A High Efficiency Dual-Mode Buck Converter IC For Portable Applications

Liou,; Chen, Guihai; Kuo, Sy‐Yen; Huang, Biao; Yeh,

doi:10.1109/icccas.2007.4348218

Cited by 27 publications

(32 citation statements)

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“…The currentsensing signal that is converted for mode switching is formed through the reference voltage at the comparator, and the generated signal is converted into the linear mode after a certain pulse is applied by the bit counter block. This method prevents a malfunction that can occur due to noise or time delay and it restores the initial condition through the clear terminal if the current is not low [11][12][13][14][15]. As a result, generated LDO_EN signal operate linear mode and stop PWM mode simultaneously.…”

Section: Mode Selectormentioning

confidence: 99%

Wide-Input Range Dual Mode PWM / Linear Buck Converter with High robustness ESD Protection Circuit

Song¹,

Koo²

2015

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper proposes a high-efficiency, dualmode PWM / linear buck converter with a wide-input range. The proposed converter was designed with a mode selector that can change the operation between PWM / linear mode by sensing a load current. The proposed converter operates in a linear mode during a light load and in PWM mode during a heavy load condition in order to ensure high efficiency. In addition, the mode selector uses a bit counter and a transmission gate designed to protect from a malfunction due to noise or a time-delay. Also, in conditions between -40 °C and 140 °C, the converter has variations in temperature of 0.5mV/°C in the PWM mode and of 0.24 mV/°C in the linear mode. Also, to prevent malfunction and breakdown of the IC due to static electricity, the reliability of IC was improved by embedding a self-produced 8 kVclass(Chip level) ESD protection circuit of a Psubstrate Triggered SCR type with high robustness characteristics.

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Section: Mode Selectormentioning

confidence: 99%

Wide-Input Range Dual Mode PWM / Linear Buck Converter with High robustness ESD Protection Circuit

Song¹,

Koo²

2015

JSTS:Journal of Semiconductor Technology and Science

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“…Nowadays, dc-dc converters play an important role in industry, the air-space industry, portable systems, distributed generation, electrical devices, electrical machines, power factor correction and voltage regulation [1], [2], [10]- [12]. Thus, high-quality power supplying converters that can accomplish low-cost and high-efficiency performance are in demand [3].…”

Section: Introductionmentioning

confidence: 99%

Fast Transient Buck Converter Using a Hysteresis PWM Controller

Yong-xiao¹,

Zhao²,

Qu³

2013

Journal of Power Electronics

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In this paper, a fast transient buck converter using hysteresis PWM control is presented. The proposed control method is based on hysteresis control of the capacitor C voltage. This offers a faster transient response to meet the challenges of the power supply requirements for fast dynamic input and load changes. It also provides better stability and solves the compensation problem of the error amplifier in conversional voltage PWM control. Finally, the steady-state and dynamic operation of the proposed control method are analyzed and verified by simulation and experimental results.

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“…Both analog and digital methods are currently used to build up the soft-start techniques. Analog soft starts can be implemented in various ways, either using discrete components [5,6] or integrated circuits (IC) [7,8]. The choice depends on the power rating of the power supply, which varies according to the application.…”

Section: Introductionmentioning

confidence: 99%

Digital Soft Start Implementation for Minimizing Start Up Transients in High Power DAB-IBDC Converter

et al. 2018

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Abstract:The dual active bridge isolated bidirectional DC-DC converter (DAB-IBDC) is one of the prime converters used in dual active bridge renewable energy storage system (RESS) applications, particularly where a high-power density is required. The digital DSP (Digital Signal Processer) control technique also provides intelligence to applications and achieves a super compact elegant system by reducing the complicated control hardware. All power converters, including the DAB-IBDC converter, often draw an inrush current, which is many times higher than their steady state current. The inrush current is the maximum current drawn by a converter for a very few milliseconds while being freshly energized. Although it appears for only a very few milliseconds, it can cause severe damage to the entire energy storage system, including the sources and loads. To save the RESS system from the starting inrush current and peak overshoot voltages, this paper proposes a five-phase digital soft-start control algorithm for a high-power DAB-IBDC converter that was implemented at a renewable energy storage system aimed at developing an intelligent self-powered energy zone. The proposed five phase digital soft-start algorithm can alone solve the startup transients without the use of any additional hardware. First, it prevents the output current and voltages from transients, such as the inrush current and peak overshoot voltages, by ensuring that the output current does not increase too rapidly while starting up. Second, it also eliminates the large backflow inrush current released by a partially discharged energy storage device at the starting period. Third, it helps achieve a simple super compact size DAB-IBDC converter with a simple elegant design by ensuring the control and soft-start in digital technology.

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A High Efficiency Dual-Mode Buck Converter IC For Portable Applications

Cited by 27 publications

References 0 publications

Wide-Input Range Dual Mode PWM / Linear Buck Converter with High robustness ESD Protection Circuit

Wide-Input Range Dual Mode PWM / Linear Buck Converter with High robustness ESD Protection Circuit

Fast Transient Buck Converter Using a Hysteresis PWM Controller

Digital Soft Start Implementation for Minimizing Start Up Transients in High Power DAB-IBDC Converter

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