Dual phase shift modulation method of isolated bidirectional full-bridge DC-DC converter

A DC-DC, double phase-shifting technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve the problem of large impact current, small phase shift angle adjustment range, large return power and peak current and other problems, to achieve the effects of small current impact, wide phase shift adjustment range, and improved flexibility

Active Publication Date: 2020-01-21
HEBEI UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this traditional dual phase-shift modulation method will still have large return power and peak current under non-heavy-load power transmission; and

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  • Dual phase shift modulation method of isolated bidirectional full-bridge DC-DC converter
  • Dual phase shift modulation method of isolated bidirectional full-bridge DC-DC converter
  • Dual phase shift modulation method of isolated bidirectional full-bridge DC-DC converter

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] like figure 1 As shown, the topology of the isolated bidirectional full-bridge DC-DC converter involved in the present invention includes a high-frequency isolation transformer with a transformation ratio of n, an inductance L, dual active full-bridge input side full-bridge H1 at both ends of the transformer, and a right-side full-bridge H2 , input side power supply V 1 and output side supply V 2 And the filter capacitor C on both sides of the power supply 1 and C 2 ;Transformer primary side voltage V ab and transformer secondary side voltage V cd, respectively represent the output voltages of the left full bridge and right full bridge relative to the transformer, and the switching tube S involved in the topology 1 ~S 8 Anti-parallel ...

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Abstract

The invention discloses a dual phase shift modulation method of an isolated bidirectional full-bridge DC-DC converter. An inner and outer phase shift angle relationship of the isolated bidirectional full-bridge DC-DC converter is re-restrained, a phase shift angle D1-1 in a left side switching tube is equal to an inter-bridge phase shift angle D2 and is served as a modulation degree of freedom, and a phase shift angle D1-2 in a right side switching tube is served as another modulation degree of freedom for modulation. The modulation method is suitable for non-heavy-load power transmission withpower per unit transmission power which is smaller than 0.667. Compared with a traditional dual phase shift modulation method, by using the modulation method of the invention, backflow power is basically eliminated, converter efficiency of the isolated bidirectional full-bridge DC-DC converter under a non-heavy-load condition is increased, and a phase shift angle adjustment range is widened.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a dual phase-shift modulation method for an isolated bidirectional full-bridge DC-DC converter. Background technique [0002] An isolated bidirectional full-bridge DC-DC converter (Isolated Bidirectional DC-DC Converter, IBDC) is a dual active bridge (Dual Active Bridge, DAB) converter. It has the advantages of bidirectional energy flow, high power density, electrical fault separation, high voltage transmission ratio, easy soft switching, and simple structure, and is widely used in new energy technology fields such as distributed microgrids and electric vehicles. Compared with the dual half-bridge topology, the dual full-bridge in the dual active bridge topology has the above advantages, and also has the characteristics of high degree of control freedom and flexible modulation. Therefore, the isolated dual full-bridge topology has wider application value. [0003] The ...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/088
CPCH02M3/33523H02M3/33584H02M1/088
Inventor 李珊瑚李雪刘鹏迟颂刘旭
Owner HEBEI UNIV OF TECH
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