Temperature compensated overload trip level solid state relay

Details Temperature compensated overload trip level solid state relay Temperature compensated overload trip level solid state relay

1990-04-30

1991-04-09

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 56, 361103, 323907, H02H 504

Patent

active

050069497

ABSTRACT:
In solid state relay circuit including a metal oxide field effect transistor connected for switching current to a load circuit, a latch circuit including first and second transistors connected to monitor a voltage caused by current in the load circuit and to shunt current away from the field effect transistor in response to current overload in the load circuit, the first and second transistors having temperature characteristics such that they turn on in response to different voltages at different temperatures, the improvement including a second means for turning on the latch to shunt current away from the field effect transistor in response to the voltage caused by current in the load circuit, the second apparatus including temperature compensating apparatus for matching the temperature characteristics of the first and second transistors of the latch circuit whereby the latch turns on at the same voltage in the load circuit over the typical operating range of the device.

REFERENCES:
patent: 4581540 (1986-04-01), Guajardo
patent: 4593338 (1986-06-01), Takeda et al.
patent: 4669026 (1987-05-01), Widlar
patent: 4730228 (1988-03-01), Einzingek et al.

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