Power phase regulator circuit improvement, motor start switch, self-adjusting preheat and ignition trial improvement, and series-type voltage regulator improvement to hot surface ignition control for fuel oil burner
US5899684A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1997 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Jul 11, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2235/30
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fuel oil burner utilizing a hot surface ignition with an ignitor that is fully sintered and has essentially no porosity, a voltage phase regulator circuit for applying rectified half-wave AC line voltage, full-wave rectified AC, or either half-wave or full-wave rectified AC line voltage to the ignitor to supply power thereto, and AC line voltage to a blower motor, an AC-to-DC converter, a DC voltage preregulator, and a DC voltage regulator for providing twelve volts DC for operation of a control circuit that has a first time constant circuit for preheating the ignitor and maintaining the ignitor at consistent ignition temperature for a predetermined ignition trial time period and a second time constant circuit for driving second and third motor drive circuits. The third motor drive circuit energizes the start winding of the blower motor and the second motor drive circuit energizes the main winding of the blower motor thus starting the motor and providing fuel to the combustion chamber during a predetermined time concurrent with the ignition trial period. At that time, a third time constant circuit either maintains the fan blower motor in its energized state, if a flame of suffici…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.