OVER VOLTAGE PROTECTION DEVICE FOR ELECTRONIC DEVICES WITH HIGH VOLTAGE DC POWER SUPPLY

摘要

: The various embodiments of the invention provide an over voltage protection device for an electronic device with high voltage DC power supply. The device has a P channel MOSFET with its control terminal connected to the negative terminal of a DC power source through a resistance A PNP transistor and a first Zener diode ate connected to the gate to source of the MOSFET. A second Zener diode is connected to the base of the transistor. Under normal operating condition, the transistor is switched off to switch on the MOSFET to supply the power to the load. Under the overvoltage condition, the transistor is switched on to switch off the MOSFET to prevent the power supply to the load. A micro controller interface through a NPN transistor is provided to control the load independent of the input voltage level. No. of Pages : 30 No. of Claims : 25