semiconductor refrigeration

Return loss in high frequency applications, reflected wave protection equipment in the transition point was the proportion of reflected in the parameters can be directly measured, protection devices and systems Chung-wave impedance matching degree for the data transmission system, in order to prevent bit error, the system's return loss must be greater than 20dB. Maximum discharge current (Imax) arrester must withstand 8 / 20 waveform (see DIN VDE 0432/10.78 part3) of the test current, without causing damage.

protector must be able to withstand 2 times such a large current edit field of this paragraph the use of power supply products are widely used in industrial automation and control, military equipment, scientific equipment, industrial equipment, computer and communications equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration heating and other fields.Mini Wireless Keyboard Classification of power and knowledge

1, AC power supply classification and characteristics: the ability to provide a stable power supply voltage and frequency stability of said AC power source. At present, most manufacturers work is AC voltage stability. The following combination of AC power supply market some briefly the classification features. Parameter adjustment (resonant) type such power supply, regulator of the basic principles of the LC series resonance, the early emergence of magnetic saturation regulator belongs to this class, which has the advantage of simple structure, no large number of components, reliability is very high voltage range is pretty wide,Patch Cord Manufacturer anti-jamming and anti-overload. drawback is energy consumption, noise, heavy and high cost.

In the magnetic saturation based on the principle of development into the parameters of the regulator and the formation of the 50's has been popular in China, "magnetic amplifier voltage regulator adjustable electronic communication" (ie 614) are the principle of exchange of such regulators. Auto (Ratio) adjustable
1, the mechanical pressure regulator type, that is driven by servo motor carbon brush autotransformer winding sliding surface moves, changing the ratio of Vi Vo on, in order to achieve output voltage regulation and stability. The kind of regulator from a few hundred watts to several kilowatts.

It is characterized by simple structure, low cost, output waveform distortion; but easy to produce carbon brush sliding contacts spark,Cable Manufacturer causing damage and even burned brush and void; and slow voltage regulation. 2, change the tap-type, will be made of multiple fixed-tap autotransformer, through the relay or triac (solid state relay) as the switching device 10, automatically change the tap position, in order to achieve a stable output voltage. Advantages of this type of regulator is a simple circuit, voltage range (130V-280V),electric welding machine manufacturer high efficiency (≥ 95%), low price.

The disadvantage is the low voltage accuracy (± 8 ~ 10%) working life is short, it applies to the family to power air conditioners. High Compensation - purification Regulator (with precision regulator), with the compensation part of it to achieve a stable output voltage, easy to implement computer control.

It has the advantage of anti-jamming performance, high precision voltage (≤ ± 1%), fast response (40 ~ 60ms), the circuit is simple, and reliable. The disadvantage is: with a computer, program-controlled switches and other nonlinear loads are low-frequency oscillations;

the input side of the current distortion degree, the source power factor is low; output voltage on the input voltage phase shift. Anti-jamming capabilities for higher units, dvb manufacturer the application is appropriate in the city, computer power supply, you must use the computer 2-3 times the total power of the regulator to use. Due to a regulation, interference, fast response, affordable, etc.,

so widely used. Switching AC power supply that applies high-frequency pulse width modulation switching power supply with the general difference is its output must be above the input side of the frequency-phase AC voltage. Its output voltage waveform with quasi-square wave, trapezoidal wave, sine wave, etc.,

uninterruptible power supply on the market (UPS) deprived of the power supply and battery charger in which the build is a switching regulator type AC power supply good, control is strong, intelligent and easy to implement, is very promising AC power supply. However, because of circuit complexity, higher prices, so the promotion is slower.