Light-emitting diodes (LEDs) are next-generation lighting components used in buildings and indoor lighting. They have much higher luminous energy efficiency than incandescent lamps. However, they must be driven by dedicated electronic drivers to ensure that they are not exposed to excessive stress, so that they continue to provide The longevity declared in the product specifications. For this technical premise, this article will explore how to use a simple LED driver circuit to provide the necessary reliability and minimize the cost of the luminaire.
LED characteristics for more efficient interior lighting design LED lighting characteristics have allowed 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 light strips. Inside, or easy to hide in cabinets and stairs to achieve more design flexibility. In addition, the main LED operating parameters are relatively simple, as long as the current is kept constant, and is lower than the maximum current can withstand, and further work within the design parameters without suffering from excessive stress, LED life will be one hundred times longer than incandescent bulbs, Become another key advantage. Therefore, if the driver circuit meets the LED specifications, the light source output will be able to maintain a constant, basically the service life of more than 50,000 hours.
On the other hand, the design guidelines for buildings and indoor lighting fixtures must be in accordance with globally prevailing specifications, and their luminaires must operate at 50 or 60 Hz frequencies within the range of 85 to 265 VAC full general-purpose voltage specifications. The power supply circuit covering this universal voltage requirement has been designed, and in production, it is expected to be based on this design and further penetrate the computer and mobile phone market. 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 driver circuit.
Reducing the design burden Keeping the current constant The rise of solutions Because traditional power supplies provide accurate voltage output and different current levels, limiting the current can be done by connecting a resistor in series with the LED. The prerequisite for this kind of design is to know the voltage across the LED (string) clearly, and this voltage will not change following the LED temperature change. Unfortunately, LED forward voltages typically change with temperature, so LED manufacturers must code their components based on forward voltage so that luminaire manufacturers can build luminaires that match the LED forward voltage at a fixed temperature. design.
With this design in mind, circuits that do not need to be LED-encoded are more attractive because they save time for LED manufacturers and the LED prices produced are cheaper. Not only that, but due to security issues, the LED forward voltage also has a negative temperature coefficient (ie, the forward voltage drops when the temperature rises), which may cause the circuit to overheat and run out of control. Therefore, the designer must be required to construct a protection circuit. Pen extra cost.
Therefore, the best solution for the LED driver circuit is to monitor the current and keep the current constant. This type of circuit is not affected by the LED forward voltage and does not require LED coding, and eliminates the negative temperature coefficient of the LED in the forward voltage. Coupled with the wide application of such circuits, they can be complex switching regulators or linear regulators with feedback loops. Complex switching regulators are ideally suited for high-light output applications, such as street lighting that focuses on luminous efficiency.
It can be seen that buildings and indoor lighting fixtures are suitable for simple, economical and robust hybrid circuit designs. Although the performance requirements may not be as high as a complex switching regulator, the low cost and simple design architecture make it a pole. Attractive choice.
Niu Huiping said that the high investment in the research and development of LED lighting products and the high cost of raw materials used in production have caused the high price of the products. Therefore, it is impossible to find a breakthrough in the price advantage that most people value most. In this case, the government subsidized The important role has emerged. Nowadays, we plan to develop high-end customers such as large-scale factories and urban tunnels as the service objects of the company's products. The degree of recognition of products is also increasing year by year.
LED characteristics for more efficient interior lighting design LED lighting characteristics have allowed 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 light strips. Inside, or easy to hide in cabinets and stairs to achieve more design flexibility. In addition, the main LED operating parameters are relatively simple, as long as the current is kept constant, and is lower than the maximum current can withstand, and further work within the design parameters without suffering from excessive stress, LED life will be one hundred times longer than incandescent bulbs, Become another key advantage. Therefore, if the driver circuit meets the LED specifications, the light source output will be able to maintain a constant, basically the service life of more than 50,000 hours.
On the other hand, the design guidelines for buildings and indoor lighting fixtures must be in accordance with globally prevailing specifications, and their luminaires must operate at 50 or 60 Hz frequencies within the range of 85 to 265 VAC full general-purpose voltage specifications. The power supply circuit covering this universal voltage requirement has been designed, and in production, it is expected to be based on this design and further penetrate the computer and mobile phone market. 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 driver circuit.
Reducing the design burden Keeping the current constant The rise of solutions Because traditional power supplies provide accurate voltage output and different current levels, limiting the current can be done by connecting a resistor in series with the LED. The prerequisite for this kind of design is to know the voltage across the LED (string) clearly, and this voltage will not change following the LED temperature change. Unfortunately, LED forward voltages typically change with temperature, so LED manufacturers must code their components based on forward voltage so that luminaire manufacturers can build luminaires that match the LED forward voltage at a fixed temperature. design.
With this design in mind, circuits that do not need to be LED-encoded are more attractive because they save time for LED manufacturers and the LED prices produced are cheaper. Not only that, but due to security issues, the LED forward voltage also has a negative temperature coefficient (ie, the forward voltage drops when the temperature rises), which may cause the circuit to overheat and run out of control. Therefore, the designer must be required to construct a protection circuit. Pen extra cost.
Therefore, the best solution for the LED driver circuit is to monitor the current and keep the current constant. This type of circuit is not affected by the LED forward voltage and does not require LED coding, and eliminates the negative temperature coefficient of the LED in the forward voltage. Coupled with the wide application of such circuits, they can be complex switching regulators or linear regulators with feedback loops. Complex switching regulators are ideally suited for high-light output applications, such as street lighting that focuses on luminous efficiency.
It can be seen that buildings and indoor lighting fixtures are suitable for simple, economical and robust hybrid circuit designs. Although the performance requirements may not be as high as a complex switching regulator, the low cost and simple design architecture make it a pole. Attractive choice.
Niu Huiping said that the high investment in the research and development of LED lighting products and the high cost of raw materials used in production have caused the high price of the products. Therefore, it is impossible to find a breakthrough in the price advantage that most people value most. In this case, the government subsidized The important role has emerged. Nowadays, we plan to develop high-end customers such as large-scale factories and urban tunnels as the service objects of the company's products. The degree of recognition of products is also increasing year by year.
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