Control of the output power of a DC-DC converter upon varying the switching frequency
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United States of America Patent
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Jan 4, 2000
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N/A
app pub date -
Apr 6, 1998
filing date -
Apr 9, 1997
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Abstract
The power output of a static DC--DC converter employing a current mode PWM controller is controlled upon the varying of the switching frequency, by detecting the sawtooth signal produced by the local oscillator generating a DC signal with an amplitude inversely proportional to the frequency. The power output is controlled by alternatively clamping the output voltage of the error amplifier of the PWM controller at a voltage proportional to the amplitude of the DC signal, or by offsetting the signal present on the current sensing resistor by a voltage corresponding to the difference between a constant voltage and the DC signal.
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