CN112491166A - Wireless radio frequency power supply system and power supply method thereof - Google Patents
Wireless radio frequency power supply system and power supply method thereof Download PDFInfo
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- CN112491166A CN112491166A CN201910866482.1A CN201910866482A CN112491166A CN 112491166 A CN112491166 A CN 112491166A CN 201910866482 A CN201910866482 A CN 201910866482A CN 112491166 A CN112491166 A CN 112491166A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
Abstract
A wireless radio frequency power supply system and a power supply method thereof are provided, the system comprises: a rectifying unit, a first end of which is coupled with the antenna and is suitable for rectifying the output signal of the antenna, and a second end of which outputs a rectified signal; a first switch, a first terminal of which is coupled to a second terminal of the rectifying unit, and a second terminal of which is directly or indirectly coupled to a power supply output terminal; a second switch having a first terminal coupled to the second terminal of the rectifying unit; the input end of the energy storage unit is connected with the second end of the second switch; a first control unit adapted to control the first switch and the second switch or release the control of the first switch and the second switch; a second control unit adapted to control the first switch. The scheme of the invention can improve the voltage requirement of power supply and the power supply stability while realizing wireless power supply.
Description
Technical Field
The invention relates to the field of communication electronics, in particular to a wireless radio frequency power supply system and a power supply method thereof.
Background
In the prior art, various sensors can convert measured information into electric signals or other appropriate forms of information output according to a preset rule, thereby meeting the requirements of information transmission, processing, storage, display, recording, control and the like, being widely applied,
specifically, the existing sensors are mostly integrated in various chips, and are powered by batteries, and the traditional sensors are difficult to work in severe environments or for a long time due to the limitation of the service life and the high and low temperatures of the batteries. The existing scheme mostly adopts a wired power supply mode or frequently changes batteries, however, for various fields such as aerospace technology, military engineering, industrial automatic measurement, detection technology, medical diagnosis and the like, a working scene that the batteries are not suitable for limited power supply or battery change often exists, and the effective application of the sensor is seriously influenced.
Disclosure of Invention
The invention aims to provide a wireless radio frequency power supply system and a power supply method thereof, which can realize wireless power supply and effectively convert and store electromagnetic waves with unstable electric quantity so as to improve the voltage requirement of power supply and the power supply stability.
To solve the above technical problem, an embodiment of the present invention provides a wireless radio frequency power supply system, including: a rectifying unit, a first end of which is coupled with the antenna and is suitable for rectifying the output signal of the antenna, and a second end of which outputs a rectified signal; a first switch, a first terminal of which is coupled to a second terminal of the rectifying unit, and a second terminal of which is directly or indirectly coupled to a power supply output terminal; a second switch having a first terminal coupled to the second terminal of the rectifying unit; the input end of the energy storage unit is connected with the second end of the second switch, and the energy storage unit is suitable for storing energy of the received rectification signal to generate energy storage voltage; the first control unit is suitable for detecting the voltage of the rectification signal and controlling the first switch and the second switch according to the detection result or releasing the control of the first switch and the second switch; and the second control unit is suitable for detecting the energy storage voltage when the first control unit releases the control over the first switch and the second switch, and controlling the first switch according to the detection result.
Optionally, the number of the power supply output ends is multiple, and the wireless radio frequency power supply system further includes: and the voltage distribution circuit is provided with an input end and a plurality of output ends, the input end is coupled with the second end of the first switch, and the plurality of output ends are respectively connected with the corresponding power supply output ends.
Optionally, when the voltage of the rectified signal is greater than or equal to a first preset threshold voltage, the first control unit controls the first switch to be turned on and the second switch to be turned off, and when the voltage of the rectified signal is smaller than the first preset threshold voltage, the first switch is controlled to be turned off and the second switch is controlled to be turned on, and the control over the first switch and the second switch is released until the voltage of the rectified signal is greater than or equal to the first preset threshold voltage again.
Optionally, the first control unit includes: the first end of the auxiliary measuring capacitor is connected with the second end of the rectifying unit; a first voltage comparator, a first input end of which is connected to a second end of the auxiliary measurement capacitor to receive a capacitor voltage, a second input end of which receives a first preset threshold voltage, an output end of the first voltage comparator outputs a first logic level when the capacitor voltage is greater than or equal to the first preset threshold voltage, and outputs a second logic level when the voltage of the rectified signal is less than the first preset threshold voltage, wherein the first logic level is different from the second logic level; and the first switch control subunit is connected with the output end of the first voltage comparator, controls the first switch to be switched on and the second switch to be switched off in response to a first logic level, controls the first switch to be switched off and the second switch to be switched on in response to a second logic level, and releases the control on the first switch and the second switch until the first voltage comparator outputs the first logic level again.
Optionally, when the first control unit releases the control over the first switch and the second switch, when the energy storage voltage is greater than or equal to a second preset threshold voltage, the second control unit controls the first switch to be turned on, and when the energy storage voltage is less than the second preset threshold voltage, the first switch is controlled to be turned off.
Optionally, the second control unit includes: a second voltage comparator, a first input end of which is connected to the energy storage unit to receive an energy storage voltage, a second input end of which receives a second preset threshold voltage, and outputs a third logic level when the energy storage voltage is greater than or equal to the second preset threshold voltage, and outputs a fourth logic level when the energy storage voltage is less than the second preset threshold voltage, wherein the third logic level is different from the fourth logic level; and the second switch control subunit is connected with the output end of the second voltage comparator, responds to the third logic level, controls the first switch to be switched on, and responds to the fourth logic level, and controls the first switch to be switched off.
Optionally, the rectifying unit is a boost rectifying circuit.
To solve the above technical problem, an embodiment of the present invention provides a radio frequency system, including: the wireless radio frequency power supply system; the load is connected with the power supply output end.
Optionally, the load is selected from one or more of: a photoresistor sensor, a thermistor sensor, a vibration resistor sensor, an air pressure differential resistance sensor, a moisture content capacitive sensor and a humidity capacitive sensor.
Optionally, the radio frequency system further includes: an antenna.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in an embodiment of the present invention, a wireless radio frequency power supply system is provided, including: a rectifying unit, a first end of which is coupled with the antenna and is suitable for rectifying the output signal of the antenna, and a second end of which outputs a rectified signal; a first switch, a first terminal of which is coupled to a second terminal of the rectifying unit, and a second terminal of which is directly or indirectly coupled to a power supply output terminal; a second switch having a first terminal coupled to the second terminal of the rectifying unit; the input end of the energy storage unit is connected with the second end of the second switch, and the energy storage unit is suitable for storing energy of the received rectification signal to generate energy storage voltage; the first control unit is suitable for detecting the voltage of the rectification signal and controlling the first switch and the second switch according to the detection result or releasing the control of the first switch and the second switch; and the second control unit is suitable for detecting the energy storage voltage when the first control unit releases the control over the first switch and the second switch, and controlling the first switch according to the detection result. By adopting the scheme, the received electromagnetic waves can be converted into the rectification signals by arranging the rectification unit and the energy storage unit, and then the rectification signals are stored with energy, and the switch and the control unit are utilized to control the power supply mode, so that when wireless power supply is realized, the electromagnetic waves with unstable electric quantity are effectively converted and stored, and the voltage demand and the power supply stability of power supply are improved.
Furthermore, through setting up the auxiliary measurement electric capacity, can adopt the electric capacity voltage of auxiliary measurement electric capacity to compare with presetting threshold voltage to respond to the comparison result, control the switch, compare in the voltage that directly adopts the rectification signal and presetting threshold voltage and compare, because electric capacity voltage is more stable, and the voltage value is higher, can improve and measure the accuracy.
Drawings
Fig. 1 is a schematic circuit diagram of a wireless rf power supply system according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of another wireless RF power supply system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a radio frequency system according to an embodiment of the present invention.
Detailed Description
In the prior art, sensors are mostly integrated in various chips and powered by wires or batteries, however, a working scene that limited power supply or battery replacement is not applicable exists in various fields, and effective application of the sensors is seriously influenced.
The inventor of the present invention has found through research that when a signal is transmitted and received through an antenna, a large amount of electromagnetic waves are often transmitted or received, and the electromagnetic waves are converted to be used as a power supply source.
Further, since the size of the electromagnetic wave is unstable, the sensor is directly powered by the converted signal, which may cause unstable electric quantity.
The inventor of the present invention has further studied and found that, in the prior art, the received electromagnetic wave can not be effectively converted and stored, so that the electromagnetic wave is directly influenced by the size of the electromagnetic wave when power is supplied by the electromagnetic wave.
In an embodiment of the present invention, a wireless radio frequency power supply system is provided, including: a rectifying unit, a first end of which is coupled with the antenna and is suitable for rectifying the output signal of the antenna, and a second end of which outputs a rectified signal; a first switch, a first terminal of which is coupled to a second terminal of the rectifying unit, and a second terminal of which is directly or indirectly coupled to a power supply output terminal; a second switch having a first terminal coupled to the second terminal of the rectifying unit; the input end of the energy storage unit is connected with the second end of the second switch, and the energy storage unit is suitable for storing energy of the received rectification signal to generate energy storage voltage; the first control unit is suitable for detecting the voltage of the rectification signal and controlling the first switch and the second switch according to the detection result or releasing the control of the first switch and the second switch; and the second control unit is suitable for detecting the energy storage voltage when the first control unit releases the control over the first switch and the second switch, and controlling the first switch according to the detection result. By adopting the scheme, the received electromagnetic waves can be converted into the rectification signals by arranging the rectification unit and the energy storage unit, and then the rectification signals are stored with energy, and the switch and the control unit are utilized to control the power supply mode, so that when wireless power supply is realized, the electromagnetic waves with unstable electric quantity are effectively converted and stored, and the voltage demand and the power supply stability of power supply are improved.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a wireless radio frequency power supply system according to an embodiment of the present invention.
As shown in fig. 1, the wireless rf power supply system may include: the power supply circuit comprises a rectifying unit 101, a first switch 111, a second switch 112, an energy storage unit 121, a first control unit 131, a second control unit 132 and a power supply output end 161.
The first terminal of the rectifying unit 101 is coupled to the antenna and adapted to rectify an output signal of the antenna, and the second terminal of the rectifying unit outputs the rectified signal.
Specifically, the antenna may be externally connected to the radio frequency power supply system, and input the received electromagnetic wave signal to the rectification unit 101. Wherein the electromagnetic wave may be a high frequency electromagnetic wave.
Further, the rectifying unit 101 may be a boost rectifying circuit to perform boost rectification on the received electromagnetic wave. For example, the boost rectification circuit can generate a rectification signal V after boost rectificationoThe rectified signal VoThe dc signal may be used, in which the intensity of the electromagnetic wave determines the output current of the boost rectifier circuit.
In a specific implementation manner of the embodiment of the present invention, when the intensity of the electromagnetic wave reaches about-25 dBm, the boost rectification effect of the rectification unit 101 can be better achieved, and below this number, the rectification signal V is rectifiedoMay be affected.
The first terminal of the first switch 111 may be coupled to the second terminal of the rectifying unit 101, and the second terminal thereof is directly or indirectly coupled to the power supply output terminal 161.
A first terminal of the second switch 112 is coupled to a second terminal of the rectifying unit.
In the embodiment of the present invention, by setting the switches and the closures of the first switch 111 and the second switch 112 respectively, direct power supply or energy storage may be implemented by using the rectified signal according to specific situations.
The input end of the energy storage unit 121 is connected to the second end of the second switch, and the energy storage unit is adapted to store energy for the received rectified signal to generate an energy storage voltage.
In a specific implementation, the energy storage unit 121 may be a capacitor.
In the embodiment of the present invention, the energy storage unit 121 is arranged to realize a pre-charging function, so as to supply power to the system when the power storage is sufficient, and also supply power to the system when the electromagnetic wave signal is weak or unstable, which is helpful for converting and storing the electromagnetic wave with unstable electric quantity, thereby improving the voltage requirement for power supply and the power supply stability.
The first control unit 131 is adapted to rectify the rectified signal VoThe detection is performed, and the first switch 111 and the second switch 112 are controlled or the control of the first switch 111 and the second switch 112 is released according to the detection result.
Further, when the rectified signal VoWhen the voltage of the rectified signal is less than the first preset threshold voltage, the first control unit 131 controls the first switch 111 to be turned on and the second switch 112 to be turned off, and when the voltage of the rectified signal is less than the first preset threshold voltage, the first switch 111 is controlled to be turned off and the second switch 112 is controlled to be turned on, and the control of the first switch 111 and the second switch 112 is released until the rectified signal V is detectedoAgain is greater than or equal to the first preset threshold voltage.
In the embodiment of the invention, the rectification signal V is setoWhen the voltage is greater than or equal to the first preset threshold voltage, the first control unit 131 controls the first switch 111 to be turned on and the second switch 112 to be turned off, and the voltage output by the rectification unit 101 can be used when the electromagnetic wave signal is strongRectified signal VoPower is directly supplied to a load (e.g., a sensor) connected to the power supply output terminal 161, thereby improving power utilization.
In the embodiment of the invention, the rectification signal V is setoIs less than the first preset threshold voltage, the first switch 111 is controlled to be turned off and the second switch 112 is controlled to be turned on, and the control of the first switch 111 and the second switch 112 is released until the rectified signal V is obtainedoThe voltage of the energy storage unit 121 is greater than or equal to the first preset threshold voltage again, when the electromagnetic wave signal is weak, the connection between the rectification unit 101 and the power supply output terminal 161 is disconnected, the load is not charged, and the energy storage unit 121 can realize a charging function or a power supply function for the load by releasing the control on the first switch 111 and the second switch 112 according to specific situations.
The second control unit 132 is adapted to detect the energy storage voltage 121 when the first control unit 131 releases the control of the first switch 111 and the second switch 112, and control the first switch 111 according to the detection result.
Further, when the first control unit 131 releases the control over the first switch 111 and the second switch 112, when the energy storage voltage is greater than or equal to a second preset threshold voltage, the second control unit 132 controls the first switch 111 to be turned on, and when the energy storage voltage is less than the second preset threshold voltage, the first switch 111 is controlled to be turned off.
In the embodiment of the present invention, when the energy storage voltage is greater than or equal to a second preset threshold voltage, the second control unit 132 controls the first switch 111 to be turned on, so as to implement a power supply function of the energy storage unit 121 to a load; by controlling the first switch 111 to be turned off when the energy storage voltage is smaller than the second preset threshold voltage, the charging function of the energy storage unit 121 can be realized.
In the embodiment of the present invention, by providing the rectifying unit 101 and the energy storage unit 121, the received electromagnetic wave can be converted into a rectified signal, and the rectified signal is stored with energy, and the first switch 111, the second switch 112, the first control unit 131, and the second control unit 132 are utilized to control the power supply manner, so that wireless power supply is realized, and meanwhile, the electromagnetic wave with unstable electric quantity is effectively converted and stored, so as to improve the voltage requirement of power supply and the power supply stability.
It should be noted that the release control in this context means that the controlled object is no longer controlled, and for example, the signal output to the controlled object enters a high impedance state, and at this time, the state of the controlled object is maintained as the state before the release control, or is determined by another control signal.
Referring to fig. 2, fig. 2 is a schematic circuit structure diagram of another wireless rf power supply system according to an embodiment of the present invention.
The other wireless rf power supply system may include various parts of the wireless rf power supply system shown in fig. 1, and may further include a voltage distribution circuit 171.
The voltage distribution circuit 171 may have an input terminal coupled to the second terminal of the first switch 111 and a plurality of output terminals respectively connected to the corresponding power supply output terminals.
In the embodiment of the present invention, by providing the voltage distribution circuit 171, the power supply output terminals corresponding to a plurality of power supply terminals can be shunted, thereby realizing that a plurality of loads are supplied with power at the same time.
In the embodiment of the invention, a plurality of power supply output ends can be arranged corresponding to two or more power supply types, so that two or more types of loads can be supplied, and the application range is effectively enlarged.
Further, the first control unit 131 may include: an auxiliary measurement capacitor 1311, a first voltage comparator 1312, and a first switch control subunit 1313.
Wherein a first end of the auxiliary measurement capacitor 1311 is connected to a second end of the rectifying unit.
Wherein the rectified signal VoThe auxiliary measurement capacitor 1311 is continuously charged such that the capacitor voltage across the auxiliary measurement capacitor 1311Continuously increasing and comparing the rectified signal VoAnd is more stable.
In the embodiment of the present invention, by providing the auxiliary measurement capacitor 1311, the capacitor voltage of the auxiliary measurement capacitor 1311 may be compared with a preset threshold voltage, and the switch may be controlled in response to the comparison result.
The first voltage comparator 1312 has a first input terminal connected to the second terminal of the auxiliary measuring capacitor for receiving the capacitor voltage, and a second input terminal receiving a first predetermined threshold voltage Vt1When the capacitor voltage is greater than or equal to the first preset threshold voltage Vt1Then, the output terminal of the first voltage comparator 1312 outputs a first logic level, and the rectified signal V is outputoIs less than a first predetermined threshold voltage Vt1And outputting a second logic level, wherein the first logic level is different from the second logic level.
As a non-limiting example, it may be set when the capacitor voltage is greater than or equal to the first preset threshold voltage Vt1When the first logic level is a logic high level, for example, Vdd or logic 1; when the capacitor voltage is less than the first preset threshold voltage Vt1When the second logic level is a logic low level, for example, a logic 0.
And a first switch control subunit 1313, connected to the output terminal of the first voltage comparator, and configured to control the first switch to be turned on and the second switch to be turned off in response to a first logic level, and control the first switch to be turned off and the second switch to be turned on in response to a second logic level, and release the control of the first switch and the second switch until the first voltage comparator outputs the first logic level again.
In the embodiment of the present invention, by providing the first switch control subunit 1313, when the electromagnetic wave signal is weak, the connection between the rectifying unit 101 and the power supply output terminal 161 may be disconnected, the load is not charged, and by releasing the control on the first switch 111 and the second switch 112, the energy storage unit 121 may implement a charging function or a power supply function for the load according to specific situations.
Further, the second control unit 132 may include a second voltage comparator 1321 and a second switch control subunit 1322.
A first input terminal of the second voltage comparator 1321 may be connected to the energy storage unit 121 for receiving the energy storage voltage, and a second input terminal thereof receives a second predetermined threshold voltage Vt2And outputting a third logic level when the energy storage voltage is greater than or equal to a second preset threshold voltage, and outputting a fourth logic level when the energy storage voltage is less than the second preset threshold voltage, wherein the third logic level is different from the fourth logic level.
As a non-limiting example, it may be set when the capacitor voltage is greater than or equal to the second preset threshold voltage Vt2When the third logic level is a logic high level, for example, Vdd or logic 1; when the capacitor voltage is less than the second preset threshold voltage Vt2When the second logic level is a logic low level, the output signal is a logic high level.
And a second switch control subunit 1322, connected to the output end of the second voltage comparator, for controlling the first switch 111 to be turned on in response to the third logic level, and for controlling the first switch 111 to be turned off in response to the fourth logic level.
In the embodiment of the present invention, by providing the second switch control subunit 1322, the power supply function and the charging function of the energy storage unit 121 to the load can be implemented.
For more details about the alternative wireless rf power supply system shown in fig. 2, please refer to the description of the wireless rf power supply system in fig. 1, which is not described herein again.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a radio frequency system according to an embodiment of the present invention. The wireless radio frequency system may include the wireless radio frequency power supply system 100 shown in fig. 1 or fig. 2, and may further include a load 181 and an antenna 191.
The load 181 may be connected to a power supply output end of the wireless rf power supply system 100, so as to supply power to the wireless rf power supply system 100.
Further, the load 181 may be selected from one or more sensors.
In particular, the load 181 may be selected from common resistive or voltage-type sensors, including, for example, photoresistor-type sensors, thermistor-type sensors, and shock-resistance-type sensors; the load 181 may also be a differential resistive sensor, including, for example, a pneumatic differential resistive sensor and a differential pressure differential resistive sensor; the load 181 may also be a capacitive sensor, including, for example, a moisture content capacitive sensor and a humidity capacitive sensor.
More specifically, the supply voltage of the sensor may be provided by one of the supply outputs (e.g., Vdd voltage output interface), and the different supply outputs may respectively correspond to different sensor types, for example, there may be a common resistive/voltage type sensor supply output, a capacitive type sensor supply output, a differential resistive type sensor supply output, and the like.
In a specific implementation, according to the specific requirement of the sensor for power supply, the first control unit may set an appropriate first preset threshold voltage, and the second control unit may set an appropriate second preset threshold voltage, so as to better implement power supply for the sensor.
It should be noted that, in the embodiment of the present invention, a load with large power consumption and a high power supply requirement may be supplied, for example, a sensor with large power consumption, an analog-to-digital conversion module connected to the sensor, and the like. Specifically, in the embodiment of the present invention, the received continuous electromagnetic wave is converted into the rectified signal, so that a larger power and a larger range of power supply can be realized.
In the detailed implementation, please refer to the description of the rf power supply system in fig. 1 to 2 for further details regarding the rf power system, which will not be described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A wireless radio frequency power supply system, comprising:
a rectifying unit, a first end of which is coupled with the antenna and is suitable for rectifying the output signal of the antenna, and a second end of which outputs a rectified signal;
a first switch, a first terminal of which is coupled to a second terminal of the rectifying unit, and a second terminal of which is directly or indirectly coupled to a power supply output terminal;
a second switch having a first terminal coupled to the second terminal of the rectifying unit;
the input end of the energy storage unit is connected with the second end of the second switch, and the energy storage unit is suitable for storing energy of the received rectification signal to generate energy storage voltage;
the first control unit is suitable for detecting the voltage of the rectification signal and controlling the first switch and the second switch according to the detection result or releasing the control of the first switch and the second switch;
and the second control unit is suitable for detecting the energy storage voltage when the first control unit releases the control over the first switch and the second switch, and controlling the first switch according to the detection result.
2. The wireless radio frequency power supply system according to claim 1, wherein the number of the power supply output terminals is plural, the wireless radio frequency power supply system further comprising:
and the voltage distribution circuit is provided with an input end and a plurality of output ends, the input end is coupled with the second end of the first switch, and the plurality of output ends are respectively connected with the corresponding power supply output ends.
3. The wireless radio frequency power supply system according to claim 1,
when the voltage of the rectified signal is larger than or equal to a first preset threshold voltage, the first control unit controls the first switch to be switched on and the second switch to be switched off, and when the voltage of the rectified signal is smaller than the first preset threshold voltage, the first switch is controlled to be switched off and the second switch is controlled to be switched on, and the control over the first switch and the second switch is released until the voltage of the rectified signal is larger than or equal to the first preset threshold voltage again.
4. The wireless radio frequency power supply system according to claim 3, wherein the first control unit comprises:
the first end of the auxiliary measuring capacitor is connected with the second end of the rectifying unit;
a first voltage comparator, a first input end of which is connected to a second end of the auxiliary measurement capacitor to receive a capacitor voltage, a second input end of which receives a first preset threshold voltage, an output end of the first voltage comparator outputs a first logic level when the capacitor voltage is greater than or equal to the first preset threshold voltage, and outputs a second logic level when the voltage of the rectified signal is less than the first preset threshold voltage, wherein the first logic level is different from the second logic level;
and the first switch control subunit is connected with the output end of the first voltage comparator, controls the first switch to be switched on and the second switch to be switched off in response to a first logic level, controls the first switch to be switched off and the second switch to be switched on in response to a second logic level, and releases the control on the first switch and the second switch until the first voltage comparator outputs the first logic level again.
5. The wireless radio frequency power supply system according to claim 1,
when the first control unit releases the control over the first switch and the second switch, when the energy storage voltage is larger than or equal to a second preset threshold voltage, the second control unit controls the first switch to be switched on, and when the energy storage voltage is smaller than the second preset threshold voltage, the first switch is controlled to be switched off.
6. The wireless radio frequency power supply system according to claim 5, wherein the second control unit comprises:
a second voltage comparator, a first input end of which is connected to the energy storage unit to receive an energy storage voltage, a second input end of which receives a second preset threshold voltage, and outputs a third logic level when the energy storage voltage is greater than or equal to the second preset threshold voltage, and outputs a fourth logic level when the energy storage voltage is less than the second preset threshold voltage, wherein the third logic level is different from the fourth logic level;
and the second switch control subunit is connected with the output end of the second voltage comparator, responds to the third logic level, controls the first switch to be switched on, and responds to the fourth logic level, and controls the first switch to be switched off.
7. The wireless radio frequency power supply system according to claim 1, wherein the rectifying unit is a boost rectifying circuit.
8. A wireless radio frequency system, comprising:
the wireless radio frequency power supply system of claims 1 to 7;
the load is connected with the power supply output end.
9. The wireless radio frequency system according to claim 8,
the load is selected from one or more of:
a photoresistor sensor, a thermistor sensor, a vibration resistor sensor, an air pressure differential resistance sensor, a moisture content capacitive sensor and a humidity capacitive sensor.
10. The wireless radio frequency system according to claim 8, further comprising: an antenna.
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