CN114690044A - Power supply circuit with current self-checking capability - Google Patents

Power supply circuit with current self-checking capability Download PDF

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Publication number
CN114690044A
CN114690044A CN202210339157.1A CN202210339157A CN114690044A CN 114690044 A CN114690044 A CN 114690044A CN 202210339157 A CN202210339157 A CN 202210339157A CN 114690044 A CN114690044 A CN 114690044A
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current
voltage
module
data
self
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金颖锋
于鲲
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Shanghai Yunheng Technology Co ltd
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Shanghai Yunheng Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits

Abstract

The invention discloses a power supply circuit with current self-checking capability, which comprises a power supply circuit system with current self-checking capability integrally adopted by the method, wherein the power supply circuit system with current self-checking capability comprises a circuit electronic element terminal, a current self-checking module and a data analysis early warning module, the circuit electronic element terminal is used for acquiring voltage and current data and enabling terminal data of a water meter panel in a working state, the current self-checking module is used for calculating voltage and current values of the system in different power enabling states, the data analysis early warning module is used for carrying out comparison analysis and early warning according to the calculated current data and the acquired and recorded voltage data, the circuit electronic element terminal is electrically connected with the current self-checking module, the current self-checking module is electrically connected with the data analysis early warning module, the working current is regularly self-checked and compared with a factory reference value, the invention has the characteristics of on-line monitoring of current consumption and cost saving.

Description

Power supply circuit with current self-checking capability
Technical Field
The invention relates to the technical field of self-checking of power supply circuits, in particular to a power supply circuit with current self-checking capability.
Background
The current NB intelligent water meter and gas meter power supply scheme usually uses a battery as a main power supply, no matter a dry battery or a disposable battery is used, the battery has strict requirements on working current, the working current of a product subjected to factory inspection meets the design requirements, but due to the severe working environment, particularly the water meter is often in a humid and water-immersed environment, the protection measures are slightly improper, a circuit part of the water meter is easily corroded by water gas, and finally the circuit fails, and the initial performance of the failure is that the current consumption of the circuit is increased due to the existence of the water gas.
The current water meter is usually checked and replaced after the voltage of a battery is obviously reduced or the current water meter is completely failed, the circuit part of the replaced water meter can not be reused due to serious corrosion, and if protective measures in the production process have process problems, massive failures can be generated in a period of time after the water meter is installed, huge losses are caused, if the working current can be self-checked at regular time after the water meter is installed and compared with a factory reference value, warning information can be sent out in a targeted manner, for a product with communication capacity, the working current information is submitted when the product is communicated with a service platform, the service platform can obtain the service condition of the installed product, the product which has failure condition but can normally work is early warned in advance, replacement operation can be carried out at proper time, and the product can be prevented from generating batch failures, and the possibility of recycling the replaced product can be ensured to the maximum extent after operations such as cleaning, drying, verification and maintenance are carried out on the replaced product in the early warning stage. Therefore, it is necessary to design a power circuit with current self-test capability for on-line current consumption monitoring and cost-saving.
Disclosure of Invention
The present invention is directed to a power circuit with current self-checking capability, so as to solve the problems mentioned in the background art.
In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a power supply circuit with electric current self-checking ability, includes the power supply circuit system with electric current self-checking ability that this method wholly adopted, power supply circuit system with electric current self-checking ability includes circuit electronic component terminal, electric current self-checking module and data analysis early warning module, circuit electronic component terminal is used for acquireing under the water gauge plate operating condition voltage electric current data and enable end data, electric current self-checking module is used for the different power of computational system and enables the magnitude of current under the state, data analysis early warning module is used for carrying out contrastive analysis and early warning according to the electric current data of calculating and the voltage data of gathering the record, circuit electronic component terminal is connected with electric current self-checking module electricity, electric current self-checking module is connected with data analysis early warning module electricity.
According to the technical scheme, the circuit electronic component terminal comprises a battery voltage detection unit, a power supply voltage enabling end and an analog-to-digital conversion module, the battery voltage detection unit is used for detecting the voltage of a system working battery through different on-resistances and power switches, the power supply voltage enabling end is used for detecting the enabling states of a power supply end and a voltage end in a detection circuit, the analog-to-digital conversion module is used for performing analog-to-digital conversion on apparent power connected to the micro-control unit to obtain a corresponding voltage value, the battery voltage detection unit is electrically connected with the power supply voltage enabling end, and the power supply voltage enabling end is electrically connected with the analog-to-digital conversion module.
According to the technical scheme, the current self-checking module comprises an enabling control module, a large-current operating module, a voltage value conversion obtaining module and a self-checking current calculating module, wherein the enabling control module is used for controlling enabling states of a power supply and a voltage end, the large-current operating module is used for operating large-current operation in a normal working state and an abnormal working state of a system, the voltage value conversion obtaining module is used for converting and obtaining a voltage value through an analog-to-digital converter, the self-checking current calculating module is used for calculating a current value of a detecting circuit through the obtained voltage value, the enabling control module is electrically connected with the large-current operating module, and the voltage value conversion obtaining module is electrically connected with the self-checking current calculating module;
the enabling control module comprises a power enabling control module and a voltage enabling control module, the power enabling control module is used for controlling enabling of a power enabling end of the detection circuit, the voltage enabling control module is used for controlling enabling of the voltage enabling end of the detection circuit, and the power enabling control module is electrically connected with the voltage enabling control module.
According to the technical scheme, the data analysis early warning module comprises a data curve graph module, a reference value and historical data module, a comparison judgment module and an output early warning module, wherein the data curve graph module is used for visually displaying a calculated current value and a recorded voltage value through a curve graph, the reference value and historical data module is used for setting a threshold value under a normal state and an abnormal state of current and calling the existing historical data, the comparison judgment module is used for comparing and judging the calculated value with the reference value and the historical data, the output early warning module is used for outputting a judgment result and performing state early warning in a divided state mode, the data curve graph module is electrically connected with the reference value and historical data module, and the comparison judgment module is electrically connected with the output early warning module;
the data curve diagram module comprises a current data submodule and a battery voltage data submodule, the current data submodule is used for carrying out curve diagram display on a current value calculated by periodic detection, the battery voltage data submodule is used for carrying out curve diagram display on an obtained and recorded voltage value, and the current data submodule is electrically connected with the battery voltage data submodule.
According to the technical scheme, the current self-checking method mainly comprises the following steps:
step S1: a detection circuit for automatically detecting voltage and current at a battery end of the water-gas meter is arranged in the system, the system is powered on, and the state of an enabling end periodically controls the operation;
step S2: the double-voltage detection circuit and the power switch are used for carrying out large-current operation on the circuit detection system in normal working and abnormal working states;
step S3: controlling the enabling state of the power supply voltage, and performing analog-to-digital conversion on the power value connected to the micro control unit to obtain a corresponding voltage value;
step S4: calculating the voltage of a battery flowing under the working state of the system and the current value when the micro-control unit system is supplied with power, integrating and calculating current data and recording voltage data, and forming a periodic current self-checking measurement curve chart of the water meter plate;
step S5: and comparing and judging the calculated current value with a delivery current reference value and historical empirical data, outputting a judgment result, and performing current numerical stage early warning.
According to the above technical solution, in the step S2, in the automatic current detection circuit for the water meter panel, a voltage detection circuit is formed by the resistors R3, R4, R5 and the conduction triodes Q4 and Q5, and is used for detecting the battery voltage UVBAT；
Another voltage detection circuit is composed of resistors R6, R7, R8 and conducting triodes Q6 and Q7 and is used for detecting system working battery voltage UVSYSThe resistor R2 and the conducting triode Q2 and Q3 form a power switch of the detection circuit;
when the power supply is enabled to be high, the switch is conducted, the on-resistance of the triode Q2 is controlled to be in a set range, and the VSYS and VBAT voltage value U is enabled to beVBAT、UVSYSMaximum equal, switch off when power is low, battery voltage UVBATThe voltage U of the working battery of the system is supplied to the system through a triode Q1 and a resistor R1VSYSAnd (5) supplying power.
According to the above technical solution, the step S3 further includes the following steps:
step S31: under the normal working state of the system, a power switch consisting of a resistor R2 and a conducting triode Q2 and Q3 is turned on to operate a valve and a large current action required by wireless communication;
step S32: setting a period to carry out self-detection on the working current of the water meter board, closing all heavy current operations, controlling the enabling state of a power supply to be low, closing a power supply switch, and synchronously controlling the enabling state of a voltage detection end to be high;
step S33: controlling two voltage detection circuits in the current self-checking state to work synchronously, and performing analog-to-digital conversion on the apparent powers Va and Vb connected to the MCU to obtain the voltage values U of the apparent powers Va and VbVaAnd UVb；
Step S34: calculating the battery voltage U according to the obtained dataVBATAnd system operating battery voltage UVSYSVoltage of battery UVBATThe calculation formula is as follows:
Figure BDA0003578169630000041
wherein R4 and R5 are used for detecting the voltage U of the batteryVBATComponent resistance of UVaA voltage value of apparent power Va obtained by A/D conversion of an analog-to-digital converter;
system operating battery voltage UVSYSThe calculation formula is as follows:
Figure BDA0003578169630000051
wherein, R7 and R8 are the voltages U of the working batteries of the detection systemVSYSComponent resistance of UVbIs the voltage value of the apparent power Vb obtained by a/D conversion by the analog-to-digital converter.
According to the above technical solution, the step S4 further includes the following steps:
step S41: calculating the voltage of a battery flowing through the system in a working state, the voltage of a system working battery flowing through the system in the working state and the current value when power is supplied to the micro control unit MCU system;
step S42: the current flowing through the battery voltage VBAT detection circuit is calculated by the formula:
Figure BDA0003578169630000052
in the formula, R1A resistor, U, for supplying the battery voltage to the system operating battery voltage via a transistor and a resistorVBATAnd UVSYSThe battery voltage and the system operating battery voltage value calculated for step S34;
the current calculation formula of the voltage VSYS detection circuit of the system working battery is as follows:
Figure BDA0003578169630000053
wherein R6, R7 and R8 are resistors in another voltage detection circuit consisting of resistor and conducting triode, UVSYSThe system operating battery voltage value calculated for step S34;
the current value calculation formula when supplying power to the micro control unit MCU system is as follows:
I3＝I1-I2
in the formula I1And I2Calculating the current value of the voltage of the battery flowing through the system under the working state of the system and the voltage of the battery flowing through the system;
step S43: and integrating the voltage value obtained by conversion and the calculated current value data, and uploading the current data through communication to form a water meter board periodic current self-checking measurement curve graph.
According to the above technical solution, the step S43 further includes the following steps:
step S431: establishing a two-dimensional plane periodic current self-checking measurement curve graph with time as a horizontal axis and a current value as a vertical axis, and synchronously acquiring and inputting stored historical data;
step S432: and obtaining a calculated self-test current curve and a historical data curve.
According to the above technical solution, the step S5 further includes the following steps:
step S51: setting a failure reminding range of the water-gas meter battery according to historical data, and calling a factory reference value of the water-gas meter;
step S52: comparing and judging the calculated current value with a factory reference value for the first time, and comparing and judging the current value for the second time by using a self-checking current curve and a historical data curve;
step S53: and judging whether the current value exceeds a reference value or not by the first comparison, judging whether the water-gas meter battery enters a failure reminding range or not by the second comparison, and performing real-time early warning according to a judgment result.
Compared with the prior art, the invention has the following beneficial effects: the invention uses a double-voltage detection circuit and a power switch to jointly carry out heavy current operation of normal work and abnormal work of a circuit detection system and control the enabling state of power supply voltage by arranging a circuit electronic element terminal, a current self-checking module and a data analysis early warning module, carries out analog-to-digital conversion on a power value connected to a micro control unit to obtain a corresponding voltage value, calculates the voltage of a battery in the work state of the system and the current value when the power is supplied to the micro control unit system, integrates and calculates current data and records voltage data to form a water meter board periodic current self-checking measurement curve chart, synchronously compares and judges the calculated current value with a factory current reference value and historical experience data, outputs a judgment result and carries out current value stage early warning.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic block diagram of the system of the present invention;
fig. 2 is a schematic block diagram of the current self-test system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides the following technical solutions: a power circuit with current self-checking capability comprises a power circuit system with current self-checking capability integrally adopted by the method, wherein the power circuit system with current self-checking capability comprises a circuit electronic element terminal, a current self-checking module and a data analysis early warning module, the circuit electronic element terminal is used for acquiring voltage and current data and enabling end data of a water meter panel in a working state, the current self-checking module is used for calculating voltage and current values of the system in different power enabling states, the data analysis early warning module is used for carrying out comparison analysis and early warning according to the calculated current data and the acquired and recorded voltage data, the circuit electronic element terminal is electrically connected with the current self-checking module, the current self-checking module is electrically connected with the data analysis early warning module, the device and the PCB are damaged because leakage current is increased after the current is increased gradually from water to water bubbles on the circuit board, the current data change trend is obvious, for the NB water meter, the current trend is certain, the calculated current data and the recorded voltage data are compared with the existing empirical data for reference, namely when the current of the NB water meter is changed from 1mA to 1.5mA, namely the current value is increased by 50 percent, even increased by 100 percent, the problem occurs, and real-time early warning is carried out according to the trend change of the current data.
The circuit electronic component terminal comprises a battery voltage detection unit, a power supply voltage enabling end and an analog-to-digital conversion module, wherein the battery voltage detection unit is used for detecting the voltage of a system working battery through different on-resistances and power switches, the power supply voltage enabling end is used for detecting the enabling state of a power supply end and a voltage end arranged in the circuit, the analog-to-digital conversion module is used for performing analog-to-digital conversion on apparent power connected to the micro-control unit to obtain a corresponding voltage value, the battery voltage detection unit is electrically connected with the power supply voltage enabling end, and the power supply voltage enabling end is electrically connected with the analog-to-digital conversion module.
The current self-checking module comprises an enabling control module, a large current operation module, a voltage value conversion acquisition module and a self-checking current calculation module, wherein the enabling control module is used for controlling the enabling high and low states of a power supply and a voltage end, the large current operation module is used for operating large current operation in a normal working state and an abnormal working state of a system, the voltage value conversion acquisition module is used for converting and acquiring a voltage value through an analog-to-digital converter, the self-checking current calculation module is used for calculating the current value of the detection circuit through the acquired voltage value, the enabling control module is electrically connected with the large current operation module, and the voltage value conversion acquisition module is electrically connected with the self-checking current calculation module;
the enabling control module comprises a power enabling control module and a voltage enabling control module, the power enabling control module is used for controlling enabling of a power enabling end of the detection circuit, the voltage enabling control module is used for controlling enabling of a voltage enabling end of the detection circuit, and the power enabling control module is electrically connected with the voltage enabling control module.
The data analysis early warning module comprises a data curve graph module, a reference value and historical data module, a comparison judgment module and an output early warning module, wherein the data curve graph module is used for visually displaying a calculated current value and a recorded voltage value through a curve graph, the reference value and historical data module is used for setting a threshold value in a normal current state and an abnormal current state and calling the existing historical data, the comparison judgment module is used for comparing and judging the calculated value with the reference value and the historical data, the output early warning module is used for outputting a judgment result and performing state early warning in different states, the data curve graph module is electrically connected with the reference value and historical data module, and the comparison judgment module is electrically connected with the output early warning module;
the data curve diagram module comprises a current data submodule and a battery voltage data submodule, the current data submodule is used for carrying out curve diagram display on a current value calculated by periodic detection, the battery voltage data submodule is used for carrying out curve diagram display on an obtained and recorded voltage value, and the current data submodule is electrically connected with the battery voltage data submodule.
The current self-checking method mainly comprises the following steps:
step S1: a detection circuit for automatically detecting voltage and current at a battery end of the water-gas meter is arranged in the system, the system is powered on, and the state of an enabling end periodically controls the operation;
step S2: the double-voltage detection circuit and the power switch are used for carrying out high-current operation of the circuit detection system in normal working and abnormal working states;
step S3: controlling the enabling state of the power supply voltage, and performing analog-to-digital conversion on the power value connected to the micro control unit to obtain a corresponding voltage value;
step S4: calculating the voltage of a battery flowing under the working state of the system and the current value when the micro-control unit system is supplied with power, integrating and calculating current data and recording voltage data, and forming a periodic current self-checking measurement curve chart of the water meter plate;
step S5: and comparing and judging the calculated current value with a factory current reference value and historical experience data, outputting a judgment result, performing current value stage early warning, performing self-checking on the working current at regular time after the water-gas meter is installed, comparing the working current with the factory reference value, and sending warning information in a targeted manner.
In step S2, in the automatic current detection circuit of the water meter panel, a voltage detection circuit is formed by the resistors R3, R4, R5 and the conductive triodes Q4 and Q5, and is used for detecting the battery voltage UVBAT；
Another voltage detection circuit is composed of resistors R6, R7, R8 and conducting triodes Q6 and Q7 and is used for detecting system working battery voltage UVSYSThe resistor R2 and the conducting triode Q2 and Q3 form a power switch of the detection circuit;
when the power supply is enabled to be high, the switch is conducted, the on-resistance of the triode Q2 is controlled to be conducted within a set range, and the VSYS and VBAT voltage values U are enabledVBAT、UVSYSMaximum equal, switch off when power is low, battery voltage UVBATThe voltage U of the working battery of the system is supplied to the system through a triode Q1 and a resistor R1VSYSPower supply, differential pressure U1＝I1*R1And U is made of1<UQ1，UQ1The voltage of the PN junction of the triode Q1 is about 0.5V-0.7V, wherein the triode Q1 ensures that the system working battery voltage VSYS is only 0.7V at most less than the battery voltage VBAT under the condition that the system generates large current, and the micro control unit MCU can be ensured to work normally.
Step S3 further includes the steps of:
step S31: under the normal working state of the system, a power switch consisting of a resistor R2 and a conducting triode Q2 and Q3 is turned on to operate a valve and a large current action required by wireless communication;
step S32: setting a period to carry out self-detection on the working current of the water meter board, closing all heavy current operations, controlling the enabling state of a power supply to be low, closing a power supply switch, and synchronously controlling the enabling state of a voltage detection end to be high;
step S33: two voltage detection circuits in the control current self-checking state work synchronously and are connected to the MCUPerforming analog-to-digital conversion on the apparent powers Va and Vb to obtain voltage values U of the apparent powers Va and VbVaAnd UVbApparent power is used to indicate the capacity of the transformer, and electrical equipment usually consumes reactive power in addition to active power consumption, where reactive power is not available, but it should also be provided by the grid, the sum of which is called apparent power;
step S34: calculating the battery voltage U according to the obtained dataVBATAnd system operating battery voltage UVSYSBattery voltage UVBATThe calculation formula is as follows:
Figure BDA0003578169630000101
wherein R4 and R5 are detected battery voltage UVBATComponent resistance of UVaTwo voltage detection circuits are operated together for the voltage value of the apparent power Va obtained by A/D conversion of an analog-to-digital converter, and the battery voltage U is detected as the voltage value of the apparent power Va connected to the micro control unit MCU is larger when the resistance value is constantVBATThe larger the size;
system operating battery voltage UVSYSThe calculation formula is as follows:
Figure BDA0003578169630000102
wherein, R7 and R8 are the voltages U of the working batteries of the detection systemVSYSComponent resistance of UVbTwo voltage detection circuits are operated together for the voltage value of the apparent power Vb obtained by A/D conversion by the analog-to-digital converter, and the battery voltage U is detected when the resistance value is fixed, the larger the voltage value of the apparent power Vb connected to the micro control unit MCU isVSYSThe larger.
Step S4 further includes the steps of:
step S41: calculating the voltage of a battery flowing through the system in a working state, the voltage of a system working battery flowing through the system in the working state and the current value when the micro control unit MCU system is supplied with power;
step S42: the current flowing through the battery voltage VBAT detection circuit is calculated by the formula:
Figure BDA0003578169630000111
in the formula, R1Resistors, U, for supplying the battery voltage to the system operating battery voltage via the transistor and the resistorVBATAnd UVSYSA resistance value R for the battery voltage calculated in step S34 and the system operating battery voltage value, the battery voltage supplying power to the system operating battery voltage through the triode and the resistor1At a certain time, the calculated battery voltage UVBATAnd system operating battery voltage UVSYSThe larger the voltage difference between them, the current I flowing through the battery voltage1The larger the size;
the current calculation formula flowing through the system working battery voltage VSYS detection circuit is as follows:
Figure BDA0003578169630000112
wherein R6, R7 and R8 are resistors in another voltage detection circuit consisting of resistor and conducting triode, UVSYSThe system operating battery voltage U calculated in step S34 is calculated at a timing of R6, R7 and R8 in another voltage detection circuit composed of a resistor and a conducting transistorVSYSThe larger the current I flowing through the system operating battery voltage2The larger the size;
the current value calculation formula when supplying power to the micro control unit MCU system is as follows:
I3＝I1-I2
in the formula I1And I2Calculating the current value I of the voltage of the battery and the voltage of the system working battery under the system working state, wherein the larger the current difference between the voltage of the battery and the voltage of the system working battery is, the current value I when the micro control unit MCU system is supplied with power3The larger the difference, the more negative the difference, the smaller the difference;
step S43: and integrating the voltage value obtained by conversion and the calculated current value data, and uploading the current data through communication to form a water meter board periodic current self-checking measurement curve graph.
Step S43 further includes the steps of:
step S431: establishing a two-dimensional plane periodic current self-checking measurement curve graph with time as a horizontal axis and a current value as a vertical axis, and synchronously acquiring and inputting stored historical data;
step S432: the calculated self-checking current curve and the historical data curve are obtained, the current trend of the NB water meter is certain, by referring to some empirical data, when the current is increased by 50 percent, namely the current is changed from 1mA to 1.5mA, the battery begins to fail, when the current is increased by 100 percent, the battery completely fails, and the current data is uploaded to a data processing platform for judgment according to the current data calculated in real time when the system works;
step S433: and (4) performing auxiliary detection on the battery condition by recording the battery voltage data measured each time.
Step S5 further includes the steps of:
step S51: setting a failure reminding range of a battery of the water-gas meter according to historical data, calling a factory reference value of the water-gas meter, wherein leakage current is increased from the time when water exists on a circuit board on the water-gas meter to the time when water is soaked, and then current is rapidly increased (avalanche) to cause damage to electronic components and a PCB (printed circuit board), the change trend of the current in the process is obvious, but a critical point is difficult to find, so that the failure reminding range of the battery is set;
step S52: comparing and judging the calculated current value with a factory reference value for the first time, and comparing and judging the current value for the second time by using a self-checking current curve and a historical data curve;
step S53: whether the current value exceeds a reference value is judged through first comparison, whether the water-gas meter battery enters a failure reminding range is judged through second comparison, real-time early warning is carried out according to a judgment result, if the working current can be subjected to self-checking regularly after the water meter is installed, the working current is compared with a factory reference value, warning information can be sent out in a targeted mode, early warning can be carried out on products which start to have failure conditions and can work normally, replacement operation can be carried out when appropriate, mass failures of the products can be prevented, the products can be replaced in an early warning stage, and after the operations such as cleaning, drying, verification and maintenance are carried out, the possibility of recycling can be guaranteed to the maximum extent.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A power circuit with current self-checking capability, characterized in that: the method integrally adopts a power circuit system with current self-checking capability, the power circuit system with current self-checking capability comprises a circuit electronic element terminal, a current self-checking module and a data analysis early warning module, the circuit electronic element terminal is used for acquiring voltage and current data and enabling end data of a water meter panel in a working state, the current self-checking module is used for calculating voltage and current values of the system in different power enabling states, the data analysis early warning module is used for carrying out comparison analysis and early warning according to the calculated current data and the acquired and recorded voltage data, the circuit electronic element terminal is electrically connected with the current self-checking module, the current self-checking module is electrically connected with the data analysis early warning module, water on the circuit board gradually bubbles, firstly, leakage current is increased and then the current is rapidly increased, so that devices and PCBs are damaged, the current data change trend is obvious, for the NB water meter, the current trend is certain, the calculated current data and the recorded voltage data are compared with the existing empirical data for reference, namely when the current of the NB water meter is changed from 1mA to 1.5mA, namely the current value is increased by 50 percent, even increased by 100 percent, the problem occurs, and real-time early warning is carried out according to the trend change of the current data.
2. A power supply circuit having current self-test capability as claimed in claim 1, wherein: the circuit electronic component terminal comprises a battery voltage detection unit, a power supply voltage enabling end and an analog-to-digital conversion module, wherein the battery voltage detection unit is used for detecting the voltage of a system working battery through different on-resistances and power switches, the power supply voltage enabling end is used for detecting the enabling state of a power supply end and a voltage end arranged in a detection circuit, the analog-to-digital conversion module is used for performing analog-to-digital conversion on apparent power connected to the micro-control unit to obtain a corresponding voltage value, the battery voltage detection unit is electrically connected with the power supply voltage enabling end, and the power supply voltage enabling end is electrically connected with the analog-to-digital conversion module.
3. A power supply circuit having current self-test capability as claimed in claim 2, wherein: the current self-checking module comprises an enabling control module, a large current operating module, a voltage value conversion acquisition module and a self-checking current calculation module, wherein the enabling control module is used for controlling the enabling high and low states of a power supply and a voltage end, the large current operating module is used for operating large current operation in a normal working state and an abnormal working state of a system, the voltage value conversion acquisition module is used for converting and acquiring a voltage value through an analog-to-digital converter, the self-checking current calculation module is used for calculating the current value of a detection circuit through the acquired voltage value, the enabling control module is electrically connected with the large current operating module, and the voltage value conversion acquisition module is electrically connected with the self-checking current calculation module;
the enabling control module comprises a power enabling control module and a voltage enabling control module, the power enabling control module is used for controlling enabling of a power enabling end of the detection circuit, the voltage enabling control module is used for controlling enabling of the voltage enabling end of the detection circuit, and the power enabling control module is electrically connected with the voltage enabling control module.
4. A power supply circuit having current self-test capability as claimed in claim 3, wherein: the data analysis early warning module comprises a data curve graph module, a reference value and historical data module, a comparison judgment module and an output early warning module, wherein the data curve graph module is used for visually displaying a calculated current value and a recorded voltage value through a curve graph, the reference value and historical data module is used for setting a threshold value in a normal current state and an abnormal current state and calling the existing historical data, the comparison judgment module is used for comparing and judging the calculated value with the reference value and the historical data, the output early warning module is used for outputting a judgment result and performing state early warning in a branching mode, the data curve graph module is electrically connected with the reference value and historical data module, and the comparison judgment module is electrically connected with the output early warning module;
the data curve diagram module comprises a current data submodule and a battery voltage data submodule, the current data submodule is used for carrying out curve diagram display on a current value calculated by periodic detection, the battery voltage data submodule is used for carrying out curve diagram display on an obtained and recorded voltage value, and the current data submodule is electrically connected with the battery voltage data submodule.
5. The current self-test method for the power circuit with the current self-test capability according to any one of claims 1 to 4 is characterized in that: the current self-checking method mainly comprises the following steps:
step S1: a detection circuit for automatically detecting voltage and current at a battery end of the water-gas meter is arranged in the system, the system is powered on, and the state of an enabling end periodically controls the operation;
step S2: the double-voltage detection circuit and the power switch are used for carrying out high-current operation of the circuit detection system in normal working and abnormal working states;
step S3: controlling the enabling state of the power supply voltage, and performing analog-to-digital conversion on the power value connected to the micro control unit to obtain a corresponding voltage value;
step S4: calculating the voltage of a battery flowing under the working state of the system and the current value when the micro-control unit system is supplied with power, integrating and calculating current data and recording voltage data, and forming a periodic current self-checking measurement curve chart of the water meter plate;
step S5: and comparing and judging the calculated current value with a factory current reference value and historical experience data, outputting a judgment result, and performing current value stage early warning.
6. A power supply circuit with current self-checking capability as claimed in claim 5 wherein: in step S2, in the automatic current detection circuit of the water meter panel, a voltage detection circuit is formed by the resistors R3, R4, R5 and the conduction triodes Q4 and Q5, and is used for detecting the battery voltage UVBAT；
Another voltage detection circuit is composed of resistors R6, R7, R8 and conducting triodes Q6 and Q7 and is used for detecting system working battery voltage UVSYSThe resistor R2 and the conducting triode Q2 and Q3 form a power switch of the detection circuit;
when the power supply is enabled to be high, the switch is conducted, the on-resistance of the triode Q2 is controlled to be conducted within a set range, and the VSYS and VBAT voltage values U are enabledVBAT、UVSYSMaximum equal, switch off when power is low, battery voltage UVBATThe voltage U of the working battery of the system is supplied to the system through a triode Q1 and a resistor R1VSYSAnd (5) supplying power.
7. A power supply circuit having current self-test capability as claimed in claim 6, wherein: the step S3 further includes the steps of:
step S31: under the normal working state of the system, a power switch consisting of a resistor R2 and a conducting triode Q2 and Q3 is turned on to operate a valve and a large current action required by wireless communication;
step S32: setting a period to carry out self-detection on the working current of the water meter board, closing all heavy current operations, controlling the enabling state of a power supply to be low, closing a power supply switch, and synchronously controlling the enabling state of a voltage detection end to be high;
step S33: controlling two voltage detection circuits in the current self-checking state to work synchronously, and performing analog-to-digital conversion on the apparent powers Va and Vb connected to the MCU to obtain the voltage values U of the apparent powers Va and VbVaAnd UVb；
Step S34: calculating the battery voltage U according to the obtained dataVBATAnd system operating battery voltage UVSYSVoltage of battery UVBATThe calculation formula is as follows:
Figure FDA0003578169620000041
wherein R4 and R5 are detected battery voltage UVBATComponent resistance of UVaA voltage value of apparent power Va obtained by A/D conversion of an analog-to-digital converter;
system operating battery voltage UVSYSThe calculation formula is as follows:
Figure FDA0003578169620000042
wherein, R7 and R8 are the voltages U of the working batteries of the detection systemVSYSComponent resistance of UVbIs the voltage value of the apparent power Vb obtained by a/D conversion by the analog-to-digital converter.
8. A power supply circuit having current self-test capability as claimed in claim 7, wherein: the step S4 further includes the steps of:
step S41: calculating the voltage of a battery flowing through the system in a working state, the voltage of a system working battery flowing through the system in the working state and the current value when the micro control unit MCU system is supplied with power;
step S42: the current flowing through the battery voltage VBAT detection circuit is calculated by the formula:
Figure FDA0003578169620000043
in the formula, R1Resistors, U, for supplying the battery voltage to the system operating battery voltage via the transistor and the resistorVBATAnd UVSYSThe battery voltage and the system operating battery voltage value calculated for step S34;
the current calculation formula flowing through the system working battery voltage VSYS detection circuit is as follows:
Figure FDA0003578169620000051
wherein R6, R7 and R8 are resistors in another voltage detection circuit consisting of resistor and conducting triode, UVSYSThe system operating battery voltage value calculated for step S34;
the current value calculation formula when supplying power to the micro control unit MCU system is as follows:
I3＝I1-I2
in the formula I1And I2The calculated current value of the voltage of the battery flowing through the system under the system working state and the voltage of the battery flowing through the system under the system working state.
Step S43: and integrating the voltage value obtained by conversion and the calculated current value data, and uploading the current data through communication to form a periodic current self-checking measurement curve chart of the water meter plate.
9. A power supply circuit having current self-test capability as claimed in claim 8, wherein: the step S43 further includes the steps of:
step S431: establishing a two-dimensional plane periodic current self-checking measurement curve graph with time as a horizontal axis and a current value as a vertical axis, and synchronously acquiring and inputting stored historical data;
step S432: obtaining a calculated self-checking current curve and a historical data curve;
step S433: and (4) performing auxiliary detection on the battery condition by using the battery voltage data measured each time.
10. A power supply circuit having current self-test capability as claimed in claim 9, wherein: the step S5 further includes the steps of:
step S51: setting a failure reminding range of the water-gas meter battery according to historical data, and calling a factory reference value of the water-gas meter;
step S52: comparing and judging the calculated current value with a factory reference value for the first time, and comparing and judging the current value for the second time by using a self-checking current curve and a historical data curve;
step S53: and judging whether the current value exceeds a reference value or not by the first comparison, judging whether the water-gas meter battery enters a failure reminding range or not by the second comparison, and performing real-time early warning according to a judgment result.
CN202210339157.1A 2022-04-01 2022-04-01 Power supply circuit with current self-checking capability Pending CN114690044A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117706261A (en) * 2024-02-06 2024-03-15 深圳市积加创新技术有限公司 Monitoring method for health state of constant electric product based on electricity meter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117706261A (en) * 2024-02-06 2024-03-15 深圳市积加创新技术有限公司 Monitoring method for health state of constant electric product based on electricity meter

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