Transmission Coil Pulse-Width Phase Demodulation Circuit
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Solution Overview
Problem
Wireless power systems face challenges in phase demodulation due to the need for digital phase measurement circuitry and limited LC tank voltage monitoring windows, as well as restricted input voltage ranges for analog-to-digital converters, which complicate efficient data transmission and power transfer.
Innovation Solution
A circuit and method that measure the voltage of a transmission coil to generate a pulse signal with varying pulse widths, allowing for phase demodulation without requiring additional digital circuitry, by using an integrated circuit to send the pulse signal to a controller for processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital phase measurement circuitry is used for phase demodulation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex digital phase measurement circuitry with an analog pulse width modulation-based phase demodulation system. The phase information is extracted by measuring pulse widths generated from the AC voltage signal, eliminating the need for sophisticated digital counting circuits and ADCs while maintaining measurement precision.
Solution Approach 2:
The patent transforms the phase measurement problem from a digital domain task to an analog domain task by converting phase information into pulse width variations. This parameter transformation allows simple analog circuits to achieve precise phase demodulation without requiring complex digital processing.
2Measurement precision
If analog-to-digital converters with wide input voltage ranges are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent eliminates the need for analog-to-digital converters by performing phase demodulation entirely in the analog domain using pulse width measurement. This substitution removes the complexity and cost associated with ADCs while preserving measurement precision through direct analog signal processing.
3Device complexity
If limited LC tank voltage monitoring windows are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent uses periodic pulse generation synchronized with the AC voltage signal to capture phase information. By generating pulses at regular intervals and measuring their widths, the system achieves precise phase detection within limited monitoring windows without requiring complex continuous monitoring circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simple and efficient phase demodulation by decoding pulse widths, reducing the need for complex digital counting and accommodating limited ADC ranges, thus enhancing data transmission and power transfer reliability in wireless power systems.
Implementation Method 1
the transmission coil and the receiver coil can be inductively coupled with one another to form a transformer that can facilitate inductive transfer of alternating current (AC) power
Data Source
AI summary
Systems and methods for phase demodulation is described. A wireless power transmitter can include a controller, a transmission coil, and an integrated circuit connected to the controller and the transmission coil. The integrated circuit can be configured to measure a voltage of a transmission coil of a wireless power transmitter. The integrated circuit can be further configured to generate, based on the measured voltage, a pulse signal comprising a plurality of pulses. The integrated circuit can be further configured to send the pulse signal to the controller of the wireless power transmitter. The controller can be configured to perform phase demodulation using the pulse signal.