Track control method of double-transformer series resonance double-active-bridge DC-DC converter topology

A DC-DC, series resonance technology, used in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as effective control of the topology trajectory of DAB converters, and improve control flexibility, good performance, the effect of reducing the circulating current

Active Publication Date: 2020-08-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to effectively control the topological trajectory of the DAB converter, there is no relevant literature published

Method used

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  • Track control method of double-transformer series resonance double-active-bridge DC-DC converter topology
  • Track control method of double-transformer series resonance double-active-bridge DC-DC converter topology
  • Track control method of double-transformer series resonance double-active-bridge DC-DC converter topology

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Embodiment

[0025] In this embodiment, the high-voltage input DC voltage is 240-400V, the low-voltage output DC voltage is 48V, and the rated power is 1000W. It can realize bidirectional energy flow, and realize soft switching at full voltage and full load range. It can be used for uninterruptible power supplies, electric vehicles, and integrated Energy storage system.

[0026] The dual transformer series resonant dual active bridge DC-DC converter topology, such as figure 1 Shown, including LC resonance unit, an H bridge, a hybrid bridge, high-frequency transformer T 1 , High frequency transformer T 2 And filters. Among them, the high-voltage switch tube uses SiC devices, and the low-voltage side uses MOSFETs. The resonant circuit is on the high-voltage side, and the low-voltage side connects the two transformers to the three midpoints of the hybrid bridge.

[0027] Among them, the high-voltage side of the converter is composed of a full-bridge circuit and a resonant cavity. The full bridge...

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Abstract

The invention discloses a track control method of a double-transformer series resonance double-active-bridge DC-DC converter topology. The method comprises the steps of firstly designing control tracks of a primary side outer phase shift angle and a secondary side inner phase shift angle of a converter; through the sampling circuit, the high-voltage side voltage and the low-voltage side voltage ofthe converter are sampled. The original secondary side outer phase shift angle and the secondary side inner phase shift angle of a current control variable are calculated through a digital control circuit. According to the control track, the original secondary side outer phase shift angle and the secondary side inner phase shift angle are controlled to move along the track all the time such thatsoft switching conditions and minimum loop current control are guaranteed; the control quantity is output through a drive circuit, and then the converter is controlled to operate. According to the method, the closed-loop control follows a control track based on fundamental wave analysis (FCA) by adjusting a phase shift angle and a high-level duty ratio such that the control flexibility can be greatly improved, the circulating current can be remarkably reduced, the efficiency can be improved, and all soft switches in a full-load range are ensured to be realized.

Description

Technical field [0001] The present invention relates to a method for controlling a resonant bidirectional converter topology under the condition of wide input and wide output, that is, a trajectory control method for a series resonant dual active bridge DC-DC converter topology of dual transformers, belonging to isolation in power electronics High frequency power conversion technology field. Background technique [0002] Bidirectional DC-DC converters are widely used in power interfaces of electric vehicles, solid-state transformers and energy storage systems. Among them, the isolated bidirectional dual active bridge (DAB) DC-DC converter composed of two active bridges and a high-frequency transformer has become a high-power converter due to its high power density, bidirectional power transmission capability, and zero voltage switching (ZVS). Preferred topology. [0003] At present, many documents have proposed many modulation strategies for dual active bridge (DAB) converters. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33584H02M1/0003H02M1/0058Y02B70/10
Inventor 沙德尚贾相帅钟洪亮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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