Adaptive Overcurrent Protection Circuit for PCIe Peripheral Power
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Solution Overview
Problem
Existing power protection circuits for peripheral devices, such as PCIe devices, struggle to provide effective overcurrent protection across a wide range of power requirements, often failing to protect devices with lower power needs when set for higher power devices.
Innovation Solution
A power protection circuit with an adjustable resistance mechanism, controlled by sense signals from connectors, dynamically adjusts overcurrent protection settings based on the specific power requirements of connected peripheral devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power protection circuit is set for higher power devices, then high power devices are protected, but lower power devices cannot be protected
Solution Approach 1:
The power protection circuit dynamically adjusts its protection threshold based on the power requirements of the connected peripheral device. The circuit monitors the power consumption of the device and automatically modifies the overcurrent protection level to match the specific device needs, enabling effective protection across a wide range of power requirements from 75W to 300W
Solution Approach 2:
The invention changes the protection parameter (current threshold) according to the power requirements of different peripheral devices. By detecting the power requirement level and adjusting the protection circuit's threshold accordingly, the system achieves both high power device protection and compatibility with lower power devices
2Reliability
If the power protection circuit is set for lower power devices, then low power devices are protected, but higher power devices cannot be protected
Solution Approach 1:
The protection circuit transitions from a static threshold to a dynamic adjustment mechanism that scales the protection level with the device's power requirements, allowing the same circuit to safely handle both low power (75W) and high power (300W) devices
Solution Approach 2:
The circuit modifies its operational parameters (protection threshold) based on the detected power requirements, enabling it to adapt its maximum power handling capability to match the connected device whether it is 75W or 300W
3Device complexity
If a fixed overcurrent threshold is used, then the protection circuit is simple, but it cannot adapt to different power requirements
Solution Approach 1:
The power protection circuit incorporates a feedback mechanism that monitors the power requirements of connected devices and uses this information to automatically adjust the protection threshold. This feedback loop enables the circuit to adapt to different power requirements without manual intervention while maintaining reasonable structural complexity
Solution Approach 2:
The invention creates a universal protection circuit that can serve multiple power requirement levels (75W, 150W, 225W, 300W) through a single adaptive mechanism, replacing the need for multiple fixed-threshold circuits with one multi-functional solution
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 ensures robust overcurrent protection for peripheral devices with varying power needs, preventing damage from excessive current and adapting to different wattage requirements, thereby enhancing safety and reliability.
Implementation Method 1
a resistance circuit connected to the power protection circuit, where the resistance circuit is configured to provide to the power protection circuit an adjustable resistance based on one or more sense signals from the one or more connectors
Implementation Method 2
perform a comparison between a first voltage determined based on the sensed current and a constant resistor and a second voltage determined based on the adjustable resistance and a constant current
Data Source
AI summary
Methods, devices, subsystems, systems, and techniques for managing overcurrent protections for peripheral devices are provided. An example device includes: one or more connectors configurable to connect one or more peripheral devices having one or more corresponding power requirements; a power protection circuit configured to provide overcurrent protection to a peripheral device connected to the device; and a resistance circuit configured to provide to the power protection circuit an adjustable resistance based on one or more sense signals from the one or more connectors. The one or more sense signals are based on a connection status between the one or more connectors and the peripheral device, and the one or more sense signals indicate a corresponding power requirement of the peripheral device. The power protection circuit is configured to stop providing power to the peripheral device based on the adjustable resistance and a sensed current associated with the peripheral device.