Voltage independent PWM base frequency generating method
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United States of America Patent
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-
Sep 9, 2003
Grant Date -
Feb 28, 2002
app pub date -
Aug 10, 2001
filing date -
Aug 10, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A DC brushless motor operation speed control method is disclosed. First, a linearly voltage dependent current source is used to charge a capacitor and the terminal voltage of the capacitor is coupled to a linearly voltage dependent base frequency level detector. When the output voltage of the capacitor reaches the base frequency reference voltage, the signal output from the base frequency level detector will make the capacitor discharge, outputting a series of base frequency triangular waves. Under different supply voltages, all the generated base frequency triangular waves have the same cycle time. The base frequency triangular waves are transmitted to a speed control comparator. Through pulse width modulation, the speed control reference voltage adjusts the output pulse width of the comparator and thereby controls the speed of the motor.
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