Source switching circuit with low‐gate‐driving loss in high‐voltage buck light emitting diode driver

Liao, Tse-Ju; Hung, Chia‐Chieh; Chen, Chern‐Lin

doi:10.1049/iet-pel.2012.0495

Cited by 10 publications

(5 citation statements)

References 16 publications

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“…The most popular PFC converter is boost type, but it can only use for voltage step-up. Under the universal input voltage range, the voltage step-down [15][16][17] of the buck PFC [18][19][20][21] converter is preferred for LEDs applications. For the buck PFC converter, the zero-current detect strategy [10] as shown in Fig 1 is used to control switch turned-on, and additional winding is essential.…”

Section: Introductionmentioning

confidence: 99%

A high power factor LED driver with dual sampling loop feedback control

Lin

Kuo

Leng

et al. 2022

IEICE Electron. Express

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A LED driver with a high Power Factor (PF) under universal AC voltage input is investigated in this paper. The AC/DC buck converter with novel dual sampling loop feedback control is adopted to implement the LED driver application. When the main switch is on interval, the control loop does peak current sampling. When main switch is off interval, the control loop does average current sampling. Two control sampling loops are superimposed to regulate the main switch to adapt the AC input voltage and load alteration. Such a scheme can keep the characteristic of peak current control of fast response and avoid the control delay to bring about over current for damage LED. Compared with the conventional peak current control method, the proposed design does not need zero current detect winding and multiplier. Therefore, the circuit architecture of the proposed driver is cheaper. The proposed driver is applied to a 12W LED to analyze the operational principles and verify the practicality.

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Section: Introductionmentioning

confidence: 99%

A high power factor LED driver with dual sampling loop feedback control

Lin

Kuo

Leng

et al. 2022

IEICE Electron. Express

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“…Since LED is DC supplying component, a driver is required for LED lighting system [9]. Currently, LED drivers have two types : one is AC/DC driver [10][11][12][13][14][15][16][17][18][19] and the other is DC/DC driver [20][21][22][23][24][25]. For AC/DC converter, the main issue is for low harmonic distortion, high power factor correction (PFC) and high driving efficiency.…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective LED Dimming Driver With Single Chip Design for Smart Lighting System

2020

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For smart lighting system, this paper presents a high-power (60V/1A) single-chip driver for LED dimming using TSMC high-voltage process. The main circuit included analog circuit, power driver and digital control circuit with mixing-mode design methodology. The proposed digital dimming controls LED brightness increasing or decreasing with only two switches. The switches can be controlled by the auto mode or manual mode for user selection. All digital control circuits are embedded to the chip. Because of without the need of microprocessor for LED dimming, this chip is cost-effective design that can save the components of interface. To keep high-stable LED lighting, the dimming techniques used current mode rather PWM (Pulse Width Modulation) to reduce flicker. The multi-level current approach used 16 steps for LED lighting control. The step resolution is 6.25% for smart lighting system. With variable constant current control, this approach can achieve better lighting efficiency, reduce noise radiation and prolong LED lifetime for smart lighting systems. The maximum driving efficiency of the proposed chip can achieve near 98% as driving for 60W LED dimming.

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“…Common methods used for LED dimming can be classified as AM (amplitude-mode modulation), pulse-width modulation (PWM) and multi-current level. AM approach involves using a voltage divider to regulate the LED current; this is referred to as amplitude-mode control [2][3][4][5][6][7][8][9] that also is used for voltage converter. However, the relationship between voltage and LED current is exponential; achieving linearity requires an additional correction technique.…”

Section: Introductionmentioning

confidence: 99%

Chip implementation of high‐efficient light‐emitting diode dimming driver for high‐power light‐emitting diode lighting system

Hsia¹,

Sheu²,

Lai³

2015

IET Power Electronics

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This study presents a novel high-power light-emitting diode (LED) driver based on chip-level design. We propose a multi-level current approach to LED dimming, rather than pulsed current. The LED driving current can be controlled directly using a digital interface, making it more user-friendly. An analysis of output impedance and driving current demonstrates how the driver can be realised on a single chip. A prototype chip was designed using the second generation TSMC 0.25 μm high-voltage technology. The chip area, including I/O pads and power driver, is only 0.89 mm 2 . The proposed chip is able to drive a 60 W LED panel at maximum output by regulating current in 16 steps for LED dimming. Measurement results indicate that driving efficiency reaches 96% and lighting efficiency is 20% higher than that achieved using pulsed-width modulation. Furthermore, the proposed chip is able to reduce interference, improve lighting efficiency, and prolong the lifespan of LED devices.

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Source switching circuit with low‐gate‐driving loss in high‐voltage buck light emitting diode driver

Cited by 10 publications

References 16 publications

A high power factor LED driver with dual sampling loop feedback control

A high power factor LED driver with dual sampling loop feedback control

Cost-Effective LED Dimming Driver With Single Chip Design for Smart Lighting System

Chip implementation of high‐efficient light‐emitting diode dimming driver for high‐power light‐emitting diode lighting system

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