scholarly journals Tractive Properties of DC Linear Motor under Constant Current Drive

1976 ◽  
Vol 96 (3) ◽  
pp. 107-114
Author(s):  
Susumu Aiba ◽  
Yoshifumi Amemiya
Keyword(s):  
Linear Motor ◽  
Current Drive ◽  
Constant Current

The Design of Sound and Light Controlled Corridor LED Lamp Based on Double Integration Detection

2013 ◽  
Vol 347-350 ◽  
pp. 93-97
Author(s):  
Xiu Lei Cui ◽  
Yong Gao Jin
Keyword(s):  
Power Consumption ◽  
Supply Voltage ◽  
High Sensitivity ◽  
Current Drive ◽  
Constant Current ◽  
Detection Accuracy ◽  
Double Integration ◽  
Detection Circuit ◽  
Micro Power ◽  
Operation Stability

The design of a high-sensitivity LED lamp with low standby consumption, sound and light controlled type based on the micro-power consumption characteristic of MK6A12P is presented in this paper. The standby power consumption is less than 0.07W. And the problem of the light sense unit influenced by the change of the supply voltage is solved by the design of double integration detection circuit, thereby, the detection accuracy of brightness is improved. The service life of LED lamp is greatly prolonged with constant current drive. It is proved by the experiment that the LED lamp has the advantages of simple circuit structure, high operation stability and high cost performance.

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.

The Design of Intelligent Street Lighting Control System

2013 ◽  
Vol 671-674 ◽  
pp. 2941-2945 ◽  
Author(s):  
Jing Rong
Keyword(s):  
Access Network ◽  
Electric Energy ◽  
Power Line ◽  
Current Drive ◽  
Constant Current ◽  
Core Network ◽  
Electric Energy Consumption ◽  
Wireless Communication Network ◽  
Power Line Carrier ◽  
The City

The paper puts forward a modification plan which combines the wireless communication network with power line communication to reduce energy waste in the city lighting system at night. The system framework is divided into three layers, the backend server controls the centralized controllers through the core network; each centralized controller controls the lamps through the access network; node controller on each street light works as a terminal which controls the light according to the commend receives from the centralized controllers through PLC. The system combines wireless communications, power line carrier, LED circuit constant current drive with PWM stepless dimming technology. The application results show that the system can reduce the electric energy consumption obviously, and the intelligent street lamps operate stably and reliably.

Constant Current Drive for Resistive Sensors Based on Generalized Impedance Converter

2008 ◽  
Vol 57 (10) ◽  
pp. 2290-2296 ◽  
Author(s):  
D.R. Munoz ◽  
J.S. Moreno ◽  
C.R. Escriva ◽  
S.C. Berga ◽  
A.E.N. Anton
Keyword(s):  
Current Drive ◽  
Constant Current ◽  
Impedance Converter

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 of High-Power LED Drive Circuit with Economical High Power Factor Based on NCP1200

2014 ◽  
Vol 556-562 ◽  
pp. 1806-1810 ◽  
Author(s):  
Long Teng Wang ◽  
Yong Gao Jin
Keyword(s):  
Power Factor ◽  
High Power ◽  
Low Cost ◽  
Current Drive ◽  
Constant Current ◽  
Led Driver ◽  
Amplitude Control ◽  
High Power Factor ◽  
High Power Led ◽  
Driver Circuit

This paper proposes a high-power LED driver circuit with economical high power factor based on universal chip NCP1200. NCP1200 itself doesn’t have the function of APFC, however, by adding a simple amplitude control circuit in the periphery without using special dedicated APFC chip, the APFC rectification mode can be achieved at work, which greatly reduce the pulse current caused by first-time rectification, the power factor can be as high as 98%, and it can achieve the goal of constant current drive in the meantime. The designed circuit is simple, low cost, stable and reliable work ability and it has high cost performance.

A novel model-based approach for resistance estimation using rise time and sensorless position control of sub-millimetre shape memory alloy helical spring actuator

2017 ◽  
Vol 29 (6) ◽  
pp. 1050-1064 ◽  
Author(s):  
M Sreekanth ◽  
Abraham T Mathew ◽  
R Vijayakumar
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Rise Time ◽  
Position Control ◽  
Sensorless Control ◽  
Open Loop ◽  
Current Drive ◽  
Constant Current ◽  
Helical Spring ◽  
Heating And Cooling

Shape memory alloy shows considerable strain during heating and cooling. This effect is due to its phase transformation with temperature. Due to this property, shape memory alloys can be deployed for physical actuation in place of conventional actuators in bio-medical and bio-mimicking robots. Sub-millimetre diameter shape memory alloy wires wound as helical springs are also used for this purpose. Due to their small size, it is difficult to use sensors for temperature or displacement measurements of shape memory alloy springs. This article attempts to demonstrate that the rise time of the current through a sub-millimetre diameter shape memory alloy helical spring is directly proportional to its displacement. To characterize the rise time–displacement hysteresis, a constant current drive with overcurrent protection is developed. The data generated are utilized to implement an open-loop sensorless control. A method to estimate the resistance from the rise time is proposed with which the temperature of the shape memory alloy during actuation can be obtained. The design avoids using an analogue-to-digital converter for the direct measurement of voltage and current for measuring the resistance variation in the shape memory alloy under actuation. This helps in the development of a new sensorless control using only the digital Input/Output pins of a microcontroller/microprocessor.

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.

Sign in / Sign up

Export Citation Format

Share Document