LED lighting has broad prospects for full penetration into various fields
Recently, a very hot topic that has been discussed in China is the rise in industrial electricity prices and the implementation of stepped charges for residential electricity plans, which means that users will pay more for electricity. The rise in electricity bills highlights energy tensions and awakens the awareness of energy conservation among ordinary people, which will become a powerful driving force for the development of energy-saving technologies.
In the field of power consumption, the consumption from the field of lighting cannot be underestimated. At present, many countries, including China, are vigorously promoting energy-saving lamps, hoping to ease the pressure of power shortage through the popularization of energy-saving lighting equipment. Compared to incandescent lamps, energy-saving lamps such as compact fluorescent lamps (CFLs) and linear fluorescent lamps (LFLs) consume less energy (only about one-fifth the equivalent of incandescent lamps), but these traditional energy-saving lamps contain highly toxic chemicals. Mercury has an adverse effect on the environment. On the other hand, high-brightness light-emitting diodes (HB-LEDs) have seen considerable improvements in light output, energy efficiency, and cost in recent years. They have many advantages such as small size, low-voltage operation, and environmental protection. A force that cannot be underestimated.
LED applications are becoming more popular
With the continuous advancement of technology and the reduction of cost, LED lighting has been widely used in many fields. However, in comparison, the penetration ratio of LED lighting in general lighting fields such as light bulbs, recessed lights, street and district lighting, task lights, landscape lighting, commercial building lighting and billboard text circuit lighting is still low, less than 2%. Far below other lighting types. At present, price is a factor that restricts the rapid popularity of LED lighting in the field of general lighting. However, Laurent Jenck, director of LED general lighting and power marketing and systems engineering at ON Semiconductor, cited the history of semiconductor development, pointing out that with the expansion of applications and applications, the cost of LED lighting will gradually become consumer applications. LaurentJenck expects LED general lighting to begin to enter mainstream home applications within five years.
Normative agencies around the world are also actively developing and publishing relevant LED lighting energy efficiency specifications. The US version of the "Energy Star" version 1.1 solid-state lighting specification came into effect in February 2009. In China, the China National Institute of Standardization, which is responsible for the setting of energy efficiency standards, is taking the lead in researching China's LED lighting energy efficiency standards in the coming year.
Innovation, efficiency, energy saving - bright prospects for LED
Due to the promising future of LED lighting applications, to promote its continuous development, it is necessary to select a suitable driving solution for different LED lighting applications. Whether it's a battery-powered application or an application powered directly from an AC or DC line, ON Semiconductor offers a suitable energy-efficient LED driver solution.
In battery-powered mobile device backlight applications, different LED drive technologies can be used, such as linear current drivers, inductive step-up switching regulators, and charge pump drivers. These kinds of drive technologies have their own characteristics and requirements, so they can provide them with the LED drive technology that best suits their products. The linear current driver is easy to use, has no switching noise, and the number of external components is very small, but the forward voltage of this driver must be lower than the battery voltage, and the energy efficiency is related to the input voltage and the LED forward voltage; the inductor boosting switch is stable. The LED string current of the press is highly matched, and it has high energy efficiency in the battery line voltage range, supporting long-string LED high-power and high-voltage operation. The typical product of the charge pump type driver adopts a capacitor-based switching topology and integrates a linear driver. For tight current matching, with high switching frequency and few external components.
In automotive applications, different LED drivers are also required depending on the current. A new trend in automotive electronics is to replace the currently used resistive drivers with linear constant current regulators in combined taillight applications with currents of only tens of milliamps (mA).
The resistive drive scheme is simple and low cost, but has low energy efficiency, and also faces problems or challenges such as high current stress at high voltage, LED coding, and thermal runaway. With this in mind, ON Semiconductor has introduced innovative dual- and three-terminal linear constant current regulators (CCRs) that use ON Semiconductor's self-biased transistor (SBT) technology to provide low-cost advantages and support wide voltages. The range provides higher energy efficiency and higher current regulation accuracy than the resistive driver, which is more conducive to protecting the LED.
In the field of building lighting, ON Semiconductor's energy-efficient LED driver solutions can be used. For example, CAT4103, CAT4109 three-channel linear constant current driver is a high-brightness RGB LED driver for emerging high-brightness, high-visual LED architecture lighting. RGBLED pixel control. The CAT4106 is a multi-channel step-up LED driver for larger, general-purpose LCD backlight applications that can drive up to 40 white LEDs, providing a total of 6W of LED output power and helping designers improve backlight efficiency. In addition, large-size LCD TVs with LED backlights are increasing, especially for side-lit LED backlights, which usually require six single-string LED strips (each string of LEDs is considered an LED channel). Each of the existing 6-channel side-lit LED TVs includes a dedicated driver IC, an inductive DC-DC boost converter, and a switch. And ON Semiconductor's multi-channel linear LED driver CAT4026 for large-size edge-lit LED-backlit LCD TVs supports multiple channels and can control 6 LED channels with a single IC. The energy efficiency target range is higher than 90%, and the typical energy efficiency is more. Up to 94%, and protection against fault conditions such as LED open circuit and excessive LED short circuit.
In general lighting applications, different power applications require different LED drive schemes. In low-power applications, ON Semiconductor's NCL30000 off-line LED driver with power factor correction can be used, compatible with TRIAC dimming. This driver directly drives the LED and has a constant current output current regulation function; the power factor is higher than 0.9, conforms to the IECC harmonic content standard, exceeds the "Energy Star" specification; at a low output power level of 5 to 15W, Energy efficiency above 80% is ideal for this type of general lighting application. In high-power street lighting applications, an integrated solution such as ON Semiconductor's NCP1607PFC controller and NCP1397 resonant half-bridge controller can be used, with an energy efficiency of 92%-93% and reduced electromagnetic interference.
to sum up
With the overall improvement of LED brightness, energy efficiency and cost, LED lighting is further expanding from small-scale mobile device backlights, camera flash, large display and other professional subdivision applications, into automotive lighting, larger LCD backlights and even universal The lighting market has bright prospects. Designers targeting these applications need to choose a high-performance, energy-efficient LED lighting driver solution. ON Semiconductor offers a wide range of energy-efficient LED drivers and regulators to meet the needs of different applications, current requirements and power levels, and a tested, energy-efficient GreenPointTM reference design that helps designers shorten design cycles and accelerate products Listing process. (Edit: Led Fish)
24v DC Worm Gear Motor is the most common used worm gear motor. Dc Worm Gear Motor has a low efficiency, so while working, it is necessary to save energy as much as possible.
DC Worm Gear Motor including a dc motor with a worm gearbox. A worm gearbox means the output shaft is vertical with the dc motor shaft. Connecting the gears with the motor, there is a worm gear. DC Worm Gear Motor has very low efficiency, normally for the first stage, the efficiency will loss at least half. However, dc worm gear motor is widely applied on some products need with self-lock function. Like the automatic range hood in the kitchen, or the roller blind motor.
The dc worm gear motor has the following characteristics:
1. Achieve great speed reduction through high gear ratio. Normally reduce the speed as low as 3-5 rpm.
2. Achieve vertical transform by the worm gear
3. With self-lock function to prevent the back-driving.
24V Dc Worm Gear Motor,24V Dc Motor Gear Motor,24V Dc Motor Gear Reduction,24V Dc Gear Motor
SHENZHEN DONGMING MOTOR CO., LTD. , http://www.dmdcmotor.com