Three-Phase Automatic Transfer Switch Independent Phase Segmentation
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Solution Overview
Problem
Three-phase automatic transfer switches (ATSs) experience a longer energy gap during power source transitions, leading to complete power loss and equipment shutdowns due to their slower switching times, which is not tolerable for modern data centers with increased power demands.
Innovation Solution
A three-phase to single-phase automatic transfer switch system with three pairs of switches and a programmable controller that allows independent switching of each pair to the secondary power source, reducing the energy gap to approximately 7-9 milliseconds, similar to single-phase ATS systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a three-phase ATS is used to provide power redundancy for high-density racks, then the power capacity is sufficient to meet the increased power demands, but the switching time is too long (16-20 milliseconds) causing complete power loss and equipment shutdown
Solution Approach 1:
The patent divides the three-phase power switching system into three independent single-phase switching modules, each handling one phase. Each module can switch independently with a shorter switching time (7-9 milliseconds), preventing complete power loss while still providing three-phase power capacity.
2Reliability
If a traditional three-phase ATS switches all phases simultaneously, then the power redundancy is maintained, but the energy gap is too long (16-20 milliseconds) causing servers to lose power completely
Solution Approach 1:
The system segments the three-phase switching into three independent single-phase switching operations. Each phase switches independently with a duration of 7-9 milliseconds, reducing the energy gap from 16-20 milliseconds to 7-9 milliseconds while maintaining power redundancy through the secondary three-phase source.
3Speed
If the switching speed is increased to reduce the energy gap, then the power continuity is improved, but the complexity of coordinating multiple phase switches increases
Solution Approach 1:
The patent segments the control system into three independent controllers, one for each phase. Each controller independently manages its phase switching without complex coordination with other phases, simplifying the control architecture while achieving faster switching speeds of 7-9 milliseconds per phase.
Solution Approach 2:
Each phase has its own independent switching module with locally optimized switching characteristics. This allows each phase to be controlled independently with appropriate timing and parameters, reducing the overall system complexity while maintaining fast switching performance.
Data Source
AI summary
A three phase to single phase automatic transfer switch for providing power to at least one single phase power load from one of a primary and a secondary source of three phase power. The automatic transfer switch includes three pairs of switches, wherein each pair of switches is connectable to the primary and the secondary sources of three phase power, wherein each switch operates in unison with the other switch within its pair, wherein each pair of switches is connectable to a different one of the at least one single phase power load, and wherein each pair of switches is operable independently of the other pairs of switches. The three phase to single phase automatic transfer switch also includes one or more controller in communication with each of the pairs of switches, the controller configured so that, when power from the primary source of three phase power is lost or degraded, the controller connects each pair of switches independently of each of the other pairs of switches from the primary to the secondary source of three phase power.