Meter and meter power consumption detection method

Abstract

The application discloses a meter and a meter power consumption detection method. The meter is provided with a sampling resistor to collect the power supply loop voltage of an electric module, and a control unit is used to calculate the power consumption of the electric module according to the sampling voltage, so that the power consumption self-checking of the meter in use is realized, and the user can replace or repair the power supply battery or the meter in time according to the power consumption of the electric module, thereby guaranteeing the normal use of the user. Since the working current of the electric module in the static working state is far less than the working current in the dynamic working state, the electric module becomes the dynamic working state when the power consumption self-checking is performed. An energy storage circuit is arranged at the back end of the sampling resistor, the energy storage circuit is used to absorb the current in the dynamic working state, the sampling resistor collects the voltage value balanced by the energy storage circuit, the accuracy of the static sampling is improved, and the accuracy of the meter power consumption detection is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of meter, in particular to a meter and a meter power consumption detection method. BACKGROUND

[0002] With the rapid development of metering technology, intelligent meter technology is rapidly developing, and intelligent meters (such as intelligent gas meters, intelligent water meters, etc.) with functions such as prepayment, remote control, remote meter reading, and low power consumption have been widely used in homes, enterprises, etc. Intelligent meters are generally powered by alkaline batteries or lithium batteries, and the power consumption of the meter determines the service life of the battery.

[0003] In the prior art, the power consumption of the meter is tested before the meter is assembled, and the service life of the battery is predicted according to the power consumption of the meter. However, during the use of the meter, the power consumption of the meter may be higher due to material aging, external force, moisture, etc., ultimately resulting in a service life of the battery that does not meet the originally predicted period, and the user cannot know the power consumption of the meter, resulting in the inability to replace or repair in time, ultimately affecting the normal use of water or gas by the user. SUMMARY

[0004] In order to solve the problem of not being able to know the power consumption of the meter in the actual use process, the present application provides a meter capable of detecting its own power consumption and a meter power consumption detection method.

[0005] According to an aspect of an embodiment of the present application, a meter is disclosed, the meter comprising a meter body, a sampling resistor, and an energy storage circuit, wherein the meter body comprises a shell and a power consumption module arranged in the shell, the shell is provided with a first connection end and a second connection end for connecting one end of a power supply battery respectively, the power consumption module is connected to the first connection end, and the power consumption module comprises a control unit; a first end of the sampling resistor is connected to the second connection end, and a second end of the sampling resistor is connected to the power consumption module, and the control unit is used to calculate the power consumption of the power consumption module according to a sampling signal of the sampling resistor; a first end of the energy storage circuit is connected to the first connection end, and a second end of the energy storage circuit is connected to a junction of the second end of the sampling resistor and the power consumption module, and the energy storage circuit is used to absorb the current of a loop formed by the power consumption module, the sampling resistor, and the power supply battery or discharge the loop.

[0006] In an exemplary embodiment, the meter further comprises a power supply battery arranged in the shell, one end of the power supply battery is connected to the first connection end, and the other end is connected to the second connection end, for supplying power to the power consumption module.

[0007] In an exemplary embodiment, the positive pole of the power supply battery is connected to the first connection end, and the negative pole of the power supply battery is connected to the second connection end.

[0008] In an exemplary embodiment, the energy storage circuit comprises an energy storage capacitor, the positive pole of the energy storage capacitor is connected to the first connection end, and the negative pole of the energy storage capacitor is connected to the second end of the sampling resistor and grounded.

[0009] In an exemplary embodiment, the meter further comprises a differential amplification circuit, two input ends of the differential amplification circuit are respectively connected to the first end and the second end of the sampling resistor, the output end of the differential amplification circuit is connected to the control unit, and the differential amplification circuit is used to amplify and output the sampling signal of the sampling resistor to the control unit.

[0010] In an exemplary embodiment, the differential amplification circuit comprises a primary amplification circuit and a secondary amplification circuit, two input ends of the primary amplification circuit are respectively connected to the first end and the second end of the sampling resistor, one input end of the secondary amplification circuit is connected to the output end of the primary amplification circuit, the other input end of the secondary amplification circuit is grounded, and the output end of the secondary amplification circuit is connected to the control unit.

[0011] In an exemplary embodiment, the primary amplification circuit comprises a first differential amplifier, a first adjusting resistor, a second adjusting resistor, a third adjusting resistor, and a fourth adjusting resistor; the output end of the first differential amplifier is connected to the input end of the secondary amplification circuit; the first adjusting resistor is connected between the non-inverting input end of the first differential amplifier and the second end of the sampling resistor; the second adjusting resistor is connected between the inverting input end of the first differential amplifier and the first end of the sampling resistor; one end of the third adjusting resistor is connected to the non-inverting input end of the first differential amplifier, and the other end is grounded; and the fourth adjusting resistor is connected between the output end of the first differential amplifier and the inverting input end of the first differential amplifier.

[0012] In an exemplary embodiment, the secondary amplification circuit comprises a second differential amplifier, a fifth adjusting resistor, a sixth adjusting resistor, and a seventh adjusting resistor; the output end of the second differential amplifier is connected to the first end of a current limiting resistor, the second end of the current limiting resistor is connected to the control unit and a filtering capacitor, the other end of the filtering capacitor is grounded; the fifth adjusting resistor is connected between the non-inverting input end of the second differential amplifier and the output end of the primary amplification circuit; one end of the sixth adjusting resistor is connected to the inverting input end of the second differential amplifier, and the other end is grounded; and the seventh adjusting resistor is connected between the output end of the second differential amplifier and the inverting input end of the second differential amplifier.

[0013] According to an aspect of the embodiments of the present application, a meter power consumption detection method is disclosed, comprising:

[0014] The energy storage circuit absorbs the current of a loop formed by the power consumption module, the sampling resistor and the power supply battery when the power consumption module works at a first current, and discharges the loop when the power consumption module works at a second current, the first current being greater than the second current, a first end of the energy storage circuit being connected to a first connection end, a second end of the energy storage circuit being connected to a junction of a second end of the sampling resistor and the power consumption module, a first end of the sampling resistor being connected to a second connection end, the first connection end and the second connection end being respectively connected to one end of the power supply battery, the power consumption module being connected between the first connection end and the second end of the sampling resistor, and the power consumption module comprising a control unit.

[0015] The control unit collects a sampling signal of the sampling resistor at intervals of a first time, and calculates the power consumption of the power consumption module according to the sampling signal of the sampling resistor.

[0016] The control unit selects a minimum value of the power consumption of the power consumption module in a preset time period as a target power consumption, and judges that the power consumption is abnormal if the target power consumption exceeds a power consumption threshold.

[0017] In an exemplary embodiment, the control unit calculates a difference value of the power consumption of the power consumption module at adjacent sampling time points in a preset time period, judges that the power consumption is abnormal if the difference value exceeds a difference value threshold, and calculates the power of the power supply battery by taking the sampling signal of the sampling resistor as a calculation parameter in the case of judging that the power consumption is abnormal.

[0018] The embodiments of the present application have at least the following beneficial effects:

[0019] The technical scheme provided by the present application collects the power supply loop voltage of the power consumption module of the meter by setting the sampling resistor, and then calculates the power consumption of the power consumption module by the control unit according to the sampling voltage, so as to realize the power consumption self-checking of the meter in use, thereby enabling the user to replace or repair the power supply battery or the meter in time according to the power consumption of the power consumption module, and ensuring the normal use of the user. Further, since the working current of the power consumption module in the static working state is much smaller than that in the dynamic working state, the power consumption module will become in the dynamic working state when the power consumption self-checking is performed, and therefore, the energy storage circuit is arranged at the back end of the sampling resistor, the current in the dynamic working state is absorbed by the energy storage circuit, so that the sampling resistor collects the voltage value after the current is balanced by the energy storage circuit, the accuracy of the static sampling is improved, and the accuracy of the meter power consumption detection is improved.

[0020] It should be understood that the foregoing general description and the following detailed description are only exemplary and cannot limit the present application. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0022] Figure 1 This is a block diagram illustrating the components of a meter according to an exemplary embodiment.

[0023] Figure 2 This is a logical schematic diagram of a meter according to an exemplary embodiment.

[0024] Figure 3 This is a circuit schematic diagram of a sampling circuit according to an exemplary embodiment.

[0025] The annotations in the attached figures are explained as follows:

[0026] 10. Power supply battery; J1. Battery socket; 1. First connection terminal; 2. Second connection terminal; 20. Power module; 21. Control unit; 22. Metering unit; 23. Display unit; 24. Communication unit; EC1. Energy storage capacitor; R32. Sampling resistor; R37. First adjustment resistor; R38. Second adjustment resistor; R52. Third adjustment resistor; R41. Fourth adjustment resistor; R54. Fifth adjustment resistor; R49. Sixth adjustment resistor; R48. Seventh adjustment resistor; R47. Current limiting resistor; C56. Filter capacitor; U10. Integrated chip; Q6. Switching transistor; R31. Current limiting resistor. Detailed Implementation

[0027] Although this application can be readily embodied in various forms of implementation, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of this application and is not intended to limit the application to what is described herein.

[0028] Therefore, a feature described in this specification is used to illustrate one feature of one embodiment of this application, and does not imply that every embodiment of this application must have the described feature. Furthermore, it should be noted that this specification describes many features. While certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0029] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" are used only for descriptive purposes and should not be construed as implying or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh" can be explicitly or implicitly included one or more features.

[0030] In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0031] It should be noted that in the embodiments of the present application, the words "exemplary" or "for example" or "for example" or the like are used to mean an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" or "for example" and the like is intended to present the relevant concept in a specific manner.

[0032] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations, however, can be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these examples are provided so that the description of the present application will be more thorough and complete, and will fully convey the concept of the example implementations to those skilled in the art. The accompanying drawings are merely schematic illustrations of the present application, and like reference numerals in the drawings represent the same or similar parts, so that repeated description thereof will be omitted.

[0033] The present application provides a meter, which is further provided with a sampling circuit and an energy storage circuit in addition to a control unit and a metering unit for performing metering functions, to realize self-checking of power consumption of the meter after it leaves the factory and during use, so that users can replace or repair the meter power supply battery or the meter in time according to the power consumption of the meter, thereby ensuring normal use of energy by users. The meter can be a gas meter, a water meter, or other meters in addition to gas meters and water meters.

[0034] The meter of the present application will be described in detail below with reference to some specific embodiments in conjunction with the drawings of the present specification.

[0035] Reference Figures 1 to 3As shown, the meter of this application includes a meter body, a power supply battery 10, a sampling circuit, and an energy storage circuit. The meter body is the component unit used to perform metering and other functions within the meter. It includes a housing (not shown) and a power module 20 disposed within the housing. The power module 20 includes one or more power-consuming units. A battery socket J1 is provided within the housing, including a first connection terminal 1 and a second connection terminal 2. The power supply battery 10 is disposed in the battery socket J1, with one end connected to the first connection terminal 1 and the other end connected to the second connection terminal 2. The power module 20 is connected to the first connection terminal 1, thereby connecting to the power supply battery 10, so that the power supply battery 10 can supply power to the power module 20. The sampling circuit includes a sampling resistor R32, with the first end of the sampling resistor R32 connected to the second connection terminal 2 and the second end of the sampling resistor R32 connected to the power module 20. That is, the power supply battery 10, the power module 20, and the sampling resistor R32 are sequentially connected to form a circuit. The power module 20 includes a control unit 21, which is used to calculate the power consumption of the power module 20 based on the sampling signal of the sampling circuit.

[0036] The first end of the energy storage circuit is connected to the first connection terminal 1, and the second end of the energy storage circuit is connected to the connection point of the second end of the sampling resistor R32 and the power module 20 and grounded. The energy storage circuit is used to absorb the current of the loop formed by the power supply battery 10, the power module 20 and the sampling resistor R32 or to discharge the loop.

[0037] Understandably, in addition to the control unit 21, the power consumption module 20 will also include a metering unit for implementing metering functions. For meters with data display and communication functions, the power consumption module 20 will also include a display unit and a communication unit.

[0038] For example, when the meter is a water meter, in an exemplary embodiment, such as Figure 1 As shown, the power module 20 includes a control unit 21, a metering unit 22, a display unit 23, and a communication unit 24. The metering unit 22, display unit 23, and communication unit 24 are all connected to the control unit 21. The control unit 21 controls the working status of the metering unit 22, display unit 23, and communication unit 24. The metering unit 22 measures water consumption and transmits the data to the control unit 21. The control unit 21 transmits data such as water consumption, remaining balance, and battery level to the display unit 23 for display and interacts with a remote server through the communication unit 24 to achieve functions such as remote meter reading.

[0039] For another example, when the meter is a gas meter, in an exemplary embodiment, such as Figure 1As shown, the power consumption module 20 includes a control unit 21, a metering unit 22, a display unit 23, and a communication unit 24, the metering unit 22, the display unit 23, and the communication unit 24 are connected with the control unit 21, and the control unit 21 controls the working states of the metering unit 22, the display unit 23, and the communication unit 24. Among them, the metering unit 22 is used to meter the gas consumption, and transmit the gas consumption to the control unit 21, the control unit 21 transmits the data such as gas consumption, remaining amount, battery power, etc. to the display unit 23 for display, and interacts with the remote server through the communication unit 24 to realize functions such as remote meter reading.

[0040] Of course, the power consumption module 20 can also include other power consumption units, such as an alarm unit for alarming when gas leakage is monitored, etc.

[0041] In an exemplary embodiment, the control unit 21 is an MCU (Microcontroller Unit).

[0042] Since the meter alternately works in a static working state and a dynamic working state, and the time of the static working state reaches more than 99%, if the power consumption of the meter in the static working state is normal, it can be considered that the whole hardware of the meter is in a normal working state, therefore, the power consumption condition of the meter can be judged by detecting the power consumption of the meter in the static working state. However, when the control unit 21 collects the sampling signal of the sampling resistor R32 and performs power consumption calculation, the control unit 21 will inevitably become in the dynamic working state, at this time, the working current required by the control unit 21 becomes large, therefore, the current of the loop formed by the power supply battery 10, the power consumption module 20, and the sampling resistor R32 will change from the small second current to the large first current, and the fluctuation of the loop current will affect the sampling signal (voltage signal) collected by the sampling resistor R32, and further affect the accuracy of the power consumption detection result.

[0043] Therefore, an energy storage circuit is arranged at the back end of the sampling resistor R32, the energy storage circuit absorbs the current in the short-term dynamic working state, and then slowly discharges, so that the sampling resistor R32 collects the voltage value balanced by the energy storage circuit after the dynamic working current and the static working current, which improves the accuracy of static sampling, and further improves the accuracy of meter power consumption detection.

[0044] For example, the meter uses a low-power control unit 21. When the control unit 21 is in a static working state, the current consumption of the power module 20 is in microamperes, i.e., the second current is in microamperes. When the control unit 21 is in a dynamic working state, the current consumption of the power module 20 is in milliamperes, i.e., the first current is in milliamperes. By setting the energy storage circuit, the energy storage circuit absorbs the current of the loop formed by the power supply battery 10, the power module 20, and the sampling resistor R32 when the power module 20 works at the first current, and slowly discharges the loop when the power module 20 works at the second current, so that the sampling resistor R32 collects the current after the first current and the second current are balanced by the energy storage circuit, thereby making the precision of static sampling reach microamperes and improving the accuracy of meter power consumption detection.

[0045] It can be understood that the static working state and the dynamic working state are not specific to the working state of the control unit 21, but also to the working state of other constituent units including the power module 20. For example, the working state of the communication unit 24, when it is necessary to interact with the remote server through the communication unit 24, the control unit 21 controls the communication unit 24 to work; otherwise, the communication unit 24 does not work; for another example, when it is necessary to collect the voltage signal of the loop formed by the power supply battery 10, the power module 20, and the sampling resistor R32, the control unit 21 controls the sampling circuit to work; otherwise, the sampling circuit does not work.

[0046] Next, referring to Figure 2 In detail, in one exemplary embodiment, the first connection end 1 is connected to the positive electrode of the power supply battery 10, and the second connection end 2 is connected to the negative electrode of the power supply battery 10. That is, the sampling resistor R32 is connected between the negative electrode of the power supply battery 10 and the power module 20. The negative electrode of the power supply battery 10 has small voltage fluctuation and small interference, and the sampling result is more accurate. Of course, in other embodiments, the sampling resistor R32 can also be connected between the positive electrode of the power supply battery 10 and the power module 20.

[0047] As Figure 2 In detail, the energy storage circuit includes an energy storage capacitor EC1, the positive electrode of the energy storage capacitor EC1 is connected to the first connection end 1 (the positive electrode of the power supply battery 10), and the negative electrode of the energy storage capacitor EC1 is connected to the second end of the sampling resistor R32 and grounded. When the power module 20 works at a larger first current, the energy storage capacitor EC1 absorbs the current of the loop formed by the power supply battery 10, the power module 20, and the sampling resistor R32; when the power module 20 works at a smaller second current, the energy storage capacitor EC1 slowly discharges the loop.

[0048] The energy storage capacitor EC1 is used as the energy storage circuit, and the cost is low. Understandably, the energy storage capacitor EC1 is not limited to be used as the energy storage circuit, and in other embodiments, an energy storage battery can be used instead of the energy storage capacitor EC1, or the energy storage battery and the energy storage capacitor EC1 can be connected in series as the energy storage circuit.

[0049] In detail, the sampling circuit includes a sampling resistor R32 and a differential amplification circuit (see Figure 3 The two input ends of the differential amplification circuit are connected to the first end and the second end of the sampling resistor R32 respectively, and the output end of the differential amplification circuit is connected to the control unit 21. The differential amplification circuit is used to amplify the sampling signal of the sampling resistor R32 and output it to the control unit 21. By amplifying the sampling signal of the sampling resistor R32 through the differential amplification circuit, the control unit 21 can identify the sampling signal; and the differential amplification circuit has strong anti-interference ability, which helps to improve the accuracy of power consumption detection.

[0050] As shown in Figure 3 The differential amplification circuit is a multi-stage amplification circuit, which includes a first-stage amplification circuit and a second-stage amplification circuit. The two input ends of the first-stage amplification circuit are connected to the first end and the second end of the sampling resistor R32 respectively, and the voltage V_OP1 is obtained by voltage amplification of the small signal (voltage signal) of the sampling resistor R32 through the first-stage amplification circuit. One input end of the second-stage amplification circuit is connected to the output end of the first-stage amplification circuit, the other input end of the second-stage amplification circuit is grounded, and the output end of the second-stage amplification circuit is connected to the control unit 21. The voltage V_OP2 that can be identified by the control unit 21 is obtained by linear amplification of the voltage V_OP1 through the second-stage amplification circuit.

[0051] In detail, as shown in Figure 3 The first-stage amplification circuit includes a first differential amplifier, a first adjusting resistor R37, a second adjusting resistor R38, a third adjusting resistor R52, and a fourth adjusting resistor R41. The first adjusting resistor R37 is connected between the positive input end INA+ of the first differential amplifier and the second end of the sampling resistor R32; the second adjusting resistor R38 is connected between the negative input end INA- of the first differential amplifier and the first end of the sampling resistor R32; one end of the third adjusting resistor R52 is connected to the positive input end INA+ of the first differential amplifier, and the other end is grounded I-GND; the fourth adjusting resistor R41 is connected between the output end OUTA of the first differential amplifier and the negative input end INA- of the first differential amplifier; and the output end OUTA of the first differential amplifier is connected to the input end of the second-stage amplification circuit.

[0052] The amplification multiple of the first differential amplifier is adjusted by the first adjusting resistor R37, the second adjusting resistor R38, the third adjusting resistor R52, and the fourth adjusting resistor R41.

[0053] As shown in Figure 3 The second differential amplifier, the fifth adjusting resistor R54, the sixth adjusting resistor R49 and the seventh adjusting resistor R48, wherein the fifth adjusting resistor R54 is connected between the positive input terminal INB+ of the second differential amplifier and the output terminal OUTA of the first differential amplifier; one end of the sixth adjusting resistor R49 is connected to the negative input terminal INB- of the second differential amplifier, and the other end is grounded I-GND; the seventh adjusting resistor R48 is connected between the output terminal OUTB of the second differential amplifier and the negative input terminal INB- of the second differential amplifier, and the output terminal OUTB of the second differential amplifier is connected to the control unit 21.

[0054] The amplification factor of the second differential amplifier is adjusted by the fifth adjusting resistor R54, the sixth adjusting resistor R49 and the seventh adjusting resistor R48.

[0055] Further, in the embodiment shown in Figure 3 The output terminal OUTB of the second differential amplifier is connected to the control unit 21 through a current limiting resistor R47. The current limiting resistor R47 is also connected to the first end of a filter capacitor C56 at the connection with the control unit 21, and the second end of the filter capacitor C56 is grounded I-GND.

[0056] In the embodiment shown in Figure 3 The first differential amplifier and the second differential amplifier are integrated in an integrated chip U10, the Vs- pin of the integrated chip U10 is grounded I-GND, the Vs+ pin of the integrated chip U10 is connected to the first end of the switch tube Q6, the second end of the switch tube Q6 is connected to the power supply VDD, the control end of the switch tube Q6 is connected to the control unit 21 through the current limiting resistor R31, when the control unit 21 outputs the control signal Ctrll to control the switch tube Q6 to be turned on, the Vs+ pin of the integrated chip U10 is connected to the power supply VDD, and the differential amplifier circuit starts to work; on the contrary, when the control unit 21 outputs the control signal Ctrll to control the switch tube Q6 to be turned off, the Vs+ pin of the integrated chip U10 has no voltage input, and the differential amplifier circuit stops to work.

[0057] In the embodiment shown in Figure 3 Figure 3 The switch tube Q6 is a field effect tube, when the control signal Ctrll output by the control unit 21 is a low level signal, the switch tube Q6 is turned on, and when the control signal Ctrll is a high level signal, the switch tube Q6 is turned off.

[0058] In addition, the application also provides a meter power consumption detection method, the meter power consumption detection method comprises:

[0059] The energy storage circuit absorbs the current of a loop formed by the power consumption module 20, the sampling resistor R32 and the power supply battery 10 when the power consumption module 20 works at a first current, and discharges the loop when the power consumption module 20 works at a second current, the first current being greater than the second current, a first end of the energy storage circuit being connected to the first connection end 1, a second end of the energy storage circuit being connected to a position where the second end of the sampling resistor R32 and the power consumption module 20 meet, a first end of the sampling resistor R32 being connected to the second connection end 2, the first connection end 1 and the second connection end 2 being respectively connected to one end of the power supply battery 10, the power consumption module 20 being connected between the first connection end 1 and the second end of the sampling resistor R32, and the power consumption module 20 comprising the control unit 21.

[0060] The control unit 21 collects the sampling signal of the sampling resistor R32 at intervals of a first time, and calculates the power consumption of the power consumption module 20 according to the sampling signal of the sampling resistor R32.

[0061] The control unit 21 selects a minimum value in the power consumption of the power consumption module 20 in a preset time period as a target power consumption, and judges that the power consumption is abnormal if the target power consumption exceeds a power consumption threshold.

[0062] Further, in an example embodiment, the control unit 21 calculates a difference value of the power consumption of the power consumption module 20 at adjacent sampling time points in the preset time period, judges that the power consumption is abnormal if the difference value exceeds a difference value threshold, and calculates the power of the power supply battery 10 by taking the sampling signal of the sampling resistor R32 as a calculation parameter in the case of judging that the power consumption is abnormal.

[0063] By taking the sampling signal of the sampling resistor R32 as a calculation parameter to calculate the power of the power supply battery 10 in the case of judging that the power consumption is abnormal, the service life of the power supply battery 10 can be corrected in time.

[0064] The preset time period can be the same date.

[0065] In addition, the power consumptions of the power consumption module corresponding to all sampling time points in the same date can be plotted into a power consumption curve diagram, and whether there is power consumption abnormality can be judged according to the difference degree of the power consumption curve diagrams between different dates.

[0066] Further, in an example embodiment, the control unit 21 outputs an alarm signal representing power consumption abnormality to a host computer in the case of judging that the meter is power consumption abnormal. The host computer can be a remote server used to realize functions such as remote meter reading. Alternatively, the control unit 21 can also be configured to be in communication connection with a terminal device such as a smart phone of a user, and in this case, the host computer can be the terminal device of the user.

[0067] It is to be understood that the application is not limited to the precise construction already described above and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A meter, characterized by, The utility model relates to a meter body, including the shell and the electric module that sets up in the shell, the shell is equipped with respectively for connecting the first connecting end and the second connecting end of one end of power supply battery, the electric module connects the first connecting end, the electric module includes control unit, sampling resistance, the first end of the sampling resistance connects the second connecting end, the second end of the sampling resistance connects the electric module, and the control unit is used for calculating the power consumption of the electric module according to the sampling signal of the sampling resistance, energy storage circuit, the first end of the energy storage circuit connects the first connecting end, and the second end of the energy storage circuit connects the second end of the sampling resistance and the junction of the electric module, and the energy storage circuit is used for absorbing the current of the loop formed by the electric module, sampling resistance, power supply battery or discharging the loop. Further comprising: a power supply battery disposed in the shell, one end of the power supply battery connected to the first connecting end, the other end connected to the second connecting end, for powering the electric module. The positive electrode of the power supply battery is connected to the first connecting end, and the negative electrode of the power supply battery is connected to the second connecting end.

2. The meter of claim 1, wherein, The energy storage circuit includes an energy storage capacitor, the positive electrode of the energy storage capacitor is connected to the first connecting end, and the negative electrode of the energy storage capacitor is connected to the second end of the sampling resistance and grounded. Further comprising:

3. The meter of claim 2, wherein, a differential amplification circuit, two input ends of the differential amplification circuit are connected to the first end and the second end of the sampling resistance respectively, and the output end of the differential amplification circuit is connected to the control unit, the differential amplification circuit is used for amplifying and outputting the sampling signal of the sampling resistance to the control unit after amplification.

4. The meter of claim 3 wherein, The differential amplification circuit includes:

5. The meter of any one of claims 1 to 4, wherein, a first-stage amplification circuit, two input ends of the first-stage amplification circuit are connected to the first end and the second end of the sampling resistance respectively; a second-stage amplification circuit, one input end of the second-stage amplification circuit is connected to the output end of the first-stage amplification circuit, the other input end of the second-stage amplification circuit is grounded, and the output end of the second-stage amplification circuit is connected to the control unit.

6. The meter of claim 5 wherein, The first-stage amplification circuit includes: a first differential amplifier, the output end of the first differential amplifier is connected to the input end of the second-stage amplification circuit; a first adjustment resistor, the first adjustment resistor is connected between the positive-phase input end of the first differential amplifier and the second end of the sampling resistance; 7. The meter of claim 6 wherein, a second adjustment resistor, the second adjustment resistor is connected between the inverting input end of the first differential amplifier and the first end of the sampling resistance; a third adjustment resistor, one end of the third adjustment resistor is connected to the positive-phase input end of the first differential amplifier, and the other end is grounded; a fourth adjustment resistor, the fourth adjustment resistor is connected between the output end of the first differential amplifier and the inverting input end of the first differential amplifier. The second-stage amplification circuit includes: a second differential amplifier, the output end of the second differential amplifier is connected to the first end of a current-limiting resistor, the second end of the current-limiting resistor is connected to the control unit and a filter capacitor, and the other end of the filter capacitor is grounded; ​ 8. The meter of claim 6 wherein, ​ ​ A fifth adjusting resistor is connected between the non-inverting input terminal of the second differential amplifier and the output terminal of the first-stage amplification circuit; A sixth adjusting resistor has one end connected to the inverting input terminal of the second differential amplifier and the other end grounded; A seventh adjusting resistor is connected between the output terminal of the second differential amplifier and the inverting input terminal of the second differential amplifier.

9. A method of meter power consumption detection, the method comprising: Comprise: The energy storage circuit absorbs the current of the loop formed by the power module, the sampling resistor and the power supply battery when the power module works at a first current, and discharges the loop when the power module works at a second current, the first current being greater than the second current, the first end of the energy storage circuit being connected to a first connecting end, the second end of the energy storage circuit being connected to the junction of the second end of the sampling resistor and the power module, the first end of the sampling resistor being connected to a second connecting end, the first connecting end and the second connecting end being respectively connected to one end of the power supply battery, the power module being connected between the first connecting end and the second end of the sampling resistor, and the power module comprising a control unit; The control unit collects the sampling signal of the sampling resistor at intervals of a first time, and calculates the power consumption of the power module according to the sampling signal of the sampling resistor; The control unit selects the minimum value of the power consumption of the power module in a preset time period as the target power consumption, and judges that the power consumption is abnormal if the target power consumption exceeds a power consumption threshold.

10. The method of claim 9, wherein, The control unit calculates the difference of the power consumption of the power module at adjacent sampling time points in a preset time period, and judges that the power consumption is abnormal if the difference exceeds a difference threshold, and calculates the power of the power supply battery by taking the sampling signal of the sampling resistor as a calculation parameter in the case of judging that the power consumption is abnormal.

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