Wireless Power Receiver With Threshold-Controlled Voltage Multiplier
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Solution Overview
Problem
Current wireless power receivers struggle to efficiently convert low-level incident power with wide frequency spectra to reliable DC power, especially at low power levels, leading to inefficiencies and reverse current drain during battery charging.
Innovation Solution
A wireless power receiver apparatus comprising a first converter module that converts electromagnetic waves to a DC voltage, a sensor module to monitor and control a second converter module, which enables or disables power delivery based on threshold voltages, and additional modules for impedance matching and power storage to optimize DC voltage output and minimize reverse current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless power receiver uses a resistive load to convert low-level incident power to DC voltage, then even low power levels can produce a DC voltage, but the DC voltage is not constant or reliable and varies proportionately with incident power
Solution Approach 1:
The patent employs a dynamic control system that adjusts the load impedance based on the incident power level to maintain a constant DC voltage output. The controller monitors the rectified voltage and dynamically modifies the impedance of the power conversion circuitry, transitioning from a fixed resistive load to an adaptive impedance load that compensates for variations in incident power, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent implements a feedback control mechanism where the controller continuously monitors the DC voltage output from the rectifier and adjusts the power conversion circuitry accordingly. This closed-loop feedback system ensures that even when incident power varies, the output DC voltage remains constant and reliable, directly addressing the technical contradiction by introducing control complexity that eliminates voltage instability.
2Quantity of substance
If the incident power has a wide frequency spectrum, then more environmental power can be harnessed, but the conversion to DC power becomes less efficient
Solution Approach 1:
The patent designs a universal power conversion system that can handle a wide frequency spectrum incident power. The impedance-matching network and broadband rectifier are configured to accept power across multiple frequencies and convert them efficiently to a unified DC output, enabling the system to harness diverse environmental power sources while maintaining conversion efficiency through optimized circuit topology.
Solution Approach 2:
The patent utilizes parameter changes in the power conversion circuitry to adapt to different incident power frequencies. The controller dynamically adjusts operating parameters such as impedance values, switching frequencies, and rectification thresholds to optimize conversion efficiency across the wide frequency spectrum, thereby reducing energy loss while maximizing the quantity of harnessed power.
3Duration of action of stationary object
If the second converter module is always enabled to provide DC voltage to the load, then the load can operate continuously, but reverse current drains power from the battery during charging
Solution Approach 1:
The patent implements a dynamic enabling/disabling mechanism for the second converter module based on real-time monitoring of incident power levels and battery charge state. The controller dynamically switches the converter module on or off to prevent reverse current flow during battery charging while ensuring continuous load operation when power is available, thereby resolving the contradiction between operation duration and energy loss.
Solution Approach 2:
The power conversion system incorporates self-service protection where the controller automatically detects reverse current conditions and disables the converter module to prevent battery drainage. This self-regulating mechanism eliminates the need for external intervention to prevent energy loss while maintaining continuous device operation through intelligent power management.
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
The solution enables efficient power conversion and charging of devices at low power levels, providing a stable DC voltage and reducing reverse current drain, thus addressing the limitations of existing technologies in handling low-power, wide-frequency wireless power.
Implementation Method 1
a first converter module that converts a wireless power associated with an electromagnetic wave to a first DC voltage
Data Source
AI summary
An apparatus includes a first converter module, a second converter module, and a sensor module. The first converter module converts a wireless power associated with an electromagnetic wave to a first DC voltage. The first converter module can include, for example, a Villiard cascade voltage multiplier, a precision rectifier, or a full-wave bridge rectifier. The sensor module monitors the first DC voltage. The second converter module converts the first DC voltage to a second DC voltage that is larger than the first DC voltage. The second converter module is enabled by the sensor module when the first DC voltage is above a first threshold voltage. The second converter module is disabled by the sensor module when the first DC voltage is below a second threshold voltage that is lower than the first threshold voltage. The second converter module provides power to a load based on the second DC voltage.