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Power conversion units connected in parallel

A power conversion device and parallel technology are applied in the conversion device of output power, the conversion equipment that converts AC power input to AC power output, and can be converted to DC without intermediate conversion, etc. Reduce and other problems to achieve the effect of reducing efficiency

Active Publication Date: 2009-09-09
VERTIV CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the Q value is reduced, which leads to a lot of reduction in the efficiency of the whole machine

Method used

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  • Power conversion units connected in parallel
  • Power conversion units connected in parallel
  • Power conversion units connected in parallel

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Embodiment Construction

[0067] Such as figure 1 with 6 As shown, in the parallel power conversion device of the present invention, a voltage adjustment circuit is added at the front end of the power conversion circuit, because the change of the input voltage will also cause the change of the output voltage, by adjusting the input of the power conversion circuit The change of the voltage is used to adjust the voltage gain of the power conversion circuit of the branch circuit, so as to achieve the purpose of adjusting the current sharing. When the power conversion circuit is a resonant circuit, when the fs of the resonant circuit is fixed, the change of the input voltage of the resonant circuit will cause the change of the output voltage. By adjusting the output voltage of the circuit, the output voltage of the resonant circuit can be adjusted. To achieve the purpose of adjusting the current balance. Resonant circuits referred to here are all topological circuits that work in resonance. That is: inc...

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Abstract

The invention relates to a power conversion unit connected in parallel, which comprises N power conversion circuits, N or N-1 voltage adjusting circuits and a control circuit connected in parallel between a power supply and a load, wherein N is more than or equal to 2, each voltage adjusting circuit is arranged at the front end of one power conversion circuit respectively, and the control circuit is applied to detecting output voltage of each power conversion circuit and sending control signals to the voltage adjusting circuits so as to adjust the output voltage of the voltage adjusting circuits, and each power conversion circuit has same output current. The power conversion unit solves the problems that when the resonant parameters of the power conversion circuits have differences, branch current is unbalanced and even certain branches do not transmit power to secondary sides. Besides, the power conversion unit cannot increase the output impedance and reduce the Q values of the power conversion circuits to make the efficiency of the complete machine reduced a lot.

Description

technical field [0001] The present invention relates to a power conversion device, more specifically, to a parallel power conversion device. Background technique [0002] For interleaved and parallel-connected power conversion circuits, especially in the case of achieving high-efficiency power conversion through a resonance scheme, how to ensure that the output currents of the power conversion circuits in each branch are balanced is a very important issue. The unbalanced current of each branch will cause the current stress of the branch to be different, and the path with high current will generate serious heat, reduce the reliability and shorten the service life. Therefore, ensuring the current sharing characteristics of the power conversion circuits of each branch is a very important design link of the interleaved parallel power conversion circuits. [0003] When the power conversion circuit adopts a resonant circuit, Vout=F(fs, C 1 , C 2 ...,L 1 , L 2 ,...), where, Vo...

Claims

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Application Information

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IPC IPC(8): H02M1/00H02M5/06H02M5/293
Inventor 张强朱春辉柳树渡吕华军潘诗峰
Owner VERTIV CORP
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