| 摘要 |
<p>BURNER CONTROL WITH INTERRUPTED IGNITION The interrupted ignition system is used in a burner control circuit having a primary side which has as its primary function the application of a line voltage to the burner motor and the fuel igniter and a secondary side, which is responsive to a thermostat, and includes a light sensitive element for detecting a flame at the burner plus a current responsive element which in combination with a circuit breaking switch in the primary functions as a circuit breaker for disconnecting the igniter and motor from the line voltage under certain conditions. The igniter is controlled by a triac switch in the primary which in turn is responsive to an optical coupler connected to the secondary of the burner control circuit. When the thermostat contacts are closed, thereby indicating a call for heat, the optical coupler will cause the triac to switch on, resulting in current flow through the igniter. With the detection of a flame by the flame cell, the optical coupler will be shut off, resulting in the switching off of the triac and the discontinuation of current through the igniter, thus permitting a reduction in the overall electrical power consumption of the system. In the event the flame should be lost, the optical coupler will again switch on the igniter until either a flame is detected or the circuit breaker times out and the primary side is disconnected from the line voltage.</p> |
