Over-current detection circuit, over-current detection method, over-current protection circuit and chip

The invention discloses an overcurrent detection circuit, an overcurrent detection method, an overcurrent protection circuit and a chip. The overcurrent detection circuit comprises a proportional current source, a current sampling circuit, a reference circuit and a comparison circuit; the proportional current source is used for generating first current and second current; the current sampling circuit is used for sampling a current flowing through an output stage circuit of the audio power amplifier and generating a sampling voltage related to the sampling current and a first current, and a current sampling element in the current sampling circuit is an MOS (Metal Oxide Semiconductor) tube; the reference circuit is used for generating a reference voltage related to the second current; the comparison circuit is used for comparing the sampling voltage with the reference voltage and sending an overcurrent indication signal when the sampling voltage is greater than the reference voltage. Based on the overcurrent de