Full-cycle current detection circuit

The invention relates to the field of microelectronics technology, and particularly relates to a full-cycle current detection circuit. The full-cycle current detection circuit comprises an inductive current rising pattern current detection circuit and an inductive current declining pattern current detection circuit. According to the technical scheme of the invention, the full-cycle current detection circuit is designed based on the circuit multiplexing manner, thus being simple in structure, small in circuit size and low in power consumption. In the inductive current rising detection mode, the channel resistance of a power MOS transistor is adopted as the sampling resistance, so that the power loss caused by the extra adoption of the sampling resistance can be eliminated. In the inductive current declining detection mode, the inductive current can be sampled based on the current mirror detection method. The value of the sampled current is equal to the value of the inductive current that is scaled down by 4000 times. Therefore, the power consumption of the sampling circuit is reduced.