초록 ▼

An arrangement for driving a pair of actuator solenoids or coils of a gas valve having two or more solenoids employs a microprocessor or similar controller and an driver circuit. An output terminal of the microprocessor provides a steady low for OFF and a pulsating output signal for ON. A transistor

An arrangement for driving a pair of actuator solenoids or coils of a gas valve having two or more solenoids employs a microprocessor or similar controller and an driver circuit. An output terminal of the microprocessor provides a steady low for OFF and a pulsating output signal for ON. A transistor switching device is gated by the microprocessor, drives the first solenoid as its collector load. A rectifying diode connects the first solenoid to an accumulator capacitor, which ramps up from flyback pulses that pass through the rectifier. A negative resistance discharge device conducts when the accumulated voltage exceeds a threshold to energize the second solenoid. In a favorable embodiment the impedance of the second solenoid is higher than the first solenoid. In a second embodiment, the actuator circuit for the second solenoid can be a voltage doubling flyback driven relaxation oscillator.

대표청구항 ▼

[ I claim:] [1.]1. Actuator circuit for electrically actuating a dual-solenoid gas valve on a gas line, in which a first gas-valve solenoid and a second gas-valve solenoid are both energized to open the gas valve to supply a burner; comprising:a controller circuit for selectively providing output pu

[ I claim:] [1.]1. Actuator circuit for electrically actuating a dual-solenoid gas valve on a gas line, in which a first gas-valve solenoid and a second gas-valve solenoid are both energized to open the gas valve to supply a burner; comprising:a controller circuit for selectively providing output pulses at an output terminal having a first state at which pulses are present and a second state in which pulses are absent;a switch device having a control electrode coupled to the output terminal of said controller circuit and an output electrode connected to said first gas-valve solenoid to supply drive pulses thereto to open a first valve element on said gas line; anda flyback-driven relaxation oscillator circuit having an input coupled to a junction of said first gas-valve solenoid and the output electrode of said switch device to receive flyback voltage from said first gas-valve solenoid, and an output connected to said second gas-valve solenoid to provide drive pulses thereto to open a second valve element in tandem with said first valve element on said gas line.