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Parallel-series combination isolated converter transformer ratio design method

A technology of isolation converter and series combination, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc. It can solve the problems of unoptimized design, high voltage stress of rectifier diodes, etc., and reduce volume and weight , The effect of reducing voltage stress

Active Publication Date: 2016-07-27
忱芯科技(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transformation ratio of the traditional parallel-series combined isolation converter is equal, which will cause the voltage stress of the rectifier diode to be still high, and the optimal design cannot be obtained

Method used

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  • Parallel-series combination isolated converter transformer ratio design method
  • Parallel-series combination isolated converter transformer ratio design method
  • Parallel-series combination isolated converter transformer ratio design method

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Experimental program
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Embodiment

[0031] The following takes the parallel-series full-bridge converter as an example for detailed analysis, such as figure 2 shown. The switch circuit of the parallel-series full-bridge converter is a full-bridge circuit topology, and the rectification circuit is a full-bridge rectification circuit.

[0032] Input voltage U in : 20-70V, output voltage U o : 380V, maximum limit of diode voltage stress U Dmax : 600V, the maximum set error value ΔU: 50V, the output power P o : 1kW, switching period T s : 10μs.

[0033] Neglecting the dead time between the switches of the same bridge arm, the relationship between the input and output voltages of the converter is:

[0034]

[0035] In the formula, d is the duty cycle of the switch tube, that is, t on / (T s / 2), n 1 for N S1 / N P1 , n 2 for N S2 / N P2 . Among them, t on is the on-time, T s is the switching period.

[0036] Put d=1, U in(min) =20V into formula (1), it can be calculated, n=n 1 +n 2 =19, consider...

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Abstract

The invention discloses a parallel-series combination isolated converter transformer ratio design method, a parallel-series combination isolated converter of the invention comprises an input power, two isolated switching circuits and an LC filter. The two isolated switching circuits adopt an input-parallel output-series connection way. The converter can work in two-level working mode and three-level working mode. According to the invention, the voltage stress of a rectifier diode is reduced; the two-level working mode makes an isolated switching circuit with less transformation ratio work in a pulse width modulation control mode, and volume and weight of output filter inductance can be reduced. The design method can be applied to a plurality of isolated switching circuits parallel-series occasions.

Description

technical field [0001] The invention relates to a method for designing the transformation ratio of a transformer, in particular to a method for designing the transformation ratio of a parallel-series combined isolation converter. Background technique [0002] In recent years, with the increasing of fossil energy and environmental pollution, the development and application of renewable energy has attracted widespread attention from all over the world. In a distributed power generation system, since the output of renewable energy such as solar energy and fuel cells is DC and has a wide range of changes, such as 20-70V, a direct-to-direct converter suitable for low-voltage and wide-range input is required as the front stage of the grid-connected inverter , the pre-stage output is usually 380V. To achieve galvanic isolation and high gain, DC-to-DC converters for low voltage wide input usually include isolation transformers. Parallel-series combined isolated converter is a comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33553
Inventor 姚志垒徐静吴素芹彭思敏陈冲李小凡
Owner 忱芯科技(上海)有限公司