UPS Control Circuit for Automatic Power Resumption
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Solution Overview
Problem
Conventional uninterruptible power supply apparatuses stop supplying power to loads when the output voltage of the power storage device decreases due to prolonged power failures, requiring manual activation upon commercial AC power supply resumption, which affects usability.
Innovation Solution
An uninterruptible power supply apparatus with a control circuit that manages switches and a chopper to continue inverter operation, generate DC power supply voltage, and automatically resume power supply when commercial AC power is restored, using modes to manage power flow between AC and DC sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage of the power storage device decreases to a discharge end voltage due to prolonged power failure, then the apparatus stops to protect components, but manual activation is required upon power resumption which reduces usability
Solution Approach 1:
The control circuit automatically detects when commercial AC power is restored and autonomously activates the converter and inverter to resume power supply to the load, eliminating the need for manual intervention. The system serves itself by monitoring power status and executing restart sequences without user input.
2Loss of energy
If the converter and inverter are stopped during discharge end to conserve energy, then power consumption is reduced, but automatic resumption capability is lost
Solution Approach 1:
The control circuit continuously monitors the status of commercial AC power supply and automatically adjusts the operation state of the converter and inverter. When AC power is detected as restored, the control circuit provides feedback signals to activate the power conversion components, enabling automatic resumption while maintaining energy conservation during discharge end.
3Extent of automation
If the control circuit continues operation during discharge end to enable automatic resumption, then automatic activation is achieved, but power is consumed to maintain control circuit operation
Solution Approach 1:
Instead of maintaining full operation of all system components during discharge end, the control circuit performs only the minimal necessary function of monitoring AC power status and executing restart commands. This partial action approach enables automatic resumption capability while consuming minimal energy, avoiding the need to maintain converter and inverter operation during the discharge end state.
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
Ensures automatic resumption of power supply to loads when commercial AC power is restored after a power failure, enhancing the usability and reliability of the uninterruptible power supply apparatus.
Implementation Method 1
a converter converting first AC electric power supplied from a commercial AC power supply to DC electric power
Implementation Method 2
an inverter converting the DC electric power supplied from the converter or a power storage device to second AC electric power having a commercial frequency
Data Source
AI summary
In this uninterruptible power supply apparatus, even after electric power supply to a load stops due to prolonged power failure time, the operation of an inverter is continued, a DC power supply voltage is generated based on an output of the inverter, and a control circuit is driven by the DC power supply voltage. Therefore, when electric power supply from a commercial AC power supply is resumed during the stop of electric power supply to the load, electric power supply to the load is automatically resumed by the control circuit.