A bidirectional full-bridge resonant DC/DC converter and its control method

A DC converter and resonant DC technology, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc. The switch tube cannot achieve zero current turn-on and other problems to achieve practical effects

Active Publication Date: 2018-06-26
ZHUHAI ENPOWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it has two defects: one is that the secondary side rectifier tube cannot realize zero-current turn-off, and the other is that the primary-side switch tube cannot realize zero-current turn-on under light load conditions.
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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  • A bidirectional full-bridge resonant DC/DC converter and its control method
  • A bidirectional full-bridge resonant DC/DC converter and its control method
  • A bidirectional full-bridge resonant DC/DC converter and its control method

Examples

Experimental program
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Effect test

no. 1 example

[0073] 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 circuit 12 and a rectifying 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 rectifying and filtering circuit 13 outputs an operating current.

[0074] refer to image 3 , the super-forearm of the full-bridge circuit is composed of the first switching tube Q1 and the second switching tube Q2, the lagging arm of the full-bridge circuit is composed of the third switching tube Q3 and the fourth switching tube Q4, the first switching tube Q1 and the third switching tube Th...

no. 2 example

[0087] 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

[0099] refer to Figure 9 The third embodiment improves the resonant circuit 63. Specifically, the energy storage inductance Lm1 of the above embodiment can be integrated into the isolation transformer T1 connected in parallel with it as a magnetizing inductance, so it no longer appears in the circuit of the third embodiment.

[0100] The first embodiment of the control method of the bidirectional full-bridge resonant DC / DC converter:

[0101] 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:

[0102] 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;

[0103] The first flow dire...

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PUM

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Abstract

The present invention provides a bidirectional full-bridge resonant DC / DC converter and its control method. The converter includes a first filter circuit, a first full-bridge circuit, a resonant conversion circuit, a second full-bridge circuit and a second filter circuit connected in sequence. The circuit, and also includes a control unit, the control unit respectively collects the working current of the first filter circuit and the second filter circuit, and the control unit respectively controls the first full bridge circuit and the second full bridge circuit according to preset signals. The control method includes putting the full bridge circuit into active switching mode or diode mode according to the direction of energy flow. Then, high-efficiency bidirectional conversion of energy is realized, which makes the bidirectional full-bridge resonant DC / DC converter and its control method more practical.

Description

technical field [0001] The invention designs DC power conversion technology, and in particular relates to 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 input and output. At present, the non-isolated AC-DC conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353H02M3/33553H02M3/33569H02M1/0058Y02B70/10
Inventor 姜桂宾
Owner ZHUHAI ENPOWER ELECTRIC
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