Analysis and Implementation of Inverter Wide-Range Soft Switching in WPT System Based on Class E Inverter
Abstract
:1. Introduction
2. Analysis of the Operating Characteristics of the System
2.1. Parameter Design Method of the Class E Inverter
- (1)
- (2)
- The choke is purely inductive, the inductance value is sufficiently large, the input current is approximately constant DC, no ripple.
- (3)
- The parasitic capacitance of the switch is linear and incorporated into the parallel capacitance.
- (4)
- The time required for the switch turn ON and OFF is idealized to zero, and the conduction impedance is ignored.
- (5)
- The quality factor Q of the series resonant circuit is large enough, and the output waveform is approximately ideal sinusoidal.
2.2. Influence of Inverter Side Parameters on the Soft-Switching Waveform
2.3. Effect of the Coupling Coefficient on Load Characteristics
3. Design and Analysis of the Self/Mutual Inductance Adjusting Coil
3.1. Influence of Self/Mutual Inductance Change on Load Characteristics
- (1)
- When Req is too large, the soft-switching margin can be increased by adjusting C0 and L1.
- (2)
- Similarly, when the switch is in the hard-switching state, reducing the coupling coefficient k between the source coils of the WPT system can reduce the Req and achieve the soft switching.
- (1)
- The direction of the magnetic field of the adjusted coil is reversed, and the coupling coefficient k changes accordingly.
- (2)
- Due to the change of the magnetic field direction of the coil, the self-inductance L1 of the transmitting coil is affected by the change of the self-inductance between the sub-coils.
3.2. Analysis of the Multi-Coil Series Theory Model
3.3. Actual Coil Design
4. Simulation and Experimental Results
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Parameter | Udc | C0 | L1 | C1 | LX |
---|---|---|---|---|---|
Equation |
Mode | A | B | ΔM |
---|---|---|---|
1 | S1-S8 | ||
2 | S1-S8 | ||
3 | S5-S8 | S1-S4 | |
4 | S1-S4 | S5-S8 |
Modes | Effective Coupling Coefficient | Equivalent Load | Compensation Range |
---|---|---|---|
Mode 2 | 0.78k | 0.61Req | 2.5Ropt < Req < 3.3Ropt |
Mode 3 | 0.90k | 0.81Req | Ropt < Req < 1.8Ropt |
Mode 4 | 0.81k | 0.66Req | 1.8Ropt < 2.5Ropt |
Parameter/Unit | Value | Parameter/Unit | Value |
---|---|---|---|
Udc/V | 15 | LD/μH | 71.68 |
f/kHz | 100 | r1,r2/Ω | 0.47/0.21 |
C0/nF | 29.30 | C1/nF | 17.30 |
C01/nF | 20.13 | L2/μH | 8.415 |
LA/μH | 95.60 | C2/nF | 301.1 |
LB/μH | 9.56 | Ropt/Ω | 10 |
LC/μH | 4.78 | Rload/Ω | 5.017 |
Type | Reference [16] | Reference [17] | Proposed Self/Mutual inductance Compensation Method |
---|---|---|---|
Effect | Compatibility range of load network parameter deviation has been improved | ||
Method | Reduce loaded quality factor and magnetic integration | Add saturated reactor | Self/mutual inductance compensation of transmitting coil |
Control parameters | None | Reactance value of saturated reactor | Resonant inductance L1 and coupling coefficient k |
Pros and cons | 1. Complex circuit structure 2. High cost 3. No need to control | 1. Complex circuit structure 2. Need for additional devices and controls | 1. Simple circuit structure 2. No need for additional compensation components 3. Simple control |
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Zhang, S.; Zhao, J.; Wu, Y.; Mao, L.; Xu, J.; Chen, J. Analysis and Implementation of Inverter Wide-Range Soft Switching in WPT System Based on Class E Inverter. Energies 2020, 13, 5187. https://doi.org/10.3390/en13195187
Zhang S, Zhao J, Wu Y, Mao L, Xu J, Chen J. Analysis and Implementation of Inverter Wide-Range Soft Switching in WPT System Based on Class E Inverter. Energies. 2020; 13(19):5187. https://doi.org/10.3390/en13195187
Chicago/Turabian StyleZhang, Shaoteng, Jinbin Zhao, Yuebao Wu, Ling Mao, Jiongyuan Xu, and Jiajun Chen. 2020. "Analysis and Implementation of Inverter Wide-Range Soft Switching in WPT System Based on Class E Inverter" Energies 13, no. 19: 5187. https://doi.org/10.3390/en13195187