Electricity: motive power systems – Three-or-more-positions motor controller systems – Return to 'off' – 'starting' or 'neutral' positions
Patent
1979-02-07
1981-08-11
Smith, Jr., David
Electricity: motive power systems
Three-or-more-positions motor controller systems
Return to 'off', 'starting' or 'neutral' positions
318139, H02P 300
Patent
active
042836689
ABSTRACT:
Disclosed herein is an alternate action solenoid drive circuit adapted for connection to a DC source having first and second power terminals and which can be incorporated in a DC motor control for a vehicle, also disclosed herein. The drive circuit comprises an actuator switch including go and stop terminals, and an actuator switch operable in response to movement of a foot pedal for alternately moving between a go position connecting the go terminal to the first power terminal and a stop or off position connecting the stop terminal to the first power terminal. The drive circuit includes a thyristor having an anode connected to the go terminal, and a cathode and a gate, a sequencing solenoid including a solenoid coil having one end connected to the cathode and an opposite end connected to the second power terminal, and a parallel RC network connected in series between the stop terminal and the thyristor gate for applying a trigger pulse to the gate when the actuator switch is moved to the off position. The drive circuit also includes a control circuit including a transistor having a collector connected to the anode, an emitter connected to the cathode, and a base connected to the solenoid coil for receiving transient current from the solenoid coil so as to render the transistor conductive for shunting the thyristor to prevent current flow through the thyristor in response to one of the trigger pulses applied to the gate alternate times the actuator is moved to the off position. The control circuit is also connected in circuit with the thyristor for allowing a holding current to flow through the thyristor in response to one of the trigger pulses applied to the gate the other alternate times the actuator switch is moved to the off position, and also for alowing the holding current to increase to an energizing current which flows through the thyristor and the solenoid coil to energize the solenoid alternate times the actuator switch moves to the go position.
REFERENCES:
patent: 3649896 (1972-03-01), Mason et al.
patent: 4125885 (1978-11-01), Lowther et al.
patent: 4131833 (1978-12-01), McAuliffe et al.
Outboard Marine Corporation
Smith Jr. David
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