CN111505561A - Metering simulation circuit and IR46 electric energy meter working condition simulation device - Google Patents
Metering simulation circuit and IR46 electric energy meter working condition simulation device Download PDFInfo
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- CN111505561A CN111505561A CN202010357374.4A CN202010357374A CN111505561A CN 111505561 A CN111505561 A CN 111505561A CN 202010357374 A CN202010357374 A CN 202010357374A CN 111505561 A CN111505561 A CN 111505561A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The application discloses measurement simulation circuit includes: the voltage sampling circuit and the current sampling circuit are connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of the metering MCU; the voltage sampling circuit is used for sampling a voltage signal; the current sampling circuit is used for sampling a current signal; and the metering MCU is used for calculating the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse. The metering simulation circuit can realize the simulation of the operation of the metering function of the electric energy meter under the condition that the metering MCU of the electric energy meter integrates the metering function. The application also discloses an IR46 electric energy meter working condition simulation device, which has the technical effects.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a metering simulation circuit; the utility model also relates to an IR46 electric energy meter operating mode simulation device.
Background
The IR46 electric energy meter working condition simulation device controls the FPGA to simulate chips such as a clock, a metering chip and a storage chip in the tested IR46 electric energy meter through commands of the upper computer, performs signal transmission with a single chip microcomputer of a core board of the tested IR46 electric energy meter, simulates real input required by the running of software of the tested IR46 electric energy meter, and records an output result of the running of the software. The hardware mainly completes the interface connection of the peripheral equipment, and the functions of test execution, test monitoring and data processing of the peripheral equipment are realized by software.
Referring to fig. 1a, the IR46 electric energy meter working condition simulation device mainly comprises a main control MCU and an FPGA, peripheral chips of the main control MCU such as a metering chip and a storage chip of the IR46 electric energy meter are simulated by the FPGA, and communication and data interaction are performed with a management MCU or a metering MCU on an IR46 core board by controlling internal registers and signal interfaces of the peripheral chips, so as to perform real-time monitoring on the signals. Meanwhile, values of related chip registers can be changed through the FPGA, fault injection signals are simulated, and the software quality of the IR46 electric energy meter can be evaluated by matching with an IR46 electric energy meter software test case.
Referring to fig. 1b, in the conventional IR46 electric energy meter working condition simulation apparatus, a FPGA simulates a metering chip, a voltage and current sampling circuit is skipped over, a command is directly sent to the FPGA through a main control MCU chip, the metering chip simulated by the FPGA outputs a CF electric energy pulse signal to a metering MCU of an IR46 core board, and the metering MCU accumulates and stores electric energy according to the CF electric energy pulse signal to simulate the operation of the metering function of the electric energy meter.
However, for the electric energy meter with the independent metering chip, the metering function of the electric energy meter can be simulated in the above manner, but for the electric energy meter with the SOC chip integrating the metering function of the metering chip in the metering MCU, the metering function of the electric energy meter cannot be simulated in the above manner, because the metering function of the metering chip is integrated when the SOC chip is disposed in the metering MCU, and the IR46 electric energy meter using the metering MCU does not need to use the metering chip, so the IR46 electric energy meter condition simulation device cannot output the CF electric energy pulse signal to the metering MCU by simulating the metering chip, and cannot simulate the metering function of the electric energy meter in the above manner.
In view of this, how to realize the simulation of the operation of the metering function of the electric energy meter under the condition that the metering MCU of the electric energy meter integrates the metering function has become a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The application aims to provide a metering simulation circuit which can realize the simulation of the metering function of an electric energy meter under the condition that a metering MCU of the electric energy meter integrates the metering function; the other purpose of the present application is to provide an IR46 electric energy meter condition simulation device, all having the above technical effects.
In order to solve the above technical problem, the present application provides a metering simulation circuit, including:
the voltage sampling circuit and the current sampling circuit are connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of the metering MCU;
the voltage sampling circuit is used for sampling a voltage signal;
the current sampling circuit is used for sampling a current signal;
and the metering MCU is used for calculating the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse.
Optionally, the voltage sampling circuit includes:
a power frequency transformer and a resistance voltage division circuit; the resistance voltage division circuit comprises a first voltage division resistor and a second voltage division resistor which are connected in series;
the primary coil of the power frequency transformer is connected with an input power supply, the secondary coil of the power frequency transformer is connected with the voltage dividing circuit, and the voltage value of the first voltage dividing resistor in the voltage dividing circuit is used as an input signal of the voltage sampling channel.
Optionally, the transformation ratio of the power frequency transformer is 1 to 1.
Optionally, a voltage division ratio of the first voltage division resistor to the second voltage division resistor is 1 to 1001.
Optionally, the current sampling circuit includes:
the load, the current transformer and the sampling resistor;
the load is connected with the input power supply and the primary winding of the current transformer in series, the secondary winding of the current transformer is connected with the sampling resistor in series, and the voltage value of the sampling resistor is used as the input signal of the current sampling channel.
Optionally, the transformation ratio of the current transformer is 2000 to 1.
Optionally, the load is a cement resistor or an electronic load.
In order to solve the technical problem, the application also provides an IR46 electric energy meter working condition simulation device, wherein the IR46 electric energy meter working condition simulation device is provided with a voltage sampling circuit and a current sampling circuit, the voltage sampling circuit and the current sampling circuit are both connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of a metering MCU of the tested IR46 electric energy meter;
the voltage sampling circuit and the current sampling circuit are respectively used for sampling a voltage signal and a current signal, transmitting the voltage signal and the current signal to the metering MCU, so that the metering MCU calculates the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse.
The application provides a measurement simulation circuit, includes: the voltage sampling circuit and the current sampling circuit are connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of the metering MCU; the voltage sampling circuit is used for sampling a voltage signal; the current sampling circuit is used for sampling a current signal; and the metering MCU is used for calculating the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse. Therefore, the metering simulation circuit provided by the application simulates voltage sampling and current sampling by arranging the voltage sampling circuit and the current sampling circuit, and inputs the voltage sampling signal and the current sampling signal to the metering MCU, so that the metering MCU further performs electric energy metering, and the metering function of the electric energy meter is simulated.
The IR46 electric energy meter working condition simulation device provided by the application also has the technical effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1a is a schematic diagram of a conventional IR46 electric energy meter working condition simulation device;
FIG. 1b is a schematic diagram of a conventional metering scheme;
FIG. 2 is a schematic diagram of a metrology simulation circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of a voltage sampling circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a current sampling circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an IR46 electric meter condition simulation apparatus according to an embodiment of the present application.
Detailed Description
The core of the application is to provide a metering simulation circuit which can realize the simulation of the operation of the metering function of the electric energy meter under the condition that the metering MCU of the electric energy meter integrates the metering function; the other core of the application is to provide an IR46 electric energy meter working condition simulation device which also has the technical effects.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The conventional IR46 electric energy meter working condition simulation device outputs a CF electric energy pulse signal to a metering MCU of an IR46 core board through an FPGA analog metering chip, the metering MCU performs electric energy metering and storage according to the CF electric energy pulse signal, and the operation of the metering function of the electric energy meter is simulated. However, for the electric energy meter of the SOC chip integrating the metering function of the metering chip inside the metering MCU, the metering function of the electric energy meter cannot be simulated in the above manner. In order to solve the technical defects, the application provides a metering simulation circuit which can realize the simulation of the operation of the metering function of the electric energy meter under the condition that the metering MCU of the electric energy meter integrates the metering function.
Referring to fig. 2, fig. 2 is a schematic diagram of a metrology simulation circuit according to an embodiment of the present application, and referring to fig. 2, the metrology simulation circuit includes:
the voltage sampling circuit 10, the current sampling circuit 20 and the metering MCU30, wherein the voltage sampling circuit and the current sampling circuit 20 are both connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of the metering MCU 30;
a voltage sampling circuit 10 for sampling a voltage signal;
a current sampling circuit 20 for sampling a current signal;
and the metering MCU30 is used for calculating the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse.
Specifically, the metering simulation circuit provided by the application mainly comprises a voltage sampling circuit 10, a current sampling circuit 20 and a metering MCU30 integrated with a metering function. The voltage sampling circuit 10 and the current sampling circuit 20 are the constituent structures of the IR46 electric energy meter working condition simulation device, that is, the voltage sampling circuit 10 and the current sampling circuit 20 are added to the IR46 electric energy meter working condition simulation device. The metering MCU30 is a structure on an IR46 core board. The voltage sampling circuit 10 and the current sampling circuit 20 are both connected with an input power supply and a voltage sampling channel and a current sampling channel of the metering MCU 30. The voltage sampling circuit 10 and the current sampling respectively simulate voltage sampling and current sampling, and transmit the sampled voltage signal and current signal to the metering MCU 30.
As shown in fig. 3, in a specific embodiment, the voltage sampling circuit 10 includes: the power frequency transformer T1 and the resistance voltage division circuit; the resistance voltage division circuit comprises a first voltage division resistor R1 and a second voltage division resistor R2 which are connected in series; the primary coil of the power frequency transformer T1 is connected with an input power supply, the secondary coil of the power frequency transformer T1 is connected with a voltage division circuit, and the voltage value of a first voltage division resistor R1 in the voltage division circuit is used as an input signal of a voltage sampling channel.
Specifically, since the voltage of the IR46 typical condition simulation apparatus is the commercial power, that is, the voltage is 220V ac voltage, in view of safety, the voltage sampling circuit 10 in this embodiment is provided with the power frequency transformer T1, so that the voltage sampling circuit 10 is electrically isolated. Specifically, the primary winding of the commercial transformer T1 is connected to a 220V input power supply, and the secondary winding of the commercial transformer T1 is connected to a voltage dividing circuit formed by a first voltage dividing resistor R1 and a second voltage dividing resistor R2 connected in series. In addition, the first voltage-dividing resistor R1 in the voltage-dividing circuit is connected with a voltage sampling channel of the metering MCU30, so that the voltage value of the first voltage-dividing resistor R1 is used as an input signal of the voltage sampling channel.
Further, as a specific embodiment, the voltage dividing ratio of the first voltage dividing resistor R1 to the second voltage dividing resistor R2 is 1 to 1001. The transformation ratio of the power frequency transformer T1 is 1 to 1.
Specifically, in the present embodiment, the transformation ratio of the commercial transformer T1 is set to 1: 1, and the commercial transformer T1 generates an isolated 220V ac voltage, that is, the output of the secondary winding of the commercial transformer T1 is 220V ac voltage. The voltage dividing ratio of the first voltage dividing resistor R1 to the second voltage dividing resistor R2 is set to 1 to 1001, so that the first voltage dividing resistor R1 generates an isolated voltage of 220mV, and thus the voltage sampling circuit 10 inputs a voltage signal of 220mV to the voltage sampling channel of the metering MCU30 on the IR46 core board.
In addition, referring to fig. 4, in a specific embodiment, the current sampling circuit 20 includes: a load R3, a current transformer T2 and a sampling resistor R4; the load R3 is connected in series with an input power supply and a primary winding of a current transformer T2, a secondary winding of the current transformer T2 is connected in series with a sampling resistor R4, and the voltage value of the sampling resistor R4 is used as an input signal of a current sampling channel.
Specifically, in consideration of electrical isolation and power consumption, in the present embodiment, the current sampling circuit 20 specifically includes a load R3, a current transformer T2, and a sampling resistor R4. The load R3 is connected in series with the 220V input power supply of the IR46 electric energy meter working condition simulation device, and meanwhile, the current transformer T2 is sleeved on the power supply input line (live wire) of the load R3, namely the load R3 is connected in series with the input power supply and the primary winding of the current transformer T2. The resistance of the load R3 is approximately 1100 ohms so that the current flowing through the current transformer T2 is approximately 0.2A. The secondary winding of the current transformer T2 is connected in series with a sampling resistor R4, the sampling resistor R4 is connected with the metering MCU30, so that the voltage value of the sampling resistor R4 is used as an input signal of a current sampling channel, the IR46 electric energy meter simulation device also connects the current sampling signal to the current sampling channel of the metering MCU30 on the IR46 core board through an interface, and the voltage value of the sampling resistor R4 is input to the metering MCU 30. The voltage value of the sampling resistor R4 actually reflects the current magnitude, and after the metering MCU30 receives the voltage value of the sampling resistor R4, the corresponding current value can be calculated according to ohm's law.
Further, as a specific embodiment, the load R3 is a cement resistor or an electronic load R3. The transformation ratio of the current transformer T2 is 2000 to 1.
Specifically, the current transformer T2 with a transformation ratio of 2000 to 1 and an accuracy of three thousandths is used in the present embodiment. On the basis that the resistance value of the load R3 is about 1100 ohms, since the primary-side current flowing through the primary winding of the current transformer T2 is about 0.2A, when the transformation ratio of the current transformer T2 is 2000 to 1, the secondary-side current flowing through the secondary winding of the current transformer T2 is about 0.1 mA. Further, the resistance value of the sampling resistor R4 connected in series with the secondary winding of the current transformer T2 is set to 10 ohms, and the voltage across the sampling resistor R4 is about 1mV, so that a 1mV current signal is input to the current input channel of the metering MCU 30.
And the metering MCU30 is used for calculating the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse. Specifically, the metering MCU30 multiplies the effective signal values of the voltage signal and the current signal to calculate the instantaneous power, accumulates the instantaneous power, and further generates the CF pulse when the instantaneous power accumulation reaches a set value, i.e., a unit pulse energy (e.g., 0.01 degrees), and then accumulates the electric energy according to the CF pulse to complete the metering and storing of the electric energy. For example, 100 CF pulses are generated over a period of time, and 1 degree of electricity is consumed over that period of time.
In summary, the metrology simulation circuit provided in the present application includes: the voltage sampling circuit and the current sampling circuit are connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of the metering MCU; the voltage sampling circuit is used for sampling a voltage signal; the current sampling circuit is used for sampling a current signal; and the metering MCU is used for calculating the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse. Therefore, the metering simulation circuit provided by the application simulates voltage sampling and current sampling by arranging the voltage sampling circuit and the current sampling circuit, and inputs the voltage sampling signal and the current sampling signal to the metering MCU, so that the metering MCU further performs electric energy metering, and the metering function of the electric energy meter is simulated.
The application also provides an IR46 electric energy meter working condition simulation device, and as shown in reference to FIG. 5, the IR46 electric energy meter working condition simulation device is provided with a voltage sampling circuit and a current sampling circuit, wherein the voltage sampling circuit and the current sampling circuit are both connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of a metering MCU of the tested IR46 electric energy meter.
And the voltage sampling circuit and the current sampling circuit are respectively used for sampling a voltage signal and a current signal and transmitting the voltage signal and the current signal to the metering MCU, so that the metering MCU calculates the voltage signal and the current signal to obtain instantaneous power, accumulates the instantaneous power, generates a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulates electric energy according to the CF pulse.
For the introduction of the IR46 electric energy meter working condition simulation apparatus provided in the present application, please refer to the embodiment of the above metering simulation circuit, which is not described herein again. In addition, for other structures in the IR46 electric energy meter working condition simulation apparatus, for example, the description of the main control MCU and the like may refer to the existing related technologies, which is not described herein again.
Because the situation is complicated and cannot be illustrated by a list, those skilled in the art can appreciate that there can be many examples in combination with the actual situation under the basic principle of the embodiments provided in the present application and that it is within the scope of the present application without sufficient inventive effort.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The metering simulation circuit and the IR46 electric energy meter working condition simulation device provided by the application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. A metrology simulation circuit, comprising:
the voltage sampling circuit and the current sampling circuit are connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of the metering MCU;
the voltage sampling circuit is used for sampling a voltage signal;
the current sampling circuit is used for sampling a current signal;
and the metering MCU is used for calculating the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse.
2. The metrology simulation circuit of claim 1, wherein the voltage sampling circuit comprises:
a power frequency transformer and a resistance voltage division circuit; the resistance voltage division circuit comprises a first voltage division resistor and a second voltage division resistor which are connected in series;
the primary coil of the power frequency transformer is connected with an input power supply, the secondary coil of the power frequency transformer is connected with the voltage dividing circuit, and the voltage value of the first voltage dividing resistor in the voltage dividing circuit is used as an input signal of the voltage sampling channel.
3. The metering simulation circuit of claim 2, wherein the transformation ratio of the power frequency transformer is 1 to 1.
4. The metering simulation circuit of claim 3, wherein a voltage division ratio of the first voltage division resistor to the second voltage division resistor is 1 to 1001.
5. The metrology simulation circuit of claim 1, wherein the current sampling circuit comprises:
the load, the current transformer and the sampling resistor;
the load is connected with the input power supply and the primary winding of the current transformer in series, the secondary winding of the current transformer is connected with the sampling resistor in series, and the voltage value of the sampling resistor is used as the input signal of the current sampling channel.
6. The metering simulation circuit of claim 5 wherein the current transformer has a transformation ratio of 2000 to 1.
7. The metrology simulation circuit of claim 6 wherein the load is a cement resistor or an electronic load.
8. The IR46 electric energy meter working condition simulation device is characterized in that the IR46 electric energy meter working condition simulation device is provided with a voltage sampling circuit and a current sampling circuit, wherein the voltage sampling circuit and the current sampling circuit are both connected with an input power supply and are respectively connected with a voltage sampling channel and a current sampling channel of a metering MCU of a tested IR46 electric energy meter;
the voltage sampling circuit and the current sampling circuit are respectively used for sampling a voltage signal and a current signal, transmitting the voltage signal and the current signal to the metering MCU, so that the metering MCU calculates the voltage signal and the current signal to obtain instantaneous power, accumulating the instantaneous power, generating a CF pulse when the accumulated value of the instantaneous power reaches a set value, and accumulating electric energy according to the CF pulse.
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| CN202010357374.4A CN111505561A (en) | 2020-04-29 | 2020-04-29 | Metering simulation circuit and IR46 electric energy meter working condition simulation device |
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| CN112444671A (en) * | 2020-10-27 | 2021-03-05 | 深圳市科陆精密仪器有限公司 | Electric energy metering method and device of electric energy meter based on instantaneous power and storage medium |
| CN112986674A (en) * | 2021-04-13 | 2021-06-18 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Three-phase intelligent electric meter with double-core structure |
| CN113466547A (en) * | 2021-07-30 | 2021-10-01 | 国网山东省电力公司德州供电公司 | Electric energy meter metering method suitable for spot market transaction |
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Application publication date: 20200807 |