Classification and characteristics of DC regulated power supply
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 supplies in detail below.
chemical power
The dry batteries, lead-acid batteries, nickel-cadmium, nickel-metal hydride, and lithium-ion batteries we usually use are all chemical power sources, each with its own advantages and disadvantages. With the development of science and technology, intelligent batteries have been produced; in terms of rechargeable battery materials, American researchers have discovered a kind of iodide of manganese, which can be used to manufacture cheap, compact, long-discharge time, and still maintain battery life after multiple charges. Environmentally friendly rechargeable battery with good performance.
Linear DC Power Supply (LPS)
Linear DC regulated power supply refers to the DC regulated power supply in which the regulating tube works in a linear state. Linear DC regulated power supply mainly includes power frequency transformer, output rectification filter, control circuit, protection circuit and so on.
The linear DC regulated power supply is to transform the AC power through a transformer first, and then rectify and filter it through a rectifier circuit to obtain an unsteady DC voltage. To achieve a high-precision DC voltage, the output voltage must be adjusted through voltage feedback, which can achieve a high degree of stability. , the ripple is also very small, and there is no interference and noise that switching regulated power supplies have. However, its disadvantage is that it requires a huge and heavy transformer, and the volume and weight of the required filter capacitor are also quite large, and the voltage feedback circuit is working in a linear state, and there is a certain voltage drop on the adjustment tube, and the output is relatively large. At this time, the power consumption of the adjustment tube is too large, the conversion efficiency is low, and a large heat sink must be installed.
Switching DC Stabilized Power Supply
Switching DC regulated power supply is a power supply that uses modern power electronics technology to control the time ratio of switching transistors on and off to maintain a stable output voltage. Its circuit forms mainly include single-ended flyback, single-ended forward, half-bridge, push-pull and full-bridge. The basic switch-type DC regulated power supply mainly includes input grid filter, input rectification filter, inverter, output rectification filter, control circuit, and protection circuit.
The advantages of switching DC regulated power supply are small size, light weight, stable and reliable. Disadvantage Compared with the linear DC regulated power supply, the ripple is larger (generally ≤ 1%V P-P ). The following categories introduce several
Switching DC regulated power supply:
AC/DC power supply This type of power supply is also called primary power supply. It obtains energy from the power 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 ranges from several watts ~ There are products of several kilowatts, which are used in different occasions.
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.
Communication power supply 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 DC power supply backup to convert the DC supply voltage into a circuit operating voltage. Generally, it is divided into three types: central power supply, layered power supply and single-board power supply. The reliability of single-board power supply is the highest.
Radio power The radio power input AC220V/110V, output DC13.8V, the power depends on the power of the station. In order to prevent the radio station from being affected by the power failure of the AC grid, a battery pack is required as a backup, so this type of power supply not only outputs a 13.8V DC voltage, but also has an automatic conversion function for battery charging.
With the rapid development of science and technology, the modular power supply has higher and higher requirements for power supply reliability, capacity, and volume ratio. The modular power supply is showing its superiority more and more. It has high operating frequency, small size, high reliability, and is easy to install and combine. Expansion, so it is more and more widely used.
