Circuit and method of modifying characteristics of a utilization

Details Circuit and method of modifying characteristics of a utilization Circuit and method of modifying characteristics of a utilization

1995-07-03

1997-10-21

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219494, 437247, 437171, H05B 102

Patent

active

056792751

ABSTRACT:
A modification circuit (30) is thermally coupled to and electrically isolated from a circuit element (20) of a utilization circuit (10). During modification, current pulses are passed through an isolation circuit (40) to the modification circuit which heats the circuit element, e.g., a resistor, of the utilization circuit substantially above the normal operating temperature range of the element, thereby modifying the electrical characteristics of the resistor and therefore those of the utilization circuit to which it is connected. During normal operation of the utilization circuit the circuit element of the utilization circuit is electrically isolated from the modification circuit.

REFERENCES:
patent: 4606781 (1986-08-01), Vyne
patent: 4725791 (1988-02-01), Susak et al.
patent: 4810663 (1989-03-01), Raffel et al.
patent: 4962294 (1990-10-01), Beckham et al.
patent: 4991424 (1991-02-01), Lehto
patent: 5110758 (1992-05-01), Baskett
patent: 5466484 (1995-11-01), Spraggins et al.

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