Suitable for energy efficiency of application LED street light 28 V, 3.3 A LED drive design

Suitable for energy efficiency of application LED street light 28 V, 3.3 A LED drive design

As the performance and cost LED almost all aspects of the continuous improvement, LED lighting is used in more and more wide application field, which is LED street light industry attention a focal point. Ansion beauty as used in semiconductor electronic products of high energy efficiency first silicon solution provider for all kinds of LED lighting applications, provide abundant drives, stabilizer/firm, and communications, the flow of light sensors, MOSFET, rectifier, protection, filter and thermal management products and complete solutions. This paper will introduce A for the LED street light applications such as 28 V, 3.3 A high power factor and LED drive design. This design based on the beauty of the NCL30001 A ONELED drive and NCS1002 constant pressure constant flow controller, the 90 to 265 V ac voltage power supply, to offer the most 90 W output power, has the high power factor, in conformity with relevant standards, and the harmonic content can match with pulse width modulation (PWM) light.

Single period of topology structure LED drive + subprime end CVCC controller combination

NCL30001 is a single period of topological structure of driving scheme, the flexible LED the characteristics is very suitable for application in new LED lighting products. This type of the single section integrated power factor correction (PFC) and isolate type step-down communication-direct current (DC) power conversion AC-offline type LED drive out the special section, can reduce the boost PFC components number, reduce the cost, improve the scheme with LED power system for energy efficiency and always LED street light, low dome light, wall lamp and building lighting applications.

NCL30001 USES continuous conductive mode (CCM) work, this scheme the integration and isolation type DC-PFC transform circuit, and provide DC constant current to direct drive LED. It will be equivalent to AC-DC transformation and LED drive two parts circuit together, are located in lighting lamps and lanterns and tell the article LED light in the integrated linear or DC-DC converter. The integral solution power conversion period of less, reduce use quantity components (such as optical components, LED, electronic components and printed circuit board), decrease the cost, and the system supports higher overall efficiency LED power supply. Of course, this scheme to higher power density, may is not suitable for all area lighting applications, the optical design may be more suitable for low power LED, typical applications include LED street lights, wall lamp, wall lamp and the wash refrigerator lighting.

NCL30001 controller of other specifications features include high pressure start-up circuit, voltage feedforward to improve loop response, input voltage detection, internal overload timer, latch-up input, and the harmonic precision less input lines by skulls. A ONELED also provide this type of device isolated single period of power factor correction LED drive evaluation boards, used for direct constant current output of 40 W to 100 W power range of applications. Current can be in 0.7 A and 1.5 A regulation, with between more wide range of high-power high brightness LED.

NCS1002 is a subprime end constant pressure constant current (CVCC) controller, suitable for LED lighting applications, such as street area with more NCL30001 controller can design high efficacy, has the function of light LED drive demo board.

Based on NCL30001 and NCS1002 90 W demo board

In order to help engineer the implementation lighting design as soon as possible, ansion beauty also provides A ONELED 90 W constant pressure constant current demo board, it can accept 90 to 265 Vac extension of the input voltage (general conditions that can be replaced components support 305 Vac), provide A 0.7 to 1.5 of A constant current output and 30 V to 55 V output voltage range (constant by resistance bleeder to choose), maximum output power 90 W, support 50 to 1000 Hz ac adjustable light control, and can be connected to XuanDiao can contain light of 6 pins interface card, used for simulation to adjust current/double brightness level digital light and other smart light applications. In addition, of this demo board also provide short circuit protection and opens protection, thermal protection, over-current protection and over-voltage protection etc. Rich protection properties The test shows that this demo board in 50 W output power, 1000 mA output voltage / 48 V positive pressure drop of 87% higher, energy efficiency, the conditions in the 50% to 100% load conditions power factor, and comply with more than 0.9 IEC61000-3-2 C equipment harmonic content standards.


Figure 1: demo board top view

Because of this design can have a standard NCL30001 evaluation boards (50 V2A) comparable power level, the change of the circuit principle is the design of transformer, and based on the NCS1002 constant current/constant voltage subprime side control circuit. Figure 2 shows is the primary side circuit. The design of the flyback transformer design from the original of the secondary windings, can satisfy a new high voltage and current requirements. Primary winding inductors and overall structure for basically the same. 277 VAC input can use proper rated voltage to change the EMI filter input "X" and "Y" capacitors.


Figure 2: NCL30001 CVCC 90 W demo board primary side principle diagram

Use NCL30001 continuous conduction mode power factor correction for single flyback type controller can realize the elevated, tunnel, parking lot and road lighting of regional lighting applications of constant current LED drive. The special design is for more than 3 A need to drive ability of LED and optimization, such as Luminus Devices of the company CSM360 and SST90. This design can support as many as eight SST90 series or two CSM360 devices. CSM360 LED in the drive current conditions for 3.2 A nominal positive voltage of 12.8 V, it depends on the color mild flux can produce 1600-3900 lumens.

Subprime side control circuit as shown in figure 3 below. In this design, the output voltage is determined by a resistivity, output current is also based on a resistivity of the set. Therefore, only two resistance need to change: one is the output voltage divider R34, the other is a part of the current set of R32 circuit. In addition, the output voltage is low and output current is higher, increased output capacitance, at the same time, reduce the rated voltage of capacitor.


Figure 3: subprime side principle diagram

Use of this circuit can achieve has the PWM light input and can XuanDiao light card Vout LED drive 30 CVCC subprime detection.

summary

Highly energy-efficient lighting is becoming a focus of the race for the industry. This article introduced the LED street lights in A ONELED applications 90 W LED drive design, the design with high power factor, accord with IEC61000-3-2 C equipment harmonic content standards, and can cooperate with PWM dimmer. Customers using ansion beauty of A ONELED products and reference design, energy efficiency up to speed up product listed process.

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