UPS Bypass Relay Mechanical Overdrive for Fast Mode Switching
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Solution Overview
Problem
Uninterruptible Power Supplies (UPS) experience power starvation during mode switching from one power source to another, leading to prolonged downtime and potential load disruption.
Innovation Solution
The implementation of a bypass relay with a mechanical overdrive and a controller that generates non-sinusoidal inverter commands for a short period, followed by sinusoidal commands to quickly transition between power delivery modes, reducing the time required for switching and ensuring continuous power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional bypass relay is used for mode switching, then the switching mechanism is simple, but the switching time is prolonged causing power starvation
Solution Approach 1:
The bypass relay incorporates a mechanical overdrive mechanism that dynamically assists the armature movement during switching. This mechanical assistance provides additional force to accelerate the armature's transition between contacts, reducing switching time without requiring a complete redesign of the relay structure.
Solution Approach 2:
The mechanical overdrive mechanism pre-positions and pre-accelerates the armature before the actual switching event. By preparing the moving part in advance with stored mechanical energy, the relay achieves faster switching response when the switching signal is received.
2Reliability
If the inverter uses standard sinusoidal commands during mode transition, then the control is stable, but the transition time is extended
Solution Approach 1:
The inverter control system changes the waveform parameter from sinusoidal to square wave during the mode transition period. This parameter change allows the inverter to respond more quickly to switching commands while still maintaining reliable power delivery to the load. After transition completes, the waveform returns to sinusoidal for normal operation.
Solution Approach 2:
The controller implements a time-based periodic strategy where different waveform types are applied at different stages of the transition process. A square wave is used temporarily during the critical transition window, then switched back to sinusoidal wave for stable operation, creating a structured multi-phase transition sequence.
3Productivity
If the bypass relay armature moves slowly, then the mechanical stress is reduced, but the switching time increases causing load disruption
Solution Approach 1:
The mechanical overdrive mechanism enables the armature to rapidly skip through the critical switching distance in a controlled manner. The overdrive provides a brief burst of accelerated movement that gets the armature through the transition quickly, then normal operation resumes at reduced speed to minimize mechanical stress.
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 solution significantly reduces the time needed for power delivery mode changes, minimizing downtime and ensuring uninterrupted power to the load by employing a bypass relay with a mechanical overdrive and strategic inverter command generation.
Implementation Method 1
bypass relay with a mechanical overdrive
Implementation Method 2
a spring coupled to the moveable armature, the spring constructed to hold the movable armature in the first state against an opposing magnetic field
Data Source
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AI summary
According to one aspect, an uninterruptable power supply (UPS) is provided. The UPS includes a first input constructed to receive input power from a first power source, a second input constructed to receive input power from a second power source, an output constructed to provide output alternating current (AC) power derived from at least one of the first power source and the second power source, a bypass switch having an on state and an off state coupled between the first input and the output, an inverter coupled between the second input and the output and constructed to generate the output AC power. The UPS being constructed to quickly transition from a first power delivery mode that provides output power derived from the first power source to a second power delivery mode that provides output power derived from the second power source.