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Bridge-based isolation type high-gain DC/DC converter

A converter and isolation technology, applied to output power conversion devices, DC power input conversion to DC power output, instruments, etc., can solve the problems of low rectification side circuit gain, high system cost, complex control strategy, etc., to achieve Increased gain, high efficiency, simple control strategy and drive circuit

Active Publication Date: 2018-11-23
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of complex control strategy, high system cost, and low gain of the rectification side circuit caused by the uneven flow of each input phase current in the prior art, the present invention proposes a bridge-based isolated high-gain DC / DC converter

Method used

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  • Bridge-based isolation type high-gain DC/DC converter
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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the drawings.

[0033] Such as figure 2 As shown, a high-gain DC / DC converter based on bridge-type 2 gain units includes a DC input power supply, a bridge inverter, 4 high-frequency transformers with a ratio of 1:N, and 2 One gain unit, one output diode D 0 , An output filter capacitor C 0 , Load R L . Transformer T 1 To T 4 The other end of the primary side is connected, the transformer T 1 To T 4 The other end of the secondary side is connected. among them

[0034] The bridge inverter includes: two input side filter capacitors C 1 , C 2 , 2 bridge arms, each bridge arm contains 2 power switches, and 2 bridge arms correspond to 4 input phases.

[0035] The specific connection method is:

[0036] Input side filter capacitor C 1 The other end and capacitor C 2 One end is connected, the connection point is marked as node 0, C 1 One end is connected to the positive pole of the DC power supply, C...

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Abstract

Disclosed is a bridge-based isolation type high-gain DC / DC converter. If a converter is set to comprise 2m input phases, m bridge arms and n gain units, and is configured to comprise a direct currentinput voltage source and m bridge arms, wherein each bridge arm comprises two power switches; the upper side and the lower side of the bridge arm are connected with a direct-current power supply, andare connected with two capacitors C1 and C2, 2m high-frequency transformers T1, T2, T3 until T2m with the transformation ratio of 1:N, n gain units, an output filtering capacitor C0, an output diode D0 and a load RL in parallel; in each gain unit, the gain unit 1 comprises 2m-1 capacitors and 2m-1 diodes; and each of the gain unit 2 to the gain unit n comprises 2m capacitors and 2m diodes separately. Compared with the existing bridge type isolated DC / DC converter, the number of the bridge arms can be freely adjusted, and the currents of all the input phases can be automatically subjected to current-sharing, so that the voltage stress and the current stress of all switches and diodes can be obviously lowered and can be adjusted; and input and output gain is high and can also be adjusted, sothat the converter is suitable for high-capacity application occasions needing input-output electrical isolation.

Description

Technical field [0001] The invention relates to a DC-DC converter, in particular to an isolated high-gain DC / DC converter based on a bridge type. Background technique [0002] In recent years, the problem of energy depletion and environmental pollution has become increasingly severe. The development of offshore wind resources has important practical significance. Large-capacity and long-distance offshore wind power is the trend of future wind power development. Because the traditional AC convergence has many disadvantages such as frequency synchronization and high harmonic content, the offshore wind power DC convergence method has received more and more research and attention, and the large-capacity and high-gain DC / DC converter is its realization One of the key technologies is also one of the difficulties that limit the concrete realization of DC confluence. The traditional diode bridge rectifier is widely used, but on the one hand, its input and output voltage gain is low, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/3353
Inventor 邾玢鑫段宛宜刘崧杨玉良余志林
Owner CHINA THREE GORGES UNIV
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