US 7,321,223 B2 | ||
Switching power supply apparatus | ||
Yoshiaki Hachiya, Ohtsu (Japan) | ||
Assigned to Matsushita Electric Industrial Co., Ltd., Osaka (Japan) | ||
Filed on Oct. 27, 2004, as Appl. No. 10/973,916. | ||
Claims priority of application No. 2003-368855 (JP), filed on Oct. 29, 2003. | ||
Prior Publication US 2005/0094341 A1, May 05, 2005 | ||
Int. Cl. G05F 1/613 (2006.01); G05F 1/40 (2006.01) |
U.S. Cl. 323—224 [323/266; 323/285] | 26 Claims |
1. A switching power supply apparatus comprising:
a switching device for turning ON/OFF a first DC voltage,
a conversion circuit for converting the output of said switching device into a second DC voltage,
a control circuit for controlling said switching device,
a voltage detection circuit for detecting the output voltage of said conversion circuit,
a V-I conversion circuit for generating a current signal corresponding to the change in the output voltage of said voltage
detection circuit, and
an I-V conversion circuit for outputting a voltage corresponding to the current signal of said V-I conversion circuit, for
PWM controlling the switching operation of said switching device using said control circuit and for stopping and restarting
the switching operation of said switching device.
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