DC Chopper device

Details DC Chopper device DC Chopper device

1978-05-08

1980-06-10

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307242, 307254, 318341, H03K 1760, H03K 1756

Patent

active

042074789

ABSTRACT:
A DC chopper device comprising a DC power source, a plurality of power transistors connected in series with a controlled unit driven by the DC power source and connected in parallel with each other to make chopping operation, a chopper control unit controlling the chopping operation of the power transistors, and a base drive circuit connected between the chopper control unit and each of the power transistors. Each base drive circuit includes impedance means for discharging the charge stored in the base region of the associated power transistor when the power transistor is turned off from its conducting state, and current flow blocking means for blocking current flow through the impedance means in the conducting state of the power transistor. The impedance values of the impedance means in the base drive circuits are selected so that all the power transistors can be substantially simultaneously turned on.

REFERENCES:
patent: 3569742 (1971-03-01), Schroeder
patent: 3803471 (1974-04-01), Price et al.
patent: 4020364 (1977-04-01), Kaijk
patent: 4118641 (1978-10-01), Lannuzel

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