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STWBC-EP

STWBC-EP system architecture

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STWBC-EP system architecture

Figure 2 illustrates the overall system blocks implemented in the STWBC-EP architecture.

The STWBC-EP is a flexible controller that supports a half bridge coil driver together with

a DC/DC controller, which regulates the input voltage of the bridge in order to control the

amount of the power transmitter to the receiver.

The digital controller also regulates the half bridge operating frequency and duty cycle to

further adjust the amount of power increasing the overall efficiency at the light load.

It implements the WPC 1.2 protocol, including foreign object detection (FOD) extensions. An

accurate Q-factor measurement provides enhanced FOD.

The STWBC-EP is able to manage both WPC Baseline Power Profile (up to 5 W) and

Extended Power Profile (EPP).

Figure 2. STWBC-EP device architecture

Firmware

The STWBC-EP firmware is available in a turnkey software package distributed as a binary

file.

The STWBC-EP provides UART communication interface, for external programming of

parameters and STWBC-EP control.