Inverter air conditioner controller with emphasis on energy saving characteristics

At present, the development of energy-saving home appliances has become the focus of attention worldwide. In the situation of calling for energy conservation, frequency conversion technology has become a hot spot of concern. It is widely used in home appliances such as air conditioners, refrigerators, washing machines, etc., taking air conditioners as an example, air conditioners. The energy-saving technology of the device can be divided into three types: one is the application of energy-saving components and energy-saving technology; the second is to improve the design of the air conditioner, optimize the structural parameters and system parameters; the third is the energy-saving control in operation, that is, the variable capacity control technology is adopted. Especially the frequency conversion technology. Since the frequency conversion technology adjusts the compressor power by changing the frequency, the inverter air conditioner reduces the frequent starting loss on the one hand, and the efficiency at the low frequency operation on the other hand. Experiments prove that no matter how many improvements are made in the compression-type fixed-speed air-conditioning system, the frequency conversion technology can achieve more than 30% energy saving. Therefore, frequency conversion becomes the best energy-saving technical solution.

According to the survey, DC inverter air conditioners are more popular than consumers because of their more energy-saving and energy-saving than ordinary AC inverter air conditioners. In 2005, China's inverter air conditioner market share is expected to exceed 30%, of which DC inverter air conditioner will account for 53% of the total frequency conversion air conditioner market; from June 1 this year, Shanghai took the lead in implementing the local standard "variable frequency (frequency conversion) room) Air conditioner energy efficiency limit value and energy efficiency grade", inverter air conditioners with energy efficiency lower than 5 and energy efficiency ratio less than 3.30 will not be produced or sold. Inverter air conditioners, especially the DC inverter air conditioner market, have rapidly warmed up and become the focus of competition among various air conditioner giants.

Fujitsu Microelectronics was the first to be in China has introduced MB89P857 for AC frequency conversion, especially AC inverter air conditioner. After that, MB90460/MB90560 for AC and DC frequency conversion and MB90820 series for inverter washing machine have been developed. In the last two years, we have devoted ourselves to the most advanced sine wave (180 degree) frequency conversion. Product development and application. Has launched: MB91260, MB91265 and MB91470 series products.

The MB91265 uses the 32-bit RISC CPU core of the FR60Lite family. The product includes a high-speed MAC macro, multi-function timers with different timers and waveform generator circuits, A/D converters and other configuration resources, making them ideal for variable frequency motor control applications. The new series is available in a 64-pin LQFP (thin flat square) package.

Product Features

â—† The configuration of this product is similar to that of the MB91260 series, but the configuration resources have been strengthened in the following aspects.

(1) The number of free-running timers has been increased in the multi-function timer (from one unit to three units). This configuration upgrade ensures that different timers generate separate carrier frequencies for each phase of the three-phase inverter control, making the new product a more flexible and accurate engine control than the MB91260 series.
(2) It is equipped with a timing generator to control the timing activation of the programmable pulse generator (PPG). In the MB91260 series, the programmable pulse generator (PPG) timers are set to be individually enabled for each channel by software. In the MB91265 series, multiple PPG timers can be started simultaneously with the timing generator.
(3) Built-in dual mode flash memory. The new line of products includes dual-mode flash memory. When the program is running in one sector, the rewriting can be done in another sector. This reduces the number of external memory components (including EEPROM), which can reduce the board area.

Variable frequency control using multi-function timer macro

This product uses a multi-function timer macro, so it can generate triangular modulated waves used in most general-purpose inverters. Figure 1 shows the waveform output required to generate a triangular modulated wave (bilateral modulation) pulse width modulation using a triangular wave as the carrier.

application

This product has many advanced features of the FR60Lite series CPU, with a variety of timers, multi-channel high-speed A / D converter and 5V I / O. With the support of these functions, this product can be used for a variety of purposes, including not only frequency-related products (such as refrigerators, washing machines and air conditioners), but also printer engines, car audio products, electronic products, electric marble products, coin machines. and many more. There is also a special evaluation board for real-time debugging.

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