Patent ID: 7151680
Filing Date: 2006-12-19
Classification: H02M

Abstract:
1. A switching power supply circuit comprising: a rectifier for receiving an AC voltage; a first smoothing capacitance having a first terminal connected with a first output terminal of the rectifier, wherein V a second smoothing capacitance having a first terminal connected with a second output terminal of the rectifier, wherein a second terminal of the first smoothing capacitance is connected with a second terminal of the second smoothing capacitance, wherein V a first resistance R a second resistance R a transformer having a first terminal of a primary winding connected with the first terminal of the first smoothing capacitance; a PWM control circuit having a DC power supply input, wherein the PWM control circuit performs switching control of a switch connected with a second terminal of the primary winding of the transformer such that the switching power supply circuit outputs a DC voltage of different voltage specifications; and a third resistance R