Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1995-10-30
1996-08-13
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361 86, 361 91, H02H 700
Patent
active
055462600
ABSTRACT:
A protection circuit for a semiconductor switch for switching a load is disclosed. Control circuitry is used for switching the semiconductor switch on in response to a switching signal and for switching the semiconductor switch off in response to a deactivation signal. A deactivation circuit is used for generating the deactivation signal. An overvoltage detector circuit responsive to a voltage at an output of the semiconductor switch that exceeds a predetermined value is used for generating an overvoltage signal. The overvoltage detector circuit includes a Zener diode that has its cathode coupled through a resistor to the output of the semiconductor switch and its anode coupled to the collector of the diode connected transistor. A first logic circuit is used for causing the deactivation circuit to generate the deactivation signal in response to the switching signal and the overvoltage signal. The first logic circuit includes a first npn transistor that has its base coupled through a resistor to receive the switching signal. A second npn transistor receives the overvoltage signal through a resistor at its base. The collector of the first npn transistor is coupled to the collector of the second npn transistor. A third npn transistor has its base coupled to the collector of the second npn transistor. A first pnp transistor has its base coupled to the collector of the third npn transistor. One of the two collectors is coupled to the deactivation circuit.
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Robert Allen Pease, "Declaration Of Robert Allen Pease Under 37 C.F.R. .sctn. 1.68", dated Nov. 4, 1994, pp. 1-6.
Robin Shields, "Declaration Of Robin Shields Under 37 C.F.R. .sctn. 1.68", dated Oct. 30, 1994, pp. 1-6.
U.S. Patent Application Serial No. 07/903,793, filed Jun. 24, 1992, title believed to be "A Circuit Design Having a Semiconductor Switch for Switching a Load", inventor believed to be Walter Kares, current status unknown, all pages.
Pease Robert A.
Shields Robin
DeBoer Todd
National Semiconductor Corporation
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