What are the classifications and advantages of the power adapter in the application?

November 19, 2019

1) Classification of power adapters
Depending on the filter used, the power adapter can be divided into current mode and voltage mode. The current mode is filtered by a DC smoothing reactor to obtain a relatively straight DC current. The load current is a rectangular wave and the load voltage is approximately sinusoidal. The voltage mode is capacitor filtered to obtain a relatively straight DC voltage. The voltage across the load is a rectangular wave, and the load supply is approximately sinusoidal.
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 for parallel and series-parallel resonant inverters, and voltage mode is often used for series resonant inverters.
2) Advantages of the power adapter
The power adapter is a static variable frequency power supply composed of power semiconductor components. It is a static frequency conversion technology that converts power frequency (50 Hz) to intermediate frequency (400 Hz~200 kHz) through a thyristor. It has two frequency conversion methods: AC-DC-AC and AC-AC. 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 size, light weight, simple installation, convenient operation and maintenance, etc. It is widely used in building materials and metallurgy. National defense, railway, petroleum and other industries. The power adapter is efficient and variable in frequency. The main technologies and advantages of modern power adapters are as follows.
The main results are as follows: (1) The startup mode of modern power adapter adopts self-excited sweep frequency zero voltage soft start mode. Throughout the start-up process, the variable frequency speed control system and the current-voltage regulation closed-loop system always track the change of load to achieve the ideal soft start. This kind of starting mode has little effect on the thyristor, which is beneficial to prolonging the service life of the thyristor, and has the advantages of light weight, heavy load and easy starting. Especially in the steel furnace, the furnace can be easily started.
(2) The modern power adapter control circuit uses a microprocessor constant power control circuit and an automatic adjustment circuit for the inverter angle is installed. During the operation process, the voltage, current and frequency changes are automatically monitored at any time, the load changes are judged, the load impedance matching is automatically adjusted, the constant power output is realized, the energy saving and the power factor are improved, the energy saving effect is obvious, and the electric energy pollution is small.
(3) Modern source adapter control circuit is designed by CPLD software. Its program input is done by the computer. High pulse precision, anti-interference, fast response and convenient debugging. It has protection functions such as cut-off, cut-off, over-current, over-voltage, under-voltage, and phase-to-phase gap. Because circuit components always work under safety standards. In the enclosure, the life of the power adapter is greatly increased.
(4) The modern power adapter can automatically judge the phase sequence of the three-phase intake line, and does not need to distinguish the three-phase sequences of A, B, and C, and the debugging is very convenient.

(5) Modern power adapter circuit board uses automatic wave soldering, no need for virtual soldering. All kinds of adjustment systems adopt non-contact electronic adjustment, no fault point, low failure rate and convenient operation.

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Lori Lin

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