| 主权项 |
1. A gas powered appliance comprising an ignition control system, a gas burner, a valve for controlling a flow of fuel to the gas burner, and an electrical resistance igniter for igniting fuel at the gas burner, wherein the ignition control system comprises:
a user actuable control interface having an off state and an on state, the control interface coupled to the valve and operative to control the valve and provide a control signal indicative of the state of the control interface; a controller including:
a timer circuit responsive to the control signal from the control interface; anda boost circuit coupled to the timer circuit, wherein the timer circuit is configured to activate the boost circuit for a predetermined period of time; a first direct current power supply selectively coupled by the boost circuit to the electrical resistance igniter, where power from the first direct current power supply is provided to the electrical resistance igniter through the boost circuit when the boost circuit is activated; and a second direct current power supply coupled to the electrical resistance igniter and the control interface, the second direct current power supply being configured to provide power to the electrical resistance igniter after expiration of the predetermined period of time to maintain the electrical resistance igniter at a predetermined temperature above an ignition temperature of the fuel, wherein a voltage from the first direct current power supply is greater than a voltage from the second direct current power supply, wherein the control interface comprises a gas control knob, a first position of the gas control knob activating the first direct current power supply to energize the boost circuit and a second position of the gas control knob modulating the flow of fuel to the gas burner with the second direct current power supply in an activated state. |
