In the hot summer, air conditioning has become one of the indispensable home appliances in people's daily life. Although there are many brands and models of air conditioners, they can be roughly divided into two categories: fixed frequency and frequency conversion. Today, let’s t

In the hot summer, air conditioners have become one of the indispensable home appliances in people's daily life. Although there are many brands and models of air conditioners, they can be roughly divided into two categories: fixed frequency and variable frequency . Today, let’s talk about the difference between fixed frequency air conditioners and variable frequency air conditioners? The upgrade of

frequency conversion technology in the Chinese air conditioning market has gone through three stages: AC frequency conversion, partial DC frequency conversion and full DC frequency conversion. Now we are in the stage of accelerating the full DC frequency conversion, and some developed countries have implemented this process as early as 2002. Let’s talk about what frequency converter air conditioner is.

1. The basic difference between frequency conversion and fixed frequency

1, compressor different

The compressor operating frequency of fixed-speed air conditioners is immutable. (50Hz)

The compressor operating frequency of the inverter air conditioner can be changed. (10Hz~140Hz)

2, controllers. Different

inverter air conditioners have controllers that are much more complex than fixed-speed air conditioners;

3, air conditioners have different output capabilities

3, inverter only has one capability output under the same operating conditions; the output capability of

inverter is a range.

4 and have different comforts

frequency inverter air conditioners are better than those of fixed-speed air conditioners; they can quickly refrigerate or heat, and at the same time, the temperature control of the room is more accurate, and the fluctuations are basically within 0.5℃.

5 and consume different power

From a long-term operation, frequency inverter air conditioners will save more than 30% of the power than ordinary air conditioners ; however, frequent turn-on/off frequency inverter air conditioners cannot save power.

6 and compressors have different working principles

Fixed frequency air conditioner compressor power supply is mains power, with fixed frequency and voltage values. 's domestic voltage is 220V/50Hz, so the fixed frequency compressor runs at a frequency of 50HZ. fixed frequency machine is directly shut down when the ambient temperature reaches the set temperature of the air conditioner; (The shutdown rule follows the -2+4 principle, that is, the cooling mode is 2 degrees below the set temperature, and the heating is 4 degrees above the set temperature) and then restart when the ambient temperature of the air conditioner exceeds the set temperature.

inverter air conditioner compressor power supply is the outdoor inverter module of the inverter. The frequency of the inverter can be adjusted by adjusting the frequency of the inverter. After the inverter air conditioner detects that the ambient temperature reaches the set temperature, the air conditioner first enters the frequency reduction mode, and enters a stable state when the ambient heat dissipation and the air conditioner refrigeration capacity balanced during the frequency reduction process; when the inverter air conditioner drops to the lowest operating frequency, the air conditioner will also be shut down.

2. Basic principles of frequency conversion controller

1. From the energy conversion, frequency conversion control can be divided into AC to AC frequency conversion and AC-DC-AC frequency conversion .

2. For the frequency conversion control of household appliances, whether it is AC frequency conversion or DC frequency conversion, the frequency conversion is achieved through the AC-DC-AC method.

3. AC-DC-AC implementation process: To obtain alternating current with adjustable frequency, firstly, rectify the 220V AC mains to DC , and then change from DC to adjustable frequency AC to complete the frequency conversion process.

3. Classification of frequency converter

1, AC frequency converter (BP): controls the speed of the compressor by changing the power supply frequency F of the AC compressor.

2 and DC frequency conversion air conditioners: Midea frequency conversion air conditioner is currently DC frequency conversion; from the perspective of the whole machine form, DC frequency conversion can be divided into full DC frequency conversion (BP3) and DC frequency conversion (BP2).

3, full DC frequency converter air conditioner (BP3): compressor and indoor and outdoor fans use DC brushless motor . DC frequency converter means that only the compressor uses DC brushless motor.

4. The origin of the name of DC frequency conversion: In household appliances, the most commonly used DC frequency conversion is a brushless DC motor. In order to distinguish this frequency conversion from AC frequency conversion, people are used to refer to frequency conversion appliances that use brushless DC motors as DC frequency conversion appliances.

and electronic expansion valve and fluorine-free air conditioner, DC frequency conversion is a conventional term, and this naming method is misleading; therefore, DC frequency conversion does not mean that the compressor is powered by DC power. Its conversion method is the same as AC frequency conversion, and it adopts the interchange-direct-interchange method. The voltage supplied to the compressor is still an AC signal.

4. Advantages of DC frequency converter

1. High operating efficiency;

2. Good compressor speed regulation performance;

3. Wide compressor speed range;

4. Compressor motor running . Torque .

5. Low operating noise of air conditioner;

6. High energy efficiency ratio of air conditioner (compared with AC).