Secondary-Side LLC Resonant Controller IC With Dynamic PWM Dimming and Dual-Slope Clock Generator for LED Backlight Units

Hong, Seong Wha; Kim, Hee Jin; Park, Joon Sung; Pu, Young Gun; Cheon, Jeongin; Han, Daehoon; Lee, Kang-Yoon

doi:10.1109/tpel.2011.2142326

Cited by 33 publications

(13 citation statements)

References 20 publications

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“…(4). In order to generate the frequency from the PLL loop, the constant parameters C SAW , V REF_H , I SAW and I B_SAW , which are determined by the V CTRL voltage, are needed [6].…”

Section: B Phase-locked Loopmentioning

confidence: 99%

A Wide Input Range, 95.4% Power Efficiency DC-DC Buck Converter with a Phase-Locked Loop in 0.18 ㎛ BCD

Kim¹,

Park²,

Park³

et al. 2016

Journal of Power Electronics

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This paper presents a DC-DC buck converter with a Phase-Locked Loop (PLL) that can compensates for power efficiency degradation over a wide input range. Its switching frequency is kept at 2 MHz and the delay difference between the High side driver and the Low side driver can be minimized with respect to Process, Voltage and Temperature (PVT) variations by adopting the PLL. The operation mode of the proposed DC-DC buck converter is automatically changed to Pulse Width Modulation (PWM) or PWM frequency modes according to the load condition (heavy load or light load) while supporting a maximum load current of up to 1.2 A. The PWM frequency mode is used to extend the CCM region under the light load condition for the PWM operation. As a result, high efficiency can be achieved under the light load condition by the PWM frequency mode and the delay compensation with the PLL. The proposed DC-DC buck converter is fabricated with a 0.18 µm BCD process, and the die area is 3.96 mm 2 . It is implemented to have over a 90 % efficiency at an output voltage of 5 V when the input range is between 8 V and 20 V. As a result, the variation in the power efficiency is less than 1 % and the maximum efficiency of the proposed DC-DC buck converter with the PLL is 95.4 %.

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“…(4). In order to generate the frequency from the PLL loop, the constant parameters C SAW , V REF_H , I SAW and I B_SAW , which are determined by the V CTRL voltage, are needed [6].…”

Section: B Phase-locked Loopmentioning

confidence: 99%

A Wide Input Range, 95.4% Power Efficiency DC-DC Buck Converter with a Phase-Locked Loop in 0.18 ㎛ BCD

Kim¹,

Park²,

Park³

et al. 2016

Journal of Power Electronics

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“…For the LLC resonant converter, the secondary-side resonant current I Sec reaches zero at the end of each switching cycle, which makes the burst-mode LLC converter a perfect candidate for dimmable LED driver [29] using burst mode. The proposed architecture is shown in Fig.…”

Section: B Burst-mode Llc Implemented By Vppmmentioning

confidence: 99%

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Zhao

Trescases

2014

IEEE Trans. Power Electron.

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This study presents a digitally controlled LLC resonant dc-dc converter targeted to white LED luminaires in smart buildings. The module uses the LED array both for ambient lighting and for transmitting sensor data. Visible light communication is implemented with minimal incremental cost, by operating the LLC converter in burst mode, without causing any visible disturbance. The converter operates with a regulated average LED current, while the burst pulse timing is controlled to minimize the current disturbance and reduce the output capacitance. Variable pulse position modulation is used to modulate the data, while supporting a range of dimming settings. A digital demodulation scheme that supports variable frequency transmission is demonstrated. The 80 W, 340-400 to 23 V converter prototype has an efficiency of 95.1%. The bit error rate of the complete system is fully characterized versus distance and angle.

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“…The system consists of an AC power input part and a PFC circuit for improving the power factor, a DC/DC converter for building output voltage, and an LED driver for providing a constant current to the LED load. A fly-back and LLC resonance converter are usually used for the DC/DC converter [14][15][16][17]. Figure 3a shows a buck DC/DC converter mostly used for constant LED current control.…”

Section: Introductionmentioning

confidence: 99%

Design of an LLC Resonant Converter for Driving Multiple LED Lights Using Current Balancing of Capacitor and Transformer

Han

Lim

2015

Energies

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Abstract:In this study, to achieve the constant current drive and brightness control without a separate pulse width modulation (PWM) converter, a single converter is designed and verified by experiment under the condition of a multiple LED light load with different output voltage (Vf) characteristics. In the case of the input of 140 Watt class level, the proposed converter can drive two voltage type 95 Vdc (300 mA) light emitting diode (LED) lights loads and 120 Vdc (300 mA) LED lights loads simultaneously. In addition, to improve commercial compatibility, the proposed converter is operated in a wide range of the input voltage 90~264 Vac; also, the Power Factor Correction (PFC) circuit with the input power factor of more than 0.9 is added. In order to maximize the power conversion efficiency, a LLC resonant converter is applied to the PFC block with the output voltage of 380 Vdc and to a DC-DC conversion block. Finally, reliability of the proposed converter is verified through total harmonic distortion (THD) and electromagnetic interference (EMI) tests.

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Secondary-Side LLC Resonant Controller IC With Dynamic PWM Dimming and Dual-Slope Clock Generator for LED Backlight Units

Cited by 33 publications

References 20 publications

A Wide Input Range, 95.4% Power Efficiency DC-DC Buck Converter with a Phase-Locked Loop in 0.18 ㎛ BCD

A Wide Input Range, 95.4% Power Efficiency DC-DC Buck Converter with a Phase-Locked Loop in 0.18 ㎛ BCD

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Design of an LLC Resonant Converter for Driving Multiple LED Lights Using Current Balancing of Capacitor and Transformer

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