Detection circuit for power supply circuit

A detection circuit for a power supply circuit, wherein the power supply circuit comprises a thermal circuit, the thermal circuit is coupled to one of input pins of an AC power input terminal of the power supply circuit, and the detection circuit comprises:

• a reference circuit, coupled to the thermal circuit through a connection pin, and configured to provide a temperature reference signal;
• a voltage detection circuit, coupled to the connection pin and the reference circuit, and configured to:
• enter a sampling mode to stop the reference circuit from providing the temperature reference signal, and sample a single-phase AC input power located at the input pin through the connection pin,
• enter a hold mode to store a peak value information and enable the reference circuit to provide the temperature reference signal when the peak value information of the single-phase AC input power is sampled;
• and
• a determination circuit, coupled to the connection pin, configured to provide at least one of a waveform detection signal and an over-voltage detection signal in response to the peak value information, and providing an over-temperature detection signal in the hold mode according to at least one of an output signal and the peak value information generated by the thermal circuit in response to the temperature reference signal.