Patent ID: 9590487
Date: 2017-03-07
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A circuit for reducing a ripple of a current output by a current source, wherein an output terminal of the current source is connected to a load and a current output by the current source has a ripple, wherein the circuit comprises an adjustable impedance tube and a control circuit; the adjustable impedance tube is connected in series with the load through a first terminal and a second terminal of the adjustable impedance tube, and a control terminal of the adjustable impedance tube is connected to an output terminal of the control circuit; and the control circuit is configured to, acquire a direct current output by the current source and obtain a first signal in proportion to the direct current; acquire an average value of the direct current output by the current source and obtain a setting signal associated with the average value of the direct current; and output a control signal for increasing an impedance of the adjustable impedance tube in a case that an instantaneous value of the first signal is sensed to be greater than an amplitude value of the setting signal; wherein the control signal adjusts the impedance of the adjustable impedance tube through controlling a voltage or a current at the control terminal of the adjustable impedance tube.