Several Common Contactless Voltage Regulators In China

Common contactless AC voltage stabilizers in China are the following:

① Ferromagnetic resonance AC voltage stabilizer: an AC voltage stabilizer made by combining a saturated choke with a corresponding capacitor and having a constant voltage volt-ampere characteristic. The magnetic saturation type is an early typical structure of this type of voltage stabilizer. It has a simple structure, is easy to manufacture, allows a wide range of input voltage changes, works reliably, and has a strong overload capacity. However, the waveform distortion is large and the stability is not high. The voltage stabilizing transformer developed in recent years is also a power supply device that uses the nonlinearity of electromagnetic components to achieve voltage stabilization. The difference between it and the magnetic saturation voltage stabilizer lies in the difference in the magnetic circuit structure, but the basic working principle is the same. It realizes the dual functions of voltage stabilization and voltage transformation on one iron core, so it is superior to ordinary power transformers and magnetic saturation voltage stabilizers.

② Magnetic amplifier AC voltage stabilizer: a device that connects a magnetic amplifier and an autotransformer in series and uses an electronic circuit to change the impedance of the magnetic amplifier to stabilize the output voltage. Its circuit form can be linear amplification or pulse width modulation. This type of voltage stabilizer 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 long. And because of the use of autocoupling, the anti-interference ability is poor.

③ Inductive AC voltage stabilizer: A device that stabilizes the output AC voltage by changing the phase difference between the secondary voltage of the transformer and the primary voltage. It is similar to a winding asynchronous motor in structure, and similar to an induction voltage regulator in principle. It has a wide voltage regulation range, good output voltage waveform, and can reach hundreds of kilowatts of power. However, since the rotor is often in a stalled state, the power consumption is large and the efficiency is low. In addition, due to the large amount of copper and iron materials, it is less produced.

④Static Voltage Stabilizer: AC voltage stabilizer using thyristors as power adjustment elements. It has the advantages of high stability, fast response, and no noise. However, it damages the AC waveform and interferes with communication equipment and electronic equipment.

⑤ Frequency-stabilized and voltage-stabilized power supply: The frequency-stabilized and voltage-stabilized power supply is an advanced technology introduced from Germany. It is mainly designed and developed for some remote areas or domestic and foreign power grids with large voltage and frequency fluctuation ranges, unstable power supply frequency, serious voltage distortion, or comprehensive voltage quality problems such as flicker and drop. The power supply can stabilize the frequency and voltage of the harsh power grid, and output high-quality source voltage and frequency according to customer requirements, avoiding the harm to the load equipment due to the large fluctuation range of voltage and frequency and the large fluctuation range of waveform distortion. The frequency-stabilized and voltage-stabilized power supply adopts IGBT/PWM mode, with small size and low noise. It adopts digital frequency division, phase locking, and waveform instantaneous feedback technology, which is stable and accurate. It adopts high-density digital waveform synthesis with low distortion rate and good waveform.