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Motor controller, IGBT over-temperature protection method and apparatus for same

A motor controller and over-temperature protection technology, which is applied to power-consuming devices, control drives, power management, etc., can solve the problems of high real-time requirements of sampling circuits, protection lag, and IGBT over-temperature damage, etc. The effect of solving hysteresis, reducing the risk of over-temperature damage

Active Publication Date: 2016-02-17
BYD CO LTD
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Problems solved by technology

However, this solution requires high real-time performance of the sampling circuit. The IGBT temperature sampling resistor itself has a delay. When the circuit delay is large, there will be a protection lag. When the temperature changes sharply or the temperature changes suddenly, the risk of IGBT over-temperature damage higher

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  • Motor controller, IGBT over-temperature protection method and apparatus for same
  • Motor controller, IGBT over-temperature protection method and apparatus for same
  • Motor controller, IGBT over-temperature protection method and apparatus for same

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Embodiment Construction

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0024] The main problem of the IGBT over-temperature protection scheme currently used in the electric vehicle market is hysteresis, that is, it cannot realize real-time monitoring and real-time protection of the IGBT temperature. Secondly, the requirements for hardware circuits are high, and the risk of false protection is high.

[0025] However, the root cause of the hysteresis is that there is a large delay in the temperature sensing device, which makes the protection lag, low sensitivity, and slow response; the higher requirem...

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Abstract

The invention discloses an IGBT over-temperature protection method and apparatus for a motor controller and a motor controller are provided. The method comprises steps of detecting a current output current signal of the motor controller and a current whole-vehicle input signal input to the motor controller, calculating current time IGBT temperature rise according to the current output current signal and a pre-set IGBT temperature rising model and calculating corresponding temperature according to the temperature rise, calculating an output current signal of the motor controller of next time according to the current output current signal and the current whole-vehicle signal, calculating temperature rise of the IGBT of the next time according to the signal and the above model, calculating the temperature of the IGBT of the next time according to the next time temperature rise and the current temperature, and outputting an over-temperature protection signal to enable an IGBT over-temperature circuit to work when the next time temperature is larger than the preset temperature. IGBT over-temperature damage risk can be reduced and reliability can be improved, by the use of the IGBT over-temperature protection method and apparatus.

Description

technical field [0001] The present invention relates to the technical field of electric vehicles, in particular to an IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) overtemperature protection method and device for a motor controller and a motor controller. Background technique [0002] The inverter mainly relies on the conversion function of IGBT to realize the conversion between DC and AC. The loss of IGBT is one of the important factors affecting the life and reliability of IGBT. The main reason is that it is related to its switching frequency and operating conditions, such as DC side voltage and AC output current, which will directly lead to the increase of IGBT loss. [0003] During the operation of electric vehicles, under certain working conditions (such as braking, acceleration, etc.), the IGBT wafer in the electric vehicle motor controller will heat up rapidly, and even a sudden temperature change will occur, which can easily cause IGBT o...

Claims

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Application Information

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IPC IPC(8): B60L3/00B60L15/20
CPCY02T10/72
Inventor 杨广明喻轶龙李辉
Owner BYD CO LTD
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