Passive series composite power source braking energy recovery system

Abstract

The invention discloses a passive series composite power source braking energy recovery system. The passive series composite power source braking energy recovery system comprises a storage battery, a motor, a motor controller, a rectifier bridge, a supercapacitor, diodes, a switch and a controller. During regenerative braking, a three-phase counter electromotive force only charges the supercapacitor through the rectifier bridge, and the storage battery dose not participate in energy recovery; in the driving process, the storage battery is in series connection with the supercapacitor to output electric energy; through the diodes in parallel, the battery is prevented from conducting reverse charging on the supercapacitor; the system can be switched to be in storage battery single driving mode, and thus energy consumption of an output current on the diodes during long-time outputting is avoided; the controller controls switching of the switch, the strict requirements during switching are avoided, that is, zero-current switching can be conducted in a non-driving state; and the controller continuously detects the voltage at the supercapacitor end, the voltage of the storage battery, and the braking vehicle speed, and sends a PWM signal to control on-off of a thyristor in the rectifier bridge, direct current chopping of a braking current is achieved, and the electric braking deceleration is controlled. The passive series composite power source braking energy recovery system utilizes the rectifier bridge to recover braking energy, and the energy utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a passive series composite power supply braking energy recovery system. Background technique [0002] At present, the problems of environmental pollution and energy shortage have promoted the rapid development of electric vehicles. However, problems such as insufficient driving range and short service life of batteries are still roadblocks to the development of electric vehicles. The regenerative braking system can convert the kinetic energy of the vehicle into electrical energy and store it, effectively increasing the driving range of electric vehicles. [0003] Recycling the braking energy directly to the battery will cause the battery to be impacted by a large current, which will seriously affect the life of the battery. The super capacitor has the characteristics of high power density, fast charging and discharging, etc., so combining it with the power b...

AI Technical Summary

Problems solved by technology

[0004] The existing composite power supply structure is mainly based on active parallel connection, which has a series of problems such as large volume, low recovery efficiency, and complicated control.

There are also problems in circuit protection and braking current control in the series composite power supply that need to be solved

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