High-frequency inverters are switching devices used in the industrial field. The working principle of high-frequency inverters is controlled by program logic. High-frequency inverters can be used in the telecommunications industry and are a type of switchgear for computer rooms. This kind of power supply can be used in the solar energy industry and power generation industry. It is a switching power supply device that uses data line output and is very safe. This article mainly introduces the working principle of high-frequency inverters and the difference between high-frequency inverters and low-frequency inverters.

A high-frequency inverter is a DC to AC transformer. In fact, it is a voltage inversion process. The working principle of high-frequency inverter, the converter is to convert the AC voltage of the power grid into a stable 12V DC output, and the inverter is to convert the 12V DC voltage output by the Adapter to high-frequency high-voltage AC; both parts are also Uses more widely used pulse width modulation (PWM) technology. The core part is a PWM integrated controller, Adapter UC3842, inverter uses TL5001 chip. TL5001 operating voltage range 3.6 ~ 40V, its internal error amplifier, a regulator, oscillator, PWM control with dead-zone control, low-voltage protection circuit and short circuit protection circuit.

1. Input connection [Section: There are 3 signals in the input part, 12V DC input VIN, the working enable voltage ENB and the Panel current control signal DIM. VIN is provided by the Adapter. The ENB voltage is provided by the MCU on the motherboard. The value is 0 or 3V. When ENB=0, the inverter does not work, and when ENB=3V, the inverter is in normal operation and the DIM voltage is The mainboard provides changes in the range of 0~5V. Different DIM values ​​are fed back to the feedback end of the PWM controller. The current provided by the inverter to the load will also be different. The smaller the DIM value is, the lower the output current of the inverter will be. The bigger.

2, voltage start circuit: ENB is high, the output high voltage to light the Panel's backlight lamp.

3. PWM controller: It has the following functions: internal reference voltage, error amplifier, oscillator and PWM, overvoltage protection, undervoltage protection, short circuit protection and output transistor.

4, DC conversion: MOS switch and energy storage inductors form a voltage conversion circuit, the input pulse after the push-pull amplifier amplification drive MOS tube switch action, so that the DC voltage on the inductor charge and discharge, so that the other end of the inductor can Get AC voltage.

5, LC oscillation and output circuit: to ensure that the lamp starts the required voltage of 1600V, and after the lamp starts to reduce the voltage to 800V.

6, the output voltage feedback: When the load is working, feedback sampling voltage, play a role in stabilizing the inverter voltage output.

1. Square Wave Inverter

The waveform of the AC voltage output by the square wave inverter is a square wave. The inverter circuit used in this type of inverter is not exactly the same, but the common feature is that the line is relatively simple and the number of power switch tubes used is very small. The design power is generally between 100 watts and kW. The advantages of the square wave inverter are: simple circuit, cheap price, and easy maintenance. The disadvantage is that because the square wave voltage contains a large number of high-order harmonics, additional losses will occur in the load consumers with core inductors or transformers, which will interfere with radios and certain communication equipment. In addition, such inverters have shortcomings such as insufficient voltage regulation range, insufficient protection function, and relatively large noise.

2, step wave inverter

The waveform of the AC voltage output by this type of inverter is a staircase wave. The staircase wave output of the inverter also has many different lines, and the number of steps of the output waveform varies greatly. The advantage of the staircase wave inverter is that the output waveform is significantly improved than the square wave, and the higher harmonic content is reduced. When the ladder reaches 17 or more, the output waveform can achieve a quasi-sine wave. When the transformerless output is used, the overall efficiency is high. The disadvantage is that there are more power switch tubes used in the staircase wave superposition circuit, and some of the circuit types also require multiple sets of DC power input. This brings trouble to the grouping of solar cell arrays and the balanced charging of wiring and batteries. In addition, the staircase wave voltage still has some high-frequency interference on the radio and some communication equipment.

1. Wide input voltage range, high voltage regulation accuracy, and strong environmental adaptability;

2, using a dedicated microprocessor control, digital technology, the international leader;

3, pure sine wave output, excellent electrical performance indicators;

4, LED + LCD liquid crystal display, man-machine interface is friendly, intuitive and convenient, can always display the inverter working status, load status, environmental status and parameters;

5, arbitrarily choose the bypass priority or inverter priority;

6, input and output electrical isolation, can withstand the computer load boot surge;

7, high efficiency inverter, low no-load loss;

8, advanced manufacturing technology, products generous and beautiful;

9, with input over, under voltage, reverse protection; output overload, short circuit protection; high and low voltage and other series of protection of the bypass;

10. In the absence of DC, it can be switched on and started.

11, fully automated maintenance, for unattended station.

1. According to the frequency division table formulated by the Institute of Electrical and Electronics Engineers (IEEE), the low frequency frequency is 30~300kHz, the intermediate frequency frequency is 300~3000kHz, the high frequency frequency is 3~30MHz, and the frequency range is 30~300MHz, which is VHF In the 300 ~ 1000MHz for the UHF. Compared to low-frequency signals, high-frequency signals change very quickly and have abrupt changes; low-frequency signals change slowly and the waveform is smooth.

2. The power supply and the signal are different. The voltage provided by the power supply board is generally 0 (DC power supply) or 50 Hz (AC power supply). The signal can be said to be high frequency or low frequency (or other frequency), the power board is not easy to say, because it is only used for power supply, the frequency is very low, must say only low frequency.

3, the benefits of high frequency inverters are mainly light weight, small size, standby power, high efficiency (relatively will save some). The disadvantage is that the impact resistance is not as good as the industrial frequency inverter (that is, you say low frequency), and it may not be able to bring food mixers, electric drills and the like. The drawback of low frequencies is that they are heavier and larger, and the prices may be slightly more expensive, and their losses will be slightly larger (a bit costly). The advantage is more sturdy, and the power of impact electrical appliances will be better.

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