UPS Mode Switching for Power Stability and Battery Life
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Solution Overview
Problem
Existing uninterruptible power supplies (UPS) lack flexibility in switching between on-line and off-line operation modes, as they do not consider the specific power stability requirements of the load device, leading to inefficient power consumption and battery deterioration.
Innovation Solution
A UPS system that includes a rectifier, storage battery, inverter, and a selecting means to choose between on-line and off-line operation modes based on variable criterion values for AC power conditions, allowing for wider range of commercial power supply compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the off-line operation method is used, then power consumption is reduced, but the storage battery deteriorates quickly when commercial power supply quality is poor
Solution Approach 1:
The patent implements dynamic switching between off-line and on-line operation modes based on real-time detection of commercial power supply quality. The system automatically transitions from a static operation mode to a dynamic one that adapts to changing power conditions, thereby reducing battery deterioration when power quality is poor while maintaining low power consumption when power quality is acceptable.
Solution Approach 2:
The system changes the operational parameters of the UPS by switching between different operation modes (off-line and on-line) based on detected power supply conditions. This parameter change allows the system to optimize both power consumption and battery durability by selecting the appropriate mode according to real-time power quality assessment.
2Reliability
If the on-line operation method is used, then stable quality electric power is always supplied to the load device, but power consumption becomes greater due to continuous AC-DC-AC conversion
Solution Approach 1:
The patent employs dynamic mode selection that transitions between on-line and off-line operation based on detected power supply conditions. This dynamic approach allows the system to maintain stable power supply when necessary while avoiding continuous operation in on-line mode, thereby reducing overall power consumption.
Solution Approach 2:
The system changes operational parameters by switching between operation modes based on power quality detection. When power supply stability is sufficient, the system switches to off-line mode to reduce power consumption, while maintaining the capability to switch to on-line mode when stability requirements demand it.
3Reliability
If the on-line operation method is used, then electric power is always supplied from the inverter, but a cooling fan must operate continuously generating noises
Solution Approach 1:
The patent implements dynamic operation mode switching that allows the system to operate in off-line mode when commercial power supply quality is acceptable. This dynamic adjustment eliminates the need for continuous fan operation during off-line mode, thereby reducing noise while maintaining the ability to provide continuous power supply when switching to on-line mode.
4Extent of automation
If the uninterruptible power supply switches operation mode based on error frequency alone, then automatic switching between on-line and off-line modes is achieved, but the load device's power stability requirements are not considered
Solution Approach 1:
The patent applies local quality by introducing load-specific parameters into the mode selection criterion. Different load devices can have different power stability requirements, and the system adjusts the switching criterion accordingly. This allows the automatic switching mechanism to adapt to the specific needs of different load devices, enhancing versatility while maintaining automation.
Solution Approach 2:
The system changes the switching criterion parameter based on the type of load device connected. By incorporating load device characteristics into the decision-making process, the system can automatically adjust its operation mode selection to match the power stability requirements of different loads, thereby improving adaptability.
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 flexible switching between operation modes to accommodate a broader range of commercial power supplies, optimizing power consumption and battery life by considering the load device's stability requirements.
Implementation Method 1
a rectifier for converting AC power supplied from a power source into DC power
Implementation Method 2
a storage battery for storing the DC power converted
Implementation Method 3
an inverter for converting the DC power into AC power
Data Source
AI summary
An uninterruptible power supply is able to switch an operation mode between an on-line operation method and an off-line operation method for a wider range of commercial power supplies. An uninterruptible power supply 1 includes; a rectifier 11 for converting AC power supplied from a commercial power source 2 into DC power; a storage battery 12 for storing the DC power converted; an inverter 13 for converting the DC power into AC power; a selecting means (14 to 18) for selecting one of an off-line operation mode and an on-line operation mode according to a detection result of detecting a condition of the AC power supplied from the power source 2; in the off-line operation mode, AC power supplied from the power source 2 is supplied to a load device 3 under normal operating condition, and when any failure happens in relation to the AC power supplied from the power source 2, the uninterruptible power supply supplies a power output generated by the inverter 13 to the load device 3; in the on-line operation method, a power output from the inverter 13 is supplied to the load device 3 all the time including a period of normal operating condition; and a setup means (19) for variably setting criterion values, with which the selecting means (14 to 18) selects an operation mode depending on the condition of the AC power supplied from the power source 2.