Method, device, equipment, vehicle and medium for controlling three-level inverter

By controlling the back EMF position of the three-phase branch, the problem of phase current overcurrent occurs when the three-level inverter is switched, and the effect of protecting the motor and inverter is achieved.

CN119652095APending Publication Date: 2025-03-18ROBERT BOSCH GMBH
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Patent Information

Application Number
CN202311207084.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-18
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

When switching from sliding mode to active short circuit mode, the three-level inverter may cause phase current to overcurrent and damage the motor and inverter.

Method used

By controlling the back EMF position of the three-phase branch, it does not enter the active short circuit mode at the same time. The specific method is to control the second phase branch and the third phase branch to enter the active short circuit mode at the same time during the sliding mode, and control the first phase branch to enter the active short circuit mode based on the back EMF position.

Benefits of technology

The phase current peak is reduced, and the phase current overcurrent of the three-level inverter is avoided, thereby protecting the motor and inverter.

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Abstract

The embodiment of the invention relates to a method, device and equipment for controlling a three-level inverter, a vehicle and a medium. The method includes controlling a second phase branch and a third phase branch in a three-phase branch to enter an active short circuit (ASC) mode simultaneously based on a back electromotive force of the three-phase branch of the three-level inverter at a first position when the three-level inverter is in a glide (FW) mode. The method further includes controlling a first phase branch of the three-phase branches to enter an ASC mode based on the back electromotive force being located at a second position different from the first position. According to the method disclosed by the embodiment of the invention, the three-phase branch can enter the ASC mode at different moments, and the peak value of the phase current is reduced, so that the overcurrent of the phase current of the three-level inverter is avoided.
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