Drive motor controller discharge support circuit, control method and motor controller

Abstract

The invention relates to the technical field of electric vehicles, in particular to a driving motor controller discharge supporting circuit, a control method and a motor controller. The driving motorcontroller discharge supporting circuit comprises a support capacitor, a high-voltage power supply unit and a discharge unit; the high-voltage power supply unit comprises a first high-voltage power supply and a second high-voltage power supply; when a main contactor is disconnected, at least one of the first high-voltage power supply and the second high-voltage power supply outputs support voltageto the discharge unit; when the current voltage of the support capacitor is smaller than a first preset voltage, the first high-voltage power supply and the second high-voltage power supply stop outputting the support voltage to the discharge unit; and the discharge unit performs active discharge when the high-voltage power supply unit operates. According to the drive motor controller discharge support circuit, the corresponding support voltage is provided for the discharge unit according to the current voltage of the support capacitor, so that the discharge unit effectively executes the active discharge function, the voltage of the support capacitor is always maintained below the preset voltage, and the working efficiency of the drive motor controller is not influenced while the reliableactive discharge function is realized.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a drive motor controller discharge support circuit, a control method and a motor controller. Background technique [0002] In the event of a vehicle collision and a low-voltage power failure, the drive motor controller needs to use a high-voltage power supply unit to support the active discharge function. The current drive motor controllers basically use switching power supply or linear power supply as the high-voltage power supply unit supporting the active discharge function. When the permanent magnet synchronous motor rotates at a high speed, it only relies on a single high-voltage power supply unit before the permanent magnet synchronous motor stops. There is no guarantee that the active discharge function will effectively reduce and maintain the support capacitor voltage below a safe voltage (typically 60V). Using a linear power supply as the high-voltage power su...

AI Technical Summary

Problems solved by technology

Therefore, for the case of "low-voltage power failure after vehicle collision, and permanent magnet synchronous motor speed is high", there is currently no solution to effectively reduce the voltage of the supporting capacitor and maintain it at the high-voltage safety target

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