Power Supply Abnormality Detection Time Adjustment
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Solution Overview
Problem
Existing power supply systems face challenges in accurately determining abnormalities in alternating-current power supplies, leading to potential load stoppages and reduced relay switch reliability due to frequent switching, which can decrease product lifetime and accuracy.
Innovation Solution
A power supply system that adjusts the time for abnormality determination based on load conditions, using a converter unit, operation control unit, switch element, input voltage detector, output current detector, abnormality determining unit, switching control unit, and time adjustment unit to optimize abnormality detection and minimize switch element switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the number of abnormality determination executions is reduced to avoid frequent relay switch switching, then relay switch lifetime is improved, but abnormality determination accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by making the abnormality determination period variable rather than fixed. The control unit adjusts the determination period dynamically based on the operational state of the power supply device. When the device has been operating normally for a long period, the determination period is extended to reduce switching frequency and protect the relay switch. When abnormalities are detected or the operating period is short, the determination period is shortened to maintain determination accuracy. This dynamic adjustment resolves the contradiction between relay switch lifetime and abnormality determination accuracy.
2Measurement precision
If abnormality determination is performed frequently to maintain high accuracy, then abnormality detection accuracy is improved, but relay switch switching frequency increases reducing product lifetime
Solution Approach 1:
The patent applies parameter changes by modifying the time parameter (determination period) based on operational conditions. The control unit changes the determination period parameter according to the power supply device's operational history and current state. This parameter adjustment allows the system to maintain adequate abnormality detection accuracy while reducing the frequency of relay switch operations, thereby extending product lifetime. The key is changing the temporal parameter of abnormality determination to match operational needs.
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
This configuration enables accurate abnormality determination and maintains power supply to the load by adjusting determination time according to load conditions, reducing switch element switching frequency and preventing load stoppages, thus extending switch element lifetime and improving reliability.
Implementation Method 1
a converter unit that converts an input alternating-current voltage into a direct-current voltage
Implementation Method 2
an input voltage detector that detects an input voltage input to the converter unit
Implementation Method 3
an output current detector that detects an output current output from the converter unit
Data Source
AI summary
A power supply system that includes a converter that converts an input alternating-current voltage into a direct-current voltage and outputs the direct-current voltage to a load. The system includes a switcher that electrically connects one of multiple alternating-current power supplies to the converter, a voltage detector that detects an input voltage input to the converter, and a current detector that detects an output current output from the converter. The switcher repeats, for a predetermined amount of time, a determination of whether there is an abnormality in alternating-current power supply based on the input voltage detected by the voltage detector. Moreover, if there is an abnormality, the switcher switches which alternating-current power supply is connected to the converter. Further, the switcher adjusts, based on the result of detection by the current detector, the amount of time for which the determination is performed.