1、 外文资料原文 Regulators Regulators: it is a kind of can automatically adjust the output voltage of power supply circuit or device, its effect is not share fluctuates greatly and electric equipment in the power supply voltage stability requirement, within the scope of its value to various circuit or elect
2、rical equipment in the rated voltage can work properly. Regulators have: large decades to hundreds of power voltage is kw supply large laboratory equipment work power. There are several small earthen to several kilowatts of ac regulator, is for small laboratory or household appliances provides high
3、quality power, Initial power voltage is the voltage stability by relays beating. When the voltage regulator, the electric volatility of automatic correction circuit, make interior relay action. Forcing output voltage value in this circuit is near the simple circuit, defect is not high voltage accura
4、cy and each time relay beating will supply power shift occurs once interrupt and the instantaneous sparks interference. The computer equipment and work, easy to cause disturbance computer error signal, serious when still can make the result of a damaged disk. Now the small voltage, high quality carb
5、on brush is used mostly motor, the stability of the method of voltage regulator electrical equipment of the interference is relatively high voltage accuracy. (1) the stabilizer principle By regulating voltage circuit, control circuit and servo motor, etc, when the input voltage or load changes, the
6、control circuit of sampling, comparison, amplification, and then drive to the regulator servo motor rotation, the position of the carbon brush, through the automatic adjustment coil ratio, and maintain the stable output voltage. The large capacity and voltage regulator using the principles work. (2)
7、 voltage product classification According to the working state of adjustment tube, often manostat into two categories: linear manostat and switching power supply. In addition, there is a use of small power supply voltage regulator, switch. Switching voltage regulators, repeated use of output level s
8、witch open and off condition, and energy storage components (capacitor and sensor) produce output voltage. It is through the adjustment according to the output voltage feedback samples to adjust to switch regularly. In a fixed frequency stabilizer, through adjusting the switching voltage pulse width
9、 to adjust the switching time, this is the so-called PWM control. In the door or pulse oscillator model stabilizer, switch pulse width and frequency constant, but output switch open or off by feedback control. According to the switch and energy storage components, the arrangement of the output volta
10、ge can be more or less than the input voltage, and can use a multiple output voltage regulator. In most cases, the same input voltage and pulse output voltage, (step-down) switching voltage regulators than linear regulators conversion power efficiency is higher. Compensating - precision exchange com
11、pensating voltage stabilizer (single-phase and three-phase kVA 0.5, 1.5 kVA transformer, compensation and above), there are 110V output. LDO is a linear regulators. The use of linear regulators in linear area of transistors or FET, running from the input voltage applied in excess of voltage, minus t
12、hrough adjusting the output voltage. So-called pressure drop, refers to the voltage regulator will maintain its output voltage rating 100mV fluctuation in the input voltage and within the required minimum value of output voltage difference. Is the output voltage regulator LDO (low pressure drop) oft
13、en use power transistors (also called transmission equipment) as a PNP. This kind of transistors allow saturated, so the regulator can have a very low pressure drop, usually for 200mV voltage, Compared with the use of composite power transistor, the traditional NPN linear regulators pressure drop fo
14、r 2V. Negative LDO output as its transmission using NPN transistors, its operation mode and equipment are similar to the PNP device LDO output. Update of development, it is used for power transistor could provide the lowest pressure drop voltage. Using CMOS, through the voltage regulator pressure dr
15、op is power equipment load current ON resistance. If the load is lesser, this way of pressure drop dozens of millivolt. (3) voltage main technical parameters Project single-phase three-phase (three-phase four-wire mode, points). Input voltage regulator 160V 250V phase voltage range for 160V 250V. Fo
16、r 280V 430V line voltage. Voltage output voltage 220V or 110V phase voltage 220V line voltage 380V. Regulators 246V 4V overvoltage protection value 246V phase voltage 4V (phase voltage). 426V voltages Steady pressure regulator pure degree 3% (4) stabilizer selection method 1, the capacity of safety
17、coefficient Ac voltage stabilizer based on output power (nai) for nominal kVA ratings, normally not pure resistive load of power factor, which indicates COS, stabilizer actually can output the active power (kW = capacity kVA COS) x. So in practice according to the model selection of electrical equip
18、ment and power factor and rated power load type concrete circumstance reasonable selection, the power output voltage power supply should leave appropriate allowance, especially the badly-impactive loads to larger sized allowance, specific type safety coefficient table saw. Load property equipment ty
19、pe selection manostat capacity safety coefficient. Pure resistance loaded incandescent lamp, electric equipment, electric resistance 125 1.5 125 1.5 times the total power load. Perceptual, fluorescent lamps and lanterns, capacitive load motor, water pump, fan, air conditioning, computer, refrigerato
20、rs, 2 3 p 2 3 times the total power load. Big inductive, capacitive load (such as electric motors, computer) environment, should be considered when the load selection (especially large starting current rated current of 5 8 times), so choose stabilizer capacity should be load power 2.5-3 times. Such
21、as: three-phase 2.2 kW, 5.5 kW, one chooses stabilizer, capacity experiment.it (2.2 kW + 5.5 kW) x 2.5 = 19.25 kVA, namely, at least to choose three-phase SJW - 20 kVA above product stabilizer. 2 The compensating voltage power output capacity curve The type of single-phase stabilizer (0.5 3kVA kVA 1
22、0k, horizontal and below, and below) 9kVA three-phase voltages below 198V phase when the input and output capacity began to decline, 160V equals input phase voltage regulator, down to the rated capacity of 50%. So in the low voltage particular attention to reduce load drop frontal use, lest make the
23、 stabilizer overload burned. The regulator can output 220V type two kinds of voltage and 110V. But even if all the output voltage by 110V with load cannot exceed 50%, or it is the capacity of overload. (5) voltage range Stabilizer can be widely applied to industrial and mining enterprises, oilfield,
24、 railway, construction site, schools, hospitals, telecommunications, hotels, scientific research departments of electronic computers, precision machine tools, computed tomography (CT) scan, precision instrument, test equipment, lighting, elevator imported equipment and production line needs power th
25、e voltage stability. Also suitable for low or high voltage and low voltage distribution network fluctuation of big changes in the end user and load of electric equipment, especially suitable for all of the high voltage electricity requirement waveform. High power voltage compensation can receive fir
26、e, hydraulic, small generators. (6) The technical parameters A. the input voltage regulator has A range. IEC standard for input voltage rating in the range of 10. More automatically sound-light alarm output voltage stability and not required in scope. B. Output voltage regulation is caused by change
27、s in the input voltage output changes, when the effect of load rating, according to the input voltage source voltage range to rise by ratings to limit and to limit, maximum output voltage measurement of changes (). This value is measured to 55x55mm are the important index of ac regulator performance
28、. C. Load regulation: is caused by changes in the load variation of output. Change the load current output voltage, measure the size of the variation (). This value to 55x55mm are measured, and also is an important index of ac regulator performance. D. Output voltages relative harmonic content (also
29、 called output voltage distortion degree), usually expressed in THD, total harmonic content is effective and the wave RMS, rated load than when the input voltage, the distortion degree (usually meet datum condition should be less than 3), the input voltage for the lowest rating, and high output voltage measurement attributes, the distortion degree. This value to 55x55mm are. E: The efficiency is the active power output and input of active power P0 than (Pi) the percentage.
