An AC-DC conversion circuit, AC-DC converter and control method thereof

An AC-DC conversion and circuit technology, applied in the field of AC-DC conversion, can solve the problems of difficulty in improving the efficiency of the converter, large volume and high cost of the AC-DC converter, and achieve the effect of improving the work efficiency.

Active Publication Date: 2018-08-21
ZHUHAI ENPOWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the entire AC-DC converter is large in size and high in cost, and it is difficult to improve the efficiency of the converter

Method used

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  • An AC-DC conversion circuit, AC-DC converter and control method thereof
  • An AC-DC conversion circuit, AC-DC converter and control method thereof
  • An AC-DC conversion circuit, AC-DC converter and control method thereof

Examples

Experimental program
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Effect test

no. 1 example

[0081] refer to Figure 5 , the AC-DC converter includes an AC-DC conversion circuit and a control unit 1, the AC-DC conversion circuit is the AC-DC conversion circuit in any of the above-mentioned embodiments, and the control unit 1 includes a drive circuit 11, a drive circuit 12, a drive circuit 13, a frequency phase Identification circuit 14, SPWM modulator 15, SPWM modulator 16, carrier signal generator 17, phase shift circuit 18 and control regulator 19, frequency phase identification circuit 14 is used for receiving AC voltage sampling signal V ac The driving circuit 11 is used to receive the control signal output by the frequency and phase identification circuit 14, and the driving circuit 11 drives the first switching tube Q1 and the second switching tube Q2 in the low frequency switching bridge arm.

[0082] The control regulator 19 is used to receive the AC voltage sampling signal V ac , AC current sampling signal i L1 and DC voltage sampling signal V dc , the car...

no. 3 example

[0107] The AC-DC converter includes an AC-DC conversion circuit and a control unit, the AC-DC conversion circuit can be the AC-DC conversion circuit in the above embodiment, and the control unit is used to implement the steps of the above control method when executing the computer program stored in the memory. The control unit can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

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Abstract

The invention provides an alternative / direct-current switching circuit, a transverter and a control method thereof. The alternative / direct-current switching circuit comprises a filtering circuit, a first high-frequency switch bridge arm, a second high-frequency switch bridge arm, a low-frequency switch bridge arm, another filtering circuit, an alternative-current end filtering capacitor and a common mode choke, wherein the filtering circuit, the first high-frequency switch bridge arm, the second high-frequency switch bridge arm and the low-frequency switch bridge arm are positioned at a direct-current end; the filtering circuit and the alternative-current end filtering capacitor are positioned at an alternative-current end; the common mode choke is used for connecting the two high-frequency switch bridge arms with an alternative-current end filtering inductor. By adopting the alternative / direct-current switching circuit, the ripple current of the alternative-current end can be reduced to 1 / 4 of original ripple current, each high-frequency switch bridge arm is connected with one winding of the common mode choke, generally the sensitive capacity of the common mode choke is very large, and common code current flowing through two windings is very small relative to differential mode current, so that the current of the two windings of the common mode choke is definitely appropriately equal, that is, the current at the alternative-current end is taken by two high-frequency switch bridge arm uniformly, automatic current equalization of a power circuit is achieved, and the working efficiency of the circuit is improved.

Description

technical field [0001] The invention relates to an AC-DC conversion technology, in particular to an AC-DC conversion circuit, an AC-DC converter and a control method thereof. Background technique [0002] In various applications such as new energy photovoltaic systems, energy storage systems, and electric vehicle charging systems, it is required that the energy in the power converter can flow in both directions: the energy can flow from the grid to the energy storage unit such as the battery to realize the storage of electric energy. At the same time, It is also required that energy can flow from the energy storage unit to the grid or be output in the form of AC power alone, so as to realize the regulation of grid power or meet the use of power under off-grid conditions. In order to realize the above functions, in addition to an efficient and practical isolated DC-DC converter, a non-isolated AC-DC bidirectional converter with higher efficiency, smaller size and lower cost i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/797
CPCH02M7/797
Inventor 魏标姜桂宾
Owner ZHUHAI ENPOWER ELECTRIC
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