LDO-Free Wireless Power Receiver Rectifier
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Solution Overview
Problem
Existing wireless power transmission systems for portable electronic devices require additional area for voltage regulation, which is not efficient in portable devices and can be cumbersome due to the need for wired charging, and they lack space for charging ports, especially in smaller devices like earbuds and smartwatches.
Innovation Solution
A bridge rectifier and associated control circuitry that performs both rectification and regulation functions using both voltage and current feedback, allowing for in-phase and anti-phase regulation to manage excess power without an additional voltage regulation circuit, thereby reducing the need for separate components and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate voltage regulation circuit is used in wireless power transmission systems, then voltage regulation function is achieved, but integrated circuit area is substantially consumed
Solution Approach 1:
The patent combines the voltage regulation function with the bridge rectifier by enabling the rectifier transistors to operate in linear mode for power dissipation. The same transistor components perform both rectification and voltage regulation, eliminating the need for a separate regulator circuit and its associated power MOS device, thereby substantially reducing integrated circuit area consumption.
Solution Approach 2:
The bridge rectifier transistors are designed to perform multiple functions: they operate as switches for rectification during normal operation and as linear regulators for voltage regulation when excess power needs to be dissipated. This multi-functionality allows a single component to replace what would traditionally require separate dedicated components for each function.
2Adaptability or versatility
If wireless power transmission is implemented to eliminate charging ports, then water resistance is enhanced and device space is freed, but power management complexity increases
Solution Approach 1:
The patent merges the voltage regulation function into the existing bridge rectifier circuitry of the wireless power receiver. By making the rectifier transistors capable of linear operation for power dissipation, the system achieves voltage regulation without adding separate control circuits or components, thereby minimizing the increase in power management complexity while enabling wireless charging.
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 management within a smaller form factor, reducing area consumption and improving efficiency by integrating rectification and regulation functions, allowing for cleaner data communication and stable power delivery in portable devices.
Implementation Method 1
a receiver 15 including a receiver coil Ls and a serial capacitance Cs forming a similar serial resonant L,C network in which the time-varying electric field induces an AC current
Data Source
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AI summary
A bridge rectifier and associated control circuitry collectively form a "regtifier" which rectifies an input time varying voltage and regulates the rectified output voltage produced without the use of a traditional voltage regulator. To accomplish this, the gate voltages of transistors of the bridge rectifier that are on during a given phase may be modulated via analog control (to increase the on-resistance of those transistors) or via pulse width modulation (to turn off those transistors prior to the end of the phase). The transistors of the bridge rectifier that would otherwise be off during a given phase may be turned on to help dissipate excess power and thereby regulate the output voltage. This modulation is based upon both a voltage feedback signal and a current feedback signal.