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VOLTAGE BALANCE CIRCUIT FOR THE ENERGY STORAGE POWER

IP.com Disclosure Number: IPCOM000246584D
Publication Date: 2016-Jun-20
Document File: 4 page(s) / 78K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a voltage balance circuit for energy storage power which pumps energy from higher voltage module and automatically backs it to the lowest voltage module. Every module Cx (x=1, 2……n) of the energy storage power parallels with a unit of voltage balance circuit. Every unit of the balance circuit is constructed by insulated-gate bipolar transistor (IGBTx), where, x=1, 2……n, paralleled with Dx, independent transformer winding Xx, resistor Rx, and diode D1x. All the independent windings co-built on same core, as a transformer. Every winding has same amount turns. Every same polarity winding terminal is connected with the energy storage power module.

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Page 01 of 4

VOLTAGE BALANCE CIRCUIT FOR THE ENERGY STORAGE POWER

BACKGROUND

The present invention generally relates to energy storage power and more particularly to a voltage balance circuit for energy storage power.

Normally, a single charger is used to charge energy storage power constructed with several series modules, such as, ultra capacitor module, lead-acid battery module and so on. Every module has same voltage level. After charging to the energy storage power, every constructed module usually has different voltage. For example, some modules have lower voltage than the module normal voltage, and some have higher, which even exceed the module voltage level limit that subsequently lower energy storage power efficiency, or even result in easy destruction of modules.

Generally, voltage balance circuits are used in order to increase energy storage efficiency and make the modules stay on safety. For example, in a conventional technique, voltage balance circuit pumps energy from the highest voltage module, and back the energy to the overall series modules of the energy storage power. Figure 1 depicts the conventional voltage balance circuit for energy storage power.

Figure 1

In another conventional technique, balance circuit pumps energy from the overall series modules of the energy storage power, and back the energy to the lowest voltage module. Figure 2 depicts the balance circuit as described in the above mentioned conventional technique.


Page 02 of 4

Charger

Load

Controller

Figure 2

One the other conventional technique includes a system that includes paralleling resistor with every constructed module.

However, these voltage balance circuits either waste energy, or have lower balance efficiency and therefore longer balance time.

Therefore there is a need in the art for an improved balance circuit for energy storage power that provides less energy wastage and has longer balance time.

DETAILED DESCRIPTION

The invention proposes a voltage balance circuit for energy storage power which pumps energy from higher voltage module and automatically backs it to the lowest voltage module. This improves module voltage balance efficiency by shorten balance time, make use of the energy storage power capacity, and make every constructed modules stay on safety.

Figure 1 depicts proposed voltage balance circuit for energy storage power.


Page 03 of 4

Figure 3

As illustrated in Figure3 above, every module Cx (x=1, 2……n) of the energy storage power parallels with a unit of voltage balance circuit. Every unit of the balance circuit is constructed by insulated-gate bipolar transistor (IGBTx), where, x=1, 2……n, paralleled with Dx, independent transformer winding Xx, resistor Rx, and diode D1x. All the independent windings co-built on same core, as a transformer. Every winding has same...