Adaptive Transmitter Detection Circuit for Wireless Power
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Solution Overview
Problem
Conventional wireless power systems face inefficiencies in detecting the presence and absence of a transmitter coil, leading to delayed detection of transmitter removal, due to variations in digital ping intervals and component tolerances, which affect the accuracy and timeliness of power transfer initiation.
Innovation Solution
An adaptive transmitter detection circuit powered by a low-dropout regulator and a capacitor, with a control logic system that updates a register to accurately determine the timing of digital ping signals, eliminating the need for external component adjustments and improving detection speed by using a low-power digital oscillator and a single external capacitor for power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional transmitter detection circuits are used, then the system can detect transmitter presence, but detection accuracy and timeliness are reduced due to variations in digital ping intervals and component tolerances
Solution Approach 1:
The patent implements dynamic timing adjustment by making the detection timing adaptive to the actual digital ping interval. The system measures the ping interval and adjusts the detection window accordingly, allowing the circuit to adapt to variations in transmitter behavior while maintaining accurate and timely detection.
Solution Approach 2:
The patent changes the detection parameters dynamically based on measured characteristics of the incoming ping signals. By adjusting timing parameters and detection thresholds based on actual signal characteristics, the system achieves both high accuracy and reliability across varying operating conditions.
2Adaptability or versatility
If fixed timing circuits are used, then the circuit structure is simple, but the system cannot accommodate variations in digital ping intervals
Solution Approach 1:
The patent performs preliminary measurement of the digital ping interval before establishing the detection timing. By measuring the interval in advance and configuring the detection circuit accordingly, the system achieves adaptability without requiring complex real-time adjustment mechanisms during the detection phase.
Solution Approach 2:
The system uses feedback from the measured ping interval to configure the detection timing. The detection circuit monitors the incoming signals, extracts timing information, and uses this feedback to adjust its detection parameters, creating a closed-loop system that adapts to varying ping intervals.
3Measurement precision
If multiple external components are used for timing adjustment, then the timing can be precisely configured, but the ease of manufacture and operation is reduced
Solution Approach 1:
The patent extracts the timing configuration function from external passive components and implements it within the integrated circuit itself. By moving the timing adjustment functionality into the chip, the system maintains precise timing control while eliminating the need for multiple external timing components, thereby simplifying assembly and manufacturing.
Solution Approach 2:
The integrated circuit performs multiple functions including signal detection, timing measurement, and adaptive configuration within a single device. This multi-functionality eliminates the need for separate external components for each function, simplifying the overall system while maintaining precision.
Data Source
AI summary
A method of adaptively operating a transmit detection circuit is presented. The method includes powering the transmit detection circuit with a capacitor charged by an LDO; receiving a digital ping signal from a transmitter; receiving a clock signal from a local oscillator; updating a register to accommodate timing of the digital ping signal; and generating a signal indicating whether the transmitter is present.