Electric energy meter calibration device

Abstract

The invention belongs to the technical field of electric energy meter calibration, and particularly relates to an electric energy meter calibration device. The input end of a load is provided with a voltage acquisition unit and a current acquisition unit; the voltage acquisition unit and the current acquisition unit are respectively connected with the microprocessor module; the pulse signal acquisition module is respectively connected with the electric energy meter and the microprocessor module and is used for acquiring pulse signals of electric energy; the collected pulses are input to the microprocessor module for counting the number of the pulses; the microprocessor module carries out first electric energy calculation on the number of received pulse signals in time T according to parameters of a to-be-verified electric energy meter, and calculates second electric energy according to the voltage collected by the voltage collection unit and the current collected by the current collection unit in combination with the time T at the same time. And comparing the calculated first electric energy with the second electric energy and outputting a verification result to a display module. Accurate measurement and verification of the output electric energy of the electric energy meter can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric energy meter calibration, and particularly relates to an electric energy meter calibration device. Background Art

[0002] With the rapid development of the power industry and the construction of smart grids, the accuracy and reliability of electric energy meters have become increasingly important. As the core device for electric power metering and settlement, the accuracy of electric energy meters is directly related to the fairness of electric power transactions and the economic benefits of power enterprises. Therefore, regular calibration of electric energy meters is a necessary means to ensure metering accuracy.

[0003] Most traditional electric energy meter calibration devices use manual operation and mechanical recording, which have problems such as cumbersome operation, large errors, and low efficiency. In recent years, with the development of electronic technology and computer technology, some electric energy meter calibration devices have begun to use digital and automated methods for calibration. However, some devices are affected by noise interference during data acquisition, resulting in low-precision collected data and affecting the accuracy of calibration results. Some calibration devices may lack good interactive design, resulting in users being unable to conveniently set calibration parameters, view calibration results, or perform other operations. This may limit the flexibility and convenience of calibration. Summary of the Invention

[0004] Aiming at the problem that some devices are affected by noise interference during data acquisition, resulting in low-precision collected data and affecting the accuracy of calibration results, the present invention provides an electric energy meter calibration device.

[0005] The technical solution of the present invention provides an electric energy meter calibration device, including a regulated power supply module, a pulse signal acquisition module, a load, and a microprocessor module; the microprocessor module is connected to a display module, and the user sets the parameters of the electric energy meter to be calibrated through the display module and inputs the set parameter information into the microprocessor module; The regulated power supply module is connected to the input end of the electric energy meter to be calibrated, and the output end of the electric energy meter to be calibrated is connected to the load; a voltage acquisition unit and a current acquisition unit are provided at the input end of the load; the voltage acquisition unit and the current acquisition unit are respectively connected to the microprocessor module; The pulse signal acquisition module is respectively connected to the electric energy meter and the microprocessor module, and is used for acquiring the pulse signal of electric energy; and inputting the acquired signal into the microprocessor module for counting the number of pulses; The microprocessor module calculates the first electric energy based on the parameters of the electric energy meter to be calibrated for the number of pulse signals received within the time T, and at the same time calculates the second electric energy based on the voltage collected by the voltage acquisition unit and the current collected by the current acquisition unit in combination with the time T, and compares the calculated first electric energy with the second electric energy and outputs the calibration result to the display module.

[0006] The user sets the parameters of the electricity meter to be calibrated through the display module, such as the calibration time, metering parameters of the electricity meter, etc., and inputs this parameter information into the microprocessor module. The regulated power supply module provides power for the electricity meter to be calibrated, and at the same time, the load simulates the actual power consumption situation. The voltage acquisition unit and the current acquisition unit respectively acquire the voltage and current signals at the load end, and input these signals into the microprocessor module. The pulse signal acquisition module acquires the pulse signal of the electricity meter and counts the number of pulses within the set time T. The microprocessor module calculates the first electric energy and the second electric energy respectively according to the acquired voltage, current signals and pulse signals. The first electric energy is calculated according to the number of pulse signals and the parameters of the electricity meter, and the second electric energy is calculated according to the voltage, current and time T. The microprocessor module compares the calculated first electric energy and second electric energy, judges the accuracy of the electricity meter according to the preset error range, and outputs the calibration result. If the calibration result does not meet the requirements, adjustment or repair is required.

[0007] As an optimization of the technical solution of the present invention, the regulated power supply module includes a battery, and the battery is connected with an electricity meter power supply unit and a device power supply unit. The electricity meter power supply unit and the device power supply unit are connected in parallel at both ends of the battery; The electricity meter power supply unit is connected to the input end of the electricity meter to be calibrated; The device power supply unit is used to supply power to the pulse signal acquisition module, the microprocessor module and the display module.

[0008] As an optimization of the technical solution of the present invention, the electricity meter power supply unit includes a first voltage stabilization circuit and an inverter; The input end of the first voltage stabilization circuit is connected to the battery, the output end of the first voltage stabilization circuit is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the electricity meter to be calibrated.

[0009] As an optimization of the technical solution of the present invention, the first voltage stabilization circuit includes a switch unit and a DC-DC chip; The battery is sequentially connected to the input end of the DC-DC chip through the switch unit and the inductor L3. The battery is also grounded through the voltage stabilizing diode D2. One end of the inductor L3 connected to the switch unit is grounded through the capacitor C6. The input end of the DC-DC chip is also grounded through the capacitors C7 and C8 connected in parallel. The output end of the DC-DC chip outputs the power supply Vdc through the inductor L4; the first end of the inductor L4 is connected to the DC-DC chip, the second end of the inductor L4 is connected to the positive input end of the voltage follower through the resistor R9, the positive input end of the voltage follower is also grounded through the resistor R8, the output end of the voltage follower is connected to the feedback end of the DC-DC chip, and the second end of the inductor L4 is also grounded through the capacitor C9; The power supply Vdc is connected to the input end of the electricity meter to be calibrated through the inverter.

[0010] Preferably, as a technical solution of the present invention, the device power supply unit includes a second voltage stabilizing circuit and a third voltage stabilizing circuit. The input end of the second voltage stabilizing circuit is connected to the battery, and the output end of the second voltage stabilizing circuit is respectively connected to the pulse signal acquisition module and the microprocessor module to supply power to the pulse signal acquisition module and the microprocessor module; the input end of the third voltage stabilizing circuit is connected to the battery, and the output end of the third voltage stabilizing circuit is connected to the display module to supply power to the display module.

[0011] Preferably, as a technical solution of the present invention, the second voltage stabilizing circuit includes a step-down chip, an inductor L1 and an inductor L2; The battery is connected to the first end of the inductor L1. The second end of the inductor L1 is connected to the input end of the step-down chip. The enable end of the step-down chip is grounded through a series-connected resistor R1 and capacitor C1, and the enable end of the step-down chip is also grounded through a resistor R2. The second end of the inductor L1 is also connected to the connection point of the resistor R1 and the capacitor C1; the start-up voltage end of the step-down chip is grounded through a series-connected capacitor C2, resistor R3 and diode D1, where the resistor R3 is connected to the cathode of the diode D1. The output end of the step-down chip outputs a power supply VCC1 through the inductor L2; the output end of the step-down chip is also connected to the cathode of the diode D1. The end of the inductor L2 connected to the output end of the step-down chip is the first end. The second end of the inductor L2 is connected to the feedback end of the step-down chip through a resistor R5. A capacitor C3 is connected in parallel at both ends of the resistor R5. The feedback end of the step-down chip is also grounded through a resistor R4. The second end of the inductor L2 is also grounded through a parallel-connected capacitor C4 and capacitor C5.

[0012] Preferably, as a technical solution of the present invention, the pulse signal acquisition module includes an optical pulse signal acquisition unit and an electrical pulse signal acquisition unit; The power supply ends of the optical pulse signal acquisition unit and the electrical pulse signal acquisition unit are respectively connected to the output end of the second voltage stabilizing circuit; The pulse signal output ends of the optical pulse signal acquisition unit and the electrical pulse signal acquisition unit are respectively connected to the microprocessor module.

[0013] Preferably, as a technical solution of the present invention, the optical pulse signal acquisition unit includes an optical pulse signal acquisition interface and a first optocoupler; The positive end of the optical pulse signal acquisition interface is connected to the anode of the diode of the first optocoupler through a resistor R10. The cathode of the diode of the first optocoupler is connected to the negative end of the optical pulse signal acquisition interface. The collector of the transistor of the first optocoupler is connected to the power supply VCC1. The emitter of the transistor of the first optocoupler is grounded through a resistor R11, and the emitter of the transistor of the first optocoupler is also connected to the microprocessor module; both ends of the diode of the first optocoupler are connected through a transient suppression diode D3.

[0014] Preferably, as a technical solution of the present invention, the electric pulse signal acquisition unit includes an electric pulse signal acquisition interface and a second opto-coupler; The positive terminal of the electric pulse signal acquisition interface is connected to the anode of the diode of the second opto-coupler, the cathode of the diode of the first opto-coupler is connected to the negative terminal of the electric pulse signal acquisition interface, the collector of the triode of the second opto-coupler is connected to the power supply VCC1, the emitter of the triode of the second opto-coupler is grounded through a resistor R13, and the emitter of the triode of the second opto-coupler is also connected to the microprocessor module; both ends of the diode of the second opto-coupler are connected through a transient suppression diode D4, and the anode of the diode of the second opto-coupler is also connected to the power supply VCC1 through a resistor R12.

[0015] Preferably, as a technical solution of the present invention, the display module is a touch screen display module.

[0016] Advantages of the technical solution of the present invention: By designing a regulated power supply module, the inaccuracy of data acquisition caused by power supply stability problems can be reduced. Through a high-precision voltage acquisition unit, a current acquisition unit, and an accurate pulse signal acquisition module, accurate measurement and verification of the electrical energy output by the watt-hour meter can be achieved. Using a microprocessor module for data processing and analysis can significantly speed up the verification speed and reduce the verification time. This device can not only verify the basic measurement parameters of the watt-hour meter, but also comprehensively evaluate its comprehensive performance, such as error distribution, stability, etc. Through the display module, users can conveniently set verification parameters and view verification results, improving the convenience and intuitiveness of user use. Description of the Drawings

[0017] In order to more clearly illustrate the technical solution of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic block diagram of the device provided by the present invention.

[0019] Figure 2 It is the connection diagram of the first regulated circuit.

[0020] Figure 3 It is the connection diagram of the second regulated circuit.

[0021] Figure 4 It is the circuit connection diagram of the optical pulse signal acquisition unit.

[0022] Figure 5 It is the circuit connection diagram of the electric pulse signal acquisition unit. Detailed implementation manners

[0023] To make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the specific embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this patent.

[0024] As Figure 1 shown, an electric energy meter calibration device provided by an embodiment of the present invention includes a regulated power supply module, a pulse signal acquisition module, a load, and a microprocessor module; the microprocessor module is connected to a display module, and a user sets parameters of the electric energy meter to be calibrated through the display module and inputs the set parameter information into the microprocessor module; The regulated power supply module is connected to the input end of the electric energy meter to be calibrated, and the output end of the electric energy meter to be calibrated is connected to the load; a voltage acquisition unit and a current acquisition unit are provided at the input end of the load; the voltage acquisition unit and the current acquisition unit are respectively connected to the microprocessor module; The pulse signal acquisition module is respectively connected to the electric energy meter and the microprocessor module, and is used for acquiring the pulse signal of the electric energy; and inputting the acquired signal into the microprocessor module for counting the number of pulses; The microprocessor module calculates the first electric energy of the pulse signal received within the time T according to the parameters of the electric energy meter to be calibrated, and at the same time calculates the second electric energy according to the voltage acquired by the voltage acquisition unit and the current acquired by the current acquisition unit combined with the time T, and compares the calculated first electric energy with the second electric energy and outputs the calibration result to the display module.

[0025] The user sets the parameters of the electric energy meter to be calibrated, such as the calibration time, the measurement parameters of the electric energy meter, etc., through the display module and inputs this parameter information into the microprocessor module. The regulated power supply module provides electric energy for the electric energy meter to be calibrated, and at the same time the load simulates the actual power consumption situation. The voltage acquisition unit and the current acquisition unit respectively acquire the voltage and current signals at the load end and input these signals into the microprocessor module. The pulse signal acquisition module acquires the pulse signal of the electric energy meter and counts the number of pulses within the set time T. The microprocessor module calculates the first electric energy and the second electric energy respectively according to the acquired voltage, current signals and pulse signals. The first electric energy is calculated according to the number of pulse signals and the parameters of the electric energy meter, and the second electric energy is calculated according to the voltage, current and time T. The microprocessor module compares the calculated first electric energy and second electric energy, judges the accuracy of the electric energy meter according to the preset error range, and outputs the calibration result. If the calibration result does not meet the requirements, adjustment or repair is required.

[0026] In some embodiments, the regulated power supply module includes a battery, the battery is connected to a watt-hour meter power supply unit and a device power supply unit, and the watt-hour meter power supply unit and the device power supply unit are connected in parallel across the battery. The watt-hour meter power supply unit is connected to the input end of the watt-hour meter to be calibrated. The device power supply unit is used to supply power to the pulse signal acquisition module, the microprocessor module, and the display module.

[0027] The regulated power supply module in the watt-hour meter calibration device provides electrical energy through a battery. The battery supplies power through two parallel branches, namely the watt-hour meter power supply unit and the device power supply unit. The watt-hour meter power supply unit directly supplies electrical energy to the watt-hour meter to be calibrated, while the device power supply unit provides the required electrical energy for the pulse signal acquisition module, the microprocessor module, and the display module inside the calibration device.

[0028] Through the regulated power supply module, it can ensure that the electrical energy supplied to the watt-hour meter to be calibrated and the internal modules of the calibration device is stable, avoiding calibration errors caused by voltage fluctuations. The separate design of the watt-hour meter power supply unit and the device power supply unit makes the calibration device more flexible in power supply, and easier to maintain and upgrade.

[0029] Specifically, the watt-hour meter power supply unit includes a first voltage regulation circuit and an inverter. The input end of the first voltage regulation circuit is connected to the battery, the output end of the first voltage regulation circuit is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the watt-hour meter to be calibrated.

[0030] The watt-hour meter power supply unit includes a first voltage regulation circuit and an inverter. The electrical energy provided by the battery first undergoes preliminary voltage regulation through the first voltage regulation circuit and then is output to the inverter. The inverter converts direct current into alternating current to meet the input requirements of the watt-hour meter to be calibrated. The design of the inverter enables the calibration device to adapt to different types of watt-hour meters, especially those that require alternating current input. The presence of the first voltage regulation circuit can protect the inverter from voltage fluctuations and extend its service life.

[0031] In some embodiments, as Figure 2 shown, the first voltage regulation circuit includes a switch unit and a DC-DC chip U2. The battery BU is sequentially connected to the input end of the DC-DC chip U2 through the switching unit and the inductor L3. The battery BU is also grounded through the voltage stabilizing diode D2. One end of the inductor L3 connected to the switching unit is grounded through the capacitor C6. The input end of the DC-DC chip U2 is also grounded through the capacitor C7 and the capacitor C8 connected in parallel. The output end of the DC-DC chip U2 outputs the power supply Vdc through the inductor L4. The first end of the inductor L4 is connected to the DC-DC chip U2, and the second end of the inductor L4 is connected to the positive input end of the voltage follower through the resistor R9. The positive input end of the voltage follower A is also grounded through the resistor R8. The output end of the voltage follower is connected to the feedback end of the DC-DC chip. The second end of the inductor L4 is also grounded through the capacitor C9. The power supply Vdc is connected to the input end of the watt-hour meter to be calibrated through the inverter.

[0032] The switching unit includes a switch S1, a resistor R6, and a resistor R7. The drain of the switch S1 is connected to the output end of the battery, and the source of the switch S1 is connected to the inductor L3. The source of the switch S1 is also grounded through the resistor R7 and the resistor R6 connected in series, and the connection point of the resistor R7 and the resistor R6 is connected to the gate of the switch S1.

[0033] The first voltage stabilizing circuit realizes the voltage stabilizing function through the switching unit and the DC-DC chip. The electric energy provided by the battery is input to the DC-DC chip through the switching unit and the inductor L3, and a stable DC power supply Vdc is output after being adjusted by the chip. This power supply is supplied to the watt-hour meter to be calibrated through the inverter. At the same time, the feedback circuit composed of the voltage follower and related resistors and capacitors ensures the stability and accuracy of the output voltage. The combination of the DC-DC chip and the feedback circuit realizes an efficient voltage stabilizing function, ensuring the stability and accuracy of the output voltage. The switching unit and related resistors and capacitors provide overcurrent, overvoltage and other protection mechanisms for the circuit, improving the reliability and safety of the circuit.

[0034] In some embodiments, the device power supply unit includes a second voltage stabilizing circuit and a third voltage stabilizing circuit. The input end of the second voltage stabilizing circuit is connected to the battery, and the output end of the second voltage stabilizing circuit is respectively connected to the pulse signal acquisition module and the microprocessor module to supply power to the pulse signal acquisition module and the microprocessor module. The input end of the third voltage stabilizing circuit is connected to the battery, and the output end of the third voltage stabilizing circuit is connected to the display module to supply power to the display module.

[0035] The device power supply unit includes a second voltage stabilizing circuit and a third voltage stabilizing circuit. The electric energy provided by the battery passes through these two voltage stabilizing circuits respectively to provide the required stable electric energy for the pulse signal acquisition module, the microprocessor module, and the display module. The separate design of the second voltage stabilizing circuit and the third voltage stabilizing circuit enables each module inside the calibration device to obtain independent and stable power supply, improving the accuracy and reliability of calibration. Different voltage stabilizing circuits can be designed and adjusted according to the power requirements of different modules, improving the adaptability and flexibility of the calibration device.

[0036] As Figure 3 shown, the second voltage stabilizing circuit includes a buck chip, inductor L1, and inductor L2; The battery BU is connected to the first end of inductor L1. The second end of inductor L1 is connected to the input terminal Vin of buck chip U1. The enable terminal EN of buck chip U1 is grounded through a series-connected resistor R1 and capacitor C1, and the enable terminal EN of buck chip U1 is also grounded through resistor R2. The second end of inductor L1 is also connected to the connection point of resistor R1 and capacitor C1. The start-up voltage terminal BST of the buck chip is grounded through a series-connected capacitor C2, resistor R3, and diode D1, where resistor R3 is connected to the cathode of diode D1. The output terminal OUT of buck chip U1 outputs power supply VCC1 through inductor L2. The output terminal of the buck chip is also connected to the cathode of diode D1. The end of inductor L2 connected to the output terminal of the buck chip is the first end. The second end of inductor L2 is connected to the feedback terminal FB of the buck chip through resistor R5. Capacitor C3 is connected in parallel across both ends of resistor R5. The feedback terminal of the buck chip is also grounded through resistor R4. The second end of inductor L2 is also grounded through a parallel-connected capacitor C4 and capacitor C5.

[0037] The second voltage stabilizing circuit realizes the voltage stabilizing function through components such as a buck chip, inductor L1, and inductor L2. The electric energy provided by the battery is first input to the input terminal of the buck chip through inductor L1, and after being adjusted by the chip, a stable DC power supply VCC1 is output. This power supply, through a feedback circuit composed of inductor L2 and related resistors and capacitors, ensures the stability and accuracy of the output voltage. The combination of the buck chip and the feedback circuit realizes an efficient buck function, ensuring the stability and accuracy of the output voltage. Inductors L1, L2, and related resistors and capacitors provide overcurrent, overvoltage, and other protection mechanisms for the circuit, improving the reliability and safety of the circuit.

[0038] It should be noted that the circuit structure of the third voltage stabilizing circuit can be the same as that of the second voltage stabilizing circuit or can be implemented using existing known voltage stabilizing circuits, which will not be elaborated here.

[0039] In some embodiments, the pulse signal acquisition module includes an optical pulse signal acquisition unit and an electrical pulse signal acquisition unit; The power supply terminals of the optical pulse signal acquisition unit and the electrical pulse signal acquisition unit are respectively connected to the output terminal of the second voltage stabilizer circuit; The pulse signal output terminals of the optical pulse signal acquisition unit and the electrical pulse signal acquisition unit are respectively connected to the microprocessor module.

[0040] The pulse signal acquisition module includes an optical pulse signal acquisition unit and an electrical pulse signal acquisition unit. These two units are respectively powered by the power supply VCC1 provided by the second voltage stabilizer circuit, and respectively transmit the acquired optical pulse signals and electrical pulse signals to the microprocessor module for processing. The design of the optical pulse signal acquisition unit and the electrical pulse signal acquisition unit enables the calibration device to simultaneously acquire and process different types of pulse signals, improving the accuracy and comprehensiveness of calibration. The separate design of the two acquisition units makes the calibration device more flexible in pulse signal acquisition, and easier to maintain and upgrade.

[0041] As Figure 4 shown, the optical pulse signal acquisition unit includes an optical pulse signal acquisition interface J1 and a first optocoupler U3; The positive terminal of the optical pulse signal acquisition interface J1 is connected to the anode of the first optocoupler diode through a resistor R10, the cathode of the first optocoupler diode is connected to the negative terminal of the optical pulse signal acquisition interface, the collector of the first optocoupler triode is connected to the power supply VCC1, the emitter of the first optocoupler triode is grounded through a resistor R11, and the emitter of the first optocoupler triode is also connected to the microprocessor module; both ends of the first optocoupler diode are connected through a transient suppression diode D3.

[0042] The optical pulse signal acquisition unit receives optical pulse signals through the optical pulse signal acquisition interface, and converts the optical signals into electrical signals through the first optocoupler. After the current limiting of the resistor R11, the electrical signals are transmitted to the microprocessor module for processing. At the same time, the transient suppression diode D3 provides overvoltage protection for the circuit. The design of the first optocoupler realizes the conversion of optical signals into electrical signals, enabling the calibration device to acquire and process optical pulse signals. The transient suppression diode D3 provides overvoltage protection for the circuit, improving the reliability and safety of the circuit. It should be noted that the optical pulse signal acquisition unit does not require a pull-up resistor to connect to the power supply because the optical indication circuit of the electric energy meter connected to the optical pulse signal acquisition interface itself provides power.

[0043] As Figure 5 shown, the electrical pulse signal acquisition unit includes an electrical pulse signal acquisition interface J2 and a second optocoupler U4; The positive terminal of the electrical pulse signal acquisition interface J2 is connected to the anode of the second optocoupler diode, the cathode of the first optocoupler diode is connected to the negative terminal of the electrical pulse signal acquisition interface, the collector of the second optocoupler triode is connected to the power supply VCC1, the emitter of the second optocoupler triode is grounded through the resistor R13, and the emitter of the second optocoupler triode is also connected to the microprocessor module; both ends of the second optocoupler diode are connected through the transient suppression diode D4, and the anode of the second optocoupler diode is also connected to the power supply VCC1 through the resistor R12.

[0044] The electrical pulse signal acquisition unit receives the electrical pulse signal through the electrical pulse signal acquisition interface and isolates and transmits the electrical signal through the second optocoupler. After the electrical signal is limited in current by the resistor R13, it is transmitted to the microprocessor module for processing. At the same time, the transient suppression diode D4 provides overvoltage protection for the circuit, and the resistor R12 serves as a pull-up resistor to provide current limiting function. The design of the second optocoupler realizes the isolation and transmission of electrical signals, improves the anti-interference ability and stability of the circuit. The transient suppression diode D4 and the resistor R12 provide overvoltage protection and current limiting function for the circuit, improving the reliability and safety of the circuit.

[0045] In some embodiments, the display module is a touch screen display module. The display module adopts a touch screen display module for displaying various information and results during the calibration process. Users can interact with the calibration device through the touch screen to achieve operations such as parameter setting and result viewing. The design of the touch screen display module enables users to intuitively understand various information and results during the calibration process, improving the convenience and efficiency of calibration. The touch screen display module supports multiple operation methods and display modes, and can be customized and adjusted according to user needs, improving the flexibility and adaptability of the calibration device. For example, the electrical energy meter calibration parameter is set to the meter constant through the touch screen display, and 6400imp / kWh means that 1 degree of electricity can make the electrical energy meter pulse count 6400 times.

[0046] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric energy meter calibration device, characterized in that, It includes a regulated power supply module, a pulse signal acquisition module, a load, and a microprocessor module; the microprocessor module is connected to a display module, and the user sets the parameters of the electricity meter to be calibrated through the display module and inputs the set parameter information into the microprocessor module; The regulated power supply module is connected to the input end of the electricity meter to be calibrated, and the output end of the electricity meter to be calibrated is connected to the load; a voltage acquisition unit and a current acquisition unit are arranged at the input end of the load; the voltage acquisition unit and the current acquisition unit are respectively connected to the microprocessor module; The pulse signal acquisition module is respectively connected to the electricity meter and the microprocessor module and is used for acquiring the pulse signal of the electric energy; And input the acquired one into the microprocessor module for counting the number of pulses; The microprocessor module calculates the first electric energy according to the parameters of the electricity meter to be calibrated for the number of pulse signals received within the time T, and at the same time calculates the second electric energy according to the voltage acquired by the voltage acquisition unit and the current acquired by the current acquisition unit in combination with the time T, and compares the calculated first electric energy with the second electric energy and outputs the calibration result to the display module.

2. The electric energy meter calibration device according to claim 1, wherein The regulated power supply module includes a battery, the battery is connected with a power supply unit for the electricity meter and a power supply unit for the device, and the power supply unit for the electricity meter and the power supply unit for the device are connected in parallel at both ends of the battery; The power supply unit for the electricity meter is connected to the input end of the electricity meter to be calibrated; The power supply unit for the device is used for supplying power to the pulse signal acquisition module, the microprocessor module, and the display module.

3. The electric energy meter calibration device according to claim 2, characterized in that, The power supply unit for the electricity meter includes a first voltage stabilization circuit and an inverter; The input end of the first voltage stabilization circuit is connected to the battery, the output end of the first voltage stabilization circuit is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the electricity meter to be calibrated.

4. The electric energy meter calibration device according to claim 3, characterized in that, The first voltage stabilization circuit includes a switch unit and a DC-DC chip; The battery is sequentially connected to the input end of the DC-DC chip through the switch unit and the inductor L3, the battery is also grounded through the voltage stabilizing diode D2, one end of the inductor L3 connected to the switch unit is grounded through the capacitor C6, the input end of the DC-DC chip is also grounded through the capacitors C7 and C8 connected in parallel, the output end of the DC-DC chip outputs the power supply Vdc through the inductor L4; the first end of the inductor L4 is connected to the DC-DC chip, the second end of the inductor L4 is connected to the positive input end of the voltage follower through the resistor R9, the positive input end of the voltage follower is also grounded through the resistor R8, the output end of the voltage follower is connected to the feedback end of the DC-DC chip, and the second end of the inductor L4 is also grounded through the capacitor C9; The power supply Vdc is connected to the input end of the electricity meter to be calibrated through the inverter.

5. The electric energy meter calibration device according to claim 4, characterized in that The power supply unit for the device includes a second voltage stabilization circuit and a third voltage stabilization circuit. The input end of the second voltage stabilization circuit is connected to the battery, and the output end of the second voltage stabilization circuit is respectively connected to the pulse signal acquisition module and the microprocessor module to supply power to the pulse signal acquisition module and the microprocessor module; the input end of the third voltage stabilization circuit is connected to the battery, and the output end of the third voltage stabilization circuit is connected to the display module to supply power to the display module.

6. The electric energy meter calibration device according to claim 5, characterized in that, The second voltage stabilization circuit includes a buck chip, an inductor L1, and an inductor L2; The battery is connected to the first end of inductor L1. The second end of inductor L1 is connected to the input terminal of the buck chip. The enable terminal of the buck chip is grounded through resistor R1 and capacitor C1 connected in series, and the enable terminal of the buck chip is also grounded through resistor R2. The second end of inductor L1 is also connected to the connection point of resistor R1 and capacitor C1. The start-up voltage terminal of the buck chip is grounded through capacitor C2, resistor R3 and diode D1 connected in series, where resistor R3 is connected to the cathode of diode D1. The output terminal of the buck chip outputs power supply VCC1 through inductor L2. The output terminal of the buck chip is also connected to the cathode of diode D1. The end of inductor L2 connected to the output terminal of the buck chip is the first end. The second end of inductor L2 is connected to the feedback terminal of the buck chip through resistor R5. Capacitor C3 is connected in parallel across both ends of resistor R5. The feedback terminal of the buck chip is also grounded through resistor R4. The second end of inductor L2 is also grounded through capacitor C4 and capacitor C5 connected in parallel.

7. The electric energy meter calibration device according to claim 6, characterized in that The pulse signal acquisition module includes an optical pulse signal acquisition unit and an electrical pulse signal acquisition unit; The power supply terminals of the optical pulse signal acquisition unit and the electrical pulse signal acquisition unit are respectively connected to the output terminal of the second voltage stabilizing circuit; The pulse signal output terminals of the optical pulse signal acquisition unit and the electrical pulse signal acquisition unit are respectively connected to the microprocessor module.

8. The electric energy meter calibration device according to claim 7, characterized in that, The optical pulse signal acquisition unit includes an optical pulse signal acquisition interface and a first optocoupler; The positive terminal of the optical pulse signal acquisition interface is connected to the anode of the diode of the first optocoupler through resistor R10. The cathode of the diode of the first optocoupler is connected to the negative terminal of the optical pulse signal acquisition interface. The collector of the transistor of the first optocoupler is connected to power supply VCC1. The emitter of the transistor of the first optocoupler is grounded through resistor R11, and the emitter of the transistor of the first optocoupler is also connected to the microprocessor module. Both ends of the diode of the first optocoupler are connected through transient suppression diode D3.

9. The electric energy meter calibration device according to claim 8, characterized in that, The electrical pulse signal acquisition unit includes an electrical pulse signal acquisition interface and a second optocoupler; The positive terminal of the electrical pulse signal acquisition interface is connected to the anode of the diode of the second optocoupler. The cathode of the diode of the first optocoupler is connected to the negative terminal of the electrical pulse signal acquisition interface. The collector of the transistor of the second optocoupler is connected to power supply VCC1. The emitter of the transistor of the second optocoupler is grounded through resistor R13, and the emitter of the transistor of the second optocoupler is also connected to the microprocessor module. Both ends of the diode of the second optocoupler are connected through transient suppression diode D4. The anode of the diode of the second optocoupler is also connected to power supply VCC1 through resistor R12.

10. The electric energy meter calibration device according to claim 9, characterized in that, The display module is a touch screen display module.

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