A control method, device, and motor control device for a three-level motor driver

Abstract

Embodiments of the present invention provide a control method, device and motor control equipment for a three-level motor driver. Wherein, the method includes: when the motor is in the electric mode, detecting the first DC support capacitor C 1 The terminal voltage U 1 and the second DC support capacitor C 2 The terminal voltage U 2 ; Judgment U 1 -U 2 Is it greater than the preset control threshold UM; when U 1 -U 2 When it is greater than UM, judge whether the current working state of each single-phase bridge arm is the upper half-bridge drive; if it is not the upper half-bridge drive, switch to the upper half-bridge drive; control the second power tube and the third power tube during the switching process tube conduction; when U 1 -U 2 is not greater than UM, if U 1 -U 2 is less than ‑UM, judge whether the current working state of each single-phase bridge arm is the lower half-bridge drive; if not, switch to the lower half-bridge drive; control the second and third power transistors during the switching process Pass. Through this solution, the versatility of the three-level motor driver can be improved.

Description

technical field [0001] The invention relates to the technical field of three-level topology motor drive, in particular to a control method, device and motor control equipment for a three-level motor driver. Background technique [0002] An existing motor control system generally includes a motor control device, a three-level motor driver and a motor, and the three-level motor driver includes an inverter circuit. The motor control device controls the motor to work by sending control signals to the power tubes (such as MOSFET, IGBT, etc.) of the inverter circuit. [0003] Currently, the commonly used control methods for three-level motor drivers are sinusoidal pulse width modulation (SPWM, Sinusoidal Pulse Width Modulation) and space vector pulse width modulation (SVPWM, Space Vector Pulse Width Modulation). Since the control method of the existing three-level motor driver is adopted, the DC bus voltage of the inverter circuit is ±U dc 、±U dc / 2 and 0 five levels, therefore...

AI Technical Summary

Problems solved by technology

In other words, the existing control method of the three-level motor driver makes the three-level motor driver unsuitable for rated voltages less than the maximum voltage of the input DC bus of the three-level motor driver ±U dc The range of motors that the three-level motor driver can apply to is narrow, and the versatility is low

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