Transistor switching apparatus for use in the control of a D.C.

Details Transistor switching apparatus for use in the control of a D.C. Transistor switching apparatus for use in the control of a D.C.

1978-11-09

1980-08-19

Shoop, William M.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

318332, 318345B, 318722, H02M 700

Patent

active

042187303

ABSTRACT:
A power switching apparatus for use in the control of a D.C. load such as a D.C. motor comprises a power transistor with its emitter-collector path connected in series with the D.C. motor and a battery. A base current of the power transistor is supplied from the battery through a controllable impedance element. A control unit is provided to vary the impedance of the controllable impedance element in response to the current flowing through the emitter-collector path in such a manner that the base current changes as substantially the inverse-function of a characteristic curve indicating a D.C. amplification factor versus collector current of the power switch transistor.

REFERENCES:
patent: 3484652 (1969-12-01), Thiele
patent: 3543140 (1970-11-01), Krausser
patent: 4032833 (1977-06-01), Ibamoto et al.
patent: 4095127 (1978-06-01), Nerem
patent: 4109167 (1978-08-01), Kaui et al.

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