The traditional LED dimming solution is dimming with TRIAC thyristor, thyristor dimming has low efficiency (especially at light load), poor compatibility, etc.; and the emerging intelligent LED lighting solution: high cost, At present, the price is extremely unfriendly, and the standards are different, the chaos, the revolution has not been successful, and everyone still needs to work hard.
The market has dimming demand. During this period, the segmented dimming solution realized by the wall switch quickly seized the market share with his cost-effectiveness. For consumers, such programs have two tempting advantages: First, there is no need to change the original lighting lines; Second, easy to operate, nursery rhymes will be; for businesses, such programs have an advantage: rarely increased costs And the price can be increased a lot and the profit is increased.
At present, the segmentation dimming scheme is divided into two categories: switching power supplies (also divided into isolation and non-isolation schemes) and linear constant current classes. Ming Microelectronics offers segmented dimming solutions for all of the above categories. This article shares with you the implementation of the segmentation dimming scheme.
First, linear constant current class segmentation dimming scheme SM2212/13E series SM2212/3E is a series of segmentable adjustable brightness LED constant current driver chip. Applicable to 200Vac~240Vac or 90Vac~130Vac input voltage, constant current accuracy up to ±3%. According to the opening/closing wall (power) switch, the switch switching time is less than 0.5 seconds, and the output current is sequentially changed to change the brightness of the LED lamp. The adjustment ratio can be adjusted by an external REXT resistor. A typical circuit diagram is as follows:
This scheme is simple in circuit, cost-effective, and easy to produce. It can realize the "light engine" scheme of photoelectric integration, and realize the light engine, also called photoelectric module, as shown below:
This series includes SM2212EA (2-stage dimming), SM2213EA (3-stage dimming) without input electrolysis, high power factor output, SM2212EB (2-stage dimming) with input electrolysis and low power factor without stroboscopic. , SM2213EB (3-stage dimming), can use different products for different customers. At the same time, the power can be increased by parallel application, and the synchronization consistency of multiple lamps is good.
Take the SM2213EB's 3-band adjustment brightness application as an example. When turning on the wall power switch, change the output current in turn to change the brightness of the LED lamp. The adjustment ratio can be adjusted by an external REXT resistor.
Second, switching power supply class segmentation dimming scheme SM7390/SM7590 series 2.1 Non-isolated segmentation dimming scheme SM7390 series SM7390 is a high-end BUCK single-stage, high-precision high with source high power factor correction, three-stage dimming An efficient step-down LED constant current drive control chip. There are fewer peripheral devices and the solution cost is low.
· Wide voltage 85Vac~265Vac input · Constant current accuracy ± 5%
· Supports no-input electrolytic capacitor solution · Supports PF value greater than 0.9 · Constant current control patent technology · Supports non-isolated low-cost BUCK drive scheme · Inductor current critical conduction mode · Three-stage dimming function · 0.5-3 seconds switch Switching · Built-in self-recovery output open, short circuit protection, over temperature protection function 80V-240mA program DEMO as shown below:
2.2 Isolated Segmented Dimming Solution The SM7590 series SM7590 is a single-stage, high-precision, high-efficiency primary-side feedback LED constant current drive control chip with source high power factor correction and three-stage dimming. There are fewer peripheral devices and the solution cost is low. Applicable to the full range of input voltage from 85Vac to 265Vac, the constant current accuracy is within ±5%, and the PF value is greater than 0.9.
The SM7590 has the same function as the SM7390. The main difference is that the SM7590 is isolated and used in isolated panel lights and downlights. The typical circuit diagram is as follows:
Typical electrical parameters are as follows:
Summary <br> <br> Ming Microelectronics provides the above two types of segments dimming scheme, advantages and disadvantages. Linear constant current scheme (SM2212/3E): Simple solution, easy to batch and integrate, but only for single voltage input range, ie country with stable grid; switching power supply scheme: isolation (SM7590/2) and non-isolated (SM7390/2) Two-structured circuit that is compatible with the original isolation (SM7530/2) and non-isolated (SM7350/2) single-stage PFC solutions, without changing the board wiring, easy to replace, and low cost; At the same time, the internal sealing MOS can be used for low power, which further improves the cost performance. (This article is a microelectronics submission)
The market has dimming demand. During this period, the segmented dimming solution realized by the wall switch quickly seized the market share with his cost-effectiveness. For consumers, such programs have two tempting advantages: First, there is no need to change the original lighting lines; Second, easy to operate, nursery rhymes will be; for businesses, such programs have an advantage: rarely increased costs And the price can be increased a lot and the profit is increased.
At present, the segmentation dimming scheme is divided into two categories: switching power supplies (also divided into isolation and non-isolation schemes) and linear constant current classes. Ming Microelectronics offers segmented dimming solutions for all of the above categories. This article shares with you the implementation of the segmentation dimming scheme.
First, linear constant current class segmentation dimming scheme SM2212/13E series SM2212/3E is a series of segmentable adjustable brightness LED constant current driver chip. Applicable to 200Vac~240Vac or 90Vac~130Vac input voltage, constant current accuracy up to ±3%. According to the opening/closing wall (power) switch, the switch switching time is less than 0.5 seconds, and the output current is sequentially changed to change the brightness of the LED lamp. The adjustment ratio can be adjusted by an external REXT resistor. A typical circuit diagram is as follows:
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Figure 1 Schematic diagram of SM2212/3E segment dimming
This scheme is simple in circuit, cost-effective, and easy to produce. It can realize the "light engine" scheme of photoelectric integration, and realize the light engine, also called photoelectric module, as shown below:
Figure 2: SM2213EA three-stage dimming scheme
This series includes SM2212EA (2-stage dimming), SM2213EA (3-stage dimming) without input electrolysis, high power factor output, SM2212EB (2-stage dimming) with input electrolysis and low power factor without stroboscopic. , SM2213EB (3-stage dimming), can use different products for different customers. At the same time, the power can be increased by parallel application, and the synchronization consistency of multiple lamps is good.
Take the SM2213EB's 3-band adjustment brightness application as an example. When turning on the wall power switch, change the output current in turn to change the brightness of the LED lamp. The adjustment ratio can be adjusted by an external REXT resistor.
Second, switching power supply class segmentation dimming scheme SM7390/SM7590 series 2.1 Non-isolated segmentation dimming scheme SM7390 series SM7390 is a high-end BUCK single-stage, high-precision high with source high power factor correction, three-stage dimming An efficient step-down LED constant current drive control chip. There are fewer peripheral devices and the solution cost is low.
· Wide voltage 85Vac~265Vac input · Constant current accuracy ± 5%
· Supports no-input electrolytic capacitor solution · Supports PF value greater than 0.9 · Constant current control patent technology · Supports non-isolated low-cost BUCK drive scheme · Inductor current critical conduction mode · Three-stage dimming function · 0.5-3 seconds switch Switching · Built-in self-recovery output open, short circuit protection, over temperature protection function 80V-240mA program DEMO as shown below:
.jpg)
Figure 3: Three-stage 80V/240mA dimming solution implemented by the SM7390
2.2 Isolated Segmented Dimming Solution The SM7590 series SM7590 is a single-stage, high-precision, high-efficiency primary-side feedback LED constant current drive control chip with source high power factor correction and three-stage dimming. There are fewer peripheral devices and the solution cost is low. Applicable to the full range of input voltage from 85Vac to 265Vac, the constant current accuracy is within ±5%, and the PF value is greater than 0.9.
The SM7590 has the same function as the SM7390. The main difference is that the SM7590 is isolated and used in isolated panel lights and downlights. The typical circuit diagram is as follows:
Figure 4: Schematic of the SM7590 circuit
Typical electrical parameters are as follows:
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Summary <br> <br> Ming Microelectronics provides the above two types of segments dimming scheme, advantages and disadvantages. Linear constant current scheme (SM2212/3E): Simple solution, easy to batch and integrate, but only for single voltage input range, ie country with stable grid; switching power supply scheme: isolation (SM7590/2) and non-isolated (SM7390/2) Two-structured circuit that is compatible with the original isolation (SM7530/2) and non-isolated (SM7350/2) single-stage PFC solutions, without changing the board wiring, easy to replace, and low cost; At the same time, the internal sealing MOS can be used for low power, which further improves the cost performance. (This article is a microelectronics submission)
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