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The loader is an earth-rock construction machine widely used in road, railway, construction, hydropower, port, mining and other construction projects. It is mainly used for shovel loading bulk materials such as soil, sand, lime, coal, etc. Hard soil, etc., for light shovel. Different auxiliary work devices can be used for loading and unloading of bulldozers, lifting and other materials such as wood.
Main scope:Loader, Concrete Grinding machines, Floor Polishing Machines, Road Line Marking Machines, Truck Cranes, Road Rollers, Excavators, Concrete Leveling Machines, Power Trowels and other Construction machinery .
Jining oking tec co.,ltd, established in 2010, is a professional manufacturer engaged in the research, development, production, sale and service of Loader, Concrete Grinding machines, Floor Polishing Machines, Road Line Marking Machines, Truck Cranes, Road Rollers, Excavators, Concrete leveling machines, Power Trowels and other Construction machinery .
We are located in Jining city,Shandong province with convenient transportation access. Dedicated to strict quality control and thoughtful customer service, our experienced staff members are always available to discuss your requirements and ensure full customer satisfaction.
In recent years, we have introduced a number of advanced production equipment, and also have an excellent production team and a complete quality assurance system to ensure that each batch of goods is delivered to customers in a timely and high quality.
wheel loader, mini loader, backhoe loaders, loader, used wheel loaders, small wheel loader, tractor loader Shandong Nicosail Group Co., Ltd. , https://www.diggerexcavator.com
Light-emitting diodes (LEDs) are the next-generation lighting components used in buildings and indoor lighting. They are much more efficient than incandescent lamps. However, they must be driven by dedicated electronic circuits to ensure they are not subject to excessive stress. The long life claimed in the product specifications. For this technical premise, this article will explore how to use simple LED driver circuits to provide the necessary reliability and minimize the cost of the fixture.
LED characteristics and indoor lighting design are more efficient LED lighting features have enabled interior lighting designers to further design new lighting solutions. For example, LEDs are small in size and can be densely arranged to allow them to be placed in flexible lighting strips. Inside, or easy to hide in the cabinets and stairs, to achieve more design flexibility. In addition, the main operating parameters of the LED are relatively simple, as long as the current is kept constant and lower than the maximum current that can be withstand, further working within the design parameters without suffering from excessive stress, the LED life will be one hundred times longer than the incandescent bulb. Become another key advantage. Therefore, if the drive circuit meets the LED specifications, the output of the light source will remain constant, and the service life can exceed 50,000 hours.
On the other hand, the design guidelines for buildings and indoor lighting fixtures must be globally compliant, and their luminaires must operate at a frequency of 50 or 60 Hz over a full range of universal voltage specifications of 85 to 265 VAC. The power supply circuit covering this universal voltage requirement has been designed and is in production, and it is expected to further penetrate the computer and mobile phone market based on this design in the future. It must be noted that these power supply designs are optimized for the end product, but are not necessarily the best solution for the LED drive circuit.
Lighten the design burden and keep the current constant. Since the traditional power supply provides accurate voltage output and different current levels, a resistor can be connected to the LED to limit the current. A prerequisite for such a design is to clearly know the voltage across the LED (string) and this voltage will not change as the LED temperature changes. Disadvantageously, the LED forward voltage typically varies with temperature, so LED manufacturers must encode their components based on forward voltage, allowing luminaire manufacturers to build luminaires that match the LED forward voltage at a fixed temperature. design.
With this design consideration, circuits that do not require LED coding are more attractive because they save LED manufacturers time and produce LEDs that are cheaper. Not only that, because of the safety problem, the LED forward voltage also has a negative temperature coefficient (that is, the forward voltage drops when the temperature rises), which may cause the circuit to overheat and lose control. Therefore, the designer must also require the designer to construct the protection circuit, which is also a Pen extra cost.
Therefore, the best solution for the LED drive circuit is to monitor the current and keep the current constant. This type of circuit is not affected by the LED forward voltage, does not require LED coding, and eliminates the effect of the LED on the negative temperature coefficient of the forward voltage. In addition, such circuits can be used in a wide range of applications, from complex switching regulators to linear regulators with feedback loops, while complex switching regulators are ideal for high-light output applications such as street lighting with luminous efficacy.
It can be seen that both buildings and indoor lighting fixtures are suitable for simple, economical and rugged hybrid circuit design. Although their performance requirements may not be as high as complex switching regulators, the low cost and simple design architecture make them extremely polar. Attractive choice.
In the construction of roads, especially in high-grade roads, loaders are used for the filling and excavation of subgrade works, asphalt mixing materials and aggregate and loading of cement concrete yards. In addition, you can carry out operations such as pushing soil, leveling the ground, and pulling other machinery. Because the loader has the advantages of fast operation speed, high efficiency, good maneuverability and light operation, it has become one of the main types of earth and stone construction in engineering construction.
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