Weak current College】 【power of classification and knowledge】.

<br> 1. AC regulator classification and characteristics: <br> <br> To provide a stable voltage and frequency stability of power known as AC power supply. At present, most of the work done by the manufacturer is AC voltage stability. The .following combined market of exchange regulator power supply brief characteristics of their classification. <br> <br> Parameter adjustment (resonance) <br> <br> This type of power supply, regulated by the basic principle is LC Series resonance, early type of .magnetic saturation voltage regulator would fall into this category-it has the advantage that the structure is simple, without a large number of components, reliability is high voltage range is very wide, anti-jamming ability and overload is energy consumption. shortcomings of large, .noisy, heavy and high cost. <br> <br> In magnetic saturation on the basis of the principle of development into the formation of parameter regulators and our 50 years already popular "magnetic amplifier adjustment type electronic AC regulator" (that is, 614 .-type) are of such a principle of AC voltage regulator. <br> <br> Autotransformers (ratio) of the adjustment type <br> <br> 1, mechanical regulator type, servo motor driving the carbon brush in auto-transformer winding .of the sliding surface on the move, change the ratio of the Vo to Vi in order to achieve the output voltage adjustment and stability. Such a regulator can, from a few hundred watts to several kW. It features a simple structure, low cost, .small output waveform distortion; but because of the carbon brush sliding contacts is easy to produce sparks, causing damage and burning and brushes; and slow voltage adjustment. <br> <br> 2. change the tap, auto-transformer into multiple fixed pigtail ., relay or SCR (solid state relay) as a switch for 10 pieces, automatically change the tap location, thus achieving the stability of the output voltage. <br> <br> The advantages of such type of regulator is the circuit is simple, .steady voltage range (130V-280V), high efficiency (more than 95%), lower price. But the disadvantage is the low voltage-stabilizing accuracy (± 8 ~ 10%) of working life is short, it applies to the family to .the air conditioner. <br> <br>-High power compensation - purified regulators (including precision regulator) <br> <br> It uses the compensation aspect of achieving stable output voltage of the microcomputer control, easy to implement. <br> .<br> Its advantages are better anti-interference performance, high-voltage stabilizing precision (≤ ± 1%), fast response (40 ~ 60ms), the circuit is simple, reliable work. The disadvantage is: with a computer, program- .controlled switches, and other non-linear load time-frequency oscillation phenomena; input current distortion, active power factor is low; output voltage on the input voltage with phase shift. On the anti-jamming capability request high units, in the city as to .when the computer power supply, you must use the computer power of 2-3 times regulator. Who has the constant voltage, anti-interference, response is fast, affordable, etc., so widely. <br> <br> Switching AC regulated .power supply <br> <br> It applies to high-frequency PWM technology, and General switching power supply's difference is that its output must be input side ibid. frequency, in-phase AC voltage. Its output voltage waveforms have prospective square, trapezoid .wave, sine wave, the market of uninterruptible power supply (UPS) sucks the storage power and charger is a switched Exchange regulator power supply voltage is good, control functions, easy to achieve intelligent, is very promising exchange regulator power supply. But because of .its circuit complexity, higher prices, thus promoting more slowly. <br> <br> 2, DC stabilized power supply kinds and choice: <br> <br> DC stabilized power supply according to habit can be divided into chemical power, linear stability .stable power supply and switching power supplies, they also have a variety of different types: <br> <br> Chemical power <br> <br> We usually used for dry batteries, lead-acid batteries, nickel-cadmium, nickel-metal .hydride, lithium ion batteries are belong to this category, each has its advantages and disadvantages. With the development of science and technology, and produces intelligent battery; in rechargeable battery materials, development officers, MN United States an iodide, use it to make cheap ., compact, discharge of a long time, after repeated charging and still keep the good performance of environment-friendly rechargeable battery. <br> <br> Linear stability power <br> <br> Linear stability of power have a common characteristic is its .power devices to adjust work online sexual area, adjust the voltage drop between the pipe to maintain the stability of the output. Since the regulation tube static loss, you need to install a large heat sink to its cooling. Moreover, because transformer in power frequency .(50Hz), so the greater weight. <br> <br> The advantages of such a power is high stability, high reliability low ripple, and easy to create multiple, adjustable output of the finished product. The disadvantage is less bulky, heavy ., efficiency was relatively low. Such a stable power supply and there are many, from the output property can be divided into regulated power supply and power of steady flow and set voltage, steady flow in a voltage regulator (bistable) power. Judging from the .output values can be divided into fixed output power, band switch adjustment and potentiometer several continuous adjustable. From the output indicates that the pointer indicates on separable type and digital display-type, and so on. <br> <br> Switching DC power supply .<br> <br> And linear regulated power supply different class of stable power supply is switched DC regulated power supply, its main circuit type Flyback, converter, half-bridge, push-pull and full-bridge. It is the fundamental difference between .linear power is that it does not work in power transformers and is working in several dozens kHz to few MHz. Function tube not working in saturated and cut-off region ie switch status; switch power accordingly. <br> <br> Switching power supply .has the advantage of small volume, light weight, stable and reliable; disadvantage relative to linear power supplies, ripple larger (General ≤ 1% VO (PP), good to do a dozen mV (PP) or smaller). It's power from the .few-there are a few kW. Price for 3 Yuan-shijiwanyuan/Watt, the following classification is generally used to describe several kinds of switching power supply: <br> <br> ①, AC / DC power supply <br> <br .> Such power, also known as a power supply, it has achieved energy gridAfter a high voltage rectifier filtering for DC high voltage DC / DC converters in the output for one or several stable DC voltage, power from the few-there are a few kW ., used for the different occasions of products. In the case of such product specifications model range, according to user needs in communication power of a power supply (AC220 input, 24V output or DC48V) also belong to this class. <br> <br .> ②, DC / DC power supply <br> <br> In the communication system, also known as a secondary power supply, it is a power supply or DC Battery Pack provides a DC input voltage, the DC / DC converter after output by .one or several DC voltage. <br> <br> ③, communication power supply <br> <br> Communication power supply its essentially DC / DC converters-power supplies, but it generally to DC-24V power supply 48V or-, and .back-up battery backup power supply for DC, DC supply voltage transformation into circuit voltage, it is divided into a central power supply, power supply and single tier three, after the highest reliability. <br> <br> ④, radio power < .br> <br> Radio power input, output AC220V/110V DC13.8V, power supply from the power station, there are several hundreds of Ontario Anjun products to prevent effects of AC power, and radio work needs to have a battery pack as a .backup, so this kind of power in addition to output a 13.8V DC voltage, charge the battery with the automatic conversion features. <br> <br> ⑤, power modules <br> <br> With the rapid development of science and technology ., power reliability, capacity / volume ratio of increasingly demanding, power modules and more show their superiority, its operating frequency is high, small size, high reliability, easy to install and portfolio expansion, so more and more widely adopted. At present, the .current domestic production despite the corresponding module, but due to the production process could not catch up with international standards, the high failure rate. <br> <br> DC / DC module power supply current while costs more, but from the application of the .product of a long cycle of the overall costs, in particular due to system failure of high maintenance costs and loss of goodwill, the choice of the power supply module or pay off, in this it is also worth mentioning that Roche converter circuit, it's the .big advantage is the circuit simple structure, high efficiency and output voltages, currents of ripple values close to zero. <br> <br> ⑥, special power supply <br> <br> High-voltage and low current power, high current power .supply, AC/400Hz input DC power supply, etc, can be attributed to this class, you can choose according to special needs. Switching power supply's price is generally 2-8 Yuan / w special low power and high power prices slightly higher, up .to $ / 11-13..