Patent ID: 7965525
Filing Date: 2011-06-21
Classification: H02M,H02P,H03H

Abstract:
1. A pulse-width-modulation (PWM) direct current (DC) steady-state output circuit, comprising: an electronic switch having a signal input end, via which a PWM signal is input, and a high-level end; and a resistor-capacitor (RC) integrating filter consisting of at least one RC filtering unit and a first protection unit; wherein there can be (1+n) order(s) of RC filtering unit(s) with a first-order RC filtering unit connected to the electronic switch and the first protection unit and the rest n orders of RC filtering units selectively connected to the first-order RC filtering unit; the n orders of RC filtering units are sequentially connected to a preceding order of RC filtering unit one by one; and, when the electronic switch has signals input thereto, the RC filtering unit of the RC integrating filter at each of the orders makes feedback compensation to a level of a preceding order of RC filtering unit, so that a steady-state DC level is output.