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Introduction to the advantages and disadvantages of power adapters

source:power adapter     Popular:adapter     release time:2021-04-21 09:50:28     Article author:sznbone    

  Introduction to the advantages and disadvantages of power adapters

  1) Advantages of power adapter

  The power adapter is a static frequency conversion power supply composed of power semiconductor components. It is a static frequency conversion technology that converts the power frequency (50Hz) to the intermediate frequency (400Hz~200kHz) through a thyristor. It has two frequency conversion methods: AC-DC-AC frequency conversion and AC-AC frequency conversion. Compared with the traditional power generator set, it has the advantages of flexible control mode, large output power, high efficiency, convenient operation frequency change, low noise, small size, light weight, simple installation, easy operation and maintenance, etc. It is used in building materials, metallurgy, It has been widely used in national defense, railway, petroleum and other industries. The power adapter has high efficiency and variable frequency. The main technologies and advantages of modern power adapters are as follows.

Introduction to the advantages and disadvantages of power adapters(图1)

  (1) The start-up method of modern power adapter adopts the swept frequency zero-voltage soft start method in the form of self-excited and self-excited. During the whole start-up process, the frequency regulation system and the current and voltage regulation closed-loop system always track the change of the load to achieve the ideal Soft start. This start mode has little impact on the thyristor, which is beneficial to prolong the service life of the thyristor. It also has the advantages of easy starting at light and heavy loads, especially when the steelmaking furnace is full or cold.

  (2) The control circuit of the modern power adapter adopts a microprocessor constant power control circuit, and is equipped with an inverter Ф angle automatic adjustment circuit. During operation, the voltage, current, and frequency changes are automatically monitored at any time, and the judgment When the load changes, it can automatically adjust the matching of load impedance and output constant power, so as to achieve the purpose of saving time, saving electricity, and improving power factor. The energy saving is obvious, and the grid pollution is small.

  (3) The control circuit of the modern power adapter adopts CPLD software design, and its program input is completed by a computer. It has high pulse accuracy, anti-interference, fast response speed, convenient debugging, and has cut-off, cut-off, over-current, over-voltage, and under-voltage. , Lack of multiple protection functions, because the circuit components always work in the safe range, which greatly improves the service life of the power adapter.

  (4) Modern power adapters can automatically determine the phase sequence of the three-phase incoming line, without distinguishing the A, B, and C phase sequence, and the debugging is extremely convenient.

  (5) The circuit boards of modern power adapters are all made of automatic wave soldering, and there is no false soldering phenomenon. Various adjustment systems are all non-contact electronic adjustments, no fault points, extremely low failure rate, and extremely convenient operation.

  2) Classification of power adapters

  According to the different filters used, the power adapter can be divided into current type and voltage type. The current type is filtered by a DC smoothing reactor to obtain a relatively straight DC current, the load current is rectangular wave, and the load voltage is similar to a sine wave; the voltage type is filtered by a capacitor to obtain a relatively straight DC voltage, and the voltage at both ends of the load It is a rectangular wave, and the load power is approximately a sine wave.

  According to the load resonance mode, the power adapter can be divided into three types: parallel resonance, series resonance and series-parallel resonance. The current type is often used in parallel and series-parallel resonant inverter circuits; the voltage type is mostly used in series resonant inverter circuits.


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