Power Protection Circuit for Inrush Current Mitigation
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Solution Overview
Problem
Consumer electronic devices are prone to damage due to inrush currents generated by transient voltage changes when external devices are plugged in or out, causing permanent damage to the internal core circuit.
Innovation Solution
An electronic device with a transfer port, a first switch, a first detecting unit, a second detecting unit, and a triggering unit, where the first switch is selectively turned off based on control signals generated when a voltage drop exceeds a threshold or a sampling voltage is lower than a reference voltage, effectively mitigating inrush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transfer port provides driving voltage to external devices, then data transfer and charging functions are enabled, but inrush current is generated when external devices are plugged in/out causing permanent damage to the electronic device
Solution Approach 1:
A detection circuit is introduced as an intermediary between the transfer port and the power supply. This detection circuit monitors voltage changes and generates control signals to switch circuits, which then control the power supply to the transfer port. This intermediary system enables the transfer function while protecting against inrush current damage by automatically controlling power supply based on detected voltage conditions.
Solution Approach 2:
The detection circuit performs preliminary detection of voltage changes before inrush current can cause damage. When a voltage drop exceeding a threshold is detected (indicating plug-in or plug-out event), the system proactively controls the switch circuit to cut off or limit power supply, preventing the harmful inrush current from reaching the transfer port before damage can occur.
2Reliability
If voltage detection and control circuits are added to protect against inrush current, then reliability of the internal core circuit is improved, but device complexity increases
Solution Approach 1:
The detection circuit automatically monitors voltage changes and generates control signals without external intervention. The switch circuit responds autonomously to control signals, automatically controlling power supply to the transfer port. This self-service mechanism achieves reliable power protection while minimizing the need for external control systems or complex manual intervention circuits.
Solution Approach 2:
The detection function and control function are merged into an integrated protection system. The detection circuit and switch circuit work together as a unified system where the detection circuit's output directly controls the switch circuit's operation. This merging reduces the need for separate complex control systems and simplifies the overall circuit structure while maintaining reliable protection.
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 provides reliable and safe power protection to the internal core circuit by reducing the impact of inrush currents, preventing damage during plug-in and plug-out operations, and ensuring normal system operation.
Implementation Method 1
The first detecting unit generates the first control signal when a voltage drop of a driving voltage exceeds than a threshold voltage
Implementation Method 2
The second detecting unit detects the driving voltage to generate a sampling voltage, and the second control signal is generated when the sampling voltage is lower than a first reference voltage
Data Source
AI summary
An electronic device and a power protection method are provided. The electronic device includes a transfer port, a switch, a first detecting unit and a second detecting unit. The transfer port provides a driving voltage to an external device. The switch is coupled between the transfer port and a supply power source, and the switch is selectively turned off according to at least one of a first control signal and a second control signal. The first detecting unit generates the first control signal when a voltage drop of the driving voltage exceeds a threshold voltage. The second detecting unit generates a sampling voltage by detecting the driving voltage and generates the second control signal when the sampling voltage is lower than a first reference voltage. The electronic device can provide a power protection when an external device is plugged in/out the transfer port.