The Design of Marine 24 V DC Uninterruptible Power Supply

2014 ◽  
Vol 536-537 ◽  
pp. 1537-1541
Author(s):  
Juan Xiao
Keyword(s):  
Power Supply ◽  
Short Circuit ◽  
Battery Management ◽  
Single Chip ◽  
Uninterruptible Power Supply ◽  
Management Scheme ◽  
Ac Power ◽  
Actual Use ◽  
Emergency Power ◽  
Uninterruptible Power

A marine DC uninterruptible power supply is designed. The UPS adopts PIC16C73 single-chip microcomputer to realize the battery management. Both AC power and battery power, the output voltage stability in 23 to 24 v.Via advanced battery management, two sections of charging, equalized charging and floating charging can automatic convert and the DCUPS has many functions of protection, such as over-voltage protection ,under voltage protection and short circuit protection.The actual use on the ship and other occasions showed that the DCUPS is convenient and practical,and is more simple, reliable and longer emergency power supply than the traditional AC-DC uninterruptible power supply management scheme.

scholarly journals Fault Loop Impedance Measurement in Circuits Fed by UPS and Principle of Safety Protection

2020 ◽  
Vol 12 (23) ◽  
pp. 10126
Author(s):  
Jacek Katarzyński ◽  
Marek Olesz
Keyword(s):  
Power Supply ◽  
Short Circuit ◽  
Impedance Measurement ◽  
Reference Value ◽  
Short Circuit Current ◽  
Uninterruptible Power Supply ◽  
Safety Protection ◽  
Uninterruptible Power ◽  
Definition Of ◽  
Electrical Installation

This paper indicates a significant problem of uncertainty of fault loop impedance (FLI) measurement in circuits powered from uninterruptible power supply (UPS) (double-conversion AC-DC-AC). The correctly determined value of this impedance, related to the short-circuit current disconnection time and to the reference value, is one of the most important elements that determines the approval of an electrical installation and its receivers for operation. To define the principles of FLI measurement, several hundred measurements of the short-circuit loop impedance in the circuits fed by the UPS, in various UPS operation modes and with various FLI instruments, were made, which allowed for the definition of measurement rules that reduce the error in assessing the effectiveness of protection against electric shock by automatic disconnection of supply. Based on the analysis of voltage and current waveforms recorded during the real short-circuit tests in the circuit fed by the UPS, a proprietary algorithm for determining the short-circuit loop impedance has been proposed.

scholarly journals An efficient and stable single-phase online uninterruptible power supply

2021 ◽  
Vol 252 ◽  
pp. 01043
Author(s):  
Weihao Yuan ◽  
Haifei Chi ◽  
Zhishan Zhu
Keyword(s):  
Power Supply ◽  
Single Phase ◽  
Sine Wave ◽  
Operating Efficiency ◽  
Single Chip ◽  
Constant Frequency ◽  
Uninterruptible Power Supply ◽  
Phase Inverter ◽  
Uninterruptible Power ◽  
Single Phase Inverter

The system is an AC sine wave online uninterruptible power supply designed with STM32F407 as the main controller and full-bridge single-phase inverter as the core technology. The system is based on the STM32F407 single-chip microcomputer, and consists of a rectifier circuit, a BOOST circuit, a PFC power factor correction circuit, and a full-bridge single-phase inverter circuit. When the input of the system is switched between 29V~43V AC power supply and 24V DC power supply, the output voltage can maintain an AC sine wave with constant frequency and amplitude. Experimental data shows that the system has high operating efficiency and excellent stability.

scholarly journals Uninterruptible Power Supply Improves Precision and External Validity of Telomere Length Measurement via qPCR

2020 ◽  
Vol 1 ◽  
Author(s):  
Waylon J. Hastings ◽  
Dan T.A. Eisenberg ◽  
Idan Shalev
Keyword(s):  
Telomere Length ◽  
Power Supply ◽  
External Validity ◽  
High Performance ◽  
Epidemiological Studies ◽  
Storage Conditions ◽  
Amplification Efficiency ◽  
Uninterruptible Power Supply ◽  
Uninterruptible Power ◽  
The Impact

Abstract Technical challenges associated with telomere length (TL) measurements have prompted concerns regarding their utility as a biomarker of aging. Several factors influence TL assessment via qPCR, the most common measurement method in epidemiological studies, including storage conditions and DNA extraction method. Here, we tested the impact of power supply during the qPCR assay. Momentary fluctuations in power can affect the functioning of high-performance electronics, including real-time thermocyclers. We investigated if mitigating these fluctuations by using an uninterruptible power supply (UPS) influenced TL assessment via qPCR. Samples run with a UPS had significantly lower standard deviation (p < 0.001) and coefficient of variation (p < 0.001) across technical replicates than those run without a UPS. UPS usage also improved exponential amplification efficiency at the replicate, sample, and plate levels. Together these improvements translated to increased performance across metrics of external validity including correlation with age, within-person correlation across tissues, and correlation between parents and offspring.

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