Burner ignition system
- Bedford, MA
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Assignee:
- Advanced Mechanical Technology, Inc. (Newton, MA)
- Patent Number(s):
- US 4565519
- Application Number:
- 06/459,787
- OSTI ID:
- 865743
- Country of Publication:
- United States
- Language:
- English
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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
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