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Bidirectional resonant conversion circuit, converter and control method thereof

A technology of resonant conversion and resonant capacitor, which is applied in the field of DC power conversion, can solve the problems of exacerbating the switching tube, reducing the working range during reverse operation, and the LLC resonant circuit is not suitable for working in the state of energy bidirectional flow, etc., to achieve wide working range effect

Active Publication Date: 2017-06-20
ZHUHAI ENPOWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the LLC circuit is not a symmetrical circuit topology. When the energy flows in the opposite direction, its circuit characteristics are no longer LLC resonance characteristics but degenerate into LC resonance characteristics, which greatly reduces the working range and aggravates the reverse operation. The difficulty of realizing soft switching of the switching tube
Therefore, the traditional LLC resonant circuit is not very suitable for working in the state of bidirectional energy flow

Method used

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  • Bidirectional resonant conversion circuit, converter and control method thereof
  • Bidirectional resonant conversion circuit, converter and control method thereof
  • Bidirectional resonant conversion circuit, converter and control method thereof

Examples

Experimental program
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Effect test

no. 1 example

[0084] refer to figure 2, the full-bridge resonant DC / DC converter includes an output circuit and a control module 20, the control module 20 includes an adjustment controller 14, a phase calculation circuit 15, a frequency calculation circuit 16, a pulse generation circuit 17, a phase shifting circuit 18 and a drive circuit 19, The output circuit includes a full bridge circuit 11, a resonant conversion circuit 12 and a rectification and filtering circuit 13 connected in sequence. The full bridge circuit 11 receives the input voltage and receives the switch control of the driving circuit 19, and the rectification and filtering circuit 13 outputs the working voltage and current.

[0085] refer to image 3 , the first bridge arm of the full bridge circuit is composed of the first switching tube Q1 and the second switching tube Q2, the second bridge arm of the full bridge circuit is composed of the third switching tube Q3 and the fourth switching tube Q4, the first switching tube...

no. 2 example

[0098] The full-bridge resonant DC / DC converter in the second embodiment includes an output circuit and a control module, wherein the output circuit can use the output circuit in the first embodiment, and the control module can use an MCU with computing power and store corresponding The memory of the software algorithm and the matching digital drive circuit, the control module includes an adjustment control module, a phase calculation module, a frequency calculation module, a pulse generation module, a phase shift module and a drive module, the adjustment control module receives preset signals and feedback signals, adjusts and controls The module calculates the control signal according to the preset signal and the feedback signal. The phase calculation module receives the control signal output by the adjustment controller, the frequency operation module receives the control signal output by the adjustment controller, and the pulse generation module receives the frequency signal ...

no. 3 example

[0110] refer to Figure 9, the third embodiment improves the resonant conversion circuit 37, specifically, the energy storage inductance Lm1 of the above embodiment can be integrated into the isolation transformer T1 in parallel with it as a magnetizing inductance, so it no longer appears in the circuit of the third embodiment .

[0111] The first embodiment of the control method of the bidirectional full-bridge resonant DC / DC converter:

[0112] Based on the converters of the first to third embodiments above, and the control method of the full-bridge resonant DC / DC converter, the control unit of the bidirectional full-bridge resonant DC / DC converter controls the converter, and the control method includes:

[0113] When the energy conversion direction is from the first filter circuit to the second filter circuit, the first flow direction conversion step is performed, that is, when the energy flows from the first DC port Vd1 to the second DC port Vd2;

[0114] The first flow ...

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PUM

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Abstract

The invention provides a bidirectional resonant conversion circuit, a converter and a control method thereof. The bidirectional resonant conversion circuit with a variable structure comprises a first filter circuit, a first full bridge circuit, a resonant conversion circuit, a second full bridge circuit and a second filter circuit, wherein resonant capacitors are respectively arranged on a primary side and a secondary side of the resonant conversion circuit, and are respectively turned on and off by a switch. The control method comprises the steps of allowing the full bridge circuit to enter an active switch mode or a diode mode according to an energy flow direction, thus respectively allowing the switch to be in a closed or blocked state. Therefore, efficient bidirectional conversion of energy is achieved, and the bidirectional full bridge resonant direct current / direct current converter with the variable structure and a control method thereof are more practical.

Description

technical field [0001] The invention relates to DC power conversion technology, in particular to a variable-structure bidirectional resonant conversion circuit, a bidirectional full-bridge resonant DC / DC converter, and a control method for the converter. 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, and 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. For safety considerations, this bidirectional energy conversion system is best able to achieve electrical isolation of inpu...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/3353Y02B70/10
Inventor 姜桂宾
Owner ZHUHAI ENPOWER ELECTRIC
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