CN105068040B - Electric energy metering device and household appliance using same - Google Patents
Electric energy metering device and household appliance using same Download PDFInfo
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Abstract
The invention discloses an electric energy metering device and a household appliance applying the same, wherein a controller connected with a metering circuit is arranged, the controller calculates calibration parameters according to voltage parameters and current parameters acquired by the metering circuit and the standard values of the voltage parameters and the standard values of the current parameters, and the voltage parameters and the current parameters acquired by the metering circuit are calibrated based on the calibration parameters in a working mode, so that a large-scale calibration device is not needed, and only a power supply and a standard load are needed to automatically calibrate, therefore, the calibration process of the electric energy metering device is greatly simplified, the efficiency is improved, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of metering, in particular to an electric energy metering device and a household appliance using the same.
Background
The electric energy metering device is generally applied to manufacturing of smart meters. The metering of the smart meter requires high metering accuracy, which usually needs to be calibrated by a special large calibration device according to a specified calibration procedure. For the electric energy metering device with relatively low precision requirement, the calibration mode has low efficiency and high cost, and is not beneficial to large-scale production.
Disclosure of Invention
In view of the above, the present invention is directed to an electric energy metering device that does not depend on a calibration stand for calibration and a household appliance using the same.
In a first aspect, there is provided an electric energy metering device comprising:
the metering circuit is used for sampling input voltage and input current of a load to obtain corresponding voltage parameters and current parameters;
the controller is used for calculating calibration parameters according to the acquired voltage parameters and current parameters and the voltage parameter standard values and current parameter standard values, calibrating the acquired voltage parameters and current parameters based on the calibration parameters in a working mode, and calculating and outputting metering parameters according to the calibrated voltage parameters and current parameters;
the voltage parameter standard value and the current parameter standard value are respectively a preset voltage parameter and a preset current parameter of a standard load for calibration;
the controller comprises a memory, and the electric energy metering device takes the standard load as a load in a calibration stage, so as to obtain the voltage parameter standard value and the current parameter standard value according to the input voltage and the input current of the standard load and store the voltage parameter standard value and the current parameter standard value in the memory;
after the electric energy metering device is applied to the household appliance, the load of the electric energy metering device is a function execution device of the household appliance, and the voltage parameter standard value and the current parameter standard value stored in the memory are read for calibration.
Preferably, the metering parameter comprises at least one of an effective voltage, power factor, frequency and an accumulated power consumption of the load over a predetermined period of time.
Preferably, the controller is configured to enter a calibration mode upon receiving a calibration instruction.
Preferably, the controller is configured to calibrate the voltage parameter first, calibrate the current parameter after the voltage parameter is calibrated,
the controller is used for calibrating current parameters, and calibrating voltage parameters after the current parameters are calibrated.
Preferably, the controller is used for periodically acquiring voltage parameters and current parameters, calibrating and calculating metering parameters; or
The acquisition of voltage and current parameters, calibration and calculation of the metering parameters are performed in response to the measurement instructions.
Preferably, the memory is further configured to store the calibration parameters and to store the calculated metrology parameters.
Preferably, the electric energy metering device further includes:
a standby power supply;
the controller switches to a sleep mode when detecting that the voltage parameter is abnormal;
the controller is powered by the standby power supply in a sleep mode to maintain clock operation.
Preferably, the controller switches from the sleep mode back to the working mode when detecting that the voltage parameter returns to normal.
Preferably, the controller is further configured to periodically send the metering parameters over a communication interface, or
The controller is further configured to send the metering parameters over a communication interface in response to a query instruction.
In a second aspect, there is provided a household appliance comprising:
function executing means for executing an inherent function of the home appliance; and
the electric energy metering device is connected between a power supply and the function execution device.
According to the invention, the controller connected with the metering circuit is arranged, the controller calculates the calibration parameters according to the voltage parameters and the current parameters acquired by the metering circuit and the voltage parameter standard values and the current parameter standard values in the calibration mode, and calibrates the voltage parameters and the current parameters acquired by the metering circuit based on the calibration parameters in the working mode, so that the calibration can be automatically carried out only by a power supply and a standard load without a large-scale calibration device, therefore, the calibration process of the electric energy metering device is greatly simplified, the efficiency is improved, and the cost is reduced.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of a household appliance of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electrical energy metering device of an embodiment of the present invention;
FIG. 3 is a schematic diagram of a calibration system for an electric energy metering device of an embodiment of the present invention;
fig. 4 is a state diagram of a controller of the electric energy metering device of the embodiment of the present invention;
FIG. 5 is a flowchart of the controller calibration of the electric energy metering device according to the embodiment of the present invention;
fig. 6 is another state diagram of the controller of the electric energy metering device of the embodiment of the present invention;
fig. 7 is a schematic interface diagram of the household appliance displaying the electric energy metering information according to the embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 1 is a schematic view of a home appliance of an embodiment of the present invention.
In this embodiment, the household appliance may be a high-power household appliance such as an air conditioner, a refrigerator, a water heater, and the like. As shown in fig. 1, the household appliance 1 includes a function execution device 11, an electric energy metering device 12, and a control device 13. Wherein the function performing means 11 is used for performing an inherent function of the household appliance 1. For example, when the household appliance is an air conditioner, the function executing device 11 is the whole cooling/heating and air supply system of the air conditioner. When the household appliance is a refrigerator, the function performing device 11 is a refrigerating and defrosting system of the refrigerator. When the household appliance is a water heater, the function executing device 11 is a heating and heat preserving system thereof. Since the power consumption of the control system is relatively low, the function performing means 11 is a main power consuming component of the household appliance.
The electric energy metering device 12 is connected between the function executing device 11 and the power supply, and is configured to obtain and output a metering parameter, where the metering parameter includes at least one of an effective voltage, a power factor, a frequency, and an accumulated power consumption of the function executing device 11 over a predetermined time period. The control device 13 is connected to the function executing device 11 and the electric energy metering device 12, and is configured to control an operating state of the function executing device 11 according to the metering parameters, or display at least a portion of the metering parameters through the display device 15, or send at least a portion of the metering parameters to the control terminal 2 through the communication device 16. Controlling the function executing device 11 according to the metering parameters can enable the household appliance to automatically save energy. And the display or the transmission of the metering information can enable the user of the household appliance 1 to know the energy consumption state of the household appliance, thereby making more reasonable control selection. This is advantageous for improving the energy saving performance of the home appliance. The communication device 16 may also communicate with the control terminal 2 directly, or communicate with the control terminal 2 through the lan router 4, or communicate with the control terminal 2 through the internet access server 3. The household appliance 1 may further comprise an input device 14 arranged on the body for human-computer interaction.
Fig. 2 is a schematic diagram of an electric energy metering device according to an embodiment of the present invention.
As shown in fig. 2, the electric energy metering device 12 includes a metering circuit 121 and a controller 122.
The metering circuit 121 is configured to sample an input voltage and an input current of a load to obtain a voltage parameter and a current parameter. The load is an electric device to be measured by the electric energy measuring device 12. With the electric energy metering device 12 of the present embodiment, it is necessary to use a standard load having a predetermined input voltage and input current as a load in the calibration stage, and after being applied to the household appliance, the load thereof is the function performing device 11. Specifically, the metering circuit 121 may be formed by a voltage/current sampling integrated circuit and corresponding peripheral circuits.
The controller 122 is configured to calculate a calibration parameter according to the voltage parameter and the current parameter, and the voltage parameter standard value and the current parameter standard value, which are acquired by the metering circuit 121, in a calibration mode, calibrate the voltage parameter and the current parameter, which are acquired by the metering circuit, based on the calibration parameter in an operating mode, and calculate a metering parameter according to the calibrated voltage parameter and the calibrated current parameter. After calculating the metrology parameters, the controller 122 may store or output the metrology parameters via data lines.
And the voltage parameter standard value and the current parameter standard value are respectively a preset voltage parameter and a preset current parameter of a standard load for calibration.
Preferably, the controller 122 may include a memory 122a for storing calibration parameters and storing calculated metrology parameters. Preferably, the memory 122a is an EEPROM (electrically erasable and programmable read only memory).
Fig. 3 is a schematic diagram of a calibration system of the electric energy metering device according to the embodiment of the present invention.
As shown in fig. 3, when the electric energy metering device 12 needs to be calibrated, the electric energy metering device 12 is connected to the standard load 5. After the standard load 5 is powered on, the standard load has preset input voltage and input current, and the corresponding parameters are a voltage parameter standard value and a current parameter standard value. The voltage parameter standard value and the current parameter standard value are stored in the memory 123 in advance. And obtaining calibration parameters according to the voltage parameter standard value and the current parameter standard value and the voltage parameter and the current parameter acquired by the electric energy metering device 12. The calibration parameters are used to calibrate the voltage parameters and the current parameters so that the electric energy metering device 12 provides a more accurate output. The calibration parameters are stored in the memory 122 a.
The energy metering device 12, after being arranged in the household appliance 1, operates in an operating mode after each power-up. The controller 122 acquires the voltage parameter and the current parameter corresponding to the input voltage and the input current of the load through the metering circuit 121, and then reads the calibration parameter pre-stored in the memory 123 to calibrate the voltage parameter and the current parameter, so as to obtain the accurate calibrated voltage parameter and current parameter. Based on the above parameters, the controller 122 may further calculate metering parameters, i.e., at least one of the effective voltage, power factor, frequency, and accumulated power consumption of the load over a predetermined period of time. The calculated metering parameters may be stored in the memory 122a for subsequent reading as needed.
Alternatively, the controller 122 periodically performs the acquisition, calibration and calculation of the voltage parameter and the current parameter in the operating mode, and updates the metering parameter stored in the memory 122a after the calculation is completed, so that the real-time performance of the metering parameter can be ensured.
Optionally, the controller 122 may also perform acquisition of voltage parameters and current parameters, calibration, and calculation of the metering parameters in response to the measurement commands in the operating mode, and update the metering parameters stored in the memory after the calculation is completed. Wherein the measurement instructions may be received via a communication interface of the controller 122. Thereby, more metering operation trigger modes can be provided.
The metering parameters stored in the memory 123 may be periodically transmitted by the controller 122 via a communication interface (e.g. a serial interface) to the control means 13 of the household appliance 1 for further processing.
Therefore, the controller connected with the metering circuit is arranged, the controller calculates calibration parameters according to the voltage parameters and the current parameters acquired by the metering circuit and the voltage parameter standard values and the current parameter standard values in the calibration mode, and calibrates the voltage parameters and the current parameters acquired by the metering circuit based on the calibration parameters in the working mode, so that a large calibration device is not needed, and the calibration can be automatically carried out only by a power supply and a standard load, therefore, the calibration process of the electric energy metering device is greatly simplified, the efficiency is improved, and the cost is reduced.
Alternatively, the electric energy metering device 12 may be set in the calibration mode or the operating mode by, for example, a dial switch provided thereon.
Alternatively, the electric energy metering device 12 may also enter the calibration mode in response to the controller 12 receiving a calibration command through the communication interface, and exit the calibration mode according to the control of the controller 122 after the calibration is finished. Preferably, the communication interface may be a serial interface, which is also a communication interface commonly used by the controller. Therefore, the electric energy metering devices 12 which need to be calibrated can be arranged in batches through the communication interface, and the production efficiency of the point electric energy metering devices is further improved.
Fig. 4 is a state diagram of a controller of the electric energy metering device of the embodiment of the present invention.
As shown in fig. 4, after power-on, the controller 122 periodically detects whether the communication interface receives a calibration command, and if so, enters the calibration mode, and if not, remains in the operating mode. After entering the calibration mode, after the calibration is completed (i.e., after all calibration parameters are calculated), the controller 122 exits the calibration mode and switches to the operating mode.
Fig. 5 is a flowchart of the calibration performed by the controller of the electric energy metering device according to the embodiment of the present invention.
As shown in fig. 5, in the calibration mode, the control flow of the controller includes:
step 510, determining whether the voltage parameter has been calibrated, if not, executing step 520, and if so, executing step 540.
Step 520, calibrating the voltage parameter.
Step 530, determining whether the voltage parameter calibration is successful, if so, executing step 540, otherwise, returning to step 510.
Preferably, whether the calibration for the voltage parameter is successful is indicated by setting a voltage parameter calibration flag.
Step 540, calibrating the current parameter.
And step 550, judging whether the current parameter calibration is successful, if so, exiting the calibration mode, otherwise, returning to the step 510.
Preferably, step 550 may switch the mode of the controller by setting a calibration mode flag or a mode flag.
That is, the controller 122 first performs the voltage parameter calibration in the calibration mode, then performs the current parameter calibration after the voltage parameter calibration is completed, and exits from the calibration mode after the calibration is completed. Since calibration of other parameters often requires the use of voltage parameters, calibrating the voltage parameters first may result in more efficient calibration of other parameters (e.g., current parameters).
It should be understood that the current parameter calibration may be performed first, followed by the voltage parameter calibration.
In a preferred embodiment, the electric energy metering device 12 is powered by the power supply circuit of the household appliance during normal operation. However, in the event of an unexpected fault such as a power outage, the power metering device 12 may switch to being powered by its own backup power supply 123 to ensure that the controller 122 remains operational. To prevent the standby power supply 123 from running out of charge, the controller 122 may enter a sleep mode in such circumstances (e.g., detecting an abnormality in a voltage parameter).
Fig. 6 is another state diagram of the controller of the electric energy metering device according to the embodiment of the present invention.
As shown in fig. 6, after power-on, the controller 122 periodically detects whether the communication interface receives a calibration command, and if so, enters the calibration mode, and if not, remains in the operating mode.
After entering the calibration mode, after the calibration is completed (i.e., after all calibration parameters are calculated), the controller 122 exits the calibration mode and switches to the operating mode.
In the calibration mode or the operating mode, whenever a voltage parameter anomaly is detected (e.g., the voltage parameter is below a predetermined threshold), the controller 122 enters a sleep mode in which the controller 122 does not perform conventional voltage and current parameter acquisition, calibration, and metering parameter calculations, but rather only maintains periodic voltage parameter detection and clock operation. Therefore, the time can be correctly recorded when the power supply or the power supply fails, so that the time-related parameters such as the accumulated power consumption can be still normally calculated after the normal operation is recovered.
In the sleep mode, the controller 122 switches back to the working mode if it detects that the voltage parameter is restored to normal.
Further, the controller 122 may also send metering parameters through its communication interface periodically or in response to a query instruction.
For example, for the home appliance 1, the controller 122 may periodically transmit the metering parameters including the accumulated power consumption amount, the power, and the like to the control device 13. The control device 13 receives the measurement parameters, and transmits them to the display device 14 for display, or transmits them to the control terminal 2 via the communication device 15 for display. The control terminal 2 may be a dedicated remote controller or a general mobile communication terminal communicating with the home appliance 1 through the mobile internet.
For another example, the control device 13 may receive the measurement parameter query instruction through the communication device 15 and forward the query instruction to the controller 122. In response to the query instruction, the controller 122 may send the metering parameters to the control device 13 through the communication interface for further forwarding to the control terminal 2 or the display device 13.
Fig. 7 is a schematic interface diagram of the household appliance displaying the electric energy metering information according to the embodiment of the present invention.
As shown in fig. 7, in the interface, the current power consumption of the day, the change curve of the current daily power consumption of the month, the current power, the current operation power consumption and other statistical information are displayed, and the current power consumption state of the 1-degree electricity expected to be used for 1 hour according to the current operation state is also displayed.
Therefore, the household appliance 1 provided with the electric energy metering device 12 can provide richer information feedback for the user, and is beneficial to helping the user to know the energy consumption state of the household appliance, so that more reasonable or energy-saving control selection is made.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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. An electric energy metering device comprising:
the metering circuit is used for sampling input voltage and input current of a load to obtain corresponding voltage parameters and current parameters;
the controller is used for calculating calibration parameters according to the acquired voltage parameters and current parameters and the voltage parameter standard values and current parameter standard values, calibrating the acquired voltage parameters and current parameters based on the calibration parameters in a working mode, and calculating metering parameters according to the calibrated voltage parameters and current parameters;
the voltage parameter standard value and the current parameter standard value are respectively a preset voltage parameter and a preset current parameter for calibrating a standard load;
the controller comprises a memory, and the electric energy metering device takes the standard load as a load in a calibration stage, so as to obtain the voltage parameter standard value and the current parameter standard value according to the input voltage and the input current of the standard load and store the voltage parameter standard value and the current parameter standard value in the memory;
after the electric energy metering device is applied to the household appliance, the load of the electric energy metering device is a function execution device of the household appliance, and the voltage parameter standard value and the current parameter standard value stored in the memory are read for calibration.
2. The electrical energy metering device of claim 1, wherein the metering parameters include at least one of an effective voltage, power factor, frequency, and an accumulated electrical power consumption over a predetermined period of time of the load.
3. The electrical energy metering device of claim 1, wherein the controller is configured to enter a calibration mode upon receiving a calibration command.
4. The electric energy metering device of claim 1, wherein the controller is configured to perform a voltage parameter calibration, and perform a current parameter calibration after the voltage parameter calibration is completed; or,
the controller is used for calibrating current parameters, and calibrating voltage parameters after the current parameters are calibrated.
5. The electric energy metering device of claim 1, wherein the controller is configured to periodically perform the obtaining, calibration, and calculation of the metering parameters for the voltage parameter and the current parameter; or,
the controller is used for responding to the measurement instruction to acquire and calibrate the voltage parameter and the current parameter and calculate the metering parameter.
6. The electrical energy metering device of claim 5, wherein the memory is further configured to store the calibration parameters and to store the calculated metering parameters.
7. The electric energy metering device of claim 1, further comprising:
a standby power supply;
the controller switches to a sleep mode when detecting that the voltage parameter is abnormal;
the controller is powered by the standby power supply in a sleep mode to maintain clock operation.
8. The electrical energy metering device of claim 7, wherein the controller switches from a sleep mode back to an operational mode upon detecting a return to normal of the voltage parameter.
9. The electrical energy metering device of claim 1, wherein the controller is further configured to periodically transmit the metering parameters over a communication interface; or,
the controller is further configured to send the metering parameters over a communication interface in response to a query instruction.
10. A household appliance comprising:
function executing means for executing an inherent function of the home appliance; and
the electric energy metering device of any one of claims 1-9, connected between a power source and the function performing device.
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| CN107607903B (en) * | 2017-09-19 | 2020-06-05 | 珠海格力电器股份有限公司 | Calibration method and device for electric energy metering equipment |
| CN108445287A (en) * | 2018-04-10 | 2018-08-24 | 南京邮电大学 | A kind of electrical appliance electric energy surveying device |
| CN109596167A (en) * | 2018-12-03 | 2019-04-09 | 四川虹美智能科技有限公司 | A kind of equipment production test method, system and test terminal |
| CN109490596A (en) * | 2018-12-03 | 2019-03-19 | 国网河南省电力公司南阳供电公司 | A kind of electric power metering device |
| CN110285553B (en) * | 2019-07-01 | 2020-12-29 | 珠海格力电器股份有限公司 | Air conditioner power metering method, power detection circuit and air conditioner |
| CN112098923A (en) * | 2020-09-28 | 2020-12-18 | 怀化建南机器厂有限公司 | Smart electric meter calibration method and device |
| CN112946559A (en) * | 2021-02-01 | 2021-06-11 | 宁夏隆基宁光仪表股份有限公司 | Smart electric meter detection method based on power detection |
| CN114019442B (en) * | 2021-10-21 | 2024-07-23 | 深圳市科陆电子科技股份有限公司 | Electric energy metering error calibration verification method, device and storage medium |
| CN114126151A (en) * | 2021-12-15 | 2022-03-01 | 苏州欧普照明有限公司 | Electric parameter calibration method and device of LED power supply, storage medium and LED lamp |
| CN115407143B (en) * | 2022-08-17 | 2024-10-22 | 江苏天合清特电气有限公司 | Calibration system and method for energy storage converter |
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