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Lossless equalization principle a two-way

Two-way non-destructive principle of a balanced vgp-bps2 , vgp-bps2a charge and discharge the program structure as shown in Figure 1, each cell balancing FET shunt circuit are two Q, two diodes D, and an energy storage device composed of inductor L. (B) is a picture out of three when the circuit connecting the battery to link the case. In order to charge, for example, assume that an equilibrium in the two cell voltage circuit that there is no balance, such as VB1> VB2, then the Q11 conduction, the battery B1 to the charge inductor L1, when the Q11 deadline, L1 in order to freewheeling, and B2, D12 constitute a circuit, the vgp-bps2b , vgp-bps2c energy stored in the inductor transferred to B2, the realization of the energy transfer from B1 to B2.

By the same token when the VB1 < VB2, then through the Q12-off to achieve the energy transfer from B2 to B1, that is, the circuit is a two-way transfer of energy balance device. Although the energy transfer only between adjacent canon bg-e6 battery gri cells, due to the trend of energy transfer is always from the high-voltage battery to pass to the low battery voltage, and thus ultimately the balance of the whole group of batteries. Discharge, principles and canon eos 20d battery grip charging basically the same.

Since all the equilibrium structure of the circuit are the same, so easy to achieve a modular design.

The two-way balanced design of the module

To extend battery life, charge and discharge the inspiron e1405 battery should be to enable all of the individual remain in the same state of charge, while the battery voltage is the battery inconsistency of the most intuitive and most easy to measure the performance of the form, so the ideological balance of charge gist is the charge-discharge process as much as possible to enable the VGP-BPS8, VGP-BPS8A battery to maintain the same level.

Based on the above reasons, this design is used to compare the parameters of voltage, through the MCU control, to achieve a high-voltage battery to transfer energy directly to the battery voltage is low. (Figure 2 omitted)

Among them, a balanced circuit used to implement the VGP-BPS9, VGP-BPS9/B battery between two adjacent energy balance; data acquisition circuit the battery parameters in real-time collection, the main acquisition parameters are the battery terminal voltage and temperature, through the A / D converted to give microcontroller for battery real-time monitoring; microcontroller to monitor battery state and also of the balance control circuit, once voltage difference was found between the battery reached a certain value, that is, to the corresponding FET send trigger pulse to turn-on voltage of the battery to the high inductance charge FET end, the inductor stored energy to supplement VGP-BPS9/S, VGP-BPS9A/B battery charging voltage is low.