Vehicle high-power DC/DC driving power supply and driving method

Abstract

The invention provides a vehicle high-power DC / DC driving power supply and a driving method. A synchronization signal processing unit of a car main battery supplies electricity to a PWM controller by a relay isolation control power supply. Power switch components drive isolation transformer components and current are outputted to the main battery through a rectifier filter. Signals of an output current sensor and an output voltage sensor, after an output feedback processing, are sent into the PWM controller. An input current sensor obtains peak current of the isolation transformer components, and when the peak current exceeds a set value, the PWM controller is automatically shut-off and restarted. The driving power output is shut down after over temperature treatment. Data are sent through voltage lines of inputting and outputting current to be analyzed, V, and if the data exceed a set value, the drive power supply output is shut down or the drive power supply output is reduced. A BMS samples secondary batteries, and when a single-cell battery is lower than the set value, the output is shut down. The drive power supply provided by the invention is specially designed for a secondary car drive. A relatively lower input voltage is converted into a high voltage required for a car, the number of secondary batteries used in series is significantly reduced, such that the battery is liable to standardization.

Description

technical field [0001] The invention relates to a driving power supply and a driving method for a vehicle, in particular to a high-power DC / DC driving power supply and a driving method for a vehicle. Background technique [0002] With the increasingly prominent problems of energy and environmental protection, hybrid vehicles and pure electric vehicles have been identified as clean and green vehicles and have developed rapidly. However, the storage battery that provides energy at the present stage has obvious defects: its output characteristics are soft and its dynamic performance is poor, that is, its voltage changes correspondingly with the output power. In addition, the required voltages of various types of vehicles are also inconsistent. In order to standardize the battery, a DC / DC drive power supply is required for voltage matching and conversion. Due to the high power of this kind of power supply, the reliability and safety of the circuit architecture selection need to...

AI Technical Summary

Problems solved by technology

However, the batteries that provide energy at the present stage have obvious defects: the output characteristics are soft and the dynamic performance is poor, that is, the voltage changes correspondingly with the change of the output power

[0006] The current high-power DC / DC power supply for vehicles, by stepping down or boosting the secondary energy storage battery, makes the output characteristics not change with the load or changes slightly with the load, which solves the problem of soft output characteristics and dynamics of the battery. poor performance problem

However, its control strategy and protection are still very simple, and it cannot effectively protect the secondary battery, the main battery and the driving power itself, and cannot fully meet the requirements of the driving power for vehicles.

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