Apparatus and method for electric voltage equalization of accumulator units connected in series

A series connection and voltage equalization technology, which is applied to circuit devices, battery circuit devices, current collectors, etc., can solve the problems of reduced reliability, increased device size, and increased cost.

Inactive Publication Date: 2009-02-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

[0004] The disadvantage of the above-mentioned voltage equalization device is that the device must monitor the voltage of each monomer in real time when it is working, and control the switching network to switch the balanced power supply to the corre

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  • Apparatus and method for electric voltage equalization of accumulator units connected in series
  • Apparatus and method for electric voltage equalization of accumulator units connected in series
  • Apparatus and method for electric voltage equalization of accumulator units connected in series

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Embodiment Construction

[0018] FIG. 3 shows a schematic block diagram of a device according to the invention for voltage equalization of energy stores connected in series. The voltage equalization device includes a DC / AC converter 31 and a plurality of voltage equalization branches 32, and the number of the voltage equalization branches 32 is equal to the number of energy storage units. The terminal voltage of the energy storage is inverted in the DC / AC converter 31, and the inverted AC voltage is passed through a plurality of transformers to the AC / DC rectifier, which converts the AC voltage into a DC voltage and applies to each accumulator cell, whereby energy is drawn from said accumulator and delivered to the accumulator cell with a lower terminal voltage.

[0019] FIG. 4 shows an embodiment of a device according to the invention for voltage equalization of energy stores connected in series. The device includes: a DC / AC converter 31, composed of a first voltage dividing capacitor C a , the seco...

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Abstract

Provided is an apparatus and method for equalizing voltage of accumulator units connected in series. The voltage equalizing apparatus includes a DC/AC converter (31), a current-limiting inductance (33); and N voltage-equalizing branch paths (32), wherein N is natural number. The current-limiting inductance of the equalizing apparatus can be distributed into each voltage equalizing branch path and be replaced by an equivalent leakage inductance, or by means of connecting a separate inductance on the prime side of the transformer. The voltage equalizing apparatus absorbs energy from the accumulator and transfers to the accumulator unit with lower voltage in the accumulator, thus the balance of the voltage of each accumulator unit. The invention is characterized in that the circuit structure and the control method is simple, the switch tube may realize soft switching, the converter volume is small, and autonomous democratic voltage equalizing of the accumulator is implemented.

Description

technical field [0001] The present invention proposes a device and method for voltage balancing of energy storage units connected in series, which belongs to a device and method for voltage balancing of energy storage devices, especially a device and method for voltage balancing of supercapacitors and storage batteries connected in series . Background technique [0002] Supercapacitors are also called electric double-layer capacitors or electrochemical capacitors, which have excellent pulse charge and discharge performance and large-capacity energy storage performance. Systems, electric locomotive regenerative braking systems and other applications have received extensive attention from scientific researchers. The voltage of a single supercapacitor is low, and multiple supercapacitors need to be combined in series in practical applications. Due to the limitation of materials and manufacturing level, the parameters of supercapacitors have certain dispersion, which leads to ...

Claims

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Application Information

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IPC IPC(8): H02J15/00H02J7/00H02J7/04
Inventor 谢少军许爱国刘小宝
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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