Multi-mode control circuit and indicator arrangement for an elec

Details Multi-mode control circuit and indicator arrangement for an elec Multi-mode control circuit and indicator arrangement for an elec

1988-12-06

1992-11-03

Paschall, Mark H.

Electric heating

Heating devices

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

219492, 219240, 219508, 219501, 340655, H05B 102

Patent

active

051608316

ABSTRACT:
A time-based electrical appliance multi-mode control circuit and indicator arrangement which is connected to a power supply and an on and off switch. Upon turning the switch on, power is simultaneously supplied to the electrical appliance load and to a dual timer circuit. A first timer in the circuit is immediately energized causing a first indicator to represent an on state to the user. After a predetermined length of time, the first timer causes one output to go low, turning off the on state indicator and respectively turning on a ready state indicator. A second timer is then activated for a second predetermined period. At the end of the second period, the ready state indicator is turned off and the standby state indicator is turned on. At the same time, a triac connected to the electrical appliance load is turned off causing the power to the load to be automatically switched off.

REFERENCES:
patent: 2292807 (1942-08-01), Waage
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patent: 4347428 (1982-08-01), Conrad et al.
patent: 4418268 (1983-11-01), Munshaw
patent: 4673798 (1987-06-01), Contri et al.
patent: 4745260 (1988-05-01), Albinger, Jr., et al.
PPC Industries 1990 Ltd.--Circuit Working Principle by W. M. Wong Nov. 14, 1988.
Mims, III, Engineer's Notebook II, a handbook of integrated circuit applications. Radio Shack Corp., Nov. 1988.

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