A radio frequency energy harvesting system and control method

A technology for collecting system and radio frequency energy, which is applied in the direction of electric energy storage system, control/regulation system, and regulation of electric variables, etc. It can solve the problems of large voltage ripple at the end of the energy storage unit, waste of DC energy, and influence on circuit performance, etc.

CN109149788BActive Publication Date: 2021-03-19NANJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-03-19

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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.
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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 ...

Examples

Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as figure 2 As shown, the radio frequency antenna converts the radio frequency energy in the environment into alternating current V RF Input into the matching boost network, the matching boost network will input a lower magnitude of V RF converted to a higher amplitude AC V M , the RF-DC rectifier will receive the alternating current V M converted into higher DC energy, and the output voltage V R , if the system supply voltage V DD Below 0.95V, the output DC energy of the RF-DC rectifier will pass through the self-starting circuit to V DD The energy storage unit at the terminal is charged so that the voltage V DD increases continuously, once the supply voltage V DD If it is higher than 1.02V, the self-starting circuit will be turned off, the system will enter the RF energy extraction mode, and the control circuit will turn on the V L end of the swi...