A new high resolution PWM dimming strategy for LED lightings

Cho, Kyumin; Oh, Won‐Seok; Oh, Yeong Seok; In, Chigak

doi:10.1109/icit.2018.8352242

Cited by 7 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The light control module is QX7138 dimming module, mainly through the GPIO output PWM signal, according to the facial emotion and human body distance normalized weighted fusion, adjust the duty cycle of the PWM signal, and according to the direction of the gesture to determine the polarity of each PWM adjustment increment. [3]…”

Section: Led Pwm Dimming Drivermentioning

confidence: 99%

An intelligent dimming method based on human expression and gesture fusion recognition for smart home

Gao

Zhang

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

View full text Add to dashboard Cite

According to the demand of future smart home for lighting experience, an embedded intelligent LED dimming system based on the Raspberry Pi 4B is proposed. The system detects the human proximity distance and captures the gesture movements and other parameters through one ADPS-9960 sensor. An embedded miniature CSI camera OV5647 is used to collect the user's facial expression image data. PWM signal is generated from Raspberry Pi GPIO pin to control the LED illumination. PWM duty cycle range is determined by the fusion results of normalized weighted modulation from the expression type recognized from the facial images and the gesture detected byADPS-9960. Under the basic 3-tier CNN recognition model framework, the expression recognition is further enhanced by introducing the fusion with Face landmarks and HOG features. The experimental results show that the proposed dimming system can adaptively control the luminaire brightness according to the user's psychological state and behavior, and can light off when the person leaves the light, which meets the requirements of modern smart home for user light experience and energy saving.

show abstract

Section: Led Pwm Dimming Drivermentioning

confidence: 99%

An intelligent dimming method based on human expression and gesture fusion recognition for smart home

Gao

Zhang

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

View full text Add to dashboard Cite

show abstract

“…High-resolution pulse-width modulators (HRPWM) find applications in different fields of electrical engineering. Some examples are high resolution dimming of LED lighting to reduce flicker phenomenon [1], motor control applications [2], digitally-controlled DC-DC converters [3], [4] and other types of switched-mode power supplies that require low quantization noise in their PWM for the elimination of limit cycles and undesirable oscillations [5]. HRPWM are also being used for novel types of RF modulators based on switching amplifiers in which time resolution is one of the main limitations [6], [7].…”

Section: Introductionmentioning

confidence: 99%

A high‐resolution all‐digital pulse‐width modulator architecture with a tunable delay element in CMOS

Morales

Chierchie

Mandolesi

et al. 2020

Circuit Theory & Apps

View full text Add to dashboard Cite

An all-digital high-resolution pulse-width modulator in standard 130-nm CMOS technology is presented in this work. The architecture is based on a digitally-controlled delay element with variable time interval up to 50 ps and adjustable against process, voltage and temperature (PVT) variations. Post-layout simulation results show a linear response between the control word and delay. The PWM modulator uses several delay elements in a hybrid configuration that allows to obtain duty cycles with 18-bit resolution, without using a high-frequency internal clock while maintaining low power consumption.

show abstract

“…Therefore, digital pulse‐width modulators (DPWMs) are being used more and more widely. For example, DPWMs are used in the high‐resolution dimming of light‐emitting diode (LED) lighting to avoid flicker phenomenon, 1,2 motor control applications, 3 RF modulators based on switching amplifiers, 4 switching audio amplifiers to achieve high fidelity with low distortion, 5 and digitally controlled switched‐mode power suppliers 6,7 . Among these applications, digitally controlled switching power supplies are most widely used for high‐precision DPWM.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of a hybrid DPWM under 50 ps resolution based on general‐purpose FPGA

Zhang

et al. 2020

Circuit Theory & Apps

View full text Add to dashboard Cite

SummaryHigh‐resolution pulse width modulators are used widely in different fields of electrical engineering, such as dimming of light‐emitting diode (LED) lighting, motor control, RF modulators, audio amplifiers, and switch‐mode power supplies. To realize a high‐resolution digital pulse‐width modulator (DPWM) in a limited inner system clock, a simple implementation of a hybrid DPWM with the resolution under 50 ps based on a general‐purpose field‐programmable gate array (FPGA) is described. The multiplexer device implementing the fast carry‐chain path and an AND gate controlling the selection input are used as a delay unit. The manual routing or placement is not required in the proposed approach, which just needs some conditional constraints. Some different conditional constraints influencing the monotonicity and resolution of DPWM are discussed. Finally, a 1 MHz switching frequency DPWM with 40 ps resolution is experimentally demonstrated, with high monotonicity and linearity. Further, a synchronous buck with and without this high‐resolution DPWM is experimentally compared to illustrate the regulation resolution.

show abstract

A new high resolution PWM dimming strategy for LED lightings

Cited by 7 publications

References 6 publications

An intelligent dimming method based on human expression and gesture fusion recognition for smart home

An intelligent dimming method based on human expression and gesture fusion recognition for smart home

A high‐resolution all‐digital pulse‐width modulator architecture with a tunable delay element in CMOS

Design and implementation of a hybrid DPWM under 50 ps resolution based on general‐purpose FPGA

Contact Info

Product

Resources

About