Search Results - "Cho, G.H."

Three-level space vector PWM in low index modulation region avoiding narrow pulse problem by Liu, H.L., Cho, G.H.

“…In using GTO, a few hundreds micro seconds longer than specified pulse width must be guaranteed for safety for each device to commutate with its inherent gate…”
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075 PTCH1 mutations in high-frequency basal cell carcinoma patients without Gorlin stigmata by Hua, V.J., Chan, W.H., Cho, G.H., Do, H., Bailey, I., Oro, A., Tang, J., Sarin, K.Y.

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Analysis and controller design of static VAr compensator using three-level GTO inverter by Cho, G.C., Jung, G.H., Choi, N.S., Cho, G.H.

“…A static VAr compensator (SVC) using a three-level GTO voltage source inverter (VSI) is presented for high-voltage, high-power applications. The three-level…”
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A Low-Cost High-Efficiency CCFL Inverter With New Capacitive Sensing and Control by Kim, S.K., Han, H.S., Woo, Y.J., Cho, G.H.

“…A new low-cost and efficient cold cathode fluorescent lamp (CCFL) inverter for liquid crystal display (LCD) application is suggested in this paper. The…”
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Phasor transformation and its application to the DC/AC analyses of frequency phase-controlled series resonant converters (SRC) by Rim, C.T., Cho, G.H.

“…A novel modeling technique based on phasor transformation that provides a unified model of series resonant converters (SRCs) is proposed. The approach gives…”
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A complete DC and AC analysis of three-phase controlled-current PWM rectifier using circuit D-Q transformation by Rim, C.T., Choi, N.S., Cho, G.C., Cho, G.H.

“…A recently proposed circuit P-Q transformation is used to analyze a three-phase controlled-current PWM rectifier. The DC operating point and AC transfer…”
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A unity power factor high frequency parallel resonant electronic ballast by Lee, C.H., Joung, G.B., Cho, G.H.

“…An electronic-ballast circuit that operates at a 20 kHz resonant frequency with zero voltage switching is described for a metal halide lamp. In order to…”
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Transformers as equivalent circuits for switches: general proofs and D-Q transformation-based analyses by Rim, C.T., Hu, D.Y., Cho, G.H.

“…The equivalent circuits for the switches in DC-DC, DC-AC, AC-DC, and AC-AC converters are proved to be time-varying transformers. This result is used in the…”
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Optimal PWM design for high power three-level inverter through comparative studies by Liu, H.L., Cho, G.H., Park, S.S.

“…Comparative studies between harmonic elimination and optimal PWM strategies are given for high power three-level inverter feeding an induction motor. An…”
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Soft switching space vector PWM inverter using a new quasi-parallel resonant DC link by Jung, Y.c., Liu, H.L., Cho, G.C., Cho, G.H.

“…A soft switching quasi-parallel resonant DC-link (QPRDCL) inverter with improved PWM capability has been recently presented. The circuit has the minimum…”
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A 2 GHz LC-oscillator with automatic swing control for IMT-2000 application by Ryoo, J.Y., Cho, G.H.

“…Describes the design of 2 GHz LC-oscillator for IMT-2000 frequency band application. The LC-oscillator has a simple automatic swing control circuit for…”
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Practical switch based state-space modeling of DC-DC converters with all parasitics by Rim, C.T., Joung, G.B., Cho, G.H.

“…All parasitics such as switch conduction voltages, conduction resistances, switching times, and ESRs of capacitors are counted in a proposed DC-DC power…”
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Optimum quantum sequence control of quantum series resonant converter for minimum output voltage ripple by Kwon, W.H., Cho, G.H.

“…A new control scheme named optimum quantum sequence control (OQSC) which always minimizes the output voltage ripple of the quantum series resonant converter…”
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Integral cycle mode control of the series resonant converter by Joung, G.B., Rim, C.T., Cho, G.H.

“…A control method for the series resonant converter (SRC) in which the device switching instants are always synchronized to the zero-crossing points of the…”
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Single-cycle resonant converters: a new group of quasi-resonant converters suitable for high-performance DC/DC and AC/AC conversion applications by Cho, J.G., Cho, G.H.

“…A novel resonant switch and a family of zero-current and zero-voltage mixed-mode switching quasi-resonant converters (QRCs) called single-cycle resonant…”
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Phase-error-free quadrature sampling technique in the ultrasonic B-scan imaging system and its application to the synthetic focusing system by Chang, S.H., Park, S.B., Cho, G.H.

“…The quadrature sampling technique as a means of detecting the envelope of RF waveform in the baseband is well known. If this technique is applied to a focused…”
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A generalized quantum resonant converter using a new quantum resonant module by Joung, G.B., Cho, J.G., Cho, G.H.

“…For the generalization of quantum resonant converters, new quantum resonant modules, which are a quantum series resonant module (QSRM) and a quantum parallel…”
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Novel snubberless three-level GTO inverter with dual quasi-resonant DC-link by Yi, W., Cho, G.H.

“…A three-level GTO inverter topology is presented. This new power circuit includes many advantages compared with the conventional three-level GTO inverter. The…”
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Novel off-line zero-voltage-switching PWM AC/DC converter for direct conversion from AC line to 48 VDC bus with power factor correction by Cho, J.G., Cho, G.H.

“…An offline zero-voltage-switching (ZVS) PWM AC-DC power converter for single-stage preregulation in distributed power systems is proposed. The converter…”
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Three-level space vector PWM in low index modulation region avoiding narrow pulse problem by Liu, H.L., Cho, G.H.

“…A detailed mechanism of generation of narrow gating pulses in conventional nearest three-level vector (NTV) space vector PWM invertors is described and new…”
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