Sensorless Model Predictive Control of Single-Phase Inverter for UPS Applications via Accurate Load Current Estimation.

Single-phase inverters with an output LC filter, can generate low distortion output voltages, which are suitable for uninterruptible power supply (UPS) systems. The UPS system provides emergency power in the case of utility power failure, requiring high reliability and clean power. The sensorless control method is actually a soft-sensing technique, that reduces system cost, measurement-related losses, and, especially important for UPS systems, enhances the system reliability. This paper proposes a load current sensorless finite control set model predictive control (FCS-MPC) scheme for a single-phase UPS inverter. A time varying observer is proposed, which offers the accurate estimation for individual components simultaneously in periodic load current signal, without subsequent complex calculations. Compared with another two typical sensorless methods (the low-pass filter and the Kalman filter), the proposed observer-based FCS-MPC strategy has smaller load current estimation error and lower output voltage distortion, under both linear and nonlinear loads. The theoretical analysis is verified through simulation and experiment. A single-phase inverter rapid control prototype (RCP) is set up with the Speedgoat real-time target machine, to confirm the effectiveness of the system.

Comparative Analysis of Modulation Techniques on the Losses and Thermal Limits of Uninterruptible Power Supply Systems.

This paper presents a comparative analysis of electrical losses and subsequent thermal limits of the inverter of UPSs for small office and home office (SOHO) applications. For this, three PWM modulation techniques applied to the full-bridge converter are considered, with power levels of 100-1000 W and switching frequencies of 30-120 kHz. To validate the electrical and thermal models, a dSapce MicroLabBox equipment was used to implement modulation techniques on a commercial 1000 W UPS, and a Keysight DAQ970A data logger was used for temperature measurements. As a result, the MOSFET temperatures and losses are obtained for the three modulation techniques evaluated, indicating the best scenario for use and its influence on the UPS autonomy time.

Design and Development of a Battery State of Health Estimation Model for Efficient Battery Monitoring Systems.

An uninterruptible power supply (UPS) is a device that can continuously supply power for a certain period when a power outage occurs. UPS devices are used by national institutions, hospitals, and servers, and are located in numerous public places that require continuous power. However, maintaining such devices in good condition requires periodic maintenance at specific time points. Efficient monitoring can currently be achieved using a battery management system (BMS). However, most BMSs are administrator-centered. If the administrator is not careful, it becomes difficult to accurately grasp the data trend of each battery cell, which in turn can lead to a leakage or heat explosion of the cell. In this study, a deep-learning-based intelligent model that can predict battery life, known as the state of health (SoH), is investigated for the efficient operation of a BMS applied to a lithium-based UPS device.

The introduction of an emergency safety protocol coupled with simulation training in robotic surgery, has enabled a more cohesive and efficient response to emergencies.

With the increasing popularity of robotic surgery, arise a unique set of challenges. In-order to minimise the risk and optimise patient safety, teams need to anticipate these, plan and train to improve familiarity with the nuances of robotic surgery. Human factors and simulation training (ST) are now an integral part of surgery and we have extended these principles to our robotic practice. From our experience with emergencies and a thorough debrief, we have realised the importance of an emergency safety protocol (ESP) for the undocking of the robot, and how training with the correct systems in place optimises our non-technical skills and improves our efficiency. This protocol is used across all robotic specialties allowing for clear communication, situational awareness and role clarity, thereby reducing errors in a high-pressured environment. We aim to share our protocol, highlight the importance of ST and show that coupling of the ESP with ST, including addressing a disrupted power supply and how to avoid the resulting loss of image capture, is where our paper contributes to the current literature. There is a paucity in the literature regarding emergency undocking, and also techniques for avoiding power interruptions, for which we utilise the Uninterruptible Power Supply (UPS) system. By sharing experiences and systems used, we create an opportunity that will result in a culture of shared learning in the robotic community, thereby encouraging other robotic teams to review their protocols and training practices and adapt as necessary.

[Risk Control of UPS Power Supply for Medical Equipment].

OBJECTIVE: Putting forward that the risk of using UPS for medical matching is easy to be ignored by managers. METHODS: The method of UPS inspection was designed and used in hospital. RESULTS: The qualified rate of UPS for equipment matching was 66.7% and the problems were corrected. Based on the Internet of Things technology, the UPS monitoring technology was prospected. CONCLUSIONS: It is effective to control the risk of UPS by recognizing the risk of using UPS and specifying the strategy.

MicroMI: A portable microbiological mobile incubator that uses inexpensive lithium power banks for field microbiology.

Incubation at controlled temperature is a key step in culture based microbiological tests. Access to culture-based microbiological testing requires access to conventional incubators in a laboratory. Portable incubators allow microbiological testing in the field and in resource-limited settings, and can eliminate the challenge of sample transportation, minimising the chance of sample degradation. Recent studies have reported low-cost portable incubator designs suitable for field or off-grid use, but these either need an external power supply (e.g. mains AC or 12 V DC), or rely on passive heating without thermostatic control. Here we report that small inexpensive uninterruptable power supply (UPS) products manufactured for consumer electronics and powered by lithium-ion battery packs allowing thermostatic temperature control in small portable incubators that can maintain precise temperatures with or without external power. We present an open-source design for a Microbiological Mobile Incubator (MicroMI) in two sizes for field use. The MicroMI is built from simple and widely available components and is easy to set up. The open source design can be customised for different numbers of samples. The smallest and most efficient design uses a vacuum insulated food flask that allows longer operation with smaller, lower capacity UPS. The larger flight case design has space for more samples, but depletes the battery faster. The UPS maintains a typical microbiology incubation temperature for up to 24 h without external power- ideal for typical incubation needed for culture methods. The battery capacity, incubator design, and external ambient temperature all affected duration of operation without requiring external power. We validated the MicroMI by conducting classical microbiological tests using agar petri dishes, slant cultures and dip slides, and biochemical tests. We conclude the MicroMI design allows inexpensive lithium battery products to be used to simplify field microbiology and increase access to vital analytical microbiology testing.

Risk Control of UPS Power Supply for Medical Equipment / 中国医疗器械杂志

OBJECTIVE@#Putting forward that the risk of using UPS for medical matching is easy to be ignored by managers.@*METHODS@#The method of UPS inspection was designed and used in hospital.@*RESULTS@#The qualified rate of UPS for equipment matching was 66.7% and the problems were corrected. Based on the Internet of Things technology, the UPS monitoring technology was prospected.@*CONCLUSIONS@#It is effective to control the risk of UPS by recognizing the risk of using UPS and specifying the strategy.

Discussion on How to Equip Backup Power for Medical Equipment in Hospital / 医疗卫生装备

Backup power should be equipped in hospitals in order to prevent the medical risks.At present,there are three choices of the backup power including UPS,EPS and diesel generator.The principles of three backup powers are introduced.Methods for equipping backup power are also discussed to guarantee the security of power supply system for emergency medical equipment.