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Design of switched capacitor converter-based wireless power transfer using mutual inductance for micropower applications

Akshat Rawat

Akshat Rawat

Department of Electrical Engineering, National Institute of Technology SilcharSilchar, India
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Rawat, Akshat
, 
Sivaprasad Athikkal

Sivaprasad Athikkal

Department of Electrical and Electronics Engineering, Muthoot Institute of Technology and ScienceVarikoli, India
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Athikkal, Sivaprasad
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S Saahithi

S Saahithi

School of Electrical and Electronics Engineering, REVA UniversityBengaluru, India
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Saahithi, S
 und 
Vivekanandan Subburaj

Vivekanandan Subburaj

Department of Electrical Engineering, National Institute of Technology SilcharSilchar, India
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Subburaj, Vivekanandan
  
18. Feb. 2025
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Artikel-Kategorie: Rapid Communication
Online veröffentlicht: 18. Feb. 2025
Eingereicht: 19. Dez. 2024
DOI: https://doi.org/10.2478/ijssis-2025-0004
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© 2025 Akshat Rawat et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1:

WPT using DC–DC Converter Configuration. (A) Generalized block diagram of WPT using SCC network. (B) Proposed block diagram for WPT using SCC. SCC, switched capacitor converter; WPT, wireless power transfer.
WPT using DC–DC Converter Configuration. (A) Generalized block diagram of WPT using SCC network. (B) Proposed block diagram for WPT using SCC. SCC, switched capacitor converter; WPT, wireless power transfer.

Figure 2:

Proposed SCC circuit diagram. SCC, switched capacitor converter.
Proposed SCC circuit diagram. SCC, switched capacitor converter.

Figure 3:

Simulated output of proposed WPT (Buck). (A) The input voltage, the converter's output voltage, and the WPT output. (B) Capacitor voltage C1 and C3. (C) Load change for WPT. WPT, wireless power transfer.
Simulated output of proposed WPT (Buck). (A) The input voltage, the converter's output voltage, and the WPT output. (B) Capacitor voltage C1 and C3. (C) Load change for WPT. WPT, wireless power transfer.

Figure 4:

Simulated results of the proposed system. (A) Boost output voltage. (B) Output voltage with different load resistance. (C) Distance measured of Boost WPT. WPT, wireless power transfer.
Simulated results of the proposed system. (A) Boost output voltage. (B) Output voltage with different load resistance. (C) Distance measured of Boost WPT. WPT, wireless power transfer.

Figure 5:

Experimental prototype for SCC. (A) Switched capacitor converter. (B) Output voltage of proposed converter of ratio 7/8. SCC, switched capacitor converter.
Experimental prototype for SCC. (A) Switched capacitor converter. (B) Output voltage of proposed converter of ratio 7/8. SCC, switched capacitor converter.

Different VRs SCC output and WPT output

Voltage fraction Input voltage SCC output voltage Receiving end voltage
½ 24 V 11.63 V 10.81 V
1/3 24 V 9.72 V 8.98 V
1/4 24 V 5.58 V 4.82 V
1/5 24 V 4.5 V 3.79 V
1/6 24 V 3.56 V 2.73 V
1/7 24 V 2.89 V 1.89 V
1/8 24 V 2.77 V 1.97 V
2/3 24 V 15.66 V 14.79 V
2/5 24 V 8.99 V 8.29 V
2/7 24 V 5.82 V 5.13 V
3/4 24 V 17.65 V 16.88 V
3/5 24 V 13.82 V 13.17 V
3/7 24 V 9.66 V 8.87 V
3/8 24 V 8.77 V 7.97 V
4/5 24 V 18.54 V 17.89 V
4/7 24 V 12.88 V 11.93 V
5/6 24 V 19.88 V 18.93 V
5/7 24 V 16.32 V 15.48 V
5/8 24 V 14.78 V 13.99 V
6/7 24 V 19.41 V 18.46 V
7/8 24 V 20.90 V 19.73 V

Comparison with existing WPT topology

Papers Buck/Boost Topology used Input voltage Output voltage Maximum distance Efficiency (%)
[2] Boost Frequency tracking WPT system based on PLL 30 V 106.8 (effective) 5 cm 70–80
[3] Boost Wireless battery recharging 14 V 10 V–38 V 15 cm <20
[7] Buck WPT (Resonant frequency technique) 24 V 23.5 V 15 cm 90–95
Proposed Buck/boost WPT using PWM SCC 12 V-24 V 1 V–21 V 20 mm 80–85

Simulated output of WPT for different distance

Distance (mm) 5 10 15 18 20
VR 7/8 7/8 7/8 7/8 7/8
Input voltage 24 24 24 24 24
Output voltage 21 21 21 21 21
Load resistance (kOhm) 10 10 10 10 10
Receiving voltage 20.97 20.96 20.93 20.903 20.89
Output power 88.29 µW 87.61 µW 85.84 µW 84.1 µW 83.51 µW

Voltage fraction 7/8

S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12
ϕ1 0 1 1 0 1 0 1 0 0 0 0 0
ϕ2 1 0 1 0 1 0 0 1 0 0 0 0
ϕ3 1 0 1 0 0 1 0 0 0 0 1 0
ϕ4 1 0 0 1 0 0 0 0 1 0 1 0
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