Patent ID: 9312688
Filing Date: 2016-04-12
CPC Classification: H02H,H02J,H02M

Claim Text:
1. A power supply protection system comprising: a first metal oxide field effect transistor (MOSFET) having a first source, a first drain coupled to an input node, and a first gate; a second MOSFET having a second source coupled to the first source, a second drain coupled to an output node and a second gate coupled to the first gate, whereby the first MOSFET and the second MOSFET are coupled back-to-back; a zener diode coupled between the first and second sources and the first and second gates; charge pump circuitry coupled across the zener diode, whereby a voltage on the first and second gates is boosted with respect to the voltage on the first and second sources; and a first protection circuit coupled between the charge pump circuitry and the first and second gates and a second protection circuit coupled between the charge pump circuitry and the first and second sources.