Maximum Peak Detection and Auto-Tuning Control Circuit for MCR-WPT Coils

Maximum Peak Detection and Auto-Tuning Control Circuit Prototype Layout

Here we give a brief overview of the Design and simulation results of the Maximum Peak Detection and Auto-Tuning Control Circuit for MCR-WPT Coils.

Below is a list of all the topics we cover in this page. Go ahead and click on any of these links, and you’ll be taken to that specific section.

MCR-WPT Coils suffer from reduced efficiency when their separation distance is less than the optimal distance for peak transfer efficiency, due to a phenomenon known as frequency splitting. For more information about this efficiency problem that the Maximum Peak Detection and Auto-Tuning Control Circuit is designed to overcome, click on button on the right to find out more.

Background and purpose

Control Sytem flow chart

Maximum Peak Detection and Auto-Tuning Flow Control System Chart
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Maximum Peak Detection System

Double layer MCR-WPT coils layout design example

Our Maximum Peak Detection system is comprised of 3 main circuit blocks, namely:

  • A Negative Voltage Level Shifter,
  • A Half Wave Rectifier,
  • A Comparator.

There are a few key factors that needed to be considered when designing each circuit block of the Maximum Peak Detection system.

For a brief overview of these key design factors for each circuit block, click on the respective button to find out more.

Negative Voltage Shifter
Half Wave Rectifier
Comparator

When we combine these circuit block together, we are able to detect the maximum tuning peak output voltage of the MCR-WPT Coils, and thereby improve power transmission efficiency. A description of its operation and tuning range can be retrieved by clicking on the button below.

How Maximum Tuning Peak Is Detected
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Auto-Tuning System Using discrete Varactor

Double layer MCR-WPT Coils design example 3D model in EMPro

The Auto-Tuning system is comprised of 3 main circuit blocks, namely:

  • An AND Gate,
  • A Counter,
  • A Digitally Tuned Capacitance.

There are a some key factors that need to be considered when designing each circuit block of the Maximum Peak Detection system.

For a brief overview of these key design factors for each circuit block, click on the respective button to find out more.

AND Gate
Counter
Digitally Tuned Capacitance
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Maximum Peak Detection and Auto-tuning design

Double layer MCR-WPT Coils design example 3D model in EMPro

For an overview of the devices used in the simulation design, some simulation results, and to view a preliminary prototype layout, click on the respective button to find out more.

Design Device List & Prototype Layout

MCR-WPT Coil for Cellphones Auto-Tuning Simulation Results

Maximum Peak Detection and Auto-tuning Simulation output power results plots: (A) 0.5 inch separation distance; (B) 1.0 inch separation distance

Tuning time, tuning capacitance and bridge rectifier output power at different distances before tuning and at maximum efficiency.

MCR-WPT Coil Design Separation Distance Output Power Before Tuning Peak Output Power Tuning Capacitance Output Power Increase Tuning time

5in x 2.5in

0.5In

1.388W

4.725W

3100pF

240%

1.033ms

1.0In

5.38W

8.002W

1200pF

49%

0.295ms
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