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An isolated bidirectional AC/DC conversion circuit and a control method thereof

A technology of AC-DC conversion and DC conversion unit, which is applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, control/regulation system, etc., which can solve the problem of low working efficiency and AC-DC bidirectional conversion circuit Complicated design, difficult to achieve high-frequency isolation and other issues, to achieve the effect of reducing switching loss, suppressing AC anti-bias function, and reducing turn-on and turn-off stress

Pending Publication Date: 2018-12-18
NANJING PANDA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to propose an isolated bidirectional AC-DC conversion circuit and its control method, as well as a control method that can work in standby mode, rectification mode and inverter mode, so as to solve the existing AC-DC bidirectional conversion circuit design Complicated, difficult to achieve high-frequency isolation and technical problems with low work efficiency

Method used

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  • An isolated bidirectional AC/DC conversion circuit and a control method thereof
  • An isolated bidirectional AC/DC conversion circuit and a control method thereof
  • An isolated bidirectional AC/DC conversion circuit and a control method thereof

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Embodiment 1

[0031] like figure 1 As shown, an isolated bidirectional AC-DC conversion circuit provided by an embodiment of the present invention includes an input filter 100, an input transformer 200, an AC rectification unit 300, an energy storage filter unit 400, a DC-DC conversion unit 500, and an output energy storage Unit 600;

[0032] The input end of the input filter 100 is connected to the AC signal, the output end of the input filter 100 is connected to the two opposite ends of the input transformer 200, and the other two opposite ends of the input transformer 200 are connected to the input end of the AC rectification unit 300 , the output end of the output end of the AC rectification unit 300 is connected to the input end of the energy storage filter unit 400, the output end of the energy storage filter unit 400 is connected to the input end of the DC-DC conversion unit 500, and the output end of the DC-DC conversion unit 500 It is connected with the input end of the output ene...

Embodiment 2

[0045] An embodiment of the present invention provides a control method for the above-mentioned isolated bidirectional AC-DC conversion circuit, which is used to control the switching operation of the circuit between the standby mode, the rectification mode and the inverter mode, and the control method includes:

[0046] When the circuit works in the rectification mode, the AC rectification unit is controlled to rectify the input signal; the high-frequency conversion unit is controlled to perform high-frequency conversion on the rectified signal; when the current of the DC signal connected to the output end of the output energy storage unit is equal to or greater than the preset value, make the DC rectification unit in synchronous rectification state;

[0047] When the circuit works in the inverter mode, the DC rectification unit is controlled to rectify the DC signal connected to the output end of the output energy storage unit, and at the same time the AC rectification unit i...

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Abstract

The invention discloses an isolated bidirectional AC / DC conversion circuit and a control method thereof. The conversion circuit comprises an input filter, an input transformer, an AC rectifier unit, an energy storage filter unit, a DC. DC conversion unit, output energy storage unit. The circuit of the invention can make the circuit work in different modes of rectification, inversion or standby modes according to external communication commands or judgement of other external voltage and current signals. At the same time, the input transformer can realize the energy storage function of the circuit in inverter or rectifier mode, at the same time, it can effectively restrain the common-mode current of the AC side and the AC anti-bias detection function, and effectively reduce the common-mode interference of the AC rectifier unit to the ground.

Description

technical field [0001] The invention relates to a switching power supply, in particular to an isolated bidirectional AC-DC conversion circuit and a control method thereof. Background technique [0002] Today's energy storage system inverters, hybrid power grid-connected inverters, lithium battery factory composition capacity, aging detection, etc., are all applications that require AC-DC bidirectional conversion (that is, rectification and inverter modes) Occasions, especially testing equipment, require high precision; because low-frequency transformer isolation technology is relatively mature and stable, traditional solutions mainly use high-frequency inverters to cooperate with low-frequency isolation transformers, so the volume is large, and in the field of low power Poor cost performance; Later, it may be realized with two sets of rectification and inverter circuits, but the cost performance is still poor. The main reason is that it is difficult to realize the high frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M3/335
CPCH02M3/3353H02M7/797H02M1/123H02M1/0058Y02B70/10
Inventor 刘斌李伦武李玲
Owner NANJING PANDA ELECTRONICS
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