Wireless Charger Over-Voltage Regulation Across Rectifier and Regulator
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Solution Overview
Problem
Existing wireless power systems face limitations in effectively managing over-voltage conditions, as existing methods either clamp voltage locally, reduce power inefficiently, or cause communication issues, leading to potential damage to devices and hazardous conditions.
Innovation Solution
An over-voltage protection circuit comprising differential amplifiers, a comparator, a switch, and a regulating circuit that monitors and regulates voltage differences between the output of a rectifier and a voltage regulator, dissipating excess power to prevent overstressing individual components and ensuring proper communication between devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard over-voltage protection is used to counteract excess power, then protection against over-voltage is improved, but excess power is dissipated solely in localized elements causing potential damage
Solution Approach 1:
The protection circuit is divided into multiple functional segments: a monitoring circuit that detects over-voltage conditions, a control circuit that processes the monitoring signal, and a regulating circuit that executes power dissipation. This segmentation allows the excess power to be managed systematically across multiple elements rather than concentrated in a single protective component, resolving the contradiction between effective protection and localized power dissipation damage.
2Reliability
If hard over-voltage protection is triggered, then over-voltage counteraction is improved, but in-band communication between devices is disrupted
Solution Approach 1:
The protection circuit operates dynamically by continuously monitoring voltage levels and adjusting its response accordingly. When over-voltage is detected, the control circuit activates the regulating circuit to dissipate excess power while maintaining system operation. This dynamic approach allows the system to provide protection without permanently disrupting communication, as the protection mechanism can be modulated to coexist with in-band communication protocols.
3Reliability
If clamping circuits are used to protect against excess voltage, then voltage protection is improved, but system complexity increases
Solution Approach 1:
The monitoring, control, and regulating functions are merged into an integrated protection circuit that operates as a unified system. The monitoring circuit directly feeds into the control circuit, which in turn controls the regulating circuit, creating a cohesive protection mechanism. This merging reduces overall system complexity compared to having separate protection components, while still providing comprehensive over-voltage protection through the coordinated operation of integrated functional blocks.
Data Source
AI summary
An over-voltage protection circuit and methods of operation are provided. In one embodiment, a method includes monitoring a voltage at an output of a rectifier, a voltage at an output of a voltage regulator, or a combination thereof. The method further includes determining the over-voltage condition based on the monitoring; and in response to determining the over-voltage condition, regulating the voltage at the output of the rectifier in accordance with a voltage difference between the voltage at the output of the rectifier and the voltage at the output of the voltage regulator.