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Longevity diagnostic device of power conversion apparatus

A technology of a power conversion device and a diagnostic device, which is applied to measuring devices, measuring electrical variables, converting irreversible DC power input into AC power output, etc., and can solve problems such as rising maintenance and management costs of power conversion devices

Inactive Publication Date: 2009-09-16
TOSHIBA ELEVATOR KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, in the different usage environments of each user, especially for power conversion devices with low usage frequency and repeated duty cycle usage conditions, although there is a remaining life of the switching element, it is necessary to replace the switch due to the period of regular replacement. The maintenance and management costs of components and power conversion equipment have risen sharply

Method used

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  • Longevity diagnostic device of power conversion apparatus
  • Longevity diagnostic device of power conversion apparatus
  • Longevity diagnostic device of power conversion apparatus

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Experimental program
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no. 1 Embodiment approach

[0046] figure 1 It is a schematic configuration diagram of a power conversion device incorporating the lifetime diagnosis device according to the first embodiment of the present invention. for with Figure 14 In the shown conventional power conversion device, the same parts are denoted by the same reference numerals, and detailed description of the overlapping parts will be omitted.

[0047] The power conversion device of the first embodiment is composed of a power conversion unit 2 and a conversion control unit 15 . In the power conversion unit 2 , the three-phase AC power supplied from the AC power source 1 is input to the power conversion unit 2 composed of a converter 3 and an inverter 5 . The converter 3 is composed of bridge-connected rectifying elements such as diodes. Also, the input three-phase AC power is full-wave rectified into DC power by the converter 3 , and then the fluctuation component included in the DC power is removed by the smoothing capacitor 4 .

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no. 2 Embodiment approach

[0072] Image 6 It is a schematic configuration diagram of a power conversion device incorporating the lifetime diagnosis device according to the second embodiment of the present invention. for with figure 1 The same parts of the power conversion device according to the first embodiment shown are denoted by the same reference numerals, and detailed description of overlapping parts will be omitted.

[0073] In the power conversion device of the second embodiment, a temperature sensor 33 for detecting the temperature Ta of the atmosphere 32 is provided outside the inverter 5 in the power conversion unit 2 . The detection signal of this temperature sensor 33 is input into the temperature detection part 34 provided inside the conversion control part 15a. The temperature detection unit 34 obtains the temperature Ta of the air 32 outside the inverter 5 based on the detection signal of the temperature sensor 33 , and sends it to the deterioration degree evaluation correction unit ...

no. 3 Embodiment approach

[0078] Figure 7 It is a schematic configuration diagram of a power conversion device incorporating the lifetime diagnosis device according to the third embodiment of the present invention. for with figure 1 The same parts of the power conversion device according to the first embodiment shown are given the same reference numerals, and detailed description of overlapping parts will be omitted.

[0079] In this third embodiment, an evaluation result transmitting unit 36 ​​is provided inside the conversion control unit 15b, and the evaluation result transmitting unit 36 ​​transmits the evaluation result of the degree of deterioration evaluated by the deterioration degree evaluating unit 36 ​​to the outside through a communication line. monitoring center37.

[0080] In the lifetime diagnosis device of the third embodiment configured in this way, if the calculated thermal resistance R exceeds the preset threshold value R Y , the monitoring center 37 is notified of the warning o...

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PUM

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Abstract

The present invention relates to a longevity diagnostic device for a power conversion apparatus. A temperature sensor (14) is mounted in a casing of switch elements (6, 6a) for forming an inverter (5) and a converter (3) of the power conversion apparatus, the switch elements are controlled by a PWM signal from a conversion control part (15), and a test electric force with a prescribed frequency and current is outputted from the inverter (5). The heat outputted from a node of the switch element (6) is definite at this status, thus a heat resistance (R) between components forming the switch element (6) is calculated based on a temperature inside the casing detected by the temperature sensor (14), and the impairment grade of the components is evaluated based on the heat resistance.

Description

technical field [0001] The present invention relates to a power conversion device, which is composed of a converter (converter) for converting input AC into DC and an inverter (inverter) for converting DC converted by the converter into AC and outputting it. In particular, it relates to a life diagnosis device for a power conversion device that evaluates the degree of deterioration of switching elements incorporated in inverters and converters. Background technique [0002] As a method of controlling the speed and torque of AC motors in a wide range, power conversion devices have been put into practical use. In this power conversion device, the alternating current supplied from the alternating current power supply is converted into direct current by the inverter. In addition, this direct current is converted into alternating current by an inverter. In addition, this AC is supplied to an AC load such as an AC motor. [0003] Figure 14 It is a structural diagram of a gener...

Claims

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Application Information

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IPC IPC(8): G01R31/28G01R31/27H02M7/48H02P27/06
Inventor 竹田顺二
Owner TOSHIBA ELEVATOR KK