Inverter Testing Device AC-DC Control for Voltage Abnormality
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Solution Overview
Problem
The existing testing devices for inverter devices face a control imbalance due to response delays during instantaneous voltage abnormality tests, which can lead to power circulation imbalances and potential DC overvoltage or output fluctuations.
Innovation Solution
A testing device with a power supply device featuring an AC-DC conversion circuit and a control part that adjusts output in response to a test start signal, using a filter circuit with a reactor and capacitor to deliver DC power to the tested inverter device, allowing for prompt control corrections during voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply device uses conventional control response during instantaneous voltage abnormality test, then the control part reacts to voltage changes, but the response delay causes power circulation imbalance
Solution Approach 1:
The control part executes output adjustment of the AC-DC conversion circuit in advance when a test start signal is generated, before the instantaneous voltage change actually occurs. This preliminary action eliminates the response delay that would otherwise cause power circulation imbalance during the test.
2Adaptability or versatility
If the AC power supply changes voltage instantaneously during operation, then the instantaneous voltage abnormality test can be conducted, but the power supply device experiences control imbalance due to delay
Solution Approach 1:
The control part performs output adjustment in advance upon receiving the test start signal, preparing the AC-DC conversion circuit for the upcoming instantaneous voltage change. This prevents control imbalance and maintains power circulation stability despite the voltage disturbance.
Solution Approach 2:
The control part monitors the operation state of the power supply device and tested inverter device, and executes output adjustment based on feedback from the test start signal to maintain power circulation balance during voltage abnormalities.
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 the power supply device to execute timely control adjustments, suppressing control imbalances and maintaining power circulation balance during instantaneous voltage abnormality tests, thereby preventing transient response delays and ensuring stable operation.
Implementation Method 1
an AC-DC conversion circuit for converting AC power received from an AC power supply into DC power
Implementation Method 2
a filter circuit consisting of a reactor and a capacitor, and delivering the DC power output from the power supply device to the tested inverter device
Data Source
AI summary
A testing device of an inverter device includes a power supply device including an AC-DC conversion circuit for converting AC power received from an AC power supply into DC power and a control part for controlling the AC-DC conversion circuit and a filter circuit interposed between a tested inverter device to be tested and the power supply device, having a reactor and a capacitor, and delivering the DC power output from the power supply device to the tested inverter device. The control part is configured to execute output adjustment of the AC-DC conversion circuit when a test start signal is generated to start an instantaneous voltage abnormality test which is a test changing magnitude of power supply voltage of the AC power supply in a predetermined direction being either one of increase or decrease during operation of the tested inverter device and the power supply device.