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1. (WO2016049988) SMART MATCHING STEP-DOWN CIRCUIT AND TRAVEL-USE POWER CONVERSION DEVICE

Pub. No.:    WO/2016/049988    International Application No.:    PCT/CN2014/095206
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Sat Dec 27 00:59:59 CET 2014
IPC: H02M 5/40
Applicants: SHENZHEN MAORUN ELECTRIC CO., LTD
深圳市茂润电气有限公司
Inventors: XU, Xinhua
徐新华
Title: SMART MATCHING STEP-DOWN CIRCUIT AND TRAVEL-USE POWER CONVERSION DEVICE
Abstract:
Provided is a smart matching step-down circuit, comprising an alternating current input terminal (10), a rectifier filter circuit (20), a switching circuit (30), a high voltage BUCK control step-down circuit (40), a floating zero potential control circuit (41), a voltage detection and feedback circuit (50), a PWM controller (52), a full-bridge DC/AC converter circuit (60), an alternating current output terminal (70), an output voltage detection circuit (62), and a conversion controller (80); the high voltage BUCK control step-down circuit comprises a step-down inductor (L1) and a step-down capacitor (C18); the first end of the step-down inductor is connected to the output terminal of the switching circuit; the second end of the step-down inductor is connected to the positive electrode of the step-down filter capacitor, and is used for stepping down and filtering the pulse voltage, then outputting a second direct current; the floating zero potential control circuit comprises a flyback diode (D11, D12); the cathode of the flyback diode is connected to the circuit ground, together with the first end of the step-down inductor; the anode of the flyback diode is connected to the floating ground (GND), together with the negative electrode of the step-down filter capacitor; the smart matching step-down circuit can step down a wide voltage, and is broadly adaptable.