Electronic gas valve power interruption switch
US5287048A · kind A · utility
7Cited by
4References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | May 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S236/03
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An electronic safety circuit for a portable gas heater includes a transformer and half wave rectifier connected in parallel with a fan motor for charging a capacitor, and a solid state switching circuit, which may be either a pair of cascaded transistors, an SCR, or a Darlington switch, for applying a reverse polarity voltage across the solenoid of a solenoid operated gas valve to immediately turn off the gas valve in the event of loss of power to the combustion fan motor. The electronic safety circuit may be conveniently mounted on a PC board and enclosed in the combustion fan motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.