Power diode module working junction temperature on-line detection system and detection method

A technology for power diodes and working junction temperature, applied in diode testing, measuring electricity, measuring devices, etc., which can solve the problems of small conduction voltage drop, high bus voltage of voltage sensor, and easy interference.

Inactive Publication Date: 2016-05-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the voltage sensor used in this way needs to withstand high bus voltage in the diode blocking state
Secondly, in the high-volt

Method used

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  • Power diode module working junction temperature on-line detection system and detection method
  • Power diode module working junction temperature on-line detection system and detection method
  • Power diode module working junction temperature on-line detection system and detection method

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Embodiment Construction

[0038] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] figure 1 A schematic diagram of the test platform for the operating junction temperature of a power diode module with a two-level half-bridge topology with an inductive load is shown. The entire test platform mainly includes high-power diode module D, high-power IGBT module, drive unit, DC power supply V, DC energy storage capacitor C, freewheeling reactor L, temperature control unit, sampling unit and junction temperature detection unit, of which: diode The cathode terminal of the module D is connected to the positive pole of the DC energy storage capacitor C and the positive pole of the DC power supply V; one end of the freewheeling reactor L is connected to the input terminal of the high-power IGBT module, and the other end is connected to the p...

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Abstract

The invention discloses a power diode module working junction temperature on-line detection system and detection method. By controlling the connection and disconnection of an active switch device, a power diode module is allowed to be switched between an on state and an off state; and when the power diode module is switched from the on state to the off state, the current passing through the power diode module commutates to a complementary switch tube, and the reverse recovery current of the power diode module generates corresponding induced voltage in a stray inductor of a commutation loop, wherein the induced voltage is related to the reverse recovery current of the power diode module and meanwhile, comprises temperature information of the power diode module. The change information of the reverse recovery current comprising the temperature information can be measured in the complementary switch tube by utilizing a low-voltage amplitude detection circuit without extra high-voltage passive auxiliary components; while a drive circuit sends a control signal, change voltage caused by the reverse recovery current is captured; and the detection method and system have higher precision and real-time performance.

Description

technical field [0001] The invention belongs to the technical field of detection of power electronic devices, and in particular relates to an online detection system and a detection method for the working junction temperature of a power diode module. Background technique [0002] In actual converter application conditions, the power module not only needs to withstand the self-heating junction temperature change of the internal chip due to the turn-on and turn-off, but also experiences the dual effects of external environmental temperature changes such as seasons and day and night. influences. According to a large number of test data and failure mechanism analysis, academia and industry have found that the number of temperature cycles experienced by a module before failure is determined by the junction temperature swing, the highest junction temperature, the average junction temperature, the lowest case temperature and the module cycle. Time and other factors are jointly det...

Claims

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Application Information

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IPC IPC(8): G01R31/26G01R31/27
CPCG01R31/2632G01R31/27
Inventor 李武华罗皓泽王祥陈玉香常垚何湘宁
Owner ZHEJIANG UNIV
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