Direct current switching power supply parallel system current sharing control method and control device
A switching power supply and flow control technology, which can be used in parallel operation of DC power supply, conversion of DC power input to DC power output, control/regulation system, etc. It can solve problems such as limiting the overall performance of DC power supply.
Inactive Publication Date: 2012-05-09
LUOYANG INST OF SCI & TECH
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Problems solved by technology
The shortcomings of various existing current sharing control methods limit the overall performance of DC power supplies in parallel operation. With the continuous increase of DC power supply power, it is urgent to improve or propose new current sharing control circuits with more ideal current sharing effects. method
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[0044] combine image 3 As shown, there are n switching power supply modules (basic units) running in parallel, which are respectively basic unit 1 to basic unit n; all basic units are connected together through the extreme current selection circuit.
[0045] In terms of hardware circuit structure, it includes: switching power supply module main circuit, current detection circuit, sum value controller, current sharing controller, operation / fault indication circuit, extreme current selection circuit.
[0046] Main circuit of switching power supply module: the main circuit of switching power supply module can adopt various existing DC switching power supply circuits; including direct DC-DC conversion circuit and indirect DC-DC conversion circuit.
[0047] Current detection circuit: the current detection circuit is composed of a current sensor CT1; the current sensor can use various current sensors, preferably a Hall-type current sensor, and the current signal can be converted in...
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The invention relates to the technical field of switching power supply and discloses a direct current switching power supply parallel system current sharing control method and a control device. The control device comprises a plurality of switching power supply current sharing modules which are connected in parallel and an extreme current selective circuit, wherein load output terminals of a plurality of switching power supply current sharing modules which are connected in parallel are connected with loads, and the extreme current selective terminals of a plurality of switching power supply current sharing modules which are connected in parallel are connected with the extreme current selective circuit. By applying the direct current switching power supply parallel system current sharing control method and control device disclosed by the invention, a direct current switching power supply parallel system can operate normally under the condition that a basic element is in fault, thus the direct current switching power supply parallel system current sharing control method and control device are applicable to a power supply parallel system with redundant structure, and reliability and safety of the a power supply system and loads are improved; and power supply equipment cost is reduced, the aim of current sharing of the parallel system is realized, regulating frequency of a power supply module of the power supply system is reduced, low-frequency oscillation produced by output current is effectively avoided and dynamic response of the system is further improved while no intelligent controller (CPU) or complex programming technology is adopted.
Description
[0001] technical field [0002] The invention relates to the technical field of switching power supplies, in particular to a method and a control device for current sharing control of a parallel system of DC switching power supplies. Background technique [0003] Beginning in the 1980s, in order to adapt to the load safety considerations of high-power power supply systems, preliminary research on distributed power systems began. In order to improve the reliability of power supply in the traditional power supply system, each load needs to have two sets of identical power supply equipment, which doubles the cost. The distributed power system utilizes new power supply theory and technology, adopts smaller power supply circuits, and combines them into a modular, intelligent high-power power supply system. In the distributed power system, the module power supply is independent and flexible. This design breaks the power limitation, and its capacity can be expanded according to t...
Claims
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Inventor 姬宣德辛伊波李明伟孙学义李春娟段晓明何墉郑玉丽王晓丽曲振峰李婧张新娜黄兵兵
Owner LUOYANG INST OF SCI & TECH