UPS Circuit Redundant Inversion Phase Leg for Reliability
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Solution Overview
Problem
Conventional UPS circuits with multi-level inversion phase legs suffer from reduced reliability due to the increased number of semiconductor devices, which affects the overall reliability and efficiency of the power supply.
Innovation Solution
Incorporating a redundant inversion phase leg with a failure detection device and control mechanism to replace failed phase legs, ensuring continuous operation and improving reliability while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-level conversion topology is adopted for inversion phase legs to obtain higher efficiency, then efficiency is improved, but reliability deteriorates due to increased number of semiconductor devices
Solution Approach 1:
A redundant inversion phase leg is pre-configured in the system but remains inactive during normal operation. When a failure is detected in any inversion phase leg, the controller automatically activates the redundant phase leg to replace the failed one, ensuring continuous operation without manual intervention. This preliminary preparation of backup resources resolves the contradiction by enabling high efficiency through multi-level topology while protecting reliability through automated redundancy activation.
Solution Approach 2:
The system dynamically changes the operational status parameter of inversion phase legs from static to dynamic. During normal operation, multiple phase legs work simultaneously for high efficiency. Upon failure detection, the controller changes the state of the redundant phase leg from standby to active, maintaining system functionality. This parameter change approach allows the system to optimize efficiency when possible while ensuring reliability when necessary.
2Productivity
If more semiconductor devices are used in inversion phase legs, then efficiency is improved, but device complexity increases
Solution Approach 1:
The inversion stage is segmented into multiple independent phase legs, each with its own semiconductor devices. This segmentation allows the system to use multi-level conversion topology in each phase leg for high efficiency while isolating the complexity into modular units. The redundant phase leg is also segmented and kept ready to replace any failed phase leg, managing complexity through modularity and independence of each segment.
3Reliability
If redundant inversion phase leg is added to improve reliability, then reliability is improved, but device complexity increases
Solution Approach 1:
The redundant inversion phase leg is designed with universal functionality identical to the primary phase legs. It can replace any failed phase leg regardless of which specific phase fails, making the redundant component multi-functional. This universality improves reliability through redundancy while minimizing the increase in device complexity, as only one additional phase leg is needed to protect against failures in multiple phases.
Data Source
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AI summary
A UPS circuit, comprising a rectification phase leg (PL1) for rectification, which is used for converting a received alternating current into a direct current; inversion phase legs (PL21, PL22, PL23) for inversion, which are used for inverting the direct current output by the rectification phase leg into an alternating current; a failure detection device (D) which is used for detecting whether an inversion phase leg has failed; a redundant inversion phase leg (PL2a), with an input end thereof being connected to an output end of the rectification phase leg; and a control device which is used for receiving a signal sent by the failure detection device and is also used for enabling the redundant inversion phase leg to replace the inversion phase leg which has failed when a failure occurs.