A novel soft-switching bidirectional DC-DC converter topology based on LLC resonance

A DC-DC and converter technology, applied in the field of novel soft-switching bidirectional DC-DC converter topology, can solve the problems of increasing control complexity and difficulty in popularization

Inactive Publication Date: 2018-12-11
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional LLC-based bidirectional DC-DC converters, in the case of asymmetry on both sides, need to increase the control loop in order to realize the respective LLC characteristics, which increases the complexity of the control and is difficult to popularize

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  • A novel soft-switching bidirectional DC-DC converter topology based on LLC resonance
  • A novel soft-switching bidirectional DC-DC converter topology based on LLC resonance
  • A novel soft-switching bidirectional DC-DC converter topology based on LLC resonance

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Embodiment Construction

[0029] In order to solve practical problems, an embodiment of the present invention provides a novel soft-switching bidirectional DC-DC converter device based on LLC resonance.

[0030] like figure 1 As shown, the bidirectional DC-DC converter device provided by the embodiment of the invention includes a high voltage side, a resonant network, a high voltage side and a high frequency isolation transformer T.

[0031] The high-voltage side of the bidirectional DC-DC converter includes C1, C2, Q1, and Q2, wherein D1 and Co1 are the body diode and junction capacitance of the switching transistor Q1, and D2 and Co2 are the body diode and junction capacitance of the switching transistor Q2.

[0032] The resonant network of the bidirectional DC-DC converter includes Lm1, Lr, Cr, and Lm2, wherein Lr is the resonant inductance, Cr is the resonant capacitor, Lm1 is the equivalent excitation inductance of the primary side of the transformer, and Lm2 is the newly added auxiliary excitatio...

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Abstract

The invention discloses a novel soft-switching bi-directional DC-DC converter based on LLC resonance. The typology consists of three parts: high-pressure side, low-pressure side and harmonic oscillation network. The high-voltage side adopts the structure of half-bridge voltage doubling, which is suitable for high-voltage coupling and easy to expand and cascade. Low-voltage side adopts push-pull half-bridge structure, which is suitable for low-voltage and high-current battery charging and discharging situation. Resonant network adopts a structure of adding a resonance inductor on a traditionalinductor-Inductor--capacitor LLC structure, and synchronous finishing is used to reduce the loss of the switching transistors when the high and low voltage sides are used as rectifiers respectively. The improved resonant network can realize LLC resonant soft-switching when the power flows bidirectionally. The invention can effectively improve the gain ratio of the converter, reduce the turn ratioof the isolation transformer, simultaneously reduce the volume and weight of the converter, improve the electromagnetic compatibility of the converter, and realize high-efficiency, high-frequency isolated bi-directional DC- DC power conversion.

Description

technical field [0001] The invention belongs to the technical field of power electronics applications, and in particular relates to a novel soft-switching bidirectional DC-DC converter topology based on LLC resonance. Background technique [0002] A bidirectional DC-DC converter refers to a DC-DC converter in which the polarity of the DC voltage on both sides of the converter remains unchanged and energy can be transmitted bidirectionally. Compared with the scheme of using two sets of unidirectional DC-DC converters to achieve bidirectional energy transmission, the bidirectional DC-DC converter uses the same converter to achieve bidirectional energy transmission, which has the advantages of high efficiency, small size, and low cost. . In the face of rapid changes in the global environment and rising pressure on energy conservation and emission reduction, the demand for bidirectional DC-DC converters is increasing. Bidirectional DC-DC converters have broad application prosp...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33584H02M3/33592H02M1/0058Y02B70/10
Inventor 易灵芝李青平胡炎申龙辛朱和潇
Owner XIANGTAN UNIV
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