H-bridge variable driving topological structure

Abstract

The invention provides an H-bridge variable driving topological structure. Suppose that the phase number of an open winding motor is 2N, and N is equal to or larger than 2, the power pack of the H-bridge variable driving topological structure comprises N direct-current power sources; each direct-current power source comprises a positive output terminal and a negative output terminal; the power switch set of the H-bridge variable driving topological structure comprises 2N power switches; the H-bridge set of the H-bridge variable driving topological structure comprises 4*2N power tubes, so as to form 2N H-bridges; each H-bridge comprises a left bridge arm and a right bridge arm which are divided by one open winding motor; each bridge arm is formed by connecting the drain electrode of a power tube with the source electrode of another power tube in series, while after connection in series, the drain electrode end of the bridge arm is connected with a power switch and then connected to the positive output terminal of a direct-current power source, and the source electrode end of the bridge arm is connected with another power switch and then connected to the negative output terminal of the corresponding direct-current power source; and a wiring terminal is arranged between the drain electrode and the source electrode, which are connected in series, of each bridge arm in each H-bridge, and is connected with a terminal of a winding of one open winding motor, and power of two H-bridges corresponding to windings of the same function are supplied by the same direct-current power source.

Description

technical field [0001] The invention relates to the field of motor drive control, in particular to an H-bridge variable structure drive topology. Background technique [0002] In the motor drive, the topology of the driver generally adopts a three-phase full-bridge structure, that is, six power tubes form three bridge arms, and the middle point of each bridge arm is connected to each phase winding terminal of the motor. The advantage of this topology is that the number of power devices is small, the volume is small, and the cost is low, but its disadvantages are also very obvious. Only one of the power tubes fails, and due to the constraint that the sum of the three-phase currents is zero, the other five power tubes Tubes will not work properly, so this topology is inflexible and cannot be reconfigured after a failure. [0003] In order to overcome the shortcomings of the three-phase full-bridge drive topology, an independent H-bridge structure is generally used, that is, t...

AI Technical Summary

Problems solved by technology

However, this independent H-bridge structure overcomes the shortcomings of the three-phase full-bridge structure, and has certain flexibility and can perform fault reconstruction. However, its structure is fixed and cannot better meet the wide range of motor systems. Use requirements, such as high speed, low speed, light load, heavy load, fault and other working conditions

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