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Switching power supply and its control method

A technology of switching power supply and controller, which is applied in the direction of current collectors, electric vehicles, electrical components, etc., and can solve problems such as increased loss, branch failure, and reduced system redundancy

Active Publication Date: 2017-09-15
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: charging and discharging equalization of series battery packs requires an additional balancing topology, which increases losses, and energy is transferred between batteries, reducing the overall efficiency of the system; When any battery in a branch fails, the entire branch will fail, reducing system redundancy
Series battery packs are not suitable for the above occasions where maintainability is not available

Method used

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  • Switching power supply and its control method
  • Switching power supply and its control method
  • Switching power supply and its control method

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Embodiment Construction

[0040] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0041] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0042] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a switching power supply and a control method thereof. By connecting batteries in parallel and connecting corresponding DC-DC converters, a redundancy effect can be formed, thereby avoiding the failure of the entire system due to damage to one battery in a series battery pack. At the same time, by configuring two corresponding control loops for each DC-DC converter, the first control loop controls the DC-DC converter to balance the state of charge when there is a difference in the state of charge of the battery, and the second control loop After the state of charge of the battery is balanced, the DC-DC converter is controlled to perform current sharing, so that the state of charge of the battery of the switching power supply tends to be balanced during operation, prolonging the service life of the battery while maintaining system stability.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a switching power supply and a control method thereof. Background technique [0002] A large number of power battery packs are required in the fields of communication power supply, space power supply, UPS, EPS, and large electric vehicles. At present, power batteries are generally connected in series to meet the voltage and power requirements under different working conditions. The method of using batteries in series has the advantages of high power density and relatively mature technology. Therefore, in order to improve system efficiency and prolong battery life, the equalization method of charge and discharge of series battery packs is a hot research topic at present. [0003] In the prior art, DC-DC topologies such as buck-boost, cuk, and flyback converters are used to implement energy balance strategies, and remarkable results have been achieved. Through the above equalizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02M3/10
Inventor 蔡春伟史春玉孙清洁田光耀郭玉兴陈牛森
Owner HARBIN INST OF TECH AT WEIHAI
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