A current detection circuit for detecting a working current of a power conversion device is provided. The current detection circuit includes a sampling unit which includes at least two sampling input terminals, a sampling reference terminal, and at least one sampling output terminal. The sampling reference terminal is electrically connected to a first voltage terminal of the power conversion device, and the at least two sampling input terminals are respectively connected to first ends of corresponding windings included in the power conversion device. The sampling unit is configured to sample voltage drops at two ends of the corresponding windings, and configured to obtain an output signal by summing and averaging sampled voltage drops, and configured to output an output signal via the at least one sampling output terminal. The output signal is proportional to a working current of the power conversion device.