Constant-frequency active filter controlled by a peak current control mode
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United States of America Patent
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May 14, 2002
Grant Date -
N/A
app pub date -
Jan 5, 2001
filing date -
Jan 5, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A constant-frequency active filter controlled by a peak current control mode, the constant-frequency active filter composes of a voltage step-up unit and a power factor corrector, wherein the power factor corrector is composed of a voltage control loop and a current control loop. The voltage step-up unit adjusts a waveform of an input current to a sine waveform. The voltage control loop has a microprocessor that provides a current command having the same phase with an input voltage to a PWM controller of the current control loop. The current control loop provides a sensing current induced from the input current to the PWM controller. The PWM controller receives the sensing current and the current command to control the input voltage and the input current to become the same phase so as to obtain a high power factor.
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