Parallel DCDC Power Supply Control for Converter Load Balancing
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Solution Overview
Problem
Existing parallel power supply devices with DCDC converters experience significant power imbalances due to varying output voltage values, leading to disproportionate loads on some converters and potential overheating.
Innovation Solution
A parallel power supply device with individual and common output voltage sensors, current sensors, and a control device that performs switching control based on common output voltage, output voltage command, and control current values to equalize output power among converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple DCDC converters are connected in parallel to increase power supply capacity, then the overall power output is improved, but significant power imbalances occur due to varying output voltage values causing disproportionate loads on individual converters
Solution Approach 1:
The patent implements a feedback control mechanism where the control device continuously monitors individual output voltage values from each DCDC converter and adjusts switching control parameters accordingly. This feedback loop equalizes the output power distribution among parallel-connected converters by detecting voltage deviations and correcting them through adaptive switching control, preventing disproportionate load allocation while maintaining high overall power output capability
2Device complexity
If switching control is performed based only on individual output voltage values, then control simplicity is maintained, but accurate power equalization cannot be achieved due to lack of common reference voltage information
Solution Approach 1:
The patent introduces a common reference voltage as an intermediary element that all DCDC converters use for their switching control decisions. This common reference voltage serves as a shared benchmark that enables each converter to compare its individual output voltage against a unified standard, facilitating accurate power equalization without requiring complex inter-converter communication or control coordination mechanisms
3Device complexity
If no common output voltage sensor is used, then device complexity is reduced, but power imbalance detection and correction become inaccurate without a unified voltage reference
Solution Approach 1:
The patent merges the voltage measurement function by implementing a single common output voltage sensor that provides a unified voltage reference for all DCDC converters. This consolidated sensing approach replaces what would otherwise require multiple individual voltage sensors per converter, reducing overall device complexity while simultaneously improving measurement precision by providing a consistent reference point that enables accurate power imbalance detection and correction across the parallel converter system
Data Source
AI summary
Each of the power conversion devices of a parallel power supply device includes an individual output voltage sensor detecting an individual output voltage value, a current sensor that detects a control current value, and a control device. A system to which the parallel power supply device is applied includes a common output voltage sensor detecting a common output voltage value that is a voltage value between high- and low-potential output paths. The parallel power supply device is configured so that the detected common output voltage value, an output voltage command value common for each of the power conversion devices, and an output power command value common for each of the power conversion devices are inputted into the control device. The control device performs a switching control based on the inputted output voltage command value, individual output voltage value, control current value, output power command value, and common output voltage value.