Preheat timer for use in oven

Details Preheat timer for use in oven Preheat timer for use in oven

1987-02-03

1988-05-03

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Switch actuation

307140, H01H 334

Patent

active

047422467

ABSTRACT:
A preheating timer for use in an oven unit ensuring uniform finish of cooked (or baked) food independent of high and low initial temperatures in the oven chamber, by applying a simplified electric circuit wherein it automatically determines the preheating time in response to the initial temperature in the oven chamber comprising; a capacitor simulating a temperature characteristics; the first resistor for charging the capacitor from the DC voltage circuit through a reverse-current inhibit diode; a voltage detection circuit composed of zener diode(s) and a transistor for detecting a voltage in the capacitor terminal; and the second resistor for discharging capacitor from the output terminal of the reverse-current inhibit diode.

REFERENCES:
patent: 3646560 (1972-02-01), Barlow, Jr.
patent: 4110632 (1978-08-01), Wyland
patent: 4370125 (1983-01-01), Donnelly et al.
patent: 4389599 (1983-06-01), Jabor
patent: 4523103 (1985-06-01), Zirkl
patent: 4538074 (1985-08-01), Fraden

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