PULSE WIDTH MODULATION CONTROL CIRCUIT HAVING DUAL LOOPS

Abstract: a pulse width modulation control circuit for controlling a power converter circuit includes: a main loop control circuit; and a light-load loop control circuit. the light-load loop control circuit includes a current synthesis circuit configured to generate a synthesized current signal according to an input voltage and a target value of an output voltage and an inductance value of an inductor in a power stage circuit of the power converter circuit. the light-load loop control circuit generates a pulse modulation signal in light-load mode according to the synthesized current signal, to control a duty ratio of the power stage circuit. in the light-load mode, the main loop control circuit enters a power-saving state to reduce the power consumption of the pulse width modulation control circuit. the power-saving state includes: reducing the power consumption of the current sense circuit or stopping the operation of the current sense circuit.

Inventor(s): Kai-Yu HU, Cheng-Hsuan FAN, Yung-Jen CHEN, Chien-Hui WANG

CPC Classification: H02M3/1586 (APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers ; dynamo-electric converters ; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters ))

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