Testing circuit and testing method for temperature rise of IGBT module of frequency converter

Abstract

The invention discloses a testing circuit and testing method for a temperature rise of an IGBT module of a frequency converter. With the circuit and method, problems that the testing time is long, the loss power is high, and testing is limited by equipment during temperature rise testing on the IGBT module of the frequency converter can be solved. A controller exerts a PWM pulse signal on a measured module and modulation factors and phase angles of each group of IGBT modules are changed, so that the control way is simple. Circulation of active units and passive units in a closed loop formed by a first group of measured IGBT modules, a second group of measured IGBT modules, and a load reactor can be realized, thereby realizing circulated flowing of the energy between the two groups of IGBT modules and the load reactor; and the power grid only provides the loss power part, thereby substantially reducing the testing cost. Moreover, a PLC monitors information of currents, voltages, temperatures and faults of the measured IGBT modules in real time. Only a direct-current bus needs to be connected externally and the controller and the load reactor can employ internal devices of the frequency converter, so that the testing requirements can be met easily; the occupied area is small; and the time for construction of the testing platform is short.

Description

technical field [0001] The invention relates to a test circuit for temperature rise of a frequency converter module, in particular to a temperature rise test circuit for a frequency converter IGBT module, which is mainly suitable for the power test of frequency converter IGBT devices, and is used to investigate the temperature of devices such as IGBTs and reactors. Lift. Background technique [0002] The main heating part of the inverter is in the power device part. For the rectification and inverter part of the four-quadrant inverter and the inverter part of the two-quadrant inverter, the current mainstream inverters use IGBT modules. IGBT is a voltage-type control device with input It has the advantages of high impedance, small switching loss, fast on-off speed, high operating frequency, and large power capacity. Generally, the current flowing through the IGBT is relatively large, the switching frequency is high, and its loss is relatively large. If the heat dissipation s...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a frequency converter IGBT module temperature rise test circuit and a test method thereof, which solves the problems of long test time, large power loss and equipment limitation in the temperature rise test of the frequency converter IGBT module

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