Method and apparatus for quiet fan speed control

Details Method and apparatus for quiet fan speed control Method and apparatus for quiet fan speed control

2006-11-16

2009-02-10

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Series motors

Control by motor circuit impedance

C318S245000, C318S257000, C318S268000, C388S838000, C388S839000, C388S855000

Reexamination Certificate

active

07489094

ABSTRACT:
An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change the speed of the motor, a control circuit renders a first switch conductive, in response to a first detected AC voltage zero crossing, to charge a first capacitor to a predetermined voltage. The control circuit then renders a second switch conductive, in response to a subsequent second detected AC voltage zero crossing, to charge a second capacitor to the predetermined voltage. The control circuit then renders both switches simultaneously conductive at a predetermined time after a subsequent third detected AC voltage zero crossing. The capacitors will thereby be charged to the same voltage prior to being switched into series with the motor, thereby resulting in reduced acoustic noise when changing motor speeds.

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