Three-Phase AC Power Supply Phase Current Balancing Control
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Solution Overview
Problem
Data processing systems with multiple power supply units face challenges in efficiently managing power distribution from a three-phase AC source, leading to unbalanced phase currents and reduced power output when additional power regulators are added, which can result in catastrophic failures or shutdowns under varying conditions.
Innovation Solution
A control system and method that determines the number of active single-phase power regulators connected in parallel across a three-phase AC source, summing currents, and switching between line balance and maximize power modes based on a predefined threshold to maintain balanced power distribution or increase output as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple single-phase power regulators are connected in parallel across a common phase to increase power output, then power capacity is improved, but phase current balance deteriorates
Solution Approach 1:
The system dynamically switches between two operational modes (line balance mode and maximize power mode) based on the number of active power regulators and load conditions. This dynamic adaptation allows the system to optimize between phase balance and power output rather than being fixed in one configuration
Solution Approach 2:
The control system changes operational parameters (mode of operation) based on the configuration of power regulators and current load demands. By adjusting the operational mode according to system state, the patent resolves the contradiction between maintaining balance and maximizing power
2Reliability
If more than three power regulators are used to provide redundancy and increased power, then reliability is improved, but system complexity increases
Solution Approach 1:
The control system automatically determines the number of active power regulators and selects the appropriate operational mode without requiring manual intervention or complex external control. The system self-adjusts based on its own configuration and operating conditions
Solution Approach 2:
The system uses feedback from current sensing to monitor the operational state and automatically adjusts the mode of operation. This closed-loop control simplifies the management of multiple power regulators by allowing the system to self-regulate based on real-time conditions
3Productivity
If power regulators operate without phase balance control to maximize power output, then productivity is improved, but harmful factors increase due to unbalanced currents
Solution Approach 1:
The system dynamically adapts its operational characteristics based on real-time conditions, switching between balance-oriented and power-oriented modes. This dynamic behavior allows the system to maximize productivity when conditions permit while minimizing harmful unbalanced currents when appropriate
Solution Approach 2:
The patent applies partial phase balancing (not complete balancing at all times) by selectively enabling line balance mode only when beneficial. This partial application of balance control allows the system to achieve sufficient power delivery while avoiding the harmful effects of excessive or unnecessary balancing constraints
Data Source
AI summary
Control of an AC-to-DC power supply assembly fed by a three-phase AC source is provided by: determining whether the power supply assembly includes greater than three single-phase power regulators feeding a common load, with multiple regulators being connected in parallel across a common phase of the AC source, and if so, summing currents provided by the regulators to the common load; and ascertaining whether the summed current is less than a predefined threshold, and if yes, operating the power supply assembly in a line balance mode to maintain power drawn on the phases of the AC source in balance, and if greater than the predefined threshold, operating the power supply assembly in a maximize power mode wherein power is provided to the common load without maintaining power drawn on the phases of the AC source in balance.