Article
Wireless Power Converter
Convey 50 watts through the air
In cooperation with Würth Elektronik, in this article we present a pair of modules for high-efficiency wireless power transfer with a maximum capacity of 50 watts over distances up to a few centimeters. This set is available at a special price to enable Elektor community members to try out this highly promising technology.
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
PCB
Extra info / Update
* Maximum power: 50 W
* Recommended continuous power: 0–40 W
* Supply voltage: 12.5–24 VDC / 3 A min.
* Recommended supply voltage: 19.5 V (laptop adapter)
* Distance between coils: 1 cm maximum for optimal power transfer
* Efficiency: 88% at 40 W with 0.5 cm coil separation
* Recommended continuous power: 0–40 W
* Supply voltage: 12.5–24 VDC / 3 A min.
* Recommended supply voltage: 19.5 V (laptop adapter)
* Distance between coils: 1 cm maximum for optimal power transfer
* Efficiency: 88% at 40 W with 0.5 cm coil separation
Component list
Component List
Covers 1 transmitter / receiver board
Resistors
R1,R2,R5,R6,R12 = 4.7kOhm 1%, 0.25W, SMD 1206
R3,R4 = 4.7Ohm 1%, 0.25W, SMD 1206
R7,R8 = 1kOhm, 1 %, 0.25W, SMD 1206
R9 = 100kOhm, 1 %, 0.125W, SMD 0805
R10 = 180kOhm, 1 %, 0.125W, SMD 0805
R11 = 33kOhm, 1 %, 0.125W, SMD 0805
R13 = 11kOhm, 1 %, 0.125W, SMD 0805
R14,R17 = 3kOhm, 1 %, 0.125W, SMD 0805
R15,R16 = 100kOhm, 1 %, 0.25 W, SMD 1206
R18 = 0.022Ohm 5%, 0.5 W, SMD 1206
Capacitors
C1,C18 = 100nF 50V, 10%, X7R, SMD 0805
C2,C3 = 330µF 35V, 20%, 0Ohm15, 10x16 mm, radiaal
C4,C5,C12-C15,C17,C25,C26 = 4.7µF 50V, 10%, X7R, SMD 1210
C6,C7 = 68µF 25V, 0.015Ohm, 8x12 mm, radial, Can - SMD
C8,C9,C10,C11 = 100nF 310 VAC, 10%, polypropylene, 10mm pitch
C16 = 22nF 50V, 10%, X7R, SMD 0805
C19,C20,C24 = 4.7nF 50V, 5%, NP0, SMD 0805
C21,C22,C23,C27 = 22µF 16V, 20%, X5R, SMD 1210
Inductors
L1,L2 = 68µH 20%, 7.5A, 0.0273Ohm, SMD (Würth 74435586800)
L3 = 10µH, 20%, 1.2A, 0.322Ohm, SMD (Würth 74438336100)
L4 (not on PCB) = 24µH 10%, 6A, 0.1Ohm (Würth Wireless Power Charging Coil)
Semiconductors
D1,D2 = BYM12-200, DO-213AB (MELF)
D3,D4,D5 = BYM13-40, DO-213AB (MELF)
D6 = WE-TVSP (15V 1500W), DO-214AB
D7 = LED, blue, SMD 0805
T1,T2,T3,T4 = DZT5551, SMD SOT-223
T5,T6 = FDD86250, SMD TO252
T7,T8,T9,T10 = PBHV9115Z, SMD SOT-223
IC1 = WE_VDRM_Power-Module SMD TO263-7 (Würth type 171032401)
Miscellaneous
K1,K2 = 2-way PCB screw terminal block, 5mm pitch
J1 = 3-pin pinheader, 0.1’’ pitch
F1 = PTC resettable fuse, 0.048Ohm, Ihold 2.5A/30V (MF-R250-0-10)
J1 = jumper, 0.1’’ pitch
PCB # 160119-1
Additional parts on Transmitter Board
R19 = 1kOhm 1%, 0.125W, SMD 0805
R20 = 11kOhm 1%, 0.125W, SMD 0805
R21 = 2.2kOhm, 1%, 0.125W, SMD 0805
R22 = 47kOhm, 1 %, 0.125W, SMD 0805
R23,R25 = 470kOhm, 1 %, 125 mW, SMD 0805
R24 = 1MOhm 1%, 0.125W, SMD 0805
R26 = 33kOhm, 1%, 0.125W, SMD 0805
R27 = 100Ohm 1%, 0.125W, SMD 0805
P1 = 2kOhm 25%, 0.2W, SMD trim pot (e.g. Bourns 3364W-1-202E)
C28 = 10pF 50V, 5%, C0G/NP0, SMD 0805
C29 = 100nF 50V, 10 %, X7R, SMD 0805
D8 = BAT54, SMD SOT-23
T11 = BC850C, SMD SOT-23
T12 = BC860C, SMD SOT-23
IC2 = ZXCT1107SA-7, SMD SOT-23
S1 = pushbutton with make contact, SPST-NO (FSM4JRT)
Kit of parts with all components and boards for 1 transmitter and 1 receiver: Elektor Store # 160119-71
Covers 1 transmitter / receiver board
Resistors
R1,R2,R5,R6,R12 = 4.7kOhm 1%, 0.25W, SMD 1206
R3,R4 = 4.7Ohm 1%, 0.25W, SMD 1206
R7,R8 = 1kOhm, 1 %, 0.25W, SMD 1206
R9 = 100kOhm, 1 %, 0.125W, SMD 0805
R10 = 180kOhm, 1 %, 0.125W, SMD 0805
R11 = 33kOhm, 1 %, 0.125W, SMD 0805
R13 = 11kOhm, 1 %, 0.125W, SMD 0805
R14,R17 = 3kOhm, 1 %, 0.125W, SMD 0805
R15,R16 = 100kOhm, 1 %, 0.25 W, SMD 1206
R18 = 0.022Ohm 5%, 0.5 W, SMD 1206
Capacitors
C1,C18 = 100nF 50V, 10%, X7R, SMD 0805
C2,C3 = 330µF 35V, 20%, 0Ohm15, 10x16 mm, radiaal
C4,C5,C12-C15,C17,C25,C26 = 4.7µF 50V, 10%, X7R, SMD 1210
C6,C7 = 68µF 25V, 0.015Ohm, 8x12 mm, radial, Can - SMD
C8,C9,C10,C11 = 100nF 310 VAC, 10%, polypropylene, 10mm pitch
C16 = 22nF 50V, 10%, X7R, SMD 0805
C19,C20,C24 = 4.7nF 50V, 5%, NP0, SMD 0805
C21,C22,C23,C27 = 22µF 16V, 20%, X5R, SMD 1210
Inductors
L1,L2 = 68µH 20%, 7.5A, 0.0273Ohm, SMD (Würth 74435586800)
L3 = 10µH, 20%, 1.2A, 0.322Ohm, SMD (Würth 74438336100)
L4 (not on PCB) = 24µH 10%, 6A, 0.1Ohm (Würth Wireless Power Charging Coil)
Semiconductors
D1,D2 = BYM12-200, DO-213AB (MELF)
D3,D4,D5 = BYM13-40, DO-213AB (MELF)
D6 = WE-TVSP (15V 1500W), DO-214AB
D7 = LED, blue, SMD 0805
T1,T2,T3,T4 = DZT5551, SMD SOT-223
T5,T6 = FDD86250, SMD TO252
T7,T8,T9,T10 = PBHV9115Z, SMD SOT-223
IC1 = WE_VDRM_Power-Module SMD TO263-7 (Würth type 171032401)
Miscellaneous
K1,K2 = 2-way PCB screw terminal block, 5mm pitch
J1 = 3-pin pinheader, 0.1’’ pitch
F1 = PTC resettable fuse, 0.048Ohm, Ihold 2.5A/30V (MF-R250-0-10)
J1 = jumper, 0.1’’ pitch
PCB # 160119-1
Additional parts on Transmitter Board
R19 = 1kOhm 1%, 0.125W, SMD 0805
R20 = 11kOhm 1%, 0.125W, SMD 0805
R21 = 2.2kOhm, 1%, 0.125W, SMD 0805
R22 = 47kOhm, 1 %, 0.125W, SMD 0805
R23,R25 = 470kOhm, 1 %, 125 mW, SMD 0805
R24 = 1MOhm 1%, 0.125W, SMD 0805
R26 = 33kOhm, 1%, 0.125W, SMD 0805
R27 = 100Ohm 1%, 0.125W, SMD 0805
P1 = 2kOhm 25%, 0.2W, SMD trim pot (e.g. Bourns 3364W-1-202E)
C28 = 10pF 50V, 5%, C0G/NP0, SMD 0805
C29 = 100nF 50V, 10 %, X7R, SMD 0805
D8 = BAT54, SMD SOT-23
T11 = BC850C, SMD SOT-23
T12 = BC860C, SMD SOT-23
IC2 = ZXCT1107SA-7, SMD SOT-23
S1 = pushbutton with make contact, SPST-NO (FSM4JRT)
Kit of parts with all components and boards for 1 transmitter and 1 receiver: Elektor Store # 160119-71
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