Built-in positioning module of electric energy meter

Abstract

The utility model discloses a built-in positioning module of an electric energy meter, which can be applied to the technical field of electric energy meters, is welded on a built-in mainboard of the electric energy meter, and comprises a G7A module, an electric energy meter interface circuit, a power taking module, a power supply module and a signal acquisition module, the signal acquisition module comprises an antenna; one end of the electric meter interface circuit is connected with the G7A module, and the other end is connected with the electric meter for transmitting satellite signals from the G7A module to the electric meter; one end of the electricity taking module is connected with the electricity meter, and the other end of the electricity taking module is connected with the G7A module for taking electricity from the electricity meter to the G7A module; the signal acquisition module is connected with the G7A module and is used for sending an acquired satellite signal to the G7A module; and one end of the power supply module is connected with the G7A module, and the other end is connected with the signal acquisition module for supplying power to the antenna. Thus, the positioning module is independently designed and is installed in the electric meter for effective theft prevention, and the safety of the positioning module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy meters, in particular to a built-in positioning module of an electric energy meter. Background Art

[0002] As an efficient, convenient and clean secondary energy source, electric energy can not only replace the traditional combustion-based energy acquisition method, but also be applied to emerging fields such as smart grids. As one of the basic devices for smart grid data collection, electric energy meters undertake the tasks of collecting, measuring and transmitting original electric energy data, and are the basis for realizing information integration, analysis optimization and information display.

[0003] For safety reasons, the energy meter needs to be inspected on site every once in a while. However, due to the large number of energy meters installed and their scattered locations, each inspection takes a lot of time. Therefore, it is necessary to install a positioning module for the energy meter to improve the inspection time. However, the existing positioning module is generally designed together with the external communication module, which is easy to be damaged, resulting in low security of the positioning module.

[0004] Therefore, how to improve the security of the positioning module is a problem that those skilled in the art need to solve urgently. Utility Model Content

[0005] Based on the above problems, the utility model provides a built-in positioning module for an electric energy meter. The positioning module is designed separately and installed inside the electric meter to effectively prevent theft, thereby improving the safety of the positioning module.

[0006] In the first aspect, the embodiment of the utility model provides a built-in positioning module of an electric energy meter, the positioning module is welded on the built-in mainboard of the electric energy meter, and includes: a G7A module, a serial port matching circuit, a power taking module, a power supply module and a signal acquisition module; the signal acquisition module includes: an antenna;

[0007] The signal acquisition module is connected to the G7A module, and is used to acquire the position information through the antenna and send the position information to the G7A module;

[0008] One end of the serial port matching circuit is connected to the G7A module, and the other end is connected to the electric meter, so as to transmit the position information from the G7A module to the electric meter;

[0009] One end of the power taking module is connected to the electric meter, and the other end is connected to the G7A module, and is used to take power from the electric meter to the G7A module;

[0010] One end of the power supply module is connected to the G7A module, and the other end is connected to the signal acquisition module, so as to supply power to the antenna.

[0011] Optionally, the positioning module adopts a double-sided patch design and is vertically mounted on the built-in mainboard of the electric meter through a 1×5P single-row pin;

[0012] The G7A module adopts an 18-pin design.

[0013] Optionally, the signal acquisition module includes: a signal transmission circuit;

[0014] One end of the signal transmission circuit is connected to pin 11 of the G7A module, and the other end is connected to the antenna.

[0015] Optionally, the signal transmission circuit includes: a TVS tube, a seventh capacitor, a third resistor, a fifth capacitor and a sixth capacitor;

[0016] The fifth capacitor, the third resistor and the sixth capacitor together form a π-shaped antenna matching network, and one end of the fifth capacitor is connected to the 11 pin of the G7A module, and the other end is connected to one end of the seventh capacitor;

[0017] The other end of the seventh capacitor is connected to the TVS tube and the antenna respectively.

[0018] Optionally, the signal transmission circuit further includes: an antenna connection device;

[0019] The antenna connecting component is arranged at the connecting end of the seventh capacitor and the TVS tube, and is used to connect the antenna and the signal transmission circuit.

[0020] Optionally, the serial port matching circuit includes: a fifth resistor, a sixth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, an eighth capacitor, a ninth capacitor and a sixteenth capacitor;

[0021] Pin 2 of the G7A module is connected to pin 3 of the meter interface through the tenth resistor;

[0022] Pin 3 of the G7A module pulls up the sixth resistor, pulls down the sixteenth capacitor, and is connected to pin 4 of the meter interface through the eleventh resistor;

[0023] Pin 9 of the G7A module pulls up the fifth resistor, pulls down the eighth capacitor, and is connected to pin 2 of the electric meter interface through the ninth resistor and the ninth capacitor.

[0024] Optionally, the power taking module includes: a second capacitor, a third capacitor and a fourth capacitor;

[0025] The second capacitor, the third capacitor and the fourth capacitor are connected in parallel, and one end of each capacitor is connected to the electric meter and the 7-pin of the G7A module respectively, and the other end of each capacitor is grounded;

[0026] The second capacitor is used for anti-interference, the third capacitor is used for energy storage, and the fourth capacitor is used for filtering.

[0027] Optionally, the power supply module includes: a second resistor, a first capacitor and a first inductor;

[0028] One end of the second resistor is connected to pin 14 of the G7A module, and the other end pulls down the first capacitor and is connected to the signal acquisition module through the first inductor.

[0029] Optionally, the positioning module further includes: a power supply module;

[0030] One end of the power module is connected to pin 2 of the electric meter interface, and the other end is connected to the connection end of the first inductor and the second resistor, so as to supply power to the antenna.

[0031] Optionally, the power module includes: a control module and a power submodule;

[0032] The control module is used to control the switch of the power submodule, including an eighth resistor, a twelfth resistor, a first transistor and a seventh resistor;

[0033] The power submodule is used to power the antenna, and includes an LDO chip, a first resistor, a fourth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor;

[0034] One end of the eighth resistor is connected to pin 2 of the meter interface, and the other end pulls down the twelfth resistor and is connected to the base of the first transistor; the emitter of the first transistor is connected to the other end of the twelfth resistor, and the collector is respectively connected to one end of the seventh resistor and pin 3 of the LDO chip;

[0035] Pin 1 of the LDO chip is respectively connected to the other end of the seventh resistor, the pull-down tenth capacitor, and one end of the first resistor;

[0036] Pin 5 of the LDO chip is respectively connected to the other end of the first resistor, one end of the eleventh capacitor, the twelfth capacitor and the thirteenth capacitor connected in parallel, and one end of the fourth resistor;

[0037] The fourth resistor is connected to a connection terminal of the first inductor and the second resistor.

[0038] It can be seen from the above technical solutions that compared with the prior art, the utility model has the following advantages:

[0039] The utility model discloses a built-in positioning module of an electric energy meter, wherein the positioning module is welded on the built-in mainboard of the electric energy meter, and comprises: a G7A module, an electric energy meter interface circuit, a power taking module, a power supply module and a signal acquisition module; the signal acquisition module comprises: an antenna; one end of the electric energy meter interface circuit is connected to the G7A module, and the other end is connected to the electric energy meter, and is used to transmit satellite signals from the G7A module to the electric energy meter; one end of the power taking module is connected to the electric energy meter, and the other end is connected to the G7A module, and is used to take power from the electric energy meter to the G7A module; the signal acquisition module is connected to the G7A module, and is used to send the acquired satellite signal to the G7A module; one end of the power supply module is connected to the G7A module, and the other end is connected to the signal acquisition module, and is used to power the antenna. In this way, the positioning module is designed separately and installed inside the electric energy meter for effective theft prevention, thereby improving the safety of the positioning module. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a built-in positioning module of an electric energy meter provided in an embodiment of the utility model;

[0041] Figure 2 A schematic diagram of the structure of a signal acquisition module provided by the present invention;

[0042] Figure 3 A schematic diagram of the structure of a signal transmission circuit provided by an embodiment of the utility model;

[0043] Figure 4 A schematic diagram of the structure of a serial port matching circuit provided by an embodiment of the utility model;

[0044] Figure 5 A schematic diagram of the structure of a power supply module provided for an embodiment of the utility model;

[0045] Figure 6 A schematic diagram of the structure of a power supply module provided in an embodiment of the utility model;

[0046] Figure 7 A schematic diagram of the structure of a power module provided by an embodiment of the utility model;

[0047] Figure 8 A circuit connection diagram of a positioning module provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0048] As mentioned above, the existing positioning modules are not very secure. Specifically, the antenna size of existing meters (electricity meters / smart meters) is small, the satellite collection feed surface is small, and the positioning module of the meter is generally external, and supports a pluggable design together with the communication module. Therefore, the positioning accuracy is low and it is easy to be damaged, resulting in low security of the positioning module.

[0049] In order to solve the above problems, the utility model provides a built-in positioning module for an electric energy meter, wherein the positioning module is welded on a built-in mainboard of the electric energy meter, and comprises: a G7A module, an electric meter interface circuit, a power taking module, a power supply module and a signal acquisition module; the signal acquisition module comprises: an antenna; one end of the electric meter interface circuit is connected to the G7A module, and the other end is connected to the electric meter, for transmitting satellite signals from the G7A module to the electric meter; one end of the power taking module is connected to the electric meter, and the other end is connected to the G7A module, for taking power from the electric meter to the G7A module; the signal acquisition module is connected to the G7A module, for sending the acquired satellite signal to the G7A module; one end of the power supply module is connected to the G7A module, and the other end is connected to the signal acquisition module, for powering the antenna.

[0050] In this way, the positioning module is designed separately and installed inside the electric meter to effectively prevent theft, thereby improving the safety of the positioning module.

[0051] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] Figure 1 A schematic diagram of the structure of a built-in positioning module of an electric energy meter provided by an embodiment of the utility model. Figure 1 As shown, the utility model provides a built-in positioning module 100 of an electric energy meter, which is welded on a built-in mainboard of the electric energy meter, and includes: a G7A module 110, a serial port matching circuit 120, a power taking module 130, a power supply module 140 and a signal acquisition module 150; the signal acquisition module 150 includes: an antenna 151;

[0053] The signal acquisition module 150 is connected to the G7A module 110 and is used to acquire the position information through the antenna 151 and send the position information to the G7A module 110;

[0054] One end of the serial port matching circuit 120 is connected to the G7A module 110, and the other end is connected to the electric meter, so as to transmit the position information from the G7A module 110 to the electric meter;

[0055] One end of the power taking module 130 is connected to the electric meter, and the other end is connected to the G7A module 110, and is used to take power from the electric meter to the G7A module 110;

[0056] One end of the power supply module 140 is connected to the G7A module 110 , and the other end is connected to the signal acquisition module 150 , so as to supply power to the antenna 151 .

[0057] The embodiment of the utility model designs the positioning module separately and installs it inside the electric meter to effectively prevent theft, thereby improving the safety of the positioning module. Specifically, the existing electric meter is divided into two parts by the shell, wherein the inner part includes the electric meter main board, and the outer part includes the communication module and other pluggable devices. The shell is a lead-sealed design, and an opening for the communication module to connect is provided on the shell, which not only ensures the safety of the internal main board but also ensures the connectivity between the internal main board and the external communication module. The positioning module provided by the embodiment of the utility model is fixed on the built-in main board of the electric meter by welding, with the G7A module 110 of the baseband + RF integrated chip and the large antenna 151 of 25x25mm as the main components, and supports the dual-mode positioning of the Beidou Navigation Satellite System (BDS) and the Global Positioning System (GPS), and the antenna 151 can be an active ceramic antenna. In addition, the serial port matching circuit 120 connects the G7A module 110 and the electric meter for transmitting information (the electric meter sends a location acquisition request to the positioning module, and the positioning module pushes back the satellite status, satellite signal strength and location information to the electric meter). The power taking module 130 is also connected to the electric meter and the G7A module 110, and is used to supply power to the G7A module 110 through the electric meter. The signal acquisition module 150 includes an antenna 151, which is connected to the G7A module 110, and can obtain corresponding information based on the instructions given by the G7A module 110, and transmit it back to the G7A module 110. One end of the power supply module 140 is connected to the G7A module 110, and the other end is connected to the signal acquisition module 150, and is used to supply power to the antenna 151.

[0058] As an implementation method, regarding how to connect the positioning module and the electric meter, the positioning module adopts a double-sided patch design and is vertically installed on the built-in mainboard of the electric meter through a 1×5P single-row pin;

[0059] The G7A module 110 adopts an 18-pin design.

[0060] The core processor of the positioning module provided by the embodiment of the utility model adopts the G7A module 110 of baseband + RF integrated chip. The G7A module 110 adopts an 18-pin design, wherein pin 1 is a GND1 pin, pin 2 is a TXD pin, pin 3 is a RXD pin, pin 4 is an 1PPS pin, pin 5 is an EXT_INTO pin, pin 6 is a V_BCXP pin, pin 7 is a VCC_IO pin, pin 8 is a VCC pin, pin 9 is a RESETN pin, pin 10 is a GND2 pin, pin 11 is an RF_IN pin, pin 12 is a GND3 pin, pin 13 is an ANT_ON pin, pin 14 is a VCC_RF pin, pin 15 is an NV1 pin, pin 16 is an SDA pin, pin 17 is an SCL pin, and pin 18 is an NC2 pin. The positioning module equipped with the above-mentioned G7A module 110 is vertically installed on the main board of the electric meter using a 1×5P single-row pin, and a double-sided patch design is used to reduce the module volume. The meter interface adopts a K-dot plastic elevation design to ensure a safe distance and meet the performance test of the meter. Pin 1 of the meter interface is the DDVD (positive digital voltage power) pin, pin 2 corresponds to the RESETN pin of the G7A module 110, pin 3 corresponds to the TXD pin of the G7A module 110, pin 4 corresponds to the RXD pin of the G7A module 110, and pin 5 is the GND pin.

[0061] As an implementation mode, the signal acquisition module 150 is composed of: a signal transmission circuit 152;

[0062] One end of the signal transmission circuit 152 is connected to the pin 11 of the G7A module 110 , and the other end is connected to the antenna 151 .

[0063] Figure 2 This is a schematic diagram of the structure of a signal acquisition module provided by the present invention. Figure 2 As shown, the signal acquisition module 150 includes a signal transmission circuit 152 and an antenna 151. One end of the signal transmission circuit 152 is connected to the 11 pin of the G7A module 110, and the other end is connected to the antenna 151 for signal transmission.

[0064] As an implementation method, how to design the signal transmission circuit 152. Accordingly, the signal transmission circuit 152 includes: a TVS tube, a seventh capacitor, a third resistor, a fifth capacitor and a sixth capacitor;

[0065] The fifth capacitor, the third resistor and the sixth capacitor together form a π-shaped antenna matching network, and one end of the fifth capacitor is connected to the pin 11 of the G7A module 110, and the other end is connected to one end of the seventh capacitor;

[0066] The other end of the seventh capacitor is connected to the TVS tube and the antenna 151 respectively.

[0067] Figure 3 A schematic diagram of a signal transmission circuit provided by an embodiment of the utility model. Figure 3 As shown, after receiving the GNSS satellite signal, the GPS antenna (antenna) is amplified by the internal LNA (low noise amplifier) ​​and sent out, which is received by the signal transmission circuit 152 and sends the GNSS satellite signal to the G7A module 110. The GPS antenna can be connected to the signal transmission circuit 152 by direct welding. The signal transmission circuit 152 includes a TVS tube (F1), a seventh capacitor (C7), a third resistor (R3), a fifth capacitor (C5) and a sixth capacitor (C6). F1 is used to protect sensitive components, C7 is a 330J DC isolation capacitor, C5 and C6 are 200J, R3 is a 0 ohm resistor with a tolerance of 1%, C5, R3 and C6 form a π-shaped antenna matching network, one end of which is connected to the 11 pin of the G7A module 110, and the other end is connected to one end of C7, and the other end of C7 is connected to one end of F1 and the antenna 151. In addition, the other end of C5 not connected to R3 is respectively connected to pins 12 and 10 of G7A, the other end of C6 not connected to R3, and the other end of F1.

[0068] As an implementation method, it is directed to how to connect the signal transmission circuit 152 and the antenna 151. Accordingly, the signal transmission circuit 152 further includes: an antenna connection device;

[0069] The antenna connecting component is arranged at the connecting end of the seventh capacitor and the TVS tube, and is used to connect the antenna 151 and the signal transmission circuit 152 .

[0070] Combination Figure 3 As shown, the antenna 151 can also be connected to the signal transmission circuit 152 through the antenna connector SMA1. Specifically, the connection end of F1 and C7 in the signal transmission circuit 152 is connected to the 1 pin of SMA1, and the 2 pin of SMA is grounded. The antenna 151 is fixed with 3M glue and connected to the male connector on SMA1 through the IPX female connector via the feeder. In this way, after the antenna 151 receives the GNSS satellite signal, it is amplified by the internal LNA and sent out through the feeder, received by the signal transmission circuit 152, and the GNSS satellite signal is sent to the G7A module 110.

[0071] As an implementation method, how to design the serial port matching circuit 120. Accordingly, the serial port matching circuit 120 includes: a fifth resistor, a sixth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, an eighth capacitor, a ninth capacitor and a sixteenth capacitor;

[0072] Pin 2 of the G7A module 110 is connected to pin 3 of the meter interface through the tenth resistor;

[0073] Pin 3 of the G7A module 110 pulls up the sixth resistor, pulls down the sixteenth capacitor, and is connected to pin 4 of the meter interface through the eleventh resistor;

[0074] Pin 9 of the G7A module 110 pulls up the fifth resistor, pulls down the eighth capacitor, and is connected to pin 2 of the electric meter interface through the ninth resistor and the ninth capacitor.

[0075] Figure 4 A schematic diagram of the structure of a serial port matching circuit provided by an embodiment of the utility model. Figure 4 As shown, the serial port matching circuit 120 is divided into three parts, one of which is a matching circuit for the transmit data (TXD) pin, including the tenth resistor (R10), and the 2 pin of the G7A module is directly connected to the 3 pin of the meter interface S1 through R10, which is used to send information to the meter, wherein R10 is a 0J resistor; the second is a matching circuit for the receive data (RXD) pin, including the eleventh resistor (R11), the sixth resistor (R6) and the sixteenth capacitor (C16), the 3 pin of the G7A module is pulled up by the resistor R6 and the pull-down capacitor C16, and the 4 pin of S1 is connected by R11. The pin is connected for receiving information, wherein R11 is 0J, R6 is 103J, and C16 is 330J; the third is a matching circuit for the reset (RESETN) pin, including a fifth resistor (R5), a ninth resistor (R9), a tenth resistor (R10), an eighth capacitor (C8), and a ninth capacitor (C9), the 9-pin pull-up resistor R5 and the pull-down capacitor C8 of the G7A module 110 are connected to the 2-pin of S1 through the resistor R9 and the pull-down capacitor C9, wherein R5 is 103J, R9 is 0J, C8 is 330J, and C9 is 100J.

[0076] As an implementation method, it is directed to how to design the power taking module 130. Accordingly, the power taking module 130 includes: a second capacitor, a third capacitor and a fourth capacitor;

[0077] The second capacitor, the third capacitor and the fourth capacitor are connected in parallel, and one end is connected to the electric meter and the 7th pin of the G7A module 110 respectively, and the other end is grounded;

[0078] The second capacitor is used for anti-interference, the third capacitor is used for energy storage, and the fourth capacitor is used for filtering.

[0079] Figure 5 A schematic diagram of the structure of a power supply module provided in an embodiment of the utility model. Figure 5As shown, the power taking module 130 includes a second capacitor (C2), a third capacitor (C3) and a fourth capacitor (C4) connected in parallel, one end of which is connected to the 7th pin and the 8th pin of the electric meter and the G7A module 110 respectively, and the other end is grounded. C2 is 330J for realizing the anti-interference function, C3 is 223M for realizing the energy storage function, and C4 is 104K for realizing the filtering function.

[0080] As an implementation method, it is directed to how to design the power supply module 140. Accordingly, the power supply module 140 includes: a second resistor, a first capacitor, and a first inductor;

[0081] One end of the second resistor is connected to the pin 14 of the G7A module 110 , and the other end pulls down the first capacitor and is connected to the signal acquisition module 150 through the first inductor.

[0082] Figure 6 A schematic diagram of the structure of a power supply module provided by an embodiment of the utility model. Figure 6 As shown, the power supply module 140 includes a second resistor (R2), a first capacitor (C1) and a first inductor (L1), wherein one end of R2 is connected to pin 14 of the G7A module 110, and the other end pulls down C1 and is connected to one end of L1. The other end of L1 is connected to the connection end of C7 and F1. The model of R2 is 0200F, C1 is 330J, and L1 completes the feeding of the antenna 151 through the signal line.

[0083] As an implementation method, it is aimed at how to ensure the stability of power supply for the antenna 151. Accordingly, the positioning module further includes: a power supply module 160;

[0084] One end of the power module 160 is connected to pin 2 of the electric meter interface, and the other end is connected to the connection end of the first inductor and the second resistor, so as to supply power to the antenna 151 .

[0085] In order to ensure the stability of power supply to the antenna 151, the embodiment of the utility model provides a method of powering it through a power module 160. The power module 160 adopts an LDO power supply circuit design, so that the entire positioning module can choose to use direct power supply from the meter or use an LDO power supply circuit according to the application scenario. Specifically, one end of the power module 160 is connected to the 2nd pin of the meter interface, that is, the reset pin, and the other end is connected to the connection section of the first inductor and the second resistor, which is used to power the antenna 151. The LDO power supply circuit requires that when the 2nd pin of the meter interface S1 outputs a low level, the power module 160 is turned off and the meter is directly powered; when the 2nd pin of the meter interface S1 outputs a high level, the power module 160 is turned on and the power module 160 supplies power to the antenna 151.

[0086] As an implementation method, it is directed to how to design the structure of the power module 160. Accordingly, the power module 160 includes: a control module and a power submodule;

[0087] The control module is used to control the switch of the power submodule, including an eighth resistor, a twelfth resistor, a first transistor and a seventh resistor;

[0088] The power submodule is used to supply power to the antenna 151, and includes an LDO chip, a first resistor, a fourth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor;

[0089] One end of the eighth resistor is connected to pin 2 of the meter interface, and the other end pulls down the twelfth resistor and is connected to the base of the first transistor; the emitter of the first transistor is connected to the other end of the twelfth resistor, and the collector is respectively connected to one end of the seventh resistor and pin 3 of the LDO chip;

[0090] Pin 1 of the LDO chip is respectively connected to the other end of the seventh resistor, the pull-down tenth capacitor, and one end of the first resistor;

[0091] Pin 5 of the LDO chip is respectively connected to the other end of the first resistor, one end of the eleventh capacitor, the twelfth capacitor and the thirteenth capacitor connected in parallel, and one end of the fourth resistor;

[0092] The fourth resistor is connected to a connection terminal of the first inductor and the second resistor.

[0093] Figure 7 A schematic diagram of the structure of a power module provided by an embodiment of the utility model. Figure 7As shown, the power module 160 uses the LDO chip (U2) as the main component, including a control module and a power submodule. Pin 1 of the LDO is the Vin pin, pin 2 is the GND pin, pin 3 is the EN pin, pin 4 is the NC pin, and pin 5 is the Vout pin. The control module is composed of the eighth resistor (R8), the twelfth resistor (R12), the first transistor (D1) and the seventh resistor (R7). One end of R8 is connected to pin 2 of the meter interface S1, and the other end is a pull-down resistor R12 and connected to the base of D1; the emitter of D1 is led back to the other end of R12, and the collector is connected to one end of R7. R8 is 472J, R12 is 103J, D1 can be a commonly used NPN silicon transistor, and R7 is 103J. The connection end of R7 and D1 is connected to pin 3 of U2. The power submodule includes an LDO chip (U2), a first resistor (R1), a fourth resistor (R4), a tenth capacitor (C10), an eleventh capacitor (C11), a twelfth capacitor (C12) and a thirteenth capacitor (C13). One end of C10 is grounded, and the other end is connected to a digital power supply voltage (DVDD). The connection section between C10 and DVDD is connected to the other end of R7 and connected to pin 1 of U2, wherein C10 is 105K. One end of R4 is connected to pin 5 of U2, and the other end is connected to the connection line between R2 and L1, wherein R4 is 0J. C11, C12 and C13 are connected in parallel to the connection line between R4 and pin 5 of U2, and one end of C11, C12 and C13 is connected to a 3V3 voltage, and the other end is grounded. C11 is 105K, C12 is 101K, and C13 is 330J. One end of the NC resistor R1 is connected to pin 1 of U2, and the other end is connected to pin 5 of U2 for possible future modifications or upgrades. In this way, the control module determines the switch of the power submodule according to the level of the output of the 2-pin of the meter interface S1. When the 2-pin of S1 outputs a low level, the control module turns off the power submodule, and the antenna 151 is directly powered by the meter. When the 2-pin of S1 outputs a high level, the control module turns on the power submodule, and the power submodule supplies power to the antenna 151, thereby improving the power supply stability.

[0094] As an implementation method, regarding how to debug, correspondingly, a wire is used to connect the 4 pins of the F7A module and the 2 pins of the debugging interface.

[0095] In the embodiment provided by the utility model, the debugging interface S2 includes five pins, wherein pin 1 is connected to 3V3 voltage, pin 2 is IPPS pin, pin 3 corresponds to TXD pin of G7A module 110, pin 4 corresponds to RXD pin of G7A module 110, and pin 5 is grounded. When debugging is required, pin 2 of S2 is connected to pin 4 of G7A module 110, pin 3 is connected to pin 2 of G7A module 110, and pin 4 is connected to pin 3 of G7A module 110 through a wire.

[0096] Figure 8 A schematic diagram of the circuit connection of a positioning module provided by an embodiment of the utility model. Figure 8 As shown, the positioning module may include a G7A module, a serial port matching circuit, a power supply module, a power supply module, a power supply module and a signal acquisition module. The components of each module are the same as those described above. The antenna actively acquires information such as satellite status, signal strength and position at regular intervals or according to real-time instructions, and sends it to the G7A module through a signal transmission circuit, which is fed back to the meter by the G7A module through a serial port matching circuit. The power supply of the antenna can be achieved by a power supply module or a power supply module in combination with a power supply module. Specifically, when the 2-pin output of the meter interface S1 is low, the control module of the power supply module turns off the power submodule, and the power supply module draws power from the meter and powers the antenna through the power supply module; when the 2-pin output of S1 is high, the control module of the power supply module turns on the power submodule, and the power submodule powers the antenna, thereby improving the stability of the power supply.

[0097] In summary, the built-in positioning module of an electric energy meter provided by the embodiment of the utility model is welded on the built-in mainboard of the electric energy meter, including: a G7A module, an electric energy meter interface circuit, a power supply module, a power supply module and a signal acquisition module; the signal acquisition module includes: an antenna; one end of the electric energy meter interface circuit is connected to the G7A module, and the other end is connected to the electric energy meter, for transmitting satellite signals from the G7A module to the electric energy meter; one end of the power supply module is connected to the electric energy meter, and the other end is connected to the G7A module, for drawing power from the electric energy meter to the G7A module; the signal acquisition module is connected to the G7A module, for sending the acquired satellite signal to the G7A module; one end of the power supply module is connected to the G7A module, and the other end is connected to the signal acquisition module, for powering the antenna. In this way, the positioning module is designed separately and installed inside the electric energy meter for effective theft prevention, thereby improving the safety of the positioning module.

[0098] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A built-in positioning module for an electric energy meter, characterized in that: The positioning module is welded on the built-in mainboard of the electric meter, and includes: a G7A module, a serial port matching circuit, a power taking module, a power supply module and a signal acquisition module; the signal acquisition module includes: an antenna; The signal acquisition module is connected to the G7A module, and is used to acquire the position information through the antenna and send the position information to the G7A module; One end of the serial port matching circuit is connected to the G7A module, and the other end is connected to the electric meter, so as to transmit the position information from the G7A module to the electric meter; One end of the power taking module is connected to the electric meter, and the other end is connected to the G7A module, and is used to take power from the electric meter to the G7A module; One end of the power supply module is connected to the G7A module, and the other end is connected to the signal acquisition module, so as to supply power to the antenna.

2. The built-in positioning module of the electric energy meter according to claim 1, characterized in that: The positioning module adopts a double-sided patch design and is vertically installed on the built-in mainboard of the electric meter through a 1×5P single-row needle; The G7A module adopts an 18-pin design.

3. The built-in positioning module of the electric energy meter according to claim 2, characterized in that: The signal acquisition module includes: a signal transmission circuit; One end of the signal transmission circuit is connected to pin 11 of the G7A module, and the other end is connected to the antenna.

4. The built-in positioning module of the electric energy meter according to claim 3, characterized in that: The signal transmission circuit comprises: a TVS tube, a seventh capacitor, a third resistor, a fifth capacitor and a sixth capacitor; The fifth capacitor, the third resistor and the sixth capacitor together form a π-shaped antenna matching network, and one end of the fifth capacitor is connected to the 11 pin of the G7A module, and the other end is connected to one end of the seventh capacitor; The other end of the seventh capacitor is connected to the TVS tube and the antenna respectively.

5. The built-in positioning module of the electric energy meter according to claim 4, characterized in that: The signal transmission circuit further includes: an antenna connection device; The antenna connecting component is arranged at the connecting end of the seventh capacitor and the TVS tube, and is used to connect the antenna and the signal transmission circuit.

6. The built-in positioning module of the electric energy meter according to claim 2, characterized in that: The serial port matching circuit comprises: a fifth resistor, a sixth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, an eighth capacitor, a ninth capacitor and a sixteenth capacitor; Pin 2 of the G7A module is connected to pin 3 of the meter interface through the tenth resistor; Pin 3 of the G7A module pulls up the sixth resistor, pulls down the sixteenth capacitor, and is connected to pin 4 of the meter interface through the eleventh resistor; Pin 9 of the G7A module pulls up the fifth resistor, pulls down the eighth capacitor, and is connected to pin 2 of the meter interface through the ninth resistor and the ninth capacitor.

7. The built-in positioning module of the electric energy meter according to claim 2, characterized in that: The power taking module includes: a second capacitor, a third capacitor and a fourth capacitor; The second capacitor, the third capacitor and the fourth capacitor are connected in parallel, and one end of each capacitor is connected to the electric meter and the 7-pin of the G7A module respectively, and the other end of each capacitor is grounded; The second capacitor is used for anti-interference, the third capacitor is used for energy storage, and the fourth capacitor is used for filtering.

8. The built-in positioning module of the electric energy meter according to claim 2, characterized in that: The power supply module comprises: a second resistor, a first capacitor and a first inductor; One end of the second resistor is connected to pin 14 of the G7A module, and the other end pulls down the first capacitor and is connected to the signal acquisition module through the first inductor.

9. The built-in positioning module of the electric energy meter according to claim 8, characterized in that: The positioning module further includes: a power supply module; One end of the power module is connected to pin 2 of the electric meter interface, and the other end is connected to the connection end of the first inductor and the second resistor, so as to supply power to the antenna.

10. The built-in positioning module of the electric energy meter according to claim 9, characterized in that: The power module comprises: a control module and a power submodule; The control module is used to control the switch of the power submodule, including an eighth resistor, a twelfth resistor, a first transistor and a seventh resistor; The power submodule is used to power the antenna, and includes an LDO chip, a first resistor, a fourth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor; One end of the eighth resistor is connected to pin 2 of the meter interface, and the other end pulls down the twelfth resistor and is connected to the base of the first transistor; the emitter of the first transistor is connected to the other end of the twelfth resistor, and the collector is respectively connected to one end of the seventh resistor and pin 3 of the LDO chip; Pin 1 of the LDO chip is respectively connected to the other end of the seventh resistor, the pull-down tenth capacitor, and one end of the first resistor; Pin 5 of the LDO chip is respectively connected to the other end of the first resistor, one end of the eleventh capacitor, the twelfth capacitor and the thirteenth capacitor connected in parallel, and one end of the fourth resistor; The fourth resistor is connected to a connection terminal of the first inductor and the second resistor.

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