On-line detection system and method for work junction temperature of power diode module

A technology of power diodes and working junction temperature, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, etc., and can solve problems such as susceptibility to interference, small conduction voltage drop, and high withstand voltage requirements of voltage sensors.

Active Publication Date: 2014-10-08
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the voltage sensor used in this method needs a high withstand voltage requirement. Secondly, in the high-voltage and high

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  • On-line detection system and method for work junction temperature of power diode module
  • On-line detection system and method for work junction temperature of power diode module
  • On-line detection system and method for work junction temperature of power diode module

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Embodiment Construction

[0037] 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.

[0038] 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 an on-line detection system and method for the work junction temperature of a power diode module. According to the on-line detection system and method, on-off of an active switch device is controlled to enable the power diode module to be switched in the turn-on state and the turn-off state. When the power diode module is switched to be turned off from being turned on, currents flowing through the power diode module are converted to a complementary switch tube, the reverse recovery currents of the power diode module can generate corresponding induced voltages on a stray inductor of a conversion circuit, and the induced voltages are related to the reverse recovery currents of the power diode module and also comprise the temperature information of the power diode module. According to the on-line detection system and method for the work junction temperature of the power diode module, the variation condition of the reverse recovery currents comprising the temperature information can be measured on the complementary switch tube only by one low-voltage amplitude detection circuit, and additional high-voltage passive auxiliary elements are of no need. While a driving circuit sends control signals, variation voltages caused by the reverse recovery currents are captured, and high precision and real-time performance are achieved.

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 detection method for the working junction temperature of a power diode module. Background technique [0002] The junction temperature of power devices in operating conditions is the most important parameter in power electronics. As the operating junction temperature of power devices varies, important electrical parameters such as power device losses, operating trajectories, peak voltages, and peak currents will vary accordingly. The maximum operating junction temperature limit of power devices not only affects the extreme operating conditions of power electronic devices, but also affects the design margin and design criteria of heat sinks. Therefore, obtaining the junction temperature variation of power electronic devices under operating conditions can ensure that the power electronic devices operate in a s...

Claims

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Application Information

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IPC IPC(8): G01R31/27G06F19/00
Inventor 李武华罗皓泽何湘宁
Owner ZHEJIANG UNIV
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