Vehicle-mounted converter circuit and control method thereof

Abstract

The invention relates to a converter circuit, and specifically relates to a vehicle-mounted converter circuit and a control method thereof. In view of the shortcomings of the prior art, the inventionprovides a vehicle-mounted converter circuit and a control method thereof. The vehicle-mounted converter circuit has a function of bidirectional energy flow and is simple to control, and main high-frequency switching devices can realize soft switching and have an external charging function. According to the invention, the converter has a charger function through on-off switching. In a vehicle running mode, bidirectional energy transmission between an energy storage equipment side and a traction side power supply can be achieved, energy generated during motor braking can be utilized to the maximum extent, and the endurance mileage of an energy storage vehicle is increased. In the vehicle running mode, no matter in which direction the energy is transmitted, all high-frequency switching devices can realize soft switching in a full-load range, and the conversion efficiency is high.

Description

technical field [0001] The invention relates to a converter circuit, in particular to a vehicle converter circuit and a control method thereof. Background technique [0002] Today, as fossil fuels are increasingly scarce, new energy vehicles have received widespread attention and applications; however, due to the constraints of energy storage equipment (battery or super capacitor) materials, the cruising range has been greatly limited; in the rail transit industry, energy storage Type guideway trams are also plagued by this problem. In the application of energy storage guide rail cars, under normal circumstances, it is charged at a fixed station (station) through a vehicle-mounted or ground charger, and then drives out after the (battery or supercapacitor) is fully charged; general energy storage equipment (battery, supercapacitor) Capacitor) side voltage is low, while the inverter (traction) side requires a higher voltage, so when the energy storage device supplies power, ...

AI Technical Summary

Problems solved by technology

[0007] 1. DC / DC can only achieve one-way flow of energy, and cannot effectively utilize the energy generated by the traction motor under braking conditions

[0008] 2. The electrical isolation between traction and power supply (battery) is not realized. After a problem occurs in the subsequent stage, the problem is easy to expand

[0009] 3. The switching device of the DC / DC converter works in a hard switching state, which is not conducive to the improvement of the power density of the converter and EMC

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