UPS AC Output Circuit for Continuous Backup of AC Loads
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Solution Overview
Problem
Conventional uninterruptible power supplies (UPS) can only provide direct current (DC) voltage to DC loads, failing to support alternating current (AC) loads during abnormal utility power conditions, which disrupts the operation of AC devices such as display screens.
Innovation Solution
A backup power supply system that includes a power supply circuit and an uninterruptible power supply with an AC output terminal, capable of outputting AC voltage that meets utility power specifications both during normal and abnormal utility power conditions, ensuring continuous operation of AC loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional uninterruptible power supply is used, then DC loads can be supported during abnormal utility power conditions, but AC loads cannot continue to operate normally
Solution Approach 1:
The uninterruptible power supply is enhanced with an AC output terminal that can output AC voltage, enabling it to support both DC loads (through the power supply circuit) and AC loads (through the AC output terminal). This multi-functionality allows the single device to provide comprehensive backup power for diverse load types during abnormal utility power conditions.
Solution Approach 2:
An AC output terminal is introduced as an intermediary component between the uninterruptible power supply and AC loads. This intermediary enables the transfer of power from the uninterruptible power supply to AC loads by outputting AC voltage that meets utility power specifications, thereby bridging the compatibility gap.
2Duration of action of stationary object
If power supply circuit supplies power to uninterruptible power supply during normal utility power, then uninterruptible power supply can store backup power, but system complexity increases
Solution Approach 1:
The power supply circuit and uninterruptible power supply are integrated into a unified system where the power supply circuit serves dual purposes: supplying power to loads during normal operation and charging the uninterruptible power supply during abnormal conditions. This merging reduces overall system complexity by eliminating the need for separate charging infrastructure.
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 system effectively supplies AC power that meets utility power specifications to AC loads, allowing them to operate normally regardless of the utility power status, thereby addressing the limitations of conventional UPS systems.
Implementation Method 1
an uninterruptible power supply connected to the power supply circuit and storing backup power
Data Source
AI summary
A backup power supply system and a control method thereof are provided. The backup power supply system includes a power supply circuit and an uninterruptible power supply. The power supply circuit is configured to receive utility power, and the uninterruptible power supply is connected to the power supply circuit and stores backup power. When the utility power is normal, the power supply circuit supplies power to the uninterruptible power supply, and the uninterruptible power supply outputs a first alternating current voltage that meets a utility power specification to the alternating current load. When the utility power is abnormal, the uninterruptible power supply outputs a second alternating current voltage that meets the utility power specification to the alternating current load.