Power Conversion Device Parallel Inverter Control
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Solution Overview
Problem
Existing power conversion devices require multiple microcomputers to calculate AC voltages for multiple inverter circuits, leading to inefficiencies and increased costs, with no effective method for reducing the number of calculation devices while maintaining reliability and efficiency.
Innovation Solution
A power conversion device with multiple inverter circuits connected in parallel, utilizing a single microcomputer and signal selection units that choose between two transmission paths to drive signals to the inverter circuits, allowing for reduced microcomputer count and enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple microcomputers are used to calculate AC voltages for multiple inverter circuits, then calculation accuracy and control precision are maintained, but device complexity and cost increase
Solution Approach 1:
Multiple microcomputers are merged into a single microcomputer that centrally calculates AC voltage values for all inverter circuits. The single microcomputer generates drive signals that are distributed to multiple signal selection units, each controlling an inverter circuit, thereby reducing device complexity while maintaining calculation accuracy.
Solution Approach 2:
A single microcomputer is designed to perform multiple functions by calculating AC voltage values for multiple different inverter circuits. The microcomputer serves as a universal control device that can generate drive signals for various inverter configurations, eliminating the need for dedicated microcomputers for each inverter circuit.
2Reliability
If multiple microcomputers are used for inverter control, then system reliability is improved through redundancy, but manufacturing cost increases
Solution Approach 1:
Signal selection units are introduced as intermediary components between the single microcomputer and the inverter circuits. These signal selection units receive drive signals from the microcomputer and can select between different signal sources, providing redundancy and reliability without requiring multiple microcomputers, thus reducing manufacturing cost.
Solution Approach 2:
The system incorporates redundant signal paths and signal selection units that can switch to alternative signals if a failure occurs. This beforehand cushioning ensures continuous operation and maintains reliability while using a single microcomputer, avoiding the need for expensive redundant microcomputers.
3Adaptability or versatility
If multiple microcomputers are deployed for parallel inverter control, then control independence is achieved, but device miniaturization becomes difficult
Solution Approach 1:
The control system is segmented into a central microcomputer and distributed signal selection units. The microcomputer performs centralized calculation, while signal selection units are distributed to each inverter circuit, providing control independence at the execution level while keeping the overall device volume small through consolidation of the calculation function.
Solution Approach 2:
The system architecture transitions from horizontal distribution of multiple microcomputers to a vertical hierarchy with a single microcomputer at the top and multiple signal selection units at the bottom. This dimensional change allows control independence to be achieved through signal distribution rather than through multiple independent processing units, enabling miniaturization.
Data Source
AI summary
An object of the present invention is to provide a power conversion device including a plurality of inverter circuits connected in parallel to a load, the power conversion device being capable of performing control with a smaller number of microcomputers, having high reliability, and being advantageous for miniaturization and cost reduction. Provided are: a plurality of inverter circuits connected in parallel to a load; a microcomputer which controls the plurality of inverter circuits; a plurality of signal selection units which select a drive signal of each of the plurality of inverter circuits; and a first transmission path and a second transmission path which are connected in parallel between the microcomputer and the plurality of signal selection units and transmit the drive signal of each of the plurality of inverter circuits from the microcomputer to each of the plurality of signal selection units. Each of the plurality of signal selection units selects any one of a first drive signal transmitted from the first transmission path and a second drive signal transmitted from the second transmission path.