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LLC topological structure of DC/DC converter

A topology and converter technology, applied in the direction of converting AC power input to DC power output, DC power input converting to DC power output, and irreversible AC power input converting to DC power output, etc., can solve the input and output voltage difference. Large, non-adjustable output, low efficiency, etc., to achieve the effect of small output ripple, solving life problems, and high usability

Pending Publication Date: 2021-02-05
SHENZHEN INCREASE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses LLC+chopper module, a total of 2-stage topology to achieve output adjustable function, its efficiency is not high
In addition, the Buck circuit is a step-down topology, so the output voltage of the front-stage LLC must be higher than the maximum voltage required by the load, because the front-stage LLC is controlled by a fixed-frequency open-loop, and the output cannot be adjusted. When the voltage required by the load is The lowest voltage is, the input and output voltage difference of the Buck circuit is extremely large, and its efficiency will be further reduced

Method used

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  • LLC topological structure of DC/DC converter
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  • LLC topological structure of DC/DC converter

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , figure 2 , Figure 3-1 , Figure 3-2 , Figure 4 , the DC / DC converter LLC topology structure of the present invention includes a switch network, a resonant network and a rectifier network. The switch network is composed of two sets of bridge switches connected in series, and each set of bridge switches is connected in parallel by three sets of standard H-bridge circuits. Form a switch sub-network and then form the switch network in series, wherein the output of each group of bridge switches is connected to the primary coils of a group of transformers forming a resonant network, and the secondary side of each group of transformers and each primary coil are correspondingly provided with 2 Secondary coils (two independent windings), the three secondary coils (windings) of each group of transformers are star-connected, and their outputs are respectively connected to the rectifier sub-network. The rectification network consists of two parts, which are re...

Embodiment 2

[0032] see Figure 5 , the DC / DC converter LLC topology of this embodiment differs from that of Embodiment 1 in that the sub-networks Rtf1 and Rtf2 are connected in series, which is suitable for occasions requiring higher voltages.

Embodiment 3

[0034] see Figure 6 , the DC / DC converter LLC topology of this embodiment differs from that of Embodiment 1 in that the sub-networks Rtf1-1 and Rtf1-2, and Rtf2-1 and Rtf2-2 respectively adopt the parallel connection method, which is applicable to the requirements higher current applications.

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Abstract

The invention relates to a topological structure of a charging pile / charging device converter. An LLC topological structure of a DC / DC converter comprises a switching network, a resonance network anda rectification network, the switching network is formed by connecting two bridge switches in series, and each bridge switch is formed by connecting three standard H-bridge circuits in parallel to form a switching sub-network and then connecting the three standard H-bridge circuits in series to form the switching network; the output of each group of bridge switches is connected with the primary coil of one group of transformers forming a resonance network, the secondary side of each group of transformers and each primary coil are correspondingly provided with two secondary coils, the three secondary coils of each group of transformers adopt a star connection method, and the output of the three secondary coils of each group of transformers is respectively connected with a commutator network. The LLC topological structure is suitable for high-power, wide-voltage and constant-power output, and has the characteristics that the output constant power is continuous, the output does not have switching action, and the safety and reliability of a product are improved.

Description

technical field [0001] The invention relates to a charging pile / charging device converter topology. Background technique [0002] According to the market demand of the charging pile industry, DC charging piles are evolving in the direction of high power (30kW and above), wide voltage, and constant power output (200V~1000V constant power output). Many manufacturers in the market are using circuits with LLC topology, but traditional LLC solutions cannot achieve wide voltage constant power output. Some improved LLC schemes use the structure of 2-way LLC, and realize the series mode (constant power in the low-voltage range of 300-500) or parallel mode (constant power in the high-voltage range of 500-750) of the output of the 2-way LLC through the relay, and then realize Wide voltage constant power output. This solution has obvious disadvantages. First, the relay is a mechanical component and its service life is limited. Second, when the relay is switched, the output power is i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/06
CPCH02M3/33569H02M7/066H02M7/068H02M1/0067Y02B70/10
Inventor 霍焰
Owner SHENZHEN INCREASE TECH CO LTD