Pulse frequency modulation control for a heater
US4604517A · kind A · utility
16Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 1985 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | May 20, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1913
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A microcomputer is programmed to respond to the zero crossings of an AC power source to trigger a uniform pulse pattern of an integral number of AC cycles as the AC excitation to a heater element to maintain the temperature of the heater element essentially constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.