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Design method of resonant tank parameters of bidirectional DC-DC converter

A technology of DC-DC and design method, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., which can solve the problems of cumbersome design process and achieve the effect of accurate parameters and simple design process

Active Publication Date: 2018-09-21
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for designing the resonant tank parameters of a bidirectional DC-DC converter, which solves the need for trial and error, repeated iterations, and cumbersome design process when designing the resonant tank parameters of a symmetrical LLC resonant bidirectional DC-DC converter. The problem

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  • Design method of resonant tank parameters of bidirectional DC-DC converter
  • Design method of resonant tank parameters of bidirectional DC-DC converter
  • Design method of resonant tank parameters of bidirectional DC-DC converter

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Embodiment Construction

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] Symmetrical LLC resonant bidirectional DC-DC converter such as figure 1 As shown, it includes a first switch network, a resonant tank, a second switch network, a first power supply and a second power supply, the two ends of the DC side of the first switch network are respectively connected to the two ends of the first power supply, the first switch network The two ends of the AC side are connected to the input end of the resonance tank, and the second power supply is connected to the output end of the resonance tank through the second switch network.

[0050] The first switching network includes a switching tube Q 1 , switch tube Q 2 , switch tube Q 3 , switch tube Q 4 , capacitance C 1 , capacitance C 2 , capacitance C 3 , capacitance C 4 , Diode D 1 , Diode D 2 , Diode D 3 , Diode D 4 .

[0051] The resonance tank includ...

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Abstract

The invention discloses a design method of the resonant tank parameters of a bidirectional DC-DC converter. The method includes the following steps that: step 1, the ratio k of the first resonant inductance and excitation inductance of the primary side of a transformer is calculated; step 2, the maximum value Qmax of a quality factor Q is obtained according to an equation described in the descriptions of the invention and a minimum normalized frequency fn,min, namely, Qmax is adopted as the value of Q; and step 3, the resonant tank parameters Lr1, Lr2, Lm, Cr1 and Cr2 are calculated accordingto equations described in the descriptions of the invention. With the design method of the invention adopted, the problem of repeated trial matching, repeated iteration, and complicated design processes in the design of the resonant tank parameters of a symmetric type LLC resonant bidirectional DC-DC converter can be solved.

Description

technical field [0001] The invention belongs to the technical field of converter parameter design, and relates to a method for designing the parameters of a resonant tank of a bidirectional DC-DC converter. Background technique [0002] The high-power isolated bidirectional DC-DC converter can realize the functions of DC transformation, bidirectional energy transmission and electrical isolation. It has application prospects in the fields of electric vehicles, renewable energy, DC power distribution systems, uninterruptible power supply systems, and power electronic transformers. broad. [0003] Since the DC-DC converter topology using LLC resonance has natural soft switching characteristics, it can realize zero-voltage conduction of the inverter switch on the primary side of the transformer and zero-voltage conduction of the rectifier diode on the secondary side of the transformer in a wide range of input voltage and full load. The advantages of current shutdown, no need fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33584H02M1/0058Y02B70/10
Inventor 陈桂涛李海平孙向东白力静
Owner XIAN UNIV OF TECH
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