scholarly journals Experimental Study on Voltage Sag Tolerance of LED Electronic Display

2021 ◽  
Vol 2136 (1) ◽  
pp. 012023
Author(s):  
Yidan Song ◽  
Shangshu Guan ◽  
Haijiang Yao ◽  
Shun Tao
Keyword(s):  
Power Supply ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Switching Power Supply ◽  
Switching Power ◽  
Electronic Displays ◽  
Test Platform ◽  
The Status ◽  
Electronic Display ◽  
Related Experimental Work

Abstract Widely used LED electronic displays have high requirements for power quality. Because of the status quo of LED technology update and the lack of related experimental work, this paper first analyzes the hardware composition of LED electronic display and switching power supply module. In addition, the paper points out that the transient tolerance of LED screens is mainly determined by switching power supply modules. Then, a test platform was built, and a certain type of LED screen was selected to investigate the influence of voltage temporary drop value and duration, phase jump, and initial Angle of temporary drop on the tolerance of LED electronic display. It provides data support for evaluating and managing the effects of voltage sags on LED electronic displays and the design of power supply schemes.

Research on Regulator Performance Analysis and Test Method of Switching Power Supply

2013 ◽  
Vol 347-350 ◽  
pp. 777-782
Author(s):  
Huai Feng Wang ◽  
Ming Li ◽  
Wu Zhong Luo
Keyword(s):  
Power Supply ◽  
Electronic Devices ◽  
Test Method ◽  
Normal Operation ◽  
Switching Power Supply ◽  
Source Effect ◽  
Switching Power ◽  
Power Regulator ◽  
Test Platform ◽  
Technology Applications

Power supply's performance is directly related to the performance of electronic devices. It puts forward higher requirements on the performance of computer switching power regulator,with widely using of high-power in family and computer overclocking technology applications. In this paper, switching power supply is modeled by using the simulink of matlab, simulations are performed to analyze the influence of source effect and loads effect on the performance of switching power regulator. Switching power regulator performance is affected both by source effect and loads effect during normal operation of computer, regulator performance under the influence of a single factor is difficult to test. For this problem, a feasible test method of switching power supply regulator performance is proposed. By building a test platform, the proposed method is verified.

The Design of 5V/100W High Frequency Switching Power Supply

2013 ◽  
Vol 834-836 ◽  
pp. 1221-1224
Author(s):  
Hong Zhuan Cai ◽  
Li Bai
Keyword(s):  
Power Supply ◽  
High Frequency ◽  
High Efficiency ◽  
Design Method ◽  
Switching Power Supply ◽  
Widespread Application ◽  
Forward Converter ◽  
Switching Power ◽  
Dc Power ◽  
Important Field

Switching power supply is an important field of application of power electronic technology, the high frequency switching DC power supply with high efficiency, small size, light weight and other advantages obtain the widespread application. The application of synchronous rectifier technology, photoelectric coupling isolation technology and the active clamp forward converter design high frequency switching power supply with 16~40V DC input and 5V/100W DC output . its operational principle is analyzed, and using LM5026 control chip describes design method of switching power supply.

H∞ Control to the BUCK-Type Switching Power Supply with Small Perturbation

2013 ◽  
Vol 347-350 ◽  
pp. 1358-1362
Author(s):  
Zi Сheng Li ◽  
Li Xu ◽  
Bao Shan Yuan
Keyword(s):  
Power Supply ◽  
Current Control ◽  
Control Mode ◽  
State Variables ◽  
Switching Power Supply ◽  
Small Perturbations ◽  
Switching Power ◽  
Current Sampling ◽  
Output Filter ◽  
Filter Capacitor

The purpose in this paper is the design of the control to switching power supply for small perturbations. By the theoretical analysis and calculation, with the output filter inductor current and filter capacitor voltage switching power supply as two state variables, the conclusion is that control of the output filter inductor current sampling do well in the anti-jamming. The simulation is made for verification. And comparing the results, the current control mode shows a very strong anti-interference ability.

Photoelectric Sensor Circuit and Image Segmentation Method for Radar System

2021 ◽  
Vol 16 (2) ◽  
pp. 170-178
Author(s):  
Ting Da
Keyword(s):  
Loss Function ◽  
Power Supply ◽  
Three Dimensional ◽  
Reverse Bias Voltage ◽  
Switching Power Supply ◽  
Phase Compensation ◽  
Image Region ◽  
Low Input ◽  
Switching Power ◽  
Photoelectric Sensor

In this exploration, based on the principle and system parameters of laser three-dimensional (3D) radar imaging technology, the corresponding photoelectric sensor circuit scheme is formulated. The sense circuit of avalanche photon diode (APD) converts the signal through the transresistance amplifier circuit. Then, LMH6629 is selected as a precision amplifier with low input noise voltage and low input error current. The capacitance is used as a compensation element to compensate the phase. For the power supply scheme, choosing the mode of switching power supply and LDO to work together can improve the efficiency of power supply and reduce the output of current ripple. At the same time, semantic segmentation is carried out for the obtained photoelectric images. Based on the traditional spatial pyramid pooling algorithm, the fusion of mean intersection over union and cross information entropy loss function is introduced to improve the weight of local image region. In the experiment, Multisim software is used to simulate the circuit. The APD reverse bias voltage is set to 90 V, and the multiplication coefficient is 98.7. The feedback resistance, bandwidth, phase compensation capacitance and other parameters are further calculated. It is found that there is obvious self-excited phenomenon in the output waveform of the transresistance amplifier without phase compensation capacitor. When the feedback capacitance reaches 0.8 pF, the oscillation phenomenon is obviously reduced; further calculation shows that the bandwidth of transresistance amplifier is 230 MHz, and the noise of APD power supply is mainly caused by BUCK switching power supply switch when the bottom noise of oscilloscope is ignored. However, the noise is suppressed under the action of the back-end LDO device; after the loss function is introduced, the contour of the photoelectric image is preserved completely, and then the more accurate segmentation results are obtained.

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