AC regulated power supply classification and characteristics

Update date:2018-05-27 Source:MAXGE

AC regulated power supply classification and characteristics

Parameter adjustment (resonance) type

This type of regulated power supply, the basic principle of voltage regulation is the LC series resonance, early appearance of magnetic saturation regulator belongs to this category. Its advantages are simple structure, no many components, high reliability and stability The range is quite wide, and the anti-interference and anti-overload capability are strong. The disadvantages are large energy consumption, large noise, heavy and high cost. The parameters regulator developed on the basis of the magnetic saturation principle and the "magnet amplifier-adjustable electronic ac regulator" (ie, Model 614), which has become popular in China in the 1950s, are AC voltage regulators of this type.

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Auto-coupling ratio adjustment type

1) Mechanical regulator type, that is, the servo motor drives the carbon brush to move on the sliding surface of the winding of the autotransformer, and changes the ratio of Vo to Vi to achieve the adjustment and stabilization of the output voltage. This regulator can range from a few hundred watts to several kilowatts. It is characterized by simple structure, low cost, and low distortion of the output waveform; however, due to the electric spark generated by the sliding contact of the carbon brush, the brush is damaged and even burned out and fails; and the voltage adjustment speed is slow.

2) Change the tap type, make the auto-transformer a plurality of fixed taps, use the relay or thyristor (solid state relay) as the switch 10 pieces, and automatically change the tap position to achieve the output voltage stability.

The advantages of this type of regulator are its simple circuit, wide voltage regulation range (130V~280V), high efficiency (≥95%), and low price. The disadvantage is that the regulation accuracy is low (±8 to 10%) and the working life is short. It is suitable for the home to supply the air conditioner.

AC power supply

3) High-power compensation type, purification regulator (including precision regulator) It uses compensation to achieve the stability of the output voltage, easy to achieve computer control.

Its advantages are good anti-interference performance, high voltage regulation accuracy (≤±1%), fast response (40~60ms), simple circuit and reliable operation. The disadvantage is that there are low-frequency oscillations when a nonlinear load such as a computer or a program-controlled switch is used; the input-side current distortion is large and the source power factor is low; the output voltage has a phase shift with respect to the input voltage. Units with higher requirements for anti-interference function are suitable for use in the city. When the computer is powered, the regulator must use 2 to 3 times the total power of the computer. Because it has the advantages of stable voltage, anti-interference, fast response and appropriate price, it is widely used.

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Switching AC regulated power supply It is used in high-frequency pulse width modulation technology. The difference from the general switching power supply is that its output must be the same as the input side with the same frequency and the same phase of AC voltage. Its output voltage waveforms are quasi-square wave, ladder wave, sine wave, etc. The uninterrupted power supply (UPS) on the market draws out the storage power and the charger, which is the voltage regulator of a switching AC power supply. Good performance, strong control functions, easy to implement intelligence, it is a very promising AC power supply. However, because of its complicated circuit and high price, promotion is slow.

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