DC (direct-current) converter voltage-sharing technology with multiple modules having series inputs and parallel outputs

A DC converter and series output technology, which is applied in the direction of DC power input conversion to DC power output, output power conversion devices, instruments, etc., to achieve the effect of simple circuit and easy implementation

Inactive Publication Date: 2011-10-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The present invention proposes a new control mode to solve the voltage

Method used

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  • DC (direct-current) converter voltage-sharing technology with multiple modules having series inputs and parallel outputs
  • DC (direct-current) converter voltage-sharing technology with multiple modules having series inputs and parallel outputs
  • DC (direct-current) converter voltage-sharing technology with multiple modules having series inputs and parallel outputs

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Embodiment Construction

[0012] figure 1 It is a schematic diagram of the control of the input series output parallel multi-module DC converter system, in which modules 1 to n are n separate identical DC converter modules, and the input terminals of modules 1 to n are respectively connected to their respective input capacitors C 1 to C n Parallel connection, the output terminals of each module are connected in parallel to form an input series output parallel multi-module DC converter system. The control method adopts a double-loop control scheme. The output voltage sampling and output voltage reference pass through the voltage regulator, and then the output total current sampling is adjusted by the current regulator and then enters the controller to generate driving signals. The same driving signal is used to drive each module after isolation. Each module adopts the same duty cycle control.

[0013] Specific implementation methods such as figure 2 Shown: output reference voltage u ref Connected t...

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Abstract

With the fast development of power electronic technologies, the development of power electronic system integration techniques becomes a tendency. In application situations of high-voltage input and large-current output, a DC (direct-current) converter system with multiple modules having series inputs and parallel outputs can be used widely. The key problem of the DC (direct-current) converter system with multiple modules having series inputs and parallel outputs is to ensure voltage sharing of input ends of all modules in the system. For the purpose of realizing the voltage sharing, a voltage loop, a current loop and a voltage-sharing ring are traditionally used to control, each module is required to input voltage detection signals, the circuit is complicated and the control difficulty is high. The invention provides a voltage-sharing technology among modules at input ends, thus realizing the voltage sharing of the multiple modules at the input ends. The control characteristics are as follows: a voltage-current dual-loop control method is adopted, voltage sampling is output voltage sampling, current sampling is the total current sampling of the current output of each module, and each module is controlled by the same duty ratio, thus realizing the voltage sharing at the input ends. The circuit is controlled simply and certain redundancy is provided.

Description

technical field [0001] The invention relates to an input series output parallel multi-module DC converter voltage equalization technology, which belongs to the control technology of the DC converter in power conversion. Background technique [0002] At present, DC converters with high voltage input, low voltage and high current output are widely used in electrolytic aluminum, rail transit and other industries. When a single module structure is adopted, the power tube of the main circuit needs to use a high-voltage switching tube or multiple tubes in series. When the high-voltage power tube is selected, the cost of the whole machine is high, and the multi-tube series connection technology is complicated and only a few companies have mastered it. Therefore, in the case of high-voltage input, the way of multi-module series connection is often used. In order to improve the efficiency and reliability of the converter, there are many studies on the topology and control methods of...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 朱琦周峰王慧贞龚春英肖岚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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