DC on line AC brushless motor
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United States of America Patent
Stats
-
Feb 25, 1997
Grant Date -
N/A
app pub date -
Nov 22, 1994
filing date -
Nov 22, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A phase regulated power supply is provided for converting alternating current (AC) to direct current (DC) for powering a DC brushless motor, such as a fan. The power supply includes a full wave bridge rectifier and a driver circuit, which may be an IC chip, controlled by standard commutation circuitry. An output capacitor is connected electrically downstream to the switch for supplying a reduced DC ripple voltage to the motor load. The power supply preferably includes a line filter for removing input power surges. The speed of the motor may be varied by changing the values of bias resistors used with the driver circuit.
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