Active discharge closed-loop control circuit of electric vehicle motor controller

A technology of closed-loop control circuit and motor controller, which is applied in electric vehicles, control drives, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., to achieve the effect of stable discharge current and increased discharge current

Pending Publication Date: 2021-05-04
华域麦格纳电驱动系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot meet the requirement that the minimum resistance resistor can limit the discharge at the rated discharge power at a higher bus voltage, and can still meet the requirements of the rated discharge power at a lower bus voltage

Method used

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  • Active discharge closed-loop control circuit of electric vehicle motor controller
  • Active discharge closed-loop control circuit of electric vehicle motor controller
  • Active discharge closed-loop control circuit of electric vehicle motor controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This control circuit adopts the double closed-loop control loop of bus voltage feedback control outer loop and discharge current control inner loop to make the discharge resistor work in the rated discharge power range, which solves the problem of unbalanced discharge power due to excessive discharge current at the front end and small discharge current at the rear end Case.

[0026] Such as figure 1 and 2 As shown, the present invention provides an active discharge closed-loop control circuit for an electric vehicle motor controller, including a bus capacitor C arranged between the positive pole and the negative pole of the DC bus, and a discharge resistor R1 and a switch tube connected in series at both ends of the bus capacitor C in parallel. T1, the control circuit also includes a sampling comparison control component for controlling the PWM duty ratio of the switching tube T1, the sampling comparison control component sequentially includes a voltage sampling compa...

Embodiment 2

[0033] The control circuit can also use a microcontroller MCU to replace the current and voltage error amplifier and the clock triangle wave generator. Input the bus voltage and discharge current feedback signals to the ADC digital-analog converter of the MCU to obtain digital signals, and the MCU outputs the PWM signal to control the switching tube after the algorithm compensation operation, so that the discharge current is stable and the discharge power is kept balanced. The rest of the components and implementation Example 1 is consistent.

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PUM

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Abstract

The invention relates to an active discharge closed-loop control circuit for a motor controller of an electric vehicle. The active discharge closed-loop control circuit comprises a bus capacitor arranged between the positive electrode and the negative electrode of a direct-current bus, a discharge resistor and a switch tube which are connected in series at the two ends of the bus capacitor in parallel, and a sampling comparison control assembly for controlling the PWM duty ratio of the switch tube, wherein the sampling comparison control assembly sequentially comprises a voltage sampling comparison unit, a current sampling comparison unit and a PWM duty ratio control unit. Compared with the prior art, the active discharge closed-loop control circuit has the advantages of double closed-loop control, stable discharge power and the like.

Description

technical field [0001] The invention relates to the field of electric vehicle motor control, in particular to an active discharge closed-loop control circuit for an electric vehicle motor controller. Background technique [0002] The energy dissipation of the bus capacitor in the motor controller needs to be discharged through the connection of the discharge resistor, and the discharge current decreases in a logarithmic function, getting smaller and smaller, and finally lower than the required safe setting value. Such as image 3 and 4 As shown, the existing solutions in the field control the opening of the switch tube, and the resistor starts to discharge. In order to avoid excessive discharge current, a larger resistance resistor is used to discharge, but the discharge time is long. If a resistor with a smaller resistance is used to discharge in order to shorten the discharge time, the discharge current in the front stage is too large and the power of the resistor is als...

Claims

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Application Information

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IPC IPC(8): H02H9/04B60L15/00
CPCB60L15/00H02H9/04
Inventor 聂苏朱志勇
Owner 华域麦格纳电驱动系统有限公司
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