Overload protection circuit

Details Overload protection circuit Overload protection circuit

1976-03-24

1978-05-30

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

330207P, 361 98, 361110, H02H 720

Patent

active

040926923

ABSTRACT:
This invention provides overload protection to power components such as power transistors. A pair of driver transistors is connected in push-pull configuration and is coupled through an auto transformer to a pair of power transistors also connected in push-pull configuration. An impedance-matching transformer couples the pair of power transistors to a load circuit, such as a speaker. A low turn winding is connected in series with the secondary winding of the impedance-matching transformer, and drives a high turn winding in a silicon controlled rectifier trigger circuit which is triggered "on" when an overload condition exists in the low turn winding. Upon conduction of the silicon controlled rectifier, a switching transistor is switched "on" and this, in turn, switches "off" a power disabling transistor which is connected directly to, and in power disabling relation to, the pair of driver transistors.

REFERENCES:
patent: 3177402 (1965-04-01), Muchnick et al.
patent: 3206695 (1965-09-01), Bennett, Jr.
patent: 3230440 (1966-01-01), Kleiner
patent: 3308391 (1967-03-01), McNamee
patent: 3345570 (1967-10-01), Matyckas
patent: 3512097 (1970-05-01), Tyler
patent: 3648111 (1972-03-01), Howe

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