High power density charging module and method based on all-digital control

Abstract

The invention discloses a high power density charging module and method based on all-digital control. A three-phase Wiener PFC circuit is subjected to double-loop control of a voltage outer loop and an AC current inner loop of a DC bus. A three-level LLC DC converter is subjected to pi control operation of the voltage and current loops. Meanwhile, the operational results of the voltage and current loops are compared in real time to determine the larger value, and the control mode thereof is used for driving the three-level LLC DC converter so that the charging module is in a constant voltage or constant current charging state. According to the invention, the miniaturized high power density of the charging module is realized by optimizing main circuit topological parameters, using control strategies and the like under the premise that the output power level is unchanged, the size of the single machine charging module is reduced, the size of the whole charging system device is thus reduced, the hardware cost and the manpower for engineering debugging are reduced, and the light weight and easy maintenance are realized.

Description

technical field [0001] The invention relates to a high power density charging module and method based on full digital control. Background technique [0002] With the promotion of electric vehicles, the application environment and occasions of the charging module have also expanded. The digital control of the charging module can achieve high-precision control and facilitate debugging and modify the control strategy to adapt to different applications. The control method is more flexible, eliminating the need for disassembly. The case has the hassle of modifying the hardware inside the module. In order to achieve high power density output, the charging module adopts a two-stage series structure. The front stage realizes the active power factor correction function, and the latter stage realizes constant voltage or constant current or constant power output. Both the pre-stage and post-stage master control adopt DSP digital control. Using digital control, the control algorithm i...

AI Technical Summary

Problems solved by technology

Using digital control, the control algorithm inside the DSP can be changed conveniently and flexibly through can communication technology, which greatly saves debugging time and labor costs. If hardware control is used, the machine needs to be turned on during the debugging process and field application process. Shell to change hardware, which is too troublesome and not easy to maintain

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