Wireless Power Transfer
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1 Wireless Power Transfer Dr. Tobias Glahn (CST AG)
2 Nearfield Coupling: Inductive Coils Goals: maximum power transfer high energy efficiency range & freedom of movement Topics: Equivalent circuits Matching
3 Wireless Charging Example 15 mm 12mm chip with complex dispersive impedance frequency: MHz (λ = 22.5m) Simulation issue: electrically small with small details frequency domain technique receiver 50 Ω port d (= 10 mm) transmitter 0.2 mm
4 Equivalent Circuit Extraction Why an equivalent circuit model? Fundamental description of geometry Can intuitively understand energy transfer mechanism (inductive vs. capacitive) Quick what-if analyses by circuit simulation Final detailed analysis & design in full-wave 3D simulation tool!
5 Equivalent Circuit Extraction 1. Construct equivalent circuit model topology each coil: self inductance L self capacitance C self resistance R between coils: mutual inductance M mutual capacitance C 21
6 Equivalent Circuit Extraction 2. 3D sim. results estimate main component values Z-parameter phase phases ~ 90º inductive L1 = L2 400 nh M 26 nh k 0.065
7 Equivalent Circuit Extraction 3. optimise equivalent circuit (goal: match 3D results) original optimised original optimised L 400 nh nh M 26 nh 26.1 nh C s pf C pf R Ω
8 Matching No matching = no coupling Matching = coupling
9 Matching No matching = no coupling Matching = coupling
10 Matching Options CST DESIGN STUDIO full circuit simulation tool (including harmonic balance) tight link with 3D EM field results very flexible optimisation and project construction general multiport matching broadband and multiband matching optimisation using real components bidirectional link to CST STUDIO SUITE
11 Matching in Optenni CST DS various matching circuit options
12 Matching in CST DESIGN STUDIO real components (e.g. from Optenni) TOUCHSTONE import or circuit elements (also non-linear) 3D CST MWS model
13 Matching in CST DESIGN STUDIO NB: Impedances! Port 1: 50 Ω Port 2: complex and frequency dependent real components (e.g. from Optenni) TOUCHSTONE import or circuit elements (also non-linear)
14 Matching in CST DESIGN STUDIO input output efficiency = S 21 2 S-parameters Z port1 = 50 Ω Z port2 variable
15 Matching in CST DESIGN STUDIO 1 V input output power = V I AC Task Z port1 = 0 Ω Z port2 variable P out /P in 0.87 P out = 17 mw
16 Matching in CST DESIGN STUDIO 1 V input output power = V I AC Task Z port1 = 50 Ω Z port2 variable P out /P in 0.85 P out = 4 mw
17 Matching in CST DESIGN STUDIO 1V input
18 Coil Separation: 2 to 20 mm matching circuit designed for 10 mm separation
19 Coil Separation matching circuit designed for 2 mm separation
20 Coil Separation System Assembly Modelling: optimise matching circuit for each separation distance matching circuit adjusted for each separation (e.g. Ricketts et al. (2013) or Beh et al. (2013)) sweep distance optimise matching goal: maximise S 21
21 Horizontal Offset & Rotation Lateral offset causes large drop off in coupling x = 0 d = 10 mm x = ±5 mm x = ±10 mm x = 0 axially aligned
22 Horizontal Offset & Rotation Rotation between coils has very small effect d = 10 mm θ 0º < θ < 180º coils axially aligned
23 Horizontal Offset & Rotation Lateral offset causes large drop off in coupling x = 0 d = 2 mm x = ±6 mm x = ±12 mm x = 0 axially aligned
24 Spiral Coil Design H-field magnitude at 2 mm above coil plane 43 mm based on Casanova et al. (2009)
25 Spiral Coil Coupling x = 0 x = ±12 mm x = 0 axially aligned
26 Conclusion Wireless power transfer is a field of active research and an increasing number of commercial applications Simulation is an important tool in designing wireless power transfer systems, both nearfield and farfield CST STUDIO SUITE provides tools for addressing all aspects of design, from circuit to 3D EM to system level
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