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

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...

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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-current switching environment, the conduction voltage drop value tested is very small, which is very susceptible to interference.

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