Compared with ordinary power electronic devices, lighting applications require that the rate of change of device parameters with temperature be as small as possible. At present, domestic power device manufacturers are moving towards high-end product lines, trying to change the market of high-end power electronic devices in China. pattern. Wang Dewen, deputy chief engineer and director of the technical center of Shenzhen Shenai Semiconductor Co., Ltd.
According to statistics, lighting electricity accounts for about 20% of the total electricity consumption in the world. Therefore, the use of green lighting products to reduce the power consumption in the lighting field is of great significance to the energy conservation and emission reduction of the whole society.
Lighting applications emphasize device temperature characteristics
The green lighting products that are widely used in life include compact energy-saving lamps (CFL), electronic ballasts (Ballast) and quartz lamp electronic transformers. For these three products, power electronics are core devices. According to different solutions, power electronics plays a decisive role in the operating frequency, performance and service life of the entire lighting fixture. At the same time, in terms of cost, power electronic devices also occupy a considerable proportion of the overall cost. For example, in a compact energy-saving lamp, two energy-saving lamps use two electronic power devices, which is second only to the lamp in cost. s component.
Green lighting fixtures have a wide geographical range and different installation conditions, and their application environments vary greatly. For example, the winter in northeastern China or northern Europe is very cold, the indoor temperature can reach -15 ° C to -20 ° C (outdoor temperature is too low, generally not recommended); in the hot summer, room temperature can reach 40 ° C; in the airtight In the lamp holder, the power of the power device as a switch control can reach 140 °C. From the perspective of its load, the lamp tube and the bulb are gas discharge lamps, which have different characteristics from capacitive and inductive loads, and require higher voltage and larger current in the initial stage of starting; from the perspective of working characteristics, power electronic devices are mainly used as electronic switch. Therefore, in the field of lighting applications, in addition to requiring good current characteristics and high breakdown voltage, it also requires good switch parameter consistency, and also has special requirements for temperature characteristics, requiring the parameter to change as much as possible with temperature. Of course, as a non-durable consumer product, devices for green lighting also require low cost and high cost performance.
Domestic devices occupy the low-end market
At present, the power electronic devices in the field of green lighting mainly include three application solutions such as BJT (bipolar transistor), MOSFET (metal oxide semiconductor field effect transistor) and integrated IC (integrated circuit), and IGBT (insulated gate bipolar) Type transistors) are used less in the lighting field due to cost issues. Among them, bipolar transistors are the main products of domestic semiconductor manufacturers, occupying a major market share. MOSFETs have occupied a major market share by foreign companies. Domestic manufacturers are in the development stage and have not yet become mainstream suppliers, while integrated ICs Mainly to foreign manufacturers.
For bipolar transistors, domestic manufacturers mainly use triple-diffusion solutions, mainly for 4-inch and 5-inch production lines, while foreign manufacturers have triple-diffusion and multi-layer extensions, mainly for 5-inch or 6-inch production lines. In terms of MOSFET production, the production process technology is still developing rapidly. Each manufacturer has its own technical characteristics. Among them, Infineon's CoolMOS technology has its own characteristics and has certain advantages in on-resistance. Compared with chip manufacturing, the core technology in the field of packaging and testing has a small gap between domestic manufacturers and foreign manufacturers, which is basically close to the world advanced level. At the same time, international manufacturers have also set up factories in China. In the field of lighting, chip design technology and process level continue to increase, due to the reduction in size and cost reduction, the product is gradually developing into miniaturization and surface mount. The initial package form is mostly in-line TO-92/126/251/220, and now the TO-92 tape product and the TO-252 (IPAK) and TO-263 (D2PAK) products of the automatic plug-in have already occupied a certain proportion.
Relatively speaking, the domestic chip production line has a certain cost advantage due to the long equipment age, the advantage in equipment depreciation, and the low labor cost.
After years of development, domestic products have benefited from the improvement of technology and the progress of materials, and the performance of products has improved rapidly. At present, domestic power electronic devices have completely replaced imported products in middle and low-end products.
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