Control circuit capable of detecting status of receiving power and decreasing voltage of capacitor accordingly
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United States of America Patent
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Nov 27, 2018
Grant Date -
Nov 22, 2018
app pub date -
May 17, 2018
filing date -
May 22, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A control circuit includes a set of alternating-current (AC) power receiver terminals, a rectification unit, a transistor, a switch, a detection unit, a comparison unit and a logic control circuit. The AC power receiver terminals receive and send external AC power to the rectification unit. The rectification unit outputs an operation voltage accordingly. The transistor is coupled between the rectification unit and the switch. The detection unit is coupled to the rectification unit to generate a first detection voltage and a second detection voltage according to the operation voltage. When the first detection signal is equal to the second detection signal, the comparison unit sends a comparison signal. The logic control circuit turns on the transistor and the switch if the comparison signal still has not been received after a predetermined time interval has elapsed.
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