(Author: China Computer Newspaper, 2000 at 16:27 on November 17)
■ The power purchase guide is so how can I find a power supply for myself in such a chaotic market? 1. Appearance check: A. Power weight. A good power is generally more important. B. Power output line. Don't underestimate these output lines, because the power supply box output power is generally large, and a small point resistance will produce a larger pressure drop loss. Good quality power must be thick lines. 2. Material of the heat sink. From the housing fine seam, the quality of the power supply uses aluminum or copper heat sink, and larger, thicker. 3. You can measure the load pressure drop, and the pressure-reduced power supply is lowered. If it is an ATX power supply, you can leave all the outputs, first test the no-load output voltage, the method is to short the PS - ON to GND to start the power supply, then test the voltage of the output current is about 10A, the pressure drop Excellent. The above tests must not be made on 12V, -12V to avoid burnout power. 4. If the power ground line is not connected, the quality of the power supply is powered by the housing after the housing is slightly hidden. If the voltage does not detect, the internal stealing process is not installed. In addition, the fan is evenly uniform and smaller, and the sound will be slightly increased after the load is loaded. 5. Turn on the power box, you can find that the quality of the power supply materials is exquisite, such as multiple square CBB capacitors, the input filter capacitance value is greater than 470 microscopy, and the output filter capacitance value is also large. At the same time, internal inductors, capacitive filter network circuits, and have a complete overvoltage, limited flow defius. A qualified power supply should be certified by security and electromagnetic, such as meetings to CCEE and FCC-B, which should be embodied in the appearance of the power supply. ■ Mainstream power supply introduction The Great Wall ATX-250S power supply is 250W power supplied by Great Wall Company. Great Wall Company has passed ISO 9001 in the domestic power industry, ensuring the quality of the product from the system. The power supply complies with the latest International INTEL ATX 2.03 standard, and the first main passing through China Electric Products (CCEE) safety certification, through electromagnetic compatible national standard B and FCC - B. The power supply has multiple protection functions such as lightning protection design, double overvoltage, overcurrent, output short circuit, with low-corrugated, low noise, high efficiency (> 72%). Great Wall ATX-300SE Power This power is in line with the latest International INTEL ATX 2.03 standard. With a traditional silver gray housing, the whole gives people a feeling of generous and durable. The front side of the power supply has a hollowed heat hole, which can intuitively see the housing of this power supply is made of high-quality galvanized steel sheets, not only strong and durable, but also effectively shield electromagnetic radiation. In addition, from the front heat dissipation hole, it is possible to see that there are two very thick fish-shaped heat sinks in the casing, not only the heat dissipation effect, but also does not generate scrap and burning phenomena when pressurizing the power supply. The Great Wall ATX-300SE power is all certified by CCEE, and can support network switching, keyboard switching function. In the leakage test of the Great Wall 300SE, the test leakage current is less than 3.5 mA. In addition, the Great Wall power supply also is very excellent in output voltage stability and output voltage ripple. Parkson BS-2000 This power supply specification is a standard ATX 2.03 power supply, 5VSB 1.0A. It conforms to CCEE safety certification, electromagnetic conduction interference (EMI) meets the national standard GB9254-88 B-class (civil standard) standard, US FCC-B standard, EU CE standard. BS-2000 unique temperature control function design, temperature control circuit changes the temperature of the heat-dissipating fan speed according to the internal temperature of the computer and the power supply, so that the computer system achieves the best heat dissipation. At the same time, the power supply also has multiple protection functions such as lightning protection design, overvoltage, overcurrent, output short circuit. Its work voltage range is relatively wide, meets the requirements of domestic instable grid voltage fluctuations on the power supply. Using the environment is loose: the ambient temperature is 5 ° C ~ 45 ° C; the relative humidity is between 20% and 85%. Meet the work requirements of the power supply in K7 and PII CPUs and corresponding motherboards.
