What's the difference between AC inverter and DC inverter air conditioner?

      Household air conditioning is divided into fixed frequency and frequency conversion, the difference between the two lies in the control mode of compressor speed. Constant speed air conditioning compressor speed is fixed, not variable, this kind of air conditioning refrigeration (heat) output of cold (heat) is also fixed, not adjustable, so the temperature adjustment can only be adjusted by the compressor on or off.

      The compressor speed of frequency conversion air conditioner is not fixed and can be changed. The output cold (heat) quantity of refrigeration (heat) can also be adjusted. Therefore, the output cold quantity of air conditioner can be changed by changing the compressor speed. Frequency conversion air conditioning is divided into DC frequency conversion and AC frequency conversion, and their concepts and control methods are different. Next, we will analyze their advantages and disadvantages and differences one by one.

1、 Advantages and disadvantages of variable frequency air conditioner

1. Advantages of variable requency air conditioning

① Energy saving and power saving: due to the function of internal frequency converter, the compressor will not start frequently, and the starting current is also very small;

② Intelligent adjustment of room temperature: the compressor changes the speed intelligently according to the temperature change, so as to keep the room temperature at a constant value and make the human body feel more comfortable;

③ Low noise: compared with the constant frequency air conditioner, the noise is lower, which is caused by the unbalance of the compressor, and the frequent start-up noise of the compressor is higher than that of the constant frequency air conditioner;

④ Wide voltage operation: because the constant frequency air conditioner needs starting capacitor to start, the voltage should not be too low, but the variable frequency can realize soft start, which is not very strict on voltage input, especially suitable for rural areas with unstable voltage.

⑤ Fast cooling (heating): due to the special electronic expansion and throttling technology used in the frequency conversion air conditioner, and the high power operation when the temperature difference is large, the temperature rises or falls rapidly.

2. Disadvantages of variable frequency air conditioning

① Maintenance is difficult and expensive: because frequency conversion air conditioner has more frequency converters than ordinary air conditioner, and the circuit and structure are more complex, frequency conversion air conditioner is easy to break down. Although the production process has been improved, compared with constant frequency air conditioner, its failure probability is much higher, the price is higher, the maintenance is more expensive, and the maintenance cost is much higher. This is also where many refrigeration technicians make complaints about tucks.

② High price: due to the complexity and advantages of frequency conversion air conditioning, the price is about 1000 yuan more than ordinary air conditioning;

③ Other disadvantages: for example, it needs to be running all the time to reflect its energy saving and power saving characteristics.

2、 Difference between AC frequency conversion and DC frequency conversion

1. DC frequency conversion air conditioner

Working principle of DC frequency conversion air conditioner: convert 50 Hz AC power into DC power and send it to the main circuit of power module. The power module is also controlled by microcomputer. The difference is that the output of the module is DC power with variable voltage, and the compressor uses DC motor. Therefore, DC frequency conversion air conditioner can also be called full DC variable speed air conditioner.

The rotor of DC variable frequency compressor is made of rare earth permanent magnet material. Its working principle is: the rotating magnetic field produced by stator acts directly with the permanent magnetic field of rotor to realize the operation of compressor. The speed of the motor can be changed by changing the DC voltage sent to the motor. DC inverter air conditioner has no inverter link, which is more power-saving than AC inverter.

The efficiency of DC variable frequency compressor is 10% - 30% higher than that of AC variable frequency compressor, and the noise is 5 DB-10 dB lower. However, the cost of DC inverter air conditioning is higher than that of AC inverter air conditioning.

2. AC variable frequency air conditioner

The working principle of AC frequency conversion air conditioner: AC frequency conversion technology is a technology that changes the power frequency through the frequency converter, so as to change the speed of the compressor. The conversion from AC to DC is carried out through the frequency converter, and then the conversion from DC to AC is carried out through the frequency converter, so as to control the speed of the AC motor. The control of the inverter is to transmit the indoor temperature information to the microcomputer through the sensor, and output a certain frequency waveform to control the frequency of the inverter.

AC motor can be operated in high temperature, flammable environment, and do not need to clean the dirt of carbon brush regularly, but it is difficult to control the speed. AC motor is a rotating magnetic field movement, and the conductor does not move. Although the manufacture is relatively cheap, the starting performance and speed regulation performance of AC motor are poor.

The advantage of DC motor is that it is simpler in speed control, less power and quieter. The structure of DC motor is complex, the manufacture is difficult and the price is high. DC motor is the magnetic field does not move, the conductor moves in the magnetic field. Compared with AC, DC motor is more energy-saving and environment-friendly.

Full DC variable frequency air conditioning refers to the three core motors of air conditioning: variable frequency compressor motor, indoor fan motor and outdoor fan motor. They all use powerful DC motor. With the inherent advantages of DC motor and the organic combination of microcomputer technology, the air conditioning performance is further improved, the room temperature fluctuation is small, and the comfort is better, It is insensitive to the fluctuation of power supply voltage, and the cooling capacity varies from 35% to 117%.

3、 How to choose frequency conversion and fixed frequency?

The choice of frequency conversion or fixed frequency should be decided by itself. Frequency conversion can save electricity a lot of times, but for continuous work, if a period of time is less than 5 hours, and the month is not long, then its energy saving can not be reflected too much, it is not as good as constant frequency. If you pursue comfort, frequency conversion is the best choice.

If you don't use the air conditioner very frequently, you don't have to ask for comfort. At this time, you can consider fixed frequency, because the price is relatively cheap and the maintenance is easy. As for whether to choose a domestic brand or a Japanese brand, Xiaobian is still saying that, according to his own actual situation, it's good to have money to buy high-end brands and no money to buy domestic brands. After all, the price is much cheaper.