What are the classifications and advantages of power adapter in application

(1) Classification of power adapters

According to the filter used, the power adapter can be divided into current mode and voltage mode. The direct current can be obtained by filtering the current mode with DC smoothing reactor. The load current is rectangular wave, and the load voltage is approximately sine wave. The direct voltage can be obtained by using capacitor filter in voltage mode. The voltage at both ends of the load is rectangular wave, and the load Power Supply is approximately 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. Current mode is commonly used in parallel and series parallel resonant inverters, and voltage mode is commonly used in series resonant inverters.

(2)Power adapter benefits

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

The main results are as follows:

(1) the starting mode of modern power adapter is self-excited sweep frequency zero voltage soft starting mode. In the whole process of start-up, the frequency control system and the current and voltage regulation closed-loop system always track the change of load to realize the ideal soft start. This starting mode has little effect on the thyristor, which is beneficial to prolong the service life of the thyristor, and has the advantages of light, heavy load and easy starting. Especially for the whole steelmaking furnace, the cold furnace can be started easily.

(2) The modern power adapter control circuit adopts the microprocessor constant power control circuit, and the inverter angle automatic regulation circuit is installed. In the process of operation, it can automatically monitor the changes of voltage, current and frequency at any time, judge the load changes, automatically adjust the load impedance matching, realize constant power output, achieve the purpose of energy saving and improving power factor, with obvious energy saving effect and small power pollution.

(3) The control circuit of modern power adapter is designed by CPLD software. The program input is done by computer. High pulse precision, anti-interference, fast response speed and convenient debugging. It has the functions of cut-off, cut-off, over-current, over-voltage, under voltage, inter phase gap and other protection functions. Because circuit components always work under safety standards. In the case, the service life of the power adapter is greatly improved.

(4) The modern power adapter can automatically judge the phase sequence of the three-phase air intake line, without distinguishing a, B, C three-phase sequence, so it is very convenient to debug.

(5) The modern power adapter circuit board adopts automatic wave soldering without virtual soldering. All kinds of regulating systems adopt non-contact electronic regulation, with no failure point, low failure rate and convenient operation.

Best regards,

Shirley Liang