DC Motor control with alternate action solenoid drive circuit

An alternate action solenoid drive circuit adapted for connection to a DC source having first and second power terminals, said circuit comprising actuator switch means including go and stop terminals, and an actuator switch connected to the first power terminal and selectively operable for alternately moving between a go position connecting said go terminal to the first power terminal, and an off position connecting said stop terminal to the first power terminal, first semiconductor switching means having a first terminal connected to said go terminal, and having a second terminal and a third terminal, a solenoid including a solenoid coil connected in series relation with said first semiconductor switching means between the first and second power terminals, first circuit means connected to and between said stop terminal and said third terminal for applying a trigger pulse to said third terminal when said actuator switch is moved to said off position, and second circuit means connected in circuit with said first semiconductor switching means and said solenoid coil for preventing current flow through said first semiconductor switching means in response to one of said trigger pulses alternate times said actuator is moved to said off position, and for allowing a holding current to flow through said first semiconductor switching means in response to one of said trigger pulses applied to said third terminal the other alternate times said actuator switch is moved to said off position, said second circuit means also for allowing the holding current to increase to an energizing current which flows through said first semiconductor switching means and said solenoid coil to energize said solenoid alternate times said actuator switch moves to said go position.

An alternate action solenoid drive circuit adapted for connection to a DC source having first and second power terminals, said circuit comprising actuator switch means including go and stop terminals, and an actuator switch connected to the first power terminal and selectively operable for alternately moving between a go position connecting said go terminal to the first power terminal and an off position connecting said stop terminal to the first power terminal, a thyristor including an anode connected to said go terminal, and a cathode and a gate, a solenoid including a solenoid coil having one end connected to said cathode and an opposite end connected to the second power terminal, a parallel RC network connected in series between said stop terminal and said thyristor gate for applying a trigger pulse to said gate when said actuator switch is moved to said off position, and circuit means including a transistor having a collector connected to said anode and an emitter connected to said cathode, and also having a base connected to said solenoid coil for receiving transient current from said solenoid coil so as to render said transistor conductive for shunting said thyristor anode and cathode to prevent current flow through said thyristor in response to one of said trigger pulses applied to said gate alternate times said actuator is moved to said off position, said circuit means also connected in circuit with said thyristor for allowing a holding current to flow through said thyristor in response to one of said trigger pulses applied to said gate the other alternate times said actuator switch is moved to said off position, said circuit means also for allowing said holding current to increase to an energizing current which flows through said thyristor and said solenoid coil to energize said solenoid alternate times said actuator switch moves to said go position.

A direct current motor control for a direct current motor, said motor control comprising a bank of series connected batteries, and switch means for electrically disconnecting and connecting said bank to the motor so that successive energizations of the motor are alternately from opposite ends of said battery bank, said switch means including alternate action solenoid drive circuit means adapted for connection to a DC source having first and second power terminals, said solenoid drive circuit means including actuator switch means including go and stop terminals, and an actuator switch connected to the first power terminal and selectively operable for alternately moving between a go position connecting said go terminal to the first power terminal, and an off position connecting said stop terminal to the first power terminal, first semiconductor switching means having a first terminal connected to said go terminal, and having a second terminal and a third terminal, a solenoid including a solenoid coil connected in series relation with said first semiconductor switching means between the first and second power terminals, first circuit means connected to and between said stop terminal and said third terminal for applying a trigger pulse to said third terminal when said actuator switch is moved to said off position, and second circuit means connected in circuit with said first semiconductor switching means and said solenoid coil for preventing current flow through said first semiconductor switching means in response to one of said trigger pulses alternate times said actuator is moved to said off position, and for allowing a holding current to flow through said first semiconductor switching means in response to one of said trigger pulses applied to said third terminal the other alternate times said actuator switch is moved to said off position, said second circuit means also for allowing said holding current to increase to an energizing current which flows through said first semiconductor switching means and said solenoid coil to energize said solenoid alternate times said actuator switch moves to said go position.

A direct current motor control for a direct current motor, said motor control comprising a bank of series connected batteries, and switch means for electrically disconnecting and connecting said bank to said motor so that successive energizations of said motor are alternately from opposite ends of said battery bank, said switch means including alternate action solenoid drive circuit means adapted for connection to a DC source having first and second power terminals, said solenoid drive circuit means including actuator switch means including go and stop terminals, and an actuator switch connected to the first power terminal and selectively operable for alternately moving between a go position connecting said go terminal to the first power terminal and an off position connecting said stop terminal to the first power terminal, a thyristor including an anode connected to said go terminal, and a cathode and a gate, a double-pole single-throw solenoid including a solenoid coil having one end connected to said cathode and an opposite end connected to the second power terminal, a parallel RC network connected in series between said stop terminal and said thyristor gate for applying a trigger pulse to said gate when said actuator switch is moved to said off position, and circuit means including a transistor having a collector connected to one of said anode and cathode, and an emitter connected to the other of said anode and cathode, and also having a base connected to said solenoid coil to respond to transient current flow in said solenoid coil so as to render said transistor conductive for shunting said thyristor anode and cathode to prevent current flow through said thyristor in response to one of said trigger pulses applied to said gate alternate times said actuator is moved to said off position, said circuit means also connected in circuit with said thyristor for allowing a holding current to flow through said thyristor in response to one of said trigger pulses applied to said gate the other alternate times said actuator switch is moved to said off position, said circuit means also for allowing said holding current to increase to an energizing current which flows through said thyristor and said solenoid coil to energize said solenoid coil alternate times said actuator switch moves to said go position.

A vehicle comprising a direct current motor control including a direct current motor, a bank of series connected batteries, and switch means for electrically disconnecting and connecting said bank to the motor so that successive energizations of the motor are alternately from opposite ends of said battery bank, said switch means including alternate action solenoid drive circuit means adapted for connection to a DC source having first and second power terminals, said solenoid drive circuit means including actuator switch means including go and stop terminals, and an actuator switch connected to the first power terminal and selectively operable for alternately moving between a go position connecting said go terminal to the first power terminal, and an off position connecting said stop terminal to the first power terminal, first semiconductor switching means having a first terminal connected to said go terminal, and having a second terminal and a third terminal, a solenoid including a solenoid coil connected in series relation with said first semiconductor switching means between the first and second power terminals, first circuit means connected to and between said stop terminal and said third terminal for applying a trigger pulse to said third terminal when said actuator switch is moved to said off position, and second circuit means connected in circuit with said first semiconductor switching means and said solenoid coil for preventing current flow through said first semiconductor switching means in response to one of said trigger pulses alternate times said actuator is moved to said off position, and for allowing a holding current to flow though said first semiconductor switching means in response to one of said trigger pulses applied to said third terminal the other alternate times said actuator switch is moved to said off position, said second circuit means also for allowing said holding current to increase to an energizing current which flows through said first semiconductor switching means and said solenoid coil to energize said solenoid alternate times said actuator switch moves to said go position.

An alternate action solenoid drive circuit adapted for connection to a DC source having first and second power terminals, said circuit comprising actuator switch means including go and stop terminals, and an actuator switch connected to the first power terminal and selectively operable for alternately moving between a go position connecting said go terminal to the first power terminal, and an off position connecting said stop terminal to the first power terminal, first semiconductor switching means having a first terminal connected to said go terminal, and having a second terminal and a third terminal, a solenoid including a solenoid coil connected in series relation with said first semiconductor switching means between the first and second power terminals, first circuit means connected to and between said stop terminal and said third terminal for applying a trigger pulse to said third terminal when said actuator switch is moved to said off position, and second circuit means connected in circuit with said first semiconductor switching means and comprising second semiconductor switching means connected to said solenoid coil for responding to transient current flow in said solenoid coil so as to be rendered operative to prevent current flow through said first semiconductor switching means in response to one of said trigger pulses alternate times said actuator is moved to said off position.

An alternate action solenoid drive circuit adapted for connection to a DC source having first and second power terminals, said circuit comprising actuator switch means including go and stop terminals, and an actuator switch connected to the first power terminal and selectively operable for alternately moving between a go position connecting said go terminal to the first power terminal, and an off position connecting said stop terminal to the first power terminal, a thyristor having an anode connected to said go terminal, and a cathode and a gate, a solenoid including a solenoid coil connected in series relation with said thyristor between the first and second power terminals, first circuit means connected to and between said stop terminal and said gate for applying a trigger pulse to said gate when said actuator switch is moved to said off position, and second circuit means connected in circuit with said thyristor and said solenoid coil for preventing current flow through said thyristor in response to one of said trigger pulses alternate times said actuator is moved to said off position, and for allowing a holding current to flow through said thyristor in response to one of said trigger pulses applied to said gate the other alternate times said actuator switch is moved to said off position, said second circuit means also for allowing said holding current to increase to an energizing current which flows through said thyristor and said solenoid coil to energize said solenoid alternate times said actuator switch moves to said go position.