CN112098713A - Electric energy meter operation control method - Google Patents
Electric energy meter operation control method Download PDFInfo
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- CN112098713A CN112098713A CN202010758047.XA CN202010758047A CN112098713A CN 112098713 A CN112098713 A CN 112098713A CN 202010758047 A CN202010758047 A CN 202010758047A CN 112098713 A CN112098713 A CN 112098713A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/068—Arrangements for indicating or signaling faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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Abstract
The invention discloses an electric energy meter operation control method, wherein the electric energy meter comprises a management core, and the control method comprises the following steps: 1) starting the electric energy meter; 2) judging whether to power on: after the electric energy meter is started, the MCU of the management core judges whether a power failure signal is received, if so, the step 3) is carried out, and if not, the step 4) is carried out; 3) the electric energy meter enters a low power consumption state, if a wake-up signal is received, the step 5) is carried out, and if the wake-up signal is not received, the step 2) is carried out; 4) the MCU of the management core runs the version of the operating system and returns to the step 2 after running for a certain time; 5) and (3) running the bare computer version by the MCU of the management core, and returning to the step 2) after running for a certain time. Compared with the prior art, the invention has the advantages that: the double systems can be operated through the same MCU kernel, the double systems can be operated at a low speed when the power failure occurs, the working current under the condition of power supply of the standby power supply is reduced, and the requirement of low-power operation is met.
Description
Technical Field
The invention relates to an electric power terminal, in particular to an electric energy meter operation control method.
Background
With the rapid development of economy, the automation and intelligence of production and life are more and more depended on by people, and the demand for electric power cannot be kept away. The scale of the power terminal is also continuously expanding as a ring of the grid terminal.
The electric energy meter is an important electric power terminal, a new generation electric power product of state network companies, such as an intelligent Internet of things and a modular terminal are designed based on an operating system, and a key is used for awakening the intelligent meter to read data under the condition of power failure, and a power supply for power failure work of the electric energy meter is derived from an internal battery or a super capacitor.
The ARM-based multi-user intelligent electric energy meter disclosed in the Chinese patent with the application number of 201220297285.6 comprises a software system and hardware, wherein the software system consists of an operating system, a bottom layer driver and application software, the operating system adopts a Microc/OS-II embedded real-time multitask operating system, the electric energy meter consists of a main control board, a communication board, a display board, a relay control board and a power board, a power circuit adopts a transformer to step down and supply power, and the relay control board completes power failure and power supply control; the power panel provides stable and safe current for the whole system.
Since the operating system needs a higher operating frequency, generally above 100MHZ, the corresponding power consumption is large, taking the GD32F450 chip of the M4 core as an example, the operating current of a single chip exceeds 100 mA. In order to meet the requirements, namely the function of waking up meter reading when power is off, a large-capacity super capacitor needs to be configured in design, and although the requirement can be met, the defects are obvious, such as increased cost, increased device layout difficulty and finally reduced cost performance of the whole meter.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an electric energy meter operation control method aiming at the defects in the prior art, so that the requirement of low-power consumption operation can be met at low cost.
The technical scheme adopted by the invention for solving the technical problems is as follows: an operation control method of an electric energy meter, wherein the electric energy meter comprises a management core, and is characterized in that: the MCU kernel of the management core can run an operating system version and a bare computer version, and the control method comprises the following steps:
1) starting the electric energy meter;
2) judging whether to power on: after the electric energy meter is started, the MCU of the management core judges whether a power failure signal is received, if so, the step 3) is carried out, and if not, the step 4) is carried out;
3) the electric energy meter enters a low power consumption state, if a wake-up signal is received, the step 5) is carried out, and if the wake-up signal is not received, the step 2) is carried out;
4) the MCU of the management core runs the version of the operating system and returns to the step 2 after running for a certain time;
5) and (3) running the bare computer version by the MCU of the management core, and returning to the step 2) after running for a certain time.
In order to meet the requirements of real-time performance and low power consumption of the electric energy meter, the operating system version realizes communication, display, metering, control, event recording, load curve recording and electric energy quality analysis, and the bare computer version realizes low-speed communication and display under the conditions of low power consumption sleep and power failure.
In order to enable the operating system version and the bare metal version to share data, the format, the address and the length of the data stored in the operating system version and the bare metal version are the same.
Preferably, the standardized record format of each of the operating system version and the bare metal version is: parameter + data content + CRC.
Preferably, the data of the operating system version and the bare metal version are stored in an external memory.
In order to facilitate detection of a power-down signal, in the step 2), the electric energy meter is provided with a power-down detection chip, the output of the power-down detection chip is connected with an MCU interrupt pin of the management core, if the MCU interrupt pin detects a low level and receives the power-down signal, the power-down signal indicates that power is supplied to a clock battery or a super capacitor in the electric energy meter at the moment, and the step 3 is entered; and if the MCU interrupt pin detects high level and does not receive a power down signal, the electric energy meter is powered by external alternating current at the moment and is in a power-on state, and the step 4) is carried out.
In order to ensure the restarting of the chip, in the step 1), the electric energy meter is started each time in a watchdog delay overflow mode.
Preferably, in step 3), the electric energy meter is awakened by a key.
In order to realize metering, the electric energy meter further comprises a metering core, and the management core acquires the current electric quantity, the clock and the instantaneous quantity from the metering core at regular time.
Preferably, the metering core and the management core exchange data in an SPI mode.
Compared with the prior art, the invention has the advantages that: through making same MCU kernel can operate dual system, can ensure to carry out full speed operation when the power-on state, satisfy the real-time nature demand, can also be when the low-speed operation of falling the electric power, reduce the operating current under the stand-by power supply condition, satisfy the demand of low-power consumption operation.
Drawings
FIG. 1 is a schematic block diagram of an electric energy meter of the present invention;
fig. 2 is a flow chart of the operation control of the electric energy meter according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Referring to fig. 1, the electric energy meter, in this embodiment, is an intelligent electric energy meter, and includes a metering core 1 and a management core 2, and data are interacted between the metering core 1 and the management core 2 in an SPI manner. The management core 2 is powered by a power supply 3, which may be an external power supply or an internal power supply 3.
The metering core 1 has the functions of legal metering, is the same as the conventional electric energy meter, and comprises the steps of realizing the sampling of voltage and current, completing the calculation of power and electric energy, freezing the electric quantity of the last 1 year at intervals of 1 minute and the like.
In operation, the management core 2 periodically (e.g. every minute) acquires the current electricity quantity, clock and instantaneous quantity from the metering core 1 and stores, communicates, displays and controls the current electricity quantity, clock and instantaneous quantity according to the requirements of users.
The electric energy meter bears the function of internet of things, has high-level applications such as Bluetooth communication, electric energy quality analysis and load analysis, and has extremely strong real-time requirements, so that the high-level applications can be met only by a real-time operating system, and the working frequency needs to be more than 100 MHZ. However, in a power-off or power-off wake-up state, only simple data display and communication are needed, the real-time requirement is not very high, a general bare computer program can completely meet the requirement, the operating frequency of 10MHZ can meet the requirement, and the operating power consumption is reduced to one tenth of the original operating power consumption.
For this purpose, the MCU core of the management core 2 runs a dual version software system, i.e. an os version 21 and a bare metal version 22, respectively, and only one version is run at the same time, with the selection of the different versions depending on the power down signal. The operating system version 21 software can control all external devices and perform information interaction with the metering core 1, so that all functions of the electric energy meter under the normal working condition can be realized, including communication, display, metering, control, event recording, load curve recording, electric energy quality analysis and the like. The bare computer version 22 software has the functions of low-power sleep, low-speed communication and display under the condition of non-power grid power supply. And selecting whether to run the operating system version 21 or the bare metal version 22 according to the power failure detection level when the power meter is started every time.
The operating system version 21 is a normal mode, an embedded software system based on the operating system is adopted, the electric energy meter runs at full speed at the moment, the real-time requirement of the electric energy meter is met, the working current of a chip is larger than 100mA, and in the operating system working mode, if power failure awakening is needed and display is continued for 1 minute, the calculation is carried out by using the capacitor discharge differential pressure 2V, and a super capacitor (Q is C x delta U) of more than 3F is needed. The bare computer version 22 is an embedded system based on a bare computer program, an operating system is not started during running, the bare computer program is adopted to realize the required functions, the bare computer software can meet the requirements only by the running speed of a single chip microcomputer 10M, the power consumption is reduced to 10mA, the same 1-minute display time can be realized by a super capacitor of 0.3F, and the requirement of low power consumption is met.
The division of the functions of the operating system version 21 and the bare metal version 22 is performed according to the requirements of the operation scenes of the electric energy meter, the functions required to be realized under the condition of power supply of a power grid and the functions required to be realized under the condition of power outage of the power grid, because the two scenes do not exist at the same time, and the two sets of systems do not need to operate at the same time. In particular, see table 1:
| serial number | Function(s) | Operating system version | Bare metal program version |
| 1 | Communication | Rate of speed>38400bps/s | Rate of speed<2400bps/ |
| 2 | Display device | Screen brushing 50HZ | Screen brushing 25HZ |
| 3 | Metering | Support for | Do not support |
| 4 | Control of | Support for | Do not support |
| 5 | Event logging | Support for | Do not support |
| 6 | Load curve | Support for | Do not support |
TABLE 1 functional partitioning of operating System version and bare Metal version
Although the operating system version 21 and the bare computer version 22 are independently operated systems and are not dependent on each other, the recorded data must be shared, the shared necessary data is homologous, the two systems are required to be incapable of operating simultaneously, and the format, address and length conventions of the stored data are the same. The standardized record data format is as follows, see table 2:
| data 1: parameter + data content + CRC |
| Data 2: parameter + data content + CRC |
| Data 3: parameter + data content + CRC |
| Data 4: parameter + data content + CRC |
| …… |
| Data n-1: parameter + data content + CRC |
| Data n: parameter + data content + CRC |
TABLE 2 data record Format
The data is stored in an external memory, such as an EEPROM, a FLASH and other media, the space allocation length of each record is the same, but each allocation length is required to be larger than the longest record data, each record is divided into three parts, namely a parameter, data and a check, wherein the parameter is 5 bytes and comprises OAD (4bytes) + L (1bytes), and the check CRC (2bytes) is the integral check on the parameter and the data content.
The power failure signal is obtained by detecting whether the working power supply 3 of the electric energy meter is provided by alternating current of an external power grid or an internal super capacitor or a clock battery. In this embodiment, the internal power source may adopt a super capacitor, and the super capacitor is used as a backup power source, and is charged after being rectified and stepped down by the power grid alternating current when being powered on, and is responsible for outputting the power source for the management module to operate after being powered off. The super capacitor outputs energy, under the condition that the capacity of the capacitor is not changed, the positive correlation Q between the discharge capacity and the discharge voltage difference is equal to CU, the charge voltage is ensured to be 5.5V in design, a chip with a wide working range is selected, for example, 1.8-5.5V, and the maximum value of the voltage difference theory can be 3.7V (5.5-1.8).
The power down signal comes from the power down detection chip, the output (power down signal) of the power down detection chip is electrically connected with the interrupt pin of the MCU, when the external voltage > -60% Un, a high level is output, and when the external voltage > -the rest conditions are output, a low level is output, and the power-on time delay is reduced by triggering quick response through interruption. How to detect the power down signal is the prior art in the field, and is not described in detail herein.
The electric energy meter is restarted (started) each time by means of watchdog delay overflow, the restarting of the chip is ensured, a level signal is firstly judged before entering a main process of a program, a currently required system is selected according to the level, referring to fig. 2, and a control flow chart for the operation of the electric energy meter comprises the following steps:
1) starting the electric energy meter;
2) judging whether to power on: starting the electric energy meter, carrying out power failure detection, judging whether a power failure signal is received by the MCU, if the interrupt pin detects a low level, namely receiving the power failure signal, indicating that power is supplied to a clock battery or a super capacitor in the electric energy meter at the moment, and entering the step 2); if the interrupt pin detects a high level, namely a power failure signal is not received, the electric energy meter is powered by external alternating current at the moment and is in a power-on state, and the step 5) is entered;
3) the electric energy meter enters a low power consumption state, the electric energy meter is awakened through a key or other modes, if an awakening signal is received, the step 4) is carried out, and if the awakening signal is not received, the step 2) is carried out;
4) the MCU runs an operating system version 21, the electric energy meter runs at full speed, the electric energy meter comprises electric quantity operation, event recording, electric energy quality analysis, Bluetooth communication and the like, and the MCU returns to the step 2 after running for a certain time;
5) and (3) running the bare machine version 22 by the MCU, running the electric energy meter at a low speed, only processing data display for acquiring current electric quantity data, and returning to the step 2) after running for a certain time.
Claims (10)
1. An operation control method of an electric energy meter, the electric energy meter comprising a management core (2), characterized in that: the MCU kernel of the management core (2) can run an operating system version (21) and a bare machine version (22), and the control method comprises the following steps:
1) starting the electric energy meter;
2) judging whether to power on: after the electric energy meter is started, the MCU of the management core (2) judges whether a power failure signal is received, if so, the step 3) is carried out, and if not, the step 4) is carried out;
3) the electric energy meter enters a low power consumption state, if a wake-up signal is received, the step 5) is carried out, and if the wake-up signal is not received, the step 2) is carried out;
4) the MCU of the management core (2) runs an operating system version (21), and returns to the step 2 after running for a certain time;
5) and (3) running the bare machine version (22) by the MCU of the management core (2), and returning to the step (2) after running for a certain time.
2. The electric energy meter operation control method according to claim 1, characterized in that: the operating system version (21) realizes communication, display, metering, control, event recording, load curve recording and power quality analysis, and the bare computer version (22) realizes low-speed communication and display under the conditions of low-power sleep and power failure.
3. The electric energy meter operation control method according to claim 2, characterized in that: the operating system version (21) and the bare metal version (22) store data in the same format, address and length.
4. The electric energy meter operation control method according to claim 3, characterized in that: each data standardized record format of the operating system version (21) and the bare metal version (22) is as follows: parameter + data content + CRC.
5. The electric energy meter operation control method according to claim 3, characterized in that: the data of the operating system version (21) and the bare metal version (22) are stored in an external memory.
6. The electric energy meter operation control method according to claim 1, characterized in that: in the step 2), the electric energy meter is provided with a power failure detection chip, the output of the power failure detection chip is connected with an MCU interrupt pin of the management core (2), if the MCU interrupt pin detects a low level and receives a power failure signal, the power failure signal indicates that power is supplied to a clock battery or a super capacitor in the electric energy meter at the moment, and the step 3 is carried out; and if the MCU interrupt pin detects high level and does not receive a power down signal, the electric energy meter is powered by external alternating current at the moment and is in a power-on state, and the step 4) is carried out.
7. The electric energy meter operation control method according to claim 1, characterized in that: in the step 1), the electric energy meter is started in a watchdog time-delay overflow mode every time.
8. The electric energy meter operation control method according to claim 1, characterized in that: in the step 3), the electric energy meter is awakened in a key mode.
9. The electric energy meter operation control method according to any one of claims 1 to 8, characterized by comprising: the electric energy meter also comprises a metering core (1), and the management core (2) acquires the current electric quantity, the clock and the instantaneous quantity from the metering core (1) at regular time.
10. The electric energy meter operation control method according to claim 9, characterized in that: and data are interacted between the metering core (1) and the management core (2) in an SPI mode.
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Cited By (3)
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| CN112946562A (en) * | 2021-02-07 | 2021-06-11 | 南方电网数字电网研究院有限公司 | Power failure protection method and device for double-core intelligent electric meter and double-core intelligent electric meter |
| CN114217123A (en) * | 2021-11-03 | 2022-03-22 | 威胜集团有限公司 | Low-power-consumption display method and device, electric energy meter and computer-readable storage medium |
| CN115728546A (en) * | 2022-11-03 | 2023-03-03 | 佳源科技股份有限公司 | Low-power-consumption processing method for electric energy meter in power-down awakening mode |
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