Integrated charging system considering charging voltage ripple suppression and temperature control method

Abstract

The invention discloses an integrated charging system considering charging voltage ripple suppression and a temperature control method. The system comprises an uncontrolled rectifier bridge connected to a single-phase alternating current power supply. The positive electrode of the uncontrolled rectifier bridge is connected with the neutral point of the A-phase winding of the three-phase permanent magnet synchronous motor through the first mode change-over switch. A neutral point of a B-phase winding and a neutral point of a C-phase winding of the three-phase permanent magnet synchronous motor are connected with a neutral point of an A-phase winding through a second mode switching switch. The wiring end of the three-phase permanent magnet synchronous motor winding is connected with the output end of the three-phase inverter; and the power battery is connected in parallel with the input end of the three-phase inverter. And the second mode change-over switch is used for reconstructing the B-phase winding, the C-phase winding and the two groups of half-bridges of the three-phase inverter into an active filter and suppressing the voltage pulsation of the output side so as to convert the alternating current output by the single-phase alternating current power supply into the direct current to charge the power battery. The temperature of the power battery in the charging process can be detected, and the charging efficiency is improved.

Description

technical field [0001] The invention relates to the field of power electronics technology, in particular to an integrated charging system and temperature control method that take into account the suppression of charging voltage fluctuations. Background technique [0002] Today, the development of new energy electric vehicles has been actively supported by governments of various countries, and has achieved rapid development worldwide. In recent years, the number of automobiles in my country has continued to increase, so it is imperative to develop pure electric vehicles and plug-in hybrid electric vehicles. The full participation of government agencies, vehicle manufacturers and energy companies in new energy electric vehicles has provided a driving force for the development of the electric vehicle industry. [0003] The charging efficiency of electric vehicle charging equipment can be used as an important indicator to evaluate the charging service network. In order to ensu...

AI Technical Summary

Problems solved by technology

Secondly, during the charging process, the optimal operating temperature of the power battery is 25°C. When the power battery is started at low temperature and charged at low temperature, the charging current is limited because the battery management system detects that the internal temperature of the power battery is low. Charging under the limit of a few amperes or even a few amperes will seriously affect the charging efficiency

[0004] The actual working condition of the power battery is high-current discharge and charging, which will generate a lot of heat during the working process. If left unattended, it will seriously affect the performance of the power battery, and even cause the power battery to spontaneously ignite

However, the driving motor, motor controller, and DC-DC converter are all operating under high current conditions, which easily generate heat. At the same time, because the system is in a closed space, it is easy to cause heat accumulation and increase the temperature. The high temperature of the equipment will reduce the power of the motor. , or even the motor windings and the IGBT inside the DC-DC converter burn out, causing the vehicle to be unable to use normally. Therefore, the temperature control of the battery during charging and the ability to convert AC power into DC power are two keys to solving the charging efficiency of electric vehicles. factor

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