Patent ID: 8106901

Claim:
A power circuit, comprising: a pulse width modulation (PWM) circuit configured for generating a pulse wave signal, a first control signal, and a second control signal, the pulse width modulation circuit comprising a pulse wave pin, a first control pin, and a second control pin; a switching mode voltage stabilizer circuit configured for receiving the pulse wave signal via the pulse wave output pin, and converting an external input voltage into a first direct voltage under control of the pulse wave signal; a first control circuit configured for receiving the first control signal via the first control pin; and a second control circuit configured for receiving the first direct voltage and the second control signal via the second control pin, and converting the first direct voltage into a second direct voltage; wherein the first control circuit controls whether the first direct voltage is applied to a first load according to a voltage level of the first control signal, and the second control circuit controls whether the second direct voltage is applied to a second load according to an voltage level of the second control signal.