Single Switched Capacitor Battery Balancing
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Transcript of Single Switched Capacitor Battery Balancing
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Single Switched Capacitor Battery
Balancing
System Enhancements
Mohamed Daowd, Mailier Antoine,
Noshin Omar, Peter van den Bosscheand Joeri van Mierlo
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Double-Tiered Switched
Capacitor(DTSC)
n capacitors
2n bi-directional
switches
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Single switched capacitor(SSC)
single capacitor
n + 5
bi-directional
switches
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Modularized switched capacitor (MSC)
n 1 capacitor low
voltage
1 capacitor high voltage
2n + 4
bi-directional switches
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Figure 6. Switched capacitor balancing simulation
results
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Figure 7. Double-tiered switched capacitor simulation
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Figure 8. Single switched capacitor balancing simulation
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Single Switched Capacitor Control
Strategy
More efficient control strategy, reducing the
capacitor size, the system cost, and the
balancing time
Maximize the shuttling energy transfers
between the cells, and minimizing the
capacitor size and the balancing time
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Factors
Capacitor value (C)
Switching frequency (F)
Series equivalent resistance (Rseq) Voltage difference between the unbalanced
cells (Vdiff)
The duty cycle, on-period, (D)
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SSC Strategy Proceeding
1. Extracting the function of the transferred energy between the cells and
the capacitor.
2. Selecting the optimal capacitor value (minimum) by maximizing the
energy function with respect to the capacitor value at different switching
frequencies. The transferred energy will be a function of (C, F), with any
arbitrary Vdiff and D because the latter two parameters will vary during
balancing periods. 3. Maximizing the energy transfer with the calculated C and RSeq values as
a function of (F, D) at different values of Vdiff.
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SSC Strategy Proceeding
4. Dividing the balancing period into zones according
to voltage difference Vdiff, and decide the required
maximum current allowed through the capacitor and
the corresponding equivalent resistor RSeq value 5. By knowing the higher and lower cell voltage,
applying the corresponding F and D along the
balancing time according to the cell voltages to get
the maximum energy transfer
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Proposed SSC Balancing Simulation
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Experimental results
3.288 and 3.212 V (Vdiff. = 76 mV)
SoCs =35% and 11.3%(difference is 23.7%)
SoC summation was 46.3%