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1. (WO2016060541) OVERVOLTAGE PROTECTION

Pub. No.:    WO/2016/060541    International Application No.:    PCT/MY2015/000003
Publication Date: Fri Apr 22 01:59:59 CEST 2016 International Filing Date: Tue Jan 13 00:59:59 CET 2015
IPC: H02H 9/00
G05F 1/46
H02H 9/02
H02H 9/04
H03K 17/08
Applicants: O.Y.L. TECHNOLOGY SDN BHD
Inventors: TAN, Ching Hau
Title: OVERVOLTAGE PROTECTION
Abstract:
The present invention provides an overvoltage protection circuitry for a switching mode power supply (SMPS) DC BUS of an electrical appliance which comprises a field-effect transistor (Q01) to function as a switch for controlling electric current and regulating voltage from a power input supply, a zener diode (TVS1), a resistor (R02) for resisting current into the transistor that will gradually turn on the transistor when a sudden input voltage is higher than a threshold voltage of the zener diode, wherein the transistor will conduct current across the drain to the source of the transistor. An electrolytic capacitor (E01) is added across the transistor's gate and source to form a gate charging circuit to allow the switching mode power supply DC Bus to be slowly charged up.