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Input-series-output-parallel (ISOP) system having natural voltage sharing characteristic and control method thereof

A control method and natural technology, applied in the ISOP system and its control field, can solve problems such as poor pressure equalization effect, and achieve the effect of simplifying the design method, improving the utilization rate, and improving the pressure equalizing effect and the current equalizing effect.

Inactive Publication Date: 2018-04-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In an actual circuit, parameters such as inductors, capacitors, and transformers are difficult to be completely consistent, so the voltage equalization effect is not good

Method used

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  • Input-series-output-parallel (ISOP) system having natural voltage sharing characteristic and control method thereof
  • Input-series-output-parallel (ISOP) system having natural voltage sharing characteristic and control method thereof
  • Input-series-output-parallel (ISOP) system having natural voltage sharing characteristic and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] figure 1 , figure 2 It is the circuit schematic diagram of the ISOP system composed of n sub-modules and its control method, in which the input side of the Boost converter is connected in series, and the output side of the LLC resonant converter is connected in parallel.

example 2

[0048] The following describes an ISOP system containing two Boost+LLC resonant converter modules as an example:

[0049] The ISOP system of this embodiment includes two Boost+LLC resonant converter modules. The two modules are connected in series at the input side and parallel at the output side. The design parameters of the two LLC resonant converters in the system are the same, and the design parameters of the two Boost converters are the same. Such as image 3 with Figure 4 Shown is an ISOP system with natural pressure and current equalization characteristics and its control method, including the following steps:

[0050] Step S1: Generate a duty cycle signal with a fixed frequency and pulse width through the DSP, and use it to control the LLC resonant converter after passing through the driving circuit. In each LLC resonant converter, the two pairs of switch tubes at diagonal angles are turned on and off at the same time, and the upper and lower tubes of the same bridg...

Embodiment 3

[0070] The second embodiment is based on the above-mentioned ISOP system, and a design method and experimental results of an application example are given below. The instance input voltage V in 1000V~2000V, output voltage V o is 700V, output power P o It is 12kW, and its detailed design steps are as follows:

[0071] 1) Design of Boost boost inductor

[0072] For a single Boost converter, its input voltage V in_bst It is half of the system input voltage, that is, 500V ~ 1000V, and its minimum value is V in_bstmin =500V. Therefore, considering the selection of the switching tube and the efficiency of the converter, the output voltage V of the Boost converter is selected Cb Slightly higher than the maximum input voltage, which is 1200V, the boost inductor is calculated according to the following formula,

[0073]

[0074] Among them, f sb is the switching frequency of the Boost converter, where 10kHz is taken, and P o_bst For the output power of a single Boost conver...

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Abstract

The invention provides an input-series-output-parallel (ISOP) system having natural voltage sharing characteristic and a control method thereof. The system comprises n sub-modules, wherein each sub-module comprises a Boost converter and an LLC resonant converter, n is a natural number larger than or equal to 2, in each sub-module, the Boost converter is a front stage, the LLC resonant converter isa rear stage, an output of the Boost converter is used as an input of the LLC resonant converter, the two converters are connected by an intermediate bus capacitor, input ends of the Boost convertersof the n sub-modules are sequentially connected in series, a positive electrode of an input voltage source is connected with an input positive end of a first Boost converter, a negative electrode ofthe input voltage source is connected with an input negative end of an n(th) Boost converter, and output ends of the LLC resonant converters of the n sub-modules are connected in parallel and are respectively connected with a positive end and a negative end of an output resistor. By the system, no extra measure is needed to be added, input voltage sharing and output current sharing of the ISOP system can be achieved, and the influence of inconsistent parameter among the modules on a voltage sharing and current sharing effect is relatively small. The implement method is simple, and the reliability of the system can be greatly improved.

Description

technical field [0001] The invention relates to the field of high-voltage DC converters, in particular to an ISOP system with natural voltage equalization characteristics and a control method thereof. Background technique [0002] In rail transit, ships and other high-voltage input and low-voltage output medium and high-power occasions, in order to reduce the voltage stress of the switch tube in the converter, multiple converters are often used in series on the input side and parallel on the output side, which is input in series and output in parallel ( Input-Series-Output-Parallel, ISOP) system. The advantages of the ISOP system are: modular design can be realized; the output power of each module is only 1 / n of the total output power of the system (n is the number of modules in the ISOP system), which is beneficial to reduce the design difficulty; The input voltage is 1 / n of the input voltage of the system, so the voltage stress of the switching tube is also reduced to 1 / n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/48H02M3/156
CPCH02M3/156H02M3/33569H02M7/48H02M1/007H02M1/0074H02M7/4815Y02B70/10
Inventor 刘飞周光军阮新波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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