Miniature three-phase wireless communication intelligent electric meter

Abstract

The utility model discloses a miniature three-phase wireless communication intelligent electric meter, which comprises a main control circuit, and a voltage acquisition circuit, a current acquisition circuit, a WiFi circuit and an RS485 circuit which are respectively and electrically connected with the main control circuit, the voltage acquisition circuit comprises an A-phase voltage acquisition circuit, a B-phase voltage acquisition circuit and a C-phase voltage acquisition circuit. According to the miniature three-phase wireless communication intelligent electric meter disclosed by the utility model, linkage is carried out through the main control circuit, the voltage acquisition circuit, the current acquisition circuit, the WiFi circuit and the RS485 circuit, two communication modes of RS485 and WiFi are supported, two communication requirements of wired communication and wireless communication are met, wireless communication can be realized through uploading an electric meter firmware upgrade package on a platform, and the communication efficiency is improved. And the firmware bug is issued to the ammeter through the network, so that the ammeter firmware bug can be simply repaired.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power metering, and particularly relates to a miniature three-phase wireless communication intelligent electric meter. Background Art

[0002] With the rapid development of the new energy vehicle industry, the demand for charging piles is increasing. Traditional induction type electric energy meters cannot meet the needs of emerging power grid metering, and electronic electric meters need to be used instead. Electronic electric energy meters have the advantages of accuracy, stability, small size and rich functions, and have been widely used in the field of electric energy metering. However, the existing three-phase intelligent electric energy meters have the disadvantages of not supporting wireless upgrade of the electric meter firmware, single communication mode and large occupied space.

[0003] Therefore, in view of the above problems, further improvements are made. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a miniature three-phase wireless communication intelligent electric meter, which is linked through a main control circuit, a voltage acquisition circuit, a current acquisition circuit, a WiFi circuit and an RS485 circuit, supports two communication modes of RS485 and WiFi, meets the two communication requirements of wired and wireless, and the wireless communication can upload the electric meter firmware upgrade package on the platform and send it to the electric meter through the network, and can simply repair the bug of the electric meter firmware.

[0005] To achieve the above object, the utility model provides a miniature three-phase wireless communication intelligent electric meter, including a main control circuit and a voltage acquisition circuit, a current acquisition circuit, a WiFi circuit and an RS485 circuit which are respectively and electrically connected with the main control circuit, wherein:

[0006] The main control circuit includes a main controller U4, the voltage acquisition circuit includes a phase A voltage acquisition circuit, a phase B voltage acquisition circuit and a phase C voltage acquisition circuit. The input end of the phase A voltage acquisition circuit is connected to the live wire end UA, and the output end of the phase A voltage acquisition circuit is electrically connected to the main controller U4. The input end of the phase B voltage acquisition circuit is connected to the live wire end UB, and the output end of the phase B voltage acquisition circuit is electrically connected to the main controller U4. The input end of the phase C voltage acquisition circuit is connected to the live wire end UC, and the output end of the phase C voltage acquisition circuit is electrically connected to the main controller U4;

[0007] The current acquisition circuit includes a phase A current acquisition circuit, a phase B current acquisition circuit, and a phase C current acquisition circuit. The input end of the phase A current acquisition circuit is connected to a phase A current transformer, and the output end of the phase A current acquisition circuit is connected to the main controller U4. The input end of the phase B current acquisition circuit is connected to a phase B current transformer, and the output end of the phase B current acquisition circuit is connected to the main controller U4. The input end of the phase C current acquisition circuit is connected to a phase C current transformer, and the output end of the phase C current acquisition circuit is connected to the main controller U4;

[0008] The WiFi circuit includes a communication chip U6. The 27th pin of the communication chip U6 is electrically connected to the 48th pin of the main controller U4 through a resistor R66, and the 28th pin of the communication chip U6 is electrically connected to the 47th pin of the main controller U4 through a resistor R65;

[0009] The RS485 circuit includes a digital isolation chip U7 and a transceiver US1. The 3rd pin of the digital isolation chip U7 is electrically connected to the 40th pin of the main controller U4, the 4th pin of the digital isolation chip U7 is electrically connected to the 39th pin of the main controller U4, the 5th pin of the digital isolation chip U7 is electrically connected to the 38th pin of the main controller U4. The 1st pin of the transceiver US1 is electrically connected to the 12th pin of the digital isolation chip U7 through a resistor R70, the 2nd pin of the transceiver US1 is electrically connected to the 14th pin of the digital isolation chip U7 through a resistor R72, and the 4th pin of the transceiver US1 is electrically connected to the 13th pin of the digital isolation chip U7 through a resistor R73;

[0010] The model of the main controller U4 is HT7627S, and the model of the communication chip U6 is ESP32-WROOM-32E-N8.

[0011] As a further preferred technical solution of the above technical solution, the live wire terminal UA is electrically connected to the 17th pin of the main controller U4 through resistors R16, R17, R18, R19, R20, and R21 in sequence. One end of the resistor R21 far from the resistor R20 is electrically connected to the 18th pin of the main controller U4 through resistors R24 and R29. Both ends of the resistor R24 are connected in parallel with a capacitor C15, and both ends of the resistor R29 are connected in parallel with a capacitor C19;

[0012] The live wire terminal UB is electrically connected to the 19th pin of the main controller U4 through resistors R77, R31, R32, R33, R34, R35, and R36 in sequence. One end of the resistor R36 away from the resistor R35 is electrically connected to the 20th pin of the main controller U4 through resistors R39 and R42. Capacitor C25 is connected in parallel at both ends of the resistor R39, and capacitor C27 is connected in parallel at both ends of the resistor R42;

[0013] The live wire terminal UC is electrically connected to the 21st pin of the main controller U4 through resistors R78, R45, R46, R47, R48, R49, and R50 in sequence. One end of the resistor R50 away from the resistor R49 is electrically connected to the 22nd pin of the main controller U4 through resistors R54 and R59. Capacitor C29 is connected in parallel at both ends of the resistor R54, and capacitor C33 is connected in parallel at both ends of the resistor R59.

[0014] As a further preferred technical solution of the above technical solution, the A-phase current acquisition circuit includes resistors R15, R22, R25, and R26 connected in sequence. One end of the resistor R15 close to the resistor R22 is connected to the A-phase current transformer, and the other end of the resistor R15 away from the resistor R22 is electrically connected to the 6th pin of the main controller U4. One end of the resistor R26 close to the resistor R25 is connected to the A-phase current transformer, and the other end of the resistor R26 away from the resistor R25 is electrically connected to the 7th pin of the main controller U4;

[0015] The B-phase current acquisition circuit includes resistors R37, R38, R40, and R41 connected in sequence. One end of the resistor R37 close to the resistor R38 is connected to the B-phase current transformer, and the other end of the resistor R37 away from the resistor R38 is electrically connected to the 9th pin of the main controller U4. One end of the resistor R41 close to the resistor R40 is connected to the B-phase current transformer, and the other end of the resistor R41 away from the resistor R40 is electrically connected to the 10th pin of the main controller U4;

[0016] The C-phase current acquisition circuit includes resistors R52, R55, R57, and R58 connected in sequence. One end of the resistor R52 close to the resistor R55 is connected to the C-phase current transformer, and the other end of the resistor R52 away from the resistor R55 is electrically connected to the 12th pin of the main controller U4. One end of the resistor R58 close to the resistor R57 is connected to the C-phase current transformer, and the other end of the resistor R58 away from the resistor R57 is electrically connected to the 13th pin of the main controller U4.

[0017] As a further preferred technical solution of the above technical solution, it further includes a communication power supply circuit, and the communication power supply circuit includes a triode Q4 and a transformer T2. The base of the triode Q4 is electrically connected to the 46th pin of the main controller U4 through a resistor R64, and the collector of the triode Q4 is electrically connected to the second input terminal (pin 2) of the transformer T2. The first output terminal (pin 3) of the transformer T2 is connected to a voltage regulator U5 through a diode D4.

[0018] As a further preferred technical solution of the above technical solution, it further includes a power supply circuit, and the power supply circuit is electrically connected to the main control circuit, the WiFi circuit, and the RS485 circuit respectively. Description of the Drawings

[0019] Figure 1 It is the main control circuit diagram of a micro three-phase wireless communication intelligent electric meter of the present invention.

[0020] Figure 2 It is the voltage acquisition circuit diagram of a micro three-phase wireless communication intelligent electric meter of the present invention.

[0021] Figure 3 It is the current acquisition circuit diagram of a micro three-phase wireless communication intelligent electric meter of the present invention.

[0022] Figure 4 It is the WiFi circuit diagram of a micro three-phase wireless communication intelligent electric meter of the present invention.

[0023] Figure 5 It is the RS485 circuit diagram of a micro three-phase wireless communication intelligent electric meter of the present invention.

[0024] Figure 6 It is the communication power supply circuit diagram of a micro three-phase wireless communication intelligent electric meter of the present invention.

[0025] Figure 7 It is the power supply circuit diagram of a micro three-phase wireless communication intelligent electric meter of the present invention. Detailed Embodiments

[0026] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present invention.

[0027] The present utility model discloses a miniature three-phase wireless communication intelligent electric meter. The specific embodiments of the utility model will be further described below in conjunction with the preferred embodiments.

[0028] In the embodiments of the present utility model, those skilled in the art should note that the live wire terminals and the like involved in the present utility model can be regarded as the prior art.

[0029] Preferred embodiments.

[0030] As Figures 1-7 shown, the present utility model discloses a miniature three-phase wireless communication intelligent electric meter, which includes a main control circuit and a voltage acquisition circuit, a current acquisition circuit, a WiFi circuit, and an RS485 circuit that are respectively electrically connected to the main control circuit. Among them:

[0031] The main control circuit includes a main controller U4. The voltage acquisition circuit includes an A-phase voltage acquisition circuit, a B-phase voltage acquisition circuit, and a C-phase voltage acquisition circuit. The input end of the A-phase voltage acquisition circuit is connected to the live wire terminal UA, and the output end of the A-phase voltage acquisition circuit is electrically connected to the main controller U4. The input end of the B-phase voltage acquisition circuit is connected to the live wire terminal UB, and the output end of the B-phase voltage acquisition circuit is electrically connected to the main controller U4. The input end of the C-phase voltage acquisition circuit is connected to the live wire terminal UC, and the output end of the C-phase voltage acquisition circuit is electrically connected to the main controller U4;

[0032] The current acquisition circuit includes an A-phase current acquisition circuit, a B-phase current acquisition circuit, and a C-phase current acquisition circuit. The input end of the A-phase current acquisition circuit is connected to the A-phase current transformer, and the output end of the A-phase current acquisition circuit is connected to the main controller U4. The input end of the B-phase current acquisition circuit is connected to the B-phase current transformer, and the output end of the B-phase current acquisition circuit is connected to the main controller U4. The input end of the C-phase current acquisition circuit is connected to the C-phase current transformer, and the output end of the C-phase current acquisition circuit is connected to the main controller U4;

[0033] The WiFi circuit includes a communication chip U6. The 27th pin of the communication chip U6 is electrically connected to the 48th pin of the main controller U4 through a resistor R66. The 28th pin of the communication chip U6 is electrically connected to the 47th pin of the main controller U4 through a resistor R65;

[0034] The RS485 circuit includes a digital isolation chip U7 and a transceiver US1. The 3-pin of the digital isolation chip U7 is electrically connected to the 40-pin of the master controller U4. The 4-pin of the digital isolation chip U7 is electrically connected to the 39-pin of the master controller U4. The 5-pin of the digital isolation chip U7 is electrically connected to the 38-pin of the master controller U4. The 1-pin of the transceiver US1 is electrically connected to the 12-pin of the digital isolation chip U7 through a resistor R70. The 2-pin of the transceiver US1 is electrically connected to the 14-pin of the digital isolation chip U7 through a resistor R72. The 4-pin of the transceiver US1 is electrically connected to the 13-pin of the digital isolation chip U7 through a resistor R73;

[0035] The model of the master controller U4 is HT7627S, and the model of the communication chip U6 is ESP32-WROOM-32E-N8.

[0036] Specifically, the live wire terminal UA is sequentially electrically connected to the 17-pin of the master controller U4 through resistors R16, R17, R18, R19, R20, and R21. One end of the resistor R21 away from the resistor R20 is electrically connected to the 18-pin of the master controller U4 through resistors R24 and R29. Capacitor C15 is connected in parallel across both ends of the resistor R24, and capacitor C19 is connected in parallel across both ends of the resistor R29;

[0037] The live wire terminal UB is sequentially electrically connected to the 19-pin of the master controller U4 through resistors R77, R31, R32, R33, R34, R35, and R36. One end of the resistor R36 away from the resistor R35 is electrically connected to the 20-pin of the master controller U4 through resistors R39 and R42. Capacitor C25 is connected in parallel across both ends of the resistor R39, and capacitor C27 is connected in parallel across both ends of the resistor R42;

[0038] The live wire terminal UC is sequentially electrically connected to the 21-pin of the master controller U4 through resistors R78, R45, R46, R47, R48, R49, and R50. One end of the resistor R50 away from the resistor R49 is electrically connected to the 22-pin of the master controller U4 through resistors R54 and R59. Capacitor C29 is connected in parallel across both ends of the resistor R54, and capacitor C33 is connected in parallel across both ends of the resistor R59.

[0039] More specifically, the phase A current acquisition circuit includes resistors R15, R22, R25, and R26 connected in sequence. One end of resistor R15 close to resistor R22 is connected to the phase A current transformer, and the other end of resistor R15 far from resistor R22 is electrically connected to pin 6 of the main controller U4. One end of resistor R26 close to resistor R25 is connected to the phase A current transformer, and the other end of resistor R26 far from resistor R25 is electrically connected to pin 7 of the main controller U4;

[0040] The phase B current acquisition circuit includes resistors R37, R38, R40, and R41 connected in sequence. One end of resistor R37 close to resistor R38 is connected to the phase B current transformer, and the other end of resistor R37 far from resistor R38 is electrically connected to pin 9 of the main controller U4. One end of resistor R41 close to resistor R40 is connected to the phase B current transformer, and the other end of resistor R41 far from resistor R40 is electrically connected to pin 10 of the main controller U4;

[0041] The phase C current acquisition circuit includes resistors R52, R55, R57, and R58 connected in sequence. One end of resistor R52 close to resistor R55 is connected to the phase C current transformer, and the other end of resistor R52 far from resistor R55 is electrically connected to pin 12 of the main controller U4. One end of resistor R58 close to resistor R57 is connected to the phase C current transformer, and the other end of resistor R58 far from resistor R57 is electrically connected to pin 13 of the main controller U4.

[0042] Furthermore, it also includes a communication power supply circuit, which includes a triode Q4 and a transformer T2. The base of the triode Q4 is electrically connected to pin 46 of the main controller U4 through a resistor R64, and the collector of the triode Q4 is electrically connected to the second input terminal (pin 2) of the transformer T2. The first output terminal (pin 3) of the transformer T2 is connected to a voltage regulator U5 through a diode D4.

[0043] Even further, it also includes a power supply circuit, which is electrically connected to the main control circuit, the WiFi circuit, and the RS485 circuit respectively.

[0044] Regarding the present utility model:

[0045] For the power supply circuit, three live wires L1 (UA), L2 (UB), and L3 (UC) are input to the LS05-26B05R3 power supply module through rectifying diodes to supply power to the electric meter. This power supply module supports AC and DC input and has a regulated 5V DC output.

[0046] Three live wires are respectively input into the main control chip of the electric meter after three-way resistor voltage division to obtain voltage data. The main control chip of the electric meter is used to coordinate the work of various modules. The main control chip internally includes an electric energy metering module, which is responsible for obtaining electric energy data.

[0047] Three external current transformers (used for current sampling, and the electric energy metering module converts the analog data of the current transformer into current values) respectively sample the currents on L1, L2, and L3, and are connected to the electric meter through an RJ12 interface. The three-way current waveforms are input into the main control chip of the electric meter to obtain current data.

[0048] The ESP32 WiFi module communicates with the main control chip of the electric meter through a serial port. After the WiFi is connected to the Internet, the electric meter sends electric energy data such as voltage and current to the platform, and the metering data can be remotely viewed through a web page. By uploading the electric meter firmware upgrade package on the platform and sending it to the electric meter through the network, the firmware bugs of the electric meter can be simply repaired.

[0049] The serial port line of the main control chip of the electric meter is connected to the BL3085 RS485 chip through a digital isolation chip to convert it into an RS485 signal, and the electric meter sends the electric energy data to other devices through the 485 signal line.

[0050] For the communication power supply circuit, a PWM is used to drive a transformer to generate a 5V voltage isolated from the previous stage. This voltage is used for the power supply of the RS485 circuit to prevent high-voltage signals in the electric meter from damaging external devices and causing electric shock accidents (generating 3.3V for RS485 power supply, and this power supply is isolated from the previous stage to ensure safe use).

[0051] One button is used to reset the WiFi connection, one red LED is used for pulse output display, one green LED is used for RS485 status display. One two-color light is used for WiFi status display.

[0052] The beneficial effects of the present utility model are as follows:

[0053] 1. Small volume, 91mm long and 19mm wide, convenient for installation in a narrow space.

[0054] 2. Two communication methods: wired and wireless.

[0055] 3. Quick wiring for the terminal block, no tools required.

[0056] 4. The power is updated quickly in 50ms.

[0057] 5. Support 1P2W, 3P3W, and 3P4W wire systems.

[0058] It is worth mentioning that technical features such as the live wire end involved in the patent application of the present utility model should be regarded as the prior art. For the specific structures, working principles, possible control methods, and spatial arrangement methods of these technical features, conventional selections in the art can be adopted, and they should not be regarded as the invention points of the patent of the present utility model. The patent of the present utility model will not be further specifically elaborated.

[0059] For those skilled in the art, it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A miniature three-phase wireless communication smart meter, characterized in that: It includes a main control circuit and a voltage acquisition circuit, a current acquisition circuit, a WiFi circuit and an RS485 circuit electrically connected to the main control circuit respectively, wherein: The main control circuit includes a main controller U4, and the voltage acquisition circuit includes an A-phase voltage acquisition circuit, a B-phase voltage acquisition circuit and a C-phase voltage acquisition circuit. The input end of the A-phase voltage acquisition circuit is connected to the live wire end UA and the output end of the A-phase voltage acquisition circuit is electrically connected to the main controller U4, the input end of the B-phase voltage acquisition circuit is connected to the live wire end UB and the output end of the B-phase voltage acquisition circuit is electrically connected to the main controller U4, the input end of the C-phase voltage acquisition circuit is connected to the live wire end UC and the output end of the C-phase voltage acquisition circuit is electrically connected to the main controller U4; The current acquisition circuit includes an A-phase current acquisition circuit, a B-phase current acquisition circuit and a C-phase current acquisition circuit, wherein the input end of the A-phase current acquisition circuit is connected to the A-phase current transformer and the output end of the A-phase current acquisition circuit is connected to the main controller U4, the input end of the B-phase current acquisition circuit is connected to the B-phase current transformer and the output end of the B-phase current acquisition circuit is connected to the main controller U4, the input end of the C-phase current acquisition circuit is connected to the C-phase current transformer and the output end of the C-phase current acquisition circuit is connected to the main controller U4; The WiFi circuit includes a communication chip U6, and the pin 27 of the communication chip U6 is electrically connected to the pin 48 of the main controller U4 through a resistor R66, and the pin 28 of the communication chip U6 is electrically connected to the pin 47 of the main controller U4 through a resistor R65; The RS485 circuit includes a digital isolation chip U7 and a transceiver US1, wherein pin 3 of the digital isolation chip U7 is electrically connected to pin 40 of the main controller U4, pin 4 of the digital isolation chip U7 is electrically connected to pin 39 of the main controller U4, pin 5 of the digital isolation chip U7 is electrically connected to pin 38 of the main controller U4, pin 1 of the transceiver US1 is electrically connected to pin 12 of the digital isolation chip U7 through a resistor R70, pin 2 of the transceiver US1 is electrically connected to pin 14 of the digital isolation chip U7 through a resistor R72, and pin 4 of the transceiver US1 is electrically connected to pin 13 of the digital isolation chip U7 through a resistor R73; The model of the main controller U4 is HT7627S, and the model of the communication chip U6 is ESP32-WROOM-32E-N8.

2. A miniature three-phase wireless communication smart meter according to claim 1, characterized in that: The live wire terminal UA is electrically connected to the pin 17 of the main controller U4 through resistors R16, R17, R18, R19, R20 and R21 in sequence, and the end of the resistor R21 away from the resistor R20 is electrically connected to the pin 18 of the main controller U4 through resistors R24 and R29, and the two ends of the resistor R24 ​​are connected in parallel with a capacitor C15 and the two ends of the resistor R29 are connected in parallel with a capacitor C19; The live wire terminal UB is electrically connected to the pin 19 of the main controller U4 through resistors R77, R31, R32, R33, R34, R35 and R36 in sequence, and the end of the resistor R36 away from the resistor R35 is electrically connected to the pin 20 of the main controller U4 through resistors R39 and R42, and the two ends of the resistor R39 are connected in parallel with capacitor C25 and the two ends of the resistor R42 are connected in parallel with capacitor C27; The live wire terminal UC is electrically connected to pin 21 of the main controller U4 through resistors R78, R45, R46, R47, R48, R49 and R50 in sequence, and one end of the resistor R50 away from the resistor R49 is electrically connected to pin 22 of the main controller U4 through resistors R54 and R59, and both ends of the resistor R54 are connected in parallel with capacitor C29 and both ends of the resistor R59 are connected in parallel with capacitor C33.

3. A miniature three-phase wireless communication smart meter according to claim 2, characterized in that: The A-phase current acquisition circuit includes a resistor R15, a resistor R22, a resistor R25 and a resistor R26 connected in sequence, wherein one end of the resistor R15 close to the resistor R22 is connected to the A-phase current transformer and one end of the resistor R15 away from the resistor R22 is electrically connected to pin 6 of the main controller U4, and one end of the resistor R26 close to the resistor R25 is connected to the A-phase current transformer and one end of the resistor R26 away from the resistor R25 is electrically connected to pin 7 of the main controller U4; The B-phase current acquisition circuit includes a resistor R37, a resistor R38, a resistor R40 and a resistor R41 connected in sequence, wherein one end of the resistor R37 close to the resistor R38 is connected to the B-phase current transformer and one end of the resistor R37 away from the resistor R38 is electrically connected to pin 9 of the main controller U4, and one end of the resistor R41 close to the resistor R40 is connected to the B-phase current transformer and one end of the resistor R41 away from the resistor R40 is electrically connected to pin 10 of the main controller U4; The C-phase current acquisition circuit includes a resistor R52, a resistor R55, a resistor R57 and a resistor R58 connected in sequence, wherein one end of the resistor R52 close to the resistor R55 is connected to the C-phase current transformer and one end of the resistor R52 away from the resistor R55 is electrically connected to pin 12 of the main controller U4, one end of the resistor R58 close to the resistor R57 is connected to the C-phase current transformer and one end of the resistor R58 away from the resistor R57 is electrically connected to pin 13 of the main controller U4.

4. A miniature three-phase wireless communication smart meter according to claim 3, characterized in that: It also includes a communication power supply circuit, which includes a transistor Q4 and a transformer T2. The base of the transistor Q4 is electrically connected to the 46 pin of the main controller U4 through a resistor R64, and the collector of the transistor Q4 is electrically connected to the second input end of the transformer T2. The first output end of the transformer T2 is connected to the voltage regulator U5 through a diode D4.

5. A miniature three-phase wireless communication smart meter according to claim 4, characterized in that: It also includes a power supply circuit, which is electrically connected to the main control circuit, the WiFi circuit and the RS485 circuit respectively.

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