A radio frequency energy harvesting system and control method

Abstract

The invention discloses a radio frequency energy collection system and a control method, wherein the radio frequency energy collection system includes a radio frequency antenna, a control circuit, a matching boost network, an RF-DC rectifier, a self-starting circuit, a hysteresis voltage comparator, a V DD terminal energy storage unit, V L End energy storage unit, switch S L , voltage detection circuit, V ST A terminal backup energy storage unit, a first energy conversion circuit, a second energy conversion circuit, an LDO voltage regulator circuit, a reference current source and a reference voltage generation circuit. The invention improves the structure of the existing circuit, optimizes the performance and innovates the structure of each circuit module, improves the sensitivity of the whole collection system, and can manage the stored energy at the same time. In addition, the invention has the characteristics of low power consumption, complete automation, and low voltage ripple.

Description

technical field [0001] The invention relates to a radio frequency energy collection system and a control method, in particular to a radio frequency energy collection system capable of managing stored energy, which belongs to the technical field of micro energy collection. Background technique [0002] At present, more and more wireless sensor network nodes are applied in real life, and the main energy supply of these devices is battery. However, battery-powered sensing limits the lifetime of the sensor, and periodic battery replacements are expensive. And nature is full of a lot of environmental energy, such as vibration energy, wind energy, solar energy, heat energy and radio frequency energy, etc., so the energy in the environment can be converted into sustainable electrical energy. Among them, radio frequency energy is a widely existing form of energy, and it is hardly affected by environmental changes. Therefore, collecting radio frequency energy has great significance ...

AI Technical Summary

Problems solved by technology

However, this structure has two disadvantages: first, the voltage ripple at the end of the energy storage unit is very large, and it will definitely affect the performance of the circuit when it is directly used as the power supply of the load circuit; second, when there is abundant radio frequency energy in the environment , the energy in the load circuit can only be stored and used now, and the excessive energy is not stored in time by other energy storage units, which makes the collected DC energy too wasteful

Images