Double-path bidirectional magnetic bearing suspension current control circuit and method based on three bridge arms

The invention discloses a three-bridge-arm-based double-path bidirectional magnetic bearing suspension current control circuit and method, and the circuit comprises a control unit which is used for generating eight paths of control signals according to an upper given current and a feedback current of a magnetic bearing; the bridge arm assembly comprises a first bridge arm, a second bridge arm and a multiplexing bridge arm, the windings of the two-way magnetic bearing are correspondingly connected between the multiplexing bridge arm and the first bridge arm and between the multiplexing bridge arm and the second bridge arm, and each of the first bridge arm, the multiplexing bridge arm and the second bridge arm comprises at least two MOS (Metal Oxide Semiconductor) tubes; all the MOS tubes in the first bridge arm are controlled by one path of control signal, all the MOS tubes in the second bridge arm are controlled by one path of control signal, and the MOS tubes in the multiplexing bridge arm are controlled by