Patent ID: 6091615
Filing Date: 2000-07-18
Classification: H02M,Y02B

Abstract:
A resonant power converter comprising:a positive bus line (1A);a negative bus line (1B);a power converting portion (2) connected between a DC power source (1) and a load (5) for implementing power conversion, the power converting portion including a plurality of main switching devices (3a-3f) connected in series and provided between the positive bus line and the negative bus line, and a plurality of flywheel diodes (4a-4f) connected in antiparallel with the main switching devices respectively for each phase;a resonant circuit (8) connected between the positive bus line and the negative bus line, and including a resonant capacitor (6) and a resonant reactor (7) connected in series with the resonant capacitor; andcontrol means (13) for switching the main switching devices in accordance with a predetermined pattern to enable the power converting portion to implement power conversion;wherein the control means turns on a first switching device which should turn on based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices to start resonance to be implemented by the resonant capacitor and the resonant reactor, and the control means turns off a second switching device which should turn off based on the gate signal command, the output signal of the gate signal circuit, among the main switching devices when a resonant current caused by the resonance is greater than a load current and hence a current flows through one of the flywheel diodes which is connected in antiparallel with the second switching device.