L-type impedance matching system and method in a radio frequency energy harvesting circuit

A technology for collecting circuits and RF energy, applied in impedance networks, electrical components, multi-terminal-to-network, etc., to solve problems such as inability to apply weak energy collection systems, high power consumption, and insufficient control of relays

CN107154788BActive Publication Date: 2020-07-07XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-07-07

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Abstract

The invention relates to an L-type impedance matching system of a radio frequency energy acquisition circuit and a method thereof. The system comprise a sampling comparison module, a logic algorithm control module and an adjustable impedance matching network, wherein the sampling comparison module is used for carrying out continuous two-times sampling of voltages outputted by a voltage doubling rectifying circuit under the control of a logic control module and comparing the continuous two-times sampling voltages, the logic algorithm control module is used for gradually adjusting the quantity of L-type adjustable capacitance arrays merged to the adjustable impedance matching network according to the comparison result of the continuous two-times sampling voltages, and the adjustable impedance matching network is used for matching impedance between an antenna and the voltage doubling rectifying circuit according to the quantity of the merged L-type adjustable capacitance arrays. The system is advantaged in that the present impedance matching effect is acquired through determining the output voltages of the voltage doubling rectifying circuit, a complex ADC sampling or signal processing unit can be omitted, the circuit is simple, power consumption is quite low, energy is only consumed during the switching process, and the system is suitable for the weak energy acquisition environment.
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Description

technical field

[0001] The invention relates to an impedance matching system and method in an energy collection circuit, in particular to an L-shaped impedance matching system and method in a radio frequency energy collection circuit. Background technique

[0002] Due to the vigorous development of wireless sensor network (WSN), body area network (BAN), and Internet of Things (IoT), wireless sensor nodes have been widely utilized. In order to achieve uninterrupted measurement, the sensor node needs to have a longer standby time, but its service life is limited by the bottleneck of battery technology. In order to solve the power supply problem of sensor nodes, wireless energy harvesting technology has been widely developed, which collects radio energy to provide power for sensor nodes, so as to achieve the purpose of prolonging the working time of the circuit or passive work.

[0003] Energy harvesting circuits generally consist of four parts, such as figure 1 As shown, the...

Examples

Embodiment Construction

[0068] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0069] Such as Figure 5 As shown, an L-shaped impedance matching system in a radio frequency energy harvesting circuit: wherein, the radio frequency energy harvesting circuit includes an antenna for receiving radio frequency signals, and a voltage doubler for rectifying and boosting the radio frequency signals received by the antenna Rectifier circuit; the system of the present invention includes a sampling comparison module, a logic algorithm control module and an adjustable impedance matching network, and the adjustable impedance matching network includes an L-type adjustable capacitor array; the sampling comparison module is used for Under the control of the logic control module, the voltage output by the voltag...