• Title/Summary/Keyword: Single switch

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On/off Switch Mediated by Exo+ Polymerases: Experimental Analysis for Its Physiological and Technological Implications

  • Zhang, Jia;Chen, Lin-Ling;Guo, Zi-Fen;Peng, Cui-Ying;Liao, Duan-Fang;Li, Kai
    • BMB Reports
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    • v.36 no.6
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    • pp.529-532
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    • 2003
  • The potential physiological role and technological application of the premature termination of DNA polymerization through the off-switch of exo+ polymerases were studied using 3' phosphorothioate-modified or unmodified primers with single base mismatch distal to the 3' terminus. With exonuclease-digestible unmodified primers, a gradient premature termination of DNA polymerization was observed when amplified with exo+ polymerases. With 3' allele specific phosphorothioate-modified primers, an efficient off-switch effect occurred in the discrimination of a single nucleotide polymorphism when directly using genomic DNA. Clearly, the off-switch of exo+ polymerases is useful in biomedical research.

Design of a Switchplexer Based on a Microstrip Ring Resonator with Single-Switch Operation

  • Park, Wook-Ki;Ahn, Chi-Hyung;Kim, In-Ryeol;Oh, Soon-Soo
    • Journal of electromagnetic engineering and science
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    • v.16 no.1
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    • pp.29-34
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    • 2016
  • This paper proposes a reconfigurable microstrip diplexer, also known as a switchplexer, for use with single-switch operation of frequency band and output path. The proposed switchplexer is composed of a rectangular ring resonator and a switch on a shorting pin, which is inserted between the ring resonator and the ground plane. The rotated main current distributions occurring at different switch statuses provide the diplexer's different operating bands and different output ports. The performance of the simply designed switchplexer is successfully demonstrated via simulation and measurement.

A New High Efficiency PWM Single-Switch Isolated Converter

  • Park, Ki-Bum;Kim, Chong-Eun;Moon, Gun-Woo;Youn, Myung-Joong
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.289-292
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    • 2007
  • The flyback converter is one of the most attractive isolated converters in small power applications because of its simple structure. However, it suffers from high device stress, large transformer size, and high voltage stress across switch and diode. To solve these problems a new cost-effective PWM single-switch isolated converter is proposed. The proposed converter has no output filter inductor, reduced voltage stress on the secondary devices, and reduced transformer size. Moreover, the switch turnoff loss is reduced and no dissipative snubber across the secondary diode is required. Therefore, it features a simple structure, low cost, and high efficiency. The operational principle and characteristics of proposed converter are presented compared with flyback converter and verified experimentally.

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An Efficient Pulse Width Measurement Method using Multiphase Clock Signals for Capacitive Touch Switches

  • Seong, Kwang-Su
    • Journal of Electrical Engineering and Technology
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    • v.8 no.4
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    • pp.773-779
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    • 2013
  • We propose an efficient method to measure a pulse width using multiphase clock signals generated from a ring oscillator. These clocks, which have the same frequency and are evenly spaced, give multiple rising edges within a clock cycle. Thus, it is possible to measure a pulse width more accurately than with existing single clock-based methods. The proposed method is applied to a capacitive touch switch. Experimental results show that the capacitive touch switch with the proposed method gives a 118 fF resolution, which is 6.4 times higher than that of the touch switch with a single clock-based pulse width measurement method.

Cost-Effective Single Switch Multi-Channel LED Driver

  • Hwang, Sang-Soo;Hwang, Won-Sun;Han, Sang-Kyoo
    • Journal of Power Electronics
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    • v.15 no.2
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    • pp.319-326
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    • 2015
  • In this paper, a cost-effective single switch multi-channel LED (light emitting diode) driver is proposed. While conventional LED drivers require as many non-isolated DC/DC converters as the number of LED channels, the proposed LED driver needs only one power switch and several balancing capacitors instead of expensive non-isolated DC/DC converters. Therefore, the proposed driver features a simpler structure, with a lower cost and a higher efficiency. Because its power switch can be turned off under the zero current switching condition, it has very desirable advantages such as improved electromagnetic interference characteristics and high efficiency. Moreover, it uses only a small number of DC blocking capacitors with no additional active devices for the current balancing of multi-channel LEDs. As a result, the proposed driver exhibits high reliability and is cost effective. To confirm the validity of the proposed driver, a theoretical analysis is performed, and design considerations and experimental results obtained from a prototype that is applicable to a 46" LED-TV are presented.

The Starting Characteristics of Single-Phase Induction Motor Using Sequence Controller (순서접속제어에 의한 단상유도전동기의 기동특성)

  • 박수강;성경민;조금배;오금곤;백형래;박해암
    • Proceedings of the KIPE Conference
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    • 1996.06a
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    • pp.76-79
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    • 1996
  • The most common for starting a single phase induction motor is to install a starting condenser and a centrifugal switch in series with the auxiliary winding. Though this method is simple, life of single phase induction motor is short because of malfunction of a starting condenser and a centrifugal switch and efficiency improvement has limitation. In this paper, the starting characteristics of SPIM is improved by sequence voltage control strategy of auxiliary winding in removing a starting condenser and a centrifugal switch. Finally, the excellent starting performance of SPIM is shown through simulation and experimental results.

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A Study on the Soft Starting Switch of Single Phase Condenser Induction Motor Using TRIAC (트라이액을 이용한 단상 유도전동기의 Soft Starting Switch에 관한 연구)

  • 강응석;신대철;최종문
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.4
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    • pp.97-103
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    • 2004
  • In general the starting current of single phase induction motor is 3 to 6times of the rated current It make flickering an electric lamp, dispersion a TV screen, insulation destructing an electric motor and momentary blazing of house wiring. Thus it happens losing an electric power loss and reducing an efficiency and a life of home electrical apparatus. In this paper, we proposed the method of reducing staring current with 3.7(%) using TRIAC and ACCT(alternated current transformer) in order to improve the above problem And also we verified semipermanent system with using semiconductor element.

Single-Switch ZVZCS Quasi-Resonant CLL Isolated DC-DC Converter for 32'' LCD TV

  • Ryu, Seung-Hee;Ahn, Jung-Hoon;Cho, Kwang-Seung;Lee, Byoung-Kuk
    • Journal of Electrical Engineering and Technology
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    • v.10 no.4
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    • pp.1646-1654
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    • 2015
  • In this paper, a single-switch ZVZCS quasi-resonant CLL isolated DC-DC converter for driving a low-power (less than 100 W) 32'' LED backlighting liquid crystal display television (LCD TV) is proposed. The proposed converter exhibits both forward and flyback operational characteristics. All semiconductors are activated and deactivated under the soft switching conditions during the switching transition without additional active devices. The switching frequency varies less than about 10 kHz for load variations, leading to minimizing the efficiency reduction under light load. Furthermore, the low di/dt and dv/dt by soft switching enhance the electromagnetic interference (EMI) performance above 1 MHz. A theoretical analysis is described in detail, and a 72-W prototype converter verifies the validity of the analysis.

The Operational Characteristics of $LiNbO_3$ Q-Switch for Generating a Single Pulse Laser (단일 레이저 펄스 발생을 위한 $LiNbO_3$ Q-스윗치 동작 특성)

  • 문종민
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.13 no.3
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    • pp.7-10
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    • 1976
  • To eliminate some difficulties encountered in the operation of $LiNbO_3$ crystal as a Q-switch for generating a single pulse Nd-YAG laser, the operational characteristics of the crystal, was investigated. Also a simple method for solving the difficulties was presented.

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A Study on the Improvement of Starting Characteristics for Single Phase Induction Motor (단상유도전동기 기동특성 개선에 관한 연구)

  • Lim, Yang-Su;Back, Hyung-Lae
    • Proceedings of the KIEE Conference
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    • 1995.11a
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    • pp.284-286
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    • 1995
  • The most common for starting a single phase induction motor is to install a starting condenser and a centrifugal switch in series with the auxiliary winding. Though this method is simple, life of single phase induction motor is short because of malfunction of a starting condenser and a centrifugal switch and efficiency improvement has limitation. In this paper, the starting characteristics of SPIM is improved by voltage and phase control strategy of auxiliary winding in removing a starting condenser and a centrifugal switch. Finally, the excellent starting performance of SPIM is shown through simulation and experimental results.

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