COMPRESSOR DIFFERENCE: Constant speed compressor operating frequency can not be changed. E. G. The operating frequency of the compressor of 50Hz variable frequency air conditioner can be changed. E. G. 30 hz ~ 120 hz Controller Difference: The controller of variable frequency air conditioning is much more complex than the constant speed air conditioning 3 Output Capability Difference: In some cases, the converter only has one output capability in the range 4 COMFORT DIFFERENCE: Frequency Conversion Air conditioning than the comfort of fixed speed air conditioning better, can quickly cooling and heating. Small Change in temperature. FREQUENCY CONVERSION AIR CONDITIONING PRINCIPLE: from the energy conversion can be divided into AC inverter and AC → DC → AC inverter control. The inverter control of home appliance equipment, whether AC inverter or DC inverter, is realized by AC → DC → AC inverter operation. To obtain adjustable frequency AC power, the 220V-240V AC power supply is first rectified to DC, and then from DC to adjustable frequency AC to complete the frequency conversion process. DC FREQUENCY CONVERSION AIR CONDITIONING PRINCIPLE: from the overall form, DC frequency conversion is divided into full DC frequency conversion and part of DC frequency conversion. Full DC INVERTER is the compressor, indoor and outdoor fans use brushless DC electric motor, some DC means only the use of compressor brushless DC electric motor. The origin of the name of DC converter, in home appliances equipment, DC converter is the most commonly used brushless DC motor, in order to distinguish between this converter and AC converter, the general use of brushless DC motor inverter home appliances known as DC inverter home appliances. As with electronic expansion valve and fluorine-free air conditioning, DC converter is a common language, this naming method is misunderstood. Therefore, the DC inverter is not a compressor for DC power, its conversion method and the same as the AC inverter, using orthogonal mode. The working voltage supplied to the compressor is the communication data signal. This kind of motor is actually an alternating current motor. Brushless DC motor and brush DC motor: The basic structure of a DC inverter motor, which replaces the stator magnetic pole with a permanent magnet, the armature with a stator with a multiphase winding, and the mechanical commutator and brush formerly used to be replaced by an electronic commutator consisting of a position sensor and a controller. Thus, the DC motor is obtained. The structure and speed control performance of the DC motor motor are similar to those of the DC motor motor, so it has become a habit to call the motor the DC motor motor. When the brushless DC motor is in operation, it is necessary to check the position of the rotor, the rotation position of the drive motor, and carry out proper driving operation to ensure the smooth operation of the motor. In order to keep the position check of DC motor with brush motor, in general, the way of using the data signal which comes from the position sensor inside the motor is generally the Houle element, and the second way is to check the position working voltage of DC motor with brush motor, and use the sampling data signal of position working voltage to carry out and calculate. INVERTER module is an important equipment to realize compressor operation from DC to AC, also known as intelligent power module (IPM) . This is an intelligent power module, which package 6 IGBT pipes, its drive circuit and protection circuit, simplify the design and improve the reliability of the whole system. From the drive circuit used by the number of power into a single power supply and four power supply. Main manufacturers: Mitsubishi, Sanyo, Toshiba and so on. Outdoor main chip: the Core Algorithm and the outdoor control are accomplished by outdoor chip. At present, the American Titanium Company's digital signal processor chip has been used in communication, and has realized the shield. DSP (digital signal processor) is the abbreviation of digital signal processor. Compared with General single-chip microcomputer, DSP has great advantages in operation speed, signal processing and motor control. DC converter is now in the development stage, using the U. S. AD DSP chip The advertised DSP chips are much faster to use, faster to sample the temperature, and the indoor temperature is controlled at 0.5 °C. Because the DSP's operation speed and temperature control has no direct relationship. RECTIFIER BRIDGE STACK: COMPLETES THE CONVERSION FROM AC to DC 220V AC to 310V DC outdoor electronic control box another rectifier bridge stack is not used for rectifier, but as a pair of diodes, working with the reactor to improve the overall power factor. Large reactors: outdoor controllers of variable frequency air conditioners usually have large reactors that are designed to improve the overall power factor and pass the high-order harmonic current test. In order to meet the 3C standard, through the harmonic current test, the separator uses two kinds of reactor passive power factor correction methods. Compared with the Japanese manufacturers'active approach, the cost is lower and the reliability is improved. An integrated filter element for testing interference power and interference voltage to pass an EMC test. Large DC smoothing capacitors: Electrolytic capacitors are used for DC power smoothing, depending on power, using 3 to 6560uf per set of controllers. DISCHARGE TUBE: In order to prevent outdoor lightning stroke, damage electronic control. OPTOCOUPLER: used to drive signals from chip to module transmission and isolation, but also for indoor and outdoor communications. A total of 9 optical couplers are used for the outdoor control panel. Protection measures: at the same time, in order to improve the reliability and rationality, adopted several overcurrent protection measures. As a first protection, electronic circuits are protected by rapid melting only in the case of a short circuit. The DC fast circuit breaker is set to protect after the electronic circuit is running, and the over-current relay is set to run when it is over-load. The overvoltage of the INVERTER is as follows: External overvoltage and internal overvoltage; external overvoltage: mainly from external factors such as lightning strike and system running process. Switching overvoltage: caused by switching operation; lightning overvoltage: caused by lightning strike; internal overvoltage: mainly from the switching process of the equipment inside the power electronic equipment; phase switching overvoltage: After the phase switching, the reverse current of the thyristor decreases sharply, and the line inductance generates overvoltage at both ends of the equipment. Turn off overvoltage: When the thyristor is turned off, the forward current drops rapidly and the line inductance produces overvoltage at both ends of the device.

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