Power Controllers, Power Supplies and Control Methods Therefor
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United States of America Patent
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Issued Date -
Feb 6, 2014
app pub date -
Jul 17, 2013
filing date -
Jul 31, 2012
priority date (Note) -
Abandoned
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Abstract
Disclosure includes an exemplified power controller for controlling a power switch in a power supply. The power supply converts an input power source into an output power source. The exemplified power controller comprises a maximum frequency maker, a voltage detector, and a logic circuit. Based on dependence of a maximum switching frequency upon a compensation signal, the maximum frequency maker provides a control signal with a minimum switching cycle. The compensation signal correlates to an output power from the output power source, and the minimum switching cycle is the reciprocal of the maximum switching frequency. The voltage detector detects a line voltage of the input power source. The logic circuit controls the power switch in response to the control signal, and makes a switching cycle of the power switch not less than the minimum switching cycle. The line voltage determines the dependence.
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