Three-phase electric energy meter slave

Abstract

The utility model discloses a three-phase electric energy meter slave which comprises a control module, a metering module, a storage module, a mode control module and three circuit switch modules. The three circuit switch modules are respectively connected in series with an A phase, a B phase and a C phase of a three-phase circuit; the control module is used for outputting a state control signal, and the circuit switch module is switched on or off in response to the state control signal; the mode control module comprises a mode selection end, a state signal input end, three state signal output ends in one-to-one correspondence with the three circuit switch modules, a first mode channel and a second mode channel; the state signal input end is electrically connected with the control module, and the three state signal output ends are electrically connected with the three circuit switch modules in a one-to-one correspondence manner; the control module independently sends a state control signal to any circuit switch module through a first mode channel; and the state control signal is sent to all the circuit switch modules through the second mode channel. The working modes of the three-phase electric energy meter slave are diversified, and the use performance is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric energy meter, especially a kind of three-phase electric energy meter slave. BACKGROUND

[0002] Electric energy meter has electric energy measurement, data processing, real-time detection, remote control and information interaction and other functions, and has wide application in various power consumption scenarios.

[0003] Three-phase electric energy meter slave can be used in cooperation with three-phase electric energy meter master, and three-phase electric energy meter slave is responsible for the current, voltage, power and electric quantity and other measurements flowing through and then transmits to master for display. A three-phase electric energy meter master can be combined with multiple three-phase electric energy meter slaves to work, so as to save the cost of multi-loop measurement.

[0004] However, the working mode of three-phase electric energy meter slave in the related art is single, and the use performance needs to be improved. INVENTION CONTENTS

[0005] The utility model provides a kind of three-phase electric energy meter slave, and the working mode of three-phase electric energy meter slave is various, and use performance is higher.

[0006] According to an aspect of the utility model, a kind of three-phase electric energy meter slave is provided, including control module, measurement module, storage module, mode control module and three circuit switch modules;

[0007] The measurement module is connected in three-phase circuit, and the measurement module is also connected with the control module, and the measurement module is used to measure the state data of the three-phase circuit;The storage module is electrically connected with the control module, for storing at least part of the state data;

[0008] The three circuit switch modules are respectively connected in series in the A phase, B phase and C phase of three-phase circuit;

[0009] The control module is used to output state control signal, and the circuit switch module is used to respond to the state control signal and turn on or turn off;

[0010] The mode control module includes mode selection end, state signal input end, three state signal output ends corresponding to the three circuit switch modules, first mode channel and second mode channel;The state signal input end is electrically connected with the control module, and the three state signal output ends are electrically connected with the three circuit switch modules one by one;The control module sends the state control signal to any circuit switch module through the first mode channel;The control module also sends the state control signal to all circuit switch modules through the second mode channel.

[0011] Optionally, the first mode channel comprises:

[0012] a first mode enabling switch, and three switch units corresponding to the three state signal output terminals one by one;

[0013] a control terminal of the first mode enabling switch is electrically connected with the mode selection terminal, a first terminal of the first mode enabling switch is electrically connected with the state signal input terminal, and a second terminal of the first mode enabling switch is electrically connected with a first terminal of the switch unit;

[0014] a second terminal of the switch unit is electrically connected with the corresponding state signal output terminal, and a control terminal of the switch unit is electrically connected with the control module.

[0015] Optionally, the second mode channel comprises:

[0016] a second mode enabling switch, a control terminal of the second mode enabling switch is electrically connected with the mode selection terminal, a first terminal of the second mode enabling switch is electrically connected with the state signal input terminal, and a second terminal of the second mode enabling switch is electrically connected with the three state signal output terminals.

[0017] Optionally, the second mode channel further comprises three delay units corresponding to the three state signal output terminals one by one; the second terminal of the second mode enabling switch is electrically connected with the state signal output terminal through the corresponding delay unit, and a delay configuration terminal of the delay unit is electrically connected with the control module.

[0018] Optionally, the mode selection terminal is electrically connected with the control module.

[0019] Optionally, the first mode enabling switch comprises a first type transistor, the second mode enabling switch comprises a second type transistor, and the first type is different from the second type.

[0020] Optionally, the slave three-phase electric energy meter further comprises an isolation module;

[0021] the metering module is communicatively connected with the control module through the isolation module.

[0022] Optionally, the circuit switch module comprises:

[0023] a relay driving unit and a relay;

[0024] an input terminal of the relay driving unit is electrically connected with the corresponding state signal output terminal, an output terminal of the relay driving unit is electrically connected with a coil of the relay, and a switch of the relay is connected in series in the three-phase circuit.

[0025] Optionally, the storage module comprises a plurality of first storage areas, each first storage area corresponding to at least one second storage area.

[0026] The second storage area is used for storing the same data as the data stored by the first storage area.

[0027] Optionally, the slave three-phase electric energy meter further comprises:

[0028] an interface module electrically connected with the control module; and / or,

[0029] an indication module electrically connected with the control module.

[0030] The technical scheme of the utility model embodiment adopts the slave three-phase electric energy meter which comprises a control module, a metering module, a storage module, a mode control module and three circuit switch modules; the metering module is connected in a three-phase circuit, the metering module is further in communication connection with the control module, and the metering module is used for metering state data of the three-phase circuit; the storage module is electrically connected with the control module and is used for storing at least part of the state data; the three circuit switch modules are respectively connected in series in phase A, phase B and phase C of the three-phase circuit; the control module is used for outputting a state control signal, and the circuit switch module is used for conducting or turning off in response to the state control signal; the mode control module comprises a mode selection end, a state signal input end, three state signal output ends corresponding to the three circuit switch modules one by one, a first mode channel and a second mode channel; the state signal input end is electrically connected with the control module, and the three state signal output ends are electrically connected with the three circuit switch modules one by one; the control module sends the state control signal to any circuit switch module separately through the first mode channel; the control module further sends the state control signal to all circuit switch modules through the second mode channel. In addition to completing the metering of the state data of the three-phase circuit, the slave three-phase electric energy meter can also separately control any single-phase circuit in the three-phase circuit to conduct or turn off. Alternatively, the slave three-phase electric energy meter can also control the three single-phase circuits to conduct or turn off together. That is to say, the slave three-phase electric energy meter has more working modes, and its application scenarios are more extensive, and its use performance is also higher.

[0031] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0033] Figure 1 A circuit structure schematic diagram of a three-phase electric energy meter slave machine provided by the embodiment of the present application is shown in the figure.

[0034] Figure 2 A circuit structure schematic diagram of a three-phase electric energy meter slave machine provided by the embodiment of the present application is shown in the figure.

[0035] Figure 3 A circuit structure schematic diagram of a three-phase electric energy meter slave machine provided by the embodiment of the present application is shown in the figure.

[0036] Figure 4 A circuit structure schematic diagram of a three-phase electric energy meter slave machine provided by the embodiment of the present application is shown in the figure.

[0037] Figure 5 A circuit structure schematic diagram of a three-phase electric energy meter slave machine provided by the embodiment of the present application is shown in the figure.

[0038] Figure 6 A circuit structure schematic diagram of a three-phase electric energy meter slave machine provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0039] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0040] It should be noted that the terms "first", "second", and the like in the description and in the claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Figure 1 A kind of circuit structure schematic diagram of three-phase electric energy meter slave provided for the embodiments of the utility model, refer to Figure 1 Three-phase electric energy meter slave includes: control module 1, measurement module 2, storage module 3, mode control module 4 and three circuit switch module 5;Measurement module 2 is connected in three-phase circuit, measurement module 2 is also connected with control module 1, and measurement module 2 is used to measure the state data of three-phase circuit;Storage module 3 is electrically connected with control module 1, and storage module 3 is used to store at least part of state data;

[0042] Three circuit switch module 5 is respectively connected in series in the A phase, B phase and C phase of three-phase circuit;Control module 1 is used to output state control signal, and circuit switch module 5 is used to respond to state control signal and turn on or turn off;

[0043] Mode control module 4 includes mode control end d1, state signal input end d2, three state signal output ends d3 corresponding to three circuit switch module 5, first mode channel 41 and second mode channel 42;State signal input end d2 is electrically connected with control module 1, and three state signal output ends d3 are electrically connected with three circuit switch module 5 one by one;Control module 1 sends state control signal to any circuit switch module 5 separately by first mode channel 41;Control module 1 also sends state control signal to all circuit switch module 5 by second mode channel 42.

[0044] Specifically, the metering module 2 is, for example, a metering chip, which is connected in series in the three-phase circuit, that is, the A-phase, the B-phase and the C-phase of the three-phase circuit are all electrically connected with the metering module 2. The metering module 2 can meter the state data of each phase of the A-phase, the B-phase and the C-phase of the three-phase circuit separately, or can meter the total state data of the three-phase circuit. The state data includes, for example, voltage, current, frequency, power factor, forward active energy, reverse active energy, four-quadrant reactive energy and the like. The control module 1 is, for example, a controller, which can be specifically a single-chip microcomputer, a microcontroller or an FPGA (Field Programmable Gate Array) and the like. The control module 1 can read the state data metered in the metering module 2, and store at least part of the state data into the storage module 3. More specifically, the electric energy data (such as forward active energy, reverse active energy and four-quadrant reactive energy) and the like can be stored into the storage module 3.

[0045] The three circuit switch modules 5 are, for example, an A-phase circuit switch module 51, a B-phase circuit switch module 52 and a C-phase circuit switch module 53. The A-phase circuit switch module 51 is connected in series in the A-phase of the three-phase circuit, and is used for controlling the on-off of the A-phase; the B-phase circuit switch module 52 is connected in series in the B-phase of the three-phase circuit, and is used for controlling the on-off of the B-phase; and the C-phase circuit switch module 53 is connected in series in the C-phase of the three-phase circuit, and is used for controlling the on-off of the C-phase. When the circuit switch module 5 is turned on, the corresponding single-phase circuit is turned on; similarly, when the circuit switch module 5 is turned off, the corresponding single-phase circuit is turned off. The circuit switch module 5 can be turned on or turned off according to the state control signal, for example, when the state control signal is high, the circuit switch module 5 is turned on; when the state control signal is low, the circuit switch module 5 is turned off. Of course, it can also be that when the state control signal is high, the circuit switch module 5 is turned off; when the state control signal is low, the circuit switch module 5 is turned on.

[0046] The state control signal is generated by the control module 1, and is transmitted to the circuit switch module 5 through the mode control module 4. In this embodiment, the mode control module 5 has two working modes, in the first working mode, the first mode channel 41 is enabled, and the second mode channel 42 is not enabled. In the second working mode, the first mode channel 41 is not enabled, and the second mode channel 42 is enabled.

[0047] In the first mode of operation, the first mode channel 41 can send a state control signal to any circuit switch module 5. The first mode of operation can also be understood as a distributed control mode. In other words, the state control signal can correspond to a single single-phase circuit. In the first mode of operation, the mode control module 4 can send a state control signal to any circuit switch module 5, and the three-phase electric energy meter slave can achieve individual control of each single-phase circuit in the three-phase circuit; for example, only controlling the conduction or turn-off of the A phase, only controlling the conduction or turn-off of the B phase, or only controlling the conduction or turn-off of the C phase. Of course, two single-phase circuits can also be controlled simultaneously; in other embodiments, three single-phase circuits in the three-phase circuit can also be controlled simultaneously.

[0048] In the second mode of operation, one state control signal corresponds to all circuit switch modules 5. The second mode of operation can also be understood as a synchronous control mode. In other words, one state control signal corresponds to all circuit switch modules 5. That is, in one control process, all circuit switch modules 5 are turned on or turned off.

[0049] As can be seen from the above, in addition to completing the metering of state data of the three-phase circuit, the three-phase electric energy meter slave of the present embodiment can also individually control the conduction or turn-off of any single-phase circuit in the three-phase circuit. Alternatively, the three-phase electric energy meter slave can also control the conduction or turn-off of the three single-phase circuits together. That is, the three-phase electric energy meter slave has more modes of operation, and its application scenarios are more extensive and its use performance is higher.

[0050] The technical scheme of the embodiment comprises a three-phase electric energy meter slave machine, which comprises a control module, a metering module, a storage module, a mode control module and three circuit switch modules; the metering module is connected to a three-phase circuit, and the metering module is also in communication connection with the control module, and the metering module is used for metering state data of the three-phase circuit; the storage module is electrically connected with the control module, and is used for storing at least part of the state data; the three circuit switch modules are respectively connected in series in phase A, phase B and phase C of the three-phase circuit; the control module is used for outputting a state control signal, and the circuit switch module is used for turning on or turning off in response to the state control signal; the mode control module comprises a mode selection end, a state signal input end, three state signal output ends corresponding to the three circuit switch modules, a first mode channel and a second mode channel; the state signal input end is electrically connected with the control module, and the three state signal output ends are electrically connected with the three circuit switch modules in one-to-one correspondence; the control module sends the state control signal to any circuit switch module through the first mode channel; the control module also sends the state control signal to all circuit switch modules through the second mode channel. In addition to metering the state data of the three-phase circuit, the three-phase electric energy meter slave machine can also individually control any single-phase circuit in the three-phase circuit to turn on or turn off. Alternatively, the three-phase electric energy meter slave machine can also control the three single-phase circuits to turn on or turn off together. That is, the three-phase electric energy meter slave machine has more working modes, and its application scenarios are more extensive, and its use performance is also higher.

[0051] Optionally, with reference back to Figure 1 , the first mode channel 41 comprises a first mode enabling switch 411 and three switch units 412 corresponding to the three state signal output ends d3; the control end of the first mode enabling switch 41 is electrically connected with the mode selection end d1, the first end of the first mode enabling switch 41 is electrically connected with the state signal input end d2, and the second end of the first mode enabling switch 41 is electrically connected with the first end of the switch unit 412; the second end of the second switch unit 412 is electrically connected with the corresponding state signal output end d3, and the control end of the switch unit 412 is electrically connected with the control module 1.

[0052] Specifically, the three switch units 412 include, for example, an A-phase switch unit 412A, a B-phase switch unit 412B, and a C-phase switch unit 412C, respectively. The second end of the A-phase switch unit 412A is electrically connected to the state signal output end d3 of the corresponding A-phase circuit switch module 51, the second end of the B-phase switch unit 412B is electrically connected to the state signal output end d3 of the corresponding B-phase circuit switch module 52, and the second end of the C-phase switch unit 412C is electrically connected to the state signal output end d3 of the corresponding C-phase circuit switch module 53. The switch state of the switch unit 412 is controlled by the control module 1, and the control end of different switch units 412 is electrically connected to different control signal ends of the control module 1, so that the control module 1 can control the conduction and non-conduction of each switch unit 412. When the switch unit 412 is turned on, the second end of the first mode enabling switch 41 is turned on, and the state control signal transmitted on the first mode enabling switch 41 can be transmitted to the circuit switch module 5. In this embodiment, when different signals are input to the mode selection end d1, the conduction states of the first mode enabling switch 41 and the second mode enabling switch 42 are different. For example, when the mode selection end d1 inputs a low level, the first mode enabling switch 41 is turned on, and the second mode enabling switch 42 is turned off. When the mode selection end d1 inputs a high level, the first mode enabling switch 41 is turned off, and the second mode enabling switch 42 is turned on. Therefore, by inputting different signals to the mode selection end d1, the mode control module 4 can be controlled to enter the first working mode or the second working mode. In the first working mode, the first mode enabling switch 41 is turned on, and the state control signal transmitted on the state signal input end d2 can be transmitted to the first end of each switch unit 412. The control module 1 controls the switch state of each switch unit 5, so as to control the conduction state of each circuit switch module 5. Of course, it can be understood that when the three-phase electric energy meter slave controls the conduction or non-conduction of a single-phase circuit, the metering module also separately meters the current, voltage, and electric energy data of the single-phase circuit.

[0053] In addition, each circuit switch module 5 can be a module with a state retention function. For example, after the circuit switch module 5 receives a state control signal and enters a corresponding switch state, if no new state control signal is received, the circuit switch module 5 retains the switch state until a new state control signal is received.

[0054] Optionally, in some embodiments, as shown in Figure 1 the mode selection end d1 is electrically connected to the control module 1, and the control module 1 controls the mode control module 1 to be in the first working mode or the second working mode. For example, the control module 1 sends a low level to the mode selection end d1, so that the mode control module 1 works in the first working mode; the control module 1 sends a high level to the mode selection end d1, so that the mode control module 1 works in the second working mode.

[0055] Optionally, in some other embodiments, the mode selection terminal d1 can also be connected to a separate level output module. This level output module may include, for example, a button that can be operated by the user. When the button is pressed, the level output module outputs a high level to the mode selection terminal d1; when the button is not pressed, the level output module outputs a low level to the mode selection terminal d1. The specific circuit implementations of the level output module are varied and will not be listed here.

[0056] Optionally, continue to refer to Figure 1 The second mode channel 42 includes a second mode enable switch 421. The control terminal of the second mode enable switch 421 is electrically connected to the mode selection terminal d1, the first terminal of the second mode enable switch 421 is electrically connected to the status signal input terminal d2, and the second terminal of the second mode enable switch 421 is electrically connected to the three status signal output terminals d3.

[0057] Specifically, in this embodiment, when the second mode enable switch 421 is turned on, the status control signal output from the status signal output terminal d1 will be transmitted to all status signal output terminals d3, thereby controlling all circuit switch modules 5 to be turned on or off.

[0058] Alternatively, in some implementations, such as Figure 1 As shown, the second terminal of the second mode enable switch 421 is directly electrically connected to the status signal output terminal d3, and the status control signal will be transmitted to all circuit switch modules 5 simultaneously. That is to say, in this embodiment, all circuit switch modules 5 will be turned on and off simultaneously.

[0059] However, since each three-phase energy meter slave unit includes three circuit switch modules 5, and each group of meters contains a maximum of 54 three-phase energy meter slave units, this means that up to 162 circuit switch modules 5 may operate simultaneously. Normal power supply cannot drive so many circuit switch modules 5, which could lead to a power outage.

[0060] Therefore, in some implementations, the mode control module 4 can be configured in the first operating mode. Furthermore, by configuring a certain delay between the turn-on signals of different switching units, the simultaneous operation of all circuit switching modules 5, which would otherwise lead to power shutdown, can be avoided.

[0061] Alternatively, in some other embodiments, such as Figure 2 As shown, Figure 2The utility model discloses a kind of circuit structure schematic diagram of slave of another three-phase electric energy meter for the embodiment of the utility model.

[0062] Specifically, in the embodiment, three delay units 422 are, for example, A-phase delay unit 422A, B-phase delay unit 422B and C-phase delay unit 422C respectively. The second end of the second mode enable switch 421 is electrically connected to the state signal output end d3 of the corresponding A-phase circuit switch module 51 through the A-phase delay unit 422A. The second end of the second mode enable switch 421 is electrically connected to the state signal output end d3 of the corresponding B-phase circuit switch module 51 through the B-phase delay unit 422B. The second end of the second mode enable switch 421 is electrically connected to the state signal output end d3 of the corresponding C-phase circuit switch module 51 through the C-phase delay unit 422C. After the state control signal passes through the second mode enable switch 42, it will first pass through the delay unit 422 and then be transmitted to the corresponding circuit switch module 5. Different delay units 422 can be configured with different delays, so that all circuit switch modules 5 can be prevented from acting simultaneously. For example, the delay between different delay units 422 can be greater than 100ms. In the embodiment, the specific delay value of the delay unit 422 is configured by the control module 1. The delay unit 422 can be at least one of an RC delay circuit, a 555 timer and a CMOS delay circuit.

[0063] Optionally, Figure 3 The utility model discloses a kind of circuit structure schematic diagram of slave of another three-phase electric energy meter for the embodiment of the utility model, refer to Figure 3 . The first mode enable switch 41 includes a first type transistor, and the second mode enable switch 42 includes a second type transistor, and the first type is different from the second type.

[0064] Specifically, the first type is, for example, P-type, and the second type is, for example, N-type. That is to say, the first mode enable switch 41 can include a P-type transistor, and the second mode enable switch 42 includes an N-type transistor. Of course, the first mode enable switch 41 can also include an N-type transistor, and the second mode enable switch 42 includes a P-type transistor. As a result, when the mode selection end d1 inputs a high level, one of the first mode enable switch 41 and the second mode enable switch 42 is turned on, and the other is turned off. Similarly, when the mode selection end d1 inputs a low level, one of the first mode enable switch 41 and the second mode enable switch 42 is turned on, and the other is turned off.

[0065] For the convenience of description, the transistor included in the first mode enabling switch 41 is defined as a first transistor T1, and the transistor included in the second mode enabling switch 42 is defined as a second transistor T2. The first end of the first transistor T1 is the first end of the first mode enabling switch 41, the second end of the first transistor T1 is the second end of the first mode enabling switch 41, and the control end of the first transistor T1 is the control end of the first mode enabling switch 41. The first end of the second transistor T2 is the first end of the second mode enabling switch 42, the second end of the second transistor T2 is the second end of the second mode enabling switch 42, and the control end of the second transistor T2 is the control end of the second mode enabling switch 42.

[0066] Optionally, with reference to Figure 2 , the switch unit 412 includes a third transistor T3, the first end of the third transistor T3 is the first end of the switch unit 412, the second end of the third transistor T3 is the second end of the switch unit 412, and the control end of the third transistor T3 is the control end of the switch unit 412.

[0067] Optionally, Figure 4 Another circuit structure schematic diagram of a slave of a three-phase electric energy meter is provided in the embodiment of the utility model, and the three-phase electric energy meter slave includes a control module 1, a metering module 2 and a switch module 5. Figure 4 The three-phase electric energy meter slave further includes an isolation module 8, and the metering module 2 is in communication connection with the control module 1 through the isolation module 8.

[0068] Specifically, in the related art, the metering module 2 is directly connected with the control module 1. However, the metering module 2 needs to be directly connected with strong electricity, and such a design is very dangerous when a circuit fault occurs. Strong electricity is directly introduced into weak electricity, and people often operate on the weak electricity side, which leads to the direct contact between people and strong electricity and causes safety accidents. In the embodiment, the metering module 2 is isolated from the control module 1 for communication through the setting of the isolation module 8, so as to ensure the safety of electricity use. In some embodiments, the SPI signal lines of the metering module 2 and the control module 1 can be respectively connected to the isolation module 8, so as to complete the isolation communication. The isolation module 8 is, for example, an optical coupling or the like.

[0069] Optionally, Figure 5 Another circuit structure schematic diagram of a slave of a three-phase electric energy meter is provided in the embodiment of the utility model, and the three-phase electric energy meter slave includes a control module 1, a metering module 2 and a switch module 5. Figure 5 The switch module 5 includes a relay driving unit 511 and a relay 512. The input end of the relay driving unit 511 is electrically connected with a corresponding state signal input end d3, the output end of the relay driving unit 511 is electrically connected with the coil of the relay 512, and the switch of the relay 512 is connected in series with the three-phase circuit.

[0070] Specifically, in the embodiment, after receiving the state control signal, the relay driving unit 511 amplifies the state control signal into a driving signal sufficient to control the relay, and then controls the corresponding relay to act, so as to control the on-off of the corresponding single-phase circuit. The relay is, for example, a motor relay.

[0071] Optionally, the storage module 3 comprises a plurality of first storage areas, each of which corresponds to at least one second storage area; the second storage area is used to store the same data as the data stored in the first storage area.

[0072] Specifically, the storage module 3 is, for example, a ferroelectric memory. The storage module 3 can also store the profile information of the slave of the three-phase electric energy meter and other data that needs to be frequently read and written. The data stored in the storage module 3 can be divided into electric energy data and setting data, wherein the electric energy data is further divided into a decimal part and an integer part. Each first storage area stores one kind of data, and there are a plurality of second storage areas in the storage module 3, so that each kind of data is stored at least twice (i.e., both the first storage area and the second storage area store). If one piece of data is wrong, it can be recovered through other areas.

[0073] Optionally, the tail of each storage area stores checksum data, for example, two bytes of checksum data. The checksum data is updated and stored every time data is stored. After each data read, the value calibrated at this time is calculated and compared with the stored calibration value to determine whether they are consistent. If they are not consistent, it is determined that there is a storage error.

[0074] Optionally, Figure 6 Another circuit structure schematic diagram of the slave of the three-phase electric energy meter provided by the embodiment of the utility model, referring to Figure 6 The slave of the three-phase electric energy meter also comprises an interface module 6, which is electrically connected with the control module 1. The interface module 6 is, for example, an RS485 module. The master of the three-phase electric energy meter can read or set the data of the slave of the three-phase electric energy meter through the interface module. Of course, the host computer can also read and set the data of the slave of the three-phase electric energy meter through the interface module 6.

[0075] Optionally, continuing to refer to Figure 6The slave of the three-phase electric energy meter further comprises an indication module 7, which is electrically connected with the control module 1. The indication module 7 comprises, for example, five LED lamps, including three double-color LED lamps and two single-color LED lamps. The three double-color LED lamps respectively display the on-off state of the three circuit switching modules, and when the LED lamp displays green, it indicates that the circuit switching module is open, and when the LED lamp displays red, it indicates that the circuit switching module is closed. The two single-color LED lamps are respectively a light pulse display lamp and a communication lamp. The light pulse display lamp flashes once every time an electric quantity pulse is output. The communication lamp flashes once every time data communication is performed between the slave of the three-phase electric energy meter and an external device, and does not flash if there is no data interaction.

[0076] It should be noted that the control module 1 is also responsible for communicating with the master of the three-phase electric energy meter by using the interface module 6, storing electric energy data to the storage module, and controlling the display of the LED lamp, etc.

[0077] Optionally, with reference back to Figure 6 The slave of the three-phase electric energy meter further comprises a power module 9, which can take power from a three-phase circuit and supply power to other modules in the slave of the three-phase electric energy meter after voltage conversion.

[0078] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, and the present application does not limit this.

[0079] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A slave device for a three-phase energy meter, characterized in that, It includes a control module, a metering module, a storage module, a mode control module, and three circuit switch modules; The metering module is connected to the three-phase circuit and is also communicatively connected to the control module. The metering module is used to measure the status data of the three-phase circuit. The storage module is electrically connected to the control module and is used to store at least a portion of the status data. The three circuit switch modules are connected in series in phases A, B, and C of the three-phase circuit, respectively. The control module is used to output a status control signal, and the circuit switch module is used to turn on or off in response to the status control signal. The mode control module includes a mode selection terminal, a status signal input terminal, three status signal output terminals corresponding one-to-one with the three circuit switch modules, a first mode channel, and a second mode channel. The status signal input terminal is electrically connected to the control module, and the three status signal output terminals are electrically connected one-to-one with the three circuit switch modules. The control module sends the status control signal individually to any one of the circuit switch modules through the first mode channel. The control module also sends the status control signal to all the circuit switch modules through the second mode channel.

2. The slave device of the three-phase energy meter according to claim 1, characterized in that, The first mode channel includes: The first mode enable switch and three switch units that correspond one-to-one with the three state signal output terminals; The control terminal of the first mode enable switch is electrically connected to the mode selection terminal, the first terminal of the first mode enable switch is electrically connected to the status signal input terminal, and the second terminal of the first mode enable switch is electrically connected to the first terminal of the switch unit. The second terminal of the switching unit is electrically connected to the corresponding status signal output terminal, and the control terminal of the switching unit is electrically connected to the control module.

3. The slave device of the three-phase energy meter according to claim 2, characterized in that, The second mode channel includes: The second mode enable switch has its control terminal electrically connected to the mode selection terminal, its first terminal electrically connected to the status signal input terminal, and its second terminal electrically connected to the three status signal output terminals.

4. The slave device of the three-phase energy meter according to claim 3, characterized in that, The second mode channel also includes three delay units that correspond one-to-one with the three status signal output terminals; the second terminal of the second mode enable switch is electrically connected to the status signal output terminal through the corresponding delay unit, and the delay configuration terminal of the delay unit is electrically connected to the control module.

5. The slave device of the three-phase energy meter according to claim 3, characterized in that, The mode selection terminal is electrically connected to the control module.

6. The slave device of the three-phase energy meter according to claim 5, characterized in that, The first mode enable switch includes a first type of transistor, and the second mode enable switch includes a second type of transistor, wherein the first type and the second type are different.

7. The slave device of the three-phase energy meter according to claim 1, characterized in that, The slave unit of the three-phase energy meter also includes an isolation module; The metering module is connected to the control module through the isolation module.

8. The slave device of the three-phase energy meter according to claim 1, characterized in that, The circuit switching module includes: Relay drive unit and relay; The input terminal of the relay driving unit is electrically connected to the corresponding status signal output terminal, and the output terminal of the relay driving unit is electrically connected to the coil of the relay; the switch of the relay is connected in series in the three-phase circuit.

9. The slave device of the three-phase energy meter according to claim 1, characterized in that, The storage module includes multiple first storage areas, and each first storage area corresponds to at least one second storage area; The second storage area is used to store the same data as the data stored in the first storage area.

10. The slave device of the three-phase energy meter according to claim 1, characterized in that, The slave unit of the three-phase energy meter also includes: An interface module is electrically connected to the control module; and / or, The indicator module is electrically connected to the control module.

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