CN117039208A

CN117039208A - Intelligent water meter measuring circuit, flow measuring method and intelligent water meter

Info

Publication number: CN117039208A
Application number: CN202310870435.0A
Authority: CN
Inventors: 王宇飞; 吉大纯; 李鑫
Original assignee: Longxin Zhongke Taiyuan Technology Co ltd
Current assignee: Longxin Zhongke Taiyuan Technology Co ltd
Priority date: 2023-07-14
Filing date: 2023-07-14
Publication date: 2023-11-10

Abstract

The embodiment of the application provides an intelligent water meter measuring circuit, a flow measuring method and an intelligent water meter, and relates to the technical field of integrated circuits, wherein the intelligent water meter measuring circuit comprises: a control module; the battery activation module is used for removing the passivation film of the lithium-ion battery under the control of the activation signal sent by the control module; the transducer interface module is used for connecting an external ultrasonic transducer; the control module is electrically connected with the battery activation module and the transducer interface module respectively. The activation process of the lithium battery can be in the controllable range of the control module, the activation effect of the lithium battery can be improved, the lithium battery can stably output large current to supply power for the control module, the accuracy of a control signal output by the control module can be improved, and the flow measurement result obtained through the ultrasonic transducer under the control of the control module is more accurate.

Description

Intelligent water meter measuring circuit, flow measuring method and intelligent water meter

Technical Field

The embodiment of the application relates to the technical field of integrated circuits, in particular to an intelligent water meter measuring circuit, a flow measuring method and an intelligent water meter.

Background

With the development of the internet of things, mechanical water meters are gradually replaced by intelligent water meters, and the most typical intelligent water meters are ultrasonic water meters. The ultrasonic water meter utilizes a pair of ultrasonic transducers to transmit and receive ultrasonic waves alternately or simultaneously in opposite directions, indirectly measures the flow velocity of fluid by detecting the forward flow and backward flow propagation time difference of the ultrasonic waves in a medium, and calculates the flow by the flow velocity, thereby realizing water flow measurement.

In the related art, since the lithium-ion battery has a long shelf life, it is often selected as a battery dedicated for a water meter. However, the lithium battery can generate the phenomenon that the surface passivation of lithium metal inhibits internal reaction in the long-time storage and use process, and the passivation film is formed, so that the lithium battery has difficulty in outputting large current.

Because the measurement accuracy of the intelligent water meter is influenced by the stability of the lithium-ion battery, when the lithium-ion battery forms a passivation film, a large current cannot be output, and the problem of low accuracy of the measurement result of the intelligent water meter can be caused.

Disclosure of Invention

In view of the above problems, the embodiment of the invention provides an intelligent water meter measuring circuit, a flow measuring method and an intelligent water meter, so as to solve the problem that in the prior art, a lithium ion battery cannot output large current after forming a passivation film, and the accuracy of a measuring result of the intelligent water meter is low.

In a first aspect, an embodiment of the present application provides an intelligent water meter measurement circuit, including:

a control module;

the battery activation module is used for removing the lithium-ion battery passivation film under the control of the activation signal sent by the control module;

the transducer interface module is used for connecting an external ultrasonic transducer;

the control module is electrically connected with the battery activation module and the transducer interface module respectively.

In a second aspect, an embodiment of the present application provides a flow measurement method applied to the intelligent water meter measurement circuit according to the first aspect, where the intelligent water meter measurement circuit includes: the device comprises a control module, a battery activation module and a transducer interface module; the method comprises the following steps:

sending an activation signal to the battery activation module through the control module;

removing a passivation film of the lithium-ion battery by the battery activation module in response to the activation signal;

transmitting a measurement signal to the transducer interface module through the control module;

transmitting the measurement signal to an ultrasonic transducer through the transducer interface module, receiving an echo signal transmitted by the ultrasonic transducer, and transmitting the measurement data to the control module; the measuring signal is used for controlling the ultrasonic transducer to measure flow and acquire the echo signal;

And determining a flow measurement result according to the measurement signal and the echo signal by the control module.

In a third aspect, embodiments of the present application provide an intelligent water meter comprising an intelligent water meter measurement circuit as described in the first aspect.

In the embodiment of the application, the control module can send the activation signal to the battery activation module to control the battery activation module to remove the passivation film of the lithium-ion battery, compared with the mode of arranging the energy storage device in the lithium-ion battery power supply module to remove the passivation film in the prior art, the embodiment of the application can send the activation signal to control the activation process of the lithium-ion battery through the control module, so that the activation process of the lithium-ion battery is in the controllable range of the control module, the activation effect of the lithium-ion battery can be improved, the lithium-ion battery can stably output a large current to supply power for the control module, the control signal output by the control module is more accurate, the ultrasonic transducer can be controlled through the transducer interface module to realize water flow measurement, and the accuracy of the control signal output by the control module is improved, so that the flow measurement result obtained through the ultrasonic transducer under the control of the control module is more accurate.

Drawings

FIG. 1 is a schematic circuit diagram of an intelligent water meter measurement circuit according to an embodiment of the present application;

fig. 2 is a schematic circuit diagram of a battery activation module according to an embodiment of the present application;

FIG. 3 is a schematic circuit diagram of a transducer interface module according to an embodiment of the present application;

FIG. 4 is a schematic circuit diagram of a battery voltage stabilizing module according to an embodiment of the present application;

fig. 5 is a schematic circuit diagram of a battery interface module according to an embodiment of the present application;

fig. 6 is a schematic circuit diagram of a battery capacity measurement module according to an embodiment of the present application;

fig. 7 is a schematic circuit diagram of a segment code screen power supply unit according to an embodiment of the present application;

FIG. 8 is a schematic circuit diagram of a segment code screen interface unit according to an embodiment of the present application;

FIG. 9 is a schematic circuit diagram of a memory module according to an embodiment of the present application;

FIG. 10 is a schematic circuit diagram of a user input module according to an embodiment of the present application;

FIG. 11 is a schematic circuit diagram of a reset unit according to an embodiment of the present application;

fig. 12 is a circuit schematic diagram of a communication control unit according to an embodiment of the present application;

fig. 13 is a schematic circuit diagram of a data transmitting unit according to an embodiment of the present application;

fig. 14 is a schematic circuit diagram of a network status indication unit according to an embodiment of the present application;

Fig. 15 is a schematic circuit diagram of a network status indication unit according to an embodiment of the present application;

FIG. 16 is a schematic circuit diagram of a control module according to an embodiment of the present application;

FIG. 17 is a block diagram of an intelligent water meter measurement circuit according to an embodiment of the present application;

FIG. 18 is a schematic diagram showing steps of a flow measurement method according to an embodiment of the present application;

fig. 19 is a schematic structural diagram of an intelligent water meter according to an embodiment of the present application.

Reference numerals: the intelligent water meter comprises an intelligent water meter measuring circuit 10, a control module 101, a battery activating module 102, a transducer interface module 103, a battery voltage stabilizing module 104, a battery interface module 105, a battery capacity measuring module 106, a display module 107, a storage module 108, a user input module 109, a communication module 110, a state indicating module 111 and an intelligent water meter 20.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the present application, fall within the scope of protection of the present application.

The following describes in detail the embodiments of the present application through specific embodiments and application scenarios thereof with reference to the accompanying drawings.

Fig. 1 shows a schematic circuit diagram of an intelligent water meter measurement circuit 10 according to an embodiment of the present application, as shown in fig. 1, including:

a control module 101;

a battery activation module 102 for removing the passivation film of the lithium-ion battery under the control of the activation signal sent by the control module 101;

a transducer interface module 103 for connecting an external ultrasonic transducer;

the control module 101 is electrically connected to the battery activation module 102 and the transducer interface module 103, respectively.

In the embodiment of the present application, the control module 101 may be a chip with an ultrasonic time difference measurement function, for example, a chip including a control unit and an ultrasonic time difference measurement unit, where the control unit may obtain measurement data, that is, echo signals, of the ultrasonic transducer on water flow by sending measurement signals to the transducer interface module 103 and switching signal pulse receiving and exciting channels of the ultrasonic transducer. The control unit can be used for configuring the ultrasonic time difference measuring unit, so that the ultrasonic time difference measuring unit can calculate the time difference according to the measuring signal and the echo signal, and a water flow measuring result is obtained.

In the embodiment of the present application, the control module 101 may generate an activation signal according to a preset activation signal transmission frequency or a battery activation time interval, and then transmit the activation signal to the battery activation module 102. The activation signal sending frequency or the battery activation time interval may be determined according to the passivation film generation time of the lithium-ion battery, and may be set by user definition, which is not limited in the embodiment of the present application.

In the embodiment of the application, the control module 101 can send the activation signal to the battery activation module 102 to control the battery activation module 102 to remove the passivation film of the lithium-ion battery, compared with the mode of arranging the energy storage device in the lithium-ion battery power supply module to remove the passivation film in the prior art, the embodiment of the application can control the activation process of the lithium-ion battery by sending the activation signal by the control module 101, so that the activation process of the lithium-ion battery is in the controllable range of the control module 101, the activation effect of the lithium-ion battery can be improved, the lithium-ion battery can stably output a large current to supply power to the control module 101, the control signal output by the control module 101 is more accurate, the ultrasonic transducer can be connected through the transducer interface module 103, and the water flow measurement can be realized through the ultrasonic transducer, because the accuracy of the control signal output by the control module 101 is improved, and therefore, the flow measurement result obtained through the ultrasonic transducer under the control of the control module 101 is also more accurate.

Optionally, the control module 101 specifically includes: an activation signal output;

the battery activation module 102 specifically includes: the first input end is used for receiving an activation signal, the first interface end is used for connecting the lithium-ion battery, and the first discharging unit;

the first input end is electrically connected with the activation signal output end and the first discharge unit respectively;

the first discharging unit is also electrically connected with the first interface end and is used for discharging and outputting the lithium-ion battery through the first interface end under the control of an activating signal.

In the embodiment of the application, the control module 101 may send the activation signal to the first input end of the battery activation module 102 through the activation signal output end, and then the first input end transmits the activation signal to the first discharge unit, and the first discharge unit may discharge the lithium-ion battery in response to the activation signal, so as to remove the passivation film of the lithium-ion battery, thereby activating the lithium-ion battery, so that the discharge process of the lithium-ion battery is within the controllable range of the control module 101, and the activation effect of the lithium-ion battery may be improved.

Optionally, the first discharge unit specifically includes: the first switch assembly, the grounding end and the first resistor;

the first switch component is electrically connected with the first input end, the first interface end and the first resistor respectively and is used for controlling the first interface end to be conducted with the first resistor when the activation signal is a preset level signal;

The first resistor is electrically connected between the first switch assembly and the ground terminal and is used for discharging and outputting the lithium-ion battery.

In the embodiment of the present application, the activation signal may be a switch control signal, which is used to control the opening or closing of the first switch component, for example, a high level signal or a low level signal. Under the condition that the first switch component is closed, the first interface end is conducted with the first resistor, the first resistor is further electrically connected with the grounding end, and therefore the lithium sub-battery can be discharged and output through the first resistor, the passivation film of the lithium sub-battery is removed, and the lithium sub-battery is activated. The activation frequency and the activation time of the lithium-ion battery can be controlled by controlling the on and off of the first switch component through the activation signal, so that the discharging process of the lithium-ion battery is in the controllable range of the control module, and the activation effect of the lithium-ion battery is improved.

Optionally, the first switch component is a first transistor;

the first transistor specifically includes: a control electrode, a first electrode, and a second electrode;

the first electrode is electrically connected with the first interface end, and the second electrode is electrically connected with the first resistor;

the control electrode is electrically connected with the first input end and is used for conducting the connection between the first electrode and the second electrode when the activating signal is a preset level signal and controlling the first interface end to be conducted with the first resistor.

In the embodiment of the present application, the first transistor may be a metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor Field Effect Transistor, MOSFET), i.e., a MOS transistor, where the first transistor may be an N-channel or P-channel MOS transistor, the first electrode may be a source or a drain, and the second electrode may be a drain or a source, which is not limited in this embodiment of the present application. The control electrode of the first transistor may be a gate electrode of an NMOS transistor or a PMOS transistor, and the first transistor may conduct connection between the first electrode and the second electrode when an activation signal input to the control electrode is a preset level signal, so as to conduct connection between the first interface terminal and the first resistor. The preset level signal may be determined by selecting an NMOS transistor or a PMOS transistor according to the first transistor, and specifically, the PMOS transistor is effective with a low level, where the preset level signal may be a low level signal, and the NMOS transistor is effective with a high level, where the preset level signal may be a high level signal. The examples are presented herein by way of illustration only and are not limiting in any way. Whether the lithium sub-battery is activated or not can be simply and conveniently controlled through the first transistor, and the circuit area cost can be reduced, so that the circuit power consumption is reduced.

Fig. 2 is a schematic circuit diagram of a battery activation module 102 according to an embodiment of the present application, as shown in fig. 2, VBAT represents a battery voltage (Voltage of Battery), a first interface end VBAT is used for connecting a lithium battery, vbat_fang is a first input end, Q4 is a PMOS transistor, that is, a first transistor according to an embodiment of the present application, R40 is a first resistor, and the battery activation module 102 further includes a diode D4, where the diode D4 is connected between the first interface end VBAT and a source of the PMOS transistor, so as to prevent current from flowing backward and avoid damaging the lithium battery. In fig. 2, the gate of the PMOS transistor is connected to the first interface terminal VBAT through the resistor R38 and the resistor 39, so that the power voltage signal output by the lithium-ion battery can be used as a high-level signal, the high-level signal is input to the gate of the PMOS transistor, so that the PMOS transistor can be kept in an off state, and when the activation signal input by the first input terminal vbat_fang is a low-level signal, the gate of the PMOS transistor can be pulled down to control the PMOS transistor to be turned on, thereby turning on the first interface terminal and the first resistor R40, discharging the lithium-ion battery, and removing the passivation film of the lithium-ion battery.

Optionally, the transducer interface module 103 specifically includes:

the device comprises a filtering unit, an impedance matching unit and an interface unit for connecting an ultrasonic transducer;

The filtering unit is electrically connected with the control module 101 and the interface unit respectively, and is used for filtering echo signals sent by the ultrasonic transducer received by the interface unit and sending the filtered echo signals to the control module 101;

the impedance matching unit is electrically connected with the control module 101 and the interface unit, respectively, and is used for performing impedance matching on the intelligent water meter measuring circuit 10 and the ultrasonic transducer.

In the embodiment of the present application, the filtering unit may include a band-pass filter, where the center frequency of the band-pass filter may be determined according to the center frequency of the ultrasonic transducer connected to the ultrasonic interface module 103, so that the echo signal returned by the ultrasonic transducer through the ultrasonic interface module 103 may be filtered by the band-pass filter, that is, the signals with the remaining frequencies are filtered, so as to improve the signal quality of the echo signal, and make the flow measurement result determined according to the measurement signal and the echo signal more accurate.

In the embodiment of the application, the filtering unit may include a filtering capacitor and an anti-interference resistor, where the filtering capacitor is electrically connected with the control module 101 and the interface unit, and the anti-interference resistor is connected in parallel with the filtering capacitor, where the anti-interference resistor may be a resistor of 0 ohm (Ω), and the resistor of 0 Ω may provide a shorter reflux path to reduce interference. The impedance matching unit may include at least one second resistor, where the second resistor is electrically connected to the control module 101 and the interface unit, and by setting the resistance of the second resistor, the impedance of the ultrasonic transducer connected to the intelligent water meter measurement circuit and the ultrasonic interface module is matched, and by impedance matching, the integrity of the ultrasonic signal can be improved, that is, the waveform is guaranteed to be generated and transmitted without deformation. If impedance matching is not performed, the transmitting end of the ultrasonic transducer transmits a sine wave, the receiving end may receive a sine wave, and the waveform may be distorted in the time domain or the overall amplitude may be changed. The impedance matching unit can be connected with ultrasonic transducers of different types, so that the expandability of the intelligent water meter measuring circuit 10 is improved, the quality of echo signals returned by the ultrasonic transducers can be improved through the filtering unit, the echo signals are more accurate, and the accuracy of flow measuring results is further improved.

Fig. 3 is a schematic circuit diagram of a transducer interface module 103 according to an embodiment of the present application, as shown in fig. 3, a filter capacitor C43 and an anti-interference resistor R26 form a filter unit, and are electrically connected to a STOP1 pin of a control module 101 and a jumper interface JP4 in the interface unit, where the impedance matching unit includes a resistor R27, the filter capacitor C43 and the anti-interference resistor R26, the resistor R27 is electrically connected to a FIRE1 pin of the control module 101 and the jumper interface JP4, and the interface unit further includes a jumper interface JP3, and may be connected to a transceiver port of an ultrasonic transducer through the jumper interface JP4 and the jumper interface JP 3. Since the echo signal is an ac signal, the filter capacitor C43 also exhibits a resistive characteristic, and the impedance matching unit also includes the filter capacitor C43. The transducer interface module 103 may be connected to different ultrasonic transducers through different impedance matches, and more transducer interface modules 103 may be configured according to the number and parameters of the connected ultrasonic transducers, which is not limited in this embodiment of the present application. For example, pins FIRE1 and FIRE2 of the control module 101 may be connected to different types of ultrasonic transducers through impedance matching, and when ultrasonic flow measurement is performed, the FIRE1 may be connected to a transducer driving circuit in the control module 101 through a multiple-way switch in the control module 101, and FIRE2 may be connected to a multi-stage small signal conditioning circuit in the control module 101, where when the ultrasonic signal needs to be commutated, only the multiple-way switch needs to be switched. It should be noted that, in the transducer interface module 103, when different impedance matches are connected to different ultrasonic transducers, the signal lines should be designed to have equal lengths, so that measurement errors can be avoided from being introduced in the electrical layer, and compensation and correction of the errors are also facilitated.

Optionally, the intelligent water meter measurement circuit 10 further includes: a battery voltage stabilizing module 104;

the battery voltage stabilizing module 104 specifically includes: the voltage stabilizing unit and the testing unit;

the control module 101 specifically further includes: a power signal input terminal;

the voltage stabilizing unit is arranged between the lithium battery and the control module 101 and is used for stabilizing the power supply voltage signal output by the lithium battery and sending the stabilized power supply voltage signal to the power supply signal input end;

the test unit is connected with the voltage stabilizing unit in parallel and is used for carrying out short circuit control on the voltage stabilizing unit during test.

In the embodiment of the application, the voltage stabilizing unit can comprise a low dropout voltage stabilizing (Low Dropout Regulator, LDO) chip, and the LDO chip has the advantage of low power consumption, can avoid greatly increasing the power consumption of an intelligent water meter measuring circuit while stabilizing the power voltage signal output by the lithium-ion battery, and is suitable for the application scene of the intelligent water meter. The output voltage of the voltage stabilizing unit may be set according to the power supply voltage requirement of the control module 101, for example, 3.3 volts (V) or 1.8V, and the voltage stabilizing unit receives the power supply voltage signal output by the lithium secondary battery, and stabilizes the power supply voltage signal and outputs the power supply voltage of the voltage value meeting the requirement of the control module 101 to the power supply signal input end of the control module 101, so as to supply power to the control module 101.

In the embodiment of the application, the test unit may include a third resistor and a second switch component connected in series, and when the second switch component is closed, the voltage stabilizing unit is shorted by the third resistor, so that the influence of the voltage stabilizing unit on the measurement accuracy can be compared and analyzed according to the difference of the flow measurement results obtained by the control module 101 before and after the voltage stabilizing unit is shorted. The voltage stabilizing unit can stabilize the power supply voltage signal output by the lithium-ion battery, so that the stability of the power supply voltage of the control module 101 is improved.

Fig. 4 is a circuit schematic diagram of a battery voltage stabilizing module 104 provided in the embodiment of the present application, as shown in fig. 4, U6 is a low dropout voltage stabilizing chip, i.e. a voltage stabilizing unit, input ends 1 and 3 of the chip U6 are used for connecting with a lithium sub-battery, an output end 5 is used for connecting with a 3.3V power signal input end of the control module 101, and an input end filtering component composed of capacitors C40 and C41 is disposed between the chip U6 and the lithium sub-battery to filter an input signal of the voltage stabilizing unit. An output end filter assembly composed of capacitors C35 and C36 is arranged between the chip U6 and the lithium sub-control module 101, and the output signal of the voltage stabilizing unit is filtered. The test unit includes a resistor R47, and when the voltage stabilizing unit needs to be tested, the resistor R47 can be welded between the input end and the output end of the chip U6, so that the chip U6 is short-circuited.

Optionally, the intelligent water meter measurement circuit 10 further includes: the battery interface module 105 is used for protecting the intelligent water meter measurement circuit 10, and is electrically connected with the lithium-ion battery, the battery activation module 102 and the battery voltage stabilizing module 104 respectively.

In an embodiment of the present application, the battery interface module 105 may include a multi-way connector and an electrostatic protection unit. The lithium-ion battery is respectively connected with the battery activation module 102 and the battery voltage stabilizing module 104 through the multipath connector, and the multipath connector can be connected with different energy loops, so that the circuit design is optimized, and the loop misconnection risk is eliminated. The electrostatic protection unit can protect the intelligent water meter measuring circuit 10, and damage to circuit elements caused by static electricity generated after the lithium ion battery is connected into the intelligent water meter measuring circuit 10 is avoided.

Fig. 5 is a schematic circuit diagram of the battery interface module 105 according to an embodiment of the present application, and as shown in fig. 5, the battery interface module 105 may include a multiplexer JP8, a diac D6, i.e., an electrostatic protection unit, and filter capacitors C47 and C48. Wherein JP8 includes 1 and 2 jumper interfaces that can be used to connect the battery activation module 102 and the battery voltage regulator module 104, respectively. The bidirectional breakdown diode D6 can perform electrostatic protection, meets the electrostatic discharge (ESD) protection requirement, avoids electrostatic damage to circuit elements, and improves the service life of the intelligent water meter measurement circuit 10.

Optionally, the intelligent water meter measurement circuit 10 further includes: a battery capacity measurement module 106;

the battery capacity measurement module 106 specifically includes: a second input end for receiving a voltage acquisition signal sent by the control module 101, a second interface end for connecting the lithium-ion battery, a second switch unit and a first output end for sending a power supply voltage signal output by the lithium-ion battery to the control module 101;

the second input end is electrically connected with the control module 101 and the second switch unit respectively;

the second switch unit is electrically connected with the second interface end and the first output end respectively and is used for conducting connection between the second interface end and the first output end under the condition that the voltage acquisition signal is a preset level signal;

the control module 101 is also configured to determine a battery capacity of the lithium-ion battery based on the supply voltage signal.

In the embodiment of the present application, the second input end may be configured to receive the voltage acquisition signal sent by the control module 101, and transmit the voltage acquisition signal to the second switch unit. The voltage acquisition signal can be a high-level signal or a low-level signal and is used for controlling the on or off of the second switch unit so as to control whether the connection between the second interface terminal and the first output terminal is conducted or not. The second switching unit may be a second transistor, a first electrode of the second transistor is electrically connected to the second interface terminal, a second electrode of the second transistor is electrically connected to the first output terminal, and a control electrode of the second transistor is electrically connected to the second input terminal. The second transistor may be an NMOS transistor or a PMOS transistor, the first electrode may be a source or a drain, and the second electrode may be a drain or a source, which is not limited in this embodiment of the present application. The control electrode of the second transistor may be a gate electrode of an NMOS transistor or a PMOS transistor, and the second transistor may be used to conduct connection between the first electrode and the second electrode when the voltage acquisition signal input to the control electrode is a preset level signal, so as to conduct connection between the second interface end and the first output end, so that the control module 101 may acquire a power supply voltage signal of the lithium battery from the first output end, and further perform battery capacity measurement on the lithium battery according to the power supply voltage signal. The preset level signal may be determined by selecting an NMOS transistor or a PMOS transistor according to the second transistor, and specifically, the PMOS transistor is effective with a low level, and the preset level signal may be a low level signal, while the NMOS transistor is effective with a high level, and the preset level signal may be a high level signal. The examples are presented herein by way of illustration only and are not limiting in any way.

In the embodiment of the application, a comparison table of the power voltage signal and the battery capacity of the lithium-ion battery can be established in advance by carrying out discharge test on the lithium-ion battery, and then the current battery capacity of the lithium-ion battery can be determined by looking up a table according to the current power voltage signal. The discharging test may be to send a voltage collecting signal to the battery capacity collecting module 106 through the control module 101 according to a preset collecting time interval, control the second switch unit to be closed, conduct the second interface end and the first output end, then obtain a power voltage signal of the lithium sub-battery, obtain a discharging graph with the battery capacity as an abscissa and the power voltage signal as an ordinate through multiple discharging tests, and thus obtain battery capacities corresponding to different power voltage signals. It should be noted that, in the constant current charging and discharging process, the voltage is continuously changed along with the change of the charging and discharging depth (residual capacity), so the battery capacity can be measured by collecting the power supply voltage signal. Thus, the battery capacity of the lithium-ion battery can be measured by the battery capacity measuring module 106, so that the battery state of the lithium-ion battery can be obtained, and the practicability of the intelligent water meter measuring circuit 10 is improved.

Fig. 6 is a circuit schematic diagram of a battery capacity measurement module 106 provided in an embodiment of the present application, as shown in fig. 6, Q3 is a PMOS transistor, that is, a second transistor in an embodiment of the present application, a gate of the PMOS transistor is connected to a second interface terminal through a resistor R33 and a resistor R34, and a second interface terminal VBAT is used for connecting a lithium sub-battery, so that a power supply voltage signal output by the lithium sub-battery can be used as a high level signal, the high level signal is input to the gate of the PMOS transistor, so that the PMOS transistor can be kept in an off state, and when a voltage acquisition signal input by a second input terminal vbat_pin is a low level signal, the PMOS transistor can be controlled to be turned on, so that the second interface terminal is turned on with a resistor R35, the power supply voltage signal output by the lithium sub-battery can be transmitted to a first output terminal through the PMOS transistor Q3, the resistors R35 and R36, and the first output terminal is connected to an analog-digital conversion PIN adc_bat of the control module 101, so that the control module 101 can acquire the power supply voltage signal, and then determine the battery capacity of the lithium sub-battery according to the power supply voltage signal. In fig. 6, filter capacitors C49 and C50 are included, and a resistor R37 is connected in parallel with the filter capacitor C50.

Optionally, the intelligent water meter measurement circuit 10 further includes: a display module 107; the display module 107 specifically includes: the device comprises a segment code display screen, a Duan Mabing power supply unit and a Duan Mabing interface unit;

The segment code screen power supply unit is electrically connected with the control module 101 and the segment code display screen respectively;

the segment code screen interface unit is electrically connected with the control module 101 and the segment code display screen respectively.

In the embodiment of the present application, the segment code screen power supply unit may be configured to receive the display control signal sent by the control module 101, and respond to the display control signal to supply power to the segment code display screen. The section code screen power supply unit can include third switch module and be used for connecting the third interface end of lithium inferior battery, and third switch module can be connected with the power supply end of third interface end and section code display screen electricity respectively, can switch on or close through the control signal control third switch module of demonstration to whether control section code screen power supply unit supplies power to the section code display screen. The third switch component may be a MOS transistor, and the type selection and connection manner of the MOS transistor may refer to the description related to the second switch component in the foregoing embodiment, which is not repeated herein. The flow measurement result can be displayed through the display module 107, so that the user can check conveniently, and the practicability of the circuit can be improved.

Fig. 7 is a circuit schematic diagram of a segment code screen power supply unit provided by the embodiment of the application, as shown in fig. 7, Q5 is a PMOS tube, that is, a third switch component of the embodiment of the application, a gate of the PMOS tube is connected to a third interface terminal vdda_3v3 through a resistor R5 and a resistor R7, and is used for connecting a lithium sub-battery or a voltage stabilizing module to obtain a power supply voltage of 3.3V, so that a power supply voltage signal can be used as a high level signal, the high level signal is input to the gate of the PMOS tube, and the PMOS tube can be kept in an off state, and when an input terminal lcd_pin inputs a display control signal to be a low level signal, the PMOS tube can be controlled to be turned on, so that the third interface terminal is turned on with an output terminal of the Duan Mabing power supply unit, thereby supplying power to the segment code display screen. In fig. 7, the segment code screen power supply unit further includes a voltage dividing circuit composed of resistors R41 to 44 and capacitors C8 to 10, and voltage acquisition points VLCD1, 2, 3, where the voltage acquisition points are connected to the control module 101, and the control module 101 determines the power supply voltage of the segment code screen power supply unit according to the acquired voltage.

In the embodiment of the application, the Segment code screen interface unit can comprise 4 serial communication ports (cluster communication port, COM), 24 digital tube (SEG) ports, and can drive a Segment code display screen with 96 segments or more to display flow measurement results. The ports of the segment code screen interface unit may be connected to corresponding display transmission ports in the control module 101, and are configured to receive the flow measurement result sent by the control module 101 through the display transmission ports, and then send the flow measurement result to the segment code display screen for display.

Fig. 8 is a circuit schematic diagram of a segment code screen interface unit according to an embodiment of the present application, where, as shown in fig. 8, the segment code screen interface unit includes 4 COM ports: LCD_COM0-3, 19 nixie tubes SEG ports: SEGs 0-18, wherein SEGs 15-18 may be used as software debug interfaces (Enhanced Joint Test Action Group, EJTAG) to interface with JTAG clock interfaces (TCK), reset interfaces (TRST), test data input interfaces (TDI), and test data output interfaces (TDO).

Optionally, the intelligent water meter measurement circuit 10 further includes: a storage module 108;

the storage module 108 specifically includes: a third switching unit and a storage unit;

the third switch unit is electrically connected with the control module 101 and the storage unit respectively, and is used for receiving the storage control signal sent by the control module 101, and when the storage control signal is a preset level signal, the connection between the storage unit and the lithium ion battery is conducted, so that the storage module is started.

In the embodiment of the present application, the storage unit may be a Flash Memory (Flash Memory), and the control module 101 may import and store data of the flow measurement result, such as the accumulated flow, the instantaneous flow rate, etc., into the Flash Memory. In addition, the control module 101 may send a storage control signal to the third switch unit to control the on or off of the third switch unit, so as to control the on or off of the lithium-ion battery or the battery voltage stabilizing module 104 and the power supply end of the storage unit, so that whether the storage module starts working or not can be controlled by the storage control signal. The third switching unit may be a third transistor, where a control electrode of the third transistor is electrically connected to the control module 101 and is configured to receive the storage control signal, a first electrode of the third transistor is electrically connected to the lithium-ion battery or the battery voltage stabilizing module 104, and a first electrode of the third transistor is electrically connected to a power supply terminal of the memory unit. Specifically, the third transistor may be a PMOS transistor or an NMOS transistor, which is not limited in this embodiment of the present application, and may control the on or off of the first pole and the second pole of the third transistor according to the high or low level of the display control signal, so as to control the on or off of the lithium battery or the battery voltage stabilizing module 104 and the power supply terminal of the memory cell. The flow measurement result can be stored through the storage module 108, so that a user can acquire historical flow data of the intelligent water meter to perform relevant data analysis, and the practicability of the circuit is improved.

Fig. 9 is a circuit schematic diagram of a memory module 108 provided in this embodiment of the present application, as shown in fig. 9, where the memory module 108 includes a memory unit U7 and a third switch unit Q6, the third switch unit Q6 is a PMOS tube, a gate of the PMOS tube is connected to an interface terminal vcc_3v3 through a resistor R14 and a resistor R9, and is used to connect a lithium battery or a voltage stabilizing module to obtain a supply voltage of 3.3V, so that a supply voltage signal can be used as a high level signal, the high level signal is input to the gate of the PMOS tube, and the PMOS tube can be kept in an off state, and when a memory control signal sent by an input terminal flash_pin input control module is a low level signal, the PMOS tube can be controlled to be turned on, so that the interface terminal vcc_3v3 is turned on with a power supply terminal VDD of the memory unit U7, so that the memory module is started. Memory unit U7 also includes serial peripheral interfaces (Serial Peripheral Interface, SPI) spi_csm0, spi_miso, spi_clk, and spi_csmi, which may be correspondingly connected to the SPI interfaces of control module 101, to transmit flow measurements over the serial channel. Note that MISO is a master input/slave output pin, and MOSI is a master output/slave input pin. In fig. 9, pins 3, 7 and 8 of memory cell U7 also receive vcc_flash voltage through resistor R29, resistor R47 and resistor R55, respectively.

Optionally, the intelligent water meter measurement circuit 10 further includes: the user input module 109, the user input module 109 specifically includes: the device comprises a key unit, a capacitor unit, a resistor unit, a grounding end and a signal output end;

the capacitor unit is electrically connected with the resistor unit and the grounding end respectively and is also connected with the key unit in parallel;

a lead wire is led out between the capacitor unit and the resistor power supply and is electrically connected with the signal output end;

the signal output is also electrically connected to the control module 101.

In the embodiment of the application, the resistance unit can be connected with the lithium battery or the voltage stabilizing module and then connected with the capacitance unit in series, the capacitance unit is also electrically connected with the grounding end, the key unit is connected with the capacitance unit in parallel, the resistance unit is used as a pull-up resistor, when the key unit is not pressed down, the signal output end outputs a high-level signal, and when the key unit is pressed down, the capacitance unit is short-circuited, and the signal output end is directly electrically connected with the grounding end, so that the signal output end outputs a low-level signal. The control module 101 may determine the user input action according to the signal sent by the signal output end, and further execute the corresponding operation according to the user input action. The capacitor unit is used for reducing the influence of mechanical jitter, if the key unit is pressed down, the capacitor unit is short-circuited, the capacitor unit discharges rapidly (the short circuit can be regarded as a load with small resistance) and then enters a stable state, and when the key unit is released, the capacitor unit needs to be charged through the resistor unit, so that the charging rate can be slowed down, and the key unit jitter can be eliminated.

In the embodiment of the application, the key unit is provided for user interaction, a user can dynamically switch the segment code display screen to display different display contents in a triggering mode of clicking, double clicking, long pressing and the like, and if the error curve of the intelligent water meter is required to be corrected, the key can be pressed for a long time to enter a water meter verification mode, and the calibration of related numbers is carried out.

Fig. 10 is a circuit schematic diagram of a user input module 109 according to an embodiment of the present application, as shown in fig. 10, SW2 is a tact switch, that is, a KEY unit according to an embodiment of the present application, the resistor unit includes a resistor R32, and may be connected to a lithium battery or a voltage stabilizing module to obtain a power supply voltage of 3.3V, the capacitor power supply includes a capacitor C46, the capacitor C46 is further electrically connected to a ground terminal, a lead wire between the capacitor C46 and the resistor R32 is connected to a signal output terminal key_i, and in fig. 10, the capacitor C46 is further connected in parallel to a bidirectional breakdown diode D5 for electrostatic protection, so as to avoid damage to circuit elements.

Optionally, the intelligent water meter measurement circuit 10 further includes: a communication module 110; the communication module 110 specifically includes: the cloud server comprises a communication control unit, a reset unit and a data transmission unit, wherein the data transmission unit is used for connecting with the cloud server;

the communication control unit is electrically connected with the control module 101 and the data transmission unit respectively;

The reset unit is electrically connected to the control module 101 and the communication control unit, respectively.

In the embodiment of the application, the reset unit comprises a fourth switch component, a signal input end and a reset output end, wherein the signal input end is respectively and electrically connected with the control module 101 and the fourth switch component, and is used for receiving a reset control signal of the control module 101 and transmitting the reset control signal to the fourth switch component, and the fourth switch component is also electrically connected with the grounding end and the reset output end. The communication module 110 can upload the flow measurement result to the cloud server, and can also access the internet of things, so that the user experience is improved.

Fig. 11 is a schematic circuit diagram of a RESET unit provided in an embodiment of the present application, as shown in fig. 11, a fourth switch component Q1 is an NMOS transistor, a gate of the NMOS transistor is connected to a signal input terminal module_reset through a resistor R22, and is used for receiving a RESET control signal sent by the control MODULE 101, and a gate of the NMOS transistor is further connected to a ground terminal through a resistor R24, so when the RESET control signal is a low level signal, the low level signal is input to the gate of the NMOS transistor, and when the RESET control signal is a high level signal, the high level signal is input to the gate of the NMOS transistor, and can control the NMOS transistor to be turned on, so that the RESET output terminal nb_reset is pulled low, and the RESET output terminal nb_reset can be electrically connected to the RESET terminal of the communication control unit, and is used for resetting the communication control unit.

In the embodiment of the application, the communication control unit can be a narrow-band internet of things (Narrow Band Internet of Things, NB-IoT) module, and supports cellular data connection of the low-power-consumption device in the wide area network. The data transmission unit may be a universal subscriber identity card (Universal Subscriber Identity Module, USIM) circuit. The examples are presented herein by way of illustration only and are not limiting in any way.

Fig. 12 is a circuit schematic of a communication control unit according to an embodiment of the present application, where, as shown in fig. 12, the communication control unit includes pins main_rxd and main_txd electrically connected to a data transceiver interface in the control module 101, for transmitting a flow measurement result. The pin nb_reset of the communication control unit may be electrically connected to the RESET unit, for receiving a RESET signal transmitted by the RESET unit. Pins usim_data, usim_rst, and usim_clk of the communication control unit may be electrically connected with corresponding interfaces of the DATA transmission unit (USIM card circuit), respectively, for transmitting the flow measurement result to the DATA transmission unit. The communication control unit is connected with the radio frequency component RF1 through the antenna pin RF_ANT and is used for transmitting a flow measurement result to the cloud server through the radio frequency component RF 1.

Fig. 13 is a schematic circuit diagram of a DATA sending unit provided in an embodiment of the present application, as shown in fig. 13, U2 is a USIM chip, a 3 pin of the USIM chip is electrically connected with a usim_data pin of a communication control unit, a 7 pin of the USIM chip is electrically connected with a usim_rst pin of the communication control unit, a 6 pin of the USIM chip is electrically connected with a usim_clk pin of the communication control unit, and the DATA sending unit further includes bidirectional breakdown diodes D2, D3 and D4 for electrostatic protection, so as to avoid damage to circuit elements.

Optionally, the intelligent water meter measurement circuit 10 further includes: the status indication module 111, the status indication module 111 specifically includes: a network status indication unit and a system status indication unit;

the network state indicating unit is electrically connected with the communication control unit;

the system status indication unit is electrically connected to the control module 101.

In the embodiment of the present application, the network status indication unit is configured to indicate the current network connection status of the communication module 110, and may include a fifth switch component and a light emitting diode (Light Emitting Diode, LED), where the light emitting diode may be electrically connected to the lithium-ion battery or the battery voltage stabilizing module 104, and the fifth switch component may be electrically connected to the status signal interface of the communication control unit, and is configured to, in response to a network status signal sent by the communication control unit through the status signal interface, conduct connection between the light emitting diode and the ground terminal, so that the light emitting diode works and output a network status signal. The current network state and the system operating state of the intelligent water meter measuring circuit 10 can be conveniently displayed through the state indicating module 111, and the user interactivity of the intelligent water meter can be improved.

Fig. 14 is a circuit schematic diagram of a network status indication unit provided in an embodiment of the present application, as shown in fig. 14, the fifth switch component Q2 is an NMOS tube, a gate of the NMOS tube Q2 is connected to a status signal interface NETLIGHT through a resistor R23, and is used for receiving a network status signal sent by a communication control unit, and a gate of the NMOS tube Q2 is further connected to a ground terminal through a resistor R25, so that when the network status signal is a low level signal, the low level signal is input to the gate of the NMOS tube, the NMOS tube can be kept in an off state, and when the network status signal is a high level signal, the high level signal is input to the gate of the NMOS tube, the NMOS tube can be controlled to be turned on, and the resistor R21 is connected to the ground terminal, so that the light emitting diode LED2 works, and outputs a network status signal, such as a red light signal.

In the embodiment of the present application, the system status indication unit is configured to indicate the current system working status of the control module 101, and may include a light emitting diode (Light Emitting Diode, LED), where the light emitting diode may be electrically connected to the lithium-ion battery or the battery voltage stabilizing module 104, and the light emitting diode may also be electrically connected to the working status signal interface led_state of the control module 101, and configured to receive the system status signal sent by the control module 101, so that the light emitting diode works and output the system status signal.

For example, a network status indicator light: the lights are on for 64ms and off for 800ms, which indicate the network searching state after the communication module 110 is normally started, and the lights are on for 64ms and off for 2000ms, which indicate that the communication module 110 is registered to the network and is in a connection state, and the lights are always off, which indicate that the communication module 110 is in other states. System status indicator lamp: the lights are on for 1000ms and off for 1000ms, which means that the control module 101 is in a normal working state, and the lights are on for 500ms and off for 1000ms, which means that the control module 101 is in a water meter verification state. The examples are presented herein by way of illustration only and are not limiting in any way.

Fig. 15 is a circuit schematic diagram of a network status indication unit according to an embodiment of the present application, as shown in fig. 15, a light emitting diode LED2 is electrically connected to an operating status signal interface led_stage of a control module 101, and is configured to receive a system status signal sent by the control module 101, and output a system status signal, for example, output a red light signal.

Fig. 16 is a schematic circuit diagram of a control module 101 provided in an embodiment of the present application, as shown in fig. 16, the control module 101 includes a chip U1A, PINs FIRE1, FIRE2, STOP1 and STOP2 of the chip U1A are respectively electrically connected with corresponding PINs in the transducer interface module 103, PINs adc_bat are electrically connected with a first output terminal of the battery capacity measurement module 106, PINs spi_csm0, spi_miso, spi_clk and spi_csmi are respectively electrically connected with corresponding PINs of the storage unit U7, PIN vccnb_pin is electrically connected with a power control PIN of the communication control unit, PIN key_i is electrically connected with a signal output terminal of the user input module 109, PINs main_rxd and main_txd are respectively electrically connected with corresponding PINs of the communication control unit, and UART0 and UART1 can be used as a correction parameter configuration interface, a configuration of a log, and a deriving interface of the ultrasonic intelligent water meter. The PIN BS0 is a PIN related to the chip start mode, the PIN flash_pin is electrically connected with a corresponding PIN of the FLASH memory unit U7, the PIN vbat_pin is electrically connected with a corresponding PIN of the battery capacity measurement MODULE 106, the PIN led_state is electrically connected with a corresponding PIN of the system status display unit, the PIN vbat_fang is electrically connected with a corresponding PIN of the battery activation MODULE 102, the PIN module_reset is electrically connected with a corresponding PIN of the RESET unit, the PIN lcd_pin is electrically connected with a corresponding PIN of the Duan Mabing power supply unit, and the PIN dotesn is a chip specific test mode configuration PIN, and enters a chip test mode after a low level is set. The control module 101 further comprises a low power consumption debugging circuit special for the micro control unit (Microcontroller Unit, MCU), the low power consumption debugging circuit special for the MCU is connected with pins 43-46 of the chip U1A and comprises resistors R46, R48, R49, R10 and R12, wherein the resistors R46, R48 and R49 are 0 omega, peripheral equipment is closed and an idle pin of the chip U1A is set to be in an input state during debugging, so that no current is consumed, and the function of the resistors is to be pulled down to the ground.

It should be noted that, in the actual scenario, the chip U1A in fig. 16 has many unused General-purpose input/output interfaces (GPIOs), and if not set, a large leakage current is generated, thereby affecting the overall power consumption. The external circuit of the chip U1A can be configured as an analog input, so that the generation of leakage current is avoided, and the consumption of an internal input Schmitt trigger is reduced. The chip U1A can integrate an infrared transceiver, an instrument Bus controller (M-BUS) and a digital Time measurement unit (Time-to-Digital converter, TDC) inside, so that the trouble of hanging the chip is avoided, and the size of a board card of the intelligent water Meter is reduced. The collected flow measurement result can be used as a key through unique codes in the chip and automatically generated 4-bit random numbers, the flow measurement result is encrypted by utilizing a symmetric encryption algorithm and then transmitted to a cloud server, and the data security of the intelligent water meter is improved. Besides, the chip U1A can monitor some abnormal states of the intelligent water meter, such as whether a capacitance or echo measurement detection transducer is on line or whether resistance or echo detection is in an empty pipe state or not, and whether countercurrent phenomenon exists or not is judged by echo data. The present embodiments are to be considered in all respects as illustrative and not restrictive.

Fig. 17 is a block diagram of an intelligent water meter measurement circuit 10 according to an embodiment of the present application, and as shown in fig. 17, the intelligent water meter measurement circuit 10 includes: a control module 101, a battery activation module 102, a transducer interface module 103, a battery voltage stabilization module 104, a battery interface module 105, a battery capacity measurement module 106, a display module 107, a storage module 108, a user input module 109, a communication module 110, and a status indication module 111.

Fig. 18 is a schematic step diagram of a flow measurement method according to an embodiment of the present application, and as shown in fig. 18, the flow measurement method is applied to the intelligent water meter measurement circuit 10 according to the foregoing embodiment, and the intelligent water meter measurement circuit 10 includes: a control module 101, a battery activation module 102, and a transducer interface module 103; the method comprises the following steps:

in step S1, an activation signal is sent to the battery activation module 102 through the control module 101.

In step S2, the passivation film of the lithium-ion battery is removed by the battery activation module 102 in response to the activation signal.

In the embodiment of the application, the battery activation module 102 receives the activation signal and can respond to the activation signal to remove the passivation film in a discharge mode of the external resistor, so that the lithium-ion battery is activated, and the lithium-ion battery can output stable large current to supply power for the intelligent water meter measuring circuit.

Optionally, the control module specifically includes: an activation signal output; the battery activation module specifically includes: the first input end, the first interface end, the grounding end and the first discharge unit; removing, by the battery activation module in response to the activation signal, the passivation film of the lithium-ion battery, comprising:

receiving an activation signal sent by an activation signal output end through a first input end, and sending the activation signal to a first discharge unit;

and responding to the activation signal through the first discharging unit, and discharging and outputting the lithium-ion battery through the first interface terminal.

Optionally, the first discharge unit specifically includes: a first switch assembly and a first resistor; responding to the activation signal through the first discharging unit, discharging and outputting the lithium-ion battery through the first interface end, and the method comprises the following steps:

when the activation signal is a preset level signal, the first switch component controls the first interface end to be conducted with the first resistor;

and the lithium-ion battery is electrically connected with the grounding end through the first resistor to discharge and output.

In the embodiment of the application, the activation signal can be a switch control signal for controlling the opening or closing of the first switch assembly, the first interface end is conducted with the first resistor under the condition that the first switch assembly is closed, and the first resistor is electrically connected with the grounding end, so that the lithium sub-battery can be discharged through the first resistor, the passivation film of the lithium sub-battery is removed, the lithium sub-battery is activated, and the activation of the lithium sub-battery can be realized only by the first switch assembly and the first resistor.

Optionally, the first switch component is a first transistor, and the first transistor specifically includes: a control electrode, a first electrode, and a second electrode; the first switch assembly is used for controlling the first interface end to be conducted with the first resistor when the activation signal is a preset level signal, and the method comprises the following steps:

when the activation signal is a preset level signal, the control electrode of the first transistor controls the first interface end to be conducted with the first resistor when the connection between the first electrode and the second electrode is conducted.

In the embodiment of the application, the first transistor can conduct the connection between the first electrode and the second electrode under the condition that the activation signal input to the control electrode is a preset level signal, so as to conduct the connection between the first interface end and the first resistor. The preset level signal may be determined by selecting an NMOS transistor or a PMOS transistor according to the first transistor, and specifically, the PMOS transistor is effective with a low level, where the preset level signal may be a low level signal, and the NMOS transistor is effective with a high level, where the preset level signal may be a high level signal. The examples are presented herein by way of illustration only and are not limiting in any way. Whether the lithium sub-battery is activated or not can be simply and conveniently controlled through the first transistor, and the circuit area cost can be reduced, so that the circuit power consumption is reduced.

Step S3, sending a measurement signal to the transducer interface module 103 via the control module 101.

Step S4, transmitting the measurement signal to the ultrasonic transducer through the transducer interface module 103, receiving the echo signal transmitted by the ultrasonic transducer, and transmitting the measurement data to the control module 101; the measuring signal is used for controlling the ultrasonic transducer to perform flow measurement and obtain an echo signal.

Step S5, determining, by the control module 101, a flow measurement result from the measurement signal and the echo signal.

In an embodiment of the present application, the measurement signal may include an ultrasonic transducer parameter for instructing the ultrasonic transducer to perform flow measurement, and obtain an echo signal. For example, the measurement signal may be an ultrasonic pulse signal, and the ultrasonic transducer converts the electrical output into a vibration output according to the ultrasonic pulse signal to acquire the echo signal. The ultrasonic waves emitted by the ultrasonic transducer form echoes after encountering an obstacle, and the echoes are converted into electric pulses, namely echo signals, at the tail end of the ultrasonic transducer. The ultrasonic transducer returns an echo signal to the transducer interface module, the transducer interface module sends the echo signal to the control module 101, the control module 101 can calculate the forward flow and backward flow propagation time difference of the ultrasonic wave sent by the ultrasonic transducer in the water flow according to the echo signal and the measurement signal to indirectly measure the flow velocity of the water flow, and then the flow is calculated through the flow velocity, so that a flow measurement result is obtained.

Optionally, the intelligent water meter measurement circuit further includes: a battery voltage stabilizing module; the battery voltage stabilizing module specifically comprises: the voltage stabilizing unit and the testing unit; the control module specifically further comprises: a power signal input terminal; the method further comprises the steps of:

The power supply voltage signal output by the lithium-ion battery is received through the voltage stabilizing unit, the power supply voltage signal is stabilized, and the stabilized power supply voltage signal is sent to the power supply signal input end.

In the embodiment of the application, the voltage stabilizing unit can comprise a low-dropout voltage stabilizing chip. The output voltage of the voltage stabilizing unit may be set according to the power supply voltage requirement of the control module 101, for example, 3.3V or 1.8V, and the voltage stabilizing unit receives the power supply voltage signal output by the lithium-ion battery, stabilizes the power supply voltage signal, and outputs the power supply voltage with the voltage value meeting the requirement of the control module 101 to the power supply signal input end of the control module 101, so as to supply power to the control module 101. The voltage stabilizing unit can stabilize the power supply voltage signal output by the lithium-ion battery, so that the stability of the power supply voltage of the control module 101 is improved. The LDO chip has the advantage of low power consumption, can avoid greatly increasing the power consumption of the intelligent water meter measuring circuit while stabilizing the voltage of the power supply voltage signal output by the lithium battery, and is suitable for the application scene of the intelligent water meter.

the battery capacity measurement module 106 specifically includes: a second input end for receiving a voltage acquisition signal sent by the control module 101, a second interface end for connecting the lithium-ion battery, a second switch unit and a first output end for sending a power supply voltage signal output by the lithium-ion battery to the control module 101; the flow measurement method further comprises the following steps:

Transmitting a voltage acquisition signal to the battery capacity measurement module 106 through the control module 101;

receiving a voltage acquisition signal through a second input end and transmitting the voltage acquisition signal to a second switch unit;

under the condition that the voltage acquisition signal is a preset level signal, the second switching unit is used for conducting connection between the second interface end and the first output end;

the power supply voltage signal sent by the first output terminal is received by the control module 101, and the battery capacity of the lithium-ion battery is determined according to the power supply voltage signal.

In the embodiment of the application, a comparison table of the power voltage signal and the battery capacity of the lithium-ion battery can be established in advance by carrying out discharge test on the lithium-ion battery, and then the current battery capacity of the lithium-ion battery can be determined by looking up a table according to the current power voltage signal. The discharging test may be to send a voltage collecting signal to the battery capacity collecting module through the control module 101 according to a preset collecting time interval, control the second switch to be closed, conduct the second interface end and the first output end, then obtain a power voltage signal of the lithium sub-battery, obtain a discharging graph with the battery capacity as an abscissa and the power voltage as an ordinate through multiple discharging tests, and thus obtain battery capacities corresponding to different power voltage signals. It should be noted that, in the constant current charging and discharging process, the voltage is continuously changed along with the change of the charging and discharging depth (residual capacity), so the battery capacity can be measured by collecting the power supply voltage signal. Thus, the battery capacity of the lithium-ion battery can be measured by the battery capacity measuring module 106, so that the battery state of the lithium-ion battery can be obtained, and the practicability of the intelligent water meter measuring circuit 10 is improved.

Fig. 19 is a schematic diagram of a structure of an intelligent water meter 20 according to an embodiment of the present application, and as shown in fig. 19, the intelligent water meter 20 includes an intelligent water meter measuring circuit 10 as described in the foregoing implementation.

Through the intelligent water meter measuring circuit 10 provided by the embodiment of the application, a user can develop the intelligent water meter by only selecting the lithium battery and the ultrasonic transducer, so that the cost of the intelligent water meter can be reduced, and the production period can be shortened.

The above description of the intelligent water meter measuring circuit 10, the flow measuring method and the intelligent water meter provided by the application applies specific examples to illustrate the principle and the implementation of the application, and the above examples are only used to help understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims

1. An intelligent water meter measuring circuit, comprising:

a control module;

the battery activation module is used for removing the passivation film of the lithium-ion battery under the control of the activation signal sent by the control module;

2. The intelligent water meter measurement circuit of claim 1, wherein,

the control module specifically comprises: an activation signal output;

the battery activation module specifically includes: the first input end is used for receiving the activation signal, the first interface end is used for connecting the lithium-ion battery, and the first discharging unit;

the first discharging unit is also electrically connected with the first interface end and is used for discharging and outputting the lithium-ion battery through the first interface end under the control of the activating signal.

3. The intelligent water meter measurement circuit of claim 2, wherein the first discharge unit specifically comprises: the first switch assembly, the grounding end and the first resistor;

The first resistor is electrically connected between the first switch assembly and the grounding end and is used for discharging and outputting the lithium-ion battery.

4. The intelligent water meter measurement circuit of claim 3, wherein the first switch component is a first transistor;

the control electrode is electrically connected with the first input end and is used for conducting connection of the first electrode and the second electrode when the activation signal is the preset level signal, and controlling the first interface end to be conducted with the first resistor.

5. The intelligent water meter measurement circuit of claim 1, wherein the transducer interface module specifically comprises:

the ultrasonic transducer comprises a filtering unit, an impedance matching unit and an interface unit for connecting the ultrasonic transducer;

the filtering unit is electrically connected with the control module and the interface unit respectively and is used for filtering the echo signals sent by the ultrasonic transducer and received by the interface unit and sending the filtered echo signals to the control module;

The impedance matching unit is electrically connected with the control module and the interface unit respectively and is used for carrying out impedance matching on the intelligent water meter measuring circuit and the ultrasonic transducer.

6. The intelligent water meter measurement circuit of claim 1, wherein the intelligent water meter measurement circuit further comprises: a battery voltage stabilizing module;

the battery voltage stabilizing module specifically comprises: the voltage stabilizing unit and the testing unit;

the control module specifically further comprises: a power signal input terminal;

the voltage stabilizing unit is arranged between the lithium-ion battery and the control module and is used for stabilizing the power supply voltage signal output by the lithium-ion battery and sending the stabilized power supply voltage signal to the power supply signal input end;

7. The intelligent water meter measurement circuit of claim 6, wherein the intelligent water meter measurement circuit further comprises: and the battery interface module is used for protecting the intelligent water meter measuring circuit and is respectively and electrically connected with the lithium-ion battery, the battery activating module and the battery voltage stabilizing module.

8. The intelligent water meter measurement circuit of claim 1, wherein the intelligent water meter measurement circuit further comprises: a battery capacity measurement module;

the battery capacity measurement module specifically includes: the second input end is used for receiving a voltage acquisition signal sent by the control module, the second interface end is used for connecting the lithium-ion battery, the second switch unit and the first output end is used for sending a power supply voltage signal output by the lithium-ion battery to the control module;

the second input end is electrically connected with the control module and the second switch unit respectively;

the control module is also used for determining the battery capacity of the lithium-ion battery according to the power supply voltage signal.

9. The intelligent water meter measurement circuit of claim 1, wherein the intelligent water meter measurement circuit further comprises: a storage module;

the storage module specifically comprises: a third switching unit and a storage unit;

The third switch unit is electrically connected with the control module and the storage unit respectively and is used for receiving a storage control signal sent by the control module, and when the storage control signal is a preset level signal, the connection between the storage unit and the lithium ion battery is conducted to enable the storage module to be started.

10. A flow measurement method, characterized in that it is applied to an intelligent water meter measurement circuit according to any one of claims 1 to 9, said intelligent water meter measurement circuit comprising: the device comprises a control module, a battery activation module and a transducer interface module; the method comprises the following steps:

responding to the activation signal through the battery activation module, and removing the passivation film of the lithium-ion battery;

transmitting the measurement signal to an ultrasonic transducer through the transducer interface module, receiving an echo signal transmitted by the ultrasonic transducer, and transmitting the echo signal to the control module; the measuring signal is used for controlling the ultrasonic transducer to measure flow and acquire the echo signal;

11. The method according to claim 10, wherein the control module specifically comprises: an activation signal output; the battery activation module specifically includes: the first input end, the first interface end, the grounding end and the first discharge unit; the removing, by the battery activation module, the passivation film of the lithium-ion battery in response to the activation signal, includes:

receiving the activation signal sent by the activation signal output end through the first input end, and sending the activation signal to the first discharge unit;

12. The method of claim 11, wherein the first discharge unit comprises: a first switch assembly and a first resistor; the discharging output of the lithium-ion battery through the first interface terminal is performed by the first discharging unit in response to the activation signal, and the discharging output comprises the following steps:

And the first resistor is electrically connected with the grounding end to discharge and output the lithium-ion battery.

13. The method of claim 12, wherein the first switching component is a first transistor, the first transistor comprising: a control electrode, a first electrode, and a second electrode; the controlling, by the first switch component, the first interface terminal to be turned on with the first resistor when the activation signal is a preset level signal includes:

and when the control electrode of the first transistor is used for conducting the connection between the first electrode and the second electrode when the activation signal is the preset level signal, controlling the first interface end to be conducted with the first resistor.

14. The method of claim 10, wherein the intelligent water meter measurement circuit further comprises: a battery voltage stabilizing module; the battery voltage stabilizing module specifically comprises: the voltage stabilizing unit and the testing unit; the control module specifically further comprises: a power signal input terminal; the method further comprises the steps of:

and the voltage stabilizing unit is used for receiving the power supply voltage signal output by the lithium-ion battery, stabilizing the voltage of the power supply voltage signal and sending the stabilized power supply voltage signal to the power supply signal input end.

15. An intelligent water meter, characterized in that it comprises an intelligent water meter measuring circuit according to any one of claims 1-9.