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Device and method for limiting junction temperature and reducing loss of traction converter switching device

A traction converter and switching device technology, applied in output power conversion devices, electrical components, high-efficiency power electronic conversion, etc., can solve problems such as inability to reach and limit the maximum junction temperature of IGBTs

Inactive Publication Date: 2020-01-21
CRRC TANGSHAN CO LTD +1
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AI Technical Summary

Problems solved by technology

However, there are still many problems in the monitoring of IGBT heating power in train traction converters. At the same time, the existing monitoring methods cannot achieve the purpose of limiting the maximum junction temperature of IGBT while monitoring IGBT heating power.

Method used

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  • Device and method for limiting junction temperature and reducing loss of traction converter switching device
  • Device and method for limiting junction temperature and reducing loss of traction converter switching device
  • Device and method for limiting junction temperature and reducing loss of traction converter switching device

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0043] like figure 1 As shown, the core of the device for limiting the junction temperature and reducing loss of the switching device of the train traction converter of the present invention lies in the monitoring of IGBT power consumption based on DSP and CPLD. The basic structure of the device is as figure 1 As shown in , the traction control unit of the traction converter is connected to the six IO pins of the CPLD, and the other six IO pins of the CPLD are respectively connected to the signal input channels of the six IGBT drive units;

[0044] The traction control unit of the traction converter outputs 6 SVPWM input signals, and transmits the 6 SVPWM input signals to the CPLD. The CPLD controls the frequency of the 6 SVPWM input signals, and then outputs 6 SVPWM output signals, and the 6 SVPWM output signals are transmitted to six IGBTs.

[0045]The f...

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Abstract

The invention relates to a device and a method for limiting the junction temperature and reducing loss of a traction converter switching device. The device comprises a power module, a DSP and a CPLD.The method comprises the following steps: S1, the DSP collects a three-phase output current signal and a radiator temperature signal, and the CPLD calculates the switching frequency of an IGBT; S2, the DSP calculates the collector current in the conduction process of the IGBT according to the three-phase output current signal, and calculates the on-state loss and switching loss according to the collector current; S3, the DSP calculates the heating power of the IGBT according to the on-state loss and the switching loss; S4, the calculated heating power is imported into a thermal resistance model so as to obtain real-time junction temperature data of the IGBT; and S5, if the junction temperature data is higher than a set threshold, the switching frequency of the IGBT is controlled through the CPLD, and thus, the switching frequency of the IGBT is reduced. Therefore, loss is reduced, and the maximum junction temperature of the IGBT is limited.

Description

technical field [0001] The invention relates to the field of railway trains, in particular to a device and method for limiting junction temperature and reducing losses of switching devices of train traction converters. Background technique [0002] Railway transportation plays an indispensable role in the development process of our country. Promoting the development of my country's railways in the direction of informatization and intelligence has become an important development factor for the current railway construction. As an important part of the train transmission system, the traction converter of the train has a high proportion of faults due to its core component, the IGBT, which is relatively delicate and fragile. The IGBT failure is closely related to its excessive heating power and high junction temperature. Most of the IGBT failures are caused by the excessive heating power and high junction temperature of the IGBT. Therefore, it is necessary to monitor the heating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M1/08H02M1/084H02M1/088
CPCH02M1/08H02M1/0845H02M1/088H02M1/32H02M1/0012H02M1/0048H02M1/0054H02M1/327Y02B70/10
Inventor 王艳琴金静飞李明王磊张钢曹会阳李含聪
Owner CRRC TANGSHAN CO LTD
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