• Journal of Advanced Navigation Technology
• /
• v.22 no.2
• /
• pp.154-162
• /
• 2018

The multiplier circuit is necessary to estimate degradation status of electronic cards in nuclear power plant, but its accuracy is not easy in processing those functions to multiply two input signals. What is important in multiplier circuit is that the multiplication result must be accurate and its linearity must be perfect. We developed and proposed excellent linearity multiplier circuit using operational amplifiers and transistor characteristics, and then proved its validity in this paper. We have made efforts to eliminate nonlinearity components of semiconductors with this circuit in order to ensure excellent linearity of developed multiplier circuit. We conducted multiplication operations through simulation, applying adequate values to each component in order to verify the circuit composed of that method. We showed step-by-step output signals, and then compared the logical analyses and measuring results as simulation results. We confirmed that this method is superior to existing multiplication or linearity.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2010.04a
• /
• pp.276-279
• /
• 2010

This paper is about a development of effective practice subject in electronic circuit textbook of industrial high school. This paper introduces generally about the practice subject in electronic circuit textbook of industrial high school of the 7th National curriculum and presents problem of current practice and makes an alternative idea that improve current practice. The contents of current electronic circuit textbook of industrial high school have variety topics and these topics are independence and separated. So students have some problems to apply of learned knowledge. Therefore, researcher improved the various electronic circuit practice in current electronic circuit text book and added new practice and manufactured a electronic circuit module based on these circuits. And researcher suggested new practice subject what useful electronic equipment that assembled module of result of electronic circuit practice of each section. When the last subjects are accomplished the students may have feel of achievement and high study effect from these practice. The practice subjects of this paper were manufactured after verification and tested it's performance by computer simulation program I hope that these new practice subjects make effective understanding and application of electronic circuit for student.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.26 no.8
• /
• pp.1-7
• /
• 2012

In this paper, a new LED driving circuit which is able to control dimming of LED is proposed using charge pump. The proposed LED driving circuit steps down the input voltage to operate LED without DC-DC converter. The operation of this driving circuit is verified by P-Spice simulation, and the characteristics of the driving circuit is measured and evaluated in the experiments. As a result, the driving circuit efficiency of 88.5[%] is obtained when all LEDs are turned on by digital control method at the highest dimming level(255/255).

• Journal of information and communication convergence engineering
• /
• v.7 no.1
• /
• pp.62-65
• /
• 2009

In this paper, the temperature characteristics of full CMOS FLL(frequency locked loop) re analyzed. The FLL circuit is used to generate an output signal that tracks an input efference signal. The locking time of FLL is short compared to PLL(phase locked loop) circuit because the output signal of FLL is synchronized only in frequency. Also the FLL s designed to allow the circuit to be fully integrated. The FLL circuit is composed two VCs, two buffers, a VCO and two frequency dividers. The temperature variation of frequency divider, FVC and buffer cancelled because the circuit structure. is the same and he temperature effect is cancelled by the comparator. Simulation results are shown to illustrate the performance of the designed FLL circuit with temperature.

• Proceedings of the IEEK Conference
• /
• 1999.11a
• /
• pp.947-950
• /
• 1999

The PLD design of new scheme LCD driver circuit is described in this paper. A new scheme LCD driver circuit doesn't used microprocessor for the convenience of users. A new scheme LCD driver circuit consists of 4 main parts, that is, a serial/parallel communication control block part, a LCD controller part, a LCD driver part and a RAM/ROM control block part. The validity and efficiency of the proposed LCD driver circuit have been verified by simulation and by ALTERA EPM7192SQC160-15 PLD implementation in VHDL. After comparing this LCD driver circuit to specify it was verified that the developed LCD driver circuit showed has good performances, such as low cost, convenience of users.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.5 no.4
• /
• pp.327-334
• /
• 2000

In this paper, the circuit model using circuit averaging method for full bridge for full bridge converter is suggested. This model can represent the physical characteristics of converter circuits appropriately. At most of high capacity DC-DC converter application parts, full bridge converter is adapted for main circuit of power supply. Design and analysis of full bridge converter is no trouble with circuit model. The validity of circuit model is verified through computer simulation and practical welding experiment of welding machine with full bridge converted model.

• Proceedings of the KIPE Conference
• /
• 2006.06a
• /
• pp.254-256
• /
• 2006

A Novel way to support typical Thermal Shut Down(TSD) circuit is proposed. In power ICs, on-time or on-duration is the key factor to anticipate an abrupt increase of internal temperature. Such an abrupt raise of the temperature can cause TSD circuit cannot protect on proper time due to the temperature detection delay come from the physical distance or the imperfect coupling between heat sources and detector. The proposed circuit checks the duty ratio touched their maximum or not in every cycle. Once duty ratio touches the maximum duty, new circuit generates the warning signal to the TSD circuit and lowers pre-determined temperature for shut down to compensate the detection delay. The novel circuit will be analyzed to the transistor level and checked the validity by simulation.

• Journal of electromagnetic engineering and science
• /
• v.14 no.4
• /
• pp.415-418
• /
• 2014

This paper presents an equivalent circuit model for a dumbbell-shaped defected ground structure (DGS) in a microstrip line. The effects of equivalent circuit elements of a dumbbell-shaped DGS and their magnetic coupling to the host transmission line are modeled as a simple lumped-element circuit. In addition, simple approximate expressions to determine the main circuit parameters for this model are presented. The transfer characteristic calculated by the proposed circuit model is compared with the results of EM simulation and measurement.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
• /
• 2003.10a
• /
• pp.76-78
• /
• 2003

We have designed and tested an RSFQ (Rapid Single Flux Quantum) NDRO (Non Destructive Read Out) circuit for the development of a high speed superconducting ALU (Arithmetic Logic Unit). When designing the NDRO circuit, we used Julia, XIC and Lmeter for the circuit simulations and layouts. We obtained the simulation margins of larger than $\pm$25％. For the tests of NDRO operations, we attached the three DC/SFQ circuits and two SFQ/DC circuits to the NDRO circuit. In tests, we used an input frequency of 1 KHz to generate SFQ Pulses from DC/SFQ circuit. We measured the operation bias margin of NDRO to be $\pm$15％. The circuit was measured at the liquid helium temperature.

• Journal of Industrial Technology
• /
• v.31 no.A
• /
• pp.103-107
• /
• 2011

In this paper, a method is proposed to improve power factor and the input current THD in LED driver circuit. The researched circuit consists of a valley-fill circuit and boosting inductor and a Buck converter. Valley-fill circuit is a passive PFC and simplified structure, the buck converter is operated with current feedback. The switching frequency is 50KHz in LED driver circuit and LED forward current is constant. A valley-fill type PFC circuit for LED driver(15Watt) has been implemented, and the validity of proposed method is shown by is simulation and experimental result.