Power Management Circuit RF Proximity Arc Prevention
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Solution Overview
Problem
Existing charging systems face issues with sudden disconnects during high current charging, leading to potential damage from arcing due to voltage spikes when a user pulls out a charging cable, as they cannot effectively manage power levels to prevent such incidents.
Innovation Solution
A power management circuit utilizing RF signals to detect changes in proximity and movement, transitioning the device from a higher to a lower power level or switching it off to prevent arcing, incorporating an RF transmitter, receiver, and proximity detection circuit to adjust power levels based on detected attributes and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high current charging is used to improve charging speed, then productivity is improved, but reliability deteriorates due to potential arcing and voltage spikes during sudden disconnects
Solution Approach 1:
The system performs preliminary detection of disconnect conditions (such as cable removal or device separation) before the actual disconnection occurs. When a disconnect condition is detected, the power management circuit proactively reduces the charging current from high to low or shuts off power before the physical disconnect happens, preventing voltage spikes and arcing that would otherwise occur during sudden interruption of high current flow.
Solution Approach 2:
The system continuously monitors charging conditions and provides feedback to the power management circuit. When the monitoring circuit detects a disconnect condition (such as change in electrical characteristics indicating cable removal), it signals the power management circuit to adjust the charging current accordingly, creating a closed-loop control system that prevents harmful voltage spikes during disconnection.
2Reliability
If power management circuit with proximity detection is added to prevent arcing, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated power management circuit. The circuit integrates high-current charging capability, proximity detection functionality, and automatic power level adjustment all in one component. This merging approach allows the system to achieve reliable arc prevention during disconnection without proportionally increasing overall device complexity, as the detection and control functions are unified within the existing power management infrastructure.
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
Prevents voltage spikes and arcing by dynamically adjusting charging currents, ensuring safe disconnection and reducing the risk of damage to connectors and electronic circuits during charging.
Implementation Method 1
generating an RF signal having a set of transmitted RF signal attributes with the RF transmitter; detecting the RF signal having a set of received RF signal attributes with the RF receiver
Implementation Method 2
detecting the RF signal having a set of received RF signal attributes with the RF receiver; transition the device operational configuration from the first power level to the second power level in response to a preselected difference between the transmitted set of RF signal attributes and the received set of RF signal attributes
Data Source
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AI summary
One example discloses a power management circuit, wherein the power management circuit is configured to cause a device to be operated at a first power level and a second power level. The circuit includes: an RF transmitter configured to generate an RF signal having a set of transmitted RF signal attributes; an RF receiver configured to detect the RF signal having a set of received RF signal attributes; and a proximity detection circuit configured to transition the device from the first power level to the second power level in response to a preselected difference between the transmitted set of RF signal attributes and the received set of RF signal attributes.