DC Regulated Power Supply Classification and Characteristics
DC regulated power supply can be divided into chemical power supply, linear regulated power supply and switching regulated power supply according to the habit, we will introduce these types of power supply specifically below.
Chemical power supply
We usually use dry batteries, lead-acid batteries, nickel-cadmium, nickel-metal hydride, lithium-ion batteries belong to the chemical power supply, each with its own advantages and disadvantages. With the development of science and technology, and produced intelligent batteries; in terms of rechargeable battery materials, the United States researchers found that manganese an iodide, with which you can create a cheap, compact, long discharge time, many times after charging still maintains the performance of a good environmentally friendly rechargeable batteries.
Linear DC Regulated Power Supply (LPS)
Linear DC regulated power supply refers to the regulator working in a linear state of DC regulated power supply. Linear DC regulated power supply mainly includes industrial frequency transformer, output rectifier filter, control circuit, protection circuit and so on.
Linear DC regulated power supply is the first AC power through the transformer voltage, and then through the rectifier circuit rectifier filter to get the unstable DC voltage, in order to achieve high precision DC voltage, must be adjusted through the voltage feedback output voltage, can achieve a very high degree of stability, the ripple is also very small, and there is no switching regulated power supply has the interference and noise. But its disadvantage is the need for a huge and bulky transformer, the volume and weight of the required filter capacitors is also quite large, and voltage feedback circuit is working in a linear state, there is a certain amount of voltage drop on the adjustment tube, in the output of a larger operating current, resulting in the adjustment of the tube is too large, low conversion efficiency, but also the installation of a large heat sink.
Switching DC regulated power supply
Switching DC regulated power supply is the use of modern power electronics technology, control the switching transistor turn on and off time ratio, to maintain a stable output voltage of a power supply. Its circuit form mainly has single-ended flyback, single-ended forward, half-bridge, push-pull and full-bridge. The basic switching DC regulated power supply mainly includes input grid filter, input rectifier filter, inverter, output rectifier filter, control circuit and protection circuit.
The advantages of switching DC regulated power supply are small size, light weight, stability and reliability. Disadvantages relative to the linear DC regulated power supply ripple is large (generally ≤ 1%V P-P). The following classification introduces several types of switching DC regulated power supplies:
AC/DC power supply
This type of power supply is also called primary power supply, which obtains energy from the power grid, and gets a DC high voltage after high-voltage rectification and filtering for DC/DC converter to obtain one or several stable DC voltages at the output end, and the power ranges from a few watts to a few kilowatts, which are used in different occasions.
DC/DC Power Supply
It is also called secondary power supply in communication system, it is a DC input voltage provided by primary power supply or DC battery pack, and one or several DC voltages are obtained at the output after DC/DC converter.
Communication power supply
Communication power supply is in essence a DC/DC converter type power supply, only that it is generally supplied with DC-48V or -24V, and the backup battery is used as a DC supply backup to transform the DC supply voltage into the circuit working voltage. Generally, it is divided into central power supply, layered power supply and single-board power supply, and the reliability of single-board power supply is * high.
Radio Power Supply
The power supply of the radio station inputs AC220V/110V and outputs DC13.8V, and the power is determined by the power of the supplied radio station. In order to prevent the AC network power failure to affect the radio work, and need 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.
Modular power supply
With the rapid development of science and technology, the reliability of the power supply, capacity, volume than the requirements of more and more high, modular power supply more and more to show its superiority, it is a high operating frequency, small size, high reliability, easy to install and combination of expansion, so more and more widely used.
Special Power Supplies
Current power supply, 400Hz input AC/DC power supply, etc. can be classified into this category and can be selected according to special needs.
