Patent ID: 7502233
Filing Date: 2009-03-10
Classification: H02M

Abstract:
1. A power supply for AC/DC and DC/DC conversion comprising: an AC input; a DC input; a single switch for selecting AC input power or DC input power; a DC output; and a circuit used for AC/DC and DC/DC conversion which converts the power input from the AC input or the DC input to DC power, wherein the single switch is connected to a secondary side of a transformer for AC/DC conversion inside the circuit for AC/DC and DC/DC conversion, and the secondary side serves as an inductor for performing DC/DC conversion when the DC input power is selected, and wherein the circuit used for AD/DC and DC/DC conversion includes: an AC/DC conversion circuit including: a rectifier electrically connected between the AC input and the transformer; and a first pulse width modulation controller electrically connected to the transformer; and a DC/DC conversion circuit including a second pulse width modulation controller electrically connected to the secondary side of the transformer.