LED lighting circuit and system level optimization analysis

LED lighting: the fastest one day to complete the basic circuit design

semiconductor manufacturers are also involved in LED lighting business. LED power supply circuit to drive IC, a lot of semiconductor manufacturers have introduced a diversity of products. In manufacturers compete on the drive IC driver under the situation of capacity and efficiency and achieve more functions, national semiconductor ( 美国国家半导体公司) Make products not only have these characteristics, but also reduce the difficulty of power supply circuit design.

use the company for the power supply circuit design tools such as the development of online 'WEBENCH', the shortest can be completed in one day include choose according to the LED drive mode, select the drive IC, circuit design and circuit simulation, the basic circuit design ( Figure 8 and figure 9) 。 Drive IC can only use the company's products, but the LED, capacitor and inductor will be selected from the major manufacturers of products. WEBENCH is free to use, if most equipment developers are using the tool to circuit design, will help countries drive IC for expanding application of semiconductor production.

figure 8: the design of LED lighting products easier

the picture says use of the development of national semiconductor design tools 'WEBENCH' LED lighting product design process. The shortest design and simulation can be done in a day. Represented by the LED components and drive mode choice, the choice of drive IC, as well as circuit design, are available online, electrical properties and thermal characteristics of simulation can be completed online.

, including lighting and the back light for nearly a year WEBENCH was applied in the case of LED power supply circuit has increased dramatically, achieve WEBENCH whole cases about 1/7 ~ 1/6. Many designers lack experience based on the power of the LED driver IC design, estimate the designers are using WEBENCH in design. For the inexperienced designers, from a lot of drive IC, LED, and find out the best parts in passive components, the practice of the optimal design of the circuit and then leads to heavy work load. Sometimes need a couple of weeks to design the basic circuit.

design LED lighting appliances, LED as the light source and optical components used to achieve the required radiation characteristics will be taken seriously. And power supply circuit design tend to be pushed, but 'often hear such as optical design is progressing, but because of the power circuit design and stumble example' ( National semiconductor Japan as a legal person) 。 This is the application of expanding WEBENCH has played a positive role.

figure 9: when using WEBENCH design picture

but in the same picture, display circuit diagram and electrical characteristics of the simulation results, and the selected components list, etc. Still can use the top left of the disc change circuit area and cost and characteristics of the priority of the project. After change the priority, will display the corresponding circuit composition, etc. Images provided by the national semiconductor.

WEBENCH in cost, efficiency and installation can be shown in the area of a priority for any condition, considering three projects at the same time the five kinds of balancing circuit. The user can choose the required circuit. In simulation, have in response to changes in the input power characteristics, dimming the action, action and stability of the startup state of circuit simulation. Users can change the components of optimizing circuit at the same time. Various simulation it can be finished in 5 minutes, the longest and will not bring impact to the design.