Power detection circuit and method of operating the same
AssigneeChicony Power Technology Co., Ltd.
InventorsSsu-Hao WANG, Tso-Jen PENG, Liang-Ting KUO, Mao-Song PAN
Life of this patent
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Abstract
A power detection circuit is configured in a power supply unit having a primary side and a secondary side. The power detection circuit includes a secondary-side controller, a first voltage detection circuit, a second voltage detection circuit, and a current detection circuit. The secondary-side controller calculates an output power according to an output voltage and an output current of the power supply unit, acquires a first efficiency value according to the output power and an efficiency conversion table inside the secondary-side controller, and calculates an input power of the power supply according to the first efficiency value and the output power.
Claims10
A power detection circuit configured in a power supply comprising a primary side and a secondary side, the power detection circuit comprising:
- a secondary-side controller configured in the secondary side,
- a first voltage detection circuit coupled to the secondary-side controller, and configured to provide a detection voltage according to a winding voltage of the secondary side,
- a second voltage detection circuit coupled to the secondary-side controller and an output terminal of the power supply, and configured to detect an output voltage of the output terminal, and
- a current detection circuit coupled to the secondary-side controller and the output terminal, and configured to detect an output current of the output terminal,
- wherein the secondary-side controller is configured to calculate an input voltage of the power supply according to the detection voltage, and acquire an efficiency conversion table under different output current conditions according to the input voltage;
- the secondary-side controller is configured to calculate an output power according to the output voltage and the output current, acquire a first efficiency value of the power supply under the output current conditions by comparing the output power with the efficiency conversion table, and calculate an input power of the power supply according to the first efficiency value and the output power.
A method of operating a power detection circuit, the power detection circuit configured in a power supply comprising a primary side and a secondary side, the method comprising steps of:
- detecting an output voltage and an output current of an output terminal of the power supply,
- providing a detection voltage according to a winding voltage of the secondary side,
- calculating an input voltage of the power supply according to the detection voltage, and acquiring an efficiency conversion table under different output current conditions according to the input voltage,
- calculating an output power according to the output voltage and the output current, and acquiring a first efficiency value of the power supply under the output current conditions by comparing the output power with the efficiency conversion table, and
- calculating an input power of the power supply according to the first efficiency value and the output power.
Dependencies are inferred from the claim text.