Patent ID: 6281636
Filing Date: 2001-08-28
Classification: H02M,H05B,Y02B

Abstract:
A neutral point inverter comprising:a low-pass filter for passing a basic frequency of alternating current and filtering out a harmonic signal;a rectifier for rectifying alternating voltage passed through said low-pass filter;a series circuit consisting of first and second capacitors connected to an output of said rectifier;a third capacitor for smoothing the output of said rectifier;a series circuit consisting of first and second switching elements connected to the output of said rectifier;first and second diodes connected in parallel to said first and second switching elements so that direct current through said first diode and direct current through said second diode become opposite in direction;a drive circuit for driving said first and second switching elements; anda load circuit connected between a connecting point which is between said first and second capacitors and a connecting point which is between said first and second switching elements, said connecting point between said first and second capacitors being connected to an alternating current input of said rectifier, and alternating current power being supplied to said load circuit by alternately turning said first and second switching elements on and off;wherein said load circuit includes an inductor and a load connected in parallel with said inductor, said alternating current power being supplied across said load by voltage that is generated across said inductor.