- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A Design of 6.8 mW All Digital Delay Locked Loop With Digitally Controlled Dither Cancellation for TDC in Ranging Sensor
摘要： This paper presents a design of 6.8 mW all digital delay locked loop (ADDLL) with digitally controlled dither cancellation (DCDC) for time to digital converter (TDC) in ranging sensors. ADDLL uses the accumulator (ACC) to control the delay of digitally controlled delay line (DCDL) during phase locking which utilizes less power and area as compared to analog delay locked loop (DLL). In the lock state, the ACC value dithers due to the closed loop operation. A digital controller is proposed to detect the lock state, performs dither cancelation and selects the optimum ACC value for controlling the delay of the replica DCDL for TDC operation. It helps the jitter reduction in the ADDLL. Additionally, it provides robustness against glitches, false locking and unlocking in a noisy environment. The ADDLL peak to peak jitter and RMS jitter at 625 MHz are 6.5 ps and 1.2 ps respectively. The ADDLL including DCDC is implemented on 0.18 μm CMOS technology with an operational range of 350～900 MHz. It consumes only 6.8 mW at 625 MHz power with 1.8 V power supply. The area utilization is 0.06 mm2.
关键词： digital controller,time to digital converter (TDC),jitter,All digital delay locked loop (ADDLL),light detection and ranging (LIDAR)
更新于2025-09-19 17:13:59
-
Performance Analysis of Single-Stage LED Buck Driver Topologies for Low-Voltage DC Distribution Systems
摘要： The demand for lean protein is the main reason for raising domesticated birds in poultry farms for the purpose of farming meat or eggs for food. In these poultry farms, artificial lighting system is an essential factor for the success of the commercial production of egg layers and broilers. Lighting loads connected to the existing AC system requires DC power. Nearly 25% of the total power consumed in India is by lighting loads. Therefore, low-voltage DC distribution system is the new requirement of electrical network to improve energy conservation. In this paper, an energy efficient single-stage LED driver topology is proposed as a better alternative to fluorescent lights used in poultry farms. The proposed topology is a phase-shifted buck converter with reduced size of passive components. The converter is mathematically modelled and designed for a power of 24 W LED lights. An experimental prototype is developed for the proposed converter and the results are validated in terms of cost, energy savings, and energy efficiency with various other LED driver topologies like conventional buck converter and interleaved buck converter. Further to justify the outcome of the proposed LED driver, a case study is also done for poultry farms.
关键词： energy savings,Phase-Shifted Buck Converter (PSBC),dimming control,digital controller,LED driver
更新于2025-09-19 17:13:59
-
[IEEE 2018 IEEE International Conference on Information and Automation for Sustainability (ICIAfS) - Colombo, Sri Lanka (2018.12.21-2018.12.22)] 2018 IEEE International Conference on Information and Automation for Sustainability (ICIAfS) - A Robust Driver for RGB LEDs
摘要： For running applications based on RGB LEDs, a dc-dc buck converter associated with linear control is mostly used to manage the constant current of LED. In this paper, the driver to run RGB LEDs gives 180 mA constant outputs current and a PWM control scheme has been utilized, which determines the desired brightness levels with a dimming frequency of 10000 Hz. Previously there used to be a dimming option for dimming each array of LED color, through the dimming controller circuit; approximately 93%, 90% 93% efficiencies, were found for the green, red and blue color LEDs’ arrays respectively. A digital controller based on PID controller has been created, with the option of using digital dimming by using current mirroring with a transistor (for the intent of switching system). The proposed LED driver system contains the constant source of current to maintain the small drive voltage across the LEDs which lead in the reduction of power dissipation in the transistor, i.e., NPN, which eventually increases the efficiency of the whole system in return. With the application of the 12V supply voltage, the efficiencies of RGB LEDs are found up to 98.94%, 99.37%, and 99.37% correspondingly.
关键词： RGB LED Driver,DC-DC Converter,Digital Controller
更新于2025-09-16 10:30:52
-
LED Boost Driver Topologies for Low Voltage DC Distribution Systems in Smart Structured Buildings
摘要： Most of the loads connected to the existing AC distribution system operate with low voltage DC power. Hence, there is a requirement to convert AC into DC power. Often there are many inefficiencies associated with AC to DC power conversion. To enhance the energy conservation, low voltage DC distribution system (LVDCDS) is suggested in this paper. Forty percent of the total power consumed in India is by lighting loads which make use of DC power. LVDCDS is an ideal choice to power lighting loads in residential and commercial buildings. This paper presents a detailed study of four different single stage, interleaved, non-isolated light emitting diode (LED) drivers for lighting load. All the topologies are developed in hardware and tested experimentally with controller implementation to provide a constant power of 70 W to power LED lights in the campus building. The installation cost, payback period, and energy savings for the converters connected to LVDCDS are analyzed and discussed in particular.
关键词： digital controller,LED boost drivers,energy savings,energy efficient building
更新于2025-09-11 14:15:04
-
Image processing of the weld pool and tracking of the welding line in pulsed MAG welding
摘要： In order to trace the welding line in the lap welding, weld pool in the pulsed MAG welding was taken by using the CCD camera. The weld pool was observed in the front and rear to the welding direction. The features of the weld pool were investigated to recognize the welding pool. The welding line was detected by using image processing and the digital controller was designed to trace the welding line.
关键词： Digital controller,Image processing,Weld pool image,MAG welding
更新于2025-09-10 09:29:36