Three-phase PFC rectifier device and control method for electric vehicle high-power DC charger/pile

Abstract

The invention relates to a high-power DC charger / pile three-phase PFC rectifier for electric vehicles and a control method, which adopts a three-phase three-bridge topological structure, has a power factor correction function, and has controllable output voltage levels and small steady-state errors. The output of this device has constant voltage control mode and constant current control mode, and has voltage, current, temperature protection and IGBT drive circuit with power-on protection. A pre-start / anti-backfeed module is added to the DC output side, which effectively improves the device's performance. safety and reliability. The device adopts the closed-loop control of the grid voltage orientation and the control method of the three-phase digital phase-locked loop, and uses the SVPWM modulation method to improve the utilization rate of the DC side voltage, reduce the harmonic content of the grid side current, and have a fast response speed and start-up. The current is small. The device has the characteristics of high power factor on the grid side, high working efficiency of the whole machine, less harmonics on the grid side, fast response speed, small starting current, safety and reliability, etc. It can be used not only for high-power DC chargers / piles for electric vehicles, but also for Other high-power power supply occasions.

Description

technical field [0001] The invention belongs to a three-phase PFC rectification device and a control method of a high-power DC charger / pile for an electric vehicle, and specifically relates to a method for charging an electric vehicle battery, which has a high power factor, is clean and environmentally friendly, and is safe and reliable. High performance controllable constant voltage or constant current output device and control method. Background technique [0002] With the continuous reduction of non-renewable energy sources, promoting the rapid development of new energy sources has become a top priority. In the automotive industry, electric vehicles have emerged as the times require. As a green vehicle with broad development prospects, their popularity will be extremely rapid in the future. The future market prospect is also extremely huge. As an important supporting facility for electric vehicles, electric vehicle chargers / piles are increasingly valued by society and th...

AI Technical Summary

Problems solved by technology

A device that uses multiple small modules connected in parallel usually takes up a lot of space, and it is difficult to apply on-board chargers / piles, while on non-vehicle chargers / piles, it often needs to occupy an independent charging room, which is difficult in crowded cities. The high cost of implementation limits the scope of use of off-board chargers / piles

[0006] 2) Low conversion efficiency

The parallel connection of multiple low-power modules causes heat loss for multiple switching devices, which reduces the efficiency of the whole machine. At the same time, other cooling measures need to be added to further reduce the efficiency of the charger / pile

[0007] 3) High equipment cost and high failure rate

Multiple modules need to multiply the cost of equipment and the cost of supporting cooling equipment, and any failure of any module may cause other modules and the entire charger / pile to lose its working ability

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