Parallel Power Converter Current Compensation Without Extra Hardware
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Solution Overview
Problem
Conventional current control systems require additional hardware for high accuracy, leading to increased complexity and inflexibility, making it difficult to integrate them into existing systems or products.
Innovation Solution
A current control device utilizing a current sensor and error compensator to achieve high current control accuracy without additional hardware, using a software or firmware module that samples current and generates compensation values to control power conversion units, allowing for flexible installation and low cost operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an additional power circuit is used to generate compensation current, then current control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces the traditional hardware-based additional power circuit with a software/firmware-based error compensator. The error compensator calculates compensation values through digital computation rather than physical circuit operations, thereby achieving current error compensation without increasing hardware complexity. This substitution of mechanical/electrical system with a computational system resolves the contradiction between improving current control accuracy and avoiding increased device complexity.
2Measurement precision
If an additional power circuit is installed, then current control accuracy is improved, but adaptability decreases
Solution Approach 1:
The patent implements a dynamic error compensator that can be flexibly installed or removed through software/firmware updates without physical hardware modifications. The error compensator adapts to different power conversion unit configurations and can be dynamically adjusted to meet varying current control requirements. This dynamic, software-based approach enables the system to maintain high current control accuracy while preserving adaptability and installation flexibility.
3Measurement precision
If an additional power circuit is used, then current control accuracy is improved, but cost increases
Solution Approach 1:
The patent employs a software/firmware-based error compensator that incurs minimal additional manufacturing cost compared to hardware-based solutions. The error compensator utilizes existing processing resources within the power conversion unit, avoiding the need for additional physical components. This approach achieves high current control accuracy while keeping manufacturing costs low, as software updates are significantly cheaper than hardware modifications.
Data Source
AI summary
A current control device and a power conversion system employing the current control device are provided. The current control device controls N power conversion unit(s), where N is a positive integer. The N power conversion units are connected in parallel when N is greater than 1. Each power conversion unit includes a signal input terminal and a current-controlled output terminal electrically connected to an external circuit. The current control device includes a first current sensor and an error compensator. The first current sensor samples a current flowing through the external circuit and acquires a sampling value. The error compensator receives the sampling value and a reference value and generates a compensation value accordingly, and outputs N current command(s) to the N power conversion unit(s) respectively according to the reference value and the compensation value.