the capacitor 130b of the snubber circuit 13, and the capacitor 130b is charged. Therefore, an AC voltage is applied to the AC terminal of the rectifier circuit 10, and a DC voltage is applied to the DC terminal of the rectifier circuit 10.

  When the direct current supplied from the in-vehicle battery B1 is converted into alternating current and supplied to the home alternating current power supply AC1, the control circuit 15 is time when the polarity of the voltage of the alternating current power supply AC1 is switched as shown in FIG. After t1, the IGBTs 100a and 100d and the IGBTs 100b and 100c are complementarily switched in synchronization with the timing at which the polarity of the voltage of the AC power supply AC1 is switched. At that time, immediately before time t1, from time t2 to time t1, which is a timing at which the voltage of the AC power supply AC1 falls within a predetermined range including the peak value, specifically, within a range of 95% to 100% of the peak value. The IGBTs 100a and 100d or the IGBTs 100b and 100c are turned on. In this case, the IGBTs 100b and 100c are used.

  As shown in FIG. 6, the control circuit 15 does nothing from time t0 to time t1, and after time t1, the IGBTs 100a and 100d and the IGBTs 100b and 100c are synchronized with the timing at which the polarity of the voltage of the AC power supply AC1 is switched. Are switched in a complementary manner, at time t1, there is a voltage difference between the voltage of the capacitor 120b connected to the AC terminal of the rectifier circuit 10 and the voltage of the capacitor 130b connected to the DC terminal of the rectifier circuit 10. Occur. When the IGBTs 100a and 100d are turned on in this state, an inrush current flows through a path from the capacitor 130b through the rectifier circuit 10 to the capacitor 120b immediately after the start of switching.

  However, as shown in FIG. 5, the control circuit 15 immediately before the time t1, and from the time t2 to the time t1 when the voltage of the AC power supply AC1 falls within a predetermined range including the peak value, the IGBTs 100b and 100c. Is turned on. Therefore, switching can be started in a state where the voltage difference between the voltage of the capacitor 120b connected to the AC terminal of the rectifier circuit 10 and the voltage of the capacitor 130b connected to the DC terminal of the rectifier circuit 10 is reduced. Therefore, the inrush current that occurs immediately after the start of switching can be suppressed.

Next, the effect in the power converter device of a reference form is demonstrated.

According to the reference form , when the control circuit 15 converts the direct current supplied from the in-vehicle battery B1 into alternating current and supplies it to the alternating current power supply AC1, the polarity of the voltage of the alternating current power supply AC1 is changed between the IGBTs 100a and 100d and the IGBTs 100b and 100c. The IGBTs 100a and 100d or the IGBTs 100b and 100c are set at the time t2, which is the timing immediately before the switching is performed in a complementary manner in synchronization with the time t1, which is the switching timing, and the voltage of the AC power supply AC1 is within a predetermined range including the peak value. Turn it on. Therefore, switching can be started in a state where the voltage difference between the voltage of the capacitor 120b connected to the AC terminal of the rectifier circuit 10 and the voltage of the capacitor 130b connected to the DC terminal of the rectifier circuit 10 is reduced. Therefore, the inrush current that occurs immediately after the start of switching can be suppressed.

According to the reference mode , the control circuit 15 starts the IGBT 100a from the time t2 when the voltage of the AC power supply AC1 falls within a predetermined range including the peak value to the time t1 when the polarity of the voltage of the AC power supply AC1 switches. , 100d or IGBTs 100b, 100c are turned on. Therefore, switching can be started in a state where the voltage difference between the voltage of the capacitor 120b connected to the AC terminal of the rectifier circuit 10 and the voltage of the capacitor 130b connected to the DC terminal of the rectifier circuit 10 is further reduced. Therefore, the inrush current generated immediately after the start of switching can be reliably suppressed.

According to the reference mode , the power conversion device 1 includes the filter circuit 12 that is connected between the AC power supply AC1 and the AC terminal of the rectifier circuit 10 and removes a predetermined frequency component included in the AC. A capacitor 120 b constituting the filter circuit 12 is connected in parallel to the AC terminal of the rectifier circuit 10. Therefore, an inrush current is generated due to the capacitor 120b. However, inrush current can be suppressed. Therefore, the capacitor 120b can be protected.

According to the reference mode , the power conversion device 1 has the snubber circuit 13 connected to the DC terminal of the rectifier circuit 10. A capacitor 130 b constituting the snubber circuit 13 is connected to the DC terminal of the rectifier circuit 10. Therefore, an inrush current is generated due to the capacitor 130b. However, inrush current can be suppressed. Therefore, the capacitor 130b can be protected.

According to the reference form , the snubber circuit 13 has the resistor 130a connected in series to the capacitor 130b. Therefore, the inrush current can be more reliably suppressed by the resistor 130a.

According to the reference mode , the IGBTs 100a and 100d or the IGBTs 100b and 100c are turned on at the time t2, which is the timing when the voltage of the AC power supply AC1 falls within the range of 95% to 100% of the peak value. Therefore, switching is started in a state where the voltage difference between the voltage of the capacitor 120b connected to the AC terminal of the rectifier circuit 10 and the voltage of the capacitor 130b connected to the DC terminal of the rectifier circuit 10 is reduced to a practically no problem range. can do. Therefore, the inrush current generated immediately after the start of switching can be suppressed within a practically no problem range.

( Embodiment )
Next, the power converter device of embodiment is demonstrated. Power converter of embodiment differs from the power conversion device of Reference Embodiment, the control circuit, provided with a bootstrap circuit, with it, it is a partial modification of the operation of the control circuit.

First, with reference to FIG. 7, the structure of the power converter device of embodiment is demonstrated.

  The power conversion device 2 shown in FIG. 7 is a device that converts alternating current supplied from a domestic AC power supply AC2 into direct current and supplies it to the in-vehicle battery B2. Conversely, it is also a device that converts the direct current supplied from the in-vehicle battery B2 into alternating current and supplies it to the home AC power supply AC2. The power conversion device 2 includes a rectifier circuit 20 (power conversion circuit), a buck-boost converter circuit 21, a filter circuit 22, a snubber circuit 23, a smoothing capacitor 24, and a control circuit 25.

The rectifier circuit 20 (power conversion circuit) includes IGBTs 200a to 200d (switching elements) and diodes 200e to 200h. The step-up / down converter circuit 21 includes IGBTs 210a to 210d, diodes 210e to 210h, and a reactor 210i. The filter circuit 22 includes a reactor 220a and a capacitor 220b (first capacitor). The snubber circuit 23 includes a resistor 230a and a capacitor 230b (second capacitor). The rectifier circuit 20, the buck-boost converter circuit 21, the filter circuit 22, the snubber circuit 23, and the smoothing capacitor 24 have the same configuration as the rectifier circuit 10, the buck-boost converter circuit 11, the filter circuit 12, the snubber circuit 13, and the smoothing capacitor 14 of the reference form. Therefore, the description is omitted.

The control circuit 25 includes current sensors 250 and 251, voltage sensors 252 and 253, drive circuits 254 and 255, and a microcomputer 256. The current sensors 250 and 251, the voltage sensors 252 and 253, and the drive circuit 255 have the same configuration as the current sensors 150 and 151, the voltage sensors 152 and 153, and the drive circuit of the reference form , and thus description thereof is omitted.

A configuration of a driving circuit and a microcomputer different from those of the power conversion device according to the reference embodiment will be described with reference to FIGS.

  As shown in FIG. 8, the drive circuit 254 is a circuit that drives the IGBTs 200 a to 200 d by supplying a voltage to the gates of the IGBTs 200 a to 200 d based on a drive signal input from the microcomputer 256. The drive circuit 254 includes drive circuits 254a to 254d, a power supply 254e, and bootstrap circuits 254f and 254g.

  The drive circuit 254a is a circuit that drives the IGBT 200a by supplying a voltage supplied from the bootstrap circuit 254f to the gate of the IGBT 200a based on a drive signal input from the microcomputer 256. The drive circuit 254d is connected to the bootstrap circuit 254f. Further, the microcomputer 256 and the gate of the IGBT 200a are respectively connected.

  The drive circuit 254b is a circuit that drives the IGBT 200b by supplying a voltage supplied from the power supply 254e to the gate of the IGBT 200b based on a drive signal input from the microcomputer 256. The drive circuit 254b is connected to the power source 254e. Further, it is connected to the gates of the microcomputer 256 and the IGBT 200b, respectively.

  The drive circuit 254c is a circuit that drives the IGBT 200c by supplying the voltage supplied from the bootstrap circuit 254g to the gate of the IGBT 200c based on the drive signal input from the microcomputer 256. The drive circuit 254c is connected to the bootstrap circuit 254g. Further, the microcomputer 256 and the gate of the IGBT 200c are respectively connected.

  The drive circuit 254d is a circuit that drives the IGBT 200d by supplying a voltage supplied from the power source 254e to the gate of the IGBT 200d based on a drive signal input from the microcomputer 256. The drive circuit 254d is connected to the power source 254e. Further, it is connected to the gates of the microcomputer 256 and the IGBT 200d, respectively.

  The power source 254e is a power source that supplies a voltage necessary for driving the IGBTs 200b and 200d to the drive circuits 254b and 254d. The positive terminal and the negative terminal of the power supply 254e are connected to the drive circuits 254b and 254d, respectively. The negative terminal of the power source 254e is connected to the emitters of the IGBTs 200b and 200d.

  The bootstrap circuit 254f is a circuit that is charged by the power source 254e when the low-potential-side IGBT 200b is turned on and supplies a voltage necessary for driving the high-potential-side IGBT 200a to the drive circuit 254a. The bootstrap circuit 254f includes a diode 254h and a capacitor 254i. The anode of the diode 254h is connected to the positive terminal of the power source 254e. One end of the capacitor 254i is connected to the cathode of the diode 254h, and the other end is connected to the emitter of the IGBT 200a. One end and the other end of the capacitor 254i are connected to the drive circuit 254a, respectively.

  The bootstrap circuit 254g is a circuit that is charged by the power source 254e when the low-potential-side IGBT 200d is turned on and supplies a voltage necessary for driving the high-potential-side IGBT 200c to the drive circuit 254c. The bootstrap circuit 254g includes a diode 254j and a capacitor 254k. The anode of the diode 254j is connected to the positive terminal of the power source 254e. One end of the capacitor 254k is connected to the cathode of the diode 254j, and the other end is connected to the emitter of the IGBT 200c. One end and the other end of the capacitor 254k are connected to the drive circuit 254c, respectively.

  The microcomputer 256 is an element that generates and outputs drive signals for driving the IGBTs 200a to 200d and 210a to 210d based on the detection results of the current sensors 250 and 251 and the voltage sensors 252 and 253.

  The microcomputer 256 generates and outputs drive signals PWM1H, PWM1L, PWM2H, and PWM2L for turning off the IGBTs 200a to 200d when the AC supplied from the AC power supply AC2 is converted into DC and supplied to the vehicle-mounted battery B2. Drive signals PWM3H, PWM3L for switching the IGBTs 210a to 210d at a predetermined timing based on the detection results of the current sensors 250, 251 and the voltage sensors 252, 253 so that the DC voltage supplied to the battery B2 becomes a predetermined voltage. PWM4H and PWM4L are generated and output.

  On the other hand, when the direct current supplied from the in-vehicle battery B2 is converted into alternating current and supplied to the alternating current power supply AC2, the direct current voltage supplied to the rectifier circuit 20 becomes a voltage corresponding to the instantaneous value of the alternating current voltage of the alternating current power supply AC2. In addition, based on the detection results of the current sensors 250 and 251 and the voltage sensors 252 and 253, the drive signals PWM3H, PWM3L, PWM4H, and PWM4L that switch the IGBTs 210a to 210d at predetermined timings are generated and output, and the IGBTs 200a and 200d are output. Drive signals PWM1H, PWM1L, PWM2H, and PWM2L that switch the IGBTs 200b and 200c in a complementary manner in synchronization with the timing at which the polarity of the voltage of the AC power supply AC2 is switched are generated and output.

  At that time, the IGBTs 200a and 200d and the IGBTs 200b and 200c are complementarily switched in synchronism with the timing at which the polarity of the voltage of the AC power supply AC2 is switched, and the voltage of the AC power supply AC2 is within a predetermined range including the peak value. The drive signals PWM1H, PWM1L, PWM2H, and PWM2L that turn on the IGBTs 200a and 200d or the IGBTs 200b and 200c are generated from the timing at which the polarity of the voltage of the AC power supply AC2 is switched.

  Further, at a timing when the voltage of the AC power supply AC2 falls within a predetermined range including the peak value, the IGBT 200b or IGBT 200d, which is a low potential side switching element, is turned on before the IGBT 200a, 200d or IGBT 200b, 200c is turned on. Signals PWM1H, PWM1L, PWM2H, and PWM2L are generated.

  Here, the drive signals PWM1H, PWM1L, PWM2H, and PWM2L are drive signals for the IGBTs 200a to 200d. The drive signals PWM3H, PWM3L, PWM4H, and PWM4L are drive signals for the IGBTs 210a to 210d.

  The microcomputer 256 is connected to the output terminals of the current sensors 250 and 251 and the voltage sensors 252 and 253, respectively. Further, they are connected to drive circuits 254 and 255, respectively.

  As shown in FIG. 9, the microcomputer 256 generates the drive signals PWM1H, PWM1L, PWM2H, and PWM2L of the IGBTs 200a to 200d when the direct current supplied from the in-vehicle battery B2 is converted into alternating current and supplied to the alternating current power supply AC2. Therefore, a polarity determination unit 256l, a peak detection unit 256m, a NOT circuit unit 256n, and AND circuit units 256o and 256p are provided. The polarity determination unit 256l, the peak detection unit 256m, the NOT circuit unit 256n, and the AND circuit units 256o and 256p are configured by software.

The block configuration of the polarity determination unit 256l, the peak detection unit 256m, the NOT circuit unit 256n, and the AND circuit units 256o and 256p is the same as the polarity determination unit 156l, the peak detection unit 156m, the NOT circuit unit 156n, and the AND circuit units 156o and 156p of the reference form. The block configuration is the same. However, instead of the pulse signal output from the AND circuit unit 256o, the pulse signal output from the polarity determination unit 256l is used as the drive signal PWM2L of the IGBT 200d. Other than that, the block configuration is the same as that of the microcomputer 156 of the reference embodiment , and thus the description is omitted.

Next, the operation of the power conversion device of the embodiment with reference to FIGS. 7-11.

Since the operation when the alternating current supplied from the alternating current power supply AC2 is converted into direct current and supplied to the in-vehicle battery B2 is the same as that of the power conversion device 1 of the reference form , the description is omitted. Further, when the direct current supplied from the in-vehicle battery B2 is converted into alternating current and supplied to the home AC power supply AC2, the control operation of the step-up / down converter circuit 21 is also the same as that of the power conversion device 1 of the reference embodiment. Description is omitted. The control operation of the rectifier circuit 20 in the case where the direct current supplied from the in-vehicle battery B2 is converted into alternating current and supplied to the home AC power supply AC2 will be described.

  When the direct current supplied from the in-vehicle battery B2 is converted into alternating current and supplied to the home AC power supply AC2, the microcomputer 256 shown in FIG. 7 converts the IGBTs 200a and 200d and the IGBTs 200b and 200c to the polarity of the voltage of the AC power supply AC2. Drive signals PWM1H, PWM1L, PWM2H, and PWM2L that are complementarily switched in synchronism with the switching timing are generated and output. At that time, the IGBTs 200a and 200d and the IGBTs 200b and 200c are complementarily switched in synchronism with the timing at which the polarity of the voltage of the AC power supply AC2 is switched, and the voltage of the AC power supply AC2 is within a predetermined range including the peak value. The drive signals PWM1H, PWM1L, PWM2H, and PWM2L are generated so that the IGBTs 200a and 200d or the IGBTs 200b and 200c are turned on until the timing at which the polarity of the voltage of the AC power supply AC2 is switched. Further, at a timing when the voltage of the AC power supply AC2 falls within a predetermined range including the peak value, the IGBT 200b or IGBT 200d, which is a low potential side switching element, is turned on before the IGBT 200a, 200d or IGBT 200b, 200c is turned on. Signals PWM1H, PWM1L, PWM2H, and PWM2L are generated.

  The polarity determination unit 256l shown in FIG. 9 determines the polarity of the voltage Vac of the AC power supply AC2 from the detection result of the voltage sensor 252, and when the voltage Vac of the AC power supply AC2 is positive, the polarity is high, and the voltage of the AC power supply AC2 is 0. Or, when it is negative, a low level is output. The output pulse signal is output as the drive signal PWM2L of the IGBT 200d. Based on the detection result of the voltage sensor 252, the peak detection unit 256m becomes a high level when the voltage Vac of the AC power supply AC2 falls within the range of 95% to 100% of the peak value, and thereafter outputs a high level. The NOT circuit unit 256n inverts and outputs the output of the polarity determination unit 256l.

  The AND circuit unit 256o outputs the pulse signal output from the polarity determination unit 256l as the drive signal PWM1H of the IGBT 200a when the output of the peak detection unit 256m is at a high level. The AND circuit unit 256p outputs a pulse signal output from the NOT circuit unit 256n obtained by inverting the output of the polarity determination unit 256l when the output of the peak detection unit 256m is at a high level, as a driving signal PWM1L of the IGBT 200b and a driving signal PWM2H of the IGBT 200c. Output as.

  As a result, as shown in FIG. 10, the drive signals PWM1H and PWM2L and the drive signal PWM1L are synchronized with the timing when the polarity of the voltage of the AC power supply AC2 is switched after the time t1 when the polarity of the voltage of the AC power supply AC2 is switched. , The level of PWM2H is switched in a complementary manner. At that time, immediately before the time t1, the voltage of the AC power supply AC2 is within a predetermined range including the peak value, specifically, the timing from the time t2 to the time t1 that is a timing within the range of 95% to 100% of the peak value. Until then, the drive signals PWM1L and PWM2H are at the high level. Furthermore, from time t3 before time t2 to time t2, the level of the drive signal PWM2L is switched in synchronization with the timing at which the polarity of the voltage of the AC power supply AC2 is switched.

  The drive circuit 254 shown in FIG. 7 supplies voltages to the gates of the IGBTs 200a to 200d based on the drive signals PWM1H, PWM1L, PWM2H, and PWM2L input from the microcomputer 256, and switches the IGBTs 200a to 200d at a predetermined timing.

  The rectifier circuit 20 switches the IGBTs 200a to 200d at a predetermined timing based on the drive signals PWM1H, PWM1L, PWM2H, and PWM2L, thereby converting the direct current supplied from the step-up / down converter circuit 21 into an alternating current and supplying the alternating current power supply AC2. Supply.

  As a result, when the direct current supplied from the in-vehicle battery B2 is converted to alternating current and supplied to the home AC power supply AC2, the control circuit 25 switches the polarity of the voltage of the AC power supply AC2 as shown in FIG. After the time t1, the IGBTs 200a and 200d and the IGBTs 200b and 200c are complementarily switched in synchronization with the timing at which the polarity of the voltage of the AC power supply AC2 is switched. At that time, immediately before the time t1, the voltage of the AC power supply AC2 is within a predetermined range including the peak value, specifically, the timing from the time t2 to the time t1 that is a timing within the range of 95% to 100% of the peak value. The IGBTs 200a and 200d or the IGBTs 200b and 200c are turned on. Further, from time t3 before time t2 to time t2, the IGBT 200d that is the low potential side switching element is turned on.

  When the low-potential-side IGBT 200d is turned on from time t3 to time t2, the capacitor 254k shown in FIG. 8 is connected to the power supply 254e via the diode 254j. As a result, the capacitor 254k is charged by the power source 254e, and the bootstrap circuit 254g can supply the drive circuit 254c with a voltage necessary for driving the IGBT 200c on the high potential side.

  Thereafter, the IGBT 200b on the low potential side is turned on from time t2 to time t1, whereby the capacitor 254i is connected to the power source 254e via the diode 254h. As a result, the capacitor 254i is charged by the power supply 254e, and the bootstrap circuit 254f can supply the drive circuit 254a with a voltage necessary for driving the IGBT 200a on the high potential side.

Therefore, after time t2, it can be operated in the same manner as the power conversion device 1 of the reference form . Therefore, even when the bootstrap circuits 254f and 254g are provided, the inrush current generated immediately after the start of switching can be suppressed.

Next, the effect in the power converter device of embodiment is demonstrated.

According to the embodiment, by the fact having the same configuration as the reference embodiment, it is possible to obtain the same effect as reference embodiment corresponding to the same configuration.

Furthermore, according to the embodiment , the control circuit 25 supplies the voltage necessary for driving the high-potential-side IGBT when the low-potential-side IGBT among the IGBTs constituting the rectifier circuit 20 is turned on. 254g. When the direct current supplied from the in-vehicle battery B2 is converted into alternating current and supplied to the home AC power supply AC2, the IGBT 200a is at time t2, which is the timing at which the voltage of the AC power supply AC2 falls within a predetermined range including the peak value. , 200d or IGBTs 200b and 200c are turned on, the IGBT 200d which is a low-potential side switching element is turned on. Therefore, a voltage necessary for driving the high-potential-side IGBT 200c can be supplied to the drive circuit 254c. Therefore, after time t2, it can be operated in the same manner as the power conversion device 1 of the reference embodiment , and even when the bootstrap circuits 254f and 254g are provided, the inrush current generated immediately after the start of switching can be suppressed.

DESCRIPTION OF SYMBOLS 1 ... Power converter device, 10 ... Rectifier circuit (power converter circuit), 100a-100d ... IGBT (switching element), 100e-100h ... Diode, 11 ... Buck-boost converter circuit (DC) 110a ... 110d ... IGBT, 110e-110h ... diode, 110i ... reactor, 12 ... filter circuit, 120a ... reactor, 120b ... capacitor (first capacitor), 13 ... Snubber circuit, 130a ... Resistance, 130b ... Capacitor (second capacitor), 15 ... Control circuit, AC1 ... AC power supply, B1 ... In-vehicle battery (DC power supply)

Claims (6)

Four switching elements connected in reverse parallel are connected by a bridge, and the switching element is turned off to convert the alternating current supplied from the alternating current power source connected to the AC terminal into direct current by the diode. A power conversion circuit (20) that supplies a DC power source connected to a DC terminal or converts the DC supplied from the DC power source to an AC by switching the switching element and supplies the AC to the AC power source; ,
A first capacitor (220b) connected in parallel to the AC terminal of the power conversion circuit;
A second capacitor (230b) connected in parallel to the DC terminal of the power conversion circuit;
When the alternating current supplied from the alternating current power supply is converted to direct current and supplied to the direct current power supply, the switching element of the power conversion circuit is turned off and the direct current supplied from the direct current power supply is connected to the power conversion circuit. Is converted into alternating current and supplied to the alternating-current power supply, among the switching element pairs composed of the switching elements arranged diagonally of the power conversion circuit, the switching element constituting one switching element pair and the other A control circuit (25) for switching the switching elements constituting the switching element pair in a complementary manner in synchronization with a timing at which the polarity of the voltage of the AC power supply is switched;
In a power conversion device comprising:
The control circuit supplies a voltage required for driving the switching element on the high potential side by turning on the switching element on the low potential side among the switching elements constituting the power conversion circuit (254f). 254g), when the direct current supplied from the direct current power source is converted into alternating current and supplied to the alternating current power source, the switching element constituting the one switching element pair and the other switching element pair are The switching element to be configured is immediately before complementary switching in synchronization with the timing at which the polarity of the voltage of the AC power supply is switched, and at a timing at which the voltage of the AC power supply falls within a predetermined range including a peak value, The switching element constituting one switching element pair or the other switching element The switching element constituting the element pair is turned on, and at the timing when the voltage of the AC power source falls within the predetermined range including a peak value, the switching element constituting the one switching element pair, or the other a just before turning on the switching element constituting the switching element pairs, before the timing at which the polarity of the voltage of the AC power supply is switched, one which turns on the switching element on the low potential side, the voltage of the AC power supply peak When turning on the switching elements constituting the one switching element pair at a timing that falls within the predetermined range including a value, the one at a timing when the voltage of the AC power source falls within the predetermined range including a peak value The switching elements constituting the switching element pair are directly turned on. The switching element constituting the one switching element pair and the switching element constituting the other switching element pair are complementarily switched in synchronism with the timing at which the polarity of the voltage of the AC power supply is switched. When the AC power supply voltage is before the half cycle before the AC and the polarity of the AC power supply is opposite to the polarity from the timing when the AC power supply is started complementary to the half cycle before the AC. The switching element constituting the other switching element pair is turned on at a timing when the switching element on the low potential side of the other switching element pair is turned on and the voltage of the AC power supply falls within the predetermined range including a peak value. When turning on, the timing at which the voltage of the AC power supply falls within the predetermined range including the peak value And immediately before turning on the switching element constituting the other switching element pair, the switching element constituting the one switching element pair, and the switching element constituting the other switching element pair, From the timing at which switching is started complementarily in synchronization with the timing at which the polarity of the voltage of the AC power supply is switched, from before the half cycle before the AC, and from the timing at which the voltage of the AC power supply starts to switch complementarily. A power converter that turns on the switching element on the low potential side of the one switching element pair when the polarity is opposite to the polarity up to 1/2 cycle before the alternating current .   The control circuit comprises the switching elements constituting the one switching element pair from a timing when the voltage of the AC power supply falls within the predetermined range including a peak value to a timing when the polarity of the voltage of the AC power supply is switched, or The power conversion device according to claim 1, wherein the switching elements constituting the other pair of switching elements are turned on. A filter circuit (22) connected between the AC power source and the AC terminal of the power conversion circuit, for removing a predetermined frequency component included in the AC;
The power converter according to claim 1 or 2, wherein the first capacitor (220b) is an element constituting the filter circuit. A snubber circuit (23) connected to the DC terminal of the power conversion circuit;
The power converter according to any one of claims 1 to 3, wherein the second capacitor (230b) is an element constituting the snubber circuit.   The power converter according to claim 4, wherein the snubber circuit (23) includes a resistor (230a) connected in series to the second capacitor.   The power converter according to claim 1, wherein the predetermined range is a range of 95% to 100% of a peak value.