CN111564910A - Wireless power supply circuit and wireless power supply ultrasonic measuring device - Google Patents

Abstract

The invention discloses a wireless power supply circuit and a wireless power supply ultrasonic metering device, wherein the circuit comprises a collecting antenna, a matching rectification circuit, a power supply management module and an energy storage module; the collecting antenna is connected with the input end of the matching rectification circuit, the output end of the matching rectification circuit is connected with the input end of the power management module, the first output end of the power management module is connected with the energy storage module, and the second output end of the power management module is connected with the first load; the collecting antenna is used for receiving electromagnetic waves and transmitting the electromagnetic waves to the matching rectification circuit; the matching rectification circuit is used for converting electromagnetic waves into direct-current voltage; the power supply management module is used for charging the energy storage module and supplying power to the first load; the power management module is further used for receiving the power voltage output by the energy storage module and supplying power to the first load through the power voltage. The invention can charge the energy storage module and supply power to the load by collecting the electric energy converted from the electromagnetic wave, so that the load can stably run for a long time.

Description

Wireless power supply circuit and wireless power supply ultrasonic measuring device

technical field

The invention relates to the field of circuit electronics, in particular to a wireless power supply circuit and a wireless power supply ultrasonic measuring device.

Background technique

With the continuous development of Internet of Things technology, various metering devices are constantly being updated. For example, traditional mechanical water meters have been gradually replaced by electronic water meters. At present, the popular electronic water meter in the market is usually an ultrasonic water meter, and its power supply methods mainly include battery power supply and self-energy power supply. The battery power supply method generally supplies power to the ultrasonic water meter through a disposable lithium sub-battery. After the battery power is exhausted, the battery needs to be replaced. The self-extraction power supply method is to convert the water pressure when the water flows into electrical energy through a piezoelectric converter for storage and use.

In the existing mainstream power supply methods, the use of battery power supply not only requires regular replacement of batteries, which consumes a lot of labor costs, and large-scale battery replacement of water meters will lead to a huge number of discarded batteries. If the treatment is not timely, it will also cause serious environmental pollution. The self-extraction power supply method needs to rely on the water pressure to generate electric energy during the water flow process. The electric energy conversion cannot be realized when the pipeline is not running, and the water pressure will be reduced after the water pressure is converted into electric energy. In order to protect the water Pressure can also increase the cost of water supply at the source.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a wireless power supply circuit and a wireless power supply ultrasonic metering device, which aims to solve the problem that the power supply mode of the existing metering device is likely to cause greater pollution or increase the cost.

In order to achieve the above purpose, the present invention provides a wireless power supply circuit, including a collection antenna, a matching rectifier circuit, a power management module and an energy storage module;

The collecting antenna is connected to the input end of the matching rectifier circuit, the output end of the matching rectifier circuit is connected to the input end of the power management module, and the first output end of the power management module is connected to the energy storage module connection, the second output end of the power management module is connected to the first load;

the collecting antenna is used to receive electromagnetic waves in the space and transmit them to the matching rectifier circuit;

the matching rectifier circuit for converting the electromagnetic wave into a DC voltage and outputting it to the power management module;

the power management module, configured to receive the DC voltage, and use the DC voltage to charge the energy storage module and supply power to the first load;

The power management module is further configured to receive the power supply voltage output by the energy storage module, and supply power to the first load through the power supply voltage.

Optionally, the matching rectifier circuit includes a matching circuit and a rectifier circuit;

The matching circuit includes a first inductor and a first capacitor, the first end of the first inductor is connected to the collecting antenna, the second end of the first inductor is connected to the input end of the rectifier circuit, and the The first end of the first capacitor is connected to the first end of the first inductor, and the second end of the first capacitor is grounded;

The matching circuit is used for receiving the electromagnetic wave sent by the collecting antenna, converting it into an alternating voltage and outputting it to the rectifying circuit.

Optionally, the rectifier circuit includes a second capacitor, a first diode, a second diode and a third capacitor;

The first end of the second capacitor is connected to the second end of the first inductor, and the second end of the second capacitor is respectively connected to the cathode of the first diode and the second end of the second diode. The anode is connected, the anode of the first diode is grounded, the cathode of the second diode is connected to the input end of the power management module, and the first end of the third capacitor is connected to the second diode The cathode of the tube is connected, and the second end of the third capacitor is grounded;

The rectifier circuit is used to convert the AC voltage output by the matching circuit into a DC voltage and output it to the power management module.

Optionally, the power management module includes a fourth capacitor, a second inductor and a power management chip;

The first end of the second inductor is connected to the cathode of the second diode, the second end of the second inductor is connected to the input end of the power management chip, and the first output of the power management chip The terminal is connected to the energy storage module, the second output terminal of the power management chip is connected to the first load, the first terminal of the fourth capacitor is connected to the first terminal of the second inductor, and the fourth The second terminal of the capacitor is grounded.

Optionally, the power management module further includes a boost circuit, and the boost circuit includes the second inductor and the power management chip;

The boosting circuit is used for boosting the received DC voltage to obtain the working voltage of the first load.

Optionally, the power management module further includes a charging indication module, and the charging indication module includes a first light-emitting diode and a first triode;

The anode of the first light-emitting diode is connected to the second output terminal of the power management chip, the cathode of the first light-emitting diode is connected to the collector of the first triode, and the The emitter is grounded, and the base of the first transistor is connected to the third output terminal of the power management chip;

The power management chip is further configured to compare the power supply voltage of the energy storage module with a preset voltage threshold, and output through the third output terminal when the power supply voltage of the energy storage module is higher than the preset voltage threshold high level.

Optionally, the power management module further includes a third inductor, and the inductor connection terminal of the power management chip is connected to the input terminal of the power management chip through the third inductor.

Optionally, the power management chip is any one of a BQ25504 type chip, an LTC3108 type chip or an AEM10941 type chip.

Optionally, the energy storage module is a super capacitor or an energy storage rechargeable battery.

In addition, in order to achieve the above object, the present invention also provides a wireless power supply ultrasonic metering device, the wireless power supply ultrasonic metering device includes a first load and a wireless power supply circuit connected to the first load, and the first load is an ultrasonic metering device. , the wireless power supply circuit is configured as the wireless power supply circuit as described above.

The present invention can collect the electromagnetic waves in the nearby space by collecting the antenna, and generate the corresponding DC voltage by matching the rectifier circuit. When the DC voltage received by the power management module is higher than the minimum working voltage of the power management module, the DC voltage can be adjusted Processing is to simultaneously power the first load and charge the energy storage module with the DC voltage. When the DC voltage received by the power management module cannot be converted into the power supply voltage of the first load, the power management module can also receive the power supply voltage output by the energy storage module to supply power to the first load, so that the first load can obtain long-term Stable power supply to ensure the normal operation of the first load.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

FIG. 1 is a schematic block diagram of an embodiment of a wireless power supply circuit according to the present invention;

FIG. 2 is a schematic diagram of the circuit structure of the embodiment of FIG. 1;

FIG. 3 is a schematic structural diagram of a part of the circuit in another embodiment of the wireless power supply circuit of the present invention.

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Description of reference numbers:

label name label name 10 collection antenna C1 first capacitor 20 Matching rectifier circuit C2 second capacitor 30 Power Management Module C3 third capacitor 40 Energy storage module C4 Fourth capacitor 50 first load D1 first diode twenty one matching circuit D2 second diode twenty two Rectifier circuit U1 power management chip L1 first inductance led led L2 second inductance Q1 first triode L3 third inductance

Detailed ways

It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

The present invention provides a wireless power supply circuit, which is applied to a wireless power supply ultrasonic metering device. The wireless power supply ultrasonic metering device can be an ultrasonic water meter installed in each household, and can also be used for other electronic equipment whose working voltage conforms to the output voltage range. powered by.

Referring to FIG. 1 , in one embodiment, the wireless power supply circuit includes a collection antenna 10 , a matching rectifier circuit 20 , a power management module 30 and an energy storage module 40 . The collecting antenna 10 is connected to the input end of the matching rectifier circuit 20, the output end of the matching rectifier circuit 20 is connected to the input end of the power management module 30, the first output end of the power management module 30 is connected to the energy storage module 40, and the power management module 30 The second output terminal of , is connected to the first load 50 . The collecting antenna 10 is an electromagnetic wave collecting antenna, which can receive electromagnetic waves in the surrounding space and transmit them to the matching rectifier circuit 20 . In the matching rectifier circuit 20 , the electromagnetic waves in the space around the collecting antenna 10 can be fully collected through impedance matching, and the electromagnetic waves are rectified and converted into DC voltages and output to the power management module 30 . The power management module 30 has two output terminals. After the power management module 30 receives the DC voltage output by the matching rectifier circuit 20, it can supply power to the first load 50 through the second output terminal, and store energy through the first output terminal. Module 40 is charged. When the DC voltage received by the power management module 30 is lower than the minimum working voltage of the power management module 30 or the voltage is unstable, the power supply voltage output by the energy storage module 40 can also be received, and the power supply voltage can be processed as the first load 50 for power.

In this embodiment, the electromagnetic waves in the nearby space can be collected by the collecting antenna 10, and the corresponding DC voltage can be generated by matching the rectifier circuit 20, and the DC voltage received by the power management module 30 is higher than the minimum operation of the power management module 30. voltage, the DC voltage can be processed to simultaneously supply power to the first load 50 and charge the energy storage module 40 through the DC voltage. When the DC voltage received by the power management module 30 cannot be converted into the power supply voltage of the first load 50, the power management module 30 may also receive the power supply voltage output by the energy storage module 40 to supply power to the first load 50, so that the first load 50 is supplied with power. The load 50 can obtain long-term stable power supply to ensure the normal operation of the first load 50 .

Further, referring to FIG. 1 and FIG. 2 together, the above matching rectifier circuit 20 may include a matching circuit 21 and a rectifier circuit 22 . The matching circuit 21 includes a first inductor L1 and a first capacitor C1. The first end of the first inductor L1 is connected to the collecting antenna 10, and the second end of the first inductor L1 is connected to the input end of the rectifier circuit 22. The first end is connected to the first end of the first inductor L1, and the second end of the first capacitor C1 is grounded. The rectifier circuit 22 includes a second capacitor C2, a first diode D1, a second diode D2 and a third capacitor C3. The first end of the second capacitor C2 is connected to the second end of the first inductor L1, the second end of the second capacitor C2 is connected to the cathode of the first diode D1 and the anode of the second diode D2 respectively, the first The anode of the diode D1 is grounded, the cathode of the second diode D2 is connected to the input end of the power management module 30, the first end of the third capacitor C3 is connected to the cathode of the second diode D2, and the The second terminal is grounded. The matching circuit 21 can achieve impedance matching through the first inductor L1 and the first capacitor C1, so that the electromagnetic waves in the space around the collecting antenna 10 can be sufficiently collected and converted into an AC voltage. The rectifier circuit 22 is a double voltage rectifier circuit, which can convert the AC voltage collected and converted by the matching circuit 21 into a DC voltage, and then double-boost the voltage and output it to the power management module 30 . The electromagnetic wave collected by the collecting antenna 10 can be converted into a DC voltage through the matching circuit 21 and the rectifying circuit 22 .

Further, the above-mentioned power management module 30 includes a fourth capacitor C4, a second inductor L2 and a power management chip U1. The first end of the second inductor L2 is connected to the cathode of the second diode D2, the second end of the second inductor L2 is connected to the input end of the power management chip U1, and the first output end of the power management chip U1 is connected to the energy storage module 40 is connected, the second output end of the power management chip U1 is connected to the first load 50, the first end of the fourth capacitor C4 is connected to the first end of the second inductor L2, and the second end of the fourth capacitor C4 is grounded. The second inductor L2 and the components in the power management chip U1 form a boost circuit, which can boost the received DC voltage to obtain the working voltage of the first load 50 and output it to the first load 50 for power supply, and also The output can be output to the energy storage module 40 for power supply. The fourth capacitor C4 can play the role of filtering the AC signal, so as to prevent the AC signal from interfering with the DC voltage.

Further, the above-mentioned power management module 30 may further include a charging indication module, and the charging indication module includes a first light emitting diode LED and a first transistor Q1. The anode of the first light-emitting diode LED is connected to the second output terminal of the power management chip U1, the cathode of the first light-emitting diode LED is connected to the collector of the first transistor Q1, the emitter of the first transistor Q1 is grounded, and the The base of a transistor Q1 is connected to the third output terminal of the power management chip U1. The power management chip U1 can detect the power supply voltage of the energy storage module 40 when charging the energy storage module 40, and when it is detected that the power supply voltage of the energy storage module 40 is higher than the preset voltage threshold, it can determine the energy storage module 40 The power is good, and the third output terminal of the power management chip U1 outputs a high level. The base of the first transistor Q1 switches to a conducting state after receiving a high level, and the first light-emitting diode LED is powered on and emits light. , to prompt the user that the charging of the energy storage module 40 is completed. It can be understood that, as shown in FIG. 3 , the base of the first transistor Q1 can be connected to the third output terminal of the power management chip U1 through a resistor, so as to realize the current limiting effect and prevent the first transistor Q1 from Damaged due to excessive current.

Referring to FIG. 3 , the power management module 30 may further be provided with a third inductor L3 , and the inductor connection terminal of the power management chip U1 is connected to the input terminal of the power management chip U1 through the third inductor L3 . The third inductor L3 can detect whether the DC voltage satisfies the minimum working voltage of the power management chip U1, so as to control the power management chip U1 to be turned on and off.

Further, the above-mentioned power management chip U1 may be any one of a BQ25504 type chip, an LTC3108 type chip or an AEM10941 type chip. As shown in Figure 3, when the BQ25504 chip is selected as the power management chip U1, the VIN_DC pin, VBAT pin, VSTOR pin, VBAT_OK pin and LBST pin of the BQ25504 chip are the input terminals of the power management chip U1 respectively. , a first output end, a second output end, a third output end and an inductance connection end. The minimum operating voltage of the BQ25504 chip is 0.13V, that is, when the DC voltage output by the rectifier circuit 22 is greater than 0.13V, the power management chip U1 can boost the DC voltage to charge the energy storage module 40 and power the first load 50 . It can be understood that, the above-mentioned energy storage module 40 may be a super capacitor or an energy storage rechargeable battery. The voltage range of the power supply voltage output by the energy storage module 40 may be 2.5V-5.25V. The power management chip U1 can adjust the power supply voltage and output the working voltage of the first load 50 . When the first load 50 is an ultrasonic water meter, its working voltage may be 3.3V.

It should be noted that the power management chip U1 used in the above embodiments is a boost converter with a lower minimum operating voltage, a lower quiescent operating current, and a higher chip voltage conversion efficiency, so that the The DC voltage converted by the electromagnetic wave can drive the power management chip U1 to realize energy collection and battery management functions.

The present invention also provides a wireless power supply ultrasonic metering device, the wireless power supply ultrasonic metering device includes a first load and a wireless power supply circuit connected to the first load, the first load can be an ultrasonic metering device, and the structure of the wireless power supply circuit can refer to The foregoing embodiments are not repeated here. As a matter of course, since the wireless power supply ultrasonic metering device of this embodiment adopts the technical solution of the above-mentioned wireless power supply circuit, the wireless power supply ultrasonic metering device has all the beneficial effects of the above-mentioned wireless power supply circuit.

The above are only optional embodiments of the present invention, which are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technologies Fields are similarly included in the scope of patent protection of the present invention.

Claims (10)

1. A wireless power supply circuit is characterized by comprising a collecting antenna, a matching rectification circuit, a power supply management module and an energy storage module;

the collecting antenna is connected with the input end of the matching rectification circuit, the output end of the matching rectification circuit is connected with the input end of the power management module, the first output end of the power management module is connected with the energy storage module, and the second output end of the power management module is connected with a first load;

the collecting antenna is used for receiving electromagnetic waves in the space and transmitting the electromagnetic waves to the matching rectification circuit;

the matching rectification circuit is used for converting the electromagnetic waves into direct-current voltage and outputting the direct-current voltage to the power management module;

the power supply management module is used for receiving the direct-current voltage, charging the energy storage module through the direct-current voltage and supplying power to the first load;

the power management module is further configured to receive a power voltage output by the energy storage module, and supply power to the first load through the power voltage.

2. The wireless power supply circuit according to claim 1, wherein the matching rectification circuit includes a matching circuit and a rectification circuit;

the matching circuit comprises a first inductor and a first capacitor, wherein the first end of the first inductor is connected with the collecting antenna, the second end of the first inductor is connected with the input end of the rectifying circuit, the first end of the first capacitor is connected with the first end of the first inductor, and the second end of the first capacitor is grounded;

and the matching circuit is used for receiving the electromagnetic waves sent by the collecting antenna, converting the electromagnetic waves into alternating-current voltage and outputting the alternating-current voltage to the rectifying circuit.

3. The wireless power supply circuit according to claim 2, wherein the rectifying circuit includes a second capacitor, a first diode, a second diode, and a third capacitor;

a first end of the second capacitor is connected with a second end of the first inductor, a second end of the second capacitor is respectively connected with a cathode of the first diode and an anode of the second diode, an anode of the first diode is grounded, a cathode of the second diode is connected with an input end of the power management module, a first end of the third capacitor is connected with a cathode of the second diode, and a second end of the third capacitor is grounded;

and the rectifying circuit is used for converting the alternating-current voltage output by the matching circuit into direct-current voltage and outputting the direct-current voltage to the power management module.

4. The wireless power supply circuit of claim 3, wherein the power management module comprises a fourth capacitor, a second inductor, and a power management chip;

the first end of the second inductor is connected with the cathode of the second diode, the second end of the second inductor is connected with the input end of the power management chip, the first output end of the power management chip is connected with the energy storage module, the second output end of the power management chip is connected with the first load, the first end of the fourth capacitor is connected with the first end of the second inductor, and the second end of the fourth capacitor is grounded.

5. The wireless power supply circuit of claim 4, wherein the power management module further comprises a boost circuit, the boost circuit comprising the second inductor and the power management chip;

the boost circuit is used for boosting the received direct-current voltage to obtain the working voltage of the first load.

6. The wireless power supply circuit of claim 4, wherein the power management module further comprises a charge indication module, the charge indication module comprising a first light emitting diode and a first triode;

the anode of the first light-emitting diode is connected with the second output end of the power management chip, the cathode of the first light-emitting diode is connected with the collector of the first triode, the emitter of the first triode is grounded, and the base of the first triode is connected with the third output end of the power management chip;

the power management chip is further used for comparing the power voltage of the energy storage module with a preset voltage threshold value, and outputting a high level through the third output end when the power voltage of the energy storage module is higher than the preset voltage threshold value.

7. The wireless power supply circuit of claim 4, wherein the power management module further comprises a third inductor, and the inductor connection terminal of the power management chip is connected to the input terminal of the power management chip through the third inductor.

8. The wireless power supply circuit as claimed in any one of claims 4 to 7, wherein the power management chip is any one of a BQ25504 type chip, an LTC3108 type chip or an AEM10941 type chip.

9. The wireless power supply circuit according to any one of claims 1 to 7, wherein the energy storage module is a super capacitor or an energy storage rechargeable battery.

10. A wireless power supply ultrasonic metering device, characterized in that the wireless power supply ultrasonic metering device comprises a first load and a wireless power supply circuit connected with the first load, the first load is the ultrasonic metering device, and the wireless power supply circuit is configured as the wireless power supply circuit of any one of claims 1-9.

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