Trajectory control method for dual transformer series resonant dual active bridge dc-dc converter topology

A DC-DC, series resonance technology, applied in the direction of control/regulation system, conversion of DC power input to DC power output, instruments, etc., can solve the problems of effective control of DAB converter topology trajectory, so as to improve control flexibility and reduce Effect of circulating current and improving efficiency

Active Publication Date: 2021-03-05
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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  • Trajectory control method for dual transformer series resonant dual active bridge dc-dc converter topology
  • Trajectory control method for dual transformer series resonant dual active bridge dc-dc converter topology
  • Trajectory control method for dual transformer series resonant dual 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, which can realize bidirectional energy flow, and realize soft switching in the full voltage and full load range, which can be used in uninterruptible power supplies, electric vehicles and comprehensive in the energy storage system.

[0026] The dual transformer series resonant dual active bridge DC-DC converter topology, as figure 1 As shown, including LC resonant 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 tank 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 cavi...

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Abstract

The invention discloses a track control method of a dual-transformer series resonance dual-active bridge DC-DC converter topology. This method first designs the control locus of the primary and secondary side shifting the phase angle outward and the secondary side shifting the phase angle inward. The high-voltage side voltage and the low-voltage side voltage of the converter are sampled through the sampling circuit. The digital control circuit is used to calculate the external phase angle of the primary and secondary sides and the internal phase angle of the secondary side of the current control variable. According to the control track, control the original secondary side external phase angle and the secondary side internal phase angle to always move along the track, so as to ensure soft switching conditions and minimum circulation control; output the control quantity through the drive circuit, and then control the operation of the converter . In this method, the closed-loop control follows the control trajectory based on fundamental wave analysis (FCA) by adjusting the phase shift angle and high-level duty cycle, which can greatly improve control flexibility, significantly reduce circulating current, improve efficiency, and ensure All soft switching is achieved over the full load range.

Description

technical field [0001] The invention relates to a control method of a resonant bidirectional converter topology applied to a wide input and wide output condition, that is, a track control method of a series resonant dual active bridge DC-DC converter topology of a double transformer, belonging to isolation in power electronics High-frequency power conversion technology field. Background technique [0002] Bidirectional DC-DC converters are widely used in the power interface 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 Preferred topology. [0003] At present, many literatures have proposed many modulation strategies for dual active bridge (DAB) converters. Using the single-phase phase-shift (SPS) control method, zero-voltage switching (ZVS) of all switching tubes can be realized, but when ...

Claims

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Application Information

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Patent Type & Authority Patents(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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