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Device and method for prolonging service life of series direct current power supply unit groups

A technology of DC power supply and power supply unit, applied in the direction of DC network circuit devices, circuit devices, electrical components, etc., which can solve the problems of increased volume, high cost, and large volume of battery packs, and achieve extended service life, performance, and device volume small effect

Inactive Publication Date: 2009-10-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can improve the performance of the notebook battery, but because of the storage of redundant batteries, the volume of the battery pack will increase. The more redundant batteries, the larger the volume and the higher the cost

Method used

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  • Device and method for prolonging service life of series direct current power supply unit groups
  • Device and method for prolonging service life of series direct current power supply unit groups
  • Device and method for prolonging service life of series direct current power supply unit groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: figure 1 A device for prolonging the service life of a series DC power supply unit group is given. The corresponding series DC power supply unit group consists of four lithium batteries (B 1 , B 2 , B 3 , B 4 ) are formed in series in sequence, and the power electronic conversion circuit used for the substitution operation is a single-input and four-output bidirectional flyback converter, and the bidirectional flyback converter is a DC / DC converter.

[0022] The terminal with the same name of the high voltage side winding of this bidirectional flyback converter is connected to battery B 1 connected to the positive pole, and the other end is connected to the switch tube S 1 The drain is connected to the switch tube S 1 source of battery B with 4 A sampling resistor Rs is connected in series between the negative poles, so that the current value flowing through the high voltage side can be sampled. The sampling resistor Rs is used for current sampling, an...

Embodiment 2

[0031] Example 2: Figure 4 Another device for prolonging the service life of a series DC power supply unit group is given. The corresponding series series DC power supply unit group consists of four lithium batteries (B 1 , B 2 , B 3 , B 4 ) are formed in series in sequence, and the power electronic conversion circuit used for the alternative operation is a bidirectional flyback converter with single input and single output. It is connected to each battery through a switch network.

[0032] The design of the high-voltage side of the bidirectional flyback converter is the same as in Embodiment 1; o2 connected to the drain, S o2 The source is connected to the capacitor C o1 The negative plate of the bidirectional flyback converter, the other end of the low-voltage side winding is directly connected to the capacitor C o1 positive plate. Capacitance C o1 in parallel with the switching network. The connection of the switch network is as follows:

[0033] Switch tube S ...

Embodiment 3

[0039] Example 3: Figure 5 Another device for prolonging the service life of a series DC power supply unit group is given. The corresponding series series DC power supply unit group consists of four lithium batteries (B 1 , B 2 , B 3 , B 4 ) are formed in series in sequence, and the power electronic conversion circuit used for the replacement operation is a 4-way single-input and single-output bidirectional flyback converter, and the low-voltage side winding of each bidirectional flyback converter is respectively connected to one of the batteries. details as follows:

[0040] 4-way single-input single-output bidirectional flyback converter Figure 5 The sequence is numbered I, II, III, IV from top to bottom. The terminal with the same name of the high-voltage side winding of the I-way bidirectional flyback converter is connected to the battery B 1 The positive pole of the high-voltage side winding is connected to the other end of the switching tube S m1 The drain is co...

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PUM

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Abstract

The invention discloses a device for prolonging service life of series direct current power supply unit groups, which comprises an electric power electronic conversion circuit, a control circuit and adrive circuit, wherein the high voltage side of the electric power electronic conversion circuit is connected with both ends of the direct current power supply unit group or an external direct current or alternate current power supply, the low voltage side of the electric power electronic conversion circuit is connected with a control switch group which is connected with each power supply unit inthe power supply unit group; and the control circuit is connected with the drive circuit which provides drive signals for the control switch group. The invention also provides a method for prolongingthe service life of the series direct current power supply unit group by utilizing the device. By sampling and comparing the direct current power supply unit group, the control circuit adopts the electric power electronic conversion circuit to replace fault power supply units when fault power supply units are found. By adopting the device and the method, the invention can greatly prolong the service life of the series direct current power supply unit group.

Description

technical field [0001] The invention relates to the technical field of protection of series DC power supply unit groups, in particular to a device and method capable of replacing faulty units in the series series DC power supply unit group to prolong the service life of the entire series series group. Background technique [0002] Generally, the terminal voltage provided by a single DC power supply unit is relatively low, which cannot meet the needs of practical applications in most cases. Therefore, in many cases, multiple DC power supply units need to be connected in series to meet the requirements of use. Due to the differences between DC power supply units connected in series, the service life of each unit is also different. When a power supply unit in the series DC power supply unit group fails, the performance of the entire series series group will be degraded or even scrapped. It can be understood in this way: the failure of most series DC power supply unit groups is...

Claims

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Application Information

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IPC IPC(8): H02J1/00
Inventor 杜韦静张帆张军明钱照明
Owner ZHEJIANG UNIV