Standard electric energy meter powered by lithium battery module

Abstract

The utility model discloses a standard electric energy meter powered by a lithium battery module, and belongs to the technical field of standard meters. The utility model relates to a standard electric energy meter, which comprises a lithium battery module, a standard electric energy meter signal conversion module and a standard electric energy meter signal processing module, the lithium battery module is used for the standard electric energy meter signal conversion module and the standard electric energy meter signal processing module. The standard electric energy meter uses the lithium battery module to supply power, power supply is stable, and the power supply quality of the standard electric energy meter is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of standard meters, and more specifically, to a standard electric energy meter powered by a lithium battery module. Background Art

[0002] The existing standard electric energy meter uses the voltage input terminal to draw power. First, the output voltage of the AC voltage source in the loop needs to be stepped down by a transformer, and then rectified into a low-voltage DC voltage by a rectifier module. After that, it is processed by a DC voltage-stabilized output module to obtain the voltage required by the electric energy meter. This power-drawing method requires the standard electric energy meter to be equipped with a large power transformer that occupies valuable space in the case, the quality of the DC power supply is not high, and drawing power from the input terminal affects the accuracy of electric energy measurement. It is not suitable for the application requirements of small-scale installed standard meters in the electric energy meter calibration line. Therefore, changing the power-drawing method of the standard electric energy meter, improving the module structure of the standard electric energy meter, and improving its electric energy measurement accuracy are technical problems that need to be solved for standard electric energy meters used in the electric energy meter calibration line. Summary of the invention

[0003] In view of the above problems, the utility model proposes a standard electric energy meter powered by a lithium battery module, comprising:

[0004] Lithium battery module, standard electric energy meter signal conversion module and standard electric energy meter signal processing module;

[0005] The lithium battery module is used as the standard electric energy meter signal conversion module and the standard electric energy meter signal processing module.

[0006] Optional, lithium battery module, including: power management system and lithium battery pack.

[0007] Optional, lithium battery pack, including: multiple lithium batteries;

[0008] The multiple lithium batteries are connected in series.

[0009] Optionally, the lithium battery pack has a capacity of at least 5600 mAh.

[0010] Optionally, the lithium battery pack is charged with DCV 12V voltage.

[0011] Optionally, the power management system includes: a charging submodule, a first buck submodule and a second buck submodule.

[0012] Optionally, the charging submodule is used to provide a DCV 12V voltage to the lithium battery pack to charge the lithium battery pack.

[0013] Optionally, the first step-down submodule and the second submodule are respectively connected in parallel to the lithium battery pack.

[0014] Optionally, the first step-down submodule is connected to a standard electric energy meter signal conversion module, and is used to convert the voltage provided by the lithium battery pack into a voltage suitable for the standard electric energy meter signal conversion module, and provide voltage for the standard electric energy meter signal conversion module.

[0015] Optionally, the second step-down submodule is connected to the standard electric energy meter signal processing module, and is used to convert the voltage provided by the lithium battery pack into a voltage suitable for the standard electric energy meter signal processing module, and provide voltage for the standard electric energy meter signal processing module.

[0016] In another aspect, the utility model further provides a computing device, comprising: one or more processors;

[0017] a processor for executing one or more programs;

[0018] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0019] On the other hand, the utility model further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the method described above is implemented.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model provides a standard electric energy meter powered by a lithium battery module, belonging to the technical field of standard meters. The standard electric energy meter of the utility model comprises: a lithium battery module, a standard electric energy meter signal conversion module and a standard electric energy meter signal processing module; the lithium battery module is used for the standard electric energy meter signal conversion module and the standard electric energy meter signal processing module. The standard electric energy meter of the utility model uses a lithium battery module for power supply, and the power supply is stable, which improves the power quality of the standard electric energy meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the standard electric energy meter of the utility model;

[0023] Figure 2 This is a schematic diagram of the current I / V conversion circuit of the standard electric energy meter of the utility model;

[0024] Figure 3 This is a schematic diagram of the voltage V / V gain conversion circuit of the standard electric energy meter of the utility model;

[0025] Figure 4 A schematic diagram of a module of a standard electric energy meter powered by a lithium battery module of the standard electric energy meter of the utility model;

[0026] Figure 5It is a schematic diagram of the circuit structure of the charging management module of the power management system of the standard electric energy meter of the utility model;

[0027] Figure 6 The schematic diagram of the circuit structure of the voltage reduction module of the power management system of the standard electric energy meter of the utility model is shown in FIG. DETAILED DESCRIPTION

[0028] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0029] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0030] Embodiment 1:

[0031] The utility model proposes a standard electric energy meter powered by a lithium battery module, such as Figure 1 As shown, including:

[0032] Lithium battery module, standard electric energy meter signal conversion module and standard electric energy meter signal processing module;

[0033] The lithium battery module is used as the standard electric energy meter signal conversion module and the standard electric energy meter signal processing module.

[0034] Among them, the lithium battery module includes: a power management system and a lithium battery pack.

[0035] Wherein, the lithium battery pack includes: multiple lithium batteries;

[0036] The multiple lithium batteries are connected in series.

[0037] Among them, the lithium battery pack has a capacity of at least 5600mAh.

[0038] Among them, the lithium battery pack is charged with DCV 12V voltage.

[0039] The power management system includes: a charging submodule, a first buck submodule and a second buck submodule.

[0040] The charging submodule is used to provide a DCV 12V voltage to the lithium battery pack to charge the lithium battery pack.

[0041] The first step-down submodule and the second submodule are respectively connected in parallel with the lithium battery pack.

[0042] The first step-down submodule is connected to the standard electric energy meter signal conversion module, and is used to convert the voltage provided by the lithium battery pack into a voltage suitable for the standard electric energy meter signal conversion module, and provide voltage for the standard electric energy meter signal conversion module.

[0043] The second step-down submodule is connected to the standard electric energy meter signal processing module, and is used to convert the voltage provided by the lithium battery pack into a voltage suitable for the standard electric energy meter signal processing module, and provide voltage for the standard electric energy meter signal processing module.

[0044] The present invention will be further described below in conjunction with the embodiments:

[0045] The utility model standard electric energy meter, such as Figure 1 As shown, it includes: signal conversion module, signal processing module and lithium battery module power supply module. The logical architecture diagram of the standard electric energy meter is as follows Figure 1 The improvement lies in that the power supply module of the traditional standard electric energy meter is improved, and a lithium battery module power supply module is provided to replace the traditional power supply transformer, and the lithium battery module is used to provide 5V voltage power supply for the signal conversion module and 2.5V voltage power supply for the signal processing module, which saves space in the meter case and improves the power quality of the power supply module, thereby improving the electric energy measurement accuracy of the standard electric energy meter.

[0046] The signal conversion module includes: a current I / V conversion circuit and a voltage V / V gain conversion circuit.

[0047] The current I / V conversion circuit converts the input current into a voltage that can be sampled and measured by AD through a precision platinum resistor, and finally completes the current measurement by measuring the voltage. When converting the current to voltage (I / V), the precision resistor is first connected in series to the external input current signal, and the voltage signal on the resistor is converted by an amplifier, and finally a voltage value suitable for AD sampling is obtained. The specific circuit is as follows:

[0048] Figure 2 The resistance value of the precision resistor R in the figure, the output current of the transformer is I, the voltage on both sides of the precision resistor is U1, the voltage at the input of the operational amplifier after the instrumentation amplifier is U2, and the output of the operational amplifier is U3.

[0049] The voltage V / V gain conversion circuit is designed by using a variable gain instrument amplifier for inverting amplification and an operational amplifier for reverse amplification, as follows: Figure 3 As shown:

[0050] Among them, the voltage of the external input is U1, the voltage of the operational amplifier input after the instrumentation amplifier is U2, and the output of the operational amplifier is U3.

[0051] The signal processing module mainly includes a high-performance DSP processor, which is connected to a display module, a clock module and a communication module respectively. The display module is used to display the measurement results, such as directly displaying numbers or texts on a display screen. The clock module is used to provide an accurate synchronous sampling clock for a high-precision A / D conversion unit to achieve high-stability sampling. The communication module is used to communicate with a remote terminal, such as through RS485, WiFi, Bluetooth, etc. The signal processing module can directly convert the calculation processing results into standard electric energy output pulses.

[0052] The high-performance DSP processor reads the 24-bit AD chip of voltage and current at high speed through its SPI interface, and can read AD sampling data at high speed and realize high-speed data processing through its built-in SPI DMA mode.

[0053] The module diagram of a standard electric energy meter powered by a lithium battery module is as follows: Figure 4 As shown. The lithium battery module of the standard energy meter includes a rechargeable lithium battery pack and a corresponding power management system. The lithium battery pack adopts a multi-cell lithium battery connected in series and parallel, so that the combined battery pack has a capacity of 5600mAh and can be charged with a DCV 12V voltage. The power management system consists of a charging management module and a step-down module that provides power supply function. The charging management module and the step-down module are both connected to the lithium battery pack, wherein the charging management module is responsible for managing the charging of the lithium battery pack and can control the power enable signal to manage the power supply of the lithium battery pack. The step-down module includes a first step-down module and a second step-down module connected in parallel to the lithium battery pack. The first step-down module and the second step-down module respectively reduce the voltage of the lithium battery pack to a 5V voltage suitable for the signal conversion module for power supply and a 2.5V voltage suitable for the signal processing module for power supply.

[0054] Combine the following Figure 5 and Figure 6 Let's introduce the working principle of the power management system of the lithium battery module. Figure 5 This is a schematic diagram of the circuit structure of the charging management module of the power management system. Figure 5In the schematic diagram, P1 represents a DC charger (which is provided outside the standard electric energy meter to provide a DCV 12V charging voltage), U1 represents a BMS unit of a lithium battery pack, D1 represents a rectifier diode, G1 represents a controllable switch tube, SW represents a switch key, B1 represents a lithium battery pack, and M1 represents a power conversion module of a lithium battery pack. Among them, the BMS unit U1 of the lithium battery pack is connected to the lithium battery pack B1 and the DC charger P1 through the parallel connection of the rectifier diode D1, the controllable switch tube G1 and the switch key SW, and the power conversion module M1 is connected to the lithium battery pack B1 and the BMS unit U1. The BMS unit U1 plays the role of simultaneously detecting the voltage of the DC charger P1 and the lithium battery pack B1 and controlling the controllable switch tube G1 to manage the charging of the lithium battery pack B1 according to the voltage of the two; at the same time, the BMS unit U1 can also control the power enable signal according to the voltage of the lithium battery pack B1 and the operation of the user switch SW to turn on the power supply of the power conversion module M1 to provide the output voltage VoN or turn off the power supply of the power conversion module M1.

[0055] Specifically, when the output voltage of the DC charger P1 is within the normal range and the lithium battery pack B1 is not fully charged, the BMS unit U1 can control the controllable switch tube G1 to turn on to charge the lithium battery pack B1; when the battery is fully charged, the BMS unit U1 controls the controllable switch tube G1 to turn off and stop charging the lithium battery pack B1.

[0056] When the battery power is not in an undervoltage state, if the switch SW is actuated, the BMS unit U1 controls the signal of the power conversion module M1 to be flipped: if the power conversion module M1 was originally in the on state, that is, the standard meter device is in the running state, then the action of the switch SW at this time will cause the power conversion module M1 to become the off state and stop supplying power, and the device will be in the shutdown state; if the power conversion module M1 was originally in the off state, then the action of the switch SW at this time will cause the power conversion module M1 to become the on state, and the power conversion module M1 controls the power enable signal to power the device, and the device is in the boot-up and running state.

[0057] In particular, if the current battery power is undervoltage, the switch SW action will not control the power conversion module M1. At this time, the BMS unit U1 controls the power conversion module M1 to be in a closed state, and the device will be in a shut-down state.

[0058] Figure 6 Figure 1 is a schematic diagram of the circuit structure of the voltage reduction module of the power management system. Figure 6 The schematic diagram shows two step-down modules connected in parallel to the lithium battery pack, wherein the first step-down module steps down the voltage of the lithium battery pack to a voltage suitable for the signal conversion module for power supply, and the second step-down module steps down the voltage of the lithium battery pack to a voltage suitable for the signal processing module for power supply. Figure 5 similar, Figure 6B1 in the figure represents a lithium battery pack, and M1 represents a power conversion module of the lithium battery pack (the BMS unit U1 controls the power enable signal P-EN to start the power supply of the power conversion module M1). Figure 6 T1 and T2 represent transformers, Rf1 and Rf2 represent feedback resistors, D2 and D3 represent rectifier diodes, and C1 and C2 represent filter capacitors. Rf1, T1, D2, and C1 constitute a first step-down module, which is connected between the power conversion module M1 of the lithium battery module and the signal conversion module of the standard electric energy meter. The first step-down module reduces the voltage of the lithium battery pack to a 5V voltage Vo1 suitable for the signal conversion module of the standard electric energy meter for power supply, wherein the feedback resistor Rf1 is connected to the primary winding side of the transformer T1 to adjust the output voltage, and D2 and C1 are connected to the secondary winding side of T1 to perform rectification and filtering. Similarly, Rf2, T2, D3, and C2 constitute a second step-down module, which is connected between the power conversion module M1 of the lithium battery module and the signal processing module of the standard electric energy meter. It reduces the voltage of the lithium battery pack to a 2.5V voltage Vo2 suitable for the signal processing module of the standard electric energy meter for power supply, wherein the feedback resistor Rf2 is connected to the primary winding side of the transformer T2 to adjust the output voltage, and D3 and C2 are connected to the secondary winding side of T2 to perform rectification and filtering.

[0059] In the actual use of the standard energy meter, when the battery power is not in an undervoltage state and the power conversion module M1 is in an on state, the power enable signal P-EN causes the power conversion module M1 to periodically drive the primary winding and secondary winding of the transformers T1 and T2 to perform voltage reduction and rectification filtering to generate the desired DC voltages Vo1 and Vo2 to respectively power the signal conversion module and the signal processing module of the standard energy meter. The power supply module of the standard energy meter provided by the utility model can provide excellent stability and instantaneous response.

[0060] The lithium battery module of the utility model can provide a 5V voltage to power the signal conversion unit of the standard electric energy meter, and provide a 2.5V voltage to power the signal processing unit of the standard electric energy meter. By changing the power supply method of the standard electric energy meter, the module structure of the standard electric energy meter is improved, and the power quality of the power supply module is improved while saving space in the meter case, thereby improving the electric energy measurement accuracy of the standard electric energy meter and meeting the business application requirements of the electric energy meter calibration line system.

[0061] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The scheme in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0062] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0063] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0065] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A standard electric energy meter powered by a lithium battery module, characterized in that: The standard electric energy meter comprises: Lithium battery module, standard electric energy meter signal conversion module and standard electric energy meter signal processing module; The lithium battery module is used to supply power to the standard electric energy meter signal conversion module and the standard electric energy meter signal processing module; The lithium battery module comprises: a power management system and a lithium battery pack; The lithium battery pack comprises: a plurality of lithium batteries; The multiple lithium batteries are connected in series; The lithium battery pack has a capacity of at least 5600 mAh; The lithium battery pack is charged with a DCV 12V voltage; The power management system comprises: a charging submodule, a first buck submodule and a second buck submodule; The charging submodule is used to provide a DCV 12V voltage to the lithium battery pack to charge the lithium battery pack; The first step-down submodule and the second submodule are respectively connected in parallel with the lithium battery pack; The first step-down submodule is connected to the standard electric energy meter signal conversion module, and is used to convert the voltage provided by the lithium battery pack into a voltage suitable for the standard electric energy meter signal conversion module, and provide voltage for the standard electric energy meter signal conversion module; The second step-down submodule is connected to the standard electric energy meter signal processing module, and is used to convert the voltage provided by the lithium battery pack into a voltage suitable for the standard electric energy meter signal processing module, and provide voltage for the standard electric energy meter signal processing module.

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