Regulator circuit for control of heat output of a heating element
US4629852A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1984 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Feb 13, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1913
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A regulator circuit for controlling the heat output of a heating element adapted to be switched on and off by a semiconductor switch energized by a zero crossing switch having cycle group control, whereby a sensor signal derived from the sensed temperature is supplied to the zero crossing switch. In order to avoid an overriding of the control or operating temperature in the heating phase and to improve the accuracy of the temperature control, a secondary control voltage is derived from the sensor voltage according to the rate of rise and drop of the sensor voltage which in the heat phase the switch-off of the heating element is reset to lower temperatures depending on the secondary control voltage and in the cooling phase the switch-on of the heating element is reset to higher temperatures depending on the secondary control voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.