Electrical power control apparatus

Details Electrical power control apparatus Electrical power control apparatus

1985-02-28

1987-06-23

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

318341, H02P 706

Patent

active

046755888

ABSTRACT:
An electrical power control apparatus in which power to a load is shared between a plurality of power semiconductors, only one of which is shown. Each power semiconductor forms part of a separate servo loop comprising, in its simplest form, a current sensor whose output signal modulates the output pulse width of a signal generator. The output from the signal generator is used to control the conduction times of the power semiconductor via drive circuit. Although it is possible, indeed desirable, to synchronise operation of the signal generators of the different servo loops, the loops are completely independent of one another, and the instantaneous pulse width of the drive pulses in any one servo loop is controlled only by the characteristics of that loop.

REFERENCES:
patent: 4174534 (1979-11-01), Kotearewsky
patent: 4278930 (1981-07-01), Rogers
Motorola Linear Integrated Circuits, MC 3420; MC 3520; Switchmode Regulator Control Circuit, 1979.

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