Classification and characteristics of DC regulated power supply:
According to custom, DC regulated power supplies can be divided into chemical power supplies, linear regulated power supplies and switching-type regulated power supplies. Below we will introduce these types of power supplies in detail.
1. Chemical DC regulated power supply:
The dry batteries, lead-acid batteries, nickel-cadmium, nickel-hydrogen, 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, smart batteries have emerged. In terms of rechargeable battery materials, American researchers have discovered an iodide of manganese, which can be used to make batteries that are cheap, compact, have a long discharge time, and remain stable after multiple charges. Environmentally friendly rechargeable battery with good performance.
2. Linear DC regulated power supply:
Linear DC regulated power supply refers to a 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 rectifier filter, control circuit, protection circuit, etc. The linear DC regulated power supply first transforms the AC power through a transformer, and then rectifies and filters the 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 high stability. , the ripples are also very small, and there is no interference and noise that the switching regulated power supply has.
However, its disadvantage is that it requires a large and heavy transformer, and the required filter capacitor is also quite large in size and weight. Moreover, the voltage feedback circuit works in a linear state, and there is a certain voltage drop on the adjustment tube. When the large operating current is output, 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.
3. Switching DC regulated power supply:
The switching DC regulated power supply is a power supply that uses modern power electronics technology to control the turn-on and turn-off time ratio of the switching transistor 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 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. The disadvantage is that the ripple of the linear DC regulated power supply is larger (generally ≤1%VP-P).
