Three-phase inverter circuit for driving three-phase AC motor and its vector modulation control method

Abstract

The invention provides a three-phase inverter circuit for driving a three-phase AC motor and a vector modulation control method thereof, wherein the three-phase inverter circuit for driving the three-phase AC motor comprises the components of a DC power supply which is provided with an anode and a cathode; a first switch transistor arm which is composed of a first transistor and a second transistor that are serially connected; a second switch transistor arm which is composed of a third transistor and a fourth transistor that are serially connected; a third switch transistor which is composed of a fifth transistor and a fast recovery diode that are serially connected; and a motor which comprises a first phase, a second phase and a third phase, wherein one selected from the first phase, the second phase and the third phase is connected with the middle point of the third switch transistor arm. The other two phases of the motor are respectively connected with the middle point of the first switch transistor arm and the middle point of the second switch transistor arm. The three-phase inverter circuit and the vector modulation control method thereof can reduce cost of a traditional three-phase AC motor driving circuit and facilitate expanding of application range of the three-phase AC motor driving circuit.

Description

Technical field [0001] The invention relates to a motor drive control technology, in particular to a drive control circuit of a three-phase AC motor, in particular to a three-phase inverter circuit for driving a three-phase AC motor and a vector modulation control method thereof. Background technique [0002] At present, in order to reduce the cost of the three-phase AC motor drive system while maintaining the main performance of the system, the following treatment methods are usually adopted: 1) reduce the number of switching devices in the drive system circuit; 2) use derating of components; the above two Although the method can achieve a certain degree of reduction in the circuit cost of the drive system, the degree of freedom of control of the three-phase AC motor will be reduced, and the performance of the drive system may also be reduced, resulting in the limitation of the robustness of the drive system. [0003] For this reason, researchers in the field use novel control alg...

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Problems solved by technology

[0004] However, the first method is easy to increase the complexity and cost of the drive system circuit structure, and the additional detection and protection circuits required will bring additional component costs, thus failing to meet the cost reduction requirements; the various improved methods in the second method The closed-loop control algorithm, due to the complexity of the algorithm, reduces the robustness of the drive system; for example, when the midpoint imbalance of the DC bus voltage is too large, it will greatly affect the life of the DC capacitor and the life and efficiency of the motor, and may burn out in severe cases DC capacitor or motor

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