Hot Plug Protection via Staged Voltage Ramp
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Solution Overview
Problem
Electronic devices with multiple subsystems and components face issues with inrush current surges when connected to a direct current voltage source, leading to potential damage and reduced functionality, especially during hot plug events where components are replaced without powering down the entire system.
Innovation Solution
A power supply system that provides multiple non-zero voltages, where the electronic component is initially supplied with a first non-zero voltage and, upon receiving a signal from the component, transitions to a higher second voltage, reducing inrush current and enabling hot-swapping of components without shutting down the entire system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a component is connected to a DC voltage source during hot plug events, then the component can be replaced without powering down the system, but inrush current surges occur causing potential damage and reduced functionality
Solution Approach 1:
The power supply is configured to provide a reduced initial voltage (e.g., 5V) before the component is fully connected or before full power is applied. This preliminary low-voltage state prevents inrush current surges by limiting the voltage differential that drives the surge, while still allowing the component to be electrically connected and recognized by the system. Once the component is stable, the voltage is then increased to the full operating level.
Solution Approach 2:
The patent implements dynamic voltage adjustment by changing the voltage parameter over time during the hot-plug event. The power supply transitions from a first voltage level (reduced voltage) to a second voltage level (full operating voltage) based on detection signals from the component. This parameter change strategy allows the system to adapt the electrical characteristics to match the component's readiness state, preventing damage from sudden high-voltage application.
2Power
If full voltage is applied immediately upon connection, then the component operates at full capacity, but inrush current causes brownout to other systems and increases power supply capacity requirements
Solution Approach 1:
The power supply applies a reduced initial voltage before the component is fully operational, thereby preventing the inrush current surge that would otherwise occur. This preliminary low-power state allows the system to avoid the harmful energy spike while still establishing electrical connection and enabling gradual power ramp-up. The full operational power is achieved subsequently without the harmful initial surge.
Solution Approach 2:
The voltage application occurs in periodic stages rather than as a single instantaneous event. The power supply first applies a reduced voltage, waits for component acknowledgment or stabilization, then transitions to full voltage. This staged, periodic approach to power application eliminates the single large inrush current event while distributing the energy delivery over time.
3Reliability
If multiple voltage levels are implemented in the power supply, then inrush current is reduced and hot-swapping is enabled, but the power supply complexity increases
Solution Approach 1:
The power supply is designed to provide multiple voltage levels (reduced voltage and full operating voltage) through a single integrated unit. This multi-functional power supply can adapt its output based on the connection state and component requirements, eliminating the need for separate power supplies or complex external voltage control circuits. The universal design achieves both protection and hot-swapping capability within one device.
Solution Approach 2:
The system employs feedback mechanisms where the power supply monitors component connection status and readiness signals, then automatically adjusts the voltage level accordingly. This closed-loop control allows the power supply to intelligently transition between voltage states based on real-time system conditions, providing protection without requiring complex manual intervention or external control systems.
Data Source
AI summary
A system for reducing inrush current to an electronic component, the system including: a power supply, the power supply providing power at multiple non-zero voltages; and the electronic component; wherein, when the electronic component is connected to the power supply, the power supply provides a first non-zero voltage to the electronic component and, in response to a signal from the electronic component, provides a second voltage, the second voltage being higher than the first voltage, to the electronic component.