AVR Transformer Core Isolation for UPS Energy Loss Reduction
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Solution Overview
Problem
Automatic voltage regulation (AVR) transformers in uninterruptible power supplies (UPS) consume energy even when not regulating output voltage, leading to energy losses.
Innovation Solution
The AVR transformer core is de-energized and isolated from the neutral line when not performing a regulation function, using a bypass switch and controller to manage the transformer's operation modes and prevent unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AVR transformer remains energized to provide continuous voltage regulation capability, then the UPS can respond quickly to voltage sags and swells, but energy losses occur in the transformer core even when regulation is not needed
Solution Approach 1:
The patent applies dynamics by making the transformer core energization state changeable based on operating conditions. The controller dynamically switches the core between energized and de-energized states using bypass switches, allowing the system to adapt between quick response mode (energized) and energy-saving mode (de-energized), resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent implements periodic action through controlled energization cycles. Instead of continuous energization, the core is periodically energized only when voltage regulation is actually needed, with the controller monitoring input voltage conditions and activating the core temporarily during sag or swell events, then de-energizing it again to prevent continuous energy losses.
2Loss of energy
If the AVR transformer core is de-energized to eliminate tare losses, then energy efficiency improves, but the response time to voltage disturbances increases
Solution Approach 1:
The patent applies preliminary action by maintaining the capability for quick response through the bypass switch configuration and control circuitry readiness. Even when the core is de-energized to save energy, the control system remains prepared to quickly re-energize the core or activate alternative regulation paths when voltage disturbances are detected, ensuring minimal response time penalty.
3Loss of energy
If bypass switches are added to control core isolation, then energy losses are reduced, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the bypass switches and control circuitry to serve multiple functions: isolating the core for energy saving, providing alternative current paths during regulation operations, and enabling different operating modes (continuous regulation, on-demand regulation, energy-saving mode). This multi-functionality justifies the added complexity by delivering multiple benefits from the same components.
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 approach reduces energy losses by preventing electric current flow through the AVR transformer core when it is not regulating, thereby eliminating tare losses and ensuring efficient power supply.
Implementation Method 1
the bypass switch to isolate the core of the AVR transformer from the neutral line
Data Source
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AI summary
Aspects of the invention are directed to systems and method for limiting losses in an uninterruptible power supply. In one aspect, the present invention provides an uninterruptible power supply (UPS) (10) comprising an input (12) to receive input power having an input voltage, an output (14) to provide output power having an output voltage, a neutral line, an automatic voltage regulation (AVR) transformer (20) coupled to the input (12) and the output (14) of the UPS (10) and having an input, an output, a core and at least one switch controllably coupled to at least one of the core, the input and the output, and a means (34) for isolating the core of the AVR transformer (20) from the neutral line when the input voltage is substantially equal to a defined output voltage.