CN212083563U - High-resolution inter-harmonic online detection circuit - Google Patents
High-resolution inter-harmonic online detection circuit Download PDFInfo
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- CN212083563U CN212083563U CN201922321889.4U CN201922321889U CN212083563U CN 212083563 U CN212083563 U CN 212083563U CN 201922321889 U CN201922321889 U CN 201922321889U CN 212083563 U CN212083563 U CN 212083563U
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Abstract
The utility model provides a high-resolution online detection circuit for inter-harmonics, which comprises a power module, an ABC phase voltage sampling circuit, an ABC phase current sampling circuit, a metering module, an ARM microprocessor module, a clock module, a reset module, a storage module and a 4G communication module; the power supply module is connected with the metering module and the ARM microprocessor module, and the power supply module is configured to supply power to the metering module and the ARM microprocessor module; the metering module is connected with the ABC phase voltage sampling circuit, the ABC phase current sampling circuit and the ARM microprocessor module; the clock module, the reset module, the storage module and the 4G communication module are all connected with the ARM microprocessor module; the circuit is provided with a plurality of functional modules connected with a microprocessor, enriches the functions of the detection circuit, improves the working efficiency, can realize voltage and current inter-harmonic detection with the sampling frequency reaching 1.024MHz and the sampling precision reaching 0.2S level, and realizes 4G wireless transmission of frequency-density inter-harmonic data.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a high resolution's interharmonic on-line measuring circuit.
Background
In an industrial and commercial power distribution system, a harmonic source is easy to amplify voltage flicker and audio interference, affect television pictures and increase radio noise, and cause vibration and abnormality of an induction motor. For passive filter circuits consisting of capacitors, inductors and resistors, inter-harmonics can be amplified, which in severe cases can cause the filter to fail to operate properly due to harmonic overload, or even cause damage. The influence and damage of inter-harmonics are equal to the influence and damage of integer subharmonic voltage; it is necessary to accurately detect inter-harmonics, and accurate data is provided for power quality analysis and management and control.
The general three-phase power parameter detection circuit adopts a conventional electric energy metering chip, has slow sampling frequency and operation speed and low sampling precision, and cannot provide a current and voltage sequence with high precision and high sampling frequency for an inter-harmonic detection system. At present, in order to solve the problems, in the prior art, a metering scheme combining a high-precision ADC and a high-speed DSP is mostly adopted, but the scheme has many defects and cannot accurately and quickly provide inter-harmonic data for other electric energy quality analysis systems; meanwhile, the wireless communication function with large data volume is lacked, and the communication requirement of remote areas cannot be met.
For example, chinese patent publication No. CN discloses an inter-harmonic detection instrument based on a DSP, which has a structure in which three-phase voltages and three-phase currents are connected to a filter circuit through a voltage transformer and a current transformer, respectively; the output end of the filter circuit is respectively connected with the zero-crossing comparison circuit and the A/D sampling circuit; the output end of the zero-crossing comparison circuit is connected with the phase selection switching-on circuit, the output end of the phase selection switching-on circuit is connected with the phase-locking frequency doubling circuit, the output end of the phase-locking frequency doubling circuit is connected with the A/D sampling circuit, and the output end of the A/D sampling circuit is connected with the DSP chip. This patent tests the interharmonic of electric wire netting through adopting the DSP chip, and it lacks the wireless communication function that the data volume is big, can't satisfy the demand.
Therefore, in order to solve the problems in the prior art, it is important to provide an inter-harmonic online detection technique with high sampling frequency, high sampling precision and capability of performing wireless communication of big data.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to avoid the weak point among the prior art, and provide a high resolution' S interharmonic online detection circuit, this circuit can realize that sampling frequency reachs 1.024MHz, and the sampling precision reachs the voltage current interharmonic detection of 0.2S level, and realizes 4G wireless transmission of harmonic data between the frequency density.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the detection circuit comprises a power supply module, an ABC phase voltage sampling circuit, an ABC phase current sampling circuit, a metering module, an ARM microprocessor module, a clock module, a reset module, a storage module, a 4G communication module, an SIM interface module, an antenna and a USB interface module.
The power supply module is connected with the metering module and the ARM microprocessor module, and the power supply module is configured to supply power to the metering module and the ARM microprocessor module;
the metering module is connected with the ABC phase voltage sampling circuit, the ABC phase current sampling circuit and the ARM microprocessor module;
the clock module, the reset module, the storage module, the USB interface module and the 4G communication module are all connected with the ARM microprocessor module;
the SIM module, the antenna and the USB interface module are connected with the 4G communication module;
the ABC phase voltage sampling circuit is configured to receive voltage of three-phase alternating current, divide the voltage, convert the voltage into a low-voltage signal and transmit the low-voltage signal to the metering module;
the ABC phase current sampling circuit is configured to receive current of three-phase alternating current, convert the current into a small current signal through the current transformer, convert the small current signal into a voltage signal through the sampling resistor, and transmit the voltage signal to the metering module;
the metering module is configured to receive voltage signals from the ABC phase voltage sampling circuit and the ABC phase current sampling circuit, sample voltage signal waveforms to obtain discrete waveform data, and send the discrete waveform data to the ARM microprocessor module;
the ARM microprocessor module is configured to receive the discrete waveform data and extract inter-harmonics from the discrete waveform data;
the 4G communication module is configured to send inter-harmonic data sent by the ARM microprocessor module to an external system, such as a power quality detection system;
the clock module is configured to provide a real-time clock signal to the ARM microprocessor module;
the reset module is configured to reset the ARM microprocessor module;
the storage module is configured to provide data storage and operation for the ARM microprocessor module;
the USB interface module is configured to communicate, configure and program the ARM microprocessor module.
In the above, the power supply module includes a plurality of voltage regulators; the power supply module is connected with a +5V power supply, and the +5V power supply voltage outputs 3.3V voltage through the voltage regulator to supply power for the metering module and the ARM microprocessor module.
The voltage regulators comprise three voltage regulators, namely a first voltage regulator, a second voltage regulator and a third voltage regulator; the first voltage regulator is configured to receive a +5V voltage and convert the +5V voltage to output a 3.3V voltage for internal power supply; the second voltage regulator is configured to receive +5V voltage and output 3.3V voltage to the ARM microprocessor module, an output pin of the second voltage regulator is connected with the third voltage regulator, and the third voltage regulator is configured to receive 3.3V voltage and output 3.3V working voltage to the metering module.
Specifically, the power supply module provides a stable and reliable working power supply for each functional module.
Preferably, the model of the first voltage regulator is MIC 29302; the model of the second voltage regulator is AMS 1117-3.3; the third voltage regulator is SPX3819M 5-L.
The ABC phase voltage sampling circuit comprises three sub-circuits with the same circuit structure; each sub-circuit comprises a voltage input end, and a first resistor, a second resistor, a third resistor and a fourth resistor which are connected in series; one end of the first resistor, which is not connected, is connected with a voltage input end, and one end of the fourth resistor, which is not connected, is connected with a zero line N; a lead at the joint of the third resistor and the fourth resistor is connected with the metering module; the ABC phase voltage sampling circuit converts the collected high voltage signals of the three-phase voltage into low voltage signals and transmits the low voltage signals to the metering module;
preferably, the first resistor, the second resistor, the third resistor and the fourth resistor are all precision sampling resistors, the temperature coefficient of the precision sampling resistors is 10 PPm/DEG C, and the precision is 0.1%.
Specifically, the ABC phase voltage sampling circuit has three sub-circuits with the same circuit structure, specifically, an a-phase voltage circuit, a B-phase voltage circuit and a C-phase voltage circuit, for receiving three-phase voltages of three-phase alternating current; the first resistor, the second resistor, the third resistor and the fourth resistor are connected in series to form a resistor voltage division network, and voltage is converted into a low-voltage signal after voltage division and is input to the metering module.
The ABC phase current sampling circuit comprises three sub-circuits with the same circuit structure; each sub-circuit comprises a current input end, a precision current transformer and two sampling resistors, wherein the two sampling resistors are a first sampling resistor and a second sampling resistor respectively; the precision current transformer comprises P1, P2, S1 and S2 terminals; the ends P1 and P2 of the precision current transformer are connected with a current input end, the end S1 of the precision current transformer is connected with a first sampling resistor, the other end of the first sampling resistor is connected with a second sampling resistor, and the other end of the second sampling resistor is connected with the end S2 of the precision current transformer;
the junction of the first sampling resistor and the second sampling resistor is grounded through a lead, the junction of the first sampling resistor and the S1 end of the precision current transformer is connected with the metering module through a lead, and the junction of the second sampling resistor and the S2 end of the precision current transformer is connected with the metering module through a lead, so that the ABC three-phase current sampling circuit transmits voltage signals to the metering module.
Specifically, the ABC three-phase current sampling circuit has three sub-circuits with the same circuit structure, specifically, an a-phase current circuit, a B-phase current circuit and a C-phase current circuit, which are used for receiving three-phase current of three-phase alternating current; the current signal passes through the current input end, then flows through the precision current transformer, is converted into a small current signal, then passes through the sampling resistor, is converted into a low voltage signal, and is transmitted to the metering module.
Specifically, the precision current transformer is a non-core-through current transformer.
In the above, the metering module includes a metering chip and a pulse checking circuit; the metering chip comprises a first voltage interface, a second voltage interface, a pulse checking interface and an output interface; the first voltage interface is connected with the ABC three-phase current sampling circuit and used for receiving voltage signals of the ABC three-phase current sampling circuit; the second voltage interface is connected with the ABC three-phase voltage sampling circuit and used for receiving voltage signals of the ABC three-phase voltage sampling circuit; the output interface is connected with the ARM microprocessor module through an HSDC bus (High Speed Data Capture) to transmit discrete waveform Data to the ARM microprocessor module;
the pulse verification interface is connected with the pulse verification circuit to realize accurate verification of pulses.
Preferably, the model of the metering chip is ADE 7878.
Specifically, the type of the metering chip adopts ADE7878, the precision level of data acquisition is as high as 0.2S precision, a 24-bit sampling value is output, and the high-resolution metering chip has extremely high resolution. The metering chip converts the acquired voltage signals into digital quantity through an analog-to-digital conversion module in the chip, and then the digital quantity is calculated through a DSP module of the chip, and then the data is transmitted in real time through an HSDC bus of the metering chip and an ARM microprocessor module.
The pulse checking circuit comprises two sub-circuits with the same structure, wherein each sub-circuit comprises a first PMOS (P-channel metal oxide semiconductor) tube, a second PMOS tube, an NMOS (N-channel metal oxide semiconductor) tube and an optical coupler; the grid electrode of the first PMOS tube is connected with a pulse check interface of the microprocessor, the source electrode of the first PMOS tube is connected with the power module, the drain electrode of the first PMOS tube is grounded, the grid electrode of the NMOS tube is connected with the drain electrode of the first PMOS tube, the source electrode of the NMOS tube is grounded, the drain electrode of the NMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the second PMOS tube is connected with the power module, the second PMOS tube is connected with the anode of the diode of the optical coupler, the cathode of the diode of the optical coupler is grounded, and the collector electrode.
Preferably, the model of the first PMOS tube is SI2301, the model of the second PMOS tube is BSS84-7-F, and the model of the NMOS tube is SI 2302.
The ARM microprocessor module comprises a microprocessor, wherein the microprocessor comprises an input port connected with the metering chip and a transmission port connected with the reset module, the clock module, the USB interface module, the storage module and the 4G communication module; and the input port of the microprocessor is connected with the metering chip through an HSDC bus.
After the microprocessor extracts inter-harmonics from the received discrete waveform data, the inter-harmonics are transmitted to the 4G communication module through a transmission port connected with the 4G communication module, so that inter-harmonic data can be transmitted.
Preferably, the microprocessor is of the model STM32F 407V.
Specifically, the ARM microprocessor module extracts inter-harmonics from discrete waveform data provided by the metering chip; the clock module provides a real-time clock for the ARM chip, and the reset module can reset the microprocessor in an error logic state, so that the circuit jumps out of the error logic state, and the normal operation of the circuit is guaranteed.
The storage module comprises a Flash chip and an SD card, and the Flash chip and the SD card are both connected with a transmission port of the microprocessor to realize the operation and storage of data provided for the microprocessor.
And the microprocessor is connected with the 4G communication module and the USB interface module through the USB bus to realize bidirectional connection.
Specifically, the SIM interface module and the antenna are both connected with the 4G communication module; the 4G communication module realizes a wireless networking function, can send inter-harmonic detection results to a power quality monitoring system, and realizes 4G wireless transmission of inter-frequency harmonic data.
The utility model has the advantages that:
the utility model provides a high resolution's interharmonic on-line measuring circuit, it is provided with the multiple function module who is connected with microprocessor, has richened detection circuitry's function to improve its work efficiency. The adoption of the metering chip enables the detection circuit to have high sampling resolution and high sampling precision; the 4G communication module and the storage module are arranged, so that the circuit has a communication function, and wireless transmission and storage of big data are realized; the microprocessor extracts inter-harmonic information through discrete waveform data output by the metering chip and then sends the inter-harmonic information to the outside through the communication module to realize information transmission. The circuit has the advantages of simple structure, rich functions, high sampling resolution, high sampling precision and high working efficiency, and is more energy-saving.
Drawings
Fig. 1 is a schematic diagram of a circuit module connection of a detection circuit provided by the present invention;
fig. 2 is a schematic diagram of a power module circuit connection of the detection circuit provided by the present invention;
FIG. 3 is a schematic diagram of the ABC phase voltage sampling circuit connection of the detection circuit provided by the present invention;
FIG. 4 is a schematic diagram of the ABC phase current sampling circuit connection of the detection circuit provided by the present invention;
fig. 5 is a schematic diagram of a circuit connection of a metering module of the detection circuit according to the present invention;
fig. 6 is a schematic diagram of the circuit connection of the ARM microprocessor module of the detection circuit according to the present invention;
fig. 7 is a schematic diagram of a clock module circuit connection of the detection circuit according to the present invention;
fig. 8 is a schematic diagram of a reset module circuit connection of the detection circuit according to the present invention;
fig. 9 is a schematic diagram of a circuit connection of a memory module of the detection circuit according to the present invention;
fig. 10 is a schematic diagram of a circuit connection of the 4G communication module of the detection circuit according to the present invention;
fig. 11 is a schematic diagram of a circuit connection of the SIM interface module of the detection circuit according to the present invention;
fig. 12 is a schematic diagram of a USB interface module circuit connection of the detection circuit according to the present invention;
fig. 13 is a schematic diagram of a pin of a microprocessor portion of the detection circuit according to the present invention.
Detailed Description
The following describes the present invention with reference to the accompanying drawings.
As shown in fig. 1 to 13, the detection circuit includes a power module 1, an ABC phase voltage sampling circuit 2, an ABC phase current sampling circuit 3, a metering module 4, an ARM microprocessor module 5, a clock module 6, a reset module 7, a storage module 8, a 4G communication module 9, an SIM interface module 10, an antenna 11, and a USB interface module 12.
The power supply module 1 is connected with the metering module 4 and the ARM microprocessor module 5, and the power supply module 1 is configured to supply power to the metering module 4 and the ARM microprocessor module 5; the metering module 4 is connected with the ABC phase voltage sampling circuit 2, the ABC phase current sampling circuit 3 and the ARM microprocessor module 5; the clock module 6, the reset module 7, the storage module 8, the USB interface module 12 and the 4G communication module 9 are all connected with the ARM microprocessor module 5; the SIM module, the antenna 11 and the USB interface module 12 are connected with the 4G communication module 9;
the ABC phase voltage sampling circuit 2 is configured to receive the voltage of three-phase alternating current, divide the voltage, convert the voltage into a low-voltage signal and transmit the low-voltage signal to the metering module 4;
as shown in FIG. 3, the ABC phase voltage sampling circuit 2 comprises three subcircuits with the same circuit structure; each sub-circuit comprises a voltage input end, and a first resistor R30, a second resistor R31, a third resistor R32 and a fourth resistor R39 which are connected in series; the unconnected end of the first resistor R30 is connected with a voltage input end, and the unconnected end of the fourth resistor R39 is connected with a zero line N; the junction of the third resistor R32 and the fourth resistor R39 is connected with the metering module 4 through a lead; the ABC phase voltage sampling circuit 2 converts the collected high voltage signals of the three-phase voltage into low voltage signals and transmits the low voltage signals to the metering module 4;
to better illustrate the structure of the ABC phase voltage sampling circuit, specifically, as shown in fig. 3, a total of three sub-circuits are provided, and a first sub-circuit a-phase voltage circuit is taken as an example for illustration, which includes a voltage input terminal UA, and a first resistor R30, a second resistor R31, a third resistor R32, and a fourth resistor R39 connected in series; one end of the first resistor R30, which is not connected, is connected with a voltage input end UA, and one end of the fourth resistor R39, which is not connected, is connected with a zero line UN; a lead at the connection position of the third resistor R32 and the fourth resistor R39 is connected with a VAP pin of the metering chip, so that a voltage signal is transmitted to the metering chip from the ABC phase voltage sampling circuit; the other two sub-circuits, i.e., the B-phase voltage circuit, the C-phase voltage circuit and the a-phase voltage circuit, have the same structure, and therefore, the detailed connection relationship thereof will not be described herein.
In this embodiment, the first resistor R30, the second resistor R31, the third resistor R32, and the fourth resistor R39 are all precision sampling resistors, the temperature coefficient thereof is 10 PPm/degree c, and the precision thereof is 0.1%.
Specifically, the ABC phase voltage sampling circuit 2 has three sub-circuits with the same circuit structure, specifically, an a-phase voltage circuit, a B-phase voltage circuit, and a C-phase voltage circuit, which are used for receiving three-phase voltages of three-phase alternating current; and the first resistor R30/R33/R36, the second resistor R31/R34/R37, the third resistor R32/R35/R38 and the fourth resistor R39/R40/R41 are connected in series to form a resistor voltage division network, and voltage is divided and converted into a low-voltage signal to be input to the metering module 4.
The ABC phase current sampling circuit 3 is configured to receive current of three-phase alternating current, convert the current into a small current signal through a current transformer, convert the small current signal into a voltage signal through a sampling resistor, and transmit the voltage signal to the metering module 4;
as shown in fig. 4, the ABC phase current sampling circuit 3 includes three sub-circuits of the same circuit configuration; each sub-circuit comprises a current input end, a precision current transformer and two sampling resistors, wherein the two sampling resistors are a first sampling resistor and a second sampling resistor respectively; the precision current transformer comprises P1, P2, S1 and S2 terminals; the ends P1 and P2 of the precision current transformer are connected with a current input end, the end S1 of the precision current transformer is connected with a first sampling resistor, the other end of the first sampling resistor is connected with a second sampling resistor, and the other end of the second sampling resistor is connected with the end S2 of the precision current transformer;
the connection part of the first sampling resistor and the second sampling resistor is grounded through a lead, the connection part of the first sampling resistor and the S1 end of the precision current transformer is connected with the metering module 4 through a lead, and the connection part of the second sampling resistor and the S2 end of the precision current transformer is connected with the metering module 4 through a lead, so that the ABC three-phase current sampling circuit transmits voltage signals to the metering module 4.
To better illustrate the structure of the ABC phase current sampling circuit, specifically, as shown in fig. 4, a total of three sub-circuits are provided, and a first sub-circuit a-phase current circuit is taken as an example for description, and includes current input terminals IA-, IA +, a precision current transformer T1, a first sampling resistor R42, and a second sampling resistor R43; the precision current transformer T1 comprises P1, P2, S1 and S2 ends; the P1 and the P2 of the precision current transformer T1 are respectively connected with current input ends IA-IA +, S1 of the precision current transformer T1 is connected with a first sampling resistor R42, the other end of the first sampling resistor R42 is connected with a second sampling resistor R43, and the other end of the second sampling resistor R43 is connected with the S2 end of the precision current transformer; the connection part of the first sampling resistor R42 and the second sampling resistor R42 is grounded, the connection part of the first sampling resistor R42 and the end of the precision current transformer S1 is connected with the metering module 4, the connection part of the second sampling resistor R43 and the end of the precision current transformer S2 is connected with the metering module 4, and the other two sub-circuits, namely the B-phase current circuit and the C-phase current circuit, are consistent in structure with the A-phase current circuit, so the specific connection relation is not repeated herein.
In the present embodiment, the precision current transformer T1 is a non-feedthrough current transformer.
The metering module 4 is configured to receive voltage signals from the ABC phase voltage sampling circuit 2 and the ABC phase current sampling circuit 3, sample voltage signal waveforms to obtain discrete waveform data, and send the discrete waveform data to the ARM microprocessor module 5;
as shown in fig. 5, the metering module 4 includes a metering chip ADE7878 and a pulse verification circuit; the metering chip comprises a first voltage interface (pins 7-14), a second voltage interface (pins 19, 22 and 23), a pulse checking interface (pins 33 and 34) and an output interface (pins 35-39); the first voltage interface (pins 7-14) is connected with the ABC three-phase current sampling circuit and used for receiving voltage signals of the ABC three-phase current sampling circuit; the second voltage interface (pins 19, 22 and 23) is connected with the ABC three-phase voltage sampling circuit and is used for receiving voltage signals of the ABC three-phase voltage sampling circuit; the output interface (pins 35-39) is connected with the ARM microprocessor module 5 through an HSDC bus to transmit the discrete waveform data to the ARM microprocessor module 5;
the pulse verification interface (pins 33, 34) is connected with the pulse verification circuit to realize accurate verification of the pulse. Specifically, the type of the metering chip adopts ADE7878, the precision level of data acquisition is as high as 0.2S precision, a 24-bit sampling value is output, and the high-resolution metering chip has extremely high resolution. The metering chip converts the acquired voltage signals into digital quantity through an analog-to-digital conversion module in the chip, and then the digital quantity is calculated through a DSP module of the chip, and then the data is transmitted in real time through an HSDC bus of the metering chip and an ARM microprocessor module 5.
As shown in fig. 5, the pulse verification circuit includes two sub-circuits with the same structure, where each sub-circuit includes a first PMOS transistor, a second PMOS transistor, an NMOS transistor, and an optical coupler; the grid electrode of the first PMOS tube is connected with a pulse check interface of the microprocessor, the source electrode of the first PMOS tube is connected with the power module 1, the drain electrode of the first PMOS tube is grounded, the grid electrode of the NMOS tube is connected with the drain electrode of the first PMOS tube, the source electrode of the NMOS tube is grounded, the drain electrode of the NMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the second PMOS tube is connected with the power module 1, the second PMOS tube is connected with the anode of a diode of the optical coupler, the cathode of the diode of the optical coupler is grounded, and the collector electrode.
To better illustrate the sub-circuit structure of the pulse checking circuit, as shown in fig. 5, there are two sub-circuits in total, and the first sub-circuit is taken as an example for illustration and includes a first PMOS transistor M1, a second PMOS transistor M6, an NMOS transistor M2, and an optocoupler U9; the grid of the first PMOS tube M1 is connected with a pulse verification interface of the microprocessor, the source of the first PMOS tube M1 is connected with the power module 1, the drain of the first PMOS tube M1 is grounded, the grid of the NMOS tube M2 is connected with the drain of the first PMOS tube M1, the source of the NMOS tube M2 is grounded, the drain of the NMOS tube M2 is connected with the grid of the second PMOS tube M6, the drain of the second PMOS tube M6 is connected with the power module 1, the second PMOS tube M6 is connected with the anode of the diode of the optical coupler U9, the cathode of the diode of the optical coupler U9 is grounded, and the collector and the emitter of the optical coupler U9 are used. The circuit structures of the second sub-circuits are identical, and therefore, the detailed connection relationship thereof is not repeated herein.
In the embodiment, the model of the first PMOS tube is SI2301, the model of the second PMOS tube is BSS84-7-F, and the model of the NMOS tube is SI 2302.
The ARM microprocessor module 5 is configured to receive the discrete waveform data and extract inter-harmonics from the discrete waveform data; the 4G communication module 9 is configured to send inter-harmonic data sent by the ARM microprocessor module 5 to the power quality detection system; the clock module 6 is configured to provide a real-time clock signal to the ARM microprocessor module 5; the reset module 7 is configured to reset the ARM microprocessor module 5; the storage module 8 is configured to provide data storage and operation for the ARM microprocessor module 5; the USB interface module 12 is configured to communicate, configure and program the ARM microprocessor module 5.
As shown in fig. 6, the ARM microprocessor module 5 includes a microprocessor STM32F407V, the microprocessor STM32F407V includes input ports (pins 51, 52, 54, 92, 93) connected to the metering chip, and transmission ports (see fig. 6 in particular) connected to the reset module 7, the clock module 6, the USB interface module 12, the storage module 8, and the 4G communication module 9; the input ports (pins 51, 52, 54, 92, 93) of the microprocessor are connected to the metrology chip via an HSDC bus.
After the microprocessor extracts inter-harmonics from the received discrete waveform data, the inter-harmonics are transmitted to the 4G communication module 9 through a transmission port connected with the 4G communication module 9, so that inter-harmonic data can be transmitted. The ARM microprocessor module 5 extracts inter-harmonics from the discrete waveform data provided by the metering chip; the clock module 6 provides a real-time clock for the ARM chip, and the reset module 7 can reset the microprocessor in an error logic state, so that the circuit jumps out of the error logic, and the normal operation of the circuit is guaranteed.
As shown in fig. 2, the power supply module 1 includes three voltage regulators, i.e., a first voltage regulator U4, a second voltage regulator U12, and a third voltage regulator U6; the first voltage regulator U4 is configured to receive +5V voltage and convert the +5V voltage to output 3.3V voltage for internal power supply; the second voltage regulator U12 is configured to receive +5V voltage and output 3.3V voltage to the ARM microprocessor module 5, an output pin of the second voltage regulator U12 is connected to a third voltage regulator U6, and the third voltage regulator U6 is configured to receive 3.3V voltage and output 3.3V operating voltage to the metering module 4. The power module 1 provides a stable and reliable working power supply for each functional module.
In this embodiment, the model of the first voltage regulator U4 is MIC 29302; the model of the second voltage regulator U12 is AMS 1117-3.3; the model of the third voltage regulator U6 is SPX3819M 5-L.
As shown in fig. 9, the storage module 8 includes a Flash chip U8 and an SD card, and both the Flash chip U8 and the SD card are connected to a transmission port of the microprocessor to implement data operation and storage provided for the microprocessor. As shown in fig. 1, the microprocessor is connected to the 4G communication module 9 and the USB interface module 12 through a USB bus, so as to implement bidirectional connection. The SIM interface module 10 and the antenna 11 are both connected with the 4G communication module 9; the 4G communication module 9 realizes a wireless networking function, can send inter-harmonic detection results to a power quality monitoring system, and realizes 4G wireless transmission of inter-frequency-density harmonic data.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The high-resolution inter-harmonic online detection circuit is characterized by comprising a power supply module, an ABC phase voltage sampling circuit, an ABC phase current sampling circuit, a metering module, an ARM microprocessor module, a clock module, a reset module, a storage module and a 4G communication module;
the power supply module is connected with the metering module and the ARM microprocessor module, and the power supply module is configured to supply power to the metering module and the ARM microprocessor module;
the metering module is connected with the ABC phase voltage sampling circuit, the ABC phase current sampling circuit and the ARM microprocessor module;
the clock module, the reset module, the storage module and the 4G communication module are all connected with the ARM microprocessor module;
the ABC phase voltage sampling circuit is configured to receive voltage of three-phase alternating current, divide the voltage, convert the voltage into a low-voltage signal and transmit the low-voltage signal to the metering module;
the ABC phase current sampling circuit is configured to receive current of three-phase alternating current, convert the current into a small current signal through the current transformer, convert the small current signal into a voltage signal through the sampling resistor, and transmit the voltage signal to the metering module;
the metering module is configured to receive voltage signals from the ABC phase voltage sampling circuit and the ABC phase current sampling circuit, sample voltage signal waveforms to obtain discrete waveform data, and send the discrete waveform data to the ARM microprocessor module;
the ARM microprocessor module is configured to receive the discrete waveform data and extract inter-harmonics from the discrete waveform data; the 4G communication module is configured to send inter-harmonic data sent by the ARM microprocessor module to an external system;
the clock module is configured to provide a real-time clock signal to the ARM microprocessor module; the reset module is configured to reset the ARM microprocessor module; the storage module is configured to provide data storage and operation for the ARM microprocessor module.
2. The detection circuit of claim 1, further comprising a SIM interface module, an antenna, and a USB interface module; the SIM module and the antenna are connected with the 4G communication module;
the USB interface module is connected with the 4G communication module and the ARM microprocessor module; the USB interface module is configured to communicate, configure and program the ARM microprocessor module.
3. The detection circuit according to claim 1 or 2, wherein the power supply module comprises a plurality of voltage regulators; the voltage regulators comprise three voltage regulators, namely a first voltage regulator, a second voltage regulator and a third voltage regulator; the first voltage regulator is configured to receive a +5V voltage and convert the +5V voltage to output a 3.3V voltage for internal power supply; the second voltage regulator is configured to receive +5V voltage and output 3.3V voltage to the ARM microprocessor module, an output pin of the second voltage regulator is connected with the third voltage regulator, and the third voltage regulator is configured to receive 3.3V voltage and output 3.3V working voltage to the metering module.
4. The detection circuit of claim 3, wherein the first voltage regulator is of the MIC29302 type; the model of the second voltage regulator is AMS 1117-3.3; the third voltage regulator is SPX3819M 5-L.
5. The detection circuit of claim 1 or 2, wherein the ABC phase voltage sampling circuit comprises three identical circuit configuration sub-circuits; each sub-circuit comprises a voltage input end, and a first resistor, a second resistor, a third resistor and a fourth resistor which are connected in series; one end of the first resistor, which is not connected, is connected with a voltage input end, and one end of the fourth resistor, which is not connected, is connected with a zero line N; and a lead at the joint of the third resistor and the fourth resistor is connected with the metering module.
6. The detection circuit of claim 1 or 2, wherein the ABC phase current sampling circuit comprises three identical circuit-configured subcircuits; each sub-circuit comprises a current input end, a precision current transformer and two sampling resistors, wherein the two sampling resistors are a first sampling resistor and a second sampling resistor respectively; the precision current transformer comprises P1, P2, S1 and S2 terminals; the ends P1 and P2 of the precision current transformer are connected with a current input end, the end S1 of the precision current transformer is connected with a first sampling resistor, the other end of the first sampling resistor is connected with a second sampling resistor, and the other end of the second sampling resistor is connected with the end S2 of the precision current transformer;
the junction of the first sampling resistor and the second sampling resistor is grounded through a lead, the junction of the first sampling resistor and the S1 end of the precision current transformer is connected with the metering module through a lead, and the junction of the second sampling resistor and the S2 end of the precision current transformer is connected with the metering module through a lead, so that the ABC three-phase current sampling circuit transmits voltage signals to the metering module.
7. The detection circuit of claim 1 or 2, wherein the metering module comprises a metering chip and a pulse verification circuit;
the metering chip comprises a first voltage interface, a second voltage interface, a pulse checking interface and an output interface; the first voltage interface is connected with the ABC three-phase current sampling circuit and used for receiving voltage signals of the ABC three-phase current sampling circuit; the second voltage interface is connected with the ABC three-phase voltage sampling circuit and used for receiving voltage signals of the ABC three-phase voltage sampling circuit; the output interface is connected with the ARM microprocessor module through an HSDC bus so as to transmit discrete waveform data to the ARM microprocessor module; the pulse verification interface is connected with the pulse verification circuit.
8. The detection circuit of claim 7, wherein the pulse verification circuit comprises two sub-circuits of the same configuration, wherein each sub-circuit comprises a first PMOS transistor, a second PMOS transistor, an NMOS transistor and an optical coupler; the grid electrode of the first PMOS tube is connected with a pulse check interface of the microprocessor, the source electrode of the first PMOS tube is connected with the power module, the drain electrode of the first PMOS tube is grounded, the grid electrode of the NMOS tube is connected with the drain electrode of the first PMOS tube, the source electrode of the NMOS tube is grounded, the drain electrode of the NMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the second PMOS tube is connected with the power module, the second PMOS tube is connected with the anode of the diode of the optical coupler, the cathode of the diode of the optical coupler is grounded, and the collector electrode.
9. The detection circuit according to claim 1 or 2, wherein the ARM microprocessor module comprises a microprocessor, the microprocessor comprises an input port connected with the metering chip, and a transmission port connected with the reset module, the clock module, the USB interface module, the storage module and the 4G communication module; the input port of the microprocessor is connected with the metering chip through an HSDC bus;
after the microprocessor extracts the inter-harmonics from the received discrete waveform data, the discrete waveform data are transmitted to the 4G communication module through a transmission port connected with the 4G communication module.
10. The detection circuit according to claim 9, wherein the storage module comprises a Flash chip and an SD card, both of which are connected to a transmission port of the microprocessor; and the microprocessor is connected with the 4G communication module and the USB interface module through a USB bus.
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| CN201922321889.4U CN212083563U (en) | 2019-12-20 | 2019-12-20 | High-resolution inter-harmonic online detection circuit |
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| CN201922321889.4U CN212083563U (en) | 2019-12-20 | 2019-12-20 | High-resolution inter-harmonic online detection circuit |
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