Power supply controller for exercise equipment drive motor
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United States of America Patent
Stats
-
Jun 14, 2005
Grant Date -
Mar 11, 2004
app pub date -
Jan 27, 2003
filing date -
Jan 25, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A combined power supply and driver control module includes rectifier circuitry, switching circuitry, and driver circuitry for providing output power to a load. Rectified output from an input power source is used to produce a DC power. The switching circuitry receives the DC power and modulates the input current drawn from the power source. An intelligent control module includes control circuitry, such as a digital processor, for controlling the switching circuitry. Power factor is improved by modulating the input current to be closer in phase with the voltage of the power source. Also disclosed is a power factor correction circuit in which a digital processor reads waveform values from a lookup table and modulates the input current waveform based on the values. A zero crossing detector connected to the input power source may direct the digital processor when to commence reading values from the lookup table.
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