Power Supply Voltage Clamping for Spike Protection
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Solution Overview
Problem
Information handling systems face damage from voltage spikes in unstable power systems, as AC adapters fail to protect against voltage spikes exceeding typical household voltages, potentially damaging power supply units.
Innovation Solution
A power supply unit with a filter module, rectifier module, voltage regulator module, capacitor module, and DC/DC converter, which filters and rectifies AC voltage, clamps excessive DC voltage, averages peaks, and converts to a desired DC voltage level, incorporating a feedback control loop and pulse width modulator to ensure protection and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard AC adapters are used in unstable power systems, then the system can operate with typical household voltages, but the power supply unit fails when voltage spikes reach nearly 400 volts AC
Solution Approach 1:
The voltage regulator module continuously monitors the DC voltage signal before it reaches downstream components and proactively clamps the voltage when it exceeds the threshold, preventing voltage spike damage before it can affect other parts of the power supply unit
Solution Approach 2:
The voltage regulator module converts the harmful voltage spikes into beneficial protected operation by clamping excessive voltage to safe levels, transforming the threat into an opportunity to demonstrate system robustness and protect components
2Reliability
If higher-cost components are used to withstand voltage spikes, then the power supply unit can handle unstable power systems, but the overall system cost increases
Solution Approach 1:
The voltage regulator module acts as an intermediary protective layer between the rectifier module and downstream components, using a simple and cost-effective clamping mechanism to protect the entire system from voltage spikes without requiring expensive high-voltage-rated components throughout
Solution Approach 2:
The voltage regulator module uses a simple, low-cost clamping circuit that can be easily replaced if needed, providing effective protection at minimal cost compared to using expensive high-voltage components throughout the entire power supply unit
3Reliability
If the DC voltage signal is clamped when above threshold, then components are protected from excessive voltage, but the DC voltage signal becomes non-proportional to the AC voltage signal
Solution Approach 1:
The voltage regulator module dynamically adjusts its operation based on the instantaneous DC voltage level, passing through normal voltage signals proportionally to AC input while actively clamping only when voltage exceeds the safety threshold, creating a dynamic response that balances protection with signal fidelity
Solution Approach 2:
The voltage regulator module changes the operational parameter of voltage proportionality conditionally - maintaining proportional relationship when voltage is within normal range and breaking proportionality only when voltage exceeds threshold to activate protection mode
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 effectively protects the power supply unit and its components from excessive peak AC events, enhancing reliability, reducing costs, and maintaining quality by preventing the need for higher-cost components.
Implementation Method 1
a filter module configured to filter an AC voltage signal
Implementation Method 2
a rectifier module to rectify the filtered AC voltage signal to generate a DC voltage signal
Implementation Method 3
clamp the DC voltage signal such that the clamped DC voltage signal i) is not proportional to the AC voltage signal and ii) is less than the threshold voltage level
Implementation Method 4
a capacitor module to average peaks voltages of the clamped DC voltage signal
Implementation Method 5
a DC/DC converter to convert the averaged DC voltage signal to a converted DC voltage signal, the converted DC voltage signal having a desired DC voltage level
Data Source
AI summary
A power supply unit for an information handling system, including a filter module configured to filter an AC voltage signal; a rectifier module to rectify the filtered AC voltage signal to generate a DC voltage signal, the DC voltage signal proportional to the AC voltage signal; a voltage regulator module configured to determine that the DC voltage signal is above a threshold voltage level, and in response, clamp the DC voltage signal such that the clamped DC voltage signal i) is not proportional to the AC voltage signal and ii) is less than the threshold voltage level; a capacitor module to average peaks voltages of the clamped DC voltage signal; and a DC/DC converter to convert the averaged DC voltage signal to a converted DC voltage signal, the converted DC voltage signal having a desired DC voltage level.