Claims
- 1. A spark generation and flame detection arrangement, including; spark generator means including a transformer secondary output winding having an output voltage which is high enough to produce an ignition spark across a spark gap and adapted to ignite a fuel; flame detector means including a transformer secondary winding impressing a flame detection voltage across said spark gap with said spark generator transformer secondary winding in series circuit with said detector transformer secondary winding; said flame detection voltage providing a current in said flame detection means when flame is present across said spark gap; and voltage clipping means connected across said spark gap and said spark generator transformer secondary winding; said voltage clipping means having a clipping voltage that is low compared to said spark generator output voltage, and that is high compared to said flame detection voltage; said voltage clipping means acting to conduct said spark generator means output voltage to prevent said spark generator output voltage from adversely affecting said flame detection means.
- 2. A spark generation and flame detection arrangement as described in claim 1 wherein said voltage clipping means is a bidirectional voltage breakdown device.
- 3. A spark generation and flame detection arrangement as described in claim 2 wherein said voltage breakdown device is a gas tube, and said flame detection means includes flame rectification responsive circuit means.
- 4. A spark generation and flame detection arrangement as described in claim 3 wherein said spark generating means includes silicon controlled rectifier relaxation oscillator means to generate said output voltage that is adapted to ignite said fuel.
Parent Case Info
This is a continuation of application Ser. No. 856,695, filed Dec. 2, 1977 and now abandoned.
US Referenced Citations (13)
Continuations (1)
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Number |
Date |
Country |
Parent |
856695 |
Dec 1977 |
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