Patent ID: 6574081
Filing Date: 2003-06-03
Classification: H02H,H02M

Abstract:
A DC-DC converter comprising:a primary-side circuit connecting to a DC power supply and provided with a converter performing a conversion operation converting a voltage supplied by said DC power supply into an AC signal; a secondary-side circuit for rectifying and smoothing the AC signal supplied by said primary-side circuit to supply power to a load; and an auxiliary rectifying and smoothing circuit rectifying and smoothing the AC signal supplied by said primary-side circuit to supply sub-power supply voltage to said converter of said primary-side circuit; wherein, said primary-side circuit includes a monitor circuit monitoring the sub-power supply voltage supplied from said auxiliary rectifying and smoothing circuit to said converter and a latch circuit for latching the conversion operation of said converter into an OFF state; and an operation control circuit provided with an operation control terminal for stopping the conversion operation of said conversion circuit according to a signal provided to said operation control terminal and for preventing latching by said latch circuit during stopping of the conversion operation by the signal provided to the operation control terminal.