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Title: Burner ignition system

Abstract

An electronic ignition system for a gas burner is battery operated. The battery voltage is applied through a DC-DC chopper to a step-up transformer to charge a capacitor which provides the ignition spark. The step-up transformer has a significant leakage reactance in order to limit current flow from the battery during initial charging of the capacitor. A tank circuit at the input of the transformer returns magnetizing current resulting from the leakage reactance to the primary in succeeding cycles. An SCR in the output circuit is gated through a voltage divider which senses current flow through a flame. Once the flame is sensed, further sparks are precluded. The same flame sensor enables a thermopile driven main valve actuating circuit. A safety valve in series with the main gas valve responds to a control pressure thermostatically applied through a diaphragm. The valve closes after a predetermined delay determined by a time delay orifice if the pilot gas is not ignited.

Inventors:
 [1]
  1. Bedford, MA
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
865743
Patent Number(s):
4565519
Application Number:
06/459,787
Assignee:
Advanced Mechanical Technology, Inc. (Newton, MA)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F23 - COMBUSTION APPARATUS F23N - REGULATING OR CONTROLLING COMBUSTION
F - MECHANICAL ENGINEERING F23 - COMBUSTION APPARATUS F23Q - IGNITION
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
burner; ignition; electronic; gas; battery; operated; voltage; applied; dc-dc; chopper; step-up; transformer; charge; capacitor; provides; spark; significant; leakage; reactance; limit; current; flow; initial; charging; tank; circuit; input; returns; magnetizing; resulting; primary; succeeding; cycles; output; gated; divider; senses; flame; sensed; sparks; precluded; sensor; enables; thermopile; driven; main; valve; actuating; safety; series; responds; control; pressure; thermostatically; diaphragm; closes; predetermined; delay; determined; time; orifice; pilot; ignited; safety valve; main gas; battery operated; battery voltage; tank circuit; time delay; current flow; voltage divider; step-up transformer; output circuit; gas valve; gas burner; /431/361/

Citation Formats

Carignan, Forest J. Burner ignition system. United States: N. p., 1986. Web.
Carignan, Forest J. Burner ignition system. United States.
Carignan, Forest J. Tue . "Burner ignition system". United States. https://www.osti.gov/servlets/purl/865743.
@article{osti_865743,
title = {Burner ignition system},
author = {Carignan, Forest J},
abstractNote = {An electronic ignition system for a gas burner is battery operated. The battery voltage is applied through a DC-DC chopper to a step-up transformer to charge a capacitor which provides the ignition spark. The step-up transformer has a significant leakage reactance in order to limit current flow from the battery during initial charging of the capacitor. A tank circuit at the input of the transformer returns magnetizing current resulting from the leakage reactance to the primary in succeeding cycles. An SCR in the output circuit is gated through a voltage divider which senses current flow through a flame. Once the flame is sensed, further sparks are precluded. The same flame sensor enables a thermopile driven main valve actuating circuit. A safety valve in series with the main gas valve responds to a control pressure thermostatically applied through a diaphragm. The valve closes after a predetermined delay determined by a time delay orifice if the pilot gas is not ignited.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Patent:

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