Matrix Converter Solid-State Circuit Breaker Integration
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Solution Overview
Problem
Matrix converters require external circuit breakers or fuses for protection, which increase cost and complexity in electric motor systems.
Innovation Solution
Integration of solid-state transistors and a control circuit within the matrix converter to detect faults and control switches, providing both power conversion and circuit protection functionality, eliminating the need for external circuit breakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external circuit breakers or fuses are added for circuit protection, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the circuit breaker functionality with the matrix converter by integrating solid state transistors and control circuits within the matrix converter structure. The matrix of switches serves dual purposes: power conversion and circuit protection, eliminating the need for separate external circuit breakers or fuses.
Solution Approach 2:
The matrix of switches in the matrix converter is designed to perform multiple functions: AC-AC power conversion and circuit protection. The control circuit monitors current through sensors and can open switches to prevent power flow during fault conditions, making the power conversion device itself provide protective functions previously requiring separate components.
2Reliability
If external circuit breakers or fuses are added for circuit protection, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The circuit breaker functionality is merged into the matrix converter structure, eliminating the need to manufacture and install separate circuit protection components. This integration reduces the total bill of materials and assembly costs while maintaining protective functionality.
Solution Approach 2:
The matrix converter is designed as a multi-functional device that provides both power conversion and circuit protection. This universality reduces the total component count and system complexity, leading to lower manufacturing costs compared to systems requiring separate protection devices.
3Reliability
If external circuit breakers or fuses are added for circuit protection, then circuit protection is improved, but installation complexity increases
Solution Approach 1:
The protective circuit breaker functions are combined within the matrix converter housing and control system. Current sensors are integrated into the power circuit, and the control circuit uses existing switch control mechanisms to implement protection, eliminating the need for separate installation of external protection devices and their associated wiring.
Data Source
AI summary
A matrix converter includes one or more current sensors structured to sense current flowing through the matrix converter, a matrix of switches including a number of solid state transistors, and a control circuit structured to detect faults in power flowing through the matrix converter based on the sensed current, to control the matrix of switches to drive an external device, and to control the matrix of switches to switch to prevent power from flowing internal to the matrix converter, or external to the external device in response to detecting a fault in power flowing through the matrix converter.