When choosing the open frame power supply, engineers often need to make a comprehensive comparison on the cost, packaging and power supply of the bare board power supply. The bare board power supply products provided by manufacturers often provide customers with several different products for easy selection, such as commodity grade, industrial level, etc., which is a more common differentiation mode. Due to the different temperature level of bare board power supply, different production materials and manufacturing processes, the price gap is very large, once the improper selection will also affect the use. Therefore, it is very important to master the temperature range.
In order to ensure the efficiency, a more convenient and effective selection method is to start from the temperature range, combined with the comprehensive comparison of power, which can help engineers quickly find a more suitable power mode. Let's take a look at the details of this approach.
First of all, we need to ensure that the temperature range not only meets the needs of actual work, but also has a little margin. Different product models have different requirements for temperature range. When selecting the temperature range, engineers need to consider the upper limit of the maximum temperature and the minimum temperature to avoid the instability of the system performance when the temperature rises or falls.
In the first case, if an engineer chooses a product with a smaller temperature range due to the cost control problem, he needs to choose a product with a larger power or package, which can slightly reduce the temperature rise and alleviate the contradiction to a certain extent. In general, the proportion of body loss varies with the power level. In general, the forehead droop value above 50 W is 3-10 w / ℃, and the engineer can calculate the forehead droop value through this value. If the product temperature range is very wide, the use of bare board power supply is enough. In the packaging, the smaller one can be selected, but the cost is high; If we choose products with general temperature range, the price and cost are lower, and the power margin and packaging form must be larger. In both cases, the engineer needs to compromise with the temperature range.
