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IPM overcurrent protection method and circuit

A technology of overcurrent protection and phase difference, which is applied to emergency protection circuit devices, AC motor control, electrical components, etc., and can solve problems such as damage, IPM failure to protect normally, and short detection time

Inactive Publication Date: 2020-02-14
GUANGZHOU SHIYUAN ELECTRONICS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the dual-resistor sampling circuit, dual-resistance sampling does not involve phase-shift processing, and the three-phase output is synchronous output. When any two phases of the output three-phase line have a short-circuit fault, due to the upper bridge arm of one phase and the other There may be a very small phase difference in the lower bridge arm, resulting in too short detection time and energy accumulation, which eventually leads to damage to the IPM due to failure of normal protection

Method used

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  • IPM overcurrent protection method and circuit

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Embodiment Construction

[0050] In order to enable those skilled in the art to better understand the solution of the present application, the relevant technologies involved in the present application are firstly introduced.

[0051] figure 1 It is a schematic diagram of a control circuit of the permanent magnet synchronous motor involved in the embodiment of the present application, such as figure 1 As shown, the control circuit shown includes SVPWM, IPM and PMSW.

[0052] A permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSW) is a motor that uses permanent magnets instead of DC excitation as constant excitation, and consists of two parts: a custom part and a rotor.

[0053] Space Vector Pulse Width Modulation (SVPWM) is a special switching trigger sequence and pulse width corresponding to the three-phase voltage source inverter power device in the AC induction motor or permanent magnet synchronous motor. Combination, this switch trigger sequence and combination will generat...

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Abstract

Embodiments of the invention disclose an IPM overcurrent protection method and circuit. The method comprises the following steps: acquiring the phase difference between one phase and the other two phases corresponding to each sector; if the phase difference is smaller than a preset value, moving at least one of the two phases corresponding to the phase difference so as to allow the phase difference of the two phases to be greater than or equal to the preset value after movement; and inputting a shifted PWM control signal to an IPM so as to allow the IPM to control a motor according to the shifted PWM control signal. According to the embodiments of the invention, when the phase difference of the two phases is smaller than the preset value, the phase difference of the two phases is increasedin the manner of shifting, thereby guaranteeing that IPM overcurrent detection time can be satisfied under any condition when any two phases are short-circuited, avoiding the damage of the IPM, and improving the overcurrent protection efficiency of the IPM.

Description

technical field [0001] The present application relates to the technical field of automatic control, in particular to an IPM overcurrent protection method and circuit. Background technique [0002] At present, the mainstream permanent magnet synchronous motor drive circuit is divided into two methods: single resistor sampling and dual resistor sampling. In order to avoid the demagnetization problem of the permanent magnet synchronous motor due to overcurrent, there will be an overcurrent protection circuit. At present, an intelligent power module (Intelligent Power Module, IPM) is usually installed in a permanent magnet synchronous motor drive circuit for circuit protection. [0003] In the dual-resistor sampling circuit, dual-resistance sampling does not involve phase-shift processing, and the three-phase output is synchronous output. When any two phases of the output three-phase line have a short-circuit fault, due to the upper bridge arm of one phase and the other There m...

Claims

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Application Information

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IPC IPC(8): H02P27/08H02P29/032H02H7/20
CPCH02H7/205H02P27/085H02P29/032
Inventor 毕磊
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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