Capacitive Load Testing Device for Power Supply Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply units (PSU) in computers face challenges in accurately determining the largest capacitance value of their outputs, leading to over-current protection and failure to operate when capacitive loads exceed this value, making it crucial to understand and manage these loads during main board design.
Innovation Solution
A capacitive load testing device that includes a power supply switching circuit, current sampling circuit, capacitive load switching circuit, discharge circuit, and controller to determine the greatest capacitance value by electronically connecting and disconnecting outputs, sampling currents, and adjusting capacitance values to identify the maximum safe load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitive load exceeds the largest capacitance value, then the PSU executes over-current protection and stops outputting voltage, but the computer cannot be operated or turned on
Solution Approach 1:
The patent applies preliminary action by pre-determining the largest capacitance value through automated testing before actual computer operation. The testing device connects to the PSU output, automatically increases capacitive load in steps, and identifies the maximum capacitance value before the PSU is put into service, preventing operational failures later
2Measurement precision
If the largest capacitance value is not accurately determined, then the PSU may fail to operate when capacitive loads exceed the value, but implementing comprehensive testing increases device complexity
Solution Approach 1:
The testing device implements universality by designing a multi-functional integrated system that combines power supply switching, capacitive load switching, current sampling, and control functions in a single device. This allows accurate determination of the largest capacitance value without requiring multiple separate testing equipment
Solution Approach 2:
The patent uses an intermediary approach by introducing a dedicated testing device as a mediator between the PSU and the computer system. This testing device safely interfaces with the PSU output, performs automated capacitance value determination, and provides results without requiring direct human intervention or complex manual testing procedures
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
Enables precise determination of the largest capacitance value for each output, preventing over-current protection and ensuring the PSU operates correctly by accurately testing and managing capacitive loads, thereby facilitating reliable computer operation.
Implementation Method 1
The capacitive load switching circuit (50) is electronically connected or disconnected to one of the outputs (P1-P4) of the power supply according to the switches turned on and off by the controller (20)
Implementation Method 2
The controller (20) receives a current sampling by the current sampling circuit (40) and determines weather the capacitive load electronically connected to the PSU (200) is the largest capacitance value by the output current
Data Source
AI summary
A device for testing capacitive loads of a power supply includes a controller, a power supply switching circuit, a capacitive load switching circuit, and a current sampling circuit. The power supply switching circuit selects one of output voltages of the power supply to be electronically connected to the capacitive load switching circuit and the current sampling circuit. The current sampling circuit samples an output current of one output of the power supply selected by the controller. The controller turns on and off switches of the capacitive load switching circuit for matching an output current of the power supply with a reference current until the output current equals to the reference current. The controller outputs a total magnitude of the capacitive loads.