Voltage Control Using Rectifying Circuitry for Wireless Power
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Solution Overview
Problem
Wirelessly powered apparatuses face inefficiencies due to variations in load and magnetic field, leading to unstable voltage output, particularly in multi-apparatus configurations where different devices draw varying power levels, resulting in impedance mismatches and reduced power intake efficiency.
Innovation Solution
A voltage control circuitry using a first and second rectifying circuit, controlled by a logic circuit, which adjusts the impedance of a capacitor by diverting excess power to it when the output voltage exceeds a threshold, synchronizing rectification with the load's power requirements to minimize impedance mismatch and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rectifying circuit is used to convert AC signal to DC signal in wirelessly powered apparatus, then power can be transferred wirelessly, but the output voltage varies due to load variations and magnetic field variations
Solution Approach 1:
The patent implements dynamic impedance adjustment by switching between multiple rectifying circuits with different impedance characteristics. The system dynamically selects which rectifying circuit to use based on real-time detection of voltage, current, and power conditions, allowing the impedance to adapt to varying load and magnetic field conditions rather than remaining fixed.
Solution Approach 2:
The system changes the impedance parameter of the rectifying circuit by selecting different circuits with different impedance values. The controller monitors power intake efficiency and adjusts the operating parameters (which rectifying circuit is active) to optimize performance under different operating conditions, thereby stabilizing voltage output despite external variations.
2Productivity
If multiple wirelessly powered apparatuses are powered by the same transmitter, then power distribution is achieved, but impedance mismatch occurs due to different power draw levels
Solution Approach 1:
Each wirelessly powered apparatus is equipped with its own set of rectifying circuits with different impedance characteristics, allowing each device to independently optimize its own power reception. The local impedance adjustment at each receiver ensures that each apparatus can efficiently draw power according to its specific power requirements, preventing energy loss due to impedance mismatch in multi-device configurations.
3Loss of energy
If the impedance of the capacitor is adjusted to reduce mismatch, then power intake efficiency increases, but the system complexity increases
Solution Approach 1:
The system segments the rectifying function into multiple independent rectifying circuits, each with a capacitor and associated switching elements. This segmentation allows each circuit to operate semi-independently with its own impedance characteristics, simplifying the control logic while achieving overall impedance optimization through selective activation of appropriate segments.
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 increases the power intake efficiency of wirelessly powered devices by reducing impedance mismatch and maintaining a constant voltage supply, achieving up to 86.5% efficiency in multi-apparatus configurations compared to static impedance solutions.
Implementation Method 1
a rectifying circuit to convert the wireless signals from an alternating current (AC) signal to a direct circuit (DC) signal
Implementation Method 2
provide the rectified signal to a capacitor (102)
Implementation Method 3
The second apparatus receives the wireless signal using an antenna
Data Source
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AI summary
Aspects of the present disclosure are directed to methods, apparatuses and systems involving voltage control using rectifying circuitry. According to an example embodiment, an apparatus includes an antenna, a capacitor, and voltage control circuitry. The voltage control circuitry includes a first rectifying circuit to rectify a wireless signal and provide the rectified signal to an output load, a second rectifying circuit to rectify the wireless signal and provide the rectified signal to the capacitor, and a control logic circuit to regulate an output voltage provided to the output load relative to a threshold value. For each rectifying cycle, the control logic circuit determines whether the output voltage is above the threshold value, enables, in response to determining that the output voltage is below the threshold value, the first rectifying circuit, and enables, in response to determining that the output voltage is above the threshold value, the second rectifying circuit.