Detection circuit and power correction circuit for discharging current of inductor

The utility model discloses a detection circuit and a power correction circuit for the discharging current of an inductor. The detection circuit comprises the components as following: an input terminal, which is connected to the first terminal of the secondary windings of the inductor for acquiring the discharging current of the inductor; a DC source; a transistor, the first terminal of which is connected to an input terminal, and the second terminal is connected to the DC source; an output terminal, which is connected to a first node, wherein the first node is the node between the second terminal of the transistor and the DC source; and a signal processor, which is connected to the output terminal for determining whether the discharging current is zero according to the output signal of the output terminal. According to the utility model, the problem that the structure of the detection circuit for detecting the current over-zero signal of the inductor is complex is solved thereby the structure of the detection circuit is simplified, and production cost is reduced.