The telecommunication department's mechanical and electrical system is the modern management which realizes through the modernization electronic technology and the equipment, it involves to the mechanics of communication, the electronic technology, the automatic control, the computer technology and so on many disciplines, have technology-intensive, high tech, characteristics and so on high performance. The power supply is electromechanical device's foundation, the power supply had problems, will bring a series of questions, will interrupt. Therefore set the strict request to UPS, the related department to enhance power supply system's reliability, increased the first-level parameter manostat in front of UPS, like Figure 1.
Manostat's type are many, the common manostat includes: The automatic voltage regulator, purifies the power source exchange manostat, the parameter manostat, the NPS intelligence voltage-stabilized source. Presently separately introduces as follows:

First, automatic voltage regulator
    This kind of manostat structure is simple, low in price, but the reliability is bad. Because it is (glide or trundle) comes the constant voltage depending on carbon brush's migration, as shown in Figure 2. The control circuit basis output hypothesis's situation, controls M spot to reciprocate that causes the output voltage to meet the load requirement. This kind of electric circuit's shortcoming is the reliability low and the dynamic response speed is slow, does not isolate the disturbance. The carbon brush will thin slowly in the unceasing migration until the damage, the loss of life can be quicker in the humidity very big situation. Because is the mechanical movement, therefore the dynamic response is slow, this will cause the instantaneous voltage to rise with to fall suddenly suddenly, damages the following equipment.
For instance when the input voltage drops 15%, when namely 220V drops to 187V, to guarantee that the output was still 220V, M must on slide to N spot, by now change was 220:187=1.18, by now some large-scale perceptual load if downloaded suddenly, caused the city electricity voltage to have a 300V surge suddenly, as a result of M spot mechanical inertia, but moved without enough time, will present 354V in the out-port the high voltage, light, then caused the UPS battery discharge, the heavy piece burnt down the UPS input circuit. Otherwise, if has a large-scale perceptual load to load suddenly, also will present 100V hollow, also will cause UPS the battery discharge.

Second, purification power source exchange manostat
    This kind exchanges manostat's appearance is mainly replaces the original electromagnetism compensation type 614 manostats. This kind of manostat's principle is different forms the different equivalent inductance quantity according to the bidirectional silicon-controlled rectifier breakover angle, causes the output to carry on the compensation principle to the input change to carry on the constant voltage, principle as shown in Figure 3.
This kind of power source's stability is high, may achieve 0.1%, the efficiency is also high, may reach 97%, the output voltage profile degree of distortion is small, may achieve 0.2%. This kind of manostat's reliability is very high, has the isolation disturbance ability. By may also see, in the main circuit does not have the power tube, is the inductance and the electric capacity and so on passive component, an only semiconductor device or reliable very high bidirectional silicon-controlled rectifier. But this kind of electric circuit's shortcoming is the regulation band is narrow, generally only adapts the fixed network voltage ±10%, the power is not easy to do in a big way, this is unable to satisfy the telecommunication department's request obviously, therefore generally not in considers in the scope.

Third, parameter manostat
    1st, parameter manostat's principle of work
The parameter manostat is the early application quite universal manostat, this is one kind of basis ferromagnetic resonance principle carries on the constant voltage the electric circuit. Its merit is an entire electric circuit not transistor unit, is electric circuit which constitutes by the transformer and the electric capacity, therefore the reliability is quite high, because the parameter manostat is the work in the resonant condition, therefore isolation disturbance's ability is quite strong. Figure 4 showed the parameter manostat's principle of work. Because this electric circuit uses many, appears the question are also many, does in here one introduced in detail. The goal is understood that its good and bad points, achieve rationally the use. Its equivalent circuit is an inductance and an electric capacity series.
Electric capacity's capacitance is XC=1/(2fC); The inductance reactance is XL=2fL
In the formula: f- power frequency, HZ
C- electric capacity, F
L- transformer's inductance quantity, H
May know by the electric circuit, UC is on electric capacity's voltage, UL is in the inductance voltage; Ith, through on the resistance, electric capacity's electric current, on the induction reactance and the capacitance voltage difference position is 180, when they connect the voltage is the cancellation relations, when achieves the resonance, UC=UL, this time XC+XL=O. Therefore obtains:
f= <1>
This is the LC series circuit's resonance point, may see 3 questions by the above analysis:
When the input voltage achieves certain value, in the LC series circuit's impedance achieves the minimum value, or the electric current maximizing, namely the transformer enters the saturated condition, on transformer's voltage basically has been this time invariable, the output enters the constant voltage area.
Form fixed relations in resonance point LC and the power frequency, the type <1> may also use the angular frequency to indicate that namely
ω= <2>
After the resonance point, if the input voltage continues to elevate, then elevates the part completely added to the capacitor.
    2nd, parameter manostat merit:
    A, parameter manostat when resonance, because is the work in the saturated condition, therefore the external disturbance cannot cause the saturation current change, will therefore disturb isolates.
    B, because the input voltage elevates the part adds to completely the capacitor, therefore the permission input voltage transformation scope is big.
    C, because in the electric circuit does not have the electronic component, therefore the reliability is high.
    3rd, parameter manostat's shortcoming:
    A, because is the work in the saturated condition, therefore own power loss is big, the efficiency is low.
    B, because is the resonance in the power frequency, therefore is sensitive to the frequency change, once the power frequency changes, will create the failure of oscillations, once the failure of oscillations, it will store up in the inductance 3 time of above reactive power instantaneous release, will form the kilovolt high-pressured pulse outgoing transmission, will wreck its nearby equipment. Domestic some telecommunication department's multiple UPS is on fire creates by it.
    C, because is the resonance in the power frequency, if behind is the rectification load, the rectification produces the overtone will also cause the electric circuit failure of oscillations. According to the related scientific research institution's test, the parameter manostat's capacity wanted the several fold in the following load (model experiment was by now 10 times). Above telecommunication department's multiple UPS is on fire is because the parameter manostat's capacity is too small: For example one is the 15KVA parameter manostat brings 16KVA UPS, one is the 30KVA parameter manostat brings 40KVA UPS, is no exception nearly in several dozens sets of supplementary equipment.
    D, because in the electric circuit work was the internal storage massive reactive power, therefore the power input factor was low, could not use the input fully the city electricity, has taken the precious electrical energy resources.
The parameter manostat use compares the successful place is mostly the capacity quite big place or the condition quite good place. Therefore this kind of power source must use discretely, particularly requests the high place in the telecommunication department to like this guard against the hidden danger.
Fourth, NPS intelligence voltage-stabilized source this is a new technology, is the proprietary product which after summarizing the above several kind of manostat's good and bad points and has absorbed Delta converter technique experience develops. This kind of electric circuit both has used the current mature PWM technology, and unified the UPS Delta converter technique.

The NPS intelligence voltage-stabilized source effective addressing above several kind of manostats have existed question:
    1st, because has absorbed the Delta converter technique experience, therefore had its some merits, for instance the power input factor reaches as high as above 0.95, is much higher than the parameter manostat.
    2nd, the efficiency is high. May be easy from electric circuit's structure to see that it has concentrated automatic voltage regulator's merit. Moreover the reflection speed is quick, this is also the automatic voltage regulator is unable to compare.
    3rd, the input output isolation performance is good, this has concentrated the parameter manostat and purifies power source's merit. Because does not have the reactive power memory in the work, therefore does not exist wrecks other equipment's question.
    4th, the reliability is high. As a result of is the PWM electric circuit and the magnetic circuit union principle, the structure is dexterous, but is not the parameter manostat such is likely unwieldy.
    5th, because the working efficiency is high, lost is small, causes within the aircraft the temperature not to be high, enhanced machine's reliability.
    6th, may the intelligent monitoring. The machine leaves leeway the RS232 serial port, may make the long-distance monitoring.
    7th, the capacity may do very much in a big way, purifies the power source and parameter manostat such not likely most greatly can only achieve several dozens kilovolt amperes.
Had like on merit, in the power distribution should be the first choice.