Microenergy harvesting is not a completely new concept, but it seems to have not been truly widely used. Micro-energy harvesting is the conversion of electricity, light, heat, force and other forms of energy into the environment, and it is used to power micro-low-power electronic systems or devices (such as mobile phones). ), which greatly extends the life of electronic products. For micro-energy harvesting, it has not been widely used. Mr. Zhang Songgang, Asia-Pacific marketing manager of Analog Devices' Industrial and Energy Division, believes that the biggest reason may be: "You can't understand in depth that the energy harvesting system is a comprehensive system that needs to be combined. Various factors can be used to design a truly productized product. Many of the chips or solutions that are currently seen can only partially implement energy harvesting functions without considering the factors of real product design." Zhang Songgang, Asia Pacific Marketing Manager, Industrial and Energy Division, Analog Devices How to manage and apply micro energy? Mr. Zhang Songgang believes: “There must be a large number of them to collect and manage them. This also involves energy storage and reducing leakage current. It requires a storage device that can store continuously and has very low leakage current. Far less than the collected energy, these collected energy may be used; once the collected energy is centrally managed, it can be used to drive some transient or pulsed loads; for those that work continuously Involved in another problem, low-power and ultra-low-power devices, only the operating loss of these ultra-low-power devices is balanced with the collected energy and the management of these energy, micro-energy acquisition can be truly widely used. The energy collected is very weak, and the threshold of energy collection must be very low. The storage of energy is also very important. At present, more people use rechargeable batteries or super capacitors, how to increase the number of times the battery is charged, and extend the life of the battery. Reducing the leakage of supercapacitors is a key issue to be solved." Because the energy to be processed is only microwatt (μW) level, and involves a lot of related hardware and software. In the design of the energy harvesting system, Mr. Zhang Songgang mentioned some factors that engineers should consider: “The first thing to consider is to choose ultra-low power devices to ensure that the overall static power consumption is relatively low. The energy storage device should choose a small leakage current. Secondly, the topological structure and efficiency of the circuit, the energy circuit should be operated at the maximum power point or within the interval, the maximum efficiency of the energy storage device, these are the focus on the hardware; in software Mainly pay attention to the frequency of energy use and the choice of protocol. Most energy harvesting systems use short-range wireless transmission and reception. Choosing the right wireless transmission protocol is a key factor for engineers to consider, and accurately calculate the frequency and frequency of transmission and reception. Factors such as energy consumption and average energy consumption for each transmission and reception; finally, all factors should be integrated from the system level, and factors such as energy allocation, multi-power management, system startup time, safety protection, and fault handling should be reasonably arranged." Speaking of the development of energy harvesting in China, Mr. Zhang Songgang believes: "As the concept of Internet of Things is more and more accepted by everyone, the development of smart sensors is also entering the fast lane. The development of energy harvesting in the Chinese market should be better. The factors include the development and investment of the Internet of Things, industrial 2025, energy conservation and environmental protection, and the promotion of new technologies and new devices. The R&D investment of many large enterprises is also a favorable factor. However, there are also some unfavorable factors, like Insufficient standards, lack of systematic and in-depth research and development of new energy-receiving technologies, including topology, and insufficient energy harvesting chips; and wireless short-distance communication, which is more relevant to energy harvesting applications, has many different communication protocols. Uniform, there are some gaps between the types and capacities of energy storage devices and the final application requirements, which are also unfavorable factors affecting market development."
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