Protection circuit protecting against voltage irregularities

Details Protection circuit protecting against voltage irregularities Protection circuit protecting against voltage irregularities

2005-06-21

2005-06-21

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

C307S127000

Reexamination Certificate

active

06909585

ABSTRACT:
Protection circuits (1) to be located between power supplies (2) and further circuitries (20,30) for protecting further circuitries (20,30) against voltage irregularities and comprising main transistors (7) coupled to switching circuits (10) for rendering main transistors (7) operative
on-operative can be made more allround by providing them with comparators (11) for controlling gate voltages of main transistors (7) via switches (12,13) to get protection against small negative voltage pulses and voltage fluctuations. Said switches (12,13) comprise two switches (12,13) for interrupting a reference voltage generated by a reference voltage source and for supplying a nearby ground voltage to said gate. A diode (14) between switch (13) and gate allows negative voltages at said gate for simplifying the introduction of further stages. Thick oxide transistors (15) protect further circuitries (20,30) and main transistors (7) against large negative voltage pulses. Capacitors (16) and resistors (17) coupled parallelly to thick oxide transistors (15) protect against large negative voltage pulses and reverse polarity. Serial transistors (21) are coupled anti-serially to main transistors (7) to get protection against large positive voltage pulses.

REFERENCES:
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patent: 4992683 (1991-02-01), Robin, Jr.
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patent: 10001485 (2001-07-01), None
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patent: 0629031 (1994-12-01), None
Davis, “Overload and reverse—Current Circuitry protects battery and load”, EDN, Mar. 1, 1996, vol. 41, No. 5, pp 165-168.

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