Multifunctional three-phase electric energy meter connector

Abstract

The present application relates to a connector for quick installation of an electric energy meter, in particular to a multifunctional three-phase electric energy meter connector. A base is connected to an electric meter box. An alarm circuit board cover plate is fixed to one side of the connector, and a connector with an alarm circuit board fixed thereto is installed on the base. A connector cover plate is installed on the other side of the connector. The alarm circuit board is accommodated in a space enclosed by the alarm circuit board cover plate and the connector. An alarm circuit board switch, an indicator light, a loudspeaker and a connector piece are respectively provided on the alarm circuit board. A contact end of the alarm circuit board switch is extended from the connector. The connector has a same number of connector metal connecting heads as the number of electric energy meter wiring holes, and the connector metal connecting heads are one-to-one corresponding. The alarm circuit board is connected to the connector metal connecting heads through the connector piece. An external power supply line supplies power to the alarm circuit board through the connector metal connecting heads. In the process of quick uninterrupted power supply meter replacement, the present application can provide an audible and visual reminder to warn of safe meter replacement.

Description

Technical Field

[0001] This invention relates to connectors for quick installation of electricity meters, specifically a multifunctional three-phase electricity meter connector. Background Technology

[0002] Electricity meters are necessities in people's daily work and life. Existing electricity meters come in various specifications, with different sizes, which places higher demands on quick installation, uninterrupted meter replacement, and safe use. Summary of the Invention

[0003] To meet the needs of rapid installation, uninterrupted meter replacement, and safe use of electricity meters, this invention aims to provide a multifunctional three-phase electricity meter connector. This connector provides audible and visual alerts to ensure safe meter replacement during rapid, uninterrupted meter replacement.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] This invention includes a base, an alarm circuit board cover, an alarm circuit board, connectors, connector cover plates, and connector metal connector heads. The base is connected to a meter box. One side of the connector is fixed to the alarm circuit board cover plate, and the connector with the alarm circuit board is mounted on the base. The opposite side of the connector is also fitted with a connector cover plate. The alarm circuit board is housed within the space enclosed by the alarm circuit board cover plate and the connector. The alarm circuit board has an alarm circuit board switch, an alarm device, and connector tabs. The contact end of the alarm circuit board switch extends from the connector. The connector has connector metal connector heads that correspond one-to-one with the number of wiring holes on the meter. The alarm circuit board is connected to the connector metal connector heads via connector tabs. An external power supply line powers the alarm circuit board through the connector metal connector heads. When the meter is plugged into the connector metal connector head, it touches the contact end of the alarm circuit board switch, and the alarm device is in a closed state. When the meter is unplugged, it disengages from the contact end of the alarm circuit board switch, and the alarm device emits an alarm signal.

[0006] The base is provided with mounting holes for connecting to standard single-meter and four-meter meter boxes and non-standard single-meter and four-meter meter boxes. The base is also provided with mounting holes for connecting to connectors and mounting holes for connecting to electricity meters. The base is provided with clips for sliding connection with electricity meters.

[0007] The alarm circuit board includes an alarm circuit, which is connected in sequence between the 220V voltage and the ground line GND, including a switching circuit, a half-wave rectifier circuit, and an AC-to-DC circuit. The alarm device includes an indicator light and a voice circuit, and the AC-to-DC circuit is also connected to the voice circuit.

[0008] The switching circuit includes an alarm circuit board switch and a fuse F1 connected in sequence.

[0009] The half-wave rectifier circuit includes a rectifier diode D1 and a capacitor C1. The input terminal of the rectifier diode D1 is connected to a fuse F1, the output terminal of the rectifier diode D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to ground GND.

[0010] The AC-to-DC circuit includes an AC / DC chip U1 whose input terminal Vin is connected to the output terminal of a rectifier diode D1; and an AC / DC chip whose GND terminal is connected to ground GND via a resistor R1 and a reverse diode D2.

[0011] The output terminal Vout of AC / DC chip U1 outputs a +5V DC power supply after passing through rectifier diode D3. The +5V DC power supply passes through current-limiting resistor R3 and power inductor L1 in parallel, and is then connected between resistor R1 and reverse diode D2. The output terminal Vout of AC / DC chip U1 is connected between resistor R1 and reverse diode D2 through capacitor C2. A wire is led out from resistor R1 and reverse diode D2, passes through an indicator light, and is then connected to ground GND. The +5V DC power supply is also grounded through resistor R2 and capacitor C3. The +5V DC power supply is also connected to the voice circuit.

[0012] The voice circuit includes a voice chip U2 and a speaker. The two pins of the speaker are connected to the PWM1 and PWM2 pins of the voice chip U2, respectively. The VDD pin of the voice chip U2 is connected to a +5V DC power supply, and the GND pin is grounded. A filter capacitor C4 is connected between the VDD pin and the GND pin of the voice chip U2.

[0013] One side of the connector is provided with an alarm circuit board switch clearance groove and a connector metal connector mounting hole. The contact end of the alarm circuit board switch extends out from the alarm circuit board switch clearance groove. The other side of the connector is provided with a speaker hole corresponding to the speaker in the alarm device and a power inlet / outlet wire through hole. The top plate of the connector is provided with a connector mounting through hole for connecting to the base, a connector cover plate mounting bottom hole for connecting to the connector cover plate, an indicator light hole corresponding to the indicator light in the alarm device, and a power inlet / outlet wire clamping screw through hole for fastening the external power cord to the connector metal connector.

[0014] The connector has seven metal connectors: one neutral wire connector, three live wire inlet connectors, and three live wire outlet connectors. Each neutral wire connector has a connector hole A inside the power inlet / outlet clamping screw hole, and each live wire inlet connector has a connector hole B inside the power inlet / outlet clamping screw hole. The alarm circuit board has connectors A and B, which are respectively inserted into connector holes A and B.

[0015] One side of the connector metal connector is inserted into the wiring hole of the energy meter, and the other side has a bottom hole for power inlet and outlet lines. The top of the connector metal connector has a bottom hole for power inlet and outlet line clamping screws for fastening the external power cord to the connector metal connector.

[0016] The advantages and positive effects of this invention are as follows:

[0017] 1. The invention features a newly designed base that connects to the meter box more quickly, conveniently, and with greater durability.

[0018] 2. The alarm circuit board of the present invention can achieve accurate sound and light reminders and warnings by contacting the switch of the alarm circuit board when installing or removing the electricity meter, thus ensuring safe operation.

[0019] 3. This invention enables quick and accurate assembly and disassembly of the energy meter through the metal connector and the clip on the base.

[0020] 4. The alarm circuit board of the present invention is used to provide effective prompts and warnings when the electricity meter is moved, causing the terminals to be exposed on the surface and creating a safety hazard. It can realize voice alarms in Mandarin, Uyghur, and local dialects.

[0021] 5. When the meter box is installed on the normally closed limit switch SW1, pressing the normally closed limit switch SW1 will disconnect the circuit. When the meter box is moved, the normally closed limit switch SW1 will return to the normally closed state, the circuit will be connected, the indicator light will light up, and a voice broadcast will remind people in the vicinity of the safety hazard to avoid unsafe use of electricity. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a front view of the structure of the base of the present invention;

[0025] Figure 4 This is a top view of the alarm circuit board cover of the present invention;

[0026] Figure 5This is a schematic diagram of the alarm circuit board of the present invention;

[0027] Figure 6A This is a front view of the connector structure of the present invention;

[0028] Figure 6B This is a top view of the connector structure of the present invention;

[0029] Figure 6C This is a rear view of the connector structure of the present invention;

[0030] Figure 7A This is a front view of the structure of the metal connector of the present invention;

[0031] Figure 7B This is a top view of the structure of the metal connector of the present invention;

[0032] Figure 8 This is a top view of the connector cover plate of the present invention;

[0033] Figure 9 This is a circuit diagram of the alarm circuit board of the present invention;

[0034] Figure 10 This is a schematic diagram showing the circuit connection relationship of the alarm circuit board of the present invention;

[0035] Wherein: 1 is the base, 2 is the alarm circuit board cover, 3 is the alarm circuit board, 4 is the connector, 5 is the connector cover, 6 is the connector metal connector head, 7 is the clip, 8 is the base mounting hole A, 9 is the base mounting hole B, 10 is the base mounting hole C, 11 is the energy meter mounting hole A, 12 is the energy meter mounting hole B, 13 is the base mounting hole D, 14 is the base mounting hole E, 15 is the base mounting hole F, 16 is the connector mounting hole A, 17 is the connector mounting hole B, 19 is the speaker hole, 20 is the connector mounting hole A, 21 is the connector mounting hole B, 22 is the connector cover plate mounting hole A, 23 is the connector... Plug cover mounting hole B, 24 is indicator light hole, 25 is alarm circuit board switch clearance slot, 26 is alarm circuit board switch, 27 is indicator light, 28 is speaker, 29 is connector A, 30 is connector B, 31 is connector cover mounting through hole A, 32 is connector cover mounting through hole B, 33 is connector hole A, 34 is connector hole B, 35 is switch circuit, 36 is half-wave rectifier circuit, 37 is AC to DC circuit, 38 is voice circuit, a is connector metal connector mounting hole, b is power inlet / outlet wire clamping screw through hole, c is power inlet / outlet wire through hole, d is power inlet / outlet wire bottom hole, e is power inlet / outlet wire clamping screw bottom hole. Detailed Implementation

[0036] The invention will now be described in further detail with reference to the accompanying drawings.

[0037] like Figures 1-8 As shown, the present invention includes a base 1, an alarm circuit board cover 2, an alarm circuit board 3, a connector 4, a connector cover 5, and a connector metal connector head 6. The base 1 is connected to the meter box. The alarm circuit board cover 2 is fixed to one side of the connector 4, and the connector 4 with the alarm circuit board 2 fixed to it is mounted on the base 1. The connector cover 5 is installed on the opposite side of the connector 4. The alarm circuit board 3 is housed in the space enclosed by the alarm circuit board cover 2 and the connector 4. The alarm circuit board 3 is provided with an alarm circuit board switch 26, an alarm device, and a connector. The alarm device includes an indicator light 27 and a voice circuit 38. The voice circuit 38 includes a voice chip U2 and a speaker 28. The contact end of the alarm circuit board switch 26 extends from the connector 4. The connector 4 is equipped with connector metal connector heads 6, which are the same number as the wiring holes of the electricity meter and correspond one-to-one. The alarm circuit board 3 is connected to the connector metal connector head 6 through the connector piece. An external power supply line supplies power to the alarm circuit board 3 through the connector metal connector head 6.

[0038] In this embodiment, the base 1 has mounting holes for connecting to standard single-meter and four-meter meter boxes, as well as non-standard single-meter and four-meter meter boxes. The base 1 also has mounting holes for connecting to connectors 4 and for connecting to the electricity meter. The base 1 has a locking head 7 for sliding connection with the electricity meter. In this embodiment, the base 1 has mounting holes A8 and F15 arranged vertically in the middle, which can be used to connect to standard single-meter and four-meter meter boxes using screws. The four corners of the base 1 have mounting holes B9, C10, D13, and E14, which can be used to connect to non-standard single-meter and four-meter meter boxes using screws. Card head 7 is located below the base mounting hole A8; on both sides below the base mounting hole F15, connector mounting holes A16 and B17 are provided; below the base mounting hole D13, the electricity meter mounting hole A11 is provided, and below the base mounting hole E12, the electricity meter mounting hole B12 is provided.

[0039] In this embodiment, the alarm circuit board cover 2 has two through holes, which correspond to the connector mounting bottom hole A16 and the connector mounting bottom hole B17, respectively; the alarm circuit board cover 2 and the bottom of the connector 4 are ultrasonically heat-fused to achieve the encapsulation and shielding of the alarm circuit board 3.

[0040] In this embodiment, there are seven metal connectors 6, namely one neutral wire connector, three live wire inlet connectors, and three live wire outlet connectors. Each metal connector 6 has one side that plugs into the wiring hole of the electricity meter, and the other side has a power inlet / outlet wire bottom hole d. The top of the metal connector 6 has a power inlet / outlet wire clamping screw bottom hole e for fastening the external power cord to the metal connector 6. The top of each of the three live wire inlet connectors and the three live wire outlet connectors has two power inlet / outlet wire clamping screw bottom holes e, and the other side of each of the three live wire inlet connectors and the three live wire outlet connectors has one power inlet / outlet wire bottom hole d. The top of the component connector has four power inlet / outlet wire clamping screw bottom holes e, and the other side of the component connector has two power inlet / outlet wire bottom holes d.

[0041] On one side of the connector 4 in this embodiment, there is an alarm circuit board switch recess 25 and a connector metal connector mounting hole a. There are two connector metal connector mounting holes a corresponding to the neutral wire terminal, and one connector metal connector mounting hole a corresponding to each of the three live wire inlet terminals and the three live wire outlet terminals. The contact end of the alarm circuit board switch 26 extends out from the alarm circuit board switch recess 25. On the other side of the connector 4, there is a speaker hole 19 corresponding to the speaker 28 and power inlet / outlet through holes that are the same number as the connector metal connector mounting holes a and correspond one-to-one. c. The top plate of connector 4 is provided with connector mounting holes for connecting to base 1, connector cover mounting holes for connecting to connector cover 5, indicator light holes 24 corresponding to indicator light 27, and power input / output wire clamping screw holes b for fastening the external power cord to the connector metal connector 6. Two power input / output wire clamping screw holes b are grouped together. There are two groups of four power input / output wire clamping screw holes b corresponding to the neutral wire connector. Each of the three live wire input connectors and three live wire output connectors has one group of power input / output wire clamping screw holes b. In this embodiment, the seven connector metal connectors 6 are inserted through their corresponding connector metal connector mounting holes a, and then connected to the power input / output wire clamping screw bottom holes e on the connector metal connector 6 using wire clamping screws through the power input / output wire clamping screw holes b, thus connecting the external power cord to the connector metal connector 6. The alarm circuit board 3 and connector 4 are connected via positioning holes and fixing slots to install the speaker 28 into the speaker hole 19, the indicator light 27 into the indicator light hole 24, and the alarm circuit board switch 26 into place via the alarm circuit board switch recess 25. In this embodiment, connector cover plate mounting holes A22 and B23 are provided on both sides of the top plate of connector 4, and connector mounting through holes A20 and B21 are provided between the two sides. Connector 4 and base 1 are fixed together by screws passing through connector mounting through holes A20 and A16, and screws passing through connector mounting through holes B21 and B17. The indicator light hole 24 is located between connector mounting through holes A20 and B21. One of the power inlet / outlet clamping screw holes b corresponding to the neutral wire connector has a connector hole A33 inside, and one of the power inlet / outlet clamping screw holes b corresponding to any live wire connector has a connector hole B34 inside; the alarm circuit board 3 is provided with connector A29 and connector B30 respectively, and connector A29 and connector B30 are respectively inserted into connector holes A33 and connector holes B34.

[0042] In this embodiment, the connector cover plate 5 is provided with connector cover plate mounting through holes A31 and B32 for connecting to the connector 4. The connector cover plate 5 and the connector 4 are fixedly connected by screws passing through the connector cover plate mounting through holes A31 and A22, and screws passing through the connector cover plate mounting through holes B32 and B23.

[0043] like Figure 9 , Figure 10 The diagram shown is a circuit structure diagram and a schematic diagram of the circuit connection relationship of the alarm circuit board 3 of the present invention. The connection relationship in the diagram includes: a switching circuit 35, a half-wave rectifier circuit 36, and an AC-to-DC circuit 37 connected in sequence between the 220V voltage and the ground line GND. The AC-to-DC circuit 37 is also connected to the voice circuit 38.

[0044] The switching circuit 35 includes an alarm circuit board switch 26 (i.e., the normally closed limit switch SW1 in the figure) and a fuse F1 connected in sequence. When the energy meter is plugged into the metal connector 6, it touches the contact end of the normally closed limit switch SW1, pressing the normally closed limit switch SW1 to open it and make the circuit closed, so that the indicator light 27 and the speaker 28 are in the off state. When the meter box is moved, since there is no pressure on the normally closed limit switch SW1, the normally closed limit switch SW1 returns to the normally closed state, the circuit is connected, the indicator light 27 lights up, and the speaker 28 broadcasts a voice prompt.

[0045] The half-wave rectifier circuit 36 ​​includes: a rectifier diode D1 and a capacitor C1. The input terminal of the rectifier diode D1 is connected to a fuse F1, the output terminal of the rectifier diode D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to ground GND.

[0046] The AC-to-DC circuit 37 includes: the input terminal Vin of the AC / DC chip is connected to the output terminal of the rectifier diode D1; the GND terminal of the AC / DC chip is connected to the ground GND through resistor R1 and reverse diode D2; the output terminal Vout of the AC / DC chip outputs a +5V DC power supply after passing through rectifier diode D3; the +5V DC power supply is connected between resistor R1 and reverse diode D2 after passing through current-limiting resistor R3 and power inductor L1 in parallel; the output terminal Vout of the AC / DC chip is connected between resistor R1 and reverse diode D2 through capacitor C2; a wire is led out from resistor R1 and reverse diode D2 and connected to the ground GND after passing through indicator light RED1; the +5V DC power supply is also grounded through resistor R2 and capacitor C3; the +5V DC power supply is also connected to the voice circuit 38.

[0047] The voice circuit 38 includes a voice chip U2 and a speaker 28 (i.e., P3 in the figure). The two pins of the speaker P3 are connected to the PWM1 and PWM2 pins of the voice chip U2, respectively. The VDD pin of the voice chip U2 is connected to a +5V DC power supply, and the GND pin is grounded. A filter capacitor C4 is connected between the VDD pin and the GND pin of the voice chip U2.

[0048] Capacitor C1 is an electrolytic capacitor, capacitor C2 is a surface-mount capacitor, chip U1 is model TT119, voice broadcast chip U2 is model NY3M016AE8, and the integrated voice storage chip is a programmable control chip capable of storing 16 seconds or more of the voice data. Resistor R2 is a constant voltage resistor. Indicator RED1 (i.e., indicator 27) is an LED indicator, providing a red, white, or other colored light source. Capacitor C3 is a voltage stabilizing filter capacitor. Capacitor C4 is a high-frequency filter capacitor.

[0049] In this embodiment, the seven connector metal terminals 6 are one neutral wire terminal, three live wire inlet terminals, and three live wire outlet terminals, all of which are connected to the electricity meter. Each live wire outlet terminal and neutral wire terminal is also connected to the L phase and N phase in the circuit diagram, respectively.

[0050] The working principle of this invention is as follows:

[0051] The electricity meter is slidably inserted into the card head 7 and the connector metal connector head 6. The seven connector metal connector heads 6 are on the same axis as the electricity meter wiring holes. The electricity meter clamping screws are connected to the electricity meter mounting holes A11 and B12 on the base 1 through the electricity meter mounting holes. The connector metal connector heads 6 are clamped by the electricity meter clamping screws to complete the installation of the electricity meter.

[0052] The external power cord enters the power inlet / outlet hole d on the metal connector 6 through the power inlet / outlet hole c on connector 4. The power inlet / outlet clamping screw passes through the power inlet / outlet clamping screw hole b on connector 4 and connects to the power inlet / outlet clamping screw hole e on the metal connector 6, securing the external power cord. The external power cord supplies power to the alarm circuit board 3 through the metal connector 6, connector A29, and connector B30. When the energy meter is slidably inserted into the card 7 and the metal connector 6, the bottom of the energy meter presses against the alarm circuit board switch 26, triggering a voice alarm and turning off the indicator light 27. When the energy meter is slid out, the bottom of the energy meter disengages from the alarm circuit board switch 26 and the pressure stops, triggering an alarm signal: the indicator light 27 illuminates and the speaker 28 emits a voice alarm.

[0053] Circuit working principle:

[0054] When AC 220V is input, the normally closed limit switch SW1 (alarm circuit board switch 26) is permanently closed. At this time, pins 7 and 8 of the voice IC chip U2 output PWM signals to drive speaker P3 (speaker 28), and speaker P3 begins to emit an audible warning. Since the AC 220V input passes through the normally closed limit switch SW1 to the fuse F1, when the short-circuit current exceeds 500mA, the fuse F1 blows. The AC 220V then passes through fuse F1 to the rectifier diode D1, forming a half-wave rectifier circuit with the electrolytic capacitor C1, and is then input to the AC-to-DC IC chip U1. When the output voltage of the AC-to-DC IC chip U1 is sensed by its output pin Vout, and the internal MOS of the AC-to-DC IC chip U1 is turned off when the power inductor L1 reaches its design value, the resistor R2 and the surface-mount capacitor C2 constitute the power dissipation Rcs. N is the reference GND. Then, it passes through the reverse recovery diode D2, and then through the current limiting resistor R1 to the GND pin of the AC-to-DC IC chip U1. The Vout output of the AC-to-DC IC chip U1 is connected to the rectifier diode D3 to obtain a 5V voltage. Then, the 5V voltage passes through the current limiting resistor R3 to the positive terminal of indicator light 27, causing indicator light RED1 to light up. Resistor R2 is a constant voltage resistor, capacitor C3 is a voltage stabilizing filter capacitor, and capacitor C4 is a high-frequency filter capacitor. After voltage stabilization and high-frequency filtering by voltage stabilizing filter capacitor C3 and high-frequency filter capacitor C4, it reaches pin 6 of the voice broadcast chip U2. At this time, the voice broadcast chip U2 outputs a PWM signal, and the PWM drives the speaker P3 to start emitting sound.

[0055] The main control method is that when the energy meter is removed from the meter holder, the normally closed power switch returns to its original position and the power supply is turned on. At the same time, the regulated power supply works to power the LED and the voice broadcast chip, illuminating the LED, which remains lit during the meter removal process. Simultaneously, a voice broadcast is given once or continuously as an operation warning.

Claims

1. A multifunctional three-phase energy meter connector, characterized in that: The device includes a base (1), an alarm circuit board cover (2), an alarm circuit board (3), a connector (4), a connector cover (5), and a connector metal connector (6). The base (1) is connected to the meter box. The alarm circuit board cover (2) is fixed to one side of the connector (4), and the connector (4) with the alarm circuit board (2) fixed to it is installed on the base (1). The connector cover (5) is installed on the opposite side of the connector (4). The alarm circuit board (3) is housed in the space enclosed by the alarm circuit board cover (2) and the connector (4). The alarm circuit board (3) is provided with an alarm circuit board switch (26), an alarm device, and a connector. The contact end of the alarm circuit board switch (26) extends from the connector (4). The connector (4) is equipped with connector metal connectors (6) that correspond one-to-one with the number of wiring holes of the energy meter. The alarm circuit board (3) is connected to the connector metal connectors (6) through the contact piece. The external power supply line supplies power to the alarm circuit board (3) through the connector metal connectors (6). When the energy meter is plugged into the connector metal connectors (6), it touches the contact end of the alarm circuit board switch (26), and the alarm device is in the off state. When the energy meter is pulled out, it is disconnected from the contact end of the alarm circuit board switch (26), and the alarm device issues an alarm message.

2. The multifunctional three-phase energy meter connector according to claim 1, characterized in that: The base (1) is provided with mounting holes for connecting to standard single-meter and four-meter meter boxes and non-standard single-meter and four-meter meter boxes. The base (1) is also provided with mounting holes for connecting to connectors (4) and mounting holes for connecting to the electricity meter. The base (1) is provided with clips (7) for sliding connection with the electricity meter.

3. The multifunctional three-phase energy meter connector according to claim 1, characterized in that: The alarm circuit board (3) includes an alarm circuit, which is connected in sequence between the 220V voltage and the ground line GND, a switching circuit (35), a half-wave rectifier circuit (36), and an AC to DC circuit (37). The alarm device includes an indicator light (27) and a voice circuit (38). The AC to DC circuit (37) is also connected to the voice circuit (38).

4. The multifunctional three-phase energy meter connector according to claim 3, characterized in that: The switching circuit (35) includes an alarm circuit board switch (26) and a fuse F1 connected in sequence.

5. The multifunctional three-phase energy meter connector according to claim 4, characterized in that: The half-wave rectifier circuit (36) includes a rectifier diode D1 and a capacitor C1. The input terminal of the rectifier diode D1 is connected to a fuse F1, the output terminal of the rectifier diode D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to ground GND.

6. The multifunctional three-phase energy meter connector according to claim 5, characterized in that: The AC to DC circuit (37) includes an input terminal Vin of AC / DC chip U1 connected to the output terminal of rectifier diode D1; and a ground terminal GND of AC / DC chip connected to ground line GND via resistor R1 and reverse diode D2. The output terminal Vout of AC / DC chip U1 outputs a +5V DC power supply after passing through rectifier diode D3. The +5V DC power supply is connected between resistor R1 and reverse diode D2 after passing through current limiting resistor R3 and power inductor L1 in parallel. The output terminal Vout of AC / DC chip U1 is connected between resistor R1 and reverse diode D2 through capacitor C2. The wires led out from resistor R1 and reverse diode D2 pass through indicator light (27) and are connected to ground wire GND. The +5V DC power supply is also grounded through resistor R2 and capacitor C3. The +5V DC power supply is also connected to voice circuit (38).

7. The multifunctional three-phase energy meter connector according to claim 6, characterized in that: The voice circuit (38) includes a voice chip U2 and a speaker (28). The two pins of the speaker (28) are connected to the PWM1 and PWM2 pins of the voice chip U2, respectively. The VDD pin of the voice chip U2 is connected to a +5V DC power supply, and the GND pin is grounded. A filter capacitor C4 is connected between the VDD pin and the GND pin of the voice chip U2.

8. The multifunctional three-phase energy meter connector according to claim 1, characterized in that: One side of the connector (4) is provided with an alarm circuit board switch clearance groove (25) and a connector metal connector mounting hole (a). The contact end of the alarm circuit board switch (26) extends out from the alarm circuit board switch clearance groove (25). The other side of the connector (4) is provided with a speaker hole (19) corresponding to the speaker (28) in the alarm device and a power input / output line through hole (c). The top plate of the connector (4) is provided with a connector mounting through hole for connecting to the base (1), a connector cover plate mounting bottom hole for connecting to the connector cover plate (5), an indicator light hole (24) corresponding to the indicator light (27) in the alarm device, and a power input / output line clamping screw through hole (b) for fastening the external power line to the connector metal connector (6).

9. The multifunctional three-phase energy meter connector according to claim 8, characterized in that: The connector metal connector (6) consists of seven parts, namely one neutral wire connector, three live wire inlet connectors, and three live wire outlet connectors. The power inlet / outlet clamping screw through hole (b) corresponding to the neutral wire connector is provided with a connector hole A (33), and the power inlet / outlet clamping screw through hole (b) corresponding to any of the live wire inlet connectors is provided with a connector hole B (34). The alarm circuit board (3) is provided with connector A (29) and connector B (30), and connector A (29) and connector B (30) are respectively inserted into connector hole A (33) and connector hole B (34).

10. The multifunctional three-phase energy meter connector according to claim 1, characterized in that: One side of the connector metal connector (6) is inserted into the wiring hole of the energy meter, and the other side has a bottom hole (d) for power inlet and outlet lines. The top of the connector metal connector (6) has a bottom hole (e) for power inlet and outlet line clamping screws for fastening the external power line to the connector metal connector (6).

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