JP2016052198A5 - - Google Patents

Claims (21)

A power conversion main circuit having two or more switching units;
A gate driver for driving each of the switching units;
An impedance element connected between the gate driving units;
A power converter comprising: a detection unit that detects a voltage or a current of the impedance element.   The switching unit includes a first switching unit as a positive electrode side and a second switching unit as a negative electrode side connected in series to the first switching unit, and the gate driving unit includes the first switching unit. A first gate driving unit that drives the second switching unit and a second gate driving unit that drives the second switching unit, wherein the impedance element includes the first gate driving unit and the second gate driving unit. The power conversion device according to claim 1, wherein the power conversion device is connected to a power supply unit.   The switching unit includes a first switching unit as one of three phases and a second switching unit as another phase, and the gate driving unit is configured to drive the first switching unit. And a second gate driving unit that drives the second switching unit, and the impedance element is connected between the first gate driving unit and the second gate driving unit. The power converter according to claim 1, wherein:   The power converter according to claim 2, further comprising a control unit that controls the gate driving unit in accordance with a signal from the detection unit.   Each of the first switching unit and the second switching unit includes one switching element, and each of the first gate driving unit and the second gate driving unit includes one gate driving circuit. The power conversion device according to claim 4, wherein the power conversion device is provided corresponding to the switching element and outputs a two-level voltage. The control unit corrects an output voltage signal based on a signal from the detection unit, and adds a dead time to the drive signal of the switching element on the positive side of the output voltage signal to add the dead time to the positive side. A first additional circuit that outputs to the gate drive circuit that drives the switching element; and a dead time is added to the inverted drive signal of the switching element on the negative electrode side of the output voltage signal to cause the switching element on the negative electrode side to The power conversion device according to claim 5, further comprising: a second additional circuit that outputs to the gate drive circuit to be driven.   Each of the first switching unit and the second switching unit is configured by connecting two switching elements in series, and each of the first gate driving unit and the second gate driving unit includes two gate drives. The power converter according to claim 4, wherein a circuit is provided corresponding to each of the switching elements and outputs a three-level voltage.   The impedance element drives the gate driving circuit that drives the switching element on the lower potential side of the two switching elements on the positive electrode side, and drives the switching element on the lower potential side of the two switching elements on the negative electrode side The power converter according to claim 7, wherein the power converter is connected to the gate driving circuit.   The control unit is configured to output an output voltage signal to each gate driving circuit that drives the switching element on the higher potential side of the switching element on the positive electrode side and the switching element on the negative electrode side based on a signal from the detection unit. And detecting the output voltage signal to each of the gate drive circuits for driving the switching elements on the lower potential side of the switching element on the positive electrode side and the switching element on the negative electrode side. A second correction circuit that performs correction based on a signal from the unit, and a dead time is added to the drive signal of the switching element on the higher potential side on the positive side of the output voltage signal from the first correction circuit. A first additional circuit for outputting to the gate drive circuit for driving the switching element on the positive potential side upper potential side, and the first correction circuit A dead time is added to the inverted drive signal of the switching element on the higher potential side on the negative electrode side of the output voltage signal, and the output signal is output to the gate drive circuit that drives the switching element on the higher potential side on the negative electrode side. And adding the dead time to the drive signal of the switching element on the lower potential side on the positive side of the output voltage signal from the second correction circuit, and the switching on the lower potential side on the positive side A third additional circuit that outputs to the gate drive circuit that drives the element; and a dead time in an inverted drive signal of the switching element on the lower potential side on the negative side of the output voltage signal from the second correction circuit And a fourth additional circuit for outputting to the gate drive circuit for driving the switching element on the lower potential side on the negative electrode side. Power converter according to claim 8 that.   10. The power conversion device according to claim 6, wherein the control unit is connected to each of the gate drive circuits and the detection unit via an insulating circuit.   The power conversion device according to any one of claims 5 to 10, wherein the impedance element is one resistor or two or more resistors connected in series.   The power converter according to any one of claims 5 to 10, wherein the impedance element is one capacitor or two or more capacitors connected in series.   11. The power conversion device according to claim 5, wherein the impedance element is one diode or two or more diodes connected in series.   The power converter according to any one of claims 5 to 13, wherein each of the gate drive circuits and the impedance element are disposed on the same substrate.   A first signal line connecting the switching element on the positive electrode side and the corresponding gate drive circuit, and a second signal line connecting the switching element on the negative electrode side and the gate drive circuit corresponding to the switching element. The power converter according to any one of claims 5 to 14, wherein the first signal line and the second signal line are disposed adjacent to each other.   A connection portion of the gate drive circuit that drives the impedance element and the positive-side switching element is provided in the vicinity of a connection portion of the first signal line and the gate drive circuit that drives the positive-side switching element. A connecting portion of the gate driving circuit for driving the impedance element and the negative-side switching element is provided in the vicinity of a connecting portion of the gate driving circuit for driving the second signal line and the negative-side switching element; The power converter according to claim 5, wherein the power converter is provided.   17. The power conversion device according to claim 5, wherein each of the switching elements includes an IGBT, a MOSFET, or a bipolar transistor.   The power conversion device according to any one of claims 5 to 17, wherein the switching element on the positive electrode side and the switching element on the negative electrode side are formed of a 2-in-1 module. Wherein each switching unit, a power conversion device according to any one of claims 1 to 18, characterized by using a wide band gap semiconductor.   The power converter according to claim 19, wherein the wide band gap semiconductor is a semiconductor using silicon carbide, a gallium nitride-based material, or diamond. Using an impedance element connected between a first gate driving unit for driving the first switching unit and a second gate driving unit for driving the second switching unit, the voltage or current of the impedance element is The voltage detection method of the power converter device which detects the voltage between a 1st switching element and a 2nd switching element by detecting.