CN203850927U - Environmental radio-frequency energy collector - Google Patents

Abstract

The utility model discloses an environmental radio-frequency energy collector, and the collector comprises an RF-DC conversion circuit, a boost chopper circuit, a voltage monitoring circuit, a resistor R1, and a resistor R2. An external storage capacitor is connected to a VCAP. The RF-DC conversion circuit enables wireless radio-frequency energy received by an antenna to be converted into direct-current energy and enables the direct-current energy to be stored in the external storage capacitor. The voltage monitoring circuit controls the boost chopper circuit. When a charging value reaches a high threshold value of the capacitor, the voltage increasing is carried out till an output voltage level is set, thereby enabling the voltage to be outputted. When the charge of the capacitor is reduced to a low threshold-voltage value, the voltage outputting is stopped, and a direct-current output voltage value VOUT is determined by the resistors R1 and R2. The collector provided by the utility model can effectively collect the excess energy in an environment, enables a low-power electronic element to work normally, helps building new no-battery equipment, and enables a wireless radio wave in a conventional environment to become unique micro energy which can be widely used.

Description

A kind of environment radio-frequency (RF) energy gatherer

Technical field

The utility model relates to mobile charging equipment technical field, relates more specifically to a kind of rf wireless signal energy harvester of realizing.

Background technology

Energy acquisition is a key technology that realizes the long-term non-maintaining work of low power dissipation electron device (as wireless senser).By the excess energy in capturing ambient (as illumination, the temperature difference, vibration and radio wave (radio-frequency (RF) energy)), can allow low power dissipation electron device normally work completely.In these micropower energy, from the energy of radiofrequency launcher, there is unique advantage, comprise with measurable with the consistent power of change of distance, thereby allow energy collecting device away from the constraint of the energy.

Nowadays environment radio-frequency (RF) energy can obtain by billions of wireless launchers from the whole world, comprises mobile phone, hand-held radio equipment, mobile base station and TV/radio broadcasting platform etc.The ability of catching this class energy contributes to create new for battery apparatus, and allows battery supply set to realize trickle charge by wireless mode.

Radio wave quantity in environment is very huge, and particularly in thickly populated city, and frequency range is increasing, and power level is more and more higher.If this free-pouring radio-frequency (RF) energy can effectively and efficiently be gathered, these radio waves just can become a kind of uniqueness and widely available micro-energy so.The ever-increasing wireless launcher of quantity will cause radio frequency power density and availability day by day to improve.Special power reflector will further make to realize, predictable radio source solution becomes possibility.

The quantity of transmitting set, especially for the constantly increase of reflector quantity of mobile base station and mobile phone.According to estimates, to have surpassed in the recent period that 5,000,000,000, ITU estimates wherein to have mostly 1,000,000,000 be mobile broadband user to mobile phone user quantity.In addition also has numerous Wi-Fi routers and such as wireless terminal devices such as notebook computers.In some urban environments, hundreds of Wi-Fi access points likely detected.In short-range, in same room, the typical Wi-Fi router that can be 50mW to 100mW from transmitting power, collect small energy.The in the situation that of longer distance, needing use to have the more more vast of heaven line of high-gain could actual collection arrive the radio-frequency (RF) energy from mobile base station and radio broadcasting tower.

Utility model content

1, the purpose of this utility model.

The utility model is based on a large amount of urgent demand to radio frequency collection of energy in existing technology, and proposed a kind of radio-frequency (RF) energy gatherer of realizing to address the above problem.

2, the technical scheme that the utility model adopts.

An environment radio-frequency (RF) energy gatherer, comprises RF-DC change-over circuit, boost chopper, voltage monitoring circuit, resistance R 1, resistance R 2, and exterior storage electric capacity is connected to V _cAP, wherein RF-DC change-over circuit by antenna reception to radio frequency energy be converted to DC energy, and be stored in exterior storage electric capacity; Voltage monitoring circuit is controlled boost chopper, when charging reaches the high threshold of capacitor, boosts to setting output-voltage levels, makes direct voltage output; Electric charge on capacitor drops to the Voltage-output of low threshold voltage closes, the direct voltage output V of boost chopper _oUTby exporting after resistance R 1 and R2 ground connection.

3, the beneficial effects of the utility model.

(1) the effective excess energy in capturing ambient of the utility model, allows low power dissipation electron device normally work.

(2) the utility model can contribute to create new for battery apparatus.

(3) the utility model makes the radio wave in existing environment just can become a kind of uniqueness and widely available micro-energy.

Accompanying drawing explanation

Fig. 1 is circuit diagram of the present utility model.

Embodiment

Embodiment 1

As shown in Figure 1, a kind of environment radio-frequency (RF) energy gatherer, comprises RF-DC change-over circuit, boost chopper, voltage monitoring circuit, resistance R 1, resistance R 2, and exterior storage electric capacity is connected to V _cAP, wherein RF-DC change-over circuit by antenna reception to radio frequency energy be converted to DC energy, and be stored in exterior storage electric capacity; Voltage monitoring circuit is controlled boost chopper, when charging reaches the high threshold of capacitor, boosts to setting output-voltage levels, makes Voltage-output; Electric charge on capacitor drops to the Voltage-output of low threshold voltage closes, VD value V _oUTby resistance R 1 and R2, determined.The capacitance of described electric capacity is by output voltage V _oUTdetermine pin, capacitance is less than 1 μ A at 1.2V, and electric capacity ESR value is less than 200m Ω.The position of minimum capacitance of described electric capacity can be estimated with formula below:

C＝15V _outI _outT _on

V _outoutput voltage, I _outaverage output current, T _onit is the operating time

Embodiment 2

An environment radio-frequency (RF) energy gatherer, comprises RF-DC change-over circuit, boost chopper, voltage monitoring circuit, resistance R 1, resistance R 2, and exterior storage electric capacity is connected to V _cAP, wherein RF-DC change-over circuit by antenna reception to radio frequency energy be converted to DC energy, and be stored in CSET; Voltage monitoring circuit is controlled boost chopper, when charging reaches the high threshold of capacitor, boosts to setting output-voltage levels, makes Voltage-output; Electric charge on capacitor drops to the Voltage-output of low threshold voltage closes, VD value V _oUTby resistance R 1 and R2, determined the relational expression of VD value and R1 and R2:

$R2=\frac{R1}{(\frac{V_{\mathrm{out}}}{1.108}-1)}$

When R1=1M Ω, the value of R2:

For V _oUT=3.3V, R2=505.5k Ω

For V _oUT=4.1V, R2=370.3k Ω

For V _oUT=4.2V, R2=358.3k Ω

Above-described embodiment limits the utility model never in any form, and every employing is equal to replaces or technical scheme that the mode of equivalent transformation obtains all drops in protection range of the present utility model.

Claims (2)

1. an environment radio-frequency (RF) energy gatherer, is characterized in that: comprise RF-DC change-over circuit, boost chopper, voltage monitoring circuit, resistance R 1, resistance R 2, exterior storage electric capacity is connected to V _cAP, wherein RF-DC change-over circuit by antenna reception to radio frequency energy be converted to DC energy, and be stored in exterior storage electric capacity; Voltage monitoring circuit is controlled boost chopper, when charging reaches the high threshold of capacitor, boosts to setting output-voltage levels, makes direct voltage output; Electric charge on capacitor drops to the Voltage-output of low threshold voltage closes, and the direct voltage output of boost chopper is exported after by resistance R 1 and R2 ground connection.

2. environment radio-frequency (RF) energy gatherer according to claim 1, is characterized in that: the capacitance of described electric capacity is by output voltage V _oUTdetermine pin, capacitance is less than 1 μ A at 1.2V, and electric capacity ESR value is less than 200m Ω.