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Non-isolated bidirectional direct-current converter with high voltage conversion ratio

A bidirectional DC conversion and high voltage technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, output power conversion devices, etc., can solve the problem of high switching voltage stress, low voltage conversion ratio, and low switching voltage Stress and other issues, to achieve the effect of low switching voltage stress, reduce loss, wide range voltage conversion ratio

Inactive Publication Date: 2021-06-15
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the shortcomings of the above-mentioned bidirectional DC converter in the prior art and solve the problems of low voltage conversion ratio and high switch voltage stress, the purpose of the present invention is to provide a non-isolated bidirectional DC converter with high voltage conversion ratio, which can realize high Voltage Gain and Low Switching Voltage Stress

Method used

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  • Non-isolated bidirectional direct-current converter with high voltage conversion ratio
  • Non-isolated bidirectional direct-current converter with high voltage conversion ratio
  • Non-isolated bidirectional direct-current converter with high voltage conversion ratio

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Embodiment Construction

[0029] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0030] The present invention is a non-isolated bidirectional DC converter with high voltage conversion ratio, mainly composed of 4 power switches, 2 capacitors and 1 inductance. The power switch, and the other two power switches act as synchronous rectifiers.

[0031] For details, please refer to figure 1 As shown, the four power switches are S 1 -S 5 , 2 capacitors are polar capacitors C 1 -C 2 , an inductance of L 1 . where the polar capacitance C 1 The negative pole and the power switch S 3 One end of the low voltage terminal V L The negative terminal and the high voltage terminal V H The negative, polarized capacitor C 1 The positive pole of the power switch S 1 One end of the power switch S 2 One end of the power switch S 2 The other end of the power switch S 4 One end and polarity capacitor C 2 positive pole of the power swit...

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Abstract

A non-isolated bidirectional direct-current converter with a high voltage conversion ratio is mainly composed of four power switches S1 to S4, two polar capacitors C1 to C2 and an inductor L1, the negative electrode of C1 and one end of the S3 are connected with the negative electrode of a low-voltage end VL and the negative electrode of a high-voltage end VH, the positive electrode of the C1 is connected with one end of the S1 and one end of the S2, the other end of the S2 is connected with one end of the S4 and the positive electrode of the C2, the other end of the S1 and the negative electrode of the C2 are connected with one end of the L1 and the other end of the S3, the other end of the L1 is connected with the positive electrode of the low-voltage end VL, the other end of the S4 is connected with the positive electrode of the high-voltage end VH, in the boost / buck state, the S2 and the S3 serve as a power switch / synchronous rectifier, and the S1 and the S4 serve as a synchronous rectifier / power switch. The problems of low voltage conversion ratio, high switching voltage stress and the like are solved, high voltage gain and low switching voltage stress are realized, and the buck-boost unit is particularly suitable for a direct-current power grid.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, can be applied to fields such as DC microgrids, and particularly relates to a non-isolated bidirectional DC converter with a high voltage conversion ratio. Background technique [0002] Smart grid is the main trend of power grid development. With the increase of voltage level, the disadvantages of AC transmission become more and more obvious, and the energy loss is getting bigger and bigger. DC transmission has the characteristics of low energy loss in long-distance transmission, and the DC power grid will become the main component of the smart grid era. The DC microgrid can more efficiently and reliably receive distributed renewable energy generation systems such as wind and light, energy storage units, electric vehicles and other DC loads. In the DC power grid, the essential module is the bidirectional DC-DC module. This is because the power grid needs to change the voltage level ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 刘晔何沐函刘昊顾栋豪
Owner XI AN JIAOTONG UNIV
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