EVA II
Evaluation tool for development of WPT designs up to 240 W
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AN EVALUATION PLATFORM FOR DESIGNERS OF WPT SYSTEMS
IN THE LAPTOP APPLICATION AREA
The EVA II is an evaluation platform for WPT systems up to 240 W, developed to support the WPC Medium Power specification and Mobile Laptop Task Force specification.
The EVA II system consist of a high-power rectifier, a high-power inverter and a variety of resonant tanks. Together with additional external equipment they create an evaluation platform for designers of WPT systems in the laptop application area. It is an ideal tool kit for rapid prototyping and comparison of different WPT designs during the development of the final specification and compliance program. As a reference, EVA II allows for reliable comparison of different designs or prototypes.
Developers of either transmitter or receiver designs can utilize EVA II for evaluation of their design, without the need to develop counterpart products themselves. A company developing transmitters for Medium Power (or MLTF) applications can use the EVA II Rectifier and EVA II resonant tanks to evaluate the coupling, losses and operating points of their transmitter design. Equally for developments of Laptops or other medium power receivers, EVA II Inverter in combination with EVA II resonant tanks allow for evaluation and benchmark of the receiver module and coupling with different transmitter designs. Similarly a coil designer can utilize either the EVA II Rectifier or EVA II Inverter by connecting their own coils to the system, enabling full first hand evaluation of different designs in a realistic use case scenario.
EVA II units can be used either with external equipment such as oscilloscope, wave-form generator and electronic load (as in picture above), or with EVA I control units (as in pictures below), customized to the use case of early stage prototype developement.
EVA II Rectifier used with EVA I BST Control Unit for measurments on power class 1 PTx prototype (laptop charger)
EVA II Inverter used with EVA I MDT Control Unit for measurements on power class 1 PRx prototype (laptop)
SYSTEM OVERVIEWS
EVA II INVERTER
EVA II RECTIFIER
TECHNICAL SPECIFICATIONS
EVA II RECTIFIER
Operating limits:
- VDC < 48 V
- IDC < 5 A rms
- 10.0 kHz < f < 250.0 kHz
- PDC < 240 W
Dimensions:
- Width 110 mm
- Height 64 mm
- Length 175 mm
UI
- 3 status LEDs
- Reset button
- Switch for power on/off
Protection against:
- Overvoltage on DC output
- Overcurrent on DC output
- Overtemperature on rectifier diodes
I/O:
- DC output to external load: 4mm plugs (banana)
- AC input from resonant tank: 2-pin terminal block
- DC input (internal power supply): DC-jack
Power supply:
- 12 V DC input
EVA II INVERTER
Operating limits:
- VDC < 48 V
- IDC < 10 A rms
- 10.0 kHz < f < 250.0 kHz
Dimensions:
- Width 110 mm
- Height 64 mm
- Length 175 mm
UI
- 3 status LEDs
- Enable/reset button
- Switch for power on/off
Protection against:
- Overvoltage on DC input
- Overcurrent on DC input
- Capacitive drive of inverter output
- Overcurrent on AC output
I/O:
- DC input to inverter: 4mm plugs (banana)
- AC input to inverter: BNC
- AC output to resonant tank: 2-pin terminal block
- DC input (internal power supply): DC-jack
Power supply:
- 12 V DC input
RESONANT TANKS
Operating limits:
| Resonant tank: | MP-1 | MP-2 | MP-3 |
|---|---|---|---|
| VDC: | 4A rms | 3.5A rms | 3A rms |
| P (typical): | 40 W | 60 W | 90 W |
| Coil diameter: | 50 mm | 60 mm | 70 mm |
| Coil inductance: | 12 +/-1 nH | 18 +/-1 nH | 24 +/-1 nH |
| Rs: | < 130 mOhm | < 175 mOhm | < 250 mOhm |
| fs: | 115 +/- 5 kHz | 120 +/- 5 kHz | 115 +/- 5 kHz |
Dimensions:
- Width 150 mm
- Length 150 mm
- Thickness 26 mm
I/O
- AC input/output to resonant tank: 4-pin terminal block