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Three-phase tri-level LLC resonant converter

A technology of resonant converter and three-phase transformer, which is applied in the direction of adjusting electrical variables, high-efficiency power electronic conversion, and converting DC power input to DC power output. It can solve the problems of performance degradation and high price of MOSFET devices, and achieve volume reduction. Effect

Inactive Publication Date: 2010-07-07
LIEBERT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MOSFET devices suitable for high frequency and withstand voltage above 1000V are expensive and their performance has declined.

Method used

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  • Three-phase tri-level LLC resonant converter
  • Three-phase tri-level LLC resonant converter
  • Three-phase tri-level LLC resonant converter

Examples

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Effect test

specific Embodiment approach 1

[0030] Such as figure 1 A three-phase three-level LLC resonant converter shown is a typical three-phase three-level LLC resonant converter. It includes a voltage dividing capacitor, an inverter, a clamp circuit, a resonant circuit, a three-phase transformer, a rectifier circuit, and a filter circuit.

[0031] The voltage dividing capacitor is two same polarity capacitors C1 and C2. The positive pole of the polar capacitor C1 is connected to the positive pole of the input voltage source Vin, and the negative pole of the polar capacitor C1 is connected to the positive pole of the polar capacitor C2 as the midpoint of the voltage dividing capacitor. , the negative pole of the polarized capacitor C2 is connected to the negative pole of the input voltage source Vin, and the input voltage source Vin is equally divided into two voltage sources whose voltage is only half of it.

[0032] The inverter consists of three three-level bridge arms connected in parallel to invert the DC vol...

specific Embodiment approach 2

[0076] Such as figure 2 A three-phase three-level LLC resonant converter shown is a modified three-phase three-level LLC resonant converter. It also includes voltage dividing capacitors, inverters, clamping circuits, resonant circuits, three-phase transformers, rectifier circuits, and filter circuits. The difference from Embodiment 1 is that: the Y-shaped connection point of the primary winding of the three-phase transformer is connected to the middle point of the voltage dividing capacitor.

[0077] The second embodiment has basically the same beneficial effects as the first embodiment.

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Abstract

The invention relates to a three-phase tri-level LLC resonant converter, which comprises an inverter, a three-phase transformer, a resonant circuit, a three-phase rectification circuit and a filter circuit, wherein the inverter is formed by connecting three tri-level bridge arms in parallel; the resonant circuit is formed by three groups of resonant capacitors and resonant inductances that are connected and three excitation circuits of the three-phase transformer; the three-phase rectification circuit is connected with the secondary edge of the three-phase transformer; and the filter circuit is connected with the output end of the three-phase rectification circuit. The three-phase tri-level LLC resonant converter is provided with a partial voltage capacitor used for equally dividing an input voltage source into two voltage sources with the voltage being half of the input voltage source; the three-phase tri-level LLC resonant converter is also provided with three groups of clamping circuits with zero-potential points being connected with the central point of the partial voltage capacitor, and the voltage stress endured by each switching pipe is clamped into half of the input voltage. The invention solves the problem that that the ripple current of an output filter circuit of a half-bridge LLC resonant converter, and the voltage stress of each switching pipe is half of the input voltage; in addition, the ripple frequency of the output current of the output filter circuit is improved by 6 times of the frequency of the switching pipe, and a filter element with smaller volume can be adopted, so that the volume of the output filter circuit is reduced.

Description

technical field [0001] The invention relates to resonant conversion, in particular to a three-phase three-level LLC resonant converter. Background technique [0002] Chinese patent CN1242539C announced a "LLC series resonant DC / DC converter", the DC / DC converter is a half-bridge LLC resonant converter, and its typical circuit is as follows Figure 4 shown. It contains a square wave generator with a half-bridge structure composed of two main switch tubes S1 and S2. The driving signal of the square wave generator is a complementary signal with a fixed 50% duty cycle, which is used to generate a series of square wave waveforms. The output voltage. The DC / DC converter also includes a resonant network connected to the square wave generator. The resonant network is composed of a series capacitor Cr, a series inductance Lr and a magnetizing inductance Lm, and is connected between the midpoint of the half bridge and the ground. The resonant capacitor Cr also acts as a DC blocking ...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/08H02M1/14
CPCY02B70/1433Y02B70/10Y02P80/10
Inventor 胡永辉黄庆义弗兰克·赫尔特
Owner LIEBERT
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