Patent ID: 9263943
Filing Date: 2016-02-16
CPC Classification: G09G,H02M,Y02B

Claim Text:
1. A power supply circuit comprising a load, a DC power supply, a DC booster circuit, a load feedback circuit and a control circuit, wherein the DC power supply is configured to output a DC voltage to the DC booster circuit; the DC booster circuit is configured to receive the DC voltage from the DC power supply, boost the DC voltage to obtain a boosted voltage, and output the boosted voltage to the load; the load feedback circuit is configured to receive a current passing through the load, generate a converted voltage in accordance with the current, integrate the converted voltage to generate an integrated voltage, generate a first triggering signal in accordance with the integrated voltage, and output the first triggering signal to the control circuit, wherein the first triggering signal is of a certain period, and its frequency is in direct proportion to the current passing through the load; and the control circuit is configured to receive the boosted voltage from the DC booster circuit, generate a second triggering signal in according with the boosted voltage, a DC power supply voltage and a reference voltage, receive the first triggering signal from the load feedback circuit, generate a switching signal for controlling the operation of the DC booster circuit in accordance with the first triggering signal and the second triggering signal, and output the switching signal to the DC booster circuit.