AC regulated power supply uses can be broadly classified into the following five categories.
(1) ferromagnetic resonant AC voltage regulator: the use of saturated choke and the corresponding combination of capacitors with constant voltage volt-ampere characteristics and made of AC voltage regulator. Magnetic saturation type is the early typical structure of this regulator. It is a simple structure, easy to manufacture, the input voltage allows a wide range of changes, reliable, strong overload capacity. But the waveform distortion is large, stability is not high. In recent years, the development of voltage regulator transformer, also with the help of non-linear electromagnetic components to achieve the function of voltage regulator power supply device. It is different from the magnetic saturation regulator is the form of the magnetic circuit structure, and the basic working principle is the same. It is in a core at the same time to achieve voltage regulation and voltage double function, so it is better than ordinary power transformers and magnetic saturation regulator.
Magnetic amplifier type AC voltage regulator: the magnetic amplifier and autotransformer are connected in series, and the electronic circuit is used to change the impedance of the magnetic amplifier to stabilise the output voltage. Its circuit form can be linear amplification, can also be pulse width modulation, etc.. This type of regulator with feedback control of the closed-loop system, so the stability is high, the output waveform is good. However, due to the use of magnetic amplifiers with large inertia, so the recovery time is longer. And because of the use of autocoupling, so the anti-interference ability is poor.
③ sliding AC voltage regulator: change the position of the sliding contact of the transformer, so that the output voltage to obtain a stable device, that is, driven by a servo motor automatic voltage regulator AC regulator. These regulators have high efficiency, good output voltage waveform, no special requirements on the nature of the load. But the stability is lower, longer recovery time.
Induction AC voltage regulator: by changing the phase difference between the secondary voltage of the transformer and the primary voltage, the output AC voltage is stabilised. It is similar to the wire-wound asynchronous motor in structure, and the principle is similar to the induction regulator. Its voltage stabilisation range is wide, the output voltage waveform is good, and the power can be hundreds of kilowatts. But because the rotor is often in a blocked state, so the power consumption is large, low efficiency. Another copper, iron materials, so less production.
⑤ Thyristor AC voltage regulator: AC voltage regulator with thyristor as power adjustment element. It has the advantages of high stability, fast response, no noise. But because of the utility waveform damage to communications equipment and electronic equipment to cause interference.
