Electric-powered vehicle with time-delay switch circuitry, especially for electrical vehicles

Claim 1

A vehicle comprising driven wheels, a direct-current source, an electric motor connected to said source and operating said wheels, a plurality of sequentially operable current-control devices for said motor energizable to establish respective states of operation of said motor, and a time-delay switching circuit interposed between said direct-current source and said motor, said circuit including a plurality of stages for the sequential control of said current-control devices each stage comprising: a thyristor having its main electrodes connected in circuit with a respective one of said current-control devices across said source; an R-C network having a series-connected resistor and capacitor connectable to said source for charging of said capacitor through said resistor from said source, each R-C network except that of the first stage being connected between the output side of the thyristor of its stage and the output side of the thyristor of the next stage; a voltage-divider network connected to said source, each voltage-divider network except for that of the first stage being connected between the output side of the thyristor of its stage and the output side of the thyristor of the next stage; and a unijunction transistor having its emitter connected to said RC network between the resistor and capacitor thereof, a first base connected to said voltage-divider network for establishing the threshold voltage of said unijunction transistor, and a second base connected to the gate of said thyristor said networks of said first stage each having one terminal connected to the output side of the thyristor of the respective stage and another terminal connected to the input side of the latter thyristor, said voltage-divider networks each consisting of two resistors between which the said first base of the respective unijunction transistor is connected.