Ignition boost and rectification flame detection circuit

摘要: A gas furnace control circuit combines an igniter and a rectification flame detection circuit. Pulsating current is applied respectively to inducer valve relay coils actuate the furnace. rectifier supplies flyback pulses from coil capacitor arrangement accumulate voltage. An ignition transformer has its secondary connected probe for generating arc. hysteresis switch coupled between primary of discharges through whenever stored voltage reaches predetermined threshold. Another coil. transistor signal impedance with drain or power electrode define output terminal. resistor network first one end other gate transistor. second source electrodes The also resistor, so that said in state if present, not present burner.