Core Tip: Power products are widely used in industrial automation control, military equipment, scientific research equipment, industrial equipment, computers and computers, communications equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating.
Here is a brief introduction to the classification of power products:
Classification and characteristics of AC regulated power supplies:
A power supply capable of providing a stable voltage and frequency is called an AC stabilized power supply. At present, the work done by most domestic manufacturers is that the AC voltage is stable. The following is a brief description of the classification characteristics of the AC power supply in the market.
Parameter adjustment (resonance) type
This kind of regulated power supply, the basic principle of voltage regulation is LC series resonance. The early appearance of magnetic saturation regulator belongs to this category. Its advantage is that the structure is simple, there are not many components, and the reliability is quite high. The range is quite wide, and the anti-interference and anti-overload capability is strong. The disadvantages are large energy consumption, high noise, heavy and high cost.
The parametric voltage regulator developed on the basis of the principle of magnetic saturation and the "magnetic amplifier-adjusted electronic AC voltage regulator" (ie type 614) that have been popular in China in the 1950s are all AC voltage regulators of this type.
Auto-coupling
1. Mechanical pressure regulation type, that is, the servo motor drives the carbon brush to move on the winding sliding surface of the autotransformer, and changes the ratio of Vo to Vi to achieve the adjustment and stability of the output voltage. The regulator can range from a few hundred watts to several kilowatts. The utility model has the advantages of simple structure, low cost and small distortion of the output waveform; however, since the sliding contact of the carbon brush is easy to generate electric spark, the brush is damaged or burned and fails; and the voltage adjustment speed is slow.
2. Change the tap type, make the autotransformer into multiple fixed taps, use relay or thyristor (solid state relay) as the switch 10, and automatically change the tap position to achieve stable output voltage.
The advantages of this type of regulator are simple circuit, wide voltage regulation range (130V-280V), high efficiency (≥95%), and low price. The disadvantage is that the voltage regulation accuracy is low (±8~10%) and the working life is short. It is suitable for the household to supply power to the air conditioner.
High-power compensation type - purification regulator (including precision regulator)
It uses the compensation link to achieve stable output voltage and easy to implement microcomputer control.
Its advantages are good anti-interference performance, high voltage regulation accuracy (≤±1%), fast response (40~60ms), simple circuit and reliable operation. The disadvantages are: low-frequency oscillation with a non-linear load such as a computer, a program-controlled switch, a large current distortion on the input side, and a low source power factor; the output voltage has a phase shift on the input voltage. Units with high requirements for anti-interference function should be applied in the city. When the computer is powered, it must be used with a voltage regulator of 2-3 times the total power of the computer. Because it has the advantages of voltage regulation, anti-interference, fast response and moderate price, it is widely used.
Switching AC regulated power supply
It is applied to 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 and the same phase of the AC voltage. Its output voltage waveform has quasi-square wave, ladder wave, sine wave, etc. The uninterruptible power supply (UPS) on the market removes the storage power supply and charger, which is the regulation of a switching AC regulated power supply. Good performance, strong control function, easy to achieve intelligence, is a very promising AC regulated power supply. However, due to its complicated circuit and high price, the promotion is slow.
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Label: Power term
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