Electromagnetic Compatibility Requirements and Test Methods for AC Stabilized Power Supply
①, AC/DC power supply This type of power supply is also called primary power supply. It obtains energy from the grid, and obtains a DC high voltage through high-voltage rectification and filtering, which is used by the DC/DC converter to obtain one or several stable DC voltages at the output end. The power is from There are products from several watts to several kilowatts, which are used in different occasions. There are many specifications and models of this type of product, and the primary power supply in the communication power supply (AC220 input, DC48V or 24V output) also belongs to this category according to the needs of users.
②. DC/DC power supply is also called secondary power supply in the communication system. It is a DC input voltage provided by a primary power supply or a DC battery pack, and one or several DC voltages are obtained at the output terminal after DC/DC conversion.
③. Communication power supply The communication power supply is essentially a DC/DC converter power supply, but it generally supplies power with DC-48V or -24V, and uses a backup battery as a backup for DC power supply to convert the DC power supply voltage into the working voltage of the circuit. Generally, it is divided into three types: central power supply, layered power supply and single-board power supply, and the latter has the highest reliability.
④, radio power supply The radio power input AC220V/110V, the output DC13.8V, the power is determined by the power of the supplied station, and there are products with several amps and hundreds of amps. In order to prevent the AC power grid from affecting the work of the radio station, a battery pack is required as a Backup, so in addition to outputting a 13.8V DC voltage, this type of power supply also has the function of automatically converting the battery charge.
⑤. Module power supply With the rapid development of science and technology, the requirements for power supply reliability and capacity/volume ratio are getting higher and higher, and the module power supply is showing its superiority more and more. It has high operating frequency, small size, high reliability, and is easy to install And combined expansion, so it is more and more widely used. At present, although there is corresponding module production in China, the failure rate is relatively high because the production process has not caught up with the international level. Although the cost of DC/DC module power supply is relatively high at present, from the perspective of the overall cost of the long application cycle of the product, especially the high maintenance cost and loss of goodwill caused by system failure, it is still cost-effective to choose this power module Cost-effective, it is also worth mentioning here is the Rogowski converter circuit, its outstanding advantages are simple circuit structure, high efficiency and output voltage, current ripple value close to zero.
⑥. Special power supply High-voltage low-current power supply, high-current power supply, 400Hz input AC/DC power supply, etc., can be classified into this category, and can be selected according to special needs. The price of switching power supply is generally 2-8 yuan/watt, and the price of special low-power and high-power power supply is slightly higher, up to 11-13 yuan/watt.
