Wireless Charging Rectifier Timing for Low-Power Implant Devices
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Solution Overview
Problem
Existing wireless power transfer technologies face inefficiencies when receiving low-power signals, particularly in applications where the power receiving device is implanted or ingested, due to the need for continuous power consumption by rectifiers and the limitations of synchronous control methods.
Innovation Solution
A charging circuitry that includes a power receiver, a rectifying switch, a comparator, and a delay circuit. The comparator identifies extreme points in the output voltage signal of the power receiver and controls the rectifying switch to turn on synchronously with these points. The delay circuit disables the comparator for a delay period, reducing power consumption and allowing for efficient energy storage and transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a rectifier is used to convert AC voltage to DC voltage in the power receiving device, then power conversion is achieved, but static power consumption increases and overall efficiency decreases
Solution Approach 1:
The patent implements periodic switching action where the rectifying switch is turned on only during specific periods when the resonant circuit stores sufficient energy, rather than continuous operation. The control circuit monitors the resonant frequency cycles and activates the switch periodically at optimal moments, converting AC to DC only when energy thresholds are met, thereby eliminating continuous static power consumption while maintaining power conversion capability
Solution Approach 2:
The resonant circuit automatically accumulates energy over multiple cycles and self-regulates the switching timing based on its own resonant frequency characteristics. The system uses the natural resonance behavior to determine when sufficient energy is stored, eliminating the need for external continuous control power and allowing the circuit to serve itself in optimizing the conversion timing
2Quantity of substance
If the power receiving device stores energy from multiple resonant cycles, then energy accumulation is improved, but the number of cycles increases and static power consumption for controlling the rectifier limits overall efficiency
Solution Approach 1:
The control circuit continuously monitors the voltage across the resonant circuit and provides feedback to determine when the energy threshold is reached. This feedback mechanism allows the system to count resonant cycles and activate the rectifying switch at the precise moment when sufficient energy has been accumulated, optimizing the balance between energy storage quantity and time/cycle consumption without continuous power consumption
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
This solution enables efficient power transfer by reducing power consumption in the charging circuitry, allowing for more effective energy storage and transfer, even with weak wireless power signals, thus improving the overall efficiency of wireless power reception.
Implementation Method 1
a power receiver configured to receive an alternating current (AC) wireless power signal and configured to store energy through resonance
Implementation Method 2
a comparator connected to the output of the power receiver and configured to identify an extreme point of an output voltage signal of the power receiver
Data Source
AI summary
A charging circuitry for receiving power through wireless power transfer comprises: a power receiver configured to receive an alternating current (AC) wireless power signal and store energy through resonance; a rectifying switch configured to selectively connect an output of the power receiver to a load a comparator connected to the output of the power receiver and configured to identify an extreme point of an output voltage signal (vs) of the power receiver and configured to cause the rectifying switch to be turned on based on identification of the extreme point; and a delay circuit configured to control a state of the comparator such that the comparator is disabled for a delay period between successive instances of the rectifying switch being turned on.