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Structure and technical parameters of voltage regulator

Resource:Jichen Electric Co., Ltd Addtime:2020-05-20 08:00:45 Clicknum:

Structure and technical parameters of the pressurizer:

Pressurizer Construction:

A typical switched capacitor converter consists of four large MOS switches whose switching sequence is typical switching, doubling or halving the input supply voltage. The transmission and storage of energy are provided by external capacitors. For example, with the problems in market environment, production and operation, product import and export, industry investment environment and sustainable development of China's isolation transformer products, China has made a qualitative and quantitative analysis and prediction of the industry development trend on this basis. Engaged in the production, R & D and sales of transformers, regulators, regulators and other low-voltage supporting products, "adhere to enterprise innovation, the main products are: SBW high-power compensated power regulators, sbw-f sub regulation power regulators, SVC high-precision full-automatic AC regulators, precision purification regulators, microcomputer contactless regulators, SG \ SBK isolation transformers, OSG \ QZB autotransformers, ZSG \ ZD G rectifier transformer, SSG servo transformer, DN resistance welding water-cooled transformer, reactor, contact type auto coupling voltage regulator, column type high-power electric voltage regulator and other complete electrical equipment. The product has the advantages of novel design, small volume, beautiful shape, low loss, low noise, impact resistance, etc. It is widely used in industrial and mining enterprises, textile machinery, printing and packaging, petrochemical industry, schools, shopping malls, elevators, post and telecommunications, medical machinery and other occasions requiring normal voltage guarantee.

In the first part of the switching cycle, the input voltage acts on a capacitor (C1). In the second part of the switching cycle, the charge is transferred from C1 to the second capacitor C2. The most traditional construction of the switched capacitor converter is a reverse converter, in which C2 has a positive terminal grounded and its negative terminal transmits the negative output voltage. After several cycles, the voltage through C2 is applied to the input voltage. Assuming that there is no load on C2, no loss on the switch, and no continuous resistance in the capacitor, the output voltage will be exactly a negative number of the input voltage. In reality, the efficiency of charge transfer (and the accuracy of the resulting output voltage) depends on the switching frequency, the resistance of the switch, the value of the capacitor, and the continuous resistance. A similar topology uses the same switch and capacitor bank, but changes the ground connection and input voltage. Other more complex variants use additional switches and capacitors to achieve other conversion ratios of input voltage to output voltage, and in some cases, special switching sequences are used to generate fractional relationships (e.g., 3 / 2). Among the simplest forms, the switched capacitor converter does not have voltage stabilizing function. Some new national semiconductor switched capacitor converters have an automatically adjusted gain level to produce a regulated output; others use a built-in low dropout linear regulator to produce an un regulated output.

Technical parameters of pressurizer:

A. The regulator has an input voltage adaptation range. The IEC standard is that the input voltage changes within ± 20 of the rated value. If it is out of the range, it will automatically sound and light alarm and the output voltage cannot be stabilized within the required range.

B. The output voltage regulation rate is the effect of the change of input voltage that causes the change of output. When the load is rated, the input voltage shall be increased from rated value to upper limit value and lower limit value according to the source voltage range, and the maximum change of output voltage (±) shall be measured. The smaller the value is, the better it is. It is an important index to measure the performance of AC voltage regulator.

C. Load adjustment rate: it is the effect of load change on output change. Change the load current and measure the change of output voltage (±). The smaller the value, the better, it is also an important index to measure the performance of AC voltage regulator.

D. Output voltage relative harmonic content (also known as output voltage distortion degree), usually expressed by thd, is the ratio of total effective value of harmonic content to fundamental effective value. When the load is rated and the input voltage distortion degree meets the reference conditions (generally less than 3), measure the output voltage distortion degree when the input voltage is the lowest, rated and highest value, whichever is the largest. The smaller the value is The better

E. Efficiency: is the ratio (percentage) between the output active power P0 and the input active power PI

F. Load power factor

The capacity of the voltage regulator is expressed by VA or KVA, which means that in addition to the pure resistive load, there are inductive and capacitive loads, that is, in addition to the active power, there are also reactive power in the load. This indicator reflects the ability of AC regulated power supply with inductive and capacitive load.

General AC stabilized voltage power supply, the load power factor cos φ is 0.8, when the product is 1kW, the maximum output active power (i.e. the capacity of load with resistance) is 800W. If the product is represented by 1kW (COS φ is still 0.8), the output active power is 1kW, and the output power is s = 1000 / 0.8 = 1250va. A small value of load power factor indicates that the power supply equipment has a strong ability to adapt to reactance load.

G. The parameters of the AC voltage regulator include output power, input frequency, source frequency effect, random deviation (time drift), no-load input power, source power factor (this value is different from the load power factor, I hope the greater the better, the maximum is 1), relative harmonic content of source current, audio noise, three-phase AC voltage regulator, and three-phase output voltage imbalance, etc The definitions and test methods of these pointers can refer to relevant standards.