Heat variation detecting circuit for the microwave oven
US4766279A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1986 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Dec 24, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/645
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A heat variation detecting circuit, for use with a heat sensor in a microwave oven, comprises a heat sensor, temperature memorizing registers and control comparators. The temperature sensed by the heat sensor is converted via an A/D converter into a digital signal and is memorized in a present temperature register. A buffer register and a prior temperature register will then compare via at a comparator the present and prior temperatures to give a Reset or Enable signal at the comparator in accordance with coincidence or noncoincidence of the temperatures between the present and the prior temperatures in order to control a temperature error counter. The output of the temperature error counter together with the output of the presetting register controls a comparing unit for producing a signal for control of the Magnetron.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.