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Improved bidirectional half-bridge three-level LLC direct-current converter and synchronous control method thereof

A half-bridge three-level, DC converter technology, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems. Converter output voltage adjustment range and other issues, to achieve the effect of reducing conduction loss, improving efficiency, and wide-range output voltage adjustable ability

Pending Publication Date: 2020-06-02
合肥博鳌电气科技有限公司
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  • Abstract
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Problems solved by technology

However, when the converter operates at a switching frequency lower than the resonance frequency, there will be power backflow, which reduces the voltage gain of the converter and reduces the range of output voltage regulation of the converter

Method used

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  • Improved bidirectional half-bridge three-level LLC direct-current converter and synchronous control method thereof
  • Improved bidirectional half-bridge three-level LLC direct-current converter and synchronous control method thereof
  • Improved bidirectional half-bridge three-level LLC direct-current converter and synchronous control method thereof

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Embodiment Construction

[0022]An improved bidirectional half-bridge three-level LLC DC converter is characterized in that it includes a power supply Vin and a power supply Vo. Define the forward work of the circuit as the energy transfer from the power supply Vin to the power supply Vo, and the reverse operation as the energy transfer from the power supply Vo to the power supply Vin. Components of the Vin side of the power supply: DC side bus voltage Vin, total bus capacitance Cin, the positive pole of the capacitor Cin connected to the positive pole of the DC bus, the negative pole of the capacitor Cin connected to the negative pole of the DC bus, the voltage dividing capacitors Cin1 and Cin2 connected in series on the DC side, and the capacitor The positive pole of Cin1 is connected to the positive pole of the DC bus, the negative pole of the capacitor Cin1 is connected to the positive pole of the capacitor Cin2, which is defined as the middle point B of the converter, and the negative pole of the c...

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Abstract

The invention discloses an improved bidirectional half-bridge three-level LLC direct-current converter and a synchronous control method thereof. When the switching frequency is greater than the resonant frequency, the synchronous control method is adopted, that is, the driving signals of a power supply Vin side and a power supply Vo side are synchronous; and when the switching frequency is less than or equal to the resonant frequency, an improved synchronous control method is adopted, that is, the driving signal on the power supply Vin side is unchanged, the frequency of the driving signal onthe power supply Vo side is equal to that of the power supply Vin side, but the conduction time of the driving signal is kept constant and is always half of the resonant period. The topological structure of the bidirectional half-bridge three-level LLC resonant converter is symmetrical, and the forward working principle and the reverse working principle of the circuit are the same. The converter adopts variable frequency control, and the output voltage can be controlled only by changing the switching frequency. The converter improves the voltage grade and the power grade of the circuit, the input side switching tube realizes soft switching in a full load range, and the output side uses the switching tube to replace a traditional diode, so that the conduction loss can be effectively reduced.

Description

technical field [0001] The invention relates to a bidirectional DC converter, in particular to an improved bidirectional half-bridge three-level LLC DC converter and a synchronous control method thereof. Background technique [0002] In recent years, with the continuous consumption of fossil energy and the impact of global warming becoming more and more obvious, new energy technology has received more and more attention. Bidirectional DC / DC converters that can realize bidirectional energy flow are an important part of the energy storage link. Under the current application background of new energy vehicles, micro-grids and other energy storage devices that require supercapacitors and batteries, it has ushered in another peak in its research direction, and is developing in the direction of high efficiency and high power density. Although the traditional phase-shifted full-bridge DC / DC converter has a simple structure, it has obvious problems such as narrow soft-switching range...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/088
CPCH02M3/33584H02M1/088H02M1/0058Y02B70/10
Inventor 何立灿
Owner 合肥博鳌电气科技有限公司
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