China’s “double carbon” strategy advocates a green, environmentally friendly and low-carbon lifestyle, which depends on the continuous development and innovation of green energy technology. At present, when China vigorously develops renewable energy, the recycling of micro-energy in the real environment such as magnetic energy has attracted the attention of many researchers.

22810-01-05-50-02 Chu Zhaoqiang, a young teacher and associate professor in the “Marine Magnetic Sensor and Detection” team of the School of Underwater Acoustic Engineering of Harbin Engineering University and the innovation and development base, researched and designed a new type of weak magnetic energy collector structure, which can avoid various manual and cumbersome operations such as replacing and repairing batteries of iot sensors, and achieve “self-electricity” under weak magnetic conditions. Its output power is about 120% higher than that of conventional magnetic energy collection structures. Recently, the research academic paper “Significantly Enhanced weak magnetic energy recovery performance in two end clamped magnetic-force-electric energy harvesting devices” was published online in Advanced Energy Materials, an internationally renowned journal in the field of energy materials.

Recycle microenergy from the environment

The “Internet of Everything” is an important engine for creating a smart world, and it has also spawned the rapid development of Internet of Things technology. At present, a major challenge in the development of the Internet of Things is to find the self-energy technology of sensor 22810-01-05-50-02 communication nodes to support the construction of large-scale, distributed sensor networks.

In response to this technical challenge, many fields in our country are actively planning to crack the way. The National key research and development plan “Smart Sensor” in 2021 focuses on the problem of self-energy supply of human multi-parameter biosensors in the wireless scene, and proposes to study the self-energy supply technology of obtaining energy from the human body; The key project of the National Key Research and Development Plan “Smart Sensor” in 2022 is aimed at the problem of energy supply and network access of distributed sensors in the state of distribution power network, and the project guide of magnetoelectric coupling self-supplying magnetic field sensitive elements and sensors is proposed. In 2022, the National Natural Science Foundation will also study the micro-piezoelectric vibration energy capture technology for aerospace into the scope of the guideline.

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It can be said that the development of distributed energy acquisition technology to achieve the recycling of micro-energy in the environment is of great value, and it is also an effective measure to respond to the national energy conservation and emission reduction strategy and help carbon peak.

For the recycling of environmental micro-energy, in the vibration energy, radiation energy and near-field electromagnetic energy and many other recoverable energy, power cables, industrial machinery and household appliances generated stray magnetic energy due to its fixed frequency and wide distribution, than wind energy and other low-frequency energy acquisition efficiency, has been the attention of researchers. Especially in the context of the construction of smart grid, on-line monitoring and fault diagnosis of transmission line status parameters urgently need to capture energy from overhead cables and build sustainable self-supply sensing networks.

Just like the beautiful new world described in the novel “The Three-body Problem”, the cup does not need power supply, batteries, can self-heating, the flying car in the air does not use batteries, but can fly non-stop, never without electricity, all because the power supply uses microwave or other forms of electromagnetic shock to generate electricity and form a wireless power supply field. This technology is actually used for wireless charging of mobile phones. Initially, people also turned their attention to this traditional coil type induction power collection device. However, this technology has some outstanding problems such as large volume, inconvenient installation and difficult to withstand short-time large current impact.

Therefore, people began to study an energy capture device from magnetic energy into mechanical energy and then into electrical energy (MME), this technology is expected to become a new choice for the next generation of low-frequency magnetic field energy harvesting.

Chu Zhaoqiang introduced that this new type of energy capture device is the use of magnetic torque effect and hysteresis effect, and then the piezoelectric effect to achieve the conversion between mechanical energy and electrical energy, its advantage is that it does not need to close the magnetic circuit required by the coil induction device, and can achieve higher efficiency of energy conversion and higher tolerance to strong current pulses.