Method and apparatus for controlling an electromechanical load b

Details Method and apparatus for controlling an electromechanical load b Method and apparatus for controlling an electromechanical load b

1993-03-09

1995-08-15

Dougherty, Thomas M.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

H02M 3335

Patent

active

054425352

ABSTRACT:
A method and apparatus for reducing the acoustic noise of an electromechanical load. Switching frequencies are chosen so that the switching ripple is submerged in the natural noise of the load. This device includes a converter which, through use of one or more pulse switches, controls the load, a chopper circuit and a control unit, a random number generator being linked to the chopper.

REFERENCES:
patent: 4638417 (1987-01-01), Martin, Jr. et al.

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