Ignition circuit for gas burner - has triac for discharging capacitor through primary of ignition transformer after charging from rectifier bridge

摘要

The ignition circuit has a rectifier bridge (10) supplied with an ac voltage and charging a capacitor (GL) with a dc voltage via a charging resistor (RL). A control circuit, comprising a second resistor (RZ) and a diode (30), produces the turn-on signal for the triac (22) that connects the primary winding (18) of the ignition transformer (20) across the capacitor. Sparking electrodes (28) are connected to the secondary winding. The control circuit shunts the capacitor and the junction between its resistor and diode is connected to the gate of the triac. An interference-suppression capacitor (36) shunts the charging resistor and the rectifier's dc output.