A vehicle power supply and its control method

Abstract

The invention discloses a vehicle-mounted power supply with a wide input and output voltage range, which belongs to the technical field of power electronic converters. The output of the phase-shifting full-bridge circuit is used as the input of the subsequent phase-shifting full-bridge circuit, and the output of the phase-shifting full-bridge circuit is connected with the load. Optimum working point, so as to ensure the best efficiency of the whole machine. At the same time, the present invention integrates the Boost inductor and the phase-shifting full-bridge filter inductor, and the phase-shifting full-bridge transformer, so as to reduce the volume, weight and loss of the power magnetic parts, and improve the Power Density and Efficiency of Automotive Power Supplies. The invention provides an effective solution for the vehicle power supply with high voltage input, low voltage and high current output, and wide input and output voltage ranges.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters and DC-DC electric energy conversion, and in particular relates to a vehicle-mounted power supply with a wide input and output voltage range and a control method thereof. Background technique [0002] With the development of science and technology, the progress of society and the continuous enhancement of people's awareness of environmental protection, automobiles, which once brought great convenience to human life, have become one of the main pollution sources of urban air and are attracting more and more attention. Electric vehicles use electric energy as the main energy source. Compared with traditional fuel vehicles, they have the advantages of reducing environmental pollution and improving energy utilization, so they have gained more and more favor. [0003] Faced with applications such as wide input and output voltage ranges, although traditional multi-stage DC-DC convert...

AI Technical Summary

Problems solved by technology

[0003] Faced with applications such as wide input and output voltage ranges, although traditional multi-stage DC-DC converters can meet the continuous regulation of wide voltage ranges, there are still some shortcomings: First, in order to match the wide range of input and output voltages, all stages The converter needs to have a certain voltage gain. At the non-voltage matching point, the overall efficiency of the converter is low. The design of this type of converter is usually difficult and it is difficult to optimize the efficiency in the entire gain range; secondly, the wide The application occasions of input and output make the power devices in the traditional solution have a large stress, difficult selection, high loss and other problems; in addition, due to the physical size of magnetic components such as transformers and inductors, the traditional multi-stage DC-DC conversion The transformer has the problems of large volume and low power density, and is not suitable for applications that require high volume such as electric vehicles; finally, the traditional transformer and inductor solutions not only have high requirements for the thermal design of the converter, but also have high requirements for the thermal design of the converter. The power conversion efficiency of the converter has a certain influence

For example, the document "Y. yuan, X. Mei and Z. Zhang, "A Combined DC-DC Converter Suitable for Wide Output Voltage Range," 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC), Shenzhen, 2018, pp. 1-6." Using a combined structure to cascade two DC-DC converters with a three-level structure to supply power to the load, this structure has certain innovations, but the input and output voltage adjustment gain range is limited under this structure, And there are two independent transformers, the converter has a large volume and low power density, so it is not suitable for vehicle applications with high volume requirements

[0005] Literature "Y. Zhang, Y. Gao, L. Zhou and M. Sumner, "A Switched-CapacitorBidirectional DC–DC Converter With Wide Voltage Gain Range for Electric Vehicles With Hybrid Energy Sources," in IEEE Transactions on PowerElectronics, vol. 33, no. 11, pp. 9459-9469, Nov. 2018."Using switched capacitor circuits to realize wide regulation of input and output voltages has the advantages of simple structure, small size and high power density, but there is no gap between input and output in this scheme Electrical isolation, as a vehicle power supply, there are certain safety hazards

[0006] Literature "D. Liu, Y. Wang, F. Deng, Q. Zhang and Z. Chen, "Zero-VoltageSwitching Full-Bridge T-Type DC / DC Converter with Wide Input Voltage Range and Balanced Switch Currents," in IEEE Transactions on Power Electronics, vol. 33, no. 12, pp. 10449-10466, Dec. 2018."A full-bridge T-shaped circuit structure is used, and a new type of SiC device is used to achieve high-efficiency power conversion of the converter, but this solution exists High cost, large volume of magnetic core components, limited power density and other problems, the application is relatively limited

[0007] It can be seen that although the above solutions change the circuit structure and use new semiconductor devices to achieve wide adjustment of input and output voltages, or high-efficiency power conversion, the consideration of the volume and power density of the converter is not sufficient. Considering the above The solution has certain deficiencies

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