Current-sharing circuit for high-power parallel IGBT modules

Abstract

The invention discloses a current-sharing circuit for high-power parallel IGBT modules. The circuit comprises a controller and a plurality of current-sharing control branches connected in parallel, wherein each current-sharing control branch comprises a first current detection circuit, a second current detection circuit, a first drive circuit, a second drive circuit and a transformer T; the firstcurrent detection circuits and the second current detection circuits are used for detecting output current of the first IGB module and the second IGBT module separately to obtain two paths of detection current transmitted to the controller; the controller generates two paths of control signals according to the magnitudes of the two paths of detection current; the two paths of control signals are driven through the first drive circuits and the second drive circuits separately and then transmitted to the transformers T; and the transformers T synchronously output the two paths of control signalsto grids of the first IGBT module and the second IGBT module. According to the current-sharing circuit, the problem of imbalance of static current-sharing in a conducting state and dynamic current-sharing in a switching state is solved while the cost of a control driver is not greatly increased.

Description

technical field [0001] The invention relates to a current equalizing circuit for high-power parallel IGBT modules, which realizes greater power without greatly increasing the cost of the control driver, and can be applied to high-power, high-current and high-load environments. It belongs to the technical field of high-power and high-efficiency power conversion. Background technique [0002] With the maturity and development of IGBT technology, and the continuous enhancement of IGBT's withstand voltage and flow capacity, IGBT has become the first choice for high-power fully-controlled devices. However, in high-power applications, the capacity of a single IGBT still cannot meet the requirements. In order to Improving the power level of power electronic devices requires the parallel connection of multiple IGBTs to increase capacity. [0003] While the parallel use of IGBT modules improves its ability to withstand current, it also faces some new problems: due to the influence o...

AI Technical Summary

Problems solved by technology

[0009] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a current equalizing circuit for high-power parallel IGBT modules, to effectively solve the problem of static equalization in the conduction state without greatly increasing the cost of the control driver. Current and dynamic current sharing unbalance problem in switch state, generate higher power current signal

Images