An Auto-Zero-Voltage-Switching Quasi-Resonant LED Driver With GaN FETs and Fully Integrated LED Shunt Protectors

Li, Lisong; Gao, Yuan; Jiang, Huaxing; Mok, Philip K. T.; Lau, Kei May

doi:10.1109/jssc.2017.2783685

Cited by 14 publications

(8 citation statements)

References 18 publications

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“…Much research in LED driver design has attempted to improve power efficiency with various driver topology and control schemes. For instance, several works have utilised quasi-resonant topology in conjunction with GaN power field effect transistors (FETs) to enhance efficiency [4,5] by minimising switching loss. Specifically, in [4], LED driver switches designed at high frequencies in order to reduce the inductance value to microhenry range, zero voltage switching (ZVS) were realised automatically with the proposed controller to minimise switching losses.…”

Section: Introductionmentioning

confidence: 99%

92.5% Average Power Efficiency Fully Integrated Floating Buck Quasi-Resonant LED Drivers Using GaN FETs

et al. 2020

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LEDs are highly energy efficient and have substantially longer lifetimes compared to other existing lighting technologies. In order to facilitate the new generation of LED devices, approaches to improve power efficiency with increased integration level for lighting device should be analysed. This paper proposes a fully on-chip integrated LED driver design implemented using heterogeneous integration of gallium nitride (GaN) devices atop BCD circuits. The performance of the proposed design is then compared with the conventional fully on-board integration of power devices with the LED driver integrated circuit (IC). The experimental results confirm that the fully on-chip integrated LED driver achieves a consistently higher power efficiency value compared with the fully on-board design within the input voltage range of 4.5–5.5 V. The maximal percentage improvement in the efficiency of the on-chip solution compared with the on-board solution is 18%.

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Section: Introductionmentioning

confidence: 99%

92.5% Average Power Efficiency Fully Integrated Floating Buck Quasi-Resonant LED Drivers Using GaN FETs

et al. 2020

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“…The emerging wide band-gap semiconductor devices, e.g. gallium nitride (GaN) based device, are promising to replace the conventional silicon power switches and diodes due to the significant decrease of parasitic capacitances [6]- [8]. However, these advanced devices currently show less reliability compared to their silicon counterparts and are still too expensive for general lighting applications.…”

Section: Introductionmentioning

confidence: 99%

“…However, these advanced devices currently show less reliability compared to their silicon counterparts and are still too expensive for general lighting applications. The switching losses can also be effectively minimized with the help of a resonant or quasi-resonant topology, in which an extra inductor is added to resonate with the parasitic drain capacitor [8]- [10]. Thus, the drain voltage falls to zero or near-zero before the turn-on switching to reduce Yuan Gao, Member, IEEE, Lisong Li, Member, IEEE, Kwun Hok Chong, and Philip K.T.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid LED Driver With Improved Efficiency

Gao

Chong

et al. 2020

IEEE J. Solid-State Circuits

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“…In the case of the LED driver, the reliability issue is more complex as the driver comprises several components which may be affected by a number of inter-related parameters, including stability, overshoot/undershoot, and component reliability [42], [82].…”

Section: B Led Driver Reliabilitymentioning

confidence: 99%

“…The off-chip dimming topology is prevalent in contemporary backlighting systems for Liquid Crystal Displays due to its ensuing wide dimming range [82]. Figure 2.10 depicts a typical block diagram of the LED driver with off-chip dimming, where power switch MD is controlled by the dimming signal, DIM.…”

Section: Dimming Rangementioning

confidence: 99%

Design and realization of high-performance LED drivers for automotive lighting applications

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This Ph.D. program pertains to the design and monolithic realization of Light Emitting Diode (LED) drivers for automotive lighting where the imperative parameters are high power-efficiency and high reliability. The grand objectives thereto are substantial improved specifications over the state-of-the-art, including power-efficiency, reliability, current driving capability, and dimming range. To achieve the said grand objectives, the specific objectives are to decouple, and hence mitigate the following two major design trade-offs that limit the performance of contemporary automotive LED drivers. The first trade-off is between high reliability and high current driving capability, and applies to both single-phase and multi-phase LED drivers. Specifically, to achieve high current driving capability, the contemporary single-phase LED driver typically suffers from low reliability arising from large current ripples. On the other hand, the multi-phase LED driver is highly advantageous to provide high current driving capability, but suffers from low reliability because of the ensuing subharmonic oscillation. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel Pulse-Width-Modulation (PWM)-based dual-phase LED driver in Global Foundries (GF) 130nm BCDLite process. To achieve high current driving capability, we adopt a dual-phase power stage. To achieve high reliability, we propose an Average Current Control to eliminate the subharmonic oscillation by considering the complete inductor-current profile vis-à-vis peak current adopted/reported elsewhere. To further improve the reliability, we propose an accuracy-enhanced current sensor to ascertain good current balance in the adopted dual-phase power stage. With measurements on our prototype LED driver ICs embodying our aforesaid adoption and vi proposed circuits, we demonstrate, to the best of our knowledge, for the first time that the trade-off between high reliability and high current driving capability is decoupled, i.e., an LED driver uniquely featuring high reliability, yet high current driving capability. The second trade-off is between high power-efficiency and wide dimming range. Specifically, a wide dimming range is derived by means of high switching frequency, hence the ensuing reduced settling time of the LED current. This, however, in turn leads to a degradation of the power-efficiency due to increased switching losses. To decouple this limiting trade-off, we propose the design and monolithic realization of a novel fully soft-switched LED driver in GF 130nm BCDLite process. We achieve wide dimming range by operating at high switching frequencies, but the high switching does not compromise the power-efficiency. Using a fully soft-switching approach, the ensuing switching losses are negligible. This is achieved by a proposed Hysteretic Soft-Switching Controller (HSSC) and proposed circuitries, i.e., a voltage detector, current sensor, and a level shifter. The HSSC enables complete soft-switching, including zerovoltage switc...

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An Auto-Zero-Voltage-Switching Quasi-Resonant LED Driver With GaN FETs and Fully Integrated LED Shunt Protectors

Cited by 14 publications

References 18 publications

92.5% Average Power Efficiency Fully Integrated Floating Buck Quasi-Resonant LED Drivers Using GaN FETs

92.5% Average Power Efficiency Fully Integrated Floating Buck Quasi-Resonant LED Drivers Using GaN FETs

A Hybrid LED Driver With Improved Efficiency

Design and realization of high-performance LED drivers for automotive lighting applications

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