Over-voltage protection circuit

Details Over-voltage protection circuit Over-voltage protection circuit

2011-04-12

2011-04-12

Patel, Dharti H (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S091100, C361S091700, C307S127000, C307S138000

Reexamination Certificate

active

07924540

ABSTRACT:
A main transistor and a reverse current prevention transistor are provided in series between an input terminal and an output terminal. An input diode is provided between a connection point of the reverse current prevention transistor and the main transistor and a reference voltage terminal in such a direction that the anode becomes the reference voltage terminal side. A control unit controls the gate voltage of the main transistor according to a DC voltage. The reverse current prevention transistor is arranged in such a direction that the anode of its body diode becomes the input terminal side. The reverse current prevention transistor is biased to be turned on in a normal state that the input terminal becomes high potential and the reference voltage terminal becomes low potential.

REFERENCES:
patent: 5726505 (1998-03-01), Yamada et al.
patent: 7751157 (2010-07-01), Migliavacca
patent: 2009/0091872 (2009-04-01), Ueda
patent: 9-219935 (1997-08-01), None

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