Control system for cooking appliance employing convection and radiant cooking
US7109447B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 2004 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Nov 26, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/6485
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cooking appliance includes a heating system which is preferably capable of combining radiant, convection, microwave and conduction heating techniques to perform a cooking operation. The cooking appliance includes a convection fan and at least one heating device. A controller is provided to regulate a triac to create a variable fan speed and variable heater intensity through phase angle firing. Essentially, an AC waveform provided to the fan motor and/or the heater resistor travels through the triac which is turned on by the controller at predetermined points in the AC waveform, with the delay from a zero point waveform crossing functioning to reduce the amount of power sent to the heater resistor and fan motor. When the signal from the controller is removed, the triac advantageously turns off at the next zero crossing of the AC waveform such that an operationally and economically effective control system is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.