Several types of switching power supplies are generally customarily categorized:
AC/DC power supply
This type of power supply, also known as primary power supply, which obtains energy from the grid, after high-voltage rectification and filtering to get a DC high-voltage for DC/DC converter at the output side to obtain a stable DC voltage or several power from a few watts - a few kilowatts of products, for different occasions. There are many specifications and models of such products, and the primary power supply (AC220 input, DC48V or 24V output) in the communication power supply according to the user's needs is also of this type.
② DC/DC power supply
In the communication system, also known as the secondary power supply, it is the primary power supply or DC battery pack to provide a DC input voltage, after the DC/DC conversion at 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 the three kinds, the latter is the most reliable.
④ Radio power supply
Radio power input AC220V/110V, output DC13.8V, power by the power of the radio station, a few amps several hundred amps are available. In order to prevent the AC grid power failure affects the work of the radio, and 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 is increasingly high, the module power supply shows its superiority more and more, it is a high operating frequency, small size, high reliability, easy to install and combination of expansion, so it is more and more widely used. At present, although 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 product's long application cycle of the overall cost, 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 of close to zero. The outstanding advantages are simple circuit structure, high efficiency and near-zero ripple value of output voltage and current.
⑥ Specialty Power Supplies
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.
