CN215493887U - Wireless double-core variable-frequency power quality analyzer - Google Patents

Abstract

The utility model provides a wireless double-core variable-frequency power quality analyzer, and belongs to the technical field of power quality analyzers. The device comprises a shell and a controller, wherein the controller is arranged in the shell, the top of the shell is provided with a wire inlet end, the bottom of the shell is provided with an output end, the front side of the shell is provided with an indicator lamp, an antenna interface and an infrared communication interface, the controller comprises a power supply distribution module, a current and voltage measurement sampling module, a data processing module, a micro-processing module and a communication module, through AD measurement sampling, DSP data processing, ARM control, gather analysis voltage range 0 ~ 600v, electric current range 0 ~ 1000A, signal frequency range 0 ~ 1000Hz 'S electric energy information, the degree of accuracy grade 0.5S level, wide range electric energy information gathers can be more comprehensive to electric energy quality analysis, the analysis result is uploaded to the host computer with LORA wireless communication mode or 485 communication' S mode, the unable accurate collection of present frequency conversion electric energy signal has been solved, the difficult problem of analysis, the suitable operating mode of device has been widened to LORA wireless communication mode.

Description

Wireless double-core variable-frequency power quality analyzer

Technical Field

The utility model relates to the technical field of power quality analyzers, in particular to a wireless double-core variable-frequency power quality analyzer.

Background

With the rapid speed of scientific technology and national economy, the requirements of various industrial productions on the electric energy quality of an electric power system are higher and higher. If various indexes of the electric energy quality deviate from the national specified level, different degrees of harm can be brought to the electric equipment. In recent years, the use of intelligent power electronic devices and nonlinear loads in large quantities causes the pollution of electric energy to become more and more serious, and the quality of the electric energy becomes a problem which is increasingly concerned by power departments and users thereof. The good electric energy quality is a necessary condition for economic, stable and safe operation of the electric power system, and has important significance for the overall economic benefit of the nation and the sustainable development of industrial production.

The existing products, such as the PQ116-2 power quality analyzer of shanghai bao gang gao, the ACR230ELH harmonic analyzer of shanghai kairui, and the power analyzer of anhui happy technology, mainly measure and analyze the voltage, current, active power, reactive power, apparent power, power factor, harmonic and other parameters of national grid power frequency signals (50 Hz). The product that relates to frequency conversion signal analysis, the kind is less to there are analysis parameter incomplete, the degree of accuracy is low (1 level), the installation is inconvenient, data monitoring scheduling problem not in real time.

SUMMERY OF THE UTILITY MODEL

In order to make up for the defects, the utility model provides a wireless double-core variable-frequency power quality analyzer, which adopts a DSP + ARM dual-core hardware platform design, and can acquire and analyze power information with a voltage range of 0-600V, a current range of 0-1000A and a signal frequency range of 0-1000 Hz, an accuracy level of 0.5S, and the acquisition of wide-range power information is closer to various operating conditions on site, so that the power quality can be analyzed more comprehensively.

The utility model is realized by the following steps:

the utility model provides a wireless twin-core frequency conversion electric energy quality analysis appearance, includes casing and controller, the controller set up in the inside of casing.

The top of casing is provided with the inlet wire end, the bottom of casing is provided with the output, the output includes 485 interfaces and measures the interface, the front side of casing is provided with pilot lamp, antenna interface and infrared communication interface.

The controller comprises a power supply distribution module, a current and voltage metering and sampling module, a data processing module, a micro-processing module and a communication module, the input end of the power distribution module is connected with the incoming line end and is externally connected with a power supply, the output end of the power distribution module is divided into two paths, one path is respectively and electrically connected with the current and voltage metering sampling module, the data processing module, the micro-processing module and the communication module, the other path provides a negative power supply for the operational amplifier, the input end of the current and voltage metering sampling module is connected with the wire inlet end and is connected with the input voltage, the output end of the current and voltage metering and sampling module is electrically connected with the input end of the data processing module, the output end of the data processing module is electrically connected with the input end of the micro-processing module, and the output end of the micro-processing module is electrically connected with the input end of the communication module.

In an embodiment of the present invention, the power distribution module includes a flyback switch module and a power conversion module, and an output terminal of the flyback switch module is electrically connected to an input terminal of the power conversion module.

In an embodiment of the present invention, the flyback switch module includes a protection module, a high-frequency transformer coupling module, a dc power output module, and a monitoring circuit module, the protection module is disposed at a front end of the high-frequency transformer coupling module, the high-frequency transformer coupling module includes two sets of primary coils and secondary coils, one set of the secondary coils is electrically connected to the dc power output module, and the monitoring circuit module includes a switch power chip and a feedback circuit.

In an embodiment of the present invention, the current-voltage metering sampling module includes a 2.4M resistor string, a current-type voltage transformer, a sampling resistor, and a gain amplifier, an input voltage signal enters the current-type voltage transformer after passing through the 2.4M resistor string, an output end of the current-type voltage transformer passes through the sampling resistor, is amplified by the gain amplifier by 100 times, and is input to a chip voltage sampling pin of the current-voltage metering sampling module, and an input current signal passes through the current-type voltage transformer, is amplified by the gain amplifier by 6.2 times, and is input to the chip current sampling pin of the current-voltage metering sampling module.

In an embodiment of the present invention, the communication module includes an RS485 communication module, an LORA wireless communication module, and an infrared communication module, the RS485 communication module is electrically connected to the 485 interface, the LORA wireless communication module is electrically connected to the antenna interface, and the infrared communication module is electrically connected to the infrared communication interface.

In an embodiment of the present invention, the default communication rate of the RS485 communication module and the LORA wireless communication module is 2400 bits/s, the default communication rate of the infrared communication module is 1200 bits/s, and the interface communication follows the DL/T645-2007 protocol.

In an embodiment of the present invention, the measurement interface is externally connected to a dedicated measurement instrument, and measures and analyzes active power and reactive power parameters of the power quality.

In an embodiment of the present invention, an input end of the microprocessor module is accessed to a user instruction, an output end of the microprocessor module is accessed to a group of communication modules in the communication module correspondingly to upload monitoring analysis data, the microprocessor module is an ARM processor, and a chip model is STM32F103RCT 6.

In one embodiment of the utility model, the current and voltage metering sampling module is an AD sampling module, and has 8 groups of sampling channels, and the core chip is ADC 7606B.

In an embodiment of the utility model, the data processing module is connected with the current and voltage metering sampling module by an SPI parallel data line, the data processing module is processed by a DSP, and the chip model is STM32F429VET 6.

The wireless double-core variable-frequency power quality analyzer has the beneficial effects that:

(1) through AD sampling, DSP data processing and ARM control, the electric energy quality analysis of high-voltage, large-current and variable-frequency signals (0-1000 Hz) is realized, the accuracy grade is 0.5S grade, and the problem that the existing variable-frequency electric energy signals cannot be accurately acquired and analyzed is solved;

(2) the data are uploaded to an upper computer in an LORA wireless communication mode or a 485 communication mode for data monitoring and analysis, wiring is not needed on site, and the application working condition of the analyzer is widened in the LORA wireless communication mode;

(3) the AD sampling part and the DSP data processing module adopt parallel data transmission, and compared with a traditional analyzer, the transmission rate is improved by 16 times.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a wireless dual-core variable frequency power quality analyzer disclosed in an embodiment of the present invention;

fig. 2 is a communication connection diagram of a wireless dual-core variable frequency power quality analyzer according to an embodiment of the present invention;

FIG. 3 is a circuit diagram of a power distribution module according to an embodiment of the disclosure;

FIG. 4 is a circuit diagram of an output branch of a power distribution module according to an embodiment of the disclosure;

FIG. 5 is a circuit diagram of a current-voltage measurement sampling module according to an embodiment of the present disclosure;

FIG. 6 is a circuit diagram of 8 sets of sampling channels according to the embodiment of the present invention;

FIG. 7 is a circuit diagram of the current-voltage input disclosed in the present embodiment;

FIG. 8 is a circuit diagram of a data processing module 1 according to an embodiment of the present invention;

FIG. 9 is a circuit diagram of a data processing module according to an embodiment of the present invention;

FIG. 10 is a circuit diagram of a data processing module according to an embodiment of the present invention;

FIG. 11 is a circuit diagram of a data processing module according to an embodiment of the present invention;

FIG. 12 is a circuit diagram of a data processing module according to an embodiment of the present invention;

FIG. 13 is a circuit diagram of a data processing module according to an embodiment of the present invention;

FIG. 14 is a circuit diagram of a microprocessor module according to an embodiment of the present invention;

FIG. 15 is a circuit diagram of a microprocessor module according to an embodiment of the present invention;

FIG. 16 is a circuit diagram of a microprocessor module according to an embodiment of the present invention;

fig. 17 is a circuit diagram of a LORA wireless communication module according to an embodiment of the present disclosure;

fig. 18 is a circuit diagram of an RS485 communication module disclosed in an embodiment of the present invention;

fig. 19 is a circuit diagram of an infrared communication module disclosed in an embodiment of the present invention;

in the figure: 100-a housing; 101-a line incoming end; 102-an output terminal; 1021-485 interface; 1022 — a measurement interface; 103-an indicator light; 104-an antenna interface; 105-an infrared communication interface; 200-a controller; 201-power distribution module; 2011-flyback switch module; 20111-protection module; 20112-high frequency voltage transformation coupling module; 20113-DC power supply output module; 20114-monitoring circuit module; 2012-power conversion module; 202-a current and voltage metering sampling module; 2021-2.4M resistor string; 2022-current mode voltage sensor; 2023-sampling resistance; 2024-gain amplifier; 203-a data processing module; 204-a micro-processing module; 205-a communication module; 2051-RS485 communication module; 2052-LORA wireless communication module; 2053-infrared communication module.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Examples

Referring to fig. 1-19, the present invention provides a technical solution: a wireless double-core variable frequency power quality analyzer comprises a shell 100 and a controller 200, wherein the controller 200 is arranged inside the shell 100.

Referring to fig. 1, a wire inlet end 101 is disposed at the top of a housing 100, an output end 102 is disposed at the bottom of the housing 100, the output end 102 includes a 485 interface 1021 and a measurement interface 1022, an indicator light 103, an antenna interface 104 and an infrared communication interface 105 are disposed at the front side of the housing 100, the housing 100 is used for installing a controller 200, and a detection wire is connected through the wire inlet end 101 disposed on the housing 100 to input current and voltage signals, and the indicator light 103 is convenient for observing the operation conditions of the input wire and the detection wire.

Referring to fig. 2-19, the controller 200 includes a power distribution module 201, a current and voltage metering and sampling module 202, a data processing module 203, a micro processing module 204 and a communication module 205, an input end of the power distribution module 201 is connected to the incoming line end 101 and is externally connected to a power supply, an output end of the power distribution module 201 is divided into two paths, one of the two paths is electrically connected to the current and voltage metering and sampling module 202, the data processing module 203, the micro processing module 204 and the communication module 205, the other path provides a negative power supply for an operational amplifier, an input end of the current and voltage metering and sampling module 202 is connected to the incoming line end 101 and is connected to an input voltage, an output end of the current and voltage metering and sampling module 202 is electrically connected to an input end of the data processing module 203, an output end of the data processing module 203 is electrically connected to an input end of the micro processing module 204, and an output end of the micro processing module 204 is electrically connected to an input end of the communication module 205, because the analyzer tests high-voltage alternating-current signals, and each module needs to work in a direct-current environment and has different working voltages, the power distribution module 201 distributes an AC220V power supply to working power supplies with different voltages and transmits the working power supplies to each module, the current and voltage metering and sampling module 202 collects electric energy parameters and then enters the data processing module 203, static parameters and dynamic parameters of variable-frequency signals, such as voltage, current, power and 99-order harmonic, are extracted through FFT and wavelet transformation, electric energy quality analysis is carried out, the data processing module 203 sends various collected data and analysis results to the micro-processing module 204 after collecting and calculating data, and the micro-processing module 204 uploads the data through the communication module 205, so that electric energy quality monitoring is realized.

As an embodiment of the present invention, further, the power distribution module 201 includes a flyback switch module 2011 and a power conversion module 2012, an output end of the flyback switch module 2011 is electrically connected to an input end of the power conversion module 2012, the AC220V power supply outputs a 5V dc voltage through the flyback switch module 2011, a rear stage of the 5V dc voltage is divided into two branches, the branches output a 3.3V dc voltage through LM1117-33 chips in the power conversion module 2012, so as to provide a working power supply for the current and voltage metering and sampling module 202, the data processing module 203, the micro processing module 204 and the communication module 205, and the branch outputs a negative 5V dc voltage through K7805-500R2 chips in the power conversion module 2012, so as to provide a negative power supply for the operational amplifier.

As an embodiment of the present invention, further, the flyback switch module 2011 includes a protection module 20111, a high-frequency transformer coupling module 20112, a dc power output module 20113 and a monitoring circuit module 20114, the protection module 20111 is disposed at a front end of the high-frequency transformer coupling module 20112, and is composed of C1, R83, R84 and R85, when an input voltage is a high voltage, a divided voltage of the R85 is increased, and when a pin 5 of the switching power chip HF920GS-Z (U2) detects that the voltage is higher than a certain value, the chip is turned off and no longer outputs, so as to protect a subsequent circuit, the high-frequency transformer coupling module 20112 includes two sets of primary coils and secondary coils, and is used for voltage reduction and isolation, one set of the secondary coils is electrically connected to the dc power output module 20113, the dc power output module 20113 is composed of D2 and a circuit for releasing an instantaneous high voltage when a power outage occurs, and when the power outage occurs, the D2 is in an off state, the C10 in the release circuit is in a state through an LX5, The resistor R96 continuously outputs 5V dc voltage for the rear stage, the monitoring circuit module 20114 includes a switching power supply chip and a feedback circuit, the 6 pins of the switching power supply chip HF920GS-Z (U2) are feedback pins, and the 14 pins are output pins. The feedback circuit selects TL431 as a reference and a feedback amplifier, when the output voltage generates deviation, the optical coupler op1 is conducted, the current of the pin 6 of the HF920GS-Z (U2) of the switching power supply chip changes, and the voltage output of the pin 14 is further influenced.

As an embodiment of the present invention, further, the current-voltage metering and sampling module 202 includes a 2.4M resistor string 2021, a current-type voltage transformer 2022, a sampling resistor 2023, and a gain amplifier 2024, an input voltage signal enters the current-type voltage transformer 2022 after passing through the 2.4M resistor string 2021, an output end of the current-type voltage transformer 2022 passes through the sampling resistor 2023, is amplified by the gain amplifier 2024 by 100 times, and is input to a chip voltage sampling pin of the current-voltage metering and sampling module 202, and an input current signal passes through the current-type voltage transformer 2022, is amplified by the gain amplifier 2024 by 6.2 times, and is input to the chip current sampling pin of the current-voltage metering and sampling module 202.

As an embodiment of the present invention, further, the communication module 205 includes an RS485 communication module 2051, an LORA wireless communication module 2052, and an infrared communication module 2053, the RS485 communication module 2051 is electrically connected to the 485 interface 1021, the LORA wireless communication module 2052 is electrically connected to the antenna interface 104, the infrared communication module 2053 is electrically connected to the infrared communication interface 105, the RS485 communication module 2051 considers high voltage protection and forward driving capability, an upper pull-down resistor (R2\ R23) of the RS485 communication circuit is designed as a 20K Ω resistor, the driving capability is provided, the power consumption is low, the TVS (SMBJ8.5CA) is designed to protect differential mode surge voltage, the voltage is clamped at 6.8V, the circuit is prevented from being damaged by overvoltage, the LORA wireless communication module 2052 adopts a ZM470SX-M module, the transmissible distance is 1000 meters, the infrared communication module 2053 adopts a reasonable resistance design, and the infrared transmission distance can reach 5 meters.

As an embodiment of the present invention, further, the default communication rate of the RS485 communication module 2051 and the LORA wireless communication module 2052 is 2400bit/s, the default communication rate of the infrared communication module 2053 is 1200bit/s, the interface communication follows the DL/T645 once 2007 protocol, and the standard communication rate is configured with 1200bit/s, 2400bit/s, 4800bit/s, 9600bit/s, 19200 bit/s.

As an embodiment of the present invention, further, the measurement interface 1022 is externally connected to a dedicated measurement instrument, and measures and analyzes active power and reactive power parameters of the power quality, so as to provide a wider application function for the analyzer.

As an embodiment of the present invention, further, an input end of the microprocessor module 204 is accessed to a user instruction, an output end of the microprocessor module is accessed to a group of communication modules in the communication module 205 correspondingly to upload monitoring analysis data, the microprocessor module 204 is an ARM processor, a chip model is STM32F103RCT6, the chip is a Cortex-M3 kernel, a built-in floating point arithmetic unit (FPU) is provided, a working voltage range is 2.0V to 3.6V, a required 1.8V power supply is provided through a built-in voltage regulator, a maximum working frequency is 168MHz, a built-in 64 kbyte static SRAM is provided, a built-in 512 kbyte flash memory is provided, a passive 32.768Hz external crystal oscillator is adopted, a working clock is provided for an MCU after frequency multiplication, two 512KB EEPROMs are externally connected to the microprocessor module 204, and 1 EEPROM is used for storing 8-way metering related parameters, including table calibration data and the like; the other 1 EEPROM is used for storing various electric energy data and backup electric energy data.

As an embodiment of the present invention, further, the current and voltage measurement sampling module 202 is an AD sampling module, and has 8 sets of sampling channels, the core chip is ADC7606B, the number of sampling points per second of a conventional measurement chip is 128k, for a high frequency signal of 1000Hz, the measurement chip cannot measure correctly, the ADC7606B chip is a 16-bit synchronous sampling and analog-to-digital conversion data acquisition system, the number of sampling points per second is 800k, which is equivalent to a sampling frequency of 50KHz, and satisfies measurement and acquisition of the high frequency signal, the ADC7606B chip converts the sampling signal into a set of code streams whose duty ratios are related to the signal values, and sends the code streams to the data processing module 203 through a parallel data bus for processing.

As an embodiment of the present invention, further, the data processing module 203 and the current-voltage measurement sampling module 202 are connected by an SPI parallel data line, the SPI parallel data transmission is 16 times higher than the serial data transmission, the transmission rate is increased, the processing speed of the data processing module 203 is increased, the data processing module 203 is DSP-processed, the chip model is STM32F429VET6, the high-performance ARM Cortex-M432 bit RISC core, the main frequency can reach 180MHz, the core of the ARM-M4 has a single-precision floating point arithmetic unit, supports all ARM single-precision data processing instructions and data types, has a Memory Protection Unit (MPU) with a set of DSP instructions and application security, integrates a high-speed embedded memory and a backup SRAM up to 4 kbytes, and a large number of enhanced I/O and peripheral devices, has 3 12 bit ADCs, 2 DACs, 1 low-power consumption RTC, 12 general 16-bit timers, 2 32-bit timers.

Specifically, this wireless twin-core frequency conversion electric energy quality analyzer's theory of operation: a detection line is connected to a line inlet end 101 at the top of the housing 100 and is connected to an AC220V power supply, the line connection and detection analysis operation state is judged by the indicator light 103, the power supply first passes through a flyback switch module 2011, a switch power supply chip HF920GS-Z (U2) in a monitoring circuit module 20114 is in a conducting state, the voltage polarity of a primary coil of the high-frequency transformer coupling module 20112 is positive and negative, the voltage polarity induced by a secondary coil is negative and positive, a diode D2 in the dc power output module 20113 is turned off, voltage is applied to a primary coil of the high-frequency transformer coupling module 20112, the current in the coil is linearly increased, and the influence of output load current on the high-frequency transformer coupling module 20112 is blocked because D2 is turned off, so that in this stage, the energy storage of the high-frequency transformer coupling module 20112 is increased along with the increase of input current, and an output capacitor C10 provides output 5V dc voltage, the monitoring circuit module 20114 is configured such that the switching power supply chip HF920GS-Z (U2) is in an off state, the input current of the high-frequency transformer coupling module 20112 disappears, but the current of the primary coil cannot suddenly change due to the existence of the inductance of the primary coil, and the current keeps the original direction, so that the drain output capacitor of the MOS transistor integrated in the switching power supply chip HF920GS-Z (U2) is rapidly charged, the high-frequency oscillation is generated by the equivalent inductance, a peak voltage is generated at the drain of the MOS transistor, the voltage polarity of the primary coil is suddenly changed to be positive, negative, and negative, the diode D2 in the dc power supply output module 20113 is turned on, the energy stored in the inductance of the primary coil is transferred and released to the load, two branches are arranged at the rear stage of the 5V dc voltage, the 5V dc voltage in the branch one is output by the LM 7-33 chip in the power supply conversion module to be 3.3V dc voltage, working power supplies are provided for an AD7606B chip of the current and voltage metering sampling module 202, an STM32F429VET6 chip of the data processing module 203, an STM32F103RCT6 chip of the microprocessing module 204 and a BL3085A chip of the RS485 communication module 2051; the 5V DC voltage in the branch II outputs a negative 5V DC voltage through a K7805-500R2 chip in a power supply conversion module to provide a negative power supply for an operational amplifier, the current and voltage metering and sampling module 202 conducts voltage and current sampling after being powered on, the voltage sampling process is that the A-way voltage enters the input end of a PT1 in a current-type voltage transformer 2022 after passing through a 2.4M resistor string 2021 (R3-R8), the PT1 inputs 2mA in a rated mode, outputs 2mA in a rated mode, the linear range is 0-1000V, the linearity is less than or equal to 0.2%, the same current is induced at the output end, the current enters a gain amplifier 2024(LM2902U8) after passing through a 100 omega sampling resistor 2023(R17), the signal is amplified by 100 times and then enters an A-way voltage sampling pin of a chip ADC76 7606B of the current and voltage metering and sampling module 202, and similarly, the C-way voltage passes through the 2.4M resistor string 2021 (R10-R15) and enters the input end of a PT2 input end of the current-type voltage transformer in the current-type voltage transformer 2022, PT2 inputs 2mA nominally, outputs 2mA nominally, the linear range is 0-1000V, the linearity is less than or equal to 0.2%, the same current is induced at the output end, the current enters a gain amplifier 2024(LM2902U8) after passing through a 100 Ω sampling resistor 2023(R18), the signal is amplified by 100 times and enters a B-path voltage sampling pin of a chip ADC7606B of the current and voltage metering sampling module 202, the current sampling is compatible with the sampling of a current type voltage transformer 2022 or the current sampling is carried out by a Rogowski coil, if the current type voltage transformer 2022 is adopted, the output is a current signal, the signal enters a gain amplifier 2024(LM2902U7) through a 5.1 Ω sampling resistor 2023, the signal is amplified by 6.2 times and then is input to a current sampling pin of a chip ADC7606B of the voltage metering sampling module 202, if the Rogowski coil is adopted, the output is a voltage signal, the signal enters the gain amplifier 2024(LM2902U 385) to carry out the signal amplification by 6.2 times and then is input to a current sampling pin 7664 of the chip ADC of the voltage metering sampling module 202, after sampling is completed by the chip ADC7606B of the voltage measurement sampling module 202, the data enters the chip STM32F429VET6 of the data processing module 203, static parameters and dynamic parameters of frequency-variable signals, such as voltage, current, power and 99 th harmonic, are extracted through FFT and wavelet transform, analysis of power quality is performed, after data acquisition and calculation are performed by the chip STM32F429VET6 of the data processing module 203, various acquired data and analysis results are sent to the chip STM32F103RCT6 of the micro-processing module 204, after a user instruction is received by the micro-processing module 204, data are uploaded through a communication interface according to user requirements, and monitoring of power quality is achieved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The wireless double-core variable-frequency power quality analyzer is characterized by comprising a shell (100) and a controller (200), wherein the controller (200) is arranged inside the shell (100);

the top of the shell (100) is provided with a wire inlet end (101), the bottom of the shell (100) is provided with an output end (102), the output end (102) comprises a 485 interface (1021) and a measurement interface (1022), and the front side of the shell (100) is provided with an indicator lamp (103), an antenna interface (104) and an infrared communication interface (105);

the controller (200) comprises a power distribution module (201), a current and voltage measurement sampling module (202), a data processing module (203), a micro-processing module (204) and a communication module (205), wherein the input end of the power distribution module (201) is connected with the incoming line end (101) and is externally connected with a power supply, the output end of the power distribution module (201) is divided into two paths, one path of the output end is respectively connected with the current and voltage measurement sampling module (202), the data processing module (203), the micro-processing module (204) and the communication module (205), the other path of the output end is used for providing a negative power supply for the operational amplifier, the input end of the current and voltage measurement sampling module (202) is connected with the incoming line end (101) and is connected with an input voltage, and the output end of the current and voltage measurement sampling module (202) is electrically connected with the input end of the data processing module (203), the output end of the data processing module (203) is electrically connected with the input end of the micro-processing module (204), and the output end of the micro-processing module (204) is electrically connected with the input end of the communication module (205).

2. The wireless dual-core variable frequency power quality analyzer according to claim 1, wherein the power distribution module (201) comprises a flyback switch module (2011) and a power conversion module (2012), and an output end of the flyback switch module (2011) is electrically connected with an input end of the power conversion module (2012).

3. The wireless dual-core variable frequency power quality analyzer according to claim 2, wherein the flyback switch module (2011) comprises a protection module (20111), a high-frequency voltage transformation coupling module (20112), a direct current power output module (20113) and a monitoring circuit module (20114), the protection module (20111) is arranged at the front end of the high-frequency voltage transformation coupling module (20112), the high-frequency voltage transformation coupling module (20112) comprises two sets of primary coils and secondary coils, one set of the secondary coils is electrically connected with the direct current power output module (20113), and the monitoring circuit module (20114) comprises a switch power chip and a feedback circuit.

4. The wireless dual-core variable frequency power quality analyzer according to claim 1, the current and voltage metering sampling module (202) comprises a 2.4M resistor string (2021), a current type voltage transformer (2022), a sampling resistor (2023) and a gain amplifier (2024), an input voltage signal enters the current type voltage transformer (2022) after passing through the 2.4M resistor string (2021), the output end of the current type voltage transformer (2022) passes through the sampling resistor (2023), then is amplified by the gain amplifier (2024) by 100 times and then is input to the chip voltage sampling pin of the current and voltage metering sampling module (202), and the input current signal passes through the current type voltage transformer (2022), then is amplified by the gain amplifier (2024) by 6.2 times and then is input to the chip current sampling pin of the current and voltage metering sampling module (202).

5. The wireless dual-core variable-frequency power quality analyzer according to claim 1, wherein the communication module (205) comprises an RS485 communication module (2051), an LORA wireless communication module (2052) and an infrared communication module (2053), the RS485 communication module (2051) is electrically connected with the 485 interface (1021), the LORA wireless communication module (2052) is electrically connected with the antenna interface (104), and the infrared communication module (2053) is electrically connected with the infrared communication interface (105).

6. The wireless dual-core frequency conversion power quality analyzer as claimed in claim 5, wherein the default communication rate of the RS485 communication module (2051) and the LORA wireless communication module (2052) is 2400bit/s, the default communication rate of the infrared communication module (2053) is 1200bit/s, and the interface communication follows DL/T645-.

7. The wireless dual-core variable frequency power quality analyzer according to claim 1, wherein the measurement interface (1022) is externally connected with a special measuring instrument for measuring the parameters of active power and reactive power of the analyzed power quality.

8. The wireless dual-core variable-frequency power quality analyzer according to claim 1, wherein an input end of the microprocessor module (204) is connected with a user instruction, an output end of the microprocessor module is correspondingly connected with a group of communication modules in the communication module (205) to upload monitoring analysis data, the microprocessor module (204) is an ARM processor, and a chip model is STM32F103RCT 6.

9. The wireless dual-core variable-frequency power quality analyzer according to claim 1, wherein the current-voltage metering sampling module (202) is an AD sampling module, has 8 groups of sampling channels, and has a core chip type number of ADC 7606B.

10. The wireless double-core frequency conversion power quality analyzer according to claim 1, wherein the data processing module (203) is connected with the current and voltage measurement sampling module (202) through an SPI parallel data line, the data processing module (203) is processed by a DSP, and the chip model is STM32F429VET 6.

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