Method of and system for controlling the operation of a heater
US4420113A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1982 |
| Grant date | Dec 13, 1983 |
| Priority date | — |
| Expiry date | May 28, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2227/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A space heater, designed to maintain the temperature of a room between a lower limit T.sub.m and an upper limit T.sub.M, is controlled by a system including a sawtooth-wave generator working by way of a clipping stage into a differential amplifier also receiving a monitoring signal representing the difference between an output voltage of a temperature sensor and a reference voltage. The differential amplifier emits a train of command pulses of temperature-dependent duration which temporarily reduce the mean power of the heater to a fraction of its maximum value, as by periodically interrupting its fuel supply when that heater comprises a gas burner. The heater is cut off for an extended period when the upper range limit T.sub.M is exceeded and is then restarted when the temperature falls beneath the lower limit T.sub.m. In the case of a gas burner of the catalytic type, the cut-in is accompanied by a supply of additional gas to the burner for a limited time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.