General customary classification of several types of switching power supplies
①, AC / DC power supply This type of power supply is also known as primary power supply, which obtains energy from the grid, after high-voltage rectifier filtering to get a DC high voltage for the DC / DC converter at the output to obtain a stable DC voltage or several, the power from a few watts - a few kilowatts of products for different occasions. The specifications of such products are numerous, according to user needs depending on the communication power supply in the primary power supply (AC220 input, DC48V or 24V output) also belongs to this category.
②, DC / DC power supply in the communication system is also known as the secondary power supply, it is the primary power supply or DC battery pack to provide a DC input voltage, DC / DC converter after the output side of one or more DC voltage.
③, communication power supply communication power supply is in essence a DC/DC converter type power supply, but it is generally DC-48V or -24V power supply, and use the backup battery as a backup for the DC power supply, the DC supply voltage converted into the circuit voltage, generally it is divided into the central power supply, layered power supply and single-board power supply of three kinds, the latter is the most reliable * high. Generally, there are three kinds of power supply: central power supply, layered power supply and single board power supply.
④, radio power supply radio power input AC220V/110V, output DC13.8V, power by the power of the radio station, a few amp hundreds of amp have products. In order to prevent the AC power grid power outage affects the work of the radio, and the need to have a battery pack as a backup, so this type of power supply in addition to the output of a 13.8V DC voltage, but also has a battery charging automatic conversion function.
⑤, modular power supply With the rapid development of science and technology, the reliability of the power supply, capacity / volume ratio requirements are increasingly high, the modular power supply is increasingly showing its superiority, it is a high operating frequency, small size, high reliability, easy to install and combined capacity expansion, so more and more widely used. At present, there are corresponding domestic module production, but because the production process failed to catch up with the international level, the failure rate is high. DC / DC module power supply is currently higher cost, but from the overall cost of the product's long application cycle, especially due to system failure and the resulting high cost of maintenance and loss of goodwill, the choice of the power supply module is still cost-effective and cost-effective, it is also worth mentioning that the Roche converter circuit, which has the outstanding advantages of a simple circuit structure, high efficiency and the output voltage, current ripple value is close to zero. The outstanding advantages are simple circuit structure, high efficiency and output voltage, current ripple value is close to zero.
(6), special power supply high-voltage small-current power supply, high-current power supply, 400Hz input AC / DC power supply, etc., can be categorized as such, according to the special needs of the selection. The price of switching power supply is generally in the 2-8 yuan / watt special small power and high power power supply prices are slightly higher, up to 11-13 yuan / watt.
