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How to choose the right AC-DC power module?
Release time:
2022-09-05 11:09
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AC-DCPower supply moduleIs the exchange-DCconversion module, whereACIt means to communicate,DCIt means direct current. In theory, when selecting a module, the higher the power, the better to ensure the higher requirements of the system. But the greater the power, the larger the volume and the higher the cost. Therefore, when selecting a power module, the operating power of the product is best maintained at the power of the power module used.30-80%, Because in this power range, the performance of the module power supply is stable and reliable, which is more conducive to the long-term operation of the module.
Select the overpoweredAC-DCPower supply moduleProducts will lead to waste. If the power is just right or too small, it will easily lead to overload. In light cases, the system will be unstable, and in heavy cases, the components will be burned out. Although some power module products can be overloaded at present, they can only be used in emergency and are not recommended for long-term use. Of course, this depends on different products and different requirements. You can choose the right power module according to your product characteristics and needs.
AC-DCPower supply moduleSome commonly used products are in line with international standards, and many are non-standard products. And the same company's products, the same power, there will be different packaging forms; on the contrary, the same package will have different power, we can choose a reasonable package according to their own product needs. Three general considerations:
1Under the premise of determining the power, the package size is as small as possible to meet the heat dissipation requirements of the product, which is more conducive to the volume control of the product, and can also leave space for more important components. Of course, if the size is not very important, in order to make the product more weight, you can also choose a larger size to obtain a better heat dissipation effect.
2Try to choose international standard products. Because these products are relatively mature after extensive use and verification, thus reducing the risk of product development. And later, for some reason, it is easier to change other brands of the same standard products.
3It should be extensible to facilitate later expansion and upgrade. For example, the same package can be replaced with a more powerful one due to product upgrade in the later period, but the size and package remain unchanged, so that the product upgrade can be completed quickly. Therefore, it can be seen that the packaging form is also considered according to its own needs. Especially for some products with their own characteristics, manufacturers can be required to carry out independent development to meet the requirements of their own products, to a certain extent, they can prevent others from copying their own products and protect their own products. And then in the use of continuous improvement, so that the power products are getting better and better. Taking Sanmin's power module products as an example, the product series covers a variety of packaging forms such as international standards, non-standard, and customization. The product work is quite stable and can meet the different needs of users.
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2019-08-06
Product selection and application considerations
The design power of each product of our company will have a certain amount of redundant power, which can run for a long time under full load or even over the rated load. However, for the sake of high reliability and prolonging the service life of the power supply, please do not let the load reach the rated value. It is generally recommended to use 60%-80% of the rated load, and the ambient temperature is recommended to be about 30 ℃, which can be fully loaded at an ambient temperature of 55 ℃, but this will undoubtedly greatly reduce the reliability and service life of the product. In actual use, please pay attention to the two factors of controlling load and temperature. If the ambient temperature is relatively high, it is necessary to reduce the load as much as possible (that is, to increase the load margin and select products with greater output power). On the contrary, if a large load current is required, then try to do a good job of ventilation and heat dissipation, such as placing the power supply module in an open space and increasing cooling fans. The specific value is not absolutely fixed. Generally, it is recommended that the load should not exceed 20% of the rated load when the ambient temperature is 55 ℃, which can keep the product very high reliability. Tip: Please use temperature measuring equipment to evaluate the temperature, and do not rely on skin feeling. Short time and a small proportion of full load, high temperature operation, the reliability and life has little effect. For example: each full load lasts less than 1 minute or half a minute, and the interval is more than 10 minutes, while the load during the interval is less than 15% of the rated load, then even if the operation at 55 ℃ is also possible. Safe Use Warning: Since the bare board series does not have a shell, the input is 220V AC at the same time. The input pins and corresponding terminals of the module are directly connected to 220V. Please pay great attention to prevent short circuit between electric shock and metal objects and ensure that the power supply is disconnected before any touch. Load Requirements for 2. Use of Multiple Output Power Supplies Generally, the voltage accuracy of the output of the multi-output power supply is: the nominal value of the main output is plus or minus 1%, and the nominal value of the secondary output is plus or minus 5%-10%. The first output of the multi-output power supply is the main circuit, and the other output is the secondary circuit. The voltage accuracy and carrying capacity of the main circuit are higher than those of the secondary circuit. Therefore, the main circuit with large current and high voltage accuracy requirements should be generally selected, it is appropriate that the ratio of each current is 50-100%, and the secondary circuit must not be loaded separately under the condition of no load on the main circuit, otherwise the secondary circuit voltage is too low to be used normally. In addition, if the main circuit load is full load and the secondary circuit load is light load, the secondary circuit voltage may increase, otherwise the secondary circuit voltage will decrease, and the reliability and service life will have little effect. For example, if each full load lasts less than 1 minute or half a minute, and the interval is more than 10 minutes, while the load during the interval is less than 15% of the rated load, then even operation at 55°C is possible.
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Can switching power supply and module power supply be universal?
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