Motor active short circuit control circuit and driving method thereof

Abstract

The invention discloses a motor active short circuit control circuit and a driving method thereof. The circuit comprises a driving power supply, an active short-circuit driving circuit, a first driving circuit, a second driving circuit, a first bridge arm circuit, a second bridge arm circuit, a first detection circuit and a second detection circuit, the driving power supply provides low-voltage voltage signals for the first driving circuit and the second driving circuit; the first detection circuit obtains first state information of each transistor in the first bridge arm circuit; the second detection circuit obtains second state information of each transistor in the second bridge arm circuit; the active short-circuit driving circuit obtains a voltage signal of a three-phase bus of the motor and a power-down signal of a low-voltage power supply, and respectively provides a driving control signal for the first driving circuit and the second driving circuit according to the voltage signal and the electric signal; the first driving circuit drives each transistor in the first bridge arm circuit to be switched on or switched off according to the driving control signal and the first state information; and the second driving circuit drives each transistor in the second bridge arm circuit to be switched on or switched off according to the driving control signal and the second state information.

Description

technical field [0001] Embodiments of the present invention relate to motor technology, in particular to a motor active short-circuit control circuit and a driving method thereof. Background technique [0002] Most electric vehicles are powered by batteries. During the driving of electric vehicles, if the motor controller is abnormally powered off by the low-voltage battery, the existing power device drives with power-down protection are generally based on high-voltage backup power supplies, which trigger active short circuits. In order to realize the protection, the drive circuit will control the lower three tubes or the upper three tubes to conduct simultaneously during the active short circuit process. If the speed of the motor is relatively high at this moment or the motor is driven by other components, the three tubes where the power switching device is always on may be damaged due to over-temperature or over-current. Contents of the invention [0003] The invention ...

AI Technical Summary

Problems solved by technology

If the speed of the motor is relatively high at this moment or the motor is driven by other components, the three tubes that the power switch device is always on may be damaged due to over-temperature or over-current.

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