Power management circuit for miniature electromagnetic kinetic energy collector

Abstract

The invention discloses a power management circuit for a miniature electromagnetic kinetic energy collector. The power management circuit can be used for an electromagnetic kinetic energy collector comprising a coil array and having a high output voltage. The power management circuit includes a primary branch and a secondary branch. The primary branch is an energy storage branch powered by a majority of coils of the collector, and includes a rectifier module, a DC-DC conversion module, an energy storage module, and a discharge module. The secondary branch is a control branch independently powered by a minority of coils of the collector. In the primary branch, a Buck-Boost DC-DC converter is used for impedance matching of the collector. A signal generated by the secondary branch controls the on-off state of the DC-DC converter in the primary branch. The circuit provided by the invention is a completely autonomous power management circuit, is different from a general feedback closed-loopcircuit, has a unique dual-branch open-loop structure, has higher efficiency than a conventional standard energy collector circuit, and has an application value in the fields such as wireless sensingand implantable systems.

Description

technical field [0001] The invention relates to the fields of wireless sensing and clean energy, in particular to a high-efficiency power management circuit of a miniature electromagnetic kinetic energy collector with high voltage output, which can be applied to power supply for wireless sensor nodes and portable electronic products. Background technique [0002] With the development of science and technology and the progress of human society, the protection of the natural environment must also be considered while developing the economy. From the perspective of energy, the use of solar energy, thermal energy, wind energy, vibration energy, etc. in the environment is very environmentally friendly. Therefore, various forms of micro-environmental energy harvesters have gradually developed. The Internet of Things technology is a new generation of information technology with broad development prospects. The energy collected by the harvester can be applied to the field of the Inte...

AI Technical Summary

Problems solved by technology

Synchronized magnetic flux extraction circuit (synchronized magnetic flux extraction circuit, SMFE) uses the inductance of the coil to construct a Boost type DC-DC conversion circuit to achieve boosting, and controls the short-term closure of the switch at the current extreme value, so that the circuit can charge two times in one cycle. Second, but the switch control of this SMFE circuit has not yet achieved self-supply, and needs to be powered by an external power supply; the voltage doubler circuit uses a series of diodes and capacitors to boost the output voltage of the collector, and its circuit structure is relatively complicated. High power consumption, slow charging

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