Back to results
US 5,470,223 AGranted
Microprocessor controlled fuel and ignition control for a fuel burning device
AssigneeDESA International, Inc.
InventorHugh W. McCoy
Life of this patent
Estimating the term…
Abstract
A primary control unit and ignitor using a microprocessor for fuel and ignition control and intelligent flame monitoring of a fuel burning device such as kerosene fired heaters. The control unit will function with a voltage supply ranging from 30 to 264 volts, 50 or 60 hertz. It has intermittent ignition resulting in reduced electromagnetic interference and longer spark plug life. The ignitor circuit is isolated from the DC power supply to prevent any common mode electromagnetic interference.
Claims16
A microprocessor fuel and ignition control unit for a fuel burning device comprising:
- an AC voltage source providing a positive one-half cycle and a negative one-half cycle;
- a DC power supply coupled to said microprocessor and to said AC voltage source for operating only on the positive one-half cycle of the AC voltage to produce a regulated DC voltage for said control unit;
- and
- an ignitor circuit coupled to said microprocessor and said AC voltage source for using only the negative one-half cycle of said AC voltage to cause an ignition of said fuel so as to prevent any common mode electromagnetic interference generated by the ignitor from interfering with said DC power supply.
1 more element
Dependencies are inferred from the claim text.