• Title, Summary, Keyword: SMPS

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A Study on Development of High Efficiency SMPS used in LED (LED용 고효율 SMPS 개발에 관한 연구)

  • Kwak, Dong-Kurl;Lee, Bong-Seob;choi, Shin-Hyeong;Park, Young-Jic
    • Proceedings of the KIPE Conference
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    • pp.431-432
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    • 2014
  • Recently, the demand of LED(light-emitting diode) lighting is gradually enlarged by governmental saveenergy policy, which the LED lighting has been established compulsorily in new buildings, public institutions, and residential installations etc.. The LED lighting is driven by SMPS (switching mode power supply). The SMPS requires high efficiency because the SMPS changes a commercial ac power source to low voltage dc power source. Harmonic components that occur in the conversion process of SMPS decrease system power factor and deal great damage in electric power system. To improve such problems, this paper proposes a SMPS of high efficiency. The switching devices in the proposed SMPS are operated by soft switching technique using a new quasi-resonant circuit. The input ac current waveform in the proposed SMPS becomes a quasi-sinusoidal waveform proportional to the magnitude of input ac voltage under constant switching frequency. As a result, the proposed SMPS obtains low switching power loss and high efficiency, and its input power factor is nearly in unity.

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Development and Evaluation of Hy-SMPS (Hy-SMPS의 개발 및 성능평가)

  • Lee, Hong-Ku;Eun, Hee-Ram;Lee, Gun-Ho;Ahn, Kang-Ho
    • Particle and aerosol research
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    • v.11 no.2
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    • pp.57-61
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    • 2015
  • Atmospheric nano-particles along the altitude is one of the main factors causing severe weather phenomena. It is a challenge to find the precise particle size distribution. One useful instrument includes a scanning mobility particle sizer (SMPS). This measures the size distribution of submicron aerosols. The SMPS consists of a condensation particle counter (CPC), differential mobility analyzer (DMA), high voltage power supplier (HVPS), and neutralizer. Due to the many components, it is difficult to install a commercial SMPS into a tethered balloon package system (Eun, 2011). In this study, we customized a SMPS for the tethered balloon package system called Hy-SMPS. It is portable, compact in structure, and evaluated by TSI SMPS using mono and poly-dispersed particles.

Digital Control of DC-DC Converter Using Low Cost Processor (저가형 프로세서를 이용한 DC-DC 컨버터의 디지털 제어)

  • Kim, Du-Il;Park, Hyo-Sik;Kim, Hee-Jun
    • Proceedings of the KIEE Conference
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    • pp.1540-1542
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    • 2005
  • In SMPS, digital control techniques are adopted widely. But Digital controlled SMPS has poor performance of regulation and transient response than analog controlled SMPS. Delay time of control computing and low frequency of updating duty ratio make digital controlled SMPS poor performance. This paper proposed the optimized control computation to increase not only frequency of updating duty ratio but also switching frequency of SMPS.

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Development of a 150W Switched Mode Power Supply operates at -40℃ (-40℃에서 동작하는 150W급 SMPS 개발)

  • Park, Sung-Il;Kim, Sung-Soo
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.1
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    • pp.85-92
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    • 2018
  • In this paper, we designed a 150W LED lighting SMPS circuit operating at $-40^{\circ}C$. We designed a 150W LED lighting constant current circuit for the characteristics of the SMPS and fabricated and measured. The operating temperature range for a 150W LED lighting SMPS circuit is -40 to $70^{\circ}C$ and SMPS predicted life was 1.29-2.25 years based on 24 hours. The high acceleration life test and EMI test confirmed no abnormality.

Development of the SMPS Power Module for the Medical Kit (SMPS방식을 적용한 의료기기용 전원모듈 개발)

  • Lee, Sangsik;Lee, Kiyoung
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.2 no.1
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    • pp.11-15
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    • 2009
  • In this study, we have developed the SMPS(Switched-mode power supply) power module for the medical kit. It is used the medical kit for improved supplying power better than the existing power module in performance, safety and reliability. The developed SMPS(Switched-mode power supply) is composed of the three fundamental electronic circuits, first one is for converting AC power to DC power, second one is for converting to high frequency, and the other is for absorbing noise frequency and preventing malfunction. It is possible for developed SMPS module to enlarge applications for PC, home appliances, switchboard as well as medical instruments.

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Analysis of SMPS Characteristics applying Ground Plane Layer (Ground Plane레이어를 적용한 SMPS 특성분석)

  • Park, Jin-Hong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.1
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    • pp.436-440
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    • 2014
  • To verity the effect of PCB plane layer to the output characteristics of the Switched Mode Power Supply (SMPS), this paper compared with a generic one-layer PCB and a double-side PCB. This paper specially focused on the voltage, the current and the high frequency noise of the output characteristic of the SMPS, using a double-side PCB which has same layout and was installed a ground plane on the opposite side. This double-side PCB was assembled by all same components which used on the SMPS using the single-side PCB. The experiment results show the SMPS using the ground plan PCB can efficiently reduce the high frequency noise to 50mV at 100MHz from 150mV in the single-side PCB. And the results also show the high harmonics frequency was reduced as well.

SMPS for Control Circuit of Electric Fork-lift Truck (전동지게차의 제어회로용 SMPS)

  • Kim, Chong-Chul;Shin, Jung-Mug;Lee, Byeong-Seok
    • Proceedings of the KIEE Conference
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    • pp.913-914
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    • 2006
  • In industrial field, electric fork-lift has been mainly powered by batteries which are varied from DC 36V to 80V. Operating electric fork-lift truck depends on stable electric power supplies which are ensured by using Switched Mode Power Supply (SMPS). This paper presents design of SMPS for stable electric power supply. The SMPS has much strength such as high effectiveness, low cost and high stability of output voltage. At the same time, SMPS is small and multi output and has simple design of circuit.

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Development of the Telemetering Control System for the HDTV SMPS Aging System (HDTV SMPS Aging System을 위한 원격 계측 제어 시스템 개발)

  • Kim, Byoung-Wook;Lim, Seung-Kwan;Ko, Dae-Sung;Roh, Shin-Rea;Kim, Yeong-Min
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.1
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    • pp.56-61
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    • 2009
  • In this paper, A telemetering control system for the HDTV SMPS Aging System is developed. Manual Aging System is usually used to measurement of a produced SMPS. But in this system, the respective operator is arranged and monitoring the test cycle visually- According to an excess of the test time and mistakes of an operator, the reliability makes come to be low. Therefore as using the telemetering control system, it improves a productivity and a reliability of the HDTV SMPS. In the developed system, elec1rical signal is measured from aging system, and converted into the digital signal. Also the telemetering control system is composed of many units - telemetering control units for collecting the data, data relay units for the digital transmission service, data division for the multichannel realization.

The Effect of Water Droplets on the Nano Particle Size Distribution using the SMPS System (SMPS 시스템에서 용매(물)가 나노입도측정결과에 미치는 영향)

  • Hwangbo, Seon-Ae;Chu, Min-Cheol
    • Journal of Korean Powder Metallurgy Institute
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    • v.20 no.2
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    • pp.129-133
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    • 2013
  • In this paper we have studied the effect of water droplet size on nano-particle size distribution using SMPS(Scanning Mobility Particle Sizer)system. It can be seen that the unknown peak at >100 nm was caused by water droplets which did not dry completely when DI water was used as a solvent in the SMPS system. Therefore, it is important to dry water droplets generated from atomizer in the SMPS system when measuring the particle size distribution using less than 100 nm nano-particles in diameter. From this study, It can be concluded that the napion was a useful material as dryer ones and using EAG(Electro Aerosol Generator) as a particle generator was the most effective in reducing the effect of water droplets.

Effective density measurement of ambient sub-micron aerosol using SMPS and 1 stage low-pressure impactor (SMPS와 1단 저압 임팩터를 이용한 대기 중 서브 마이크론 에어로졸 유효 밀도 측정)

  • Oh, Jaeho;Han, Jangseop;Park, Geunyoung;Hwang, Jungho
    • Particle and aerosol research
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    • v.15 no.3
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    • pp.115-126
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    • 2019
  • In this study, a serial methodology is presented for estimating the effective density of ambient sub-micron aerosol employing lab-made 1 stage low-pressure impactor of Hyun et al. (2015) and SMPS (Scanning Mobility Particle Sizer) together. The effective density from this methodology (Impactor+SMPS) was compared with another methodology (BAM+SMPS) for estimating the effective density employing BAM (Beta-Attenuation Monitor) and SMPS. As a result, the effective density obtained with impactor+SMPS ranged from $0.42g/cm^3$ to $2.36g/cm^3$, while the effective density obtained with BAM+SMPS ranged from $1.01g/cm^3$ to $1.72g/cm^3$. The difference between these results might be caused by the particle loss in the impactor.