Single-magnetic-core multi-winding magnetic balance type current detection device

The invention relates to a single-magnetic-core multi-winding magnetic balance type current detection device. The single-magnetic-core multi-winding magnetic balance type current detection device comprises an excitation current source (1), a demagnetization current source (2), a first switch (3), a second switch (4), a magnetic ring (5), an excitation coil (6), a first detection coil (7), a seconddetection coil (8), a compensation coil (9), a first signal collector (10), a second signal collector (11), a first low-pass filter (12), a second low-pass filter (13), a differentiator (14), a band-pass filter (15), an amplitude detector (16), an adjuster (17), a driver (18), a compensation current source (19) and a sampling resistor (20). According to the single-magnetic-core multi-winding magnetic balance type current detection device, the structure of the single magnetic ring, a single excitation winding, a double detection winding and the additional compensation coil is adopted, the magnitude of current penetrat