Patent ID: 6115275
Filing Date: 2000-09-05
Classification: H02M

Abstract:
A bridge-type inverter circuit in which a load is connected between a connection point between a first switching unit and a second switching unit, and a connection point between a third switching unit and a fourth switching unit, said first and second switching units are connected symmetrically to said third and fourth switching units about the load, all said switching units are driven by a mono power source, comprising:low frequency drive signal providing means for providing a low frequency drive signal indicating an inverse relationship between said first and fourth switching units and said second and third switching units;delay means for delaying supply of a low frequency drive signal when said low frequency drive signal providing means provides the low frequency drive signal;first high frequency drive signal providing means for providing a high frequency drive signal for said second switching means when the second switching means is driven according to the low frequency drive signal; andsecond high frequency drive signal providing means for providing a high frequency drive signal for the fourth switching means when the fourth switching means is driven according to the low frequency drive signal,wherein said delay means delays a turning-on operation of one of said first and fourth switching means and said second and third switching means for a predetermined time at a starting stage of switching a low frequency signal.