System for triac trigger control in combination with a sensing element
US5323062A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1991 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Dec 2, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/45
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A trigger control circuit of the kind wherein a load is supplied via a triac with current from an AC voltage supply source under the control of a triac control means in combination with a sensing element. In previous circuits the sensing element is energized by a current from a DC source which is derived by rectification and smoothing of the alternating current of an alternating voltage supply source. These circuits have limitations in integrated circuitry. The sensing element herein is energized by an alternating current to produce a sensed alternating current. The triac control means includes an integration element for producing a control signal which represents of the integral of the difference between a value corresponding to the magnitude of the sensed alternating current and a reference value. The triggering or otherwise of the triac is determined by a latch actuated in response to the magnitude of the control signal relative to one or more threshold levels. The trigger control circuit may be used in thermostats or other sensing devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.