The design of a new generation of LED driver ICs must break the traditional DC/DC topology design concept. If constant power is used, the step-down type of hysteresis control is not used, and the fixed-frequency constant current control is adopted to solve the problem that the light source generated by the halogen-type electronic transformer is blinking and the multiple lamps are not connected in parallel.
LED as a green, energy-saving, energy-saving, long-life fourth-generation lighting fixtures have sprung up and are receiving attention, and are developing in full swing. Since the LED light source is a semiconductor device operating at a low voltage (VF=2-3.6V) and a large current (IF=200mA-1500mA), it is necessary to provide a suitable direct current to emit light normally. The technology of direct current (DC) driving DCLED light source has become more and more mature.
Lighting driver IC voltage range is wider
Since the power supply used in our daily lighting is high-voltage alternating current (AC100V-220V), we must use the buck technology to obtain a lower voltage. It is often used to reduce voltage by transformer or switching power supply, and then convert alternating current (AC) into direct current (DC). ), and then converted into a DC constant current source, in order to promote the LED light source to emit light.
The system application scheme of DC drive LED light source must be: transformer + rectification or switching power supply + constant current source (see the right picture). There must be some space in the LED luminaire to house the power module, but the space for the E27 standard screw luminaire is very limited and difficult to place. Whether it is via transformer + rectification or switching power supply step-down, the system will have a certain amount of loss. When DCLED lamps are switched between AC and DC, about 15% to 30% of the power is lost, and the system efficiency is difficult to achieve more than 90%. Therefore, if the LED light source can be directly driven by alternating current (AC), the system application scheme will be greatly simplified, and the system efficiency can be easily achieved by more than 90%.
From this point of view, LED driver ICs (integrated circuits) are critical devices in LED luminaires. At present, there are more than 10 research and development and production manufacturers of domestic LED driver ICs.
System application scheme for DC drive LED light source
The basic technical element of LED light source applications is that it must meet its VF (forward voltage) and IF (forward current) requirements. VF is to establish a normal working state for the LED light source, and IF causes the LED light source to emit light, and the brightness of the LED is proportional to the current. In response to the development of LED driver IC technology, the input voltage (Vin) range of the LED driver IC will be wider (DC5V-45V), and the output constant current accuracy is higher (1%). In view of the fact that more and more LED lamps use multiple high-power LED series application technology, the output voltage of the new generation LED driver IC is increased to 60V-100V, which requires high-voltage process to produce wafers for LED driver ICs. The improvement of the output voltage of the LED driver IC has opened up a new market for its applications in high voltage requirements such as automotive electronics, automotive lighting, and high-brightness lighting.
China Resources Weiwei Technology Co., Ltd. is a domestic integrated circuit design company that intervenes early in LED driver IC design and production. Its PT4115 is a typical Vin wide voltage input (DC6V-30V), high current constant current output (1.2A) DC. /DC buck LED driver IC, PT4115 is a continuous inductor, current conduction mode buck constant current source, it has a wide DC 6V to 30V input voltage range, breakdown voltage 45V, output 200mA---1200mA The constant DC can meet the requirements of driving 1-7 high-power LEDs in series or N low-power LEDs in series and parallel. The driving constant current size can be set according to the application scheme.
New design breaks traditional topology
LED light source is a long-life light source with a theoretical life of up to 50,000 hours. However, if the application circuit design is unreasonable, the circuit components are not properly selected, and the LED light source is not well cooled, it will affect its service life. Especially in the application circuit, the electrolytic capacitor, which is the output filter of the AC/DC rectifier bridge, has a service life of less than 5,000 hours, which has become a roadblock for manufacturing long-life LED lamp technology. The only viable and advanced solution is to design and produce a new generation of LED driver ICs that can eliminate electrolytic capacitors in the application circuit. A new LED driver ICTK5401 in Japan does not need to use electrolytic capacitors on the application circuit, and the lifetime can reach 40,000-50,000. Hours, just matching the LED life. The use of this IC can reduce the PCB area to 40%, saving space in the power module, which is also an important aspect of LED lighting design.
The design of a new generation of LED driver ICs must break the traditional DC/DC topology design concept. If constant power is used, the step-down type of hysteresis control is not used, and the constant frequency constant current control is adopted to solve the problem that the light source flashing and the multiple lamps are not connected in parallel by using the halogen lamp electronic transformer. In addition, LED driver ICs must be certified for EMC, safety, CE, UL, etc. in a variety of application circuits. The application circuit strives for simplicity and reduces the amount of components used, which is also a requirement for customers to reduce costs. Isolated and non-isolated applications have always been the focus of business security and efficiency, and the duty cycle of PWM controllers continues to increase.
0.5W-3W LED light source and LED driver IC The new generation of chips integrated in a CMC package has been produced in small batches, indicating that LED driver ICs are moving toward highly integrated multi-chip (CMC) packages. The new generation of special-structure ACLED light source technology that can directly drive light by alternating current (AC) can become a new era of LED lighting technology.
Turnkey solutions into a trend
IC manufacturers tend to provide end users with solutions that can be directly used for production, making the upstream and downstream of the industry chain directly docked, saving time and money, and being popular.
In recent years, integrated circuit manufacturers have stepped up the development of system application solutions for the final product application side in order to enable end-users to invest in high-volume production applications in a short period of time and shorten the customer's design cycle. They adopt a turnkey project model, so that the downstream terminal factories that purchase the main chip can be put into production in a short period of time according to the scheme. Thereby shortening the time to market. For example, the mobile phone chip solution provided by Taiwan MTK is a system solution that can be used to directly produce mobile phones; China Resources Weiwei Technology Co., Ltd. not only designs and produces LED driver ICs, but also provides LED lamp manufacturers with direct use for the production of MR16, E27, PAR30, PAR38, DEMO (Demonstration) and circuit diagram, bill of materials for fluorescent lamps. This turnkey solution has become an important strategy for closer cooperation, survival and common development of upstream companies that produce integrated circuits and downstream companies that produce final products.
Related Links
LED drive technology status
The characteristics of the LED driver IC are the consistency and constancy of the current output. At present, domestic LED driver IC products still use the traditional DC/DC buck, boost constant current mode and constant current source circuit composed of PWM (power management) controller. Currently, these two types of LED driver IC technology are still available. In the early stages of development, especially due to advances in wafer production processes, it has an impact on the growing demand for higher voltage applications. With the expansion of lighting applications, LED driver ICs are moving toward mid- to high-end and highly integrated, multi-chip package (CMC) technologies.
LED as a green, energy-saving, energy-saving, long-life fourth-generation lighting fixtures have sprung up and are receiving attention, and are developing in full swing. Since the LED light source is a semiconductor device operating at a low voltage (VF=2-3.6V) and a large current (IF=200mA-1500mA), it is necessary to provide a suitable direct current to emit light normally. The technology of direct current (DC) driving DCLED light source has become more and more mature.
Lighting driver IC voltage range is wider
Since the power supply used in our daily lighting is high-voltage alternating current (AC100V-220V), we must use the buck technology to obtain a lower voltage. It is often used to reduce voltage by transformer or switching power supply, and then convert alternating current (AC) into direct current (DC). ), and then converted into a DC constant current source, in order to promote the LED light source to emit light.
The system application scheme of DC drive LED light source must be: transformer + rectification or switching power supply + constant current source (see the right picture). There must be some space in the LED luminaire to house the power module, but the space for the E27 standard screw luminaire is very limited and difficult to place. Whether it is via transformer + rectification or switching power supply step-down, the system will have a certain amount of loss. When DCLED lamps are switched between AC and DC, about 15% to 30% of the power is lost, and the system efficiency is difficult to achieve more than 90%. Therefore, if the LED light source can be directly driven by alternating current (AC), the system application scheme will be greatly simplified, and the system efficiency can be easily achieved by more than 90%.
From this point of view, LED driver ICs (integrated circuits) are critical devices in LED luminaires. At present, there are more than 10 research and development and production manufacturers of domestic LED driver ICs.
System application scheme for DC drive LED light source
The basic technical element of LED light source applications is that it must meet its VF (forward voltage) and IF (forward current) requirements. VF is to establish a normal working state for the LED light source, and IF causes the LED light source to emit light, and the brightness of the LED is proportional to the current. In response to the development of LED driver IC technology, the input voltage (Vin) range of the LED driver IC will be wider (DC5V-45V), and the output constant current accuracy is higher (1%). In view of the fact that more and more LED lamps use multiple high-power LED series application technology, the output voltage of the new generation LED driver IC is increased to 60V-100V, which requires high-voltage process to produce wafers for LED driver ICs. The improvement of the output voltage of the LED driver IC has opened up a new market for its applications in high voltage requirements such as automotive electronics, automotive lighting, and high-brightness lighting.
China Resources Weiwei Technology Co., Ltd. is a domestic integrated circuit design company that intervenes early in LED driver IC design and production. Its PT4115 is a typical Vin wide voltage input (DC6V-30V), high current constant current output (1.2A) DC. /DC buck LED driver IC, PT4115 is a continuous inductor, current conduction mode buck constant current source, it has a wide DC 6V to 30V input voltage range, breakdown voltage 45V, output 200mA---1200mA The constant DC can meet the requirements of driving 1-7 high-power LEDs in series or N low-power LEDs in series and parallel. The driving constant current size can be set according to the application scheme.
New design breaks traditional topology
LED light source is a long-life light source with a theoretical life of up to 50,000 hours. However, if the application circuit design is unreasonable, the circuit components are not properly selected, and the LED light source is not well cooled, it will affect its service life. Especially in the application circuit, the electrolytic capacitor, which is the output filter of the AC/DC rectifier bridge, has a service life of less than 5,000 hours, which has become a roadblock for manufacturing long-life LED lamp technology. The only viable and advanced solution is to design and produce a new generation of LED driver ICs that can eliminate electrolytic capacitors in the application circuit. A new LED driver ICTK5401 in Japan does not need to use electrolytic capacitors on the application circuit, and the lifetime can reach 40,000-50,000. Hours, just matching the LED life. The use of this IC can reduce the PCB area to 40%, saving space in the power module, which is also an important aspect of LED lighting design.
The design of a new generation of LED driver ICs must break the traditional DC/DC topology design concept. If constant power is used, the step-down type of hysteresis control is not used, and the constant frequency constant current control is adopted to solve the problem that the light source flashing and the multiple lamps are not connected in parallel by using the halogen lamp electronic transformer. In addition, LED driver ICs must be certified for EMC, safety, CE, UL, etc. in a variety of application circuits. The application circuit strives for simplicity and reduces the amount of components used, which is also a requirement for customers to reduce costs. Isolated and non-isolated applications have always been the focus of business security and efficiency, and the duty cycle of PWM controllers continues to increase.
0.5W-3W LED light source and LED driver IC The new generation of chips integrated in a CMC package has been produced in small batches, indicating that LED driver ICs are moving toward highly integrated multi-chip (CMC) packages. The new generation of special-structure ACLED light source technology that can directly drive light by alternating current (AC) can become a new era of LED lighting technology.
Turnkey solutions into a trend
IC manufacturers tend to provide end users with solutions that can be directly used for production, making the upstream and downstream of the industry chain directly docked, saving time and money, and being popular.
In recent years, integrated circuit manufacturers have stepped up the development of system application solutions for the final product application side in order to enable end-users to invest in high-volume production applications in a short period of time and shorten the customer's design cycle. They adopt a turnkey project model, so that the downstream terminal factories that purchase the main chip can be put into production in a short period of time according to the scheme. Thereby shortening the time to market. For example, the mobile phone chip solution provided by Taiwan MTK is a system solution that can be used to directly produce mobile phones; China Resources Weiwei Technology Co., Ltd. not only designs and produces LED driver ICs, but also provides LED lamp manufacturers with direct use for the production of MR16, E27, PAR30, PAR38, DEMO (Demonstration) and circuit diagram, bill of materials for fluorescent lamps. This turnkey solution has become an important strategy for closer cooperation, survival and common development of upstream companies that produce integrated circuits and downstream companies that produce final products.
Related Links
LED drive technology status
The characteristics of the LED driver IC are the consistency and constancy of the current output. At present, domestic LED driver IC products still use the traditional DC/DC buck, boost constant current mode and constant current source circuit composed of PWM (power management) controller. Currently, these two types of LED driver IC technology are still available. In the early stages of development, especially due to advances in wafer production processes, it has an impact on the growing demand for higher voltage applications. With the expansion of lighting applications, LED driver ICs are moving toward mid- to high-end and highly integrated, multi-chip package (CMC) technologies.
What are the advantages of Explosion-proof Screen Protectors?
What is an Explosion-proof Screen Protector? This is a Soft Film made of imported PET material. It has very good flexibility and can help you solve the problems of tilting, white edges, and not suitable for curved screens. Can closely fit the curved edge of the screen.
The PET Screen Protector is made of imported materials from Korea. It is equipped with a proprietary "self-healing" function that can automatically repair minor scratches on the film. Daily protection measures to prevent accidental knocks and drops. The screen strengthens the screen and reduces the chance of cracking. Broken tempered glass is no longer replaced frequently.
1. Edge coverage: The Explosion-proof Screen Protective Film is made of PET flexible material, which is very suitable for the screen of your device, and 100% provides excellent edge coverage, and there is no gap between the edges of the device
2. High-definition resolution: high-definition display, true display of the original screen color.
3. Original touch experience: The oleophobic coating surface of the screen protector can provide your phone with original texture and perfect touch screen response speed. The Soft Film also has oleophobicity and water resistance, which can prevent unnecessary fingerprints.
4. Self-repairing scratches: The Screen Protection Film with self-repairing function can automatically repair tiny scratches and bubbles within 24 hours.
5. Anti-seismic and explosion-proof: PET material has high strength, flexibility and elasticity, which can fully decompose the impact force and prevent the mobile phone from breaking
Explosion-Proof Matte Protective Film,Matte Explosion-Proof Screen Protector,Anti-Scratch Matte Film,Anti-Impact Matte Film
Shenzhen TUOLI Electronic Technology Co., Ltd. , https://www.hydrogelprotectors.com