Multi-stage electric heater apparatus and method of control

Details Multi-stage electric heater apparatus and method of control Multi-stage electric heater apparatus and method of control

1974-10-23

1976-01-13

Envall, Jr., R. N.

Electric heating

Heating devices

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

219483, H05B 102

Patent

active

039327299

ABSTRACT:
An electric heater control circuit is shown which utilizes a 10-step controller for obtaining eighteen steps of heating control. Electrical and magnetic control circuitry operates this 10-step controller effectively through two cycles, one at a low level power output mode and a second at a high level power output mode, to thereby substantially increase the effective number of steps of heat control. In addition, means are provided for instantaneously energizing or de-energizing a plurality of small electric heaters upon shifting modes to compensate for the de-energization or energization respectively of a large heater to thereby avoid momentary periods of excess heat or cold while the controller is shifting modes.

REFERENCES:
patent: 2848588 (1958-08-01), Hackman
patent: 3052788 (1962-09-01), Peters
patent: 3161758 (1964-12-01), Biermann et al.
patent: 3579264 (1971-05-01), Mork et al.

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