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Electric power convertion device

A technology of a power conversion device and a power conversion circuit, which is applied to circuit devices, output power conversion devices, emergency protection circuit devices, etc., can solve problems such as no consideration, and achieve the effect of convenience in use, easy maintenance and detection

Inactive Publication Date: 2012-07-04
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Patent Document 1 discloses a structure for prolonging the life of the cooling fan, and Patent Document 2 discloses a structure for protecting the power supply circuit when the fan motor fails, but does not take into account the temperature rise of the object to be cooled. Judgment of the cause, or matters related to the shutdown of the equipment using the power conversion device

Method used

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  • Electric power convertion device
  • Electric power convertion device
  • Electric power convertion device

Examples

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Embodiment Construction

[0030] Using a power conversion device capable of supplying AC power of variable voltage and variable frequency to an AC motor as an example, a structure for detecting a short-circuit failure of a cooling fan included in the power conversion device and shutting off a power supply circuit for the cooling fan will be described. By cutting off the power supply of the cooling fan, the secondary damage to the power supply circuit caused by the short-circuit current caused by the short-circuit fault of the cooling fan can be avoided. Therefore, it is possible to use a power conversion device capable of greatly reducing the time during which the equipment is not in operation. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] figure 1 It is a main circuit configuration diagram of the power conversion device according to the embodiment of the present invention. The power conversion device of this embodiment, as a power conver...

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Abstract

The invention provides a power converting device which can achieve the convenient use property of the device no matter used in whatever environments. In order to achieve the proposal of the invention, the invention comprises a power converting circuit (1 to 3) which supplies an AC motor (4) with AC power with variable voltage and variable frequency; a cooling fan (6) arranged for cooling the cooling fin of a power semiconductor carried with the power converting circuit (1 to 3); and a semiconductor switch for driving and stopping the cooling fan (6) in the power supplying circuit of the cooling fan (6); and a detection circuit for detecting the abnormities such as short failure of the cooling fan (6). The detection circuit cuts the power supply of the cooling fan (6) off if detecting any short abnormity.

Description

technical field [0001] The present invention relates to power conversion devices. Background technique [0002] Since a large loss occurs in the power semiconductor in the power conversion device, a structure is adopted to cool the heat generated by the loss. That is, a cooling fin and a cooling fan (fan) are provided so that heat from a power semiconductor as a heat generating body is conducted to the cooling fin, and air is sent to the cooling fin by the cooling fan for heat exchange. Exothermic. [0003] In Patent Document 1 (Japanese Unexamined Patent Publication No. 7-154976), in order to extend the life of the cooling fan, the temperature on the cooling fins on which each module composed of power semiconductors is mounted is detected, and the temperature is determined according to the detected temperature value. Control the start or stop of the cooling fan. By performing such control, the degree of deterioration of the cooling fan is reduced, thereby prolonging the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M1/00G05D23/19H02H7/085
CPCH02H1/0007H02H5/04H02H7/10
Inventor 毛江鸣井堀敏龟泽友哉广田雅之平贺正宏
Owner HITACHI IND EQUIP SYST CO LTD