POWER SUPPLY CONTROL CIRCUIT, A POWER SUPPLY CONTROL METHOD, AND A FLYBACK SWITCHING POWER SUPPLY
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United States of America Patent
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Issued Date -
Apr 18, 2024
app pub date -
Nov 21, 2023
filing date -
Nov 22, 2022
priority date (Note) -
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status (Latency Note)
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Abstract
The application discloses a power supply control circuit, a power supply control method, and a flyback switching power supply. The power supply control circuit is configured to power a wide voltage output circuit, having an input terminal coupled to an input voltage, having an output terminal configured to output a power supply voltage. The power supply control circuit comprises a boost circuit, the boost circuit comprising a first switch tube and a switch control circuit, the switch control circuit coupled to a control terminal of the first switch tube. The switch control circuit is configured to control the first switch tube to start switching action when the input voltage is less than a preset voltage, and configured to control the first switch tube to stop switching action when the input voltage is greater than the preset voltage. The switch control circuit comprises a charge and discharge circuit, a first comparison circuit and a trigger circuit. The application discloses a power supply control circuit, a power supply control method, and a flyback switching power supply, which can reduce the voltage withstanding of chip devices, thereby reducing chip cost, and realize stable switching of system between full load state and light load state.
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