• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.181-184
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• 2001

This paper has been studied driving circuits in electrical valves. Also in this paper, opto-couplers of driving circuit are replaced with digital one chip of Altera company. Designs in order to realization of one chip are carried out with Altera Max Plus II. For compact size and light weight, the realization with one chip is necessary in the electrical valves. This paper has designed and presented the digital schemetic circuits, finally the driving circuits are sucessfully operated with the designed chip and showed the saving of area in the driving circuits of electric valves.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.674-677
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• 2000

Operational principles and driving characteristics of two well-known energy recovery circuits for ac plasma display panels Weber and Sakai circuits are investigated Efficiency of two circuits is analyzed by comparing the in put current of the circuits with different operating conditions. Driving characteristics of the Weber circuit are studied when the magnitude and pulse width of the driving boltage very.

• Journal of Power Electronics
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• v.14 no.2
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• pp.217-225
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• 2014

This paper deals with the optimization of the driving techniques for the ZVT synchronous buck converter proposed in [1]. Two new gate drive circuits are proposed to allow this converter to operate by only one control signal as a 12V voltage regulator module (VRM). Voltage-driven method is applied for the synchronous rectifier. In addition, the control signal drives the main and auxiliary switches by one driving circuit. Both of the circuits are supplied by the input voltage. As a result, no supply voltage is required. This approach decreases both the complexity and cost in converter hardware implementation and is suitable for practical applications. In addition, the proposed SR driving scheme can also be used for many high frequency resonant converters and some high frequency discontinuous current mode PWM circuits. The ZVT synchronous buck converter with new gate drive circuits is analyzed and the presented experimental results confirm the theoretical analysis.

• Journal of Korean Vacuum Science & Technology
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• v.3 no.1
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• pp.66-73
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• 1999

In this paper, the design of one-chip FED system integrated with driving circuits in reported on the basis of MOSFET controlled FEA (MCFEA). To integrate a MOSFET with a FEA efficiently, a new fabrication process is proposed. It is confirmed that the MOSFET with threshold voltage of about 2volts controls the FEA emission current up to 20 ${\mu}$A by applying driving voltage of 15 volts, which is enough current level to utilize the MCFEA as a pixel for FED. The drain breakdown voltage of the MOSFET is measured to be 70 volts, which is also high enough for 60 volt operation of FED. The circuits for row and column driver are designed stressing on saving area, reducing malfunction probability and consuming low power to maximize the merit of on-chip driving circuits. Dynamic logic concept and bootstrap capacitors are used to meet these requirements. By integrating the driving circuit with FEA, the number of external I/O lines can be less than 20, irrespectively of the number of pixels.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.7
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• pp.1261-1267
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• 2007

Although LEDs have been used in various applications with improving the brightness and luminous efficacy, the electrical and optical characteristics of high power LED varies at different temperature and starting time. In this paper, optimal heat sink and apparatus design were conducted using IR camera and ICEPAK on the LED bulb consisting with fourteen LED array. The temperatures of heat sink and LED device of the designed LED bulb without cooling pan were $74^{\circ}C\;and\;96.8^{\circ}C$, respectively, showing in good themal characteristics. For high efficiency driving circuit of LED array adopted optimal heat sink design, driving circuits of constant voltage and current circuits were suggested and fabricated. As a result the efficacy of all driving circuits showed more than 20 lm/W. Also, the constant current circuits are suitable for signal lamp, hallway lamp, and flash lamp having short operating time(about 30 min). On the other hand, a reading light and indoor lamp having long operating time can be controlled by constant voltage circuit.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.33 no.2
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• pp.151-154
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• 2020

Radiation noise due to EMI noise generated by the driving circuits of LED lighting devices in a medical imaging room was reduced by decreasing the noise source in the driving circuits and changing the number of corrections in EMI filters. Noise attenuation and filter changes enabled driving circuits that reduced the electromagnetic waves. Such circuits were efficiently designed by using capacitors and inverters in a given space. Therefore, the malfunction of radiation devices can be minimized by using EMI-reduction filter circuits, and reliable operation of medical devices can be expected by blocking electromagnetic waves.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.27 no.9
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• pp.15-22
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• 2013

A new LED lamp driving technology with a charge pump instead of a conventional DC-DC converter is proposed. The proposed driving technology is used to control the LED lamp with digital dimming. The power loss in the zener diodes is reduced because the charging process of the capacitors is selectively controlled according to the digital control signal. From the experimental results, when dimming four LED lamps simultaneously, the average driving circuit efficiency of 89% is obtained, regardless of the dimming level. White light with color temperature over a range of 2800~7200K was produced by dimming control of red, green, blue and amber LED lamps with the proposed driving circuit. The characteristics of the driving circuits can be changed depending on the characteristics of the R, G, B, and A LED lamps. The efficiency of the driving circuits up to a maximum 89% can also be obtained depending on the combination of LED lamps. The driving technology with digital dimming control for LED lamps proposed in this paper would be effective for obtaining high efficiency in LED driving circuits and remote control of LED lamps using digital communications.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.48 no.5
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• pp.339-343
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• 1999

This paper reports the characteristics of poly-Si TFT unitary CMOS circuits fabricated with various techniques, in order to investigate the optimum process conditions. The active films were deposited by PECVD and LPCVD using $SiH_4\; and\; Si_2H_6$ as source gas, and annealed by SPC and ELA methods. The impurity doping of the oource and drain electrodes was performed by ion implantation and ion shower. In order to investigate the AC characteristics of the poly-Si TFTs processed with various methods, we have examined the current driving characteristics of the polt-Si TFT and the frequency characteristics of 23-stage CMOS ring oscillators. Ithas been observed that the circuits fabricated using $Si_2H_6$ with low-temperature process of ELA exhibit high switching speed and current driving performances, thus suitable for real application of large area electronics.

• Proceedings of the KIEE Conference
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• 2002.11c
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• pp.554-557
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• 2002

In this paper, PDP driving circuit is designed to show the pattern of still-image with ADS (Address Display Separation) driving method. The designed circuits consist of three stages which are the image processing program, digital logic parts, and power circuits. The Image processing program is designed serial-communication with RS-232C using BASIC language. Digital logic parts design ADS driving signals with Xilinx FPGA and are simulated by ModelSim 5.5f. Power circuits convert output of digital logic parts into high voltage which panel is drived.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.797-800
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• 2005

In this paper, the designed 10-bit current steering data driving circuit consists of bias circuits, shift registers, data and line latches, level shifters, and 10-bit D/A converters. This data driving circuit can improve image quality, driving speed, and can reduce process error, DNL error, and glitch noise. To reduce current cells, the 10-bit D/A converter was designed 3+3+4 hybrid type. As a result 49 current cells are decreased. The transient analysis shows that currents flows a few of mA in data line and the currents have 1024 gray levels of current values. Total circuits are designed for 10 ${\mu}s$ speed. Thus the designed 10-bit current steering data driving circuit can be usable in HDTV/XGA AMOLED displays. These data driving circuits are designed for 0.35 ${\mu}m$ CMOS process at 3.3 V and 18 V supply voltage and simulated with HSPICE..