# US 5,347,104 A · Heater control circuit

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- Number: US 5,347,104 A
- Document ID: US5347104A
- Status: Granted
- Kind: A
- Application number: 07/887,421
- Filed: 1992-05-21
- Granted: 1994-09-13
- Earliest claimed: 1989-12-12
- Assignees: Rinnai Corporation
- Inventors: Makoto Morishima; Yoshihiro Kanaya
- Web page: https://patentgrep.com/patent/US5347104A

## CPC

- H02H 9/04: responsive to excess voltage (lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T)
- F24C 7/087: {of electric circuits regulating heat}
- H05B 3/0071: {for domestic applications}
- H05B 3/0076: {for cooking, e.g. in ovens (lamps specially adapted for non-metallic cooking plates H05B3/742, H05B3/744)}
- H05B 3/008: {for heating of inner spaces}
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)
- F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A heater control circuit is provided to control the heating condition of a cooking oven by means of a triac. In the heater control circuit, an electrical heater is incorporated. The heater further has a switch which is electrically connected in series with the heater so as to actuate and deactuate the heater in combination with on-off operation of the switch. A control relay is electrically connected in series with the triac and the heater to be actuated and deactuated in association with on-off operation of the switch so as to break an electrically conductive path through the triac.

## Claims

### Claim 1

A heater control circuit comprising:
an electrical heater provided to cook articles to be cooked, and electrically connected across respective first and second terminals of a house wiring connector for connection to a power source;
a triac having first and second anodes and electrically connected in series between the first connector terminal and the heater to control the heater;
manually operable switch means electrically coupled to the heater so as to actuate and deactuate the heater in response to respective on and off operation of the switch means, said switch means being electrically connected in series between the first connector terminal and the first triac anode; and
control means electrically coupled to the heater and the triac for controlling the heater and comprising a pair of normally open relay contacts, closeable only upon on operation of said switch means and electrically connected in series with the heater so as to actuate and deactuate the heater, said relay contacts being also electrically connected in series between the second connector terminal and the second triac anode and opened in response to the off operation of the switch means,
whereby the off operation of the switch means will open a first electrically conductive path through the switch means from the first connector terminal to the first anode of the triac and will also cause the control means to open a second electrically conductive path from the second connector terminal through the heater and the relay contacts to the second anode of the triac.

### Claim 2 (depends on 1)

A heater control circuit according to claim 1, wherein the heater is an infrared halogen heater.