Load modulation circuit, power adapter and power adapter control method

A power adapter control method, comprising:

• obtaining, by a temperature sensing circuit, a temperature sensing voltage according to an internal temperature of a power adapter;
• obtaining, by a rectification sensing circuit, a rectification sensing voltage from a transformer circuit of the power adapter;
• determining, by a control circuit, whether the temperature sensing voltage exceeds a preset voltage range;
• generating an adjustment signal according to the rectification sensing voltage when the temperature sensing voltage exceeds the preset voltage range;
• and
• adjusting an output signal or an operating power of the power adapter according to the adjustment signal.

A power adapter, comprising:

• a transformer circuit;
• a control circuit coupled to the transformer circuit, and configured to control an output signal output from the transformer circuit to a load;
• a temperature sensing circuit coupled to the control circuit and a temperature sensing element of the power adapter, and configured to obtain a temperature sensing voltage according to an internal temperature of the power adapter, wherein the control circuit is configured to determine whether the temperature sensing voltage exceeds a preset voltage range;
• and
• a rectification sensing circuit coupled to the transformer circuit and the control circuit to provide a rectification sensing voltage to the control circuit;
• wherein when the temperature sensing voltage exceeds the preset voltage range, the control circuit is configured to generate an adjustment signal according to the rectification sensing voltage, and adjust the output signal according to the adjustment signal.