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Charger-discharger with equalization function using both convertor and multi-stage voltage doubler rectifier circuit

A technology of voltage doubling rectifier circuit and charger, which is applied in the direction of secondary battery charging/discharging, conversion equipment using Cuk converter, arrangement of multiple synchronous batteries, etc. There are problems such as discharger, to achieve the effect of cost reduction

Inactive Publication Date: 2016-01-13
JAPAN AEROSPACE EXPLORATION AGENCY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is a method of individually supplying charging power to the power storage cells connected in series, so it is necessary to design the current capacity of all the elements constituting the circuit to be large, so there is a tendency for the circuit to be enlarged and costly.
In addition, since it does not have the function of a discharger, it is necessary to prepare a separate discharger

Method used

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  • Charger-discharger with equalization function using both convertor and multi-stage voltage doubler rectifier circuit
  • Charger-discharger with equalization function using both convertor and multi-stage voltage doubler rectifier circuit
  • Charger-discharger with equalization function using both convertor and multi-stage voltage doubler rectifier circuit

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Embodiment 1

[0115] Figure 11 In order to show the circuit diagram of the charging system with balancing function, four series-connected battery cells B1-B4 are connected to the charger according to the first embodiment of the present invention. The charger of the first implementation type is Figure 4d SEPIC converter with Figure 7 The input circuit and multi-stage voltage doubler rectifier circuit are connected. The switching node formed by the junction of capacitor Cet, diode Do, and inductor L2 in the SEPIC converter is connected to a multi-stage voltage doubler rectifier circuit through an input circuit. Output terminals of the SEPIC converter, that is, diodes Do are connected to capacitors Cout1 - Cout4 , and capacitors Cout1 - Cout4 are connected to power storage cells B1 - B4 . Accordingly, the electric storage cells B1-B4 are charged in series by the output voltage of the SEPIC converter. On the other hand, a multi-stage voltage doubler rectifier circuit is connected to each...

Embodiment 2

[0138] A resonant circuit can also be used as the input circuit. For example, in Figure 14 A circuit diagram showing a configuration in which a series resonant circuit is used as an input circuit and a multi-stage voltage doubler rectifier circuit is connected thereto.

[0139] The series resonant circuit is composed of resonant inductance Lr and resonant capacitor Cr, the circuit after the transformer and Figure 7 Same as shown. The switching nodes within the converter generate a square wave voltage V SN Applied between terminals A-B to input sine wave AC voltage to the multi-stage voltage doubler rectifier circuit.

[0140] Figure 15 In order to display the discontinuous current mode (DiscontinuousCurrentMode; DCM) Figure 14 Operating waveforms when the circuit shown is operating. i Lr Indicates the current flowing through the resonant inductor Lr (according to Figure 14 The current flowing in the direction of the arrow is defined as positive), i D(2i－1) Indica...

Embodiment 3

[0162] The embodiments of the charger with balancing function have been described above. The charger is composed of a unidirectional converter that uses the transmission direction of electric power as a single direction, but uses a bidirectional converter to form the charger of the present invention that can transmit power bidirectionally, so the charging and discharging device with a balanced function of the present invention can be obtained. electrical appliances. In one example, the Figure 17 The diode Do in the SEPIC converter included in the configuration is replaced with a switching element, and a bidirectional SEPIC converter is used as the converter, whereby the charge-discharge device of the present invention can be obtained.

[0163] First, use Figure 19 ~ Figure 23b The operation of the bidirectional SEPIC converter will be described. Figure 19 It is a circuit diagram of a bidirectional SEPIC converter that can be obtained by replacing the diodes in the SEPIC ...

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Abstract

The present invention addresses the problem of providing a charger which is capable of performing charging while eliminating variations in the voltages of storage cells and which does not require that at least the circuit part responsible for equalization of the voltages of the storage cells be designed to have a large current capacity, the present invention also addressing the problem of providing a charger-discharger further equipped with a discharging function in such a charger. Provided are a charger and a charger-discharger, comprising a convertor, an input circuit, and a multi-stage voltage doubler rectifier circuit. A voltage equalization function is implemented by connecting an element in the convertor to which a rectangular wave voltage is applied to the multi-stage voltage doubler rectifier circuit via an input circuit, and a charging-discharging function is implemented by connecting the output of the convertor to the multi-stage voltage doubler rectifier circuit.

Description

technical field [0001] The present invention relates to a charge-discharge device, which balances the voltage of each storage unit and charges it in a storage module composed of a plurality of storage units (secondary batteries, electric double-layer capacitors, etc.) connected in series. discharge. Background technique [0002] In order to obtain a predetermined voltage corresponding to the application, electric storage cells such as secondary batteries and electric double-layer capacitors are used by connecting multiple cells in series to form a module. After repeated charging and discharging of the above-mentioned power storage modules, cell voltage variations will occur due to variations in the capacity, internal resistance, ambient temperature, self-discharge, etc. of each cell. In the power storage module where unevenness has occurred, problems such as accelerated deterioration and reduction in usable energy occur. Therefore, when using a plurality of power storage c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42H02J7/02H01G11/00
CPCH01M10/42H01M2010/4271H02M3/005H02M3/156H02M7/103H02J7/0019H02J7/345H02J2207/20Y02B70/10Y02E60/10H02M1/009H02M1/0058H02M1/007H02M3/1557H02J7/00Y02B40/00H01M10/44
Inventor 鹈野将年久木田明夫
Owner JAPAN AEROSPACE EXPLORATION AGENCY
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