Electric energy meter type detection circuit and method

Abstract

The present application relates to a phenotype detection circuit and method for an electric energy meter, wherein the phenotype detection circuit comprises: a first detection branch, a second detection branch and a control unit; the first detection branch comprises: a first resistor and a light-emitting diode connected in series; the second detection branch comprises: a photosensitive sensor and a first relay connected in series; one end of the first normally open contact of the first relay is configured to be electrically connected to the positive electrode of the detection power supply, the other end of the first normally open contact is electrically connected to the first input port of the control unit, and the ground end of the control unit is configured to be electrically connected to the negative electrode of the detection power supply; the control unit is configured to determine the phenotype of the electric energy meter to be detected according to the first input signal of the first input port. Based on the phenotype detection circuit, the phenotype detection of the electric energy meter can be quickly realized, thereby improving the detection efficiency and operation safety factor of the electric energy meter.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy meters, and in particular to a meter type detection circuit and method for electric energy meters. Background Art

[0002] According to the requirements of the technical specifications of electric energy meters, electric energy meters use load switches to manage the opening and closing of power lines. The relevant technical specifications divide load switches into two types: internal switches and external switches. The relevant provisions for external load switches are as follows:

[0003] The electric energy meter can control the external load switch in one of the following two ways:

[0004] 1) Two sets of passive non-polarity control switch signals are output from the electric energy meter trip control terminals 14, 15 and 16, and the switch node capacity is AC 250V, 2A (this type of external load switch control method corresponds to the electric energy meter with passive switch external in this application).

[0005] 2) The external load switch with control and feedback signal shall meet the requirements of the Technical Specifications for External Circuit Breakers for Electric Energy Meters (this type of external load switch control method corresponds to the electric energy meter with an external active switch in this application).

[0006] In order to meet the requirements for the actual service life of the energy meter and ensure that the external switch output status of each energy meter is normal during actual operation, the energy meter needs to be tested during the production process. In the existing method for implementing terminal function testing of different meter types, there are technical problems such as slow detection efficiency and low operating safety factor because the meter types are difficult to distinguish. Summary of the invention

[0007] In view of this, the purpose of the embodiments of the present application is to provide a switching power supply protection circuit and a control method thereof, so as to solve the technical problems of slow detection efficiency and low operating safety factor in the existing method for realizing terminal function detection of different phenotypes, because the phenotypes of electric energy meters are difficult to distinguish.

[0008] In a first aspect, an embodiment of the present application provides a meter type detection circuit of an electric energy meter, the meter type detection circuit comprising: a first detection branch, a second detection branch and a control unit;

[0009] The first detection branch comprises: a first resistor and a light-emitting diode connected in series; the positive electrode of the first detection branch is configured to be electrically connected to the first functional terminal of the electric energy meter to be detected, and the negative electrode of the first detection branch is configured to be electrically connected to the negative electrode of the detection power supply; wherein the first functional terminal refers to the control signal output terminal or the trip normally open terminal in the external switch function port of the electric energy meter to be detected;

[0010] The second detection branch comprises: a photosensor and a first relay connected in series; the positive electrode of the second detection branch is configured to be electrically connected to the positive electrode of the detection power supply, and the negative electrode of the second detection branch is configured to be electrically connected to the negative electrode of the detection power supply;

[0011] One end of the first normally open contact of the first relay is configured to be electrically connected to the positive electrode of the detection power supply, the other end of the first normally open contact is electrically connected to the first input port of the control unit, and the ground end of the control unit is configured to be electrically connected to the negative electrode of the detection power supply;

[0012] The control unit is configured to determine the type of the electric energy meter to be detected according to the first input signal of the first input port.

[0013] In the above implementation process, the meter type detection circuit includes: a first detection branch, a second detection branch and a control unit; the positive pole of the first detection branch is electrically connected to the first functional terminal, and the negative pole is electrically connected to the negative pole of the detection power supply; the positive pole of the second detection branch is electrically connected to the positive pole of the detection power supply, and the negative pole is electrically connected to the negative pole of the detection power supply; and the first detection branch includes a first resistor and a light-emitting diode connected in series, and the second detection branch includes a photosensor and a first relay connected in series. When there is power output at the first functional terminal, the light-emitting diode will be driven to emit light, and the photosensor can respond to the light emitted by the light-emitting diode to drive the first relay to operate; and the first normally open contact of the first relay is electrically connected to the positive pole of the detection power supply and the first input port of the control unit respectively; when the first relay is operated, the first normally open contact is closed and transmits a signal to the first input port; the control unit can determine the type of the electric energy meter to be detected based on the received first input signal. The phenotype detection circuit based on the above-mentioned electric energy meter can quickly realize the phenotype detection of the electric energy meter, thereby improving the detection efficiency and operational safety factor of the electric energy meter, and solving the technical problems of slow detection efficiency and low operational safety factor in the existing method for realizing terminal function detection of different phenotypes due to the difficulty in distinguishing the phenotype of the electric energy meter.

[0014] Optionally, in an embodiment of the present application, the meter type detection circuit also includes: a first normally closed contact of the first relay, a second relay, and a second normally open contact and a third normally open contact of the second relay; the second functional terminal of the electric energy meter to be detected is configured to be electrically connected to the positive pole of the detection power supply; the first functional terminal is electrically connected to one end of the second normally open contact, and the other end of the second normally open contact is electrically connected to the second input port of the control unit; the control unit is also configured to determine the first node type between the first functional terminal and the second functional terminal according to the second input signal of the second input port; wherein the second functional terminal refers to an unoccupied terminal or a trip common terminal in the external switch function port; the first The three-function terminal is electrically connected to one end of the third normally open contact, and the other end of the third normally open contact is electrically connected to the third input port of the control unit; the control unit is also configured to determine the second node type between the third function terminal and the second function terminal according to the third input signal of the third input port; wherein the third function terminal refers to the feedback signal terminal or the trip normally closed terminal in the external switch function port; one end of the first normally closed contact is configured to be electrically connected to the positive pole of the detection power supply, and the other end is electrically connected to one end of the second relay; the other end of the second relay is electrically connected to the first output port of the control unit; the control unit is also configured to control the action of the second relay based on the first output signal of the first output port.

[0015] In the above implementation process, the first functional terminal is electrically connected to one end of the second normally open contact, and the other end of the second normally open contact is electrically connected to the second input port; the third functional terminal is electrically connected to one end of the third normally open contact, and the other end of the third normally open contact is electrically connected to the third input port; and one end of the first normally closed contact is electrically connected to the positive pole of the detection power supply, and the other end is electrically connected to the second relay. When the first relay is not actuated (i.e., the electric energy meter to be detected is an electric energy meter with an external passive switch), and the control unit controls the second relay to actuate based on the first output signal, the second normally open contact and the third normally open contact are closed, and the control unit receives the second input signal of the first functional terminal based on the second input port, and receives the third input signal of the third functional terminal based on the third input port; and then the first node type between the first functional terminal and the second functional terminal can be determined according to the second input signal, and the second node type between the third functional terminal and the second functional terminal can be determined according to the third input signal. The connection relationship detection of the first functional terminal, the second functional terminal, and the third functional terminal is realized.

[0016] In addition, since the electric energy meter to be detected is an electric energy meter with an external active switch, it is not necessary to detect the connection relationship between the first functional terminal, the second functional terminal, and the third functional terminal through the node type. In the meter type detection circuit provided by the present application, when the first relay is actuated, the first normally closed contact is disconnected. At this time, even if the control unit outputs the first output signal based on the first output port, it is unable to control the second relay to actuate; in the case where the electric energy meter to be detected is an electric energy meter with an external active switch, the detection function of "detecting the connection relationship between the first functional terminal, the second functional terminal, and the third functional terminal of the electric energy meter with an external passive switch" is locked, which provides a guarantee for the orderly execution of multiple detection functions.

[0017] Optionally, in an embodiment of the present application, the detection power supply includes: a three-phase AC power supply and a low-voltage power supply; the negative pole of the first detection branch is configured to be electrically connected to the neutral line of the three-phase AC power supply; the positive pole of the second detection branch is configured to be electrically connected to the positive pole of the low-voltage power supply, and the negative pole of the second detection branch is configured to be electrically connected to the negative pole of the low-voltage power supply; one end of the first normally open contact is configured to be electrically connected to the positive pole of the low-voltage power supply; the ground end of the control unit is configured to be electrically connected to the negative pole of the low-voltage power supply; the second functional terminal is configured to be electrically connected to the positive pole of the low-voltage power supply; one end of the first normally closed contact is configured to be electrically connected to the positive pole of the low-voltage power supply; the phenotype detection circuit also includes: a third detection branch; one end of the third detection branch is configured to be electrically connected to the third functional terminal, and the other end is configured to be electrically connected to the phase line of the three-phase AC power supply; the third detection branch includes: a fourth normally open contact of the first relay and a second normally closed contact of the second relay connected in series.

[0018] In the above implementation process, the meter type detection circuit also includes a third detection branch, and one end of the third detection branch is electrically connected to the third functional terminal, and the other end is electrically connected to the phase line of the three-phase AC power supply. Since the third detection branch includes the fourth normally open contact of the first relay and the second normally closed contact of the second relay connected in series, when the first relay is actuated (that is, the electric energy meter to be detected is an electric energy meter with an external active switch) and the second relay is not actuated, the fourth normally open contact is closed, and the phase voltage of the three-phase AC power supply will be transmitted to the third functional terminal (that is, the feedback signal terminal) based on the second normally closed contact and the closed fourth normally open contact. When the function of the third functional terminal can be normally realized, the electric energy meter will detect the signal change of the third functional terminal inside, and store the signal change in the parameter "electricity meter operation status word". By reading the "electricity meter operation status word" of the electric energy meter, it is possible to analyze whether the third functional terminal of the electric energy meter to be detected is working normally. The working state detection of the third functional terminal is realized.

[0019] In addition, in the case where the electric energy meter to be detected is an electric energy meter with an external passive switch, it is not necessary to detect the working state of the third functional terminal by providing the third functional terminal with the phase voltage of the three-phase AC power supply. In the meter type detection circuit provided in the present application, when the second relay is actuated, the second normally closed contact is disconnected. At this time, in the process of "detecting the connection relationship of the first functional terminal, the second functional terminal, and the third functional terminal through the node type", even if the first relay is actuated and the fourth normally open contact is closed, the phase voltage of the three-phase AC power supply cannot be provided to the third functional terminal; the functional interlocking between "detecting the connection relationship of the first functional terminal, the second functional terminal, and the third functional terminal of the electric energy meter with an external passive switch" and "detecting the working state of the third functional terminal of the electric energy meter with an external active switch" is realized, which provides a guarantee for the orderly execution of multiple detection functions.

[0020] Optionally, in an embodiment of the present application, the phenotype of the electric energy meter to be detected includes: an electric energy meter with an external active switch and an electric energy meter with an external passive switch; the control unit is specifically configured to: when the first input signal includes a high-level signal, determine that the electric energy meter to be detected is an electric energy meter with an external active switch; when the first input signal does not include a high-level signal, determine that the electric energy meter to be detected is an electric energy meter with an external passive switch.

[0021] In the above implementation process, based on whether the first input signal includes a high-level signal, the phenotype of the electric energy meter to be detected can be quickly and accurately determined, thereby improving the detection efficiency and operational safety factor of the electric energy meter, and solving the technical problems of slow detection efficiency and low operational safety factor in the existing method for realizing terminal function detection of different phenotypes due to the difficulty in distinguishing the phenotype of the electric energy meter.

[0022] Optionally, in an embodiment of the present application, the control unit is further configured to: when the electric energy meter to be detected is an electric energy meter with an external passive switch, and the second input signal is a low-level signal and the third input signal is a high-level signal, determine that the connection relationship between the first functional terminal, the second functional terminal and the third functional terminal is normal; and, when the electric energy meter to be detected is an electric energy meter with an external active switch, determine whether the output waveform of the first functional terminal is stable according to the first input signal.

[0023] In the above implementation process, when the electric energy meter to be detected is an electric energy meter with an external passive switch, based on the level state of the second input signal and the third input signal, it can be accurately determined whether the connection relationship between the first functional terminal, the second functional terminal and the third functional terminal is normal. When the electric energy meter to be detected is an electric energy meter with an external active switch, it can be accurately determined whether the output waveform of the first functional terminal is stable according to the first input signal. The connection relationship and working state detection of multiple functional terminals are realized.

[0024] Optionally, in an embodiment of the present application, the meter communication port of the electric energy meter to be detected is configured to be electrically connected to the first communication port of the control unit; the control unit is further configured to: when the electric energy meter to be detected is an electric energy meter with an external active switch, send a meter operation status reading instruction to the meter communication port based on the first communication port; receive the meter operation status information returned by the electric energy meter to be detected based on the meter communication port; determine the relay feedback signal of the electric energy meter to be detected based on the meter operation status information; and determine whether the feedback status of the third functional terminal is correct based on the relay feedback signal.

[0025] In the above implementation process, when the first relay is in action (i.e., the electric energy meter to be detected is an electric energy meter with an external active switch) and the second relay is not in action, the fourth normally open contact is closed, and the phase voltage of the three-phase AC power supply will be transmitted to the third functional terminal (i.e., the feedback signal terminal) based on the second normally closed contact and the closed fourth normally open contact. When the function of the third functional terminal can be normally realized, the electric energy meter will detect the signal change of the third functional terminal and store the signal change in the parameter "electricity meter operation status word". Send the electric energy meter operation status reading instruction to the electric energy meter communication port through the first communication port; receive the electric energy meter operation status information (i.e., the "electricity meter operation status word" parameter) returned by the electric energy meter to be detected based on the electric energy meter communication port; then the relay feedback signal of the electric energy meter to be detected can be parsed according to the electric energy meter operation status information, and based on the relay feedback signal, it can be determined whether the feedback status of the third functional terminal is correct (i.e., whether the third functional terminal is working normally), thereby realizing the working status detection of the third functional terminal.

[0026] Optionally, in an embodiment of the present application, the meter detection circuit also includes: a third relay and three fifth parallel normally open contacts of the third relay; one end of the third relay is configured to be electrically connected to the positive pole of the low-voltage power supply, and the other end is electrically connected to the second output port of the control unit; the control unit is also configured to control the action of the third relay based on the second output signal of the second output port; one end of the three fifth parallel normally open contacts is respectively configured to be electrically connected to different phase lines of the three-phase AC power supply, and the other end is configured to be electrically connected to the corresponding power port of the electric energy meter to be detected.

[0027] In the above implementation process, since the three fifth parallel normally open contacts are respectively arranged between different phase lines of the three-phase AC power supply and the corresponding power ports of the electric energy meter to be detected, only when the control unit controls the third relay to operate based on the second output signal, will the working power supply be provided to the electric energy meter to be detected based on the three-phase AC power supply, thereby improving the safety of the electric energy meter type detection.

[0028] Optionally, in an embodiment of the present application, the photosensor includes a phototransistor; the second detection branch also includes: an amplifying transistor and a second resistor; the emitter of the phototransistor is electrically connected to one end of the second resistor and the base of the amplifying transistor, and the collector of the phototransistor is configured to be electrically connected to the positive electrode of the low-voltage power supply; the other end of the second resistor is electrically connected to the emitter of the amplifying transistor and one end of the first relay; the other end of the first relay is configured to be electrically connected to the negative electrode of the low-voltage power supply; the collector of the amplifying transistor is configured to be electrically connected to the positive electrode of the low-voltage power supply.

[0029] In the above implementation process, by amplifying the "induced current generated by the phototransistor when the light-emitting diode emits light" based on the amplifying transistor, it is possible to avoid the situation where the first relay does not operate when the phototransistor generates current but the current is small, thereby causing an erroneous phenotypic detection result, thereby improving the operation reliability of the first relay.

[0030] Optionally, in an embodiment of the present application, the phenotype detection circuit also includes: a detection sensor, which is arranged in a detection area for placing the electric energy meter to be detected; the detection sensor is configured to detect whether the electric energy meter to be detected is placed in the detection area; one end of the detection sensor is configured to be electrically connected to the positive pole of the detection power supply, and the other end is electrically connected to the fourth input port of the control unit; the control unit is also configured to determine whether the electric energy meter to be detected is placed in the detection area according to a fourth input signal of the fourth input port.

[0031] In the above implementation process, the detection sensor can be used to detect whether the electric energy meter to be detected is placed in the detection area; and the fourth input signal is obtained through the fourth input interface of the control unit, and it is determined whether the electric energy meter to be detected is placed in the detection area according to the fourth input signal, thereby improving the degree of automation of the electric energy meter type detection.

[0032] In a second aspect, an embodiment of the present application provides a phenotype detection method for an electric energy meter, which is applied to a control unit in a phenotype detection circuit as described in any one of the first aspects above; the phenotype detection method includes: determining the phenotype of the electric energy meter to be detected based on a first input signal of a first input port of the control unit.

[0033] The beneficial effects of the present application are as follows: since the positive electrode of the first detection branch is electrically connected to the first functional terminal, and the negative electrode is electrically connected to the negative electrode of the detection power supply; the positive electrode of the second detection branch is electrically connected to the positive electrode of the detection power supply, and the negative electrode is electrically connected to the negative electrode of the detection power supply; and the first detection branch includes a first resistor and a light-emitting diode connected in series, and the second detection branch includes a photosensitive sensor and a first relay connected in series. When there is power output at the first functional terminal, the light-emitting diode will be driven to emit light, and the photosensitive sensor can respond to the light emitted by the light-emitting diode to drive the first relay to operate; and the first normally open contact of the first relay is electrically connected to the positive electrode of the detection power supply and the first input port of the control unit respectively; when the first relay operates, the first normally open contact is closed and transmits a signal to the first input port; the control unit can determine the type of the electric energy meter to be detected based on the received first input signal. The phenotype detection circuit based on the above-mentioned electric energy meter can quickly realize the phenotype detection of the electric energy meter, thereby improving the detection efficiency and operational safety factor of the electric energy meter, and solving the technical problems of slow detection efficiency and low operational safety factor in the existing method for realizing terminal function detection of different phenotypes due to the difficulty in distinguishing the phenotype of the electric energy meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a meter type detection circuit of an electric energy meter provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the structure of another type detection circuit of an electric energy meter provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of a phenotypic detection process provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of a meter type detection circuit 10 of an electric energy meter provided in an embodiment of the present application. The meter type detection circuit 10 of the electric energy meter comprises: a first detection branch, a second detection branch and a control unit;

[0042] The first detection branch comprises: a first resistor R1 and a light emitting diode D1 connected in series; the positive electrode of the first detection branch is configured to be electrically connected to the first functional terminal A1 of the electric energy meter to be detected, and the negative electrode of the first detection branch is configured to be electrically connected to the negative electrode of the detection power supply; wherein the first functional terminal A1 refers to the control signal output terminal or the trip normally open terminal in the external switch function port of the electric energy meter to be detected;

[0043] The second detection branch includes: a photosensor T1 and a first relay KM1 connected in series; the positive electrode of the second detection branch is configured to be electrically connected to the positive electrode of the detection power supply, and the negative electrode of the second detection branch is configured to be electrically connected to the negative electrode of the detection power supply;

[0044] One end of the first normally open contact KM1-S1 of the first relay KM1 is configured to be electrically connected to the positive electrode of the detection power supply, the other end of the first normally open contact KM1-S1 is electrically connected to the first input port X1 of the control unit, and the ground terminal GND of the control unit is configured to be electrically connected to the negative electrode of the detection power supply;

[0045] The control unit is configured to determine the type of the electric energy meter to be detected according to the first input signal of the first input port X1.

[0046] The control unit can be implemented by a microcontroller unit (MCU), a single chip microcomputer or a programmable logic controller (PLC). The first resistor R1 can be implemented by a fixed resistor or a variable resistor, and the resistance of R1 can be 10kΩ, 50kΩ, 100kΩ, 120kΩ or other reasonable values. The positive and negative poles of the first detection branch are determined based on the positive and negative poles of the light-emitting diode D1. Figure 1 For example, the end of the LED D1 close to R1 is the positive pole, and the end away from R1 is the negative pole; accordingly, the end of the first detection branch close to the positive pole of the LED D1 (i.e., the positive pole of the first detection branch) is electrically connected to the first functional terminal A1, and the end close to the negative pole of the LED D1 (i.e., the negative pole of the first detection branch) is electrically connected to the negative pole of the detection power supply. The detection power supply can be implemented by a low-voltage DC power supply (e.g., a 12V, 24V, or 48V DC power supply), and the detection power supply can also include a low-voltage DC power supply and a high-voltage three-phase AC power supply at the same time. The specific implementation method of the detection power supply can be adjusted according to the actual application situation.

[0047] Among them, the State Grid Corporation of China's "Q / GDW 10356-2020 Three-phase Smart Energy Meter Type Specification" stipulates the definition of the signal terminal output interface of the energy meter's external switch; the functional definitions of terminals 14, 15, and 16 in different meter types (electricity meters with external passive switches and external active switches) are different, but their appearance, size, and interface position are consistent. The first functional terminal A1 refers to the control signal output terminal or trip normally open terminal in the external switch function port of the energy meter to be tested; that is, terminal 14 described in the current technical specifications of the energy meter.

[0048] Among them, the photosensitive sensor T1 can be implemented by a phototransistor, a photoresistor, etc. The first relay KM1 can be implemented by an electromagnetic relay or a reed relay, etc. Since the conduction current of the phototransistor is small, the first relay KM1 can be implemented by a micro-power relay or a weak power relay. In this way, even a small conduction current can trigger the action of the first relay KM1, thereby improving the action reliability of the first relay KM1. The positive and negative poles of the second detection branch are determined based on the positive and negative poles of the photosensitive sensor T1.

[0049] Among them, the type of the electric energy meter to be detected can include an electric energy meter with an external active switch and an electric energy meter with an external passive switch. In the case that the electric energy meter to be detected is an electric energy meter with an external active switch, the first functional terminal A1 will have power output, thereby driving the light-emitting diode D1 to emit light, and the photosensitive sensor T1 can respond to the light emitted by the light-emitting diode D1 to drive the first relay KM1 to operate; and the first normally open contact KM1-S1 of the first relay KM1 is electrically connected to the positive pole of the detection power supply and the first input port X1 of the control unit respectively; when the first relay KM1 operates, the first normally open contact KM1-S1 is closed and transmits a signal to the first input port X1; the control unit can determine the type of the electric energy meter to be detected based on the first input signal received.

[0050] It can be seen that the phenotype detection circuit of the electric energy meter provided in the embodiment of the present application can quickly realize the phenotype detection of the electric energy meter, thereby improving the detection efficiency and operational safety factor of the electric energy meter, and solving the technical problems of slow detection efficiency and low operational safety factor in the existing method for realizing terminal function detection of different phenotypes due to the difficulty in distinguishing the phenotype of the electric energy meter.

[0051] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of another type detection circuit 20 of an electric energy meter provided in an embodiment of the present application. It should be noted that: Figure 2 The connection relationship between A1, A2 and A3 in the dotted box corresponds to the internal connection relationship between A1, A2 and A3 of the electric energy meter with the passive switch external.

[0052] In some optional embodiments, the meter type detection circuit 20 also includes: a first normally closed contact KM1-S2 of the first relay KM1, a second relay KM2, and a second normally open contact KM2-S1 and a third normally open contact KM2-S2 of the second relay; the second functional terminal A2 of the electric energy meter to be detected is configured to be electrically connected to the positive pole of the detection power supply; the first functional terminal A1 is electrically connected to one end of the second normally open contact KM2-S1, and the other end of the second normally open contact KM2-S1 is electrically connected to the second input port X2 of the control unit; the control unit is also configured to determine the first node type between the first functional terminal A1 and the second functional terminal A2 according to the second input signal of the second input port X2; wherein the second functional terminal A2 refers to an unoccupied terminal or a trip common terminal in the external switch function port; the electric energy meter to be detected The third functional terminal A3 of the electric energy meter is electrically connected to one end of the third normally open contact KM2-S2, and the other end of the third normally open contact KM2-S2 is electrically connected to the third input port X3 of the control unit; the control unit is also configured to determine the second node type between the third functional terminal A3 and the second functional terminal A2 according to the third input signal of the third input port X3; wherein the third functional terminal A3 refers to the feedback signal terminal or the tripping normally closed terminal in the external switch function port; one end of the first normally closed contact KM1-S2 is configured to be electrically connected to the positive pole of the detection power supply, and the other end is electrically connected to one end of the second relay KM2; the other end of the second relay KM2 is electrically connected to the first output port Y1 of the control unit; the control unit is also configured to control the action of the second relay KM2 based on the first output signal of the first output port Y1.

[0053] Among them, the second relay KM2 can be implemented by an electromagnetic relay or a reed relay. The implementation method of the second relay KM2 can be the same as or different from the implementation method of the first relay KM1, and this application does not make specific restrictions on this. The second functional terminal A2 refers to the vacant terminal or the trip common terminal in the external switch function port; that is, terminal 15 described in the current technical specifications of the electric energy meter. The third functional terminal A3 refers to the feedback signal terminal or the trip normally closed terminal in the external switch function port; that is, terminal 16 described in the current technical specifications of the electric energy meter. Specifically, in the case where the electric energy meter to be detected is an electric energy meter with an external active switch, terminal 14 is a control signal output terminal, terminal 15 is a vacant terminal, and terminal 16 is a feedback signal terminal; in the case where the electric energy meter to be detected is an electric energy meter with an external active switch, terminal 14 is a trip normally open terminal, terminal 15 is a trip common terminal, and terminal 16 is a trip normally closed terminal.

[0054] Among them, the first output signal can be a low-level signal, and the control unit can specifically output a low-level signal based on the first output port Y1. At this time, the second relay KM2 will be activated; the second normally open contact KM2-S1 and the third normally open contact KM2-S2 are closed; the control unit will obtain the terminal signals of the first functional terminal A1 and the third functional terminal A3 based on the second input port X2 and the third input port X3 respectively, and detect the "first node type between the first functional terminal A1 and the second functional terminal A2" and the "second node type between the third functional terminal A3 and the second functional terminal A2" based on the obtained terminal signals (the second input signal and the third input signal).

[0055] In some optional embodiments, the detection power supply includes: a three-phase AC power supply and a low-voltage power supply; the negative pole of the first detection branch is configured to be electrically connected to the neutral line (A phase line, B phase line or C phase line) of the three-phase AC power supply; the positive pole of the second detection branch is configured to be electrically connected to the positive pole of the low-voltage power supply, and the negative pole of the second detection branch is configured to be electrically connected to the negative pole of the low-voltage power supply; one end of the first normally open contact KM1-S1 is configured to be electrically connected to the positive pole of the low-voltage power supply; the ground terminal of the control unit is configured to be electrically connected to the negative pole of the low-voltage power supply. pole; the second functional terminal A2 is configured to be electrically connected to the positive pole of the low-voltage power supply; one end of the first normally closed contact KM1-S2 is configured to be electrically connected to the positive pole of the low-voltage power supply; the phenotype detection circuit also includes: a third detection branch; one end of the third detection branch is configured to be electrically connected to the third functional terminal A3, and the other end is configured to be electrically connected to the phase line of the three-phase AC power supply; the third detection branch includes: the fourth normally open contact KM1-S3 of the first relay KM1 and the second normally closed contact KM2-S3 of the second relay KM2 connected in series.

[0056] The three-phase AC power supply may be an AC power supply with a phase voltage of 220V. The low-voltage power supply may be a low-voltage DC power supply of 12V, 24V or 48V. Specifically, Figure 2The figure shows a case where a working power supply (A, B and C phase working power supply) is provided to the electric energy meter to be detected based on a three-phase AC power supply (Ain, Bin and Cin), and the negative pole of the first detection branch is electrically connected to the A phase line of the three-phase AC power supply. Since the electric energy meter to be detected is an electric energy meter with an external passive switch, it is not necessary to provide the third functional terminal A3 with a phase voltage of the three-phase AC power supply to realize the working state detection of the third functional terminal A3. In the meter type detection circuit provided in the present application, the third detection branch includes: the fourth normally open contact KM1-S3 of the first relay KM1 and the second normally closed contact KM2-S3 of the second relay KM2 connected in series. When the second relay KM2 is actuated, the second normally closed contact KM2-S3 is disconnected. At this time, in the process of "detecting the connection relationship of the first functional terminal A1, the second functional terminal A2, and the third functional terminal A3 through the node type", even if the first relay KM1 is actuated and the fourth normally open contact KM1-S3 is closed, the phase voltage of the three-phase AC power supply cannot be provided to the third functional terminal A3; the functional interlocking between "detecting the connection relationship of the first functional terminal A1, the second functional terminal A2, and the third functional terminal A3 of the electric energy meter with an external passive switch" and "detecting the working state of the third functional terminal A3 of the electric energy meter with an external active switch" is realized, thereby providing a guarantee for the orderly execution of multiple detection functions.

[0057] In some optional embodiments, the phenotype of the electric energy meter to be detected includes: an electric energy meter with an external active switch and an electric energy meter with an external passive switch; the control unit is specifically configured to: when the first input signal includes a high-level signal, determine that the electric energy meter to be detected is an electric energy meter with an external active switch; when the first input signal does not include a high-level signal, determine that the electric energy meter to be detected is an electric energy meter with an external passive switch.

[0058] Among them, based on whether the first input signal includes a high-level signal, the phenotype of the electric energy meter to be detected can be quickly and accurately determined, thereby improving the detection efficiency and operational safety factor of the electric energy meter, and solving the technical problems of slow detection efficiency and low operational safety factor in the existing method for realizing terminal function detection of different phenotypes due to the difficulty in distinguishing the phenotype of the electric energy meter.

[0059] In some optional embodiments, the control unit is further configured to: when the electric energy meter to be detected is an electric energy meter with an external passive switch, and the second input signal is a low-level signal and the third input signal is a high-level signal, determine that the connection relationship between the first functional terminal A1, the second functional terminal A2 and the third functional terminal A3 is normal; and, when the electric energy meter to be detected is an electric energy meter with an external active switch, determine whether the output waveform of the first functional terminal A1 is stable according to the first input signal.

[0060] Among them, when the second input signal is a low level signal and the third input signal is a high level signal, it can be determined that "the first function terminal A1 and the second function terminal A2 are a normally open node, and the third function terminal A3 and the second function terminal A2 are a normally closed node", at this time, the connection relationship between the first function terminal A1, the second function terminal A2, and the third function terminal A3 is correct; and when the second input signal is a high level signal and the third input signal is a low level signal, it is determined that "the first function terminal A1 and the second function terminal A2 are a normally closed node, and the third function terminal A3 and the second function terminal A2 are a normally open node", at this time, the connection relationship between the first function terminal A1, the second function terminal A2, and the third function terminal A3 is wrong. The control unit obtains the first input signal through the first input port X1, and can determine whether the output waveform of the first function terminal A1 is stable according to whether the first input signal is continuous. Specifically, if the first input signal is a continuous high-level signal, it can be determined that the output waveform of the first functional terminal A1 is stable, and the electric energy meter to be tested does not have faults such as relay attraction jitter, unreliable driving, etc.; if the first input signal includes alternating high and low level signals, or includes irregular level signals, it can be determined that the output waveform of the first functional terminal A1 is not stable, and the electric energy meter to be tested has faults such as relay attraction jitter, unreliable driving, etc.

[0061] In some optional embodiments, the meter communication port of the electric energy meter to be detected is configured to be electrically connected to the first communication port of the control unit; the control unit is also configured to: when the electric energy meter to be detected is an electric energy meter with an external active switch, send a meter operation status reading instruction to the meter communication port based on the first communication port; receive the meter operation status information returned by the electric energy meter to be detected based on the meter communication port; determine the relay feedback signal of the electric energy meter to be detected according to the meter operation status information; and determine whether the feedback status of the third functional terminal is correct according to the relay feedback signal.

[0062] Among them, the electric energy meter can usually transmit signals through the 485 communication interface, and the communication port of the electric energy meter can be the 485 communication interface of the electric energy meter to be detected, specifically, the terminals 25 and 26 described in the current technical specifications of the electric energy meter. When the electric energy meter to be detected is an electric energy meter with an external active switch, the first relay KM1 is actuated, and the second relay KM2 is not actuated, the fourth normally open contact KM1-S3 is closed, and the phase voltage of the three-phase AC power supply will be transmitted to the third functional terminal A3 based on the second normally closed contact KM2-S3 and the closed fourth normally open contact KM1-S3. When the function of the third functional terminal A3 can be realized normally, the internal part of the electric energy meter to be detected will detect the signal change of the third functional terminal A3, and store the signal change in the parameter "electricity meter operation status word". The control unit can send a meter operation status reading instruction to the meter communication port through the first communication port; receive the meter operation status information (i.e., the "meter operation status word" parameter) returned by the electric energy meter to be detected based on the meter communication port; and can parse the relay feedback signal of the electric energy meter to be detected according to the meter operation status information, and based on the relay feedback signal, it can be determined whether the feedback status of the third functional terminal A3 is correct (i.e., whether the third functional terminal is working normally), thereby realizing the working status detection of the third functional terminal.

[0063] In some optional embodiments, the meter detection circuit also includes: a third relay KM3 and three fifth parallel normally open contacts KM3-S1 of the third relay KM3; one end of the third relay KM3 is configured to be electrically connected to the positive pole of the low-voltage power supply, and the other end is electrically connected to the second output port Y2 of the control unit; the control unit is also configured to control the action of the third relay KM3 based on the second output signal of the second output port Y2; one end of the three fifth parallel normally open contacts KM3-S1 is respectively configured to be electrically connected to different phase lines of the three-phase AC power supply, and the other end is configured to be electrically connected to the corresponding power port of the electric energy meter to be detected.

[0064] Among them, the third relay KM3 can be implemented by an electromagnetic relay or a reed relay. The implementation method of the third relay KM3 can be the same as or different from the implementation method of the first relay KM1 or the second relay KM2, and the present application does not make specific restrictions on this. When the third relay KM3 is actuated, the three fifth parallel normally open contacts KM3-S1 will be closed together to realize the power supply of the three-phase AC power supply to the electric energy meter to be detected. The three fifth parallel normally open contacts KM3-S1 are respectively arranged between different phase lines of the three-phase AC power supply and the corresponding power supply ports of the electric energy meter to be detected. Only when the control unit controls the action of the third relay KM3 based on the second output signal, the working power supply will be provided to the electric energy meter to be detected based on the three-phase AC power supply, thereby improving the safety of the electric energy meter type detection.

[0065] In some optional embodiments, the photosensor T1 includes a phototransistor; the second detection branch also includes: an amplifying transistor T2 and a second resistor R2; the emitter of the phototransistor is electrically connected to one end of the second resistor R2 and the base of the amplifying transistor T2, and the collector of the phototransistor is configured to be electrically connected to the positive electrode of the low-voltage power supply; the other end of the second resistor R2 is electrically connected to the emitter of the amplifying transistor T2 and one end of the first relay KM1; the other end of the first relay KM1 is configured to be electrically connected to the negative electrode of the low-voltage power supply; the collector of the amplifying transistor T2 is configured to be electrically connected to the positive electrode of the low-voltage power supply.

[0066] Among them, the phototransistor can be PT333, PT334-6C or other models, and the specific model of the phototransistor can be selected according to the actual application. The amplification factor of the amplifier transistor T2 can be 50, 100, 250 or other reasonable multiples, and the second resistor R2 can be realized by a fixed resistor or a variable resistor, etc. The resistance value of R2 can be 3kΩ, 5kΩ, 10kΩ, 12kΩ or other reasonable values. Based on the amplifier transistor T2, the "induced current generated by the phototransistor when the light-emitting diode D1 emits light" is amplified, which can avoid the situation where the first relay KM1 does not operate when the phototransistor generates current but the current is small, thereby causing the phenotype detection result to be wrong; improve the operation reliability of the first relay KM1.

[0067] In some optional embodiments, the resistance value of the first resistor R1 is greater than or equal to 10 kΩ and less than or equal to 120 kΩ; the resistance value of the second resistor R2 is greater than or equal to 3 kΩ and less than or equal to 12 kΩ.

[0068] In some optional embodiments, the phenotype detection circuit also includes: a detection sensor, which is arranged in a detection area for placing the electric energy meter to be detected; the detection sensor is configured to detect whether the electric energy meter to be detected is placed in the detection area; one end of the detection sensor is configured to be electrically connected to the positive pole of the detection power supply, and the other end is electrically connected to the fourth input port X4 of the control unit; the control unit is also configured to determine whether the electric energy meter to be detected is placed in the detection area according to a fourth input signal of the fourth input port X4.

[0069] The detection sensor may be implemented by a position sensor (eg, a travel switch) or a pressure sensor. Figure 2The case where the detection sensor is implemented by the travel switch S4 is shown in the figure. The detection sensor can detect whether the detection area is placed with the electric energy meter to be detected; and the fourth input signal is obtained through the fourth input interface X4 of the control unit, and it is determined whether the detection area is placed with the electric energy meter to be detected according to the fourth input signal, thereby improving the automation of the electric energy meter type detection.

[0070] Please refer to Figure 3 , Figure 3 A schematic diagram of a phenotypic detection process provided in an embodiment of the present application. Figure 3 The flowchart of realizing the phenotype detection work based on the phenotype detection circuit of the above-mentioned electric energy meter is specifically shown in FIG. Figure 3For example, in the process of realizing the phenotype detection of the electric energy meter, it is possible to first detect whether the electric energy meter to be detected is placed in the detection area based on the detection sensor. In the case where the electric energy meter to be detected is placed in the detection area, the second output signal is output based on the second output port Y2 of the control unit to drive the third relay KM3 to operate. In the case of the third relay KM3 operating, the three fifth parallel normally open contacts KM3-S1 will be closed together to realize the power supply of the three-phase AC power supply to the electric energy meter to be detected. The control unit determines the phenotype of the electric energy meter to be detected according to the first input signal received by the first input port X1. In the case that the electric energy meter to be detected is an electric energy meter with an external active switch, a meter operation status reading instruction is sent to the meter communication port based on the first communication port; the meter operation status information returned by the electric energy meter to be detected based on the meter communication port is received; the relay feedback signal of the electric energy meter to be detected is determined according to the meter operation status information; according to the relay feedback signal, whether the feedback state of the third functional terminal is correct is determined; and whether the output waveform of the first functional terminal A1 is stable according to the first input signal. In the case that the electric energy meter to be detected is an electric energy meter with an external passive switch, the control unit outputs a first output signal based on the first output port Y1 to control the second relay KM2 to operate. The second normally open contact KM2-S1 and the third normally open contact KM2-S2 of the second relay KM2 are closed. The control unit obtains the current terminal signals of the first functional terminal A1 and the third functional terminal A3 based on the second input port X2 and the third input port X3, respectively, and determines the "first current node type between the first functional terminal A1 and the second functional terminal A2" and the "second current node type between the third functional terminal A3 and the second functional terminal A2" based on the obtained terminal signals (the second input signal and the third input signal). The control unit sends a control instruction to the electric energy meter to be detected to change the terminal states of the first functional terminal A1, the second functional terminal A2 and the third functional terminal A3; and obtains the terminal signals of the first functional terminal A1 and the third functional terminal A3 after the states are changed based on the second input port X2 and the third input port X3. If the terminal signals after the states of the first functional terminal A1 and the third functional terminal A3 are changed are completely opposite to the above-mentioned "current terminal signals of the first functional terminal A1 and the third functional terminal A3", it is determined that the functions of the first functional terminal A1, the second functional terminal A2 and the third functional terminal A3 of the electric energy meter to be tested are normal and the test is qualified. The control unit stops outputting the second output signal, and the third relay KM3 does not operate; the power supply to the electric energy meter to be tested is disconnected. The test data is saved and recorded by the control unit or the host computer, and the terminal states of the first functional terminal A1, the second functional terminal A2 and the third functional terminal A3 are reset. The electric energy meter to be tested is removed, and a test process is completed.

[0071] The present application also provides a phenotype detection method for an electric energy meter, the phenotype detection method being applied to a control unit in a phenotype detection circuit as described in any one of the first aspects above; the phenotype detection method comprises: determining the phenotype of the electric energy meter to be detected based on a first input signal of a first input port of the control unit.

[0072] It should be understood that the phenotype detection method of the electric energy meter corresponds to the above-mentioned phenotype detection circuit embodiment of the electric energy meter. The specific implementation method of the phenotype detection method can be found in the description above. To avoid repetition, the detailed description is appropriately omitted here.

[0073] In several embodiments provided by the embodiments of the present application, it should be understood that the disclosed device / system and method can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices and methods according to the multiple embodiments of the embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and a part of the module, program segment or code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0074] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0075] The above description is only an optional implementation manner of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the embodiments of the present application, which should be covered within the protection scope of the embodiments of the present application.

Claims

1. A meter type detection circuit for an electric energy meter, characterized in that: The phenotype detection circuit comprises: a first detection branch, a second detection branch and a control unit; The first detection branch comprises: a first resistor and a light-emitting diode connected in series; the positive electrode of the first detection branch is configured to be electrically connected to the first functional terminal of the electric energy meter to be detected, and the negative electrode of the first detection branch is configured to be electrically connected to the negative electrode of the detection power supply; wherein the first functional terminal refers to the control signal output terminal or the trip normally open terminal in the external switch function port of the electric energy meter to be detected; The second detection branch comprises: a photosensor and a first relay connected in series; the positive electrode of the second detection branch is configured to be electrically connected to the positive electrode of the detection power supply, and the negative electrode of the second detection branch is configured to be electrically connected to the negative electrode of the detection power supply; One end of the first normally open contact of the first relay is configured to be electrically connected to the positive electrode of the detection power supply, the other end of the first normally open contact is electrically connected to the first input port of the control unit, and the ground end of the control unit is configured to be electrically connected to the negative electrode of the detection power supply; The control unit is configured to determine the type of the electric energy meter to be detected according to the first input signal of the first input port.

2. The phenotype detection circuit according to claim 1, characterized in that: The phenotype detection circuit further includes: a first normally closed contact of the first relay, a second relay, and a second normally open contact and a third normally open contact of the second relay; The second functional terminal of the electric energy meter to be tested is configured to be electrically connected to the positive electrode of the detection power supply; The first function terminal is electrically connected to one end of the second normally open contact, and the other end of the second normally open contact is electrically connected to the second input port of the control unit; the control unit is further configured to determine a first node type between the first function terminal and the second function terminal according to a second input signal of the second input port; wherein the second function terminal refers to an unoccupied terminal or a trip common terminal in the external switch function port; The third function terminal of the electric energy meter to be detected is electrically connected to one end of the third normally open contact, and the other end of the third normally open contact is electrically connected to the third input port of the control unit; the control unit is further configured to determine the second node type between the third function terminal and the second function terminal according to the third input signal of the third input port; wherein the third function terminal refers to the feedback signal terminal or the trip normally closed terminal in the external switch function port; One end of the first normally closed contact is configured to be electrically connected to the positive pole of the detection power supply, and the other end is electrically connected to one end of the second relay; the other end of the second relay is electrically connected to the first output port of the control unit; the control unit is also configured to control the action of the second relay based on the first output signal of the first output port.

3. The phenotype detection circuit according to claim 2, characterized in that: in, The detection power supply includes: a three-phase AC power supply and a low-voltage power supply; The negative pole of the first detection branch is configured to be electrically connected to the neutral line of the three-phase AC power supply; the positive pole of the second detection branch is configured to be electrically connected to the positive pole of the low-voltage power supply, and the negative pole of the second detection branch is configured to be electrically connected to the negative pole of the low-voltage power supply; one end of the first normally open contact is configured to be electrically connected to the positive pole of the low-voltage power supply; the ground terminal of the control unit is configured to be electrically connected to the negative pole of the low-voltage power supply; the second functional terminal is configured to be electrically connected to the positive pole of the low-voltage power supply; one end of the first normally closed contact is configured to be electrically connected to the positive pole of the low-voltage power supply; The phenotypic detection circuit also includes: a third detection branch; one end of the third detection branch is configured to be electrically connected to the third functional terminal, and the other end is configured to be electrically connected to the phase line of the three-phase AC power supply; the third detection branch includes: a fourth normally open contact of the first relay and a second normally closed contact of the second relay connected in series.

4. The phenotype detection circuit according to claim 3, characterized in that: in, The types of electric energy meters to be tested include: electric energy meters with external active switches and electric energy meters with external passive switches; The control unit is specifically configured to: when the first input signal includes a high-level signal, determine that the electric energy meter to be detected is an electric energy meter with an external active switch; when the first input signal does not include a high-level signal, determine that the electric energy meter to be detected is an electric energy meter with an external passive switch.

5. The phenotype detection circuit according to claim 4, characterized in that: The control unit is further configured as: When the electric energy meter to be detected is an electric energy meter with an external passive switch, and the second input signal is a low-level signal and the third input signal is a high-level signal, it is determined that the connection relationship between the first function terminal, the second function terminal and the third function terminal is normal; as well as, In the case that the electric energy meter to be detected is an electric energy meter with an external active switch, it is determined whether the output waveform of the first functional terminal is stable according to the first input signal.

6. The phenotype detection circuit according to claim 5, characterized in that: in, The meter communication port of the electric energy meter to be detected is configured to be electrically connected to the first communication port of the control unit; The control unit is also configured to: when the electric energy meter to be detected is an electric energy meter with an external active switch, send an electric energy meter operation status reading instruction to the electric energy meter communication port based on the first communication port; receive the electric energy meter operation status information returned by the electric energy meter to be detected based on the electric energy meter communication port; determine the relay feedback signal of the electric energy meter to be detected according to the electric energy meter operation status information; and determine whether the feedback status of the third functional terminal is correct according to the relay feedback signal.

7. The phenotype detection circuit according to claim 3, characterized in that: The phenotype detection circuit further includes: a third relay and three fifth parallel normally open contacts of the third relay; One end of the third relay is configured to be electrically connected to the positive electrode of the low-voltage power supply, and the other end is electrically connected to the second output port of the control unit; the control unit is further configured to control the action of the third relay based on the second output signal of the second output port; One end of the three fifth parallel normally open contacts is respectively configured to be electrically connected to different phase lines of the three-phase AC power supply, and the other end is configured to be electrically connected to the corresponding power port of the electric energy meter to be detected.

8. The phenotype detection circuit according to claim 3, characterized in that: The photosensitive sensor includes a phototransistor; the second detection branch also includes: an amplifying transistor and a second resistor; The emitter of the phototransistor is electrically connected to one end of the second resistor and the base of the amplifier transistor, and the collector of the phototransistor is configured to be electrically connected to the positive electrode of the low-voltage power supply; The other end of the second resistor is electrically connected to the emitter of the amplifying transistor and one end of the first relay; the other end of the first relay is configured to be electrically connected to the negative electrode of the low-voltage power supply; The collector of the amplifying transistor is configured to be electrically connected to the positive electrode of the low-voltage power supply.

9. The phenotype detection circuit according to claim 1, characterized in that: The meter type detection circuit further includes: a detection sensor, which is arranged in a detection area for placing the electric energy meter to be detected; the detection sensor is configured to detect whether the electric energy meter to be detected is placed in the detection area; One end of the detection sensor is configured to be electrically connected to the positive pole of the detection power supply, and the other end is electrically connected to the fourth input port of the control unit; the control unit is also configured to determine whether the electric energy meter to be detected is placed in the detection area based on the fourth input signal of the fourth input port.

10. A phenotype detection method for an electric energy meter applied to a phenotype detection circuit as described in any one of claims 1 to 9, characterized in that: The phenotype detection method comprises: determining the phenotype of the electric energy meter to be detected according to a first input signal of a first input port of a control unit in the phenotype detection circuit.

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