Parallel Power Supply Load Sharing Control
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Solution Overview
Problem
Existing load sharing control technologies for parallel power supply modules suffer from large errors and complex implementations, leading to deteriorated load sharing properties and output voltage deviations, making it difficult to maintain output voltages within a control range.
Innovation Solution
A load sharing device that includes a common voltage control signal output unit and output voltage control units to generate and distribute common voltage control signals, detect output currents, and control output voltages within a predetermined range, using a common bus to connect multiple power supply modules and ensure balanced current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional load sharing control methods are used, then the control implementation becomes complex, but the load sharing property deteriorates and output voltage deviations increase
Solution Approach 1:
The control system is segmented into independent modules, each with its own output voltage control unit that operates autonomously based on common voltage control signals. This modular approach simplifies the overall control implementation while improving load sharing accuracy, as each module independently adjusts its output based on voltage deviations detected through the common feedback mechanism.
Solution Approach 2:
The patent implements a feedback mechanism where output voltage control units continuously monitor output voltages and generate common voltage control signals based on detected deviations. This feedback loop enables automatic load sharing adjustment without complex centralized control, improving both the simplicity of implementation and the precision of load sharing by dynamically compensating for voltage variations.
2Reliability
If load sharing control is implemented to improve current distribution, then output voltages may escape from control range, but without control output voltages remain unstable
Solution Approach 1:
The patent applies local quality by implementing individual output voltage control units in each power supply module that independently regulate output voltages according to local voltage deviations. This allows precise control of output voltages within the specified range while maintaining balanced current distribution, as each module adjusts its parameters locally based on real-time voltage feedback without affecting the stability of other modules.
3Reliability
If parallel power supply modules are used to enhance reliability and thermal management, then deviations between modules cause poor load sharing, but with load sharing control the complexity increases
Solution Approach 1:
The patent implements a universal control approach where identical output voltage control units are deployed in each power supply module, allowing the same control mechanism to handle multiple functions: voltage regulation, load sharing, and stability maintenance. This multi-functional design enhances system reliability through standardized modular control while avoiding the complexity of different control strategies for different functions.
Data Source
AI summary
A load sharing device for load balancing among a plurality of power supply modules connected in parallel to a single load includes a common voltage control signal output unit and output voltage control units corresponding to the power supply modules, respectively. The common voltage control signal output unit generates a common voltage control signal from output voltages of the power supply modules and outputs the common voltage control signal to the power supply modules. The output voltage control units detect output currents of the power supply modules and control the output voltages of the power supply modules to be in a predetermined voltage range according to the common voltage control signal and the detected output currents.