Power converter

Details Power converter Power converter

H - Electricity

02

M

H02M 7/44 (2006.01) H02M 5/45 (2006.01) H02M 7/48 (2006.01)

Patent

CA 2178857

A power converter including, a converter, a three-level DC voltage source composed of a series connected capacitors connected between outputs of the converter to generate a positive, a neutral and a negative potential, a three-level NPC inverter , a chopper circuit, and a chopper control circuit. The chopper circuit includes a series circuit of a first and a second switching device connected between a positive and a negative potential pointsof the three-level DC voltage source, a first and a second diode connected in antiparallel with the first and second switching devices, respectively, and a reactor connected between a neutral potential point and a connecting point of the first and second switching devices. The chopper control circuit includes a first and a second voltage detector for detecting a first and a second voltages between the capacitors, respectively, a voltage controller for comparing the first and second voltages and for generating a voltage control output signal so that a voltage difference becomes zero, and a control circuit for driving the first and second switching devices based on the voltage control output signal. Whereby the fluctuation of the neutral potential of the three-level DC power source is suppressed. 71

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