原标题：Renesas V850E-Ix4太阳能逆变器解决方案

　　Renesas公司的V850E/Ix4和V850E/Ix4-H 32位全闪存微控制器是逆变器微控制器,能为太阳能提供更高的能源效率和更精细的控制.CPU工作频率100MHz,控制性能得以提升,其多功能定时器支持逆变器的控制,芯片内置了最大480KB的`闪存和24KB的RAM,内置了USB功能控制器以及外设电路如ADC,运放,转换器和POC/LVI等. 本文介绍了V850E/Ix4和V850E/Ix4-H MCU主要特性, V850E/Ix4 MCU方框图, 太阳能供电方框图以及单相三线和三相逆变器框图, 两片太阳能逆变器解决方案框图与太阳能逆变器系统框图.

　　The V850E/Ix4 and V850E/Ix4-H 32-bit All Flash microcontrollers are inverter microcontrollers that help to make products more energy efficient and enable fine-grained control.

　　Clean energy (such as solar and wind power) is getting a great deal of attention today. The performance of these microcontrollers shines in power conditioners for clean energy, green home air conditioners and washer/driers, and servos and other factory automation.

　　A faster CPU and high-capacity built-in Flash memory enable high-performance inverter control. It is also possible to install a real-time OS, facilitating distributed software development and making it possible to shorten development cycles.

　　The products also have a wealth of built-in peripheral functions, eliminating the need for external USB controls, analog components, and the like. This helps greatly to reduce the number of components in the system and reduce costs, improving market competitiveness.

　　V850E/Ix4和V850E/Ix4-H主要特性:

　　Control performance is improved via fast operation at a CPU operating frequency of 100 MHz

　　Onboard multifunctional timer supports inverter control

　　High-capacity Flash memory (max 480 KB)/RAM (24 KB) built in

　　Built-in USB function controller and external bus interface (V850E/Ix4-H)

　　Built in analyze peripheral circuit components, including A/D converter, operational amp. Converter, and POC/LVI

　　图1.V850E/Ix4 MCU方框图

　　Solar power is truly a free source of energy which requires only the means of capturing, storing and smart distribution without the pollution associated with conventional sources such as burning fossil fuels, or the potential hazards of nuclear power. It is estimated that up to 30% of the conventional nergy produced in the world is lost during power transmission over long distance, power conversion and oversupply. The use of locally distributed systems such as solar or wind can overcome most of these losses. It is estimated that the energy delivered to the earth by the sun every day can power our homes and businesses for almost 30 years. Although the energy is free, the technology to capture it and make it available for everyone comes at a cost that is becoming more and more competitive. Funded by private or public money, small start-ups and large energy providers and distributors work effortlessly to develop new materials and more efficient ways to bring down the cost and make it available to a larger customer base. Scalability from small to big, from simple to complex makes solar power one of the most attractive sources of alternative energy. Not only large energy companies but also home owners can benefit from this fast growing industry.

　　This application note provides a guide to designing solar power inverters with NEC Electronics’ 8-bit, 16-bit and 32-bit microcontrollers (MCUs).

　　Solar power can be harvested in two ways: Produce electrical power directly from the sun light using photovoltaic solar panels as DC or AC source voltage, or use the heat produced by the sun to heat up steam to drive a turbine to produce electricity. The subject of this application note is focused on the first of the two which we will call for convenience the photovoltaic method.

　　One of the most important aspects of energy production from the sun is the availability of steady sun light throughout the day and year. Location of the plant is also very important as not all areas of the globe have enough sun light to justify the expense. Places in the USA like: California, Nevada and Arizona where the sun shines between 250 to 300 days a year, are ideal sites to set-up solar energy production. Even though there is plenty of sun light in these areas, to maintain a steady flow of electrical energy is a challenge. Although on darker days there is still some sun light, the electrical output is quite diminished. At night obviously there is no sun light at all. The first problem can be easily dealt with by storing the energy produced when the sun shines to compensate for darker days. For the second problem there is no solution. But since the peak demands are during the day to maximize energy production when sun light is available is crucial to justify the investment. For the above reasons obviously solar power can’t be a standalone source of energy, it has to be combined with other forms of production. On the other hand since it is considered free and the cleanest off all, the more we use it the less we need other forms that are polluting the environment and are becoming less and less available as well as more expensive to provide. Solar energy production is clearly the way of the future. We just need to make it cheaper and available to a larger consumer base.

　　图2.太阳能供电方框图

　　图3.连接电网的单相三线逆变器框图

　　图4.采用变压器连接电网的三相逆变器框图

　　图5.逆变器定器框图

　　图6.两片太阳能逆变器解决方案框图

　　图7.太阳能逆变器系统框图