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Fault-tolerant multi-point flame sense circuit

  • US 6,794,771 B2
  • Filed: 06/20/2002
  • Issued: 09/21/2004
  • Est. Priority Date: 06/20/2002
  • Status: Expired due to Term
First Claim
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1. A fault-tolerant multi-point flame sense circuit, comprising:

  • an electronically controllable switch having a control input, an RC network having a first node coupled to the control input of the switch and a second node coupled to ground; and

    a plurality of flame sense electrode channels, each flame sense electrode channel having a separate capacitive coupling to a line voltage input and a separate resistive coupling to the first node of the RC network.

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