Patent ID: 8786205
Filing Date: 2014-07-22
Classification: H05B

Abstract:
1. A circuit, comprising: a first switch in a boost circuit, the first switch being switched on and off to transfer electric energy from an input power supply to a capacitor to generate an intermediate power supply having a higher voltage than the input power supply; a second switch in a buck circuit to provide a first driving voltage based on the intermediate power supply to drive a first load device, the second switch being switched on and off to regulate a first current to the first load device, the buck circuit including a first diode and a first inductor, the second switch and the first diode being serially coupled between the intermediate power supply and a ground, the first inductor being coupled between the first diode and the first load device; a third switch in the buck circuit to provide a second driving voltage based on the intermediate power supply to drive a second load device, the third switch being switched on and off to regulate a second current to the second load device, the buck circuit including a second diode and a second inductor, the third switch and the second diode serially coupled between the intermediate power supply and the ground, the second inductor being coupled between the second diode and the second load device; and a controller configured to provide a first signal to the first switch, a second signal to the second switch, a third signal to the third switch to switch on and off the first switch, the second switch, and the third switch.