Browsing by Author "Huang, Ming-Hsin"

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A Charge-Reservoir with Buck-Store and Boost-Restore (BSBR) Technique for High Efficient Conversion and Low Cost Solution of RGB LED Display Panels
(2009)
Hsieh, Chun-Yu
;
Yang, Chih-Yu
;
Huang, Ming-Hsin
;
Li, Don-Hwan
;
Chen, Chi-Lin
A boost converter with buck-store and boost-restore (BSBR) technique fabricated by 0.25 mu m CMOS BCD process can provide different supply voltages to drive series RGB LEDs in sequence for reducing the power consumption on the constant current generator. The proposed technique not only stores and restores extra charge during the transient time of the reference tracking response to improve the efficiency but also enhances the reference tracking response to greatly reduce load transition time. Experimental results show that the period of reference-tracking response can be improved. When the load current is 100mA, the periods of reference down-tracking and up-tracking are smaller than lops and 20 mu s, respectively. Furthermore, this technique also can provide a regulated voltage to drive the sub-block implemented in the LCD system. The maximum efficiency of charge recycling is up to 94% and the maximum efficiency of this boost converter is 92.5%. Experimental results demonstrate fast and efficient reference tracking performance is achieved by the proposed BSBR technique.
A dual-phase charge pump circuit with compact size
(2010-07-01)
Huang, Ming-Hsin
;
Hsieh, Chun-Yu
;
Fan, Po-Chin
;
Chen, Ke-Horng
;
電控工程研究所
In this paper, a regulated dual-phase charge pump with compact size is presented. By means of a nano-ampere switched-capacitor voltage reference (SCVR) circuit, the dual-phase charge pump regulator can reduce the quiescent current and the output ripple. Besides, a new power stage is proposed to define the stability of the overall system. Owing to the design of buffer stage, the charge pump regulator can extend bandwidth and increase phase margin. Thus, the transient response and driving capability can be improved. Beside, the proposed automatic body switching circuit can efficiently drive the bulk of the power p-type MOSFETs to avoid leakage and potential latch-up. This chip was fabricated by TSMC 0.35 mu m, 3.3 V/5 V 2P4 M CMOS technology. The input voltage range varies from 2.9 to 4.9 V for the lithium battery and the output voltage is regulated at 5 V. Experimental results demonstrate the charge pump can provide 50 mA maximum load current without any oscillation problems.
A High Efficiency and Compact Size 65nm Power Management Module with 1.2V Low-Voltage PWM Controller for UWB System Application
(2009)
Lee, Yu-Huei
;
Wang, Shih-Jung
;
Yang, Yao-Yi
;
Zheng, Kuo-Lin
;
Chen, Po-Fung
This 65 nm power management module with 1.2 V low-voltage PWM controller aims to integrate with ultra-wideband (UWB) system to get high efficiency and compact size. The on-chip pre-regulator with power conditioning circuit provides a constant and noiseless supply voltage. Thus, the voltage variation of battery has less effect on the low-voltage PWM controller. The proposed compensation enhancement multistage amplifier (CEMA) increases system loop gain and stabilizes the system without off-chip compensation circuit. With excellent line/load transient response, the proposed power management has the highest efficiency about 92% and 0.995 mm(2) silicon die area.
An Energy-Recycling (ER) Technique for Field Color Sequential LCD Backlight Driving
(2009)
Huang, Ming-Hsin
;
Tsai, Yueh-Chang
;
Hsieh, Chun-Yu
;
Chen, Ke-Horng
;
電控工程研究所
An energy-recycling (ER) technique has been proposed to implement high power conversion efficiency and low cost solution of field color sequential (FCS) LEDs backlight driving. One recycling capacitor C(R) and one power-transistor M(R) are added to synchronous boost converter to compose the ER function. When the output voltage of FCS-LEDs backlight driver switches from 40V to 26V for driving RGB LEDs during related time interval, ER technique stops to boost input voltage and switches to recycle energy from output terminal to the recycling capacitor CR. Thus, the output voltage can be rapidly switched between two different voltage levels with minimum power losses. The proposed ER technique has been fabricated by TSMC 40V BCD process. The experimental results demonstrate fast and efficient output voltage tracking performance is achieved by the proposed ER technique.
An Energy-Recycling (ER) Technique for Reducing Power Consumption of Field Color Sequential (FCS) RGB LEDs Backlight Module
(2009)
Huang, Ming-Hsin
;
Tsai, Yueh-Chang
;
Wang, Shih-Wei
;
Wu, Dian-Rung
;
Chen, Ke-Horng
A single driving module with field color sequential (FCS) LCD technology needs to dynamically switch output voltage between 40 V for 12 series G-and B-color LEDs and 26 V for 12 series R-color LEDs at related time cluster. Thus, an energy-recycling (ER) technology is proposed to accelerate voltage settling and save compressed energy when the driving voltage is pressed from 40 V to 26 V. Only one recycling capacitor and one Schottky diode are added into the power structure of synchronous boost converter for composing the proposed ER technology. A proposed energy-recycling mode (ERM) controller is plugged into a boundary current mode (BCM) controller to control energy delivering and recycling. The proposed ER technology was fabricated by TSMC 0.25 mu m 2.5/5 V BCD process. Experimental results demonstrate fast and efficient tracking performance of driving voltage is achieved.
Current Feedback Compensation (CFC) Technique for Adaptively Adjusting the Phase Margin in Capacitor-Free LDO Regulators
(2008-01-01)
Yang, Huan-Chien
;
Huang, Han-Hsiang
;
Chen, Chi-Lin
;
Huang, Ming-Hsin
;
Chen, Ke-Homg
Current feedback compensation technique (CFC) can adaptively adjust the phase margin for achieving better transient response than that with variant phase margin at different load current conditions. Not only fast transient response is attained due to suitable phase margin but also the minimum load current limitation can be greatly reduced to about 50 mu A without sacrificing bandwidth at tight load current condition. Besides, CFC technique can have high PSRR bandwidth with compatible compensation capacitors compared to the Q-reduction technique [6]. The capacitor-free LDO regulator with CFC technique is fabricated by TSMC 0.35 mu m 2P4M CMOS process with small compensation capacitors 5pF and 1.5pF. Experimental results demonstrate that the minimum load can be reduced to 50 mu A and transient response time with adaptively phase margin control is smaller than 1 mu s.
Current Feedback Compensation (CFC) Technique for Adaptively Adjusting the Phase Margin in Capacitor-Free LDO Regulators
(2008-01-01)
Yang, Huan-Chien
;
Huang, Han-Hsiang
;
Chen, Chi-Lin
;
Huang, Ming-Hsin
;
Chen, Ke-Homg
Current feedback compensation technique (CFC) can adaptively adjust the phase margin for achieving better transient response than that with variant phase margin at different load current conditions. Not only fast transient response is attained due to suitable phase margin but also the minimum load current limitation can be greatly reduced to about 50 mu A without sacrificing bandwidth at tight load current condition. Besides, CFC technique can have high PSRR bandwidth with compatible compensation capacitors compared to the Q-reduction technique [6]. The capacitor-free LDO regulator with CFC technique is fabricated by TSMC 0.35 mu m 2P4M CMOS process with small compensation capacitors 5pF and 1.5pF. Experimental results demonstrate that the minimum load can be reduced to 50 mu A and transient response time with adaptively phase margin control is smaller than 1 mu s.
Energy-Recycling (ER) Technique for a Direct-Lit Intelligent Power Management Backlight Unit (BLU)
(2010-10-01)
Huang, Ming-Hsin
;
Tsai, Yueh-Chang
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A field-sequential-color (FSC) liquid crystal display (LCD) technique with a direct-lit red, green, and blue LED backlight driver is proposed to achieve low weight, thin, perfect image quality, and low-power consumption of LCD television. The FSC technique performs a pseudorandom color sequence in the spatial and temporal domains to reduce color-breakup and motion-blur effects. The direct-lit RGB-LED backlight driver increases brightness, contrast, and uniformity due to the removal of a color filter. In this paper, the proposed FCS-LCD controller uses a single LED driver to switch the driving voltage alternatively between 36 V for driving 12-series G- or B-LEDs and 24 V for 12-series R-LEDs. The proposed energy-recycling technique can harvest the extra energy when the driving voltage switches from 36 to 24 V. Experimental results show that energy saving is higher than 17% of the conventional driving method.
Low-Ripple and Dual-Phase Charge Pump Circuit Regulated by Switched-Capacitor-Based Bandgap Reference
(2009-05-01)
Huang, Ming-Hsin
;
Fan, Po-Chin
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper proposes a low-ripple and dual-phase charge pump circuit regulated by switched-capacitor-based bandgap reference. Due to design of a buffer stage, a system can have better bandwidth and phase margin, and thus, the transient response and driving capability can be improved. Besides, the dual-phase control can reduce the output voltage ripple by means of only one closed-loop regulation in order to improve the power conversion efficiency. Besides, the proposed automatic body switching (ABS) circuit can efficiently drive the bulk of the power p-type MOSFETs to avoid leakage and potential latch-up. Usually, the regulated charge pump circuit needs a bandgap reference circuit to provide a temperature-independent reference voltage. The switched-capacitor-based bandgap reference circuit is utilized to regulate the output voltage. This chip was fabricated by Taiwan Semiconductor Manufacturing Company (TSMC) 0.35 mu m 3.3 V/5V 2P4M CMOS technology. The input voltage range varies from 2.9 to 5.5 V, and the output voltage is regulated at 5 V Experimental results demonstrate that the charge pump can provide 48 mA maximum load current without any oscillation problems.
Single-Inductor Dual Buck-Boost Output (SIDBBO) Converter with Adaptive Current Control Mode (ACCM) and Adaptive Body Switch (ABS) for Compact Size and Long Battery Life in Portable Devices
(2009)
Huang, Ming-Hsin
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A single-inductor dual buck-boost output (SIDBBO) converter is proposed to provide compact size and long battery life to portable devices. The proposed adaptive Current control mode (ACCM) reduces cross-regulation and power losses since ACCM adaptively controls inductor current for output regulating. Moreover, adaptive body switch (ABS) addresses potential leakage and latch-up, which occur when N-well bias vary with supply voltage. Owing to ACCM and ABS, efficiency achieves 92% and rises from 65% to 88% at heavy and light loads.
Single-Inductor Dual Buck-Boost Output (SIDBBO) Converter with Adaptive Current Control Mode (ACCM) and Adaptive Body Switch (ABS) for Compact Size and Long Battery Life in Portable Devices
(2009)
Huang, Ming-Hsin
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A single-inductor dual buck-boost output (SIDBBO) converter is proposed to provide compact size and long battery life to portable devices. The proposed adaptive current control mode (ACCM) reduces cross-regulation and power losses since ACCM adaptively controls inductor current for output regulating. Moreover, adaptive body switch (ABS) addresses potential leakage and latch-up, which occur when N-well bias vary with supply voltage. Owing to ACCM and ABS, efficiency achieves 92% and rises from 65% to 88% at heavy and light loads.
Single-Inductor Dual Buck-Boost Output (SIDBBO) Converter with Adaptive Current Control Mode (ACCM) and Adaptive Body Switch (ABS) for Compact Size and Long Battery Life in Portable Devices
(2009-01-01)
Huang, Ming-Hsin
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A single-inductor dual buck-boost output (SIDBBO) converter is proposed to provide compact size and long battery life to portable devices. The proposed adaptive Current control mode (ACCM) reduces cross-regulation and power losses since ACCM adaptively controls inductor current for output regulating. Moreover, adaptive body switch (ABS) addresses potential leakage and latch-up, which occur when N-well bias vary with supply voltage. Owing to ACCM and ABS, efficiency achieves 92% and rises from 65% to 88% at heavy and light loads.
Single-inductor dual-output (SIDO) DC-DC converters for minimized cross regulation and high efficiency in SoC supplying systems
(2007)
Huang, Ming-Hsin
;
Huang, Hong-Wei
;
Peng, Jiun-Yan
;
Tsai, Tzung-Ling
;
Lee, Min-Chin
A compact size and high efficient single-inductor dual-output (SIDO) DC-DC converter is proposed. Generally speaking, it is important to implement DC-DC converters with minimized components and small footprint area. However, large external compensated resistors and capacitors are required to stabilize DC-DC converters. The proposed SIDO DC-DC converter not only provides dual output sources but also has minimized cross regulation without using any external compensated components. Importantly, our proposed mode-switch technique corrects the mistakes in the previous design [1], which didn't mention the unstable condition. Besides, owing to dynamically adjusting DC current level like CCM operation, the SH)O DC-DC converter achieves high conversion efficiency. Experimental results show a high efficiency from 85% at light load condition to 94% at heavy load condition.
Single-inductor dual-output (SIDO) DC-DC converters for minimized cross regulation and high efficiency in soc supplying systems
(2009-08-01)
Huang, Ming-Hsin
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A compact size and high efficiency single-inductor dual-output (SIDO) DC-DC converter is proposed. The proposed SIDO DC-DC converter not only provides dual output sources (one buck and one boost outputs) but also has minimized cross regulation without using any external compensation components. Generally speaking, it is important to minimize the number of components and footprint area in the design of SIDO converters. However, usually large external compensation resistors and capacitors are required to stabilize DC-DC converters. Importantly, our proposed hysteresis mode operation can effectively avoid the oscillation problems that may exist in many SIMO designs. Furthermore, the dynamic dc current level like that in the continuous conduction mode (CCM) operation can make the proposed SIDO DC-DC converter achieve high conversion efficiency at light loads owing to small conduction loss. Experimental results show a high efficiency from 85% at light loads to 94% at heavy loads.
Single-inductor dual-output DC-DC converters with high light-load efficiency and minimized cross-regulation for portable devices
(2008-01-01)
Huang, Ming-Hsin
;
Chen, Ke-Horng
;
Wei, Wei-Hsin
;
交大名義發表
;
National Chiao Tung University
A peak-current control single-inductor dual-output (SIDO) DC-DC converter is proposed. The proposed SIDO DC-DC converter not only provides dual Output sources (one buck and one boost Outputs) but also has minimized cross regulation. Besides, a new hysteresis mode decided by a power decision circuit can effectively prevent SIDO converter from oscillating when power of buck is, larger than that of boost. SIDO converter achieves high conversion efficiency at light loads. Experimental results show a high efficiency from 85% at light loads to 94%, at heavy loads.
Single-Inductor Multi-Output (SIMO) DC-DC Converters With High Light-Load Efficiency and Minimized Cross-Regulation for Portable Devices
(2009-04-01)
Huang, Ming-Hsin
;
Chen, Ke-Horng
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A load-dependant peak-current control single-inductor multiple-output (SIMO) DC-DC converter with hysteresis mode is proposed. It includes multiple buck and boost output voltages. Owing to the adaptive adjustment of the load-dependant peak-current control technique and the hysteresis mode, the cross-regulation can be minimized. Furthermore, a new delta-voltage generator can automatically switch the operating mode from pulse width modulation (PWM) mode to hysteresis mode, thereby avoiding inductor current accumulation when the total power of the buck output terminals is larger than that of the boost output terminals. The proposed SIMO DGDC converter was fabricated in TSMC 0.25 mu m 2P5M technology. The experimental results show high conversion efficiency at light loads and small cross-regulation within 0.35%. The power conversion efficiency varies from 80% at light loads to 93% at heavy loads.
Sub-1 V Input Single-Inductor Dual-Output (SIDO) DC-DC Converter With Adaptive Load-Tracking Control (ALTC) for Single-Cell-Powered Systems
(2010-07-01)
Huang, Ming-Hsin
;
Tsai, Yu-Nong
;
Chen, Ke-Horng
;
電機工程學系
;
電控工程研究所
In this paper, a sub-1 V input single-inductor dual-output (SIDO) dc-dc converter with an adaptive load-tracking control (ALTC) technology is proposed for single-cell-powered portable devices. Having a minimal number of switches and an optimum current sequence, the proposed ALTC technique adaptively and accurately adjusts storage energy in the form of inductor current according to the actual load condition, without wasting surplus charge and without increasing cross regulation. Moreover, a current-mode ring oscillator with a self-bias current source circuit, in place of the conventional start-up ring oscillator, is proposed to produce a nearly constant system clock for the requirement of sub-1 V start-up procedure. Because the proposed current-mode ring oscillator operates between the start-up process and steady state of the SIDO dc-dc converter, its simplified design efficiently addresses the high switching frequency losses at sub-1 V start-up procedure, reducing chip area and power consumption. The proposed sub-1 V input SIDO dc-dc converter was fabricated via Taiwan Semiconductor Manufacturing Company 0.25 mu m 2.5 V/5 V Bipolar-CMOS-DMOS process, and the experimental results show high efficiency of 92% with a good cross regulation smaller than 10 mV.
Sub-1V Input Single-Inductor Dual-Output (SIDO) DC-DC Converter with Adaptive Load-Tracking Control (ALTC) for Single-Cell-Powered System
(2009)
Huang, Ming-Hsin
;
Tsai, Yu-Nong
;
Lee, Yu-Huei
;
Wang, Shih-Jung
;
Chen, Ke-Horng
In this paper, a sub-1V input single-inductor dual-output (SIDO) DC-DC converter with an adaptive load-tracking control (ALTC) technique is proposed for single-cell-powered portable devices. The ALTC technique adaptively and accurately adjusts storage charge in form of the inductor current according to actual load condition without wasting surplus charge and increasing cross-regulation through the use of minimized the number of switch and optimum current sequence. A current-mode ring oscillator with a self-bias current source (SBCS) circuit is proposed to replace conventional startup oscillator to produce a nearly constant system clock. The test chip was fabricated by TSMC 0.25 mu m 2.5 V/5 V BCD process and experimental results show a high efficiency of 92 % and a cross- regulation smaller than 10 mV.