Chopper with adaptive energy commutation

Details Chopper with adaptive energy commutation Chopper with adaptive energy commutation

1978-12-28

1981-08-18

Smith, Jr., David

Electricity: motive power systems

Constant motor current, load and/or torque control

318345G, 318434, H02P 516

Patent

active

042849381

ABSTRACT:
Apparatus for controlling the voltage on a commutating capacitor in a thyristor time ratio control power circuit whereby the energy stored in the capacitor may be continuously adjusted to a magnitude required for commutation so that the size of the commutating circuit can be significantly reduced. An inductive circuit is provided in a charging current path for the capacitor so that the capacitor can be charged above available source voltage by capacitive/inductive action. A controllable switch connected in parallel with the inductive circuit provides a short-circuit path for terminating charging of the capacitor. A logic circuit monitors capacitor voltage, source voltage and load current and closes the controllable switch when the capacitor voltage reaches a magnitude established by the logic circuit as sufficient to commutate the measured magnitude of load current.

REFERENCES:
patent: 3365640 (1968-01-01), Gurwicz
patent: 3535559 (1970-10-01), Adams
patent: 3562611 (1971-02-01), Gurwicz
patent: 3629615 (1971-12-01), Gurwicz
patent: 3657625 (1972-04-01), Miller et al.
patent: 3659119 (1972-04-01), Kasama et al.
patent: 3993942 (1976-11-01), Schmidt et al.
patent: 4011777 (1977-04-01), Bailey
patent: 4032825 (1977-06-01), Klimo
patent: 4074175 (1978-02-01), Born et al.

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