There are many kinds of regulated power supplies. Its function is to filter the mains. It is stabilized into various electrical appliances and circuits. The required voltage is called a regulated power supply.
A regulated power supply is defined as an electronic device that provides a stable AC or DC power supply to the load. Including AC regulated power supply and DC regulated power supply two categories.
AC regulated power supplyThe AC regulated power supply is also called an AC voltage regulator. With the development of electronic technology, especially after the application of electronic computer technology to various industries and scientific research fields, various electronic devices require stable AC power supply, and direct power supply to the power grid cannot meet the needs. The emergence of AC stabilized power supply has solved this problem. A problem.
Commonly used AC regulated power supplies are:
1 Ferromagnetic resonant AC voltage regulator. It consists of a saturated choke and a corresponding capacitor with constant voltage volt-ampere characteristics.
2 magnetic amplifier type AC voltage regulator. The magnetic amplifier and the autotransformer are connected in series, and the impedance of the magnetic amplifier is changed by an electronic circuit to stabilize the output voltage.
3 sliding AC voltage regulator. Stabilize the output voltage by changing the position of the sliding contact of the transformer.
4 inductive AC voltage regulator. The output AC voltage is stabilized by changing the phase difference between the transformer and the primary voltage.
5 thyristor AC voltage regulator. A thyristor is used as the power adjustment component. High stability, fast response and no noise. However, it causes interference to communication equipment and electronic equipment.
After the 1980s, there were three new types of AC regulated power supplies: compensating AC voltage regulators. Numerically controlled and stepped AC voltage regulators. Purified AC voltage regulator. It has good isolation to eliminate spikes from the grid.
DC regulated power supply is also called DC voltage regulator. Its supply voltage is mostly AC voltage. When the voltage of the AC supply voltage or the output load resistance changes, the direct output voltage of the regulator can be kept stable. The parameters of the regulator are voltage stability, ripple factor and response speed. The former represents the effect of changes in the input voltage on the output voltage.
The ripple factor indicates the amount of AC component in the output voltage under rated operating conditions; the latter indicates the time it takes for the voltage to return to normal when the input voltage or load changes drastically. The DC stabilized power supply is divided into two types: continuous conduction type and switch type.
The former is converted into a suitable value by a power frequency transformer to a single-phase or three-phase AC voltage, and then rectified and filtered to obtain an unstable DC power supply, and then a stabilized voltage (or current) is obtained through the voltage stabilization circuit. The power line is simple, the ripple is small, and the mutual interference is small, but the volume is large, the consumables are large, and the efficiency is low (usually lower than 40% to 60%).
The latter regulates the output voltage by changing the on-off time ratio of the adjustment component (or switch) to achieve regulation. This kind of power supply has low power consumption and the efficiency can reach about 85%, but the disadvantage is that the ripple is large and the mutual interference is large. Therefore, it has developed rapidly since the 1980s. From the way of working can be divided into:
1 controllable rectifier type. Adjust the output voltage by changing the on-time of the thyristor.
2 æ–© wave type. The input is an unstable DC voltage, which is changed by the on-off ratio of the switching circuit to obtain a unidirectional pulsating DC, and then filtered to obtain a stable DC voltage.
3 converter type. The unstable DC voltage is first converted into high-frequency alternating current by the inverter, and after being transformed, rectified and filtered, the new DC output voltage is sampled, and the operating frequency of the inverter is feedback-controlled to achieve the purpose of stabilizing the output DC voltage.
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