Hybrid-electric pure electric vehicle energy distributor and control method thereof

Abstract

The invention relates to a hybrid-electric pure electric vehicle energy distributor and a control method thereof and relates to the field of electric vehicles. The hybrid-electric pure electric vehicle energy distributor comprises at least two pairs of IGBTs (insulated gate bipolar transistors), an IGBT drive board and a control unit. A first IGBT collector and a second IGBT emitter in each pair of IGBTs are connected to form a power source connecting end. A first IGBT emitter in each pair of IGBTs is connected with an anode of a diode. A second IGBT collector in each pair of IGBTs is connected with a cathode of another diode. The other electrodes of the two diodes are connected to form a high-voltage load connecting end. A gate of every IGBT is connected with the IGBT drive board. The IGBT drive board is connected with the control unit. The control unit controls on and off of all IGBTs through the IGBT drive board so as to allow forward or reverse flow of current between each power source and a high-voltage load. The power sources are capable of powering and recycling energy simultaneously or mutually independently, so that the problem of mutual charge and discharge of the power sources is avoided, charge efficiency is maximized, energy utilization rate is increased, and cycle lives of the power sources are prolonged.

Description

Technical field [0001] The invention relates to the field of electric vehicles, and more specifically to an energy distributor and control method mainly applied to electric-electric hybrid pure electric vehicles. Background technique [0002] In recent years, fuel demand has continued to rise sharply, and air pollution has become increasingly serious. In particular, the continuous increase in CO2 produced by automobile emissions has caused abnormal changes in the global climate. Energy depletion and environmental pollution have become problems that need to be solved urgently in today's society. Electric vehicles, especially pure electric vehicles, are the most direct and effective way to alleviate this problem. Although electric vehicles have obvious advantages in environmental protection, energy saving, and cleanliness, they also have many shortcomings. In a sense, the success or failure of electric vehicles depends first on battery technology. [0003] In order to meet the compl...

AI Technical Summary

Problems solved by technology

[0005] Most of the existing composite power supply systems for electric-electric hybrid pure electric vehicles directly connect multiple power supplies to high-voltage loads in parallel, which cannot avoid the problem of mutual charging and discharging between multiple power supplies. The power supplies are frequently charged and discharged to each other, which reduces the cycle life of all the power supplies; the mechanical contactor is used to switch the power supply. On the one hand, the mechanical contactor takes a long time to switch, and on the other hand, it is prone to coil burnout, Faults such as contact bonding and mechanical jamming seriously affect driving safety. Moreover, if a mechanical contactor is used to realize simultaneous energy supply of multiple power supplies, that is, the mechanical contactors controlling each power supply are in the engaged state, and multiple power supplies When the power supply is connected to the high-voltage load in parallel, the problem of mutual charging and discharging between multiple power supplies cannot be avoided

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