A dual phase-shift modulation method for an 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, adjusting electrical variables, etc., can solve the problem of large return power and peak current, small phase shift angle adjustment range, and large impact current and other problems, to achieve the effects of small current impact, wide phase shift adjustment range, and elimination of backflow power

Active Publication Date: 2022-02-08
HEBEI UNIV OF TECH
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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 it has a small adjustment range of phase-shift angle under constant power transmission, so the change of phase-shift angle will produce Large inrush current

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  • A dual phase-shift modulation method for an isolated bidirectional full-bridge dc-dc converter
  • A dual phase-shift modulation method for an isolated bidirectional full-bridge dc-dc converter
  • A dual phase-shift modulation method for an 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] Such as 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-parall...

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Abstract

A dual phase-shift modulation method of an isolated bidirectional full-bridge DC-DC converter of the present invention re-constrains the relationship between the internal and external phase shift angles of the isolated bidirectional full-bridge DC-DC converter, and the internal phase shift angle D of the left switch tube 1‑1 Phase shift angle D with the bridge 2 equal and as a modulation degree of freedom, shift the phase angle D in the right switching tube 1‑2 Modulation is performed as another modulation degree of freedom. The present invention is suitable for non-heavy-load power transmission where the power p.u. transmission power is less than 0.667. Compared with the traditional double phase-shift modulation method, the backflow power is basically eliminated, and the isolated bidirectional full-bridge DC-DC converter is improved under non-heavy load. The efficiency of the converter is improved, and the adjustment range of the phase shift angle 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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Patent Type & Authority Patents(China)
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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