Pulse-width modulated circuit for applying current to a load

Details Pulse-width modulated circuit for applying current to a load Pulse-width modulated circuit for applying current to a load

1994-08-02

1996-05-21

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

318811, H02M 324, H02P 528

Patent

active

055196012

ABSTRACT:
A pulse-width modulated (PWM) circuit alternately applies voltage from a power supply across a load, and alternately establishes one or more non-powered, closed paths for freewheeling current. The circuit includes pairs of switches connected to the load and also connected to the power supply. PWM signals derived from a command signal drive the switches in such a manner as to create the freewheeling current paths in a desired pattern and sequence. The circuit effectively reduces ripple current in the load while also substantially reducing the amount of current flowing through the power supply filter capacitor. Thus, the size and rating of the power supply can be reduced. One can use the invention to drive a load in a multiple-phase environment, and also in the context of a three-phase trapezoidal drive.

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Publication "DC and Brushless Motors and Control Systems", by Motion Control Seminars, pp. 7-7 thru 7-11, Feb. '84.
Brochure: "Compumotor and Digiplan . . . Product Technologies", by Parker Hannifin Corporation, May '92, p. A26.

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