PCB mainboard and intelligent electric meter

Abstract

The utility model provides a PCB mainboard and an intelligent electric meter. The intelligent electric meter comprises a control chip; the PCB mainboard is provided with a zero line, a live line and a detection circuit. The detection circuit comprises an induction antenna, a first resistor, a second resistor and a third resistor; the first end of the first resistor is connected with the control chip, and the second end is connected with the first pin of the induction antenna. The first end of the second resistor is connected with the second pin of the induction antenna. The second end of the second resistor and the first end of the third resistor are connected with the control chip; the second end of the third resistor is grounded; the first resistor, the second resistor and the third resistor form a voltage division circuit. In the mode, the detection circuit comprising the induction antenna is arranged on the PCB mainboard, and whether the zero line and the live line of the intelligent electric meter are reversely connected is judged by detecting the induction voltage of the induction antenna, so that the detection circuit can be better integrated in the intelligent electric meter on the basis of reducing the complexity and the energy consumption of the structure of the detection circuit; and the cost of the intelligent ammeter is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of smart electric meters, in particular to a PCB mainboard and a smart electric meter. Background Art

[0002] With the rapid development and popular application of smart meters, smart meters have brought great convenience to the electricity consumption, statistics and monitoring of residents and enterprises. When the smart meter is connected to the electricity terminal, due to the influence of factors such as operation and construction, the neutral wire and the live wire may be connected reversely, and electric shock accidents are likely to occur during reverse connection. The existing reverse connection detection circuit of the neutral wire and the live wire measures the voltage difference between the power supply bus and compares the voltage difference with the preset threshold to determine whether the neutral wire and the live wire are reversed. The circuit structure and process are relatively complex, with high energy consumption and high cost, and it cannot be well integrated into the smart meter for use. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a PCB mainboard and a smart meter, which can better integrate the detection circuit into the smart meter on the basis of reducing the complexity and energy consumption of the detection circuit structure, thereby reducing the cost of the smart meter.

[0004] In a first aspect, an embodiment of the utility model provides a PCB mainboard (Printed Circuit Board), which is applied to a smart meter, and the smart meter includes a control chip; a neutral wire, a live wire and a detection circuit are arranged on the PCB mainboard; the detection circuit includes an induction antenna, a first resistor, a second resistor and a third resistor; the first end of the first resistor is connected to the control chip, and the second end is connected to pin 1 of the induction antenna; the first end of the second resistor is connected to pin 2 of the induction antenna; the second end of the second resistor and the first end of the third resistor are both connected to the control chip; the second end of the third resistor is grounded; the first resistor, the second resistor and the third resistor form a voltage divider circuit, and the voltage divider circuit is used to divide the induction voltage of the induction antenna collected by the control chip so that the amplitude of the divided induction voltage is within a preset amplitude range; the induction antenna is used to generate an induction voltage when the PCB mainboard is turned on; the control chip is used to determine whether the neutral wire and the live wire are reversed according to the induction voltage.

[0005] Furthermore, the detection circuit also includes a first capacitor; the first capacitor is connected in parallel with the third resistor.

[0006] Furthermore, copper wires are laid on the PCB main board; the inductive antenna is connected to the copper wires; the detection circuit and the copper wires form a loop; the inductive antenna is used to generate a high level when the copper wires are conductive; and to generate a low level when the copper wires are not conductive.

[0007] Furthermore, the copper wire is an uninterrupted copper wire.

[0008] Furthermore, the sensing antenna is a pin.

[0009] In a second aspect, an embodiment of the utility model provides a smart meter, comprising: a PCB mainboard of any of the above items, and also comprising: a control chip; the PCB mainboard is arranged at the bottom of the smart meter; a detection circuit is arranged on the PCB mainboard; a GPIO (General Purpose Input Output) port of the control chip is connected to a first end of a first resistor of the detection circuit; an AD sampling port of the control chip is respectively connected to a second end of a second resistor and a first end of a third resistor of the detection circuit; the control chip is used to collect an induced voltage from the GPIO port, and determine whether the induced voltage is a high level, and if so, determine that the smart meter has no electricity theft behavior; collect a preset number of induced voltages from the AD (Analog-Digital) sampling port at a preset time interval, and determine whether the average value of the induced voltage is greater than a preset voltage value, and if so, determine that the neutral wire and the live wire of the smart meter are not reversed.

[0010] Furthermore, the smart meter also includes an alarm module; the alarm module is connected to the control chip; the alarm module is arranged on the PCB main board; the control chip is also used to generate a first alarm signal when the smart meter steals electricity, and send the first alarm signal to the alarm module; when the neutral wire and the live wire of the smart meter are reversed, a second alarm signal is generated, and the second alarm signal is sent to the alarm module; the alarm module is used to alarm according to the first alarm signal or the second alarm signal.

[0011] Furthermore, the alarm module is an alarm light.

[0012] Furthermore, the alarm module is a buzzer.

[0013] Furthermore, the smart electric meter also includes a display module; the display module is connected to the control chip.

[0014] The utility model provides a PCB mainboard and a smart meter, the smart meter comprising a control chip; a neutral line, a live line and a detection circuit are arranged on the PCB mainboard; the detection circuit comprises an induction antenna, a first resistor, a second resistor and a third resistor; a first end of the first resistor is connected to the control chip, and a second end is connected to pin 1 of the induction antenna; a first end of the second resistor is connected to pin 2 of the induction antenna; a second end of the second resistor and a first end of the third resistor are both connected to the control chip; a second end of the third resistor is grounded; the first resistor, the second resistor and the third resistor form a voltage divider circuit, the voltage divider circuit is used to divide the induction voltage of the induction antenna collected by the control chip, so that the amplitude of the divided induction voltage is within a preset amplitude range; the induction antenna is used to generate an induction voltage when the PCB mainboard is turned on; the control chip is used to judge whether the neutral line and the live line are reversely connected according to the induction voltage. In this method, a detection circuit including an induction antenna is arranged on the PCB main board, and the method of judging whether the neutral wire and the live wire of the smart meter are reversely connected is performed by detecting the induced voltage of the induction antenna. On the basis of reducing the complexity and energy consumption of the detection circuit structure, the detection circuit can be better integrated into the smart meter, thereby reducing the cost of the smart meter.

[0015] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a detection circuit provided in Embodiment 1 of the present utility model;

[0019] Figure 2 A schematic diagram of a PCB mainboard provided in Embodiment 1 of the present utility model;

[0020] Figure 3 A schematic diagram of laying copper wires on a PCB mainboard provided in the first embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the smart electric meter provided in the second embodiment of the utility model.

[0022] Icon: 1-PCB mainboard; 2-detection circuit; 3-copper wire; 4-control chip; 5-alarm module; 6-display module; key-sensing antenna; R1-first resistor; R2-second resistor; R3-third resistor; C1-first capacitor. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0024] To facilitate understanding of this embodiment, the embodiment of the utility model is described in detail below.

[0025] Embodiment 1:

[0026] Figure 1 This is a schematic diagram of a detection circuit provided in Embodiment 1 of the present utility model.

[0027] Figure 2 This is a schematic diagram of a PCB mainboard provided in Embodiment 1 of the present utility model.

[0028] The PCB main board 1 is applied to a smart meter, which includes a control chip 4. Figure 2 , a neutral line, a live line and a detection circuit 2 are arranged on the PCB main board 1. Figure 1 , the detection circuit 2 includes an induction antenna key, a first resistor R1, a second resistor R2 and a third resistor R3.

[0029] Here, the sensing antenna key is a pin, and the pin is vertically inserted on the PCB main board.

[0030] The first end of the first resistor R1 is connected to the control chip 4, and the second end is connected to pin 1 of the sensing antenna key; the first end of the second resistor R2 is connected to pin 2 of the sensing antenna key; the second end of the second resistor R2 and the first end of the third resistor R3 are both connected to the control chip 4; the second end of the third resistor R3 is grounded.

[0031] The first resistor R1, the second resistor R2 and the third resistor R3 form a voltage divider circuit, which is used to divide the induced voltage of the sensing antenna key collected by the control chip 4 so that the amplitude of the divided induced voltage is within a preset amplitude range.

[0032] Here, the preset amplitude range is preset according to actual experimental data.

[0033] The first resistor R1 is used for overcurrent protection to prevent an external large current from damaging the interface of the control chip 4 connected to the first resistor R1.

[0034] The second resistor R2 is used for overcurrent protection to prevent an external large current from damaging the interface of the control chip 4 connected to the second resistor R2.

[0035] In one embodiment, referring to Figure 1 , the detection circuit 2 also includes a first capacitor C1; the first capacitor C1 is connected in parallel with the third resistor R3.

[0036] Here, two ends of the first capacitor C1 are connected to two ends of the third resistor R3 respectively. The first capacitor C1 and the third resistor R3 are connected in parallel to form a voltage divider circuit, which divides the induced voltage sensed by the sensing antenna key so that the control chip 4 can measure the induced voltage.

[0037] The induction antenna key is used to generate an induction voltage when the PCB main board 1 is turned on.

[0038] The control chip 4 is used to determine whether the neutral line and the live line are reversely connected according to the induced voltage.

[0039] Here, the control chip 4 collects a preset number of induced voltages at a preset time interval, and determines whether the average value of the induced voltage is greater than the preset voltage value. If so, it is determined that the neutral wire and the live wire of the smart meter are positively connected; if not, it is determined that the neutral wire and the live wire of the smart meter are reversely connected.

[0040] The preset time interval and the preset number can be set according to actual conditions. The preset time interval can be 1ms, and the preset number can be 128.

[0041] The preset voltage value is pre-set through experiments. Different voltages, frequencies and control chips 4 of the electric meter are pre-set in the experiment. The voltage can be 240V, 230V and 220V, etc., the frequency can be 50HZ and 60HZ, etc., and the control model can be a variety of commonly used chip models of electric meters. The voltage, frequency and chip model are combined to form a variety of circuits with positive connection of the neutral line and the live line, and a detection circuit 2 is provided in each circuit. The control chip 4 continuously collects a preset number of measurements (which can be 512) of experimental induced voltages at a preset time interval. The experimental induced voltage here is the induced voltage on the induction antenna key when the neutral line and the live line are positively connected. The average value of the experimental induced voltage of the preset measurement data is calculated, and the average value of the experimental induced voltage is determined to be the preset voltage value. The corresponding relationship between the voltage, frequency and chip model and the preset voltage value are matched, so that the smart meter can select the corresponding preset voltage value according to the actual voltage, actual frequency and actual signal of the control chip 4.

[0042] In one embodiment, referring to Figure 2 and Figure 3 , a copper wire 3 is laid on the PCB main board; the sensing antenna key is connected to the copper wire 3; the detection circuit 2 and the copper wire 3 form a loop.

[0043] Here, the copper wire 3 is an uninterrupted copper wire 3 .

[0044] The induction antenna key is used to generate a high level when the copper wire 3 is conductive, and to generate a low level when the copper wire 3 is not conductive.

[0045] Here, because the PCB main board 1 is a circuit board covered with zigzag traces, and the PCB main board 1 is set at the bottom of the smart meter, when someone pries the bottom of the smart meter, the zigzag copper wire 3 will be disconnected. When the copper wire 3 is normally connected, the control chip 4 detects a high level. When the copper wire 3 is disconnected, the control chip 4 detects a low level, and determines that the smart meter has stolen electricity.

[0046] The utility model provides a PCB mainboard, which is applied to a smart meter. The smart meter includes a control chip; a neutral line, a live line and a detection circuit are arranged on the PCB mainboard; the detection circuit includes an induction antenna, a first resistor, a second resistor and a third resistor; a first end of the first resistor is connected to the control chip, and a second end is connected to pin 1 of the induction antenna; a first end of the second resistor is connected to pin 2 of the induction antenna; a second end of the second resistor and a first end of the third resistor are both connected to the control chip; a second end of the third resistor is grounded; the first resistor, the second resistor and the third resistor form a voltage divider circuit, which is used to divide the induction voltage of the induction antenna collected by the control chip so that the amplitude of the divided induction voltage is within a preset amplitude range; the induction antenna is used to generate an induction voltage when the PCB mainboard is turned on; and the control chip is used to judge whether the neutral line and the live line are reversely connected according to the induction voltage. In this method, a detection circuit including an induction antenna is set on the PCB main board, and the method of judging whether the neutral line and the live line of the smart meter are reversely connected by detecting the induced voltage of the induction antenna can better integrate the detection circuit into the smart meter on the basis of reducing the complexity and energy consumption of the detection circuit structure, thereby reducing the cost of the smart meter. At the same time, a copper wire loop is set on the PCB main board, and the electrical level of the induction antenna can be detected to judge whether the smart meter has electricity theft, which can protect the rights and interests of the power supply company.

[0047] Embodiment 2:

[0048] Figure 4 This is a schematic diagram of the smart electric meter provided in the second embodiment of the utility model.

[0049] Reference Figure 4 , a smart electric meter includes: the above-mentioned PCB main board 1, and also includes: a control chip 4; the PCB main board 1 is arranged at the bottom of the smart electric meter; a detection circuit 2 is arranged on the PCB main board 1; the GPIO port of the control chip 4 is connected to the first end of the first resistor of the detection circuit 2; the AD sampling port of the control chip 4 is respectively connected to the second end of the second resistor and the first end of the third resistor of the detection circuit 2.

[0050] The control chip 4 is used to collect the induced voltage of the GPIO port and determine whether the induced voltage is at a high level. If so, it is determined that the smart meter has no electricity theft behavior; a preset number of induced voltages are collected from the AD sampling port at a preset time interval, and it is determined whether the average value of the induced voltage is greater than a preset voltage value. If so, it is determined that the neutral wire and the live wire of the smart meter are not reversed.

[0051] Here, the control chip 4 collects the induced voltage of the GPIO port. If the induced voltage at the GPIO port is high, it is determined that the smart meter does not steal electricity. If the induced voltage at the GPIO port is low, it is determined that there is a disconnection in the copper wire on the PCB mainboard 1, and it is determined that the smart meter steals electricity.

[0052] The control chip 4 collects a preset number of induced voltages from the AD sampling port at a preset time interval, and determines whether the average value of the induced voltage at the AD sampling port is greater than a preset voltage value. If yes, it is determined that the neutral line and the live line of the smart meter are positively connected. If not, it is determined that the neutral line and the live line of the smart meter are reversely connected.

[0053] In one embodiment, referring to Figure 4 The smart meter also includes an alarm module 5 ; the alarm module 5 is connected to the control chip 4 ; the alarm module 5 is arranged on the PCB main board 1 .

[0054] The control chip 4 is also used to generate a first alarm signal when the smart meter steals electricity and send the first alarm signal to the alarm module 5; when the neutral wire and the live wire of the smart meter are reversed, generate a second alarm signal and send the second alarm signal to the alarm module 5.

[0055] The alarm module 5 is used for generating an alarm according to the first alarm signal or the second alarm signal.

[0056] Here, the alarm module 5 can give an audible or visual alarm according to the alarm signal.

[0057] The alarm module 5 may be one or more of an alarm light and a buzzer.

[0058] When the control chip 4 determines that there is electricity theft in the smart meter, a first alarm signal is generated, and the alarm module 5 controls the alarm light or buzzer to alarm in a first preset alarm mode according to the first alarm signal.

[0059] When the control chip 4 determines that the neutral line and the live line of the smart meter are reversely connected, a second alarm signal is generated, and the alarm module 5 controls the alarm light or buzzer to alarm in a second preset alarm mode according to the second alarm signal.

[0060] The first preset alarm mode and the second preset alarm mode may be the same or different. If the first preset alarm mode is different from the second preset alarm mode, the user can determine the fault type of the smart meter according to the different alarm modes.

[0061] In one embodiment, referring to Figure 4 The smart meter also includes a display module 6 ; the display module 6 is connected to the control chip 4 .

[0062] Here, the display module 6 is used to display the working status of the smart meter.

[0063] Specifically, when there is no electricity theft in the smart meter and the neutral and live wires are connected correctly, the display module displays "Normal". When there is electricity theft in the smart meter, but the neutral and live wires are connected correctly, the display module displays "Electricity theft, positive connection". When there is no electricity theft in the smart meter and the neutral and live wires are connected reversely, the display module displays "Reverse connection". When there is electricity theft in the smart meter and the neutral and live wires are connected reversely, the display module displays "Electricity theft, reverse connection".

[0064] The embodiment of the utility model provides a smart meter, in which a PCB mainboard including a detection circuit is provided at the bottom of the smart meter, and a method of determining whether the neutral line and the live line of the smart meter are reversely connected by detecting the induced voltage of the induction antenna can better integrate the detection circuit into the smart meter on the basis of reducing the complexity and energy consumption of the detection circuit structure, thereby reducing the cost of the smart meter. At the same time, a copper wire loop is provided on the PCB mainboard, and the level of the induction antenna can be detected to determine whether the smart meter has electricity theft, thereby protecting the rights and interests of the power supply company.

[0065] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0066] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the utility model can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the utility model. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0068] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0069] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A PCB motherboard, characterized in that: Applied to a smart meter, the smart meter includes a control chip; a neutral line, a live line and a detection circuit are arranged on the PCB main board; the detection circuit includes an induction antenna, a first resistor, a second resistor and a third resistor; The first end of the first resistor is connected to the control chip, and the second end is connected to pin 1 of the sensing antenna; the first end of the second resistor is connected to pin 2 of the sensing antenna; the second end of the second resistor and the first end of the third resistor are both connected to the control chip; the second end of the third resistor is grounded; The first resistor, the second resistor and the third resistor form a voltage divider circuit, and the voltage divider circuit is used to divide the induced voltage of the induction antenna collected by the control chip so that the amplitude of the divided induced voltage is within a preset amplitude range; The induction antenna is used to generate the induction voltage when the PCB mainboard is turned on; The control chip is used to determine whether the neutral wire and the live wire are reversely connected according to the induced voltage.

2. The PCB mainboard according to claim 1, characterized in that: The detection circuit also includes a first capacitor; the first capacitor is connected in parallel with the third resistor.

3. The PCB mainboard according to claim 1, characterized in that: The PCB mainboard is provided with a copper wire; the induction antenna is connected to the copper wire; the detection circuit and the copper wire form a loop; The inductive antenna is used to generate a high level when the copper wire is conductive, and to generate a low level when the copper wire is not conductive.

4. The PCB mainboard according to claim 3, characterized in that: The copper wire is an uninterrupted copper wire.

5. The PCB mainboard according to claim 1, characterized in that: The induction antenna is a pin.

6. A smart electric meter, characterized in that: include: The PCB mainboard as described in any one of claims 1 to 5 above further comprises: a control chip; the PCB mainboard is arranged at the bottom of the smart meter; The PCB mainboard is provided with a detection circuit; the GPIO port of the control chip is connected to the first end of the first resistor of the detection circuit; the AD sampling port of the control chip is respectively connected to the second end of the second resistor and the first end of the third resistor of the detection circuit; The control chip is used to collect the induced voltage of the GPIO port, determine whether the induced voltage is at a high level, and if so, determine that the smart meter has no electricity theft behavior; collect a preset number of the induced voltages from the AD sampling port at a preset time interval, determine whether the average value of the induced voltage is greater than a preset voltage value, and if so, determine that the neutral wire and the live wire of the smart meter are not reversed.

7. The smart electric meter according to claim 6, characterized in that: The smart meter also includes an alarm module; the alarm module is connected to the control chip; the alarm module is arranged on the PCB main board; The control chip is further used to generate a first alarm signal when the smart meter has the electricity theft behavior, and send the first alarm signal to the alarm module; when the neutral wire and the live wire of the smart meter are reversely connected, generate a second alarm signal, and send the second alarm signal to the alarm module; The alarm module is used to generate an alarm according to the first alarm signal or the second alarm signal.

8. The smart electric meter according to claim 7, characterized in that: The alarm module is an alarm light.

9. The smart electric meter according to claim 7, characterized in that: The alarm module is a buzzer.

10. The smart electric meter according to claim 6, characterized in that: The smart electric meter also includes a display module; the display module is connected to the control chip.

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