Matrix Rectifier Phase Fault Handling
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Solution Overview
Problem
Matrix rectifiers face challenges in maintaining output voltage and delivering continuous power when one input phase is disconnected or short-circuited due to the lack of intermediate storage energy and low-tolerance output-voltage regulation in existing designs.
Innovation Solution
A power supply circuit with a matrix converter that includes bi-directional switch pairs and a transformer, allowing for zero voltage switching (ZVS) and phase-shifted operation to maintain output voltage and deliver power when one input phase is disconnected or short-circuited, using a buck-type converter and a controller to regulate the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard two-stage approach with front-end PFC rectifier and isolated DC-DC converter is used, then output voltage regulation and continuous power delivery are maintained, but power density and efficiency are reduced
Solution Approach 1:
The patent combines the PFC rectifier and DC-DC converter into a single-stage isolated matrix-type rectifier that performs both functions simultaneously. The matrix converter structure integrates the rectification and isolation functions, eliminating the need for separate two-stage conversion while maintaining output voltage regulation and continuous power delivery capability.
Solution Approach 2:
The matrix converter is designed to perform multiple functions including PFC, isolation, and voltage regulation in a single device. The bi-directional switch pairs and multi-phase structure enable the converter to handle various operating conditions and perform both rectification and DC-DC conversion functions simultaneously, achieving high power density without sacrificing reliability.
2Productivity
If a single-stage isolated matrix-type rectifier is used to achieve high power density and efficiency, then power density and efficiency are improved, but the ability to maintain output voltage and deliver continuous power when one input phase is disconnected deteriorates
Solution Approach 1:
The patent implements dynamic switching control of bi-directional switch pairs based on the operational status of input phases. When one phase is disconnected or short-circuited, the controller dynamically reconfigures the switch pairs to operate in different modes, enabling the system to adapt to fault conditions and maintain continuous power delivery while preserving high power density characteristics.
Solution Approach 2:
The controller changes operational parameters including switching patterns and phase configurations when fault conditions are detected. By modifying the switching states of bi-directional switch pairs and adjusting the operational mode of the matrix converter, the system maintains output voltage stability and continuous power delivery capability even when operating with reduced input phases.
3Device complexity
If low-tolerance output-voltage regulation is used in existing matrix rectifier designs, then device complexity is reduced, but the ability to maintain output voltage when one input phase is disconnected deteriorates
Solution Approach 1:
The patent incorporates feedback control mechanisms that continuously monitor output voltage and adjust the switching states of bi-directional switch pairs accordingly. The controller uses feedback information to detect faults and dynamically reconfigure the matrix converter operation, maintaining output voltage stability even under fault conditions without requiring overly complex control schemes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous operation and delivery of about two-thirds of total power to the output load while maintaining output voltage stability during phase disconnection or short-circuit conditions, reducing losses and ensuring reliable power supply.
Implementation Method 1
the second and the fifth bi-directional switch pairs are turned off, and, in each of the first, third, fourth, and sixth bi-directional switch pairs, one of the first and second uni-directional switches are turned on and the other of the second and first uni-directional switches are operated as a full-bridge phase-shifted converter
Implementation Method 2
a transformer including a primary side electrically connected to the single primary phase
Implementation Method 3
a rectifier electrically connected to a secondary side of the transformer
Data Source
AI summary
A power supply circuit includes a matrix converter that converts a first to third input alternating current (AC) phases into a single primary phase, a transformer including a primary side electrically connected to the single primary phase, a rectifier electrically connected to a secondary side of the transformer, and an output voltage terminal electrically connected to the rectifier. The matrix converter includes first through sixth bi-directional switch pairs, and each of the first through sixth bi-directional switch pairs includes first and second uni-directional switches. When the third input AC phase is disconnected or short circuited, the second and the fifth bi-directional switch pairs are turned off, and, in each of the first, third, fourth, and sixth bi-directional switch pairs, one of the first and second uni-directional switches are turned on and the other of the second and first uni-directional switches are operated as a full-bridge phase-shifted converter.