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Method of estimating inverter capacitor life

A frequency converter and capacitor technology, applied in the field of frequency converters, can solve the problems of increased parasitic resistance ESR, performance degradation of electrolytic frequency converter capacitors, and reduction of capacitance of static frequency converters, etc., to improve reliability, facilitate capacitor life, and facilitate estimation Effect

Inactive Publication Date: 2020-05-01
珠海汇众能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance degradation of electrolytic inverter capacitors is mainly characterized by the reduction of static inverter capacitance and the increase of parasitic resistance ESR

Method used

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  • Method of estimating inverter capacitor life
  • Method of estimating inverter capacitor life
  • Method of estimating inverter capacitor life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Example 1: limited conditions, set the basic parameters of the inverter to 650uF / 550V, query the inverter capacitor manual to get the working life of the inverter capacitor is 3000 hours, query the inverter capacitor user manual marked with the inverter capacitor Rated temperature and rated temperature rise, wherein, the rated temperature is 105°C, and the rated temperature rise is 5°C. Use a temperature measuring instrument to measure the actual ambient temperature of the inverter capacitor, take the average value of the three temperature sensors at 55°C, and set the The inverter capacitor is used in a 400V / 50Hz circuit with an environment of 55°C. When the ambient temperature is 55°C, use a temperature measuring instrument to measure the heat value generated by the ripple current inside the inverter under the working state of the inverter to 20°C. According to the formula:

[0065]

[0066] Calculated:

[0067]

[0068] Through the above formula, the life of th...

Embodiment 2

[0069] Example 2: limited conditions, set the basic parameters of the inverter to 650uF / 550V, query the inverter capacitor manual to get the working life of the inverter capacitor is 4000 hours, query the inverter capacitor user manual marked with the inverter capacitor Rated temperature and rated temperature rise, in which, the rated temperature is 95°C, and the rated temperature rise is 7°C. Use a temperature measuring instrument to measure the actual ambient temperature where the inverter capacitor works, take the average value of the three temperature sensors at 50°C, and set the The inverter capacitor is used in a 400V / 50Hz circuit with an environment of 50°C. When the ambient temperature is 50°C, use a temperature measuring instrument to measure the heat value generated by the ripple current inside the inverter under the working state of the inverter to be 18°C. According to the formula:

[0070]

[0071] Calculated:

[0072]

[0073] Through the above formula, th...

Embodiment 3

[0074] Example 3: limited conditions, set the basic parameters of the inverter to 650uF / 550V, query the inverter capacitor manual to get the working life of the inverter capacitor is 6000 hours, query the inverter capacitor user manual marked with the inverter capacitor Rated temperature and rated temperature rise, wherein, the rated temperature is 125°C, and the rated temperature rise is 5°C. Use a temperature measuring instrument to measure the actual ambient temperature where the inverter capacitor works, take the average value of the three temperature sensors at 65°C, and set the The inverter capacitor is used in a 400V / 50Hz circuit with an environment of 65°C. When the ambient temperature is 65°C, use a temperature measuring instrument to measure the heat value generated by the ripple current inside the inverter under the working state of the inverter to be 23°C. According to the formula:

[0075]

[0076] Calculated:

[0077]

[0078] Through the above formula, th...

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Abstract

The invention discloses a method of estimating inverter capacitor life. According to the method, three temperature measuring instruments are arranged close to the head, middle and tail of a capacitorrespectively inside an inverter, and a mean value is acquired to obtain capacitor working temperature. The method comprises the sequential steps that an inverter capacitor manual is inquired to obtainworking rated life, rated temperature and rated temperature rise of the inverter capacitor; actual environmental temperature during working of the inverter capacitor is measured, and the mean value of three temperature sensors is acquired; the temperature of the inverter working under rated power is measured, and the mean value of the three temperature sensors is acquired; and the capacitor service life of the inverter is obtained through calculation. Through the method, the capacitor service life can be estimated rapidly and effectively and is used for intelligent early-warning, the reliability of the inverter product is improved, and therefore it is convenient for an operator to estimate the capacitor life of the inverter.

Description

technical field [0001] The invention relates to the field of frequency converters, in particular to a method for estimating the service life of frequency converter capacitors. Background technique [0002] The frequency converter is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply. [0003] The frequency converter is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit and micro-processing unit. The inverter adjusts the voltage and frequency of the output power supply by switching on and off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter also has many protection functions. , such as overcurrent, overvoltage, overload protec...

Claims

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Application Information

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IPC IPC(8): G01R31/00H02M5/42
CPCG01R31/00H02M5/42
Inventor 张亮
Owner 珠海汇众能源科技有限公司