scholarly journals Spice Modeling of LED Filament and its Simulation in Switch Drive Circuit

CONVERTER ◽  
2021 ◽  
pp. 356-365
Author(s):  
Qingmei LV
Keyword(s):  
Output Voltage ◽  
Piecewise Linear ◽  
Current Drive ◽  
Constant Current ◽  
Filament Lamp ◽  
Design Requirements ◽  
Drive Circuit ◽  
Equivalent Method ◽  
Circuit Output ◽  
Driving Circuit

When designing the LED filament lamp device and driving circuit at the beginning, software simulation is an indispensable step. It is necessary to verify whether the circuit output results are consistent with the requirements through simulation. In this paper, first measure the volt-ampere characteristics of the actual 1W LED filament strip, and applied the six-segment linear approximation model method for Spice modeling. The simulated volt-ampere characteristics of the 1W model were consistent with the measured volt-ampere characteristics of the 1W LED filament strip. Then use the driver chip HV9910B to design the LED filament lamp switch constant current drive circuit. Combined with the piecewise linear equivalent method, 3W, 4W, 5W LED filament lamp loads are modeled, the detailed design process of the entire circuit is analyzed, and the output voltage, current, inductance output current, MOS output voltage and other parameters of the whole circuit are simulated and verified. The results show that the output voltages are 71V, 142V, 71V, and the output currents are 30.4mA, 20.7mA, 51.1mA respectively under the circuit topology of 3W, 4W, and 5W LED filament lamp. When the inductor current works in CCM mode, the duty cycle of MOS output voltage meets the requirements, and the circuit output results are consistent with the design requirements.

Design of LED Lighting Uninterrupted Constant Current Power Supply

2014 ◽  
Vol 687-691 ◽  
pp. 3235-3238
Author(s):  
Xiao Min Han
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Switching Time ◽  
Power Transformer ◽  
Input Voltage ◽  
Current Drive ◽  
Constant Current ◽  
Duty Ratio ◽  
Valley Fill ◽  
Light Protection

This design uses ATMEG8L as the master chip, real-time detection the state of the main power supply DC voltage, by controlling the MOSFET has the ability to quickly turn off the main power and backup power to achieve seamless switching, switching time of less than 1ms; by controlling the MOSFET with the fast turn-off capability to achieve the main power supply and backup power seamless switching, switching time of less than 1ms; Valley-fill PFC circuit is used in the main power supply to ensure the power factor > 0.9, DC-DC buck circuit is composed of LM2576T - ADJ, when great fluctuations in input voltage, output voltage 8 v is very stable, error < 1%, DC-DC boost circuit composed by LM2577T-ADJ, the battery voltage decay process, to achieve a stable output voltage of 8V, LED constant current drive circuit composed by PT4115, adjustable output current and high precision, and then adjust the brightness of LED. Master control chip, through detecting the change of photosensitive resistance, control the duty ratio of PWM wave, In order to achieve LED brightness can be adjusted automatically with ambient light, Protection of the power transformer is perfect, efficiency > 85%.

Design and Application of High-Power LED Drive and Control Circuits

2013 ◽  
Vol 397-400 ◽  
pp. 1822-1827
Author(s):  
Chen Wu Li ◽  
Jian Zhang ◽  
Hao Yuan Ou
Keyword(s):  
High Power ◽  
Low Voltage ◽  
Light Emitting Diode ◽  
Electric Energy ◽  
Current Drive ◽  
Constant Current ◽  
Market Demand ◽  
High Power Led ◽  
Drive Circuit ◽  
Control Circuits

LED (light emitting diode) is a solid luminescent source of fairly wide uses, a type of electronic components capable of transforming electric energy to luminous energy, which, emitted from LED, is highly centralized and strongly directive. LED can be driven simply by low-voltage direct current. This paper chiefly introduces the actualization of drive circuits by the constant current pattern, and proposes a type of high-power LED constant current drive solutions based on the constant current drive circuit PT4115. This drive circuit is simple, highly efficient and cost effective, suitable for the market demand of solar energy products.

The Design of Semiconductor Laser Driver and Simulation Analysis of Constant Current Drive Circuit Based on Multisim 10

2014 ◽  
Vol 1061-1062 ◽  
pp. 1043-1048
Author(s):  
Li Bo Wu
Keyword(s):  
Semiconductor Laser ◽  
Simulation Analysis ◽  
Operating Mode ◽  
Simulation Software ◽  
Current Drive ◽  
Constant Current ◽  
Current Limit ◽  
Soft Start ◽  
Laser Driver ◽  
Drive Circuit

This article focused on the characteristics of the semiconductor laser, designed a practical semiconductor laser driver, which provides two ways of working, including constant current and constant power operating mode. The article focuses on the application of negative feedback theory in semiconductor laser driver design, and done simulation experiments study for constant current drive circuit with simulation software Multisim 10. This driver has soft-start delay protection, preventing electric shock and current limit protection circuits.

The Design of the High-Power LED Constant Current Drive Circuit and Research

2014 ◽  
Vol 1021 ◽  
pp. 196-199 ◽  
Author(s):  
Shu Qing Ma ◽  
Chuan Jun Wang
Keyword(s):  
High Power ◽  
New Technology ◽  
Current Drive ◽  
Constant Current ◽  
Optical Efficiency ◽  
High Brightness ◽  
Lighting Industry ◽  
High Power Led ◽  
Drive Circuit ◽  
Indoor And Outdoor

Abstract:Although high power LED is not large to replace the traditional lighting lamps and lanterns, but they are in indoor and outdoor decoration, special lighting is more and more widely used, so master the design of the high-power LED constant current drive technology, is very important to open up a new application of high power leds. LED by power and luminous brightness can be divided into high power LED, high brightness LED and common LED. In general, the power at least above 1 w high power LED, is more common with 1 w, 3 w, 5 w and 8 w and 10 w. Has large quantities of application are 1 w and 3 w LED, as w and 5 w, 8 to 10 w LED application is relatively small. Electronic and lighting industry are extremely concerned about the development and application of new technology of LED lighting. Constant current driver and improve the optical efficiency of LED is the two key problems of LED application design.

The Design of High Power LED Headlamp

2013 ◽  
Vol 423-426 ◽  
pp. 2098-2103
Author(s):  
Wen Lin Chen ◽  
Zhen An ◽  
Chao Qun Xiang ◽  
Chen Yang Liu ◽  
Li Na Hao
Keyword(s):  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Current Drive ◽  
Constant Current ◽  
Light Emitting ◽  
High Power Led ◽  
Drive Circuit ◽  
Led Headlamp ◽  
The Stability

With the continuous development of LED(Light-Emitting Diode) manufacturing technology, the high power white LED is gradually applied in the field of all kinds of lighting .But with working time increasing of LED chips, their junctions temperature continue increasing, which lead to decrease light-emitting efficiency and reliability of LED chip, and even be failure. According to the serious heating of LED chip, this paper has been designed a fin-type aluminum radiator panels using Pro/E software. A LED constant current drive circuit is designed by using LTC3783 chip. With the ANSYS software, thermal analysis was carried out on the fin-type aluminum radiator panels, and eventually the mode of high power LED headlamps is determined. The stability of the LED constant current drive circuit is verified through experiments. The LED headlamps of 90W worked for ten hours, and the results of the experiments showed that the LED chip junctions temperature measured are less than 75°Cso we can solve heat dissipation of high power LED headlamps effectively.

A novel adaptive general current drive circuit

2017 ◽  
Author(s):  
Yujie Chen ◽  
Ningmei Yu ◽  
Hejiu Zhang ◽  
Keren Li ◽  
Nan Lyu
Keyword(s):  
Current Drive ◽  
Drive Circuit

Design and Implementation of a New Drive Circuit of Monolithic Emitter-Switching Bipolar Transistor (ESBT)

2014 ◽  
Vol 668-669 ◽  
pp. 812-817
Author(s):  
De Hui Lin ◽  
Ping Lou ◽  
Hui Pin Lin
Keyword(s):  
High Voltage ◽  
Input Voltage ◽  
Bipolar Transistor ◽  
Soft Switch ◽  
Design And Implementation ◽  
Three Phase ◽  
Drive Circuit ◽  
Driving Circuit ◽  
Switch Circuit

This paper introduces a kind of monolithic emitter switched bipolar transistor (ESBT) for three-phase rectifier applications and other high voltage applications. This paper proposes an improved driving circuit, combining the soft switch circuit. We made a flyback circuit prototype which the rated power is 80W, and the maximum input voltage is 800V, and compared with the existing driving circuit.

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