8
4
Functional description
Typically the WPB is permanently supplied with AC, and the WSB is permanently connected to the
battery. Charging can commence when:
The operating frequency for wireless power transfer (WPT) is 160…250 kHz at steady state,
depending on the air-gap, misalignment and output voltage.
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The WPP and WSP are correctly aligned: face-to-face, parallel, and within the specified
misalignment and air gap ranges
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and the charger system is instructed to start charging, either via CAN bus or by the charger
system's ENABLE input
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The charger system does not detect any fault conditions.
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The WPB and WSB are able to communicate with each other.
4.1
Wireless WPB - WSB communication
For internal system communication the WPB and WSB both contain a radio frequency transceiver
module with integral antenna. The transceiver module is IEEE Std. 802.15.4 compliant and has Radio
The transceiver module operates at ISM Band 2.405 to 2.480 GHz, with maximum RF transmit power
as 2.09 dBm. The wireless communication WPB and WSB uses a proprietary protocol and cannot be
accessed by the user.
4.2
Hardware features
4.2.1
WPB
Reset button
Earth stud
To AC socket
To WPP
Thermal expansion vent
Plastic window for WPB/WSB
communication
Status LEDs
4.2.1.1
Reset button
The WPB has a non-latching push button that can be used to restart the charging process.
The charger has been considered for use at an altitude of up to 3000 m, pollution degree
2 environment and overvoltage category II application.
