Overvoltage protection for an integrated circuit

Details Overvoltage protection for an integrated circuit Overvoltage protection for an integrated circuit

H - Electricity

02

H

323/7

H02H 9/04 (2006.01)

Patent

CA 1053330

OVERVOLTAGE PROTECTION FOR AN INTEGRATED CIRCUIT ABSTRACT OF THE DISCLOSURE A pass transistor is coupled serially with an integrated circuit across a DC energy source. The DC source includes a battery coupled in parallel with a charging transformer output and a diode, the negative side being connected to ground. A resistor is coupled across the pass transistor collector and base to assure conduction by the pass transistor when the DC source is operative. A string of zener diodes is connected between the pass transistor base and ground to provide voltage limiting by clamping the transistor base during an overvoltage condition arising, for example, when the battery has a defective cell or an open connection to the remainder of the circuit. Such an arrangement allows reliable operation with monolithic transistors having about 27 volts collector to emitter breakdown voltage rating.

242340

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