A Novel Burst Mode Control Algorithm for SE-IH Applications to Reduce Switch Current Spikes With Improved System Reliability and Power Conversion Efficiency
Aneel Ahmed, Sang‐Wook Ryu, Hyunghu Park, Irfan Ali, Zawar H. Khan, Jin‐Woo Jung
IF 9.9
IEEE Transactions on Industrial Informatics
This article presents an efficient burst mode control algorithm (BMCA) designed to reduce the turn-<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> switch current spike in the power control of a single-ended induction heater (SE-IH). Modern SE-IH uses two control modes: square wave control at heavy loads and burst mode control at light loads to effectively control power flow to the induction heating load. First, the former achieves soft switching, i.e., zero voltage switching, at higher load conditions by properly controlling the switching frequency or duty ratio. Second, the latter often encounters inefficiencies and potential hazards due to current spikes at the switch turn-<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> instant, caused by the sudden discharge of the dc-link capacitor through the resonant capacitor at lower load conditions. These current spikes result in significant power loss and thermal stress, which can ultimately cause the power switch to burn out. This article proposes a novel BMCA that optimizes burst mode operation to significantly reduce current spikes and enhance system reliability and overall power efficiency. The proposed algorithm, thoroughly tested, demonstrates superior performance compared to conventional commercial SE-IHs. Experimental results from a 2.6 kW SE-IH prototype using a TMS320F28377D control board validate the proposed solution’s efficacy under various load conditions.
A low-temperature driving scheme of EEFLS inverter for LCD TV backlights
Tae‐Seung Cho, Jin‐Woo Jung, Dong-Myung Lee, Eun Ha Choi, Guangsup Cho
IF 10.9
IEEE Transactions on Consumer Electronics
A new low-temperature driving method of EEFLs (external electrode fluorescent lamps) inverter for LCD TV backlights is proposed. The proposed driving scheme achieves a zero current switching (ZCS) of lower switches and dramatically reduces the temperature of the transformer at which the power loss mainly occurs. Moreover, the capacitance of EEFLs is calculated by the QV Lissajous analysis method and then the optimal switching interval for a low heating loss of the transformer is determined. To investigate the feasibility of the proposed driving method, various experimental results using a prototype 17-inch LCD TV backlight with 12 EEFLs are presented.
A new simple-structure driving circuit to eliminate path switches for plasma display panels
Jin‐Woo Jung, Dong-Myung Lee, Sangshin Kwak, Tae-Seung Cho
IF 10.9
IEEE Transactions on Consumer Electronics
A new simple-structure PDP driving circuit without using any path separation switch is proposed and its operational principle is addressed in detail. The proposed driver employs not a path switch but a path diode to prevent the shoot-through current which flows from Y-main ground to negative scan low voltage source during the ramp-down reset and address periods. Consequently, it has advantages such as simpler structure, higher efficiency, and lower cost due to no path switches. To verify the effectiveness of the proposed driver, experimental results using a prototype 42-inch HD PDP module are presented.
A new sustain driver with energy recovery circuit based on low-voltage components and low-voltage power supply for AC plasma display panel
Sangshin Kwak, Jin‐Woo Jung, Dong-Myung Lee, Tae-Seung Cho
IF 10.9
IEEE Transactions on Consumer Electronics
A novel sustain driver with energy recovery circuit is proposed based on low-cost and low-rating devices for plasma display panels. Since the proposed driver is designed by devices with half of voltage rating compared with the conventional Weber-type driver, it can take advantages of semiconductor devices with reduced conduction and switching losses as well as cheaper costs. Moreover, the proposed driver is supplied from half of required sustain voltage level in comparison with the conventional driver. The developed structure is configured with fewer devices than the prior approach with a cascaded Weber-type driver, which employs reduced voltage-rating components. As a result, the PDP driver presented in this paper can feature smaller size, lower cost, and high efficiency for both the sustain driver and the power supply circuit.
Using Threshold Estimation Technique to Measure Housing Wealth Effect in Different Income Levels
Jin‐Woo Jung, Changha Jin
RePEc: Research Papers in Economics
In this study, we estimate the housing wealth effect of households with different income levels. Since we expect the housing wealth effect to vary based on the different income levels, we use the threshold estimation technique developed in Hansen (1999) instead of imposing an exogenous criterion to divide the sample by income level. This econometric technique is developed for panels with individual-specific fixed effects. Therefore, we apply this econometric method on the findings in the existing literature to estimate the housing wealth effect, while considering the heterogeneity in different income categories. We obtain individual level data from the 2012 to 2016 Korea Household Finance and Welfare Survey (KHFWS) and find statistically significant threshold income levels, thus indicating households show different behaviors based on the threshold income. We provide the groundwork for future research to identify the target group who maximizes their wealth effect, which has housing policy implications.
Feasibility of an AI-Enabled Smart Mirror Integrating MA-rPPG, Facial Affect, and Conversational Guidance in Realtime
Mohammad Afif Kasno, Jin‐Woo Jung
IF 3.5
Sensors
This paper presents a real-time smart mirror system combining multiple AI modules for multimodal health monitoring. The proposed platform integrates three core components: facial expression analysis, remote photoplethysmography (rPPG), and conversational AI. A key innovation lies in transforming the Moving Average rPPG (MA-rPPG) model-originally developed for offline batch processing-into a real-time, continuously streaming setup, enabling seamless heart rate and peripheral oxygen saturation (SpO<sub>2</sub>) monitoring using standard webcams. The system also incorporates the DeepFace facial analysis library for live emotion, age detection, and a Generative Pre-trained Transformer 4o (GPT-4o)-based mental health chatbot with bilingual (English/Korean) support and voice synthesis. Embedded into a touchscreen mirror with Graphical User Interface (GUI), this solution delivers ambient, low-interruption interaction and real-time user feedback. By unifying these AI modules within an interactive smart mirror, our findings demonstrate the feasibility of integrating multimodal sensing (rPPG, affect detection) and conversational AI into a real-time smart mirror platform. This system is presented as a feasibility-stage prototype to promote real-time health awareness and empathetic feedback. The physiological validation was limited to a single subject, and the user evaluation constituted only a small formative assessment; therefore, results should be interpreted strictly as preliminary feasibility evidence. The system is not intended to provide clinical diagnosis or generalizable accuracy at this stage.
A Novel Burst Mode Control Algorithm for SE-IH Applications to Reduce Switch Current Spikes With Improved System Reliability and Power Conversion Efficiency
Aneel Ahmed, Sang‐Wook Ryu, Hyunghu Park, Irfan Ali, Zawar H. Khan, Jin‐Woo Jung
IF 9.9
IEEE Transactions on Industrial Informatics
This article presents an efficient burst mode control algorithm (BMCA) designed to reduce the turn-<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> switch current spike in the power control of a single-ended induction heater (SE-IH). Modern SE-IH uses two control modes: square wave control at heavy loads and burst mode control at light loads to effectively control power flow to the induction heating load. First, the former achieves soft switching, i.e., zero voltage switching, at higher load conditions by properly controlling the switching frequency or duty ratio. Second, the latter often encounters inefficiencies and potential hazards due to current spikes at the switch turn-<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> instant, caused by the sudden discharge of the dc-link capacitor through the resonant capacitor at lower load conditions. These current spikes result in significant power loss and thermal stress, which can ultimately cause the power switch to burn out. This article proposes a novel BMCA that optimizes burst mode operation to significantly reduce current spikes and enhance system reliability and overall power efficiency. The proposed algorithm, thoroughly tested, demonstrates superior performance compared to conventional commercial SE-IHs. Experimental results from a 2.6 kW SE-IH prototype using a TMS320F28377D control board validate the proposed solution’s efficacy under various load conditions.
A low-temperature driving scheme of EEFLS inverter for LCD TV backlights
Tae‐Seung Cho, Jin‐Woo Jung, Dong-Myung Lee, Eun Ha Choi, Guangsup Cho
IF 10.9
IEEE Transactions on Consumer Electronics
A new low-temperature driving method of EEFLs (external electrode fluorescent lamps) inverter for LCD TV backlights is proposed. The proposed driving scheme achieves a zero current switching (ZCS) of lower switches and dramatically reduces the temperature of the transformer at which the power loss mainly occurs. Moreover, the capacitance of EEFLs is calculated by the QV Lissajous analysis method and then the optimal switching interval for a low heating loss of the transformer is determined. To investigate the feasibility of the proposed driving method, various experimental results using a prototype 17-inch LCD TV backlight with 12 EEFLs are presented.
A new simple-structure driving circuit to eliminate path switches for plasma display panels
Jin‐Woo Jung, Dong-Myung Lee, Sangshin Kwak, Tae-Seung Cho
IF 10.9
IEEE Transactions on Consumer Electronics
A new simple-structure PDP driving circuit without using any path separation switch is proposed and its operational principle is addressed in detail. The proposed driver employs not a path switch but a path diode to prevent the shoot-through current which flows from Y-main ground to negative scan low voltage source during the ramp-down reset and address periods. Consequently, it has advantages such as simpler structure, higher efficiency, and lower cost due to no path switches. To verify the effectiveness of the proposed driver, experimental results using a prototype 42-inch HD PDP module are presented.
A new sustain driver with energy recovery circuit based on low-voltage components and low-voltage power supply for AC plasma display panel
Sangshin Kwak, Jin‐Woo Jung, Dong-Myung Lee, Tae-Seung Cho
IF 10.9
IEEE Transactions on Consumer Electronics
A novel sustain driver with energy recovery circuit is proposed based on low-cost and low-rating devices for plasma display panels. Since the proposed driver is designed by devices with half of voltage rating compared with the conventional Weber-type driver, it can take advantages of semiconductor devices with reduced conduction and switching losses as well as cheaper costs. Moreover, the proposed driver is supplied from half of required sustain voltage level in comparison with the conventional driver. The developed structure is configured with fewer devices than the prior approach with a cascaded Weber-type driver, which employs reduced voltage-rating components. As a result, the PDP driver presented in this paper can feature smaller size, lower cost, and high efficiency for both the sustain driver and the power supply circuit.
