Frequency conversion technology in the field of home appliances is widely used in recent years in the field of air conditioning is particularly prominent. In 2012, among the mainstream brands in the air conditioner market, the sales ratio of inverter models reached about 40%. The sales ratio of individual brands of frequency conversion concept and frequency conversion air conditioners was even more staggering.
Despite the heavy volume of the market, with the gradual increase of the technical requirements for frequency conversion in the whole plant, the inverter controller plant is not without any peace of mind. It seeks technological breakthroughs in the areas of higher efficiency, lower production cost and introduction of humanized design so that the supporting enterprises rack their brains .
Demand for energy efficiency is still pressing
In the national policy to promote and the joint efforts of air-conditioning industry, air-conditioning energy efficiency in recent years continue to improve, especially inverter air conditioner, compared with the fixed-speed air-conditioning already have significant energy efficiency. Even so, air-conditioning plant is also increasing technology research and development, explore the potential to improve energy efficiency inverter air conditioner. In this regard, Ningbo German industry frequency conversion Technology Co., Ltd. sales person in charge of deep experience, he told reporters: "Air conditioning inverter controller is the main business of the German industry frequency, production and sales increased significantly in 2012 in the field of air conditioning, frequency conversion already A recognized trend of development, Gree, the United States, Haier, Oaks, Chi high brand inverter air conditioner sales ratio year after year large, the inverter controller to improve energy efficiency requirements of the machine is also higher and higher. "It is understood that, German industry is one of the few frequency control sine wave 180 ° DC inverter technology manufacturers.
"In order to further improve the energy efficiency of the whole machine, some OEMs increased the frequency conversion controller equipped with air conditioners to three groups. The indoor machine fans, outdoor machine fans and compressors all adopt frequency conversion control. In the past, the whole factory often only Outdoor fans and compressors set the inverter control.Only this one, the demand for air conditioning machine inverter controller will increase a lot. "An industry source. In the meantime, after many years of market cultivation, it is no accident that the inverter air conditioner market rapidly grew in 2012. "Throughout the appliance industry, air-conditioning 整机 plant in the promotion of frequency conversion technology to start the earliest, most investment, market growth is a matter sooner or later .In 2013, inverter air conditioner popularization trend will continue to promote the common development of the upstream and downstream industry chain, The purchase of inverter controller will also continue to increase. "
Improve program design
Improve overall performance is the key
In addition to improving energy efficiency, in terms of performance, the entire plant also made more detailed requirements on the inverter controller. Low vibration, electromagnetic interference is small, the feedback is more secure and reliable are all machine companies choose frequency control program is particularly concerned about. It is understood that the core technology of air conditioning inverter is divided into two parts - motor-driven algorithms and application algorithms. In simple terms, the motor-driven algorithm to plan how efficient air-conditioning operation, the application algorithm is to adjust air-conditioning to achieve some specific functions. In 2012, the frequency conversion controller and the manufacturers of variable frequency components have made positive technical exploration in both aspects, and strive to improve the overall performance.
Liu Tao, director of vertical market general manager of Renesas Electronics introduced in 2012, for sensorless 180 ° sine wave vector control, Renesas has developed a fully independent intellectual property λ algorithm motor control solutions, the motor control and single-phase AC power factor correction technology into one, with the framework of the program for the user to develop the overall system to provide a solid foundation and user-friendly interface. Take the outdoor air conditioner unit as an example. Based on Renesas' RX high-performance microcontroller, the whole machine manufacturer can build an outdoor single-chip solution with high-quality, high-performance motor drive and power factor correction.
According to reports, Fujitsu Semiconductor 180 ° DC inverter air conditioner program is based on 32-bit Fujitsu ARMCortex-M3 (FM3) series chip design. FM3 is in line with the characteristics of inverter motor control, with Flash technology to ensure 20 years of data storage and 100,000 times data erase; up to 144MHz operating frequency to provide better microcontroller performance; wide power supply operating voltage compatible with more applications; Optimized hardware peripherals are better suited for motor control and other features. The core control algorithm of this solution adopts the space magnetic field oriented frequency conversion control scheme to control the motor to start up quickly and stably and realize the motor driving frequency of 1Hz ~ 400Hz under the condition of 5kHz carrier frequency, which can achieve perfection at high frequency and low frequency Smooth sine wave control.
In the development of new products, International Rectifier (hereinafter referred to as IR) is considering how to make the frequency conversion program more concentrated. Li Ming, director of the Xi'an Application Center of the company, said: "The inverter control scheme involves power factor correction in addition to the motor drive. In the past, the power speed correction was independent and the IR considered integrating the power factor into the power module. In this way, the entire frequency conversion control The system is more efficient and smaller. "
Taking into account the needs of human design
Based on the goal of creating a more comfortable living environment for people, supporting the air conditioner factory, inverter controller factory must take into account the inverter control program can make air conditioning to achieve what functions can give consumers what kind of experience to be Frequency conversion program fully reflects the concept of human design.
IR products are widely used in the field of air conditioning manufacturing. In 2012, the whole plant proposed the design requirements for IR control scheme with low speed to IR, hoping to achieve the lowest power 0.1Hz of the whole machine. In fact, it is more difficult to realize the low speed control of permanent magnet motor. In addition, air-conditioners are single-rotor and vibrate at low speed. To this end, IR developed a new algorithm to meet the requirements of complete machine. Li Ming said: "In the process of cooperation with the whole plant, IR will analyze the technical requirements of the whole plant, such as low-speed frequency control requirements put forward by the whole plant, reflected in the function of the whole machine is a smaller amount of refrigeration, heating On the one hand, the air conditioner can operate in a more energy efficient mode at night or in the room, on the other hand, air conditioning cooling and heating air supply can be more gentle and comfortable from the perspective of human comfort. These, IR design program will be in technical indicators and application effects are as close as possible to the whole plant requirements.
In addition, in order to improve the integration of air-conditioning control system, inverter controller in the completion of the task of variable frequency speed control but also to achieve other functions of air-conditioning control components to focus on the design of the inverter controller plant requirements even higher . German industry frequency of air-conditioning on the various functions have a deep understanding of the design and production process in the frequency controller to fully join the humane design. Regardless of sleep, a key 26 ℃, timer switch machine and other functions to achieve, or remote control, status display, or even the outlet of the swing mode, the German industry inverter controller will choose the most appropriate way to issue instructions to control air-conditioning action.