Yangzhou Kaihong Power Technology Co., Ltd. (Yangzhou Headquarters)
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An electronic device capable of providing stable AC power to a load. Also known as AC voltage regulator. For the parameters and quality indicators of AC stabilized power supplies, see DC stabilized power supplies. Various electronic devices require relatively stable AC power supply, especially after computer technology is applied to various fields, using the direct power supply from the AC grid without taking any measures can no longer meet the needs.
AC stabilized power supplies are widely used and have many types, which can be roughly divided into the following types.
Contactless AC voltage regulator
①Ferromagnetic resonance AC voltage stabilizer: an AC voltage stabilizer made by using a saturation choke and a corresponding capacitor with constant voltage volt-ampere characteristics. Magnetic saturation type is an early typical structure of this regulator. It has a simple structure, convenient manufacturing, wide input voltage allowable range, reliable operation, and strong overload capacity. However, the waveform distortion is large and the stability is not high. The voltage stabilizer developed in recent years is also a power supply device that realizes the voltage stabilization function by virtue of the nonlinearity of electromagnetic components. It differs from magnetic saturation regulators in that the magnetic circuit structure is different, and the basic working principle is the same. It realizes the dual functions of voltage regulation and voltage transformation on one iron core, so it is superior to ordinary power transformers and magnetic saturation regulators.
② Magnetic amplifier type AC voltage stabilizer: A device that connects a magnetic amplifier and an autotransformer in series and uses electronic circuits to change the impedance of the magnetic amplifier to stabilize the output voltage. The circuit form can be linear amplification or pulse width modulation. This type of regulator has a closed-loop system with feedback control, so it has high stability and good output waveform. However, due to the use of a magnetic amplifier with large inertia, the recovery time is longer. Due to the use of self-coupling, the anti-interference ability is poor.
③ Inductive AC voltage stabilizer: A device that changes the phase difference between the secondary voltage of the transformer and the primary voltage to obtain a stable output AC voltage. It is similar in structure to a wound asynchronous motor, but similar in principle to an inductive voltage regulator. It has a wide voltage regulation range, good output voltage waveform, and power can reach hundreds of kilowatts. However, because the rotor is often in a locked state, power consumption is large and efficiency is low. In addition, due to the large amount of copper and iron materials, less production.
④ Thyristor AC regulator: AC regulator using thyristor as power adjustment element. It has the advantages of high stability, fast response and no noise. However, it will cause interference to communication equipment and electronic equipment due to damage to the mains waveform.
Contact AC voltage regulator
Sliding AC voltage regulator: A device that changes the sliding contact position of the transformer to obtain stable output voltage, that is, an automatic voltage-regulating AC voltage regulator driven by a servo motor. This type of regulator has high efficiency, good output voltage waveform, and no special requirements on the nature of the load. But the stability is lower and the recovery time is longer.
With the development of power supply technology, the following three new AC stabilized power supplies appeared in the 1980s. ①Compensating AC voltage regulator: also known as partially adjusted voltage regulator. The additional voltage of the compensation transformer is connected in series between the power supply and the load. As the input voltage is high or low, use an intermittent AC switch (contactor or thyristor) or a continuous servo motor to change the size or pole of the additional voltage. Performance, the input voltage is higher (or insufficient) minus (or add), so as to achieve the purpose of voltage regulation. The capacity of the compensation transformer is only about 1/7 of the output power. It has the advantages of simple structure and low cost, but the stability is not high. ②NC-type AC voltage regulator and step-type voltage regulator: control circuit is composed of logic elements or microprocessors, and the primary turns of the transformer are converted according to the input voltage level to stabilize the output voltage. ③Static AC voltage stabilizer: Because it has a good isolation function, it can eliminate the spike interference from the power grid and be used. Electric bodyguard regulator
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