Uninterruptible Power Supply Parallel Switching Efficiency
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Solution Overview
Problem
The existing power supply systems with multiple uninterruptible power supplies operating in parallel suffer from inefficiencies, leading to impaired system performance.
Innovation Solution
A power supply system where each uninterruptible power supply includes a power unit and a switch, with a control unit selecting one supply to be active and setting its switch to the on state, while the others remain in a standby or off state, ensuring only one supply is actively connected to the load, thereby reducing inefficiencies and electric cross currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple uninterruptible power supplies operate in parallel to increase capacitance and improve reliability, then the system reliability is improved, but the system efficiency deteriorates due to unnecessary power usage and complex control requirements
Solution Approach 1:
The system dynamically switches between parallel operation mode (when reliability is prioritized) and single-unit operation mode (when efficiency is prioritized). The control unit selectively activates one or more power supplies based on load requirements and system state, transitioning between operational configurations to optimize the trade-off between reliability and efficiency.
Solution Approach 2:
The system changes the operational parameter of power supply activation from a fixed parallel state to a variable state where the number of active power supplies is adjusted based on conditions. By modifying the activation status of individual power supplies (on/off states), the system adapts its configuration to balance reliability needs against energy consumption.
2Quantity of substance
If multiple uninterruptible power supplies operate in parallel, then the capacitance is increased, but the system complexity increases due to control circuits and current sensors
Solution Approach 1:
The invention extracts and eliminates unnecessary control components from the parallel power supply system. By removing current sensors and complex control circuits that were required for traditional parallel operation, the system achieves capacitance multiplication through simple switching mechanisms without the associated complexity overhead.
Solution Approach 2:
The system replaces expensive and complex control electronics (current sensors, synchronous control circuits) with simpler, more economical switching elements. The switches act as disposable or replaceable components that provide the necessary control function without requiring sophisticated monitoring or adjustment mechanisms.
3Power
If multiple uninterruptible power supplies operate in parallel, then the power supply capacity is increased, but harmful electric cross currents are generated between the power supplies
Solution Approach 1:
The invention extracts and eliminates the source of electric cross currents by preventing simultaneous operation of multiple power supplies. By using switches to isolate power supplies from each other, the system removes the electrical pathways that would otherwise allow harmful circulating currents to develop between parallel-connected units.
Solution Approach 2:
The switch acts as an intermediary element between multiple power supplies and the load. This intermediary component controls the connection state, allowing one power supply to operate at a time while preventing direct electrical interaction between parallel power supplies, thereby eliminating cross current generation.
Data Source
AI summary
A power supply system includes a plurality of uninterruptible power supplies provided for a load in parallel. The uninterruptible power supplies each include a power supply unit configured to supply the load with power and being larger in capacitance than the load, and a switch provided between the power supply unit and the load. The power supply system further includes a control unit selecting a first uninterruptible power supply of the plurality of uninterruptible power supplies, and setting the switch of the first uninterruptible power supply to the on state.