Rabin & Berdo, P.C.
Control apparatus of switching power supply for generating drive signal of incremental on-width
A control apparatus of a current resonance type switching power supply that has a switching element and generates an output voltage. The control apparatus includes a drive circuit configured to generate a drive signal to drive the switching element of the switching power supply, and a soft-start control circuit connected to the drive circuit, the soft-start control circuit being configured to send a signal to the drive circuit to cause the drive circuit to increment an on-width of the drive signal by a prescribed step per prescribed switching number, to thereby reduce an overshoot of the output voltage when the switching power supply is started.
FUJI ELECTRIC CO., LTD.
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Kiminori Jian
Tanaka Chen