CN116707121B - Electric energy meter clock nursing method, device and medium - Google Patents
Electric energy meter clock nursing method, device and medium Download PDFInfo
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- CN116707121B CN116707121B CN202310999979.7A CN202310999979A CN116707121B CN 116707121 B CN116707121 B CN 116707121B CN 202310999979 A CN202310999979 A CN 202310999979A CN 116707121 B CN116707121 B CN 116707121B
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- 238000000034 method Methods 0.000 title claims abstract description 86
- 230000000474 nursing effect Effects 0.000 title claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 44
- 238000004146 energy storage Methods 0.000 claims description 33
- 238000012544 monitoring process Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 23
- 230000015654 memory Effects 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 13
- 230000007958 sleep Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 8
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- 230000000087 stabilizing effect Effects 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a method, a device and a medium for nursing a clock of an electric energy meter, relates to the field of electric energy meters, and solves the problem of clock loss caused by frequent access to a low-power consumption mode. Firstly, the application enters the mains supply mode under the condition that the mains supply voltage exceeds the preset stable voltage and the preset stable time is kept, so that the mains supply can be stably electrified, in addition, in the mains supply initialization stage, whether the power is lost is monitored, if the power is lost, the mains supply is directly exited, and in the mains supply initialization stage, each module does not enter the working state, the quick reset can be realized, and the problems that the mains supply is exited due to overlarge load after the mains supply enters the working state, the battery is started, the battery is frequently started to consume the battery to trigger the low voltage detection reset, and the internal clock is lost are avoided.
Description
Technical Field
The application relates to the field of electric energy meters, in particular to a method, a device and a medium for nursing a clock of an electric energy meter.
Background
The electric energy meter is used as an electric energy metering instrument, and the accuracy of a clock is important for accurate metering of electric quantity. The clock which works normally can provide important reference basis for timing and charging. If the clock module fails, the clock stops working, so that the difference value between the internal clock and the standard time of the electric energy meter is larger and larger, the accuracy and fairness of the metering data in the electric energy meter can be directly affected, and the metering of the electric energy meter is meaningless.
The electric energy meter supplies power by using mains supply, when the mains supply is connected, each module starts to initialize and then starts to work, the output voltage is reduced due to the fact that the load is increased successively, when the output voltage is lower than a low power consumption threshold value, the mains supply is exited, low power consumption initialization is performed, the battery supplies power, after the loads are powered down, the output voltage is increased, the mains supply initialization is restarted, therefore, frequent in-out low power consumption modes can be caused, the battery power is consumed, and when the battery voltage is pulled to be lower than 2.1V, low voltage reset is triggered, and clock loss is caused.
Therefore, how to solve the problem of clock loss caused by frequently entering and exiting the low power consumption mode is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The application aims to provide a method, a device and a medium for nursing a clock of an electric energy meter, which solve the problem of clock loss caused by frequent in-out and low-power consumption modes.
In order to solve the technical problems, the application provides a clock nursing method for an electric energy meter, which is applied to the electric energy meter and comprises the following steps: the device comprises a micro control unit, a battery power supply circuit and a mains supply circuit; the micro control unit is connected with the battery power supply circuit and the mains supply circuit;
Characterized in that the method comprises:
judging whether to access the commercial power;
if yes, entering a mains supply mode, and initializing mains supply;
in the mains supply initialization process, monitoring whether power failure occurs in real time;
if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module;
the utility power supply mode is to supply power to the micro control unit through the utility power supply circuit, and the battery power supply mode is to supply power to the micro control unit through the battery power supply circuit.
In another aspect, in the method for clock care of an electric energy meter, the entering the battery power supply mode further includes:
judging whether the commercial power is accessed;
if the mains supply is connected, judging whether the mains supply voltage exceeds a preset stable voltage and keeping the preset stable time;
if yes, entering the mains supply mode.
In another aspect, in the above method for clock care of an electric energy meter, the real-time monitoring whether power failure occurs includes:
monitoring whether the output voltage of the mains supply circuit is lower than a preset rated voltage or not;
If yes, judging that power failure occurs;
if not, judging that the power failure does not occur.
In another aspect, in the above electric energy meter clock care method, the mains supply circuit includes: the power supply chip, the switch driving circuit, the first energy storage capacitor and the first resistor; the power chip is connected with the switch driving circuit, and the output end of the switch driving circuit is connected with the micro control unit; the power supply pin of the power supply chip is grounded through the first energy storage capacitor, and the enabling pin of the power supply chip is grounded through the first resistor;
correspondingly, the method further comprises the steps of:
judging whether the input voltage of the mains supply circuit is lower than a preset voltage threshold or whether the mains supply circuit outputs overload;
if yes, starting the power chip;
if the number of times of failure in starting the power chip exceeds a first preset number of times, controlling the power chip to enter a dormant state;
controlling a power supply pin of the power supply chip to charge and discharge until the charge and discharge times reach a second preset times;
and controlling the power chip to exit from the sleep state, and returning to the step of starting the power chip.
In another aspect, in the above method for clock care of an electric energy meter, the battery power supply circuit includes: the second energy storage capacitor, the first diode, the second diode, the third diode and the direct current battery; the battery power supply pin of the micro control unit is connected with the cathode of the first diode and the cathode of the second diode; the positive electrode of the first diode is grounded through a second energy storage capacitor, the positive electrode of the second diode is connected with the positive electrode of the direct current battery, the positive electrode of the first diode is connected with the negative electrode of the third diode, and the positive electrode of the third diode is connected with the output end of the alternating current power supply;
the exiting mains initialization includes:
and controlling each module to reset, and supplying power to the micro control unit through the direct current battery or the second energy storage capacitor.
In another aspect, in the method for nursing an electric energy meter clock, the method further includes:
and charging the second energy storage capacitor with commercial power through the alternating current power supply output end.
In another aspect, in the above method for clock care of an electric energy meter, the battery power supply circuit further includes: a second resistor; the positive electrode of the second diode is connected with the positive electrode of the direct current battery through the second resistor;
Correspondingly, the power is supplied to the micro control unit through the direct current battery or the second energy storage capacitor, and then the micro control unit further comprises:
judging whether voltage drop exists at two ends of the second resistor or not;
if yes, power is supplied to the micro control unit through the direct current battery currently;
if not, power is supplied to the micro control unit through the second energy storage capacitor currently.
In order to solve the technical problem, the application also provides an electric energy meter clock nursing device, which is applied to an electric energy meter and comprises: the device comprises a micro control unit, a battery power supply circuit and a mains supply circuit; the micro control unit is connected with the battery power supply circuit and the mains supply circuit;
characterized in that the device comprises:
the judging module is used for judging whether the commercial power is accessed; if yes, triggering a mains supply initialization module;
the mains supply initialization module is used for entering a mains supply mode to initialize the mains supply;
the monitoring module is used for monitoring whether power failure occurs in real time in the mains supply initializing process;
the battery power supply initialization module is used for exiting from the mains supply initialization if power failure occurs, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module;
The utility power supply mode is to supply power to the micro control unit through the utility power supply circuit, and the battery power supply mode is to supply power to the micro control unit through the battery power supply circuit.
In order to solve the technical problem, the application also provides an electric energy meter clock nursing device, which comprises:
a memory for storing a computer program;
and the processor is used for realizing the steps of the electric energy meter clock nursing method when executing the computer program.
In order to solve the technical problem, the application also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the steps of the clock nursing method of the electric energy meter when being executed by a processor.
According to the electric energy meter clock nursing method provided by the application, whether the mains voltage exceeds the preset stable voltage or not is judged, and the preset stable time is kept; if yes, entering a mains supply mode, and initializing mains supply; in the mains supply initialization process, monitoring whether power failure occurs in real time; if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module; the power supply mode of the commercial power is to supply power to the micro control unit through the commercial power supply circuit, and the power supply mode of the battery is to supply power to the micro control unit through the battery power supply circuit. Firstly, the application enters the mains supply mode under the condition that the mains supply voltage exceeds the preset stable voltage and the preset stable time is kept, so that the mains supply can be stably electrified, in addition, in the mains supply initialization stage, whether the power is lost is monitored, if the power is lost, the mains supply is directly exited, and in the mains supply initialization stage, each module does not enter the working state, the quick reset can be realized, and the problems that the mains supply is exited due to overlarge load after the mains supply enters the working state, the battery is started, the battery is frequently started to consume the battery to trigger the low voltage detection reset, and the internal clock is lost are avoided.
In addition, the application also provides a device and a medium, which correspond to the method and have the same effects.
Drawings
For a clearer description of embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a flowchart of a method for nursing a clock of an electric energy meter according to an embodiment of the present application;
fig. 2 is a circuit diagram of a mains supply circuit according to an embodiment of the present application;
fig. 3 is a circuit diagram of a battery power supply circuit according to an embodiment of the present application;
fig. 4 is a block diagram of a clock care device of an electric energy meter according to an embodiment of the present application;
fig. 5 is a block diagram of another clock care device for an electric energy meter according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present application.
The application provides a method, a device and a medium for nursing a clock of an electric energy meter.
In order to better understand the aspects of the present application, the present application will be described in further detail with reference to the accompanying drawings and detailed description.
In the prior electric energy meter, a clock detection circuit is only designed in the prior electric energy meter to detect a clock signal, and a first counter is utilized to count a reference clock from an initial value to obtain a first count value; counting the clock to be measured from the initial value by using a second counter to obtain a second count value; shifting the second count value to the right by a preset bit by using a shifter; the first sampling unit is used for sampling the shifted second count value output by the shifter when the first count value is an initial value to obtain a first sampling value; the second sampling unit is used for sampling the shifted second count value output by the shifter when the first count value is a set value to obtain a second sampling value; and detecting the clock to be detected according to the first sampling value and the second sampling value so as to judge whether the clock works normally or not and whether the clock frequency is accurate or not.
However, the above-described clock detection circuit detects whether the clock is operating normally, and it is not proposed how to prevent the clock from being lost.
The electric energy meter can be started when the voltage of the power supply chip is low. In the initialization process, each load is increased successively, so that 15V output voltage is pulled down to be lower than a low power consumption threshold value, then the load is withdrawn, 15V output voltage is raised to a threshold value required by withdrawal of low power consumption, initialization is carried out, and each load is connected. The process is repeated for multiple times to enter and exit the low power consumption until the battery voltage is pulled to be below 2.1V, and the low voltage reset is triggered, so that the clock is lost. Triggering a low voltage detection (Low Voltage Detection, LVD) reset is a common protection mechanism when the battery voltage is below 2.1V. LVD reset may cause circuitry to restart, which may result in a loss of state of certain devices or components, including clock settings. LVD is a circuit protection mechanism that monitors whether the voltage of a power supply is below a set threshold. When the voltage drops below a preset low voltage threshold, the LVD triggers a reset signal, causing the system to restart. In some cases, a reset operation of the LVD may result in data loss, including clock information, in some non-volatile memories. Because an LVD reset will restart the system and clear temporarily stored data, this may include registers or memory that hold system clock information.
In order to solve the above problems, an embodiment of the present application provides a method for nursing a clock of an electric energy meter, including: be applied to the electric energy meter, the electric energy meter includes: the device comprises a micro control unit, a battery power supply circuit and a mains supply circuit; the micro control unit is connected with the battery power supply circuit and the mains supply circuit;
fig. 1 is a flowchart of a method for nursing a clock of an electric energy meter according to an embodiment of the present application, as shown in fig. 1, where the method includes:
s11: judging whether the mains voltage exceeds a preset stable voltage and keeping the preset stable time;
s12: if yes, entering a mains supply mode, and initializing mains supply;
s13: in the mains supply initialization process, monitoring whether power failure occurs in real time;
s14: if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module;
the utility power supply mode is to supply power to the micro control unit through the utility power supply circuit, and the battery power supply mode is to supply power to the micro control unit through the battery power supply circuit.
In this embodiment, when the mains supply is connected, it is required to determine whether the mains voltage exceeds a preset stabilizing voltage and keeps the preset stabilizing time, the preset stabilizing voltage is a preset voltage threshold value that can enable the electric energy meter to be powered on stably, and the voltage can be kept stable for a period of time, so that the mains supply is powered on. If the mains voltage is lower than the preset stabilizing voltage or cannot be maintained for the preset stabilizing time, the battery is used for supplying power.
The utility power initialization mentioned in this embodiment refers to that each module of the electric energy meter starts to be powered on according to a preset power-on sequence, and the initialization process may involve steps of setting parameters such as date, time, electricity price, and the like, clearing metering data, and the like, and the embodiment is not limited to specific initialization contents.
In addition, in the process of initializing the commercial power in this embodiment, whether power failure occurs is monitored in real time. The power failure refers to that the output voltage of the mains supply circuit is greatly reduced or the output voltage is lower than a minimum voltage threshold value, or the mains supply voltage is lower than a preset mains supply input voltage, the electric energy meter is started under the condition of low voltage, and the condition can be that after the electric energy meter enters the electric energy meter to work after the mains supply initialization of the electric energy meter is completed, the output voltage cannot be maintained to work normally due to gradual increase of a load, so that the electric energy meter is forced to enter a low-power consumption mode, and the electric energy meter is powered by a battery. In the embodiment, the real-time monitoring is performed in the mains supply initialization process, the stable power-on of the mains supply is ensured, if the power-down condition occurs, the mains supply initialization is exited, and in the mains supply initialization stage, each module does not enter the working state, the quick reset can be realized, and the battery power supply mode is entered.
The battery power supply mode mentioned in the embodiment is to supply power to a module preset to be started in a battery function mode by a battery power supply circuit, and to initialize and start a first type module and close a second type module, wherein the first type module has a higher priority than the second type module; the priority mentioned in this embodiment refers to a power consumption priority or an importance priority, and a module with low power consumption is higher in priority than a module with high power consumption, and a module with high importance is higher in priority than a module with low importance. It is necessary to preset which modules can be started in the battery power supply mode in advance, for example, the micro control unit, the analog-to-digital converter, etc. have low power consumption and high importance, and for modules with larger power consumption, such as an embedded security control module (Embedded Secure Access Module, ESAM), magnetic isolation, flash memory (flash memory), backlight, etc., the modules are not started in the battery power supply mode.
In addition, in order to reduce the battery power consumption during low-power consumption abnormal reset, the initialization cannot be simply carried out again, an optimization mechanism is needed, if the nonvolatile memory data is not lost and checked correctly, the nonvolatile memory data is directly used, and the data does not need to be reloaded from the storage. Initializing and starting a first type of module, comprising:
and acquiring storage data from the nonvolatile memory, and initializing and starting the first type module according to the storage data.
By the electric energy meter clock nursing method provided by the embodiment of the application, whether the mains voltage exceeds the preset stable voltage or not is judged, and the preset stable time is kept; if yes, entering a mains supply mode, and initializing mains supply; in the mains supply initialization process, monitoring whether power failure occurs in real time; if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module; the power supply mode of the commercial power is to supply power to the micro control unit through the commercial power supply circuit, and the power supply mode of the battery is to supply power to the micro control unit through the battery power supply circuit. Firstly, the application enters the mains supply mode under the condition that the mains supply voltage exceeds the preset stable voltage and the preset stable time is kept, so that the mains supply can be stably electrified, in addition, in the mains supply initialization stage, whether the power is lost is monitored, if the power is lost, the mains supply is directly exited, and in the mains supply initialization stage, each module does not enter the working state, the quick reset can be realized, and the problems that the mains supply is exited due to overlarge load after the mains supply enters the working state, the battery is started, the battery is frequently started to consume the battery to trigger the low voltage detection reset, and the internal clock is lost are avoided.
According to the above embodiment, the present embodiment provides another solution, namely, a method for nursing a clock of an electric energy meter, wherein the method further includes:
monitoring whether the mains voltage exceeds the preset low-power consumption exit voltage and keeping the preset stable time;
if yes, the battery power supply mode is exited, and the mains supply mode is entered.
In order to timely exit the low-power consumption mode, whether the mains voltage exceeds the preset stable voltage or not needs to be monitored, and the preset stable time is kept, if yes, the battery power supply mode is timely exited, and the mains power supply mode is entered.
The preset low-power consumption exit voltage mentioned in this embodiment may be the same as the preset stable voltage or higher than the preset stable voltage, so that the mains voltage is output as stably as possible and exits from the battery power supply mode.
According to the above embodiment, the present embodiment provides another solution, an electric energy meter clock care method, where the real-time monitoring whether power failure occurs includes:
monitoring whether the output voltage of the mains supply circuit is lower than a preset rated voltage or not;
if yes, judging that power failure occurs;
if not, judging that the power failure does not occur.
In the embodiment, whether power failure occurs is judged by judging whether the output voltage of the mains supply circuit is lower than the preset rated voltage, so that the aim of timely exiting from mains supply initialization is achieved.
According to the above embodiment, the present embodiment provides another solution, an electric energy meter clock care method, and fig. 2 is a circuit diagram of a mains supply circuit provided by the embodiment of the present application, as shown in fig. 2, where the mains supply circuit includes: the power supply chip N1, the switch driving circuit, the first energy storage capacitor E1 and the first resistor R1; the power chip N1 is connected with the switch driving circuit, and the output end of the switch driving circuit is connected with the micro control unit; the power supply pin VCC of the power supply chip N1 is grounded DGND through the first energy storage capacitor E1, and the enable pin EN of the power supply chip N1 is grounded DGND through the first resistor R1;
correspondingly, the method further comprises the steps of:
judging whether the input voltage of the mains supply circuit is lower than a preset voltage threshold or whether the mains supply circuit outputs overload;
if yes, starting the power chip N1;
if the number of times of failure in starting the power chip N1 exceeds a first preset number of times, controlling the power chip N1 to enter a dormant state;
controlling a power supply pin of the power supply chip N1 to charge and discharge until the charge and discharge times reach a second preset times;
and controlling the power chip N1 to exit from the sleep state, and returning to the step of starting the power chip N1.
The switch driving circuit is controlled by the power chip N1, and implements a circuit of a power switch, and in fig. 2, the switch driving circuit includes: the first capacitor C1, the second capacitor C2, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the first NMOS tube VT1 and the fourth diode VD4; the enabling port EN of the power chip N1 is connected with the first end of a sixth resistor R6, the first end of a fifth resistor R5 and the first end of a second capacitor C2, the second end of the sixth resistor R6 is connected with the grid electrode of a first NMOS tube VT1, the source electrode of the first NMOS tube VT1 is connected with the driving pin DRV of the power chip N1, the drain electrode of the first NMOS tube VT1 is connected with the positive electrode of a fourth diode VD4, the negative electrode of the fourth diode VD4 is connected with the first end of the first capacitor C1 and the first end of the fourth resistor R4, and the second end of the fifth resistor R5, the second end of the fourth resistor R4 and the second end of the first capacitor C1 are connected with a mains supply VIN.
In this embodiment, the power chip N1 is connected to the MOS transistor to realize the switching control of the circuit. The MOS tube is a common power switch element, and can adjust the on-off of current by controlling voltage. The power chip N1 can realize power supply and turn-off operation of the circuit by controlling the driving signals of the MOS tube. The output end VOUT is used for realizing power supply output.
In order to prevent the electric energy meter from entering a nursing state, aiming at the harmonic protection problem, a harmonic protection function is added to the power chip N1, and the electric energy meter enters dormancy after three times of startup failure. If the input voltage of the mains supply circuit is lower than the preset voltage threshold or the mains supply circuit outputs overload, the power supply chip N1 fails to start continuously three times, namely the VCC voltage is reduced to the undervoltage threshold continuously three times, the power supply chip N1 enters a sleep mode, the PWM switch stops working, and the VCC pin is repeatedly charged and discharged. When the number of times VCC charge and discharge reaches 256, the power chip N1 exits the sleep mode and tries to restart. If the power chip N1 exits the sleep mode, the power is still continuously started three times, and the power chip N1 enters the sleep mode again.
The repeated charging and discharging of the VCC pin means that after the power chip N1 enters a sleep mode, the stable driving voltage of the grid electrode of the external metal-oxide semiconductor field effect transistor (MOS) is reduced from 11-13V to 3.6-4.5V, so that the first NMOS tube VT1 is thoroughly turned off after VCC charging is completed, and the VCC enters a discharging state.
In addition, the first energy storage capacitor E1 is added at the VCC pin of the power chip N1, so that the heat dissipation time of the thermistor in the restarting process of the electric energy meter can be prolonged, the thermistor can be led out of protection as soon as possible, and the energy storage capacitor can provide additional stable current to meet the transient requirement of the power chip N1, thereby reducing the voltage fluctuation on a power supply line and the harmonic interference generated by noise, and avoiding the electric energy meter from entering a nursing state due to the harmonic to the greatest extent.
For the low-voltage starting condition, a starting voltage dividing resistor R1 is added to the periphery of the power chip N1, so that the starting when the input voltage of the ammeter is too low (about 100V of the lowest starting voltage) can be prevented. At this time, the gate driving voltage=r1×vin/(r1+r5) of the first NMOS VT1 may be obtained by a voltage division formula, so that the first NMOS VT1 needs a higher input voltage VIN to conduct and operate, thereby avoiding the clock loss caused by repeated entry of low power consumption after the ammeter is started when the input voltage is lower.
According to the above embodiment, another solution is provided in this embodiment, and fig. 3 is a circuit diagram of a battery power supply circuit provided in this embodiment, as shown in fig. 3, in a clock care method of an electric energy meter, the battery power supply circuit includes: the second energy storage capacitor E2, the first diode VD1, the second diode VD2, the third diode VD3 and the direct current battery BG1; the battery power supply pin of the micro control unit is connected with the cathode of the first diode VD1 and the cathode of the second diode VD 2; the positive electrode of the first diode VD1 is grounded through a second energy storage capacitor E2, the positive electrode of the second diode VD2 is connected with the positive electrode of the direct current battery BG1, the positive electrode of the first diode VD1 is connected with the negative electrode of the third diode VD3, and the positive electrode of the third diode VD3 is connected with the output end of the alternating current power supply;
The exiting mains initialization includes:
and controlling each module to reset, and supplying power to the micro control unit through the direct current battery or the second energy storage capacitor E2.
The above embodiment mentions that the utility power initialization is that all modules including the first type module and the second type module are powered on successively, and when the utility power initialization is exited, the powered on modules need to be restored to the original state, i.e. each module is reset.
Because the power consumption current is very small in the low-power consumption initialization process, the voltage of the VBAT of the power supply pin of the micro-control unit battery is not influenced; if the power is lost during the mains supply initialization, the reset mains supply initialization process is triggered, and a power consumption path with low power consumption and loading power quantity appears at the moment, and a current consumption with the duration of 2.1S and the size of about 4mA is provided by the direct current battery BG 1. As shown in fig. 3, the dc battery BG1 supplies power to the battery power supply pin VBAT.
If the power-down condition occurs in the multiple mains supply initialization period, the power consumption of the clock battery is serious, the service life of the battery is reduced, the battery voltage is too early to be lower than 2.5V, the MCU cannot be maintained to work normally, and the clock is lost.
In order to optimize the power supply mode of the power consumption current, reduce the electric quantity consumption of the battery and ensure the service life of the battery, the invention provides that a second energy storage capacitor E2 is added in the electric energy meter, and when the voltage of the second energy storage capacitor E2 is higher than that of the direct current battery BG1, the energy storage capacitor is powered by the MCU in preference to the clock battery by utilizing the unidirectional conductivity of the diode.
In addition, the method enters a mains supply mode and further comprises the following steps:
and charging the second energy storage capacitor E2 with commercial power through the alternating current power supply output end.
Because the energy storage capacitor can be charged repeatedly when the electric meter is powered on by using the mains supply, the voltage VBAT for maintaining the normal work of the MCU can be ensured to be more than 2.5V all the time in the restarting process of each power failure, and thus the power consumption current provided by the battery in the initialization stage is changed to be provided by the energy storage capacitor, and the problem of clock loss caused by the fact that the MCU does not work is avoided.
The battery powered circuit further includes: a second resistor R2; the positive electrode of the second diode VD2 is connected with the positive electrode of the dc battery BG1 through the second resistor R2;
correspondingly, the power is supplied to the micro control unit through the direct current battery or the second energy storage capacitor E2, and then the micro control unit further comprises:
judging whether voltage drop exists at two ends of the second resistor R2 or not;
if yes, power is supplied to the micro control unit through the direct current battery currently;
if not, power is supplied to the micro control unit through the second energy storage capacitor E2 currently.
In addition, the invention connects in series a second resistor R2 at the positive electrode of the battery, whether the battery has power consumption and whether the voltage of the peripheral energy storage capacitor is lower than the voltage of the battery can be judged by observing the voltage drop at the two ends of the resistor through single power failure, so as to determine whether the battery is currently powered by the second energy storage capacitor E2 or the battery, and realize the monitoring of the power supply mode.
In addition, the circuit further includes: a third resistor R3;
one end of the third resistor R3 is connected with the positive electrode of the first diode VD1, and the other end of the third resistor R3 is connected with the negative electrode of the third diode VD 3. The stability of the circuit can be improved by connecting the resistors. It can prevent over-current or over-temperature conditions in the circuit from occurring, thereby protecting the diodes and other components.
In the above embodiments, the method for nursing the clock of the electric energy meter is described in detail, and the application also provides a corresponding embodiment of the device for nursing the clock of the electric energy meter. It should be noted that the present application describes an embodiment of the device portion from two angles, one based on the angle of the functional module and the other based on the angle of the hardware.
Based on the angle of functional module, be applied to the electric energy meter, the electric energy meter includes: the device comprises a micro control unit, a battery power supply circuit and a mains supply circuit; the micro control unit is connected with the battery power supply circuit and the mains supply circuit;
fig. 4 is a block diagram of a clock care device for an electric energy meter according to an embodiment of the present application, as shown in fig. 4, where the device includes:
a judging module 21, configured to judge whether to access to the mains supply; if yes, the utility power initialization module 22 is triggered;
The utility power initializing module 22 is configured to enter a utility power supply mode for initializing utility power;
the monitoring module 23 is used for monitoring whether power failure occurs in real time in the mains supply initialization process;
the battery power supply initialization module 24 is configured to exit from the mains supply initialization if power failure occurs, enter a battery power supply mode, initialize and start a first type module, and close a second type module, where the first type module has a higher priority than the second type module;
the utility power supply mode is to supply power to the micro control unit through the utility power supply circuit, and the battery power supply mode is to supply power to the micro control unit through the battery power supply circuit.
The electric energy meter clock nursing method is used for judging whether the mains voltage exceeds a preset stable voltage and keeps the preset stable time; if yes, entering a mains supply mode, and initializing mains supply; in the mains supply initialization process, monitoring whether power failure occurs in real time; if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module; the power supply mode of the commercial power is to supply power to the micro control unit through the commercial power supply circuit, and the power supply mode of the battery is to supply power to the micro control unit through the battery power supply circuit. Firstly, the application enters the mains supply mode under the condition that the mains supply voltage exceeds the preset stable voltage and the preset stable time is kept, so that the mains supply can be stably electrified, in addition, in the mains supply initialization stage, whether the power is lost is monitored, if the power is lost, the mains supply is directly exited, and in the mains supply initialization stage, each module does not enter the working state, the quick reset can be realized, and the problems that the mains supply is exited due to overlarge load after the mains supply enters the working state, the battery is started, the battery is frequently started to consume the battery to trigger the low voltage detection reset, and the internal clock is lost are avoided.
Since the embodiments of the apparatus portion and the embodiments of the method portion correspond to each other, the embodiments of the apparatus portion are referred to the description of the embodiments of the method portion, and are not repeated herein.
Fig. 5 is a block diagram of another clock care device for an electric energy meter according to an embodiment of the present application, where, as shown in fig. 5, the clock care device for an electric energy meter includes: a memory 30 for storing a computer program;
the processor 31 is configured to implement the steps of the method for acquiring user operation habit information according to the above-described embodiment (electric energy meter clock care method) when executing the computer program.
The electric energy meter clock nursing device provided by the embodiment can comprise, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer or the like.
Processor 31 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 31 may be implemented in hardware in at least one of a digital signal processor (Digital Signal Processor, DSP), a Field programmable gate array (Field-Programmable Gate Array, FPGA), a programmable logic array (Programmable Logic Array, PLA). The processor 31 may also comprise a main processor, which is a processor for processing data in an awake state, also called central processor (Central Processing Unit, CPU), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 31 may be integrated with an image processor (Graphics Processing Unit, GPU) for rendering and rendering of content required to be displayed by the display screen. In some embodiments, the processor 31 may also include an artificial intelligence (Artificial Intelligence, AI) processor for processing computing operations related to machine learning.
Memory 30 may include one or more computer-readable storage media, which may be non-transitory. Memory 30 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 30 is at least used for storing a computer program 301, where the computer program, when loaded and executed by the processor 31, can implement the relevant steps of the clock care method of the electric energy meter disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 30 may further include an operating system 302, data 303, and the like, where the storage manner may be transient storage or permanent storage. The operating system 302 may include Windows, unix, linux, among other things. The data 303 may include, but is not limited to, data related to implementing a power meter clock care method, and the like.
In some embodiments, the electric energy meter clock nursing device can further comprise a display screen 32, an input/output interface 33, a communication interface 34, a power supply 35 and a communication bus 36.
Those skilled in the art will appreciate that the configuration shown in fig. 5 is not limiting of the power meter clock care device and may include more or fewer components than shown.
The electric energy meter clock nursing device provided by the embodiment of the application comprises a memory and a processor, wherein the processor can realize the following method when executing a program stored in the memory: the electric energy meter clock nursing method is used for judging whether the mains voltage exceeds a preset stable voltage and keeps the preset stable time; if yes, entering a mains supply mode, and initializing mains supply; in the mains supply initialization process, monitoring whether power failure occurs in real time; if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module; the power supply mode of the commercial power is to supply power to the micro control unit through the commercial power supply circuit, and the power supply mode of the battery is to supply power to the micro control unit through the battery power supply circuit. Firstly, the application enters the mains supply mode under the condition that the mains supply voltage exceeds the preset stable voltage and the preset stable time is kept, so that the mains supply can be stably electrified, in addition, in the mains supply initialization stage, whether the power is lost is monitored, if the power is lost, the mains supply is directly exited, and in the mains supply initialization stage, each module does not enter the working state, the quick reset can be realized, and the problems that the mains supply is exited due to overlarge load after the mains supply enters the working state, the battery is started, the battery is frequently started to consume the battery to trigger the low voltage detection reset, and the internal clock is lost are avoided.
Finally, the application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps described in the above embodiments of the electric energy meter clock care method.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium for performing all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The computer readable storage medium provided in this embodiment has a computer program stored thereon, which when executed by a processor, can implement the following method: the electric energy meter clock nursing method is used for judging whether the mains voltage exceeds a preset stable voltage and keeps the preset stable time; if yes, entering a mains supply mode, and initializing mains supply; in the mains supply initialization process, monitoring whether power failure occurs in real time; if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module; the power supply mode of the commercial power is to supply power to the micro control unit through the commercial power supply circuit, and the power supply mode of the battery is to supply power to the micro control unit through the battery power supply circuit. Firstly, the application enters the mains supply mode under the condition that the mains supply voltage exceeds the preset stable voltage and the preset stable time is kept, so that the mains supply can be stably electrified, in addition, in the mains supply initialization stage, whether the power is lost is monitored, if the power is lost, the mains supply is directly exited, and in the mains supply initialization stage, each module does not enter the working state, the quick reset can be realized, and the problems that the mains supply is exited due to overlarge load after the mains supply enters the working state, the battery is started, the battery is frequently started to consume the battery to trigger the low voltage detection reset, and the internal clock is lost are avoided.
The method, the device and the medium for nursing the clock of the electric energy meter are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
It should also be noted that in this specification, 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. Moreover, 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. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. An electric energy meter clock nursing method is applied to an electric energy meter, and the electric energy meter comprises: the device comprises a micro control unit, a battery power supply circuit and a mains supply circuit; the micro control unit is connected with the battery power supply circuit and the mains supply circuit;
characterized in that the method comprises:
judging whether the mains voltage exceeds a preset stable voltage and keeping the preset stable time;
if yes, entering a mains supply mode, and initializing mains supply;
in the mains supply initialization process, monitoring whether power failure occurs in real time;
if power failure occurs, exiting from the mains supply initialization, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module;
the battery power supply mode is to supply power to the micro control unit through the battery power supply circuit;
wherein, the commercial power supply circuit includes: the power supply chip, the switch driving circuit, the first energy storage capacitor and the first resistor; the power chip is connected with the switch driving circuit, and the output end of the switch driving circuit is connected with the micro control unit; the power supply pin of the power supply chip is grounded through the first energy storage capacitor, and the enabling pin of the power supply chip is grounded through the first resistor;
Correspondingly, the method further comprises the steps of:
judging whether the input voltage of the mains supply circuit is lower than a preset voltage threshold or whether the mains supply circuit outputs overload;
if yes, starting the power chip;
if the number of times of failure in starting the power chip exceeds a first preset number of times, controlling the power chip to enter a dormant state;
controlling a power supply pin of the power supply chip to charge and discharge until the charge and discharge times reach a second preset time;
controlling the power chip to exit from the sleep state and returning to the step of starting the power chip;
the switch driving circuit includes: the first capacitor, the second capacitor, the fourth resistor, the fifth resistor, the sixth resistor, the first NMOS tube and the fourth diode; the enabling port of the power chip is connected with the first end of the sixth resistor, the first end of the fifth resistor and the first end of the second capacitor, the second end of the sixth resistor is connected with the grid electrode of the first NMOS tube, the source electrode of the first NMOS tube is connected with the driving pin of the power chip, the drain electrode of the first NMOS tube is connected with the positive electrode of the fourth diode, the negative electrode of the fourth diode is connected with the first end of the first capacitor and the first end of the fourth resistor, the second end of the fifth resistor, the second end of the fourth resistor and the second end of the first capacitor are connected with the mains supply, and the second end of the second capacitor is grounded.
2. The method of claim 1, wherein the entering the battery-powered mode, then further comprises:
monitoring whether the mains voltage exceeds a preset low-power consumption exit voltage and maintaining the preset stable time;
if yes, the battery power supply mode is exited, and the mains supply mode is entered.
3. The method of claim 1, wherein the real-time monitoring of whether a power loss occurs comprises:
monitoring whether the output voltage of the mains supply circuit is lower than a preset rated voltage or not;
if yes, judging that power failure occurs;
if not, judging that the power failure does not occur.
4. The method of claim 1, wherein the battery powered circuit comprises: the second energy storage capacitor, the first diode, the second diode, the third diode and the direct current battery; the battery power supply pin of the micro control unit is connected with the cathode of the first diode and the cathode of the second diode; the positive electrode of the first diode is grounded through a second energy storage capacitor, the positive electrode of the second diode is connected with the positive electrode of the direct current battery, the negative electrode of the direct current battery is grounded, the positive electrode of the first diode is connected with the negative electrode of the third diode, and the positive electrode of the third diode is connected with the output end of the alternating current power supply;
The exiting mains initialization includes:
and controlling each module to reset, and supplying power to the micro control unit through the direct current battery or the second energy storage capacitor.
5. The method of claim 4, wherein entering a mains power mode, and thereafter further comprises:
and charging the second energy storage capacitor with commercial power through the alternating current power supply output end.
6. The method of claim 4, wherein the battery powered circuit further comprises: a second resistor; the positive electrode of the second diode is connected with the positive electrode of the direct current battery through the second resistor;
correspondingly, the power is supplied to the micro control unit through the direct current battery or the second energy storage capacitor, and then the micro control unit further comprises:
judging whether voltage drop exists at two ends of the second resistor or not;
if yes, power is supplied to the micro control unit through the direct current battery currently;
if not, power is supplied to the micro control unit through the second energy storage capacitor currently.
7. An electric energy meter clock care device applied to the electric energy meter of claim 1, characterized in that the device comprises:
the judging module is used for judging whether the commercial power is accessed; if yes, triggering a mains supply initialization module;
The mains supply initialization module is used for entering a mains supply mode to initialize the mains supply;
the monitoring module is used for monitoring whether power failure occurs in real time in the mains supply initializing process;
the battery power supply initialization module is used for exiting from the mains supply initialization if power failure occurs, entering a battery power supply mode, initializing and starting a first type module, and closing a second type module, wherein the first type module has a higher priority than the second type module;
the battery power supply mode is to supply power to the micro control unit through the battery power supply circuit;
further comprises:
judging whether the input voltage of the mains supply circuit is lower than a preset voltage threshold or whether the mains supply circuit outputs overload;
if yes, starting the power chip;
if the number of times of failure in starting the power chip exceeds a first preset number of times, controlling the power chip to enter a dormant state;
controlling a power supply pin of the power supply chip to charge and discharge until the charge and discharge times reach a second preset time;
and controlling the power chip to exit from the sleep state, and returning to the step of starting the power chip.
8. An electric energy meter clock care device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the electric energy meter clock care method according to any one of claims 1 to 6 when executing said computer program.
9. A computer readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, implements the steps of the electric energy meter clock care method according to any of claims 1 to 6.
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