Resonant Energy Carrier Base Active Charge-Balancing Algorithm
Abstract
:1. Introduction
2. Proposed Circuit Configuration and Principle of Operation
2.1. Basic Circuit Structure
- (a).
- This circuit can balance energy from any battery cell-to-cell.
- (b).
- Reduce the balancing time.
- (c).
- As a single LC tank is used, this circuit becomes small and easy to implement.
- (d).
- All switches are operated in zero voltage condition, so this circuit has less power loss.
2.2. Operation Principle
2.2.1. Working Mode I: Cell1 > Cell2
2.2.2. Working Mode II: Cell2 > Cell1
2.3. Circuit Analysis
3. Voltage Balancing Algorithm
Algorithm 1 Proposed Charge Balancing |
1: Initialize the system; |
2: Read the battery cells voltage status; |
3: Check the cells’ status, so whether battery cells are normal or abnormal. |
4: If (battery cells are operating at normal), |
5: go to step2 |
6: else (Battery cell abnormal) |
7: Go to next |
8: Check the condition of the battery cell; |
9: If (cell in the battery is found as overcharged) 10: Execute the condition of the overcharge limit of the battery cell; 11: Go to step 7; |
12: else (a cell in the battery is found as undercharged) |
13: Execute the condition of the undercharge limit of the battery cell and |
14: Start the cell balancing process. |
15: Estimate the voltage of the equivalent cells. |
16: Check the voltage value by IC for discharge balancing. |
17: Execute the cell discharge mode if; the battery cell voltage is classified as overcharged, 18: where voltage is the highest IC reading value of the battery cells. |
19: Control the MOSFET switches by PWM signal to detect battery cells for discharging the overcharged, control the DC-DC resonant converter, and allow the balancing current for discharging. |
20: Check the balancing of discharging cells. |
21: If (equivalent cell is unbalanced && voltage is lower IC reading value of all battery cells) 22: Go to step7 23: else (the cells in the battery balanced) 24: Go to step 2 |
25: Check the cell voltage value for charge balancing. |
26: If (battery cell voltage is classified as an undercharged battery && Voltage is the IC reading state) 27: Execute the charge mode. 28: else Go to step 2. |
29: Control the MOSFET switches by PWM signal to detect battery cell for charging the undercharged, control the DC-DC resonant converter, and allow the balancing current for charging. 30: Check the balancing status of the charging cell. 31: If (corresponding cell is unbalanced && Vvoltage is higher IC reading value) 32: Go to step 7; 33: else (cells in the battery is balanced) 34: Go to step 2; 35: Execute the voltage-balancing process 36: Repeat |
4. Simulation
5. Experiment Result and Discussion
5.1. Implementation
5.2. Experiment Result
5.3. Benchmark
5.4. Discussion
6. Conclusions
Author Contributions
Funding
Conflicts of Interest
Abbreviations
Nomenclature | |
η | Efficiency |
BMS | Battery management system |
C | Capacitor [V] |
C2C | Cell-to-cell |
C2P | Cell-to-pack |
CO | Carbon-mono-oxide |
CO2 | Carbon-di-oxide |
D | Duty cycle |
DC | Direct current |
EV | Electric vehicle |
i | Current [A] |
IC | Intergrade circuit |
ICE | Internal combustion engine |
iL | Inductor current [A] |
L | Inductor [H] |
LC | Resonant tank |
MD | Bi-directional MOSFET |
MS | Single MOSFET |
MOSFET | Metal Oxide Silicon Field Effect Transistor |
OCV | Open circuit voltage |
P2C | Pack-to-cell |
P2P | Pack-to-pack |
PWM | Pulse-width modulation |
Rds | Internal drain to source resistance in the MOSFET [Ω] |
Req1 | LC tank charging state equivalent resistance [Ω] |
Req2 | LC tank discharging state equivalent resistance [Ω] |
SOC | State of charge |
t | Time [s] |
t0 | Initial time [s] |
T | Switching time [s] |
Vc | Resonant capacitor voltage [V] |
VCell | Battery cell voltage [V] |
Appendix A
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Part | Part Name | Value |
---|---|---|
Single switches (MS) | nMOSFET | IRF450A |
Bidirectional Switches (MD) | nMOSFET | IRF8721 |
Gate driver | Optocoupler | 817c |
Logic gate | SN7404 | |
Resonant tank | Inductor | 100 μH |
capacitor | 222 μH | |
Microcontroller | Arduino Uno | atmega328p |
Monitoring IC | - | Different amplifier |
Battery | Li-ion - Lade-acid | 4200 mAh, 3.7 V (Ultra Fire BRC 18650) 12 V, 1.2 Ah (Battery mart) |
Type Parameter | Boost Converter [15,36] | Buck-Boost Converter [37] | Fly-Back Converter [46] | Ramp Converter [15,40] | Cuk Converter [34] | Resonant Converter [41,42] | Proposed Converter |
---|---|---|---|---|---|---|---|
Switch’s | n + 1 | 2n | 2n + 6 | n | n | 2n | 2n − 2 |
Diode | 0 | 0 | 2 | n | 0 | 1 | 0 |
Inductor | 2n − 2 | N − 1 | 0 | N − 2 | n | 1 | 1 |
Capacitor | N − 1 | 0 | 2 | n | N − 1 | 1 | 1 |
Transformer | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
Power loss * | 1.9% ύ | 22% ύ | 7.2% | 9% | 6.2% | 13.6% [41] 3.6% [42] | 4.9% |
Efficiency | 98% | 82.5% | 92% | 87.4% [40] | - | 78.9% [41] 96% [42] ύ | 94.8% |
Type Parameter | Buck Boost Converter [39] | Fly-Back Converter [44] | Cuk Converter [33] | Quasi-Resonant Converter [36] | LC Matrix Converter [21] | Resonant Converter [42] | Proposed Converter |
---|---|---|---|---|---|---|---|
Battery/SC Rating | 4.0 Ah Batteries | 2.65 Ah Batteries | 10.0 Ah Batteries | 6.2 Ah Batteries | 6.2 Ah Batteries | 300 F SC | 4.2 Ah Batteries |
Initial voltage Difference (mV) | 560 | 250 | 1000 | 620 | 500 | 527 | 246 |
Final voltage gap (mV) | 0 | 25 | 0 | 80 | 4.5 | 10 | 0 |
Balancing time (s) | 2700 | 5500 | 4500 | 6800 | 3500 | 900 | 4680 |
Normalized voltage balancing time (s/j) | 20.1 | 15.4 | 7.5 | 20.3 | 12.3 | 11.2 | 13.8 |
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Hasan, M.K.; Habib, A.A.; Islam, S.; Ghani, A.T.A.; Hossain, E. Resonant Energy Carrier Base Active Charge-Balancing Algorithm. Electronics 2020, 9, 2166. https://doi.org/10.3390/electronics9122166
Hasan MK, Habib AA, Islam S, Ghani ATA, Hossain E. Resonant Energy Carrier Base Active Charge-Balancing Algorithm. Electronics. 2020; 9(12):2166. https://doi.org/10.3390/electronics9122166
Chicago/Turabian StyleHasan, Mohammad Kamrul, AKM Ahasan Habib, Shayla Islam, Ahmad Tarmizi Abdul Ghani, and Eklas Hossain. 2020. "Resonant Energy Carrier Base Active Charge-Balancing Algorithm" Electronics 9, no. 12: 2166. https://doi.org/10.3390/electronics9122166
APA StyleHasan, M. K., Habib, A. A., Islam, S., Ghani, A. T. A., & Hossain, E. (2020). Resonant Energy Carrier Base Active Charge-Balancing Algorithm. Electronics, 9(12), 2166. https://doi.org/10.3390/electronics9122166