SINGLE STAGE BOOST-ASYMMETRIC LLC

摘要

An AC/DC power converter utilizing a single stage boost-asymmetric LLC topology is disclosed. The converter uses a combined pulse width modulation (PWM) and frequency modulation (FM) to achieve dual control for a single main magnetic element (transformer). The transformer provides an output voltage regulation throughout the primary-secondary isolation operating in resonant mode (LLC) by means of frequency modulation, while at the same time its magnetizing inductance is conditioning the input current and providing a boosted high voltage for energy storage purpose by means of duty cycle control. A single pair of complementary primary switches is used to drive the primary winding of the transformer in order to achieve both voltage regulation and power conditioning. The secondary side capacitors and the resonant inductor, which may be either integrated into the transformer or external to the transformer, achieve the resonant function of the transformer.

主权项

1. A single stage boost-asymmetric LLC AC/DC power switching converter, the converter comprising:
a bridge rectifier, the bridge rectifier receiving an external AC (alternating current) power for conversion into a rectified DC (direct current) power; and a power stage, the power stage receiving the rectified DC power for conversion into an output DC power, the power stage comprising:
a high frequency magnetic transformer, the high frequency magnetic transformer comprising a primary winding and a secondary winding,a pair of complementary switches,a resonant tank, the resonant tank comprising a resonant inductor and a pair of resonant capacitors, anda high voltage storage capacitor,
wherein the pair of complementary switches, the resonant inductor, and the high voltage storage capacitor are disposed on a primary winding side of the power stage,wherein the pair of resonant capacitors is disposed on a secondary winding side of the power stage.