CN114878903A - Detection circuit based on zero-crossing detection discrimination method and electric energy meter wrong wiring detector - Google Patents
Detection circuit based on zero-crossing detection discrimination method and electric energy meter wrong wiring detector Download PDFInfo
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Abstract
The invention discloses a detection circuit based on a zero-crossing detection discrimination method and an electric energy meter wrong wiring detector, wherein the method comprises the following steps: the information interaction end of the main control MCU module is connected with the first information interaction end of the data communication module, the output end of the main control MCU module is connected with the input end of the display alarm module, and the second information interaction end of the data communication module is connected with the information interaction end of the signal acquisition processing module; and the main control MCU module is used for establishing communication with the signal acquisition and processing module through the data communication module, analyzing and judging the received data uploaded by the data communication module based on a zero-crossing detection discrimination method, and judging whether to send a driving signal to the display alarm module according to a judgment result. The electric energy meter wrong wiring detector designed by the method can facilitate direct detection of the wiring mode and the electric energy metering of the intelligent electric energy meter after an installer installs the intelligent electric energy meter, and avoids the problem of low detection efficiency caused by manual measurement.
Description
Technical Field
The invention relates to the field of wrong wiring detection of a wrong wiring detector of an electric energy meter, in particular to a detection circuit based on a zero-crossing detection discrimination method and the wrong wiring detector of the electric energy meter.
Background
As an intelligent electric energy meter closely related to daily life of a user, not only the wiring correctness of the intelligent electric energy meter but also the metering accuracy of the intelligent electric energy meter are required, but the replacement detection process of the existing intelligent electric energy meter is extremely complicated and complex. After the intelligent electric energy meter is installed, an installer needs to measure a large amount of field data in order to detect whether the wiring and the metering of the intelligent electric energy meter are correct or not, a phasor diagram is drawn according to the measured data, the wiring state and the self metering are judged by using methods such as a hexagonal diagram method, a table look-up method, a moment method and a phase voltammetry method, the process is time-consuming, the problem of low detection efficiency of manual measurement exists, the problem of little metering or no metering of the intelligent electric energy meter in the using process is often caused, and great economic loss is caused to an electric power enterprise.
Disclosure of Invention
The invention mainly aims to provide a detection circuit based on a zero-crossing detection discrimination method and an electric energy meter misconnection detector, and aims to solve the technical problem that the electric energy meter misconnection detector has little or no metering in the use process due to low detection efficiency caused by excessively complicated and complicated manual detection process of the conventional electric energy meter misconnection detector, so that great economic loss is caused to an electric power enterprise.
In order to achieve the above object, the present invention provides a detection circuit based on a zero-crossing detection discrimination method, which comprises a main control MCU module, a data communication module, a signal acquisition processing module and a display alarm module;
the information interaction end of the main control MCU module is connected with the first information interaction end of the data communication module, the output end of the main control MCU module is connected with the input end of the display alarm module, and the second information interaction end of the data communication module is connected with the information interaction end of the signal acquisition processing module;
the main control MCU module is used for establishing communication with the signal acquisition and processing module through the data communication module, analyzing and judging received signal data uploaded by the data communication module based on a zero-crossing detection discrimination method, and judging whether to send a driving signal to the display alarm module according to a judgment result;
the data communication module is used for linking up the communication between the main control MCU module and the signal acquisition processing module;
the signal acquisition processing module is used for acquiring voltage signals and current signals and converting the voltage signals and the current signals into digital signals for storage;
and the display alarm module is used for sending a prompt signal and an alarm sound signal when receiving the driving signal of the main control MCU module.
Optionally, the main control MCU module comprises a detection and judgment module;
the detection and judgment module is used for detecting the phase sequence of the voltage wiring after receiving the signal data uploaded by the data communication module, acquiring the voltage signal and the current signal based on the signal data on the premise that the voltage wiring is the positive phase sequence, judging whether the phases of the voltage signal and the current signal are synchronous, judging that the wiring mode is correct if synchronous, and judging that the wiring mode is wrong if asynchronous.
Optionally, the signal acquisition and processing module comprises a three-phase voltage signal acquisition and conditioning circuit, a three-phase current signal acquisition and conditioning circuit and a three-phase signal conversion and processing MCU;
and the output ends of the three-phase voltage signal acquisition and conditioning circuit and the three-phase current signal acquisition and conditioning circuit are respectively connected with the input end of the three-phase signal conversion and processing MCU.
Optionally, the three-phase voltage signal acquisition and conditioning circuit includes a voltage transformer, a first resistor, a second resistor, a first capacitor, and a second capacitor;
a primary coil of the voltage transformer receives a voltage signal;
a secondary coil at one end of the voltage transformer is connected with the first resistor, and a secondary coil at the other end of the voltage transformer is connected with the second resistor;
the first capacitor and the second capacitor are connected in series at one end of the first resistor and the second resistor far away from the voltage transformer.
Optionally, the three-phase signal conversion and processing MCU further comprises an a/D converter.
Optionally, the three-phase current signal acquisition and conditioning circuit includes a protection secondary pair transistor, a filter network, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and an anti-aliasing filter;
the input end of the protection secondary geminate transistor receives a current signal, and the output end of the protection secondary geminate transistor is connected with the input end of the filter network;
the third resistor and the fourth resistor are connected with the output end of the filter network in parallel;
the anti-aliasing filter comprises a fourth resistor, a fifth resistor, a sixth resistor, a fifth resistor and a sixth resistor, wherein the fifth resistor and the sixth resistor are connected in parallel, one end of the fifth resistor is connected with one end of the fourth resistor, the other end of the fifth resistor is connected with the output end of the anti-aliasing filter, one end of the sixth resistor is connected with the other end of the fourth resistor, and the other end of the sixth resistor is connected with the output end of the anti-aliasing filter.
Optionally, the data communication module includes a first high-speed near-infrared transceiver tube, a second high-speed near-infrared transceiver tube, a third high-speed near-infrared transceiver tube, and a fourth high-speed near-infrared transceiver tube;
the first receiving triode of the first high-speed near-infrared receiving and transmitting tube is connected with an RX receiving pin of the main control MCU module, the second receiving triode of the second high-speed near-infrared receiving and transmitting tube is connected with an RXA receiving pin of the signal acquisition and processing module, the third receiving triode of the third high-speed near-infrared receiving and transmitting tube is connected with an RXB receiving pin of the signal acquisition and processing module, and the fourth receiving triode of the fourth high-speed near-infrared receiving and transmitting tube is connected with an RXC receiving pin of the signal acquisition and processing module.
Optionally, the data communication module further includes a first triode, a second triode, a third triode, and a fourth triode;
the base electrode of the first triode is connected with the TX transmitting pin of the main control MCU module, the emitting electrode of the first triode is connected with the first emitting diode of the first high-speed near-infrared receiving and transmitting tube, and the collecting electrode of the first triode is grounded;
the base electrode of the second triode is connected with the TXA sending pin of the signal acquisition processing module, the emitting electrode of the second triode is connected with the second emitting diode of the second high-speed near-infrared receiving and transmitting tube, and the collector electrode of the second triode is grounded;
the base electrode of the third triode is connected with the TXB sending pin of the signal acquisition processing module, the emitting electrode of the third triode is connected with the second emitting diode of the third high-speed near-infrared receiving and transmitting tube, and the collector electrode of the third triode is grounded;
the base electrode of the fourth triode is connected with the TXC sending pin of the signal acquisition and processing module, the emitting electrode of the fourth triode is connected with the third emitting diode of the fourth high-speed near-infrared receiving and transmitting tube, and the collecting electrode of the fourth triode is grounded.
Optionally, the display alarm circuit comprises an indicator lamp set and a buzzer alarm circuit;
the indicating lamp group is used for switching the indicating lamps when the driving signal is received;
and the buzzing alarm circuit is used for controlling the buzzer to enter a working state when receiving the driving signal.
The embodiment also provides an electric energy meter misconnection detector, which comprises the detection circuit based on the zero-crossing detection discrimination method, wherein the detection circuit based on the zero-crossing detection discrimination method comprises a main control MCU module, a data communication module, a signal acquisition processing module and a display alarm module;
the information interaction end of the main control MCU module is connected with the first information interaction end of the data communication module, the output end of the main control MCU module is connected with the input end of the display alarm module, and the second information interaction end of the data communication module is connected with the information interaction end of the signal acquisition processing module;
the main control MCU module is used for establishing communication with the signal acquisition and processing module through the data communication module, analyzing and judging received signal data uploaded by the data communication module based on a zero-crossing detection discrimination method, and judging whether to send a driving signal to the display alarm module according to a judgment result;
the data communication module is used for linking up the communication between the main control MCU module and the signal acquisition processing module;
the signal acquisition processing module is used for acquiring voltage signals and current signals and converting the voltage signals and the current signals into digital signals for storage;
and the display alarm module is used for sending a prompt signal and an alarm sound signal when receiving the driving signal of the main control MCU module.
The technical scheme of the invention forms an embedded software module by a detection method based on a zero-crossing detection discrimination method and arranges the embedded software module in a detection judgment module of a main control MCU module, so that the main control MCU module can automatically detect the wiring mode and the electric energy measurement of the electric energy meter wrong wiring detector, the electric energy meter wrong wiring detector can automatically detect the replacement of the electric energy meter wrong wiring detector based on the main control MCU module, a data communication module, a signal acquisition processing module and a display alarm module, the zero point time and the digital signal of the voltage and the current of the electric energy meter wrong wiring detector are timed, acquired, adjusted and analyzed and judged based on the signal acquisition processing module, the connection between the main control MCU module and the signal acquisition processing module is established based on the data communication module, and the effective data acquired by the signal acquisition processing module can be transmitted to the main control MCU module for detection, the electric energy meter wrong wiring detector designed by the method can facilitate direct detection of the wiring mode and the electric energy metering of the intelligent electric energy meter after an installer installs the intelligent electric energy meter, and avoids the problem of low detection efficiency caused by manual measurement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a detection circuit based on zero-crossing detection discrimination according to the present invention;
FIG. 2 is a schematic diagram of two successive signal cycles of a three-phase time axis signal waveform of the present invention;
FIG. 3 is a schematic diagram of a circuit structure in the three-phase voltage signal acquisition and conditioning circuit of the present invention;
FIG. 4 is a schematic diagram of a circuit structure of a three-phase current signal acquisition and conditioning circuit according to the present invention;
FIG. 5 is a schematic structural diagram of 4 pairs of high-speed near-infrared transceiver tubes in the data communication module according to the present invention;
FIG. 6 is a schematic structural view of a high-speed near-infrared transceiver of the module A of the present invention;
FIG. 7 is a schematic structural view of a high-speed near-infrared transceiver of the B module of the present invention;
FIG. 8 is a schematic diagram of the operation flow of the master control MCU module according to the present invention;
fig. 9 is a schematic operation flow diagram of the three-phase signal conversion and processing MCU of the present invention.
The reference numbers illustrate:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a detection circuit based on a zero-crossing detection discrimination method.
In an embodiment of the present invention, as shown in fig. 1, the detection circuit based on the zero-crossing detection discrimination method includes a main control MCU module 10, a data communication module 20, a signal acquisition processing module 30, and a display alarm module 40;
the information interaction end of the main control MCU module 10 is connected with the first information interaction end of the data communication module 20, the output end of the main control MCU module 10 is connected with the input end of the display alarm module 40, and the second information interaction end of the data communication module 20 is connected with the information interaction end of the signal acquisition processing module 30;
the main control MCU module 10 is configured to establish communication with the signal acquisition and processing module 30 through the data communication module 20, analyze and judge received signal data uploaded by the data communication module 20 based on a zero-crossing detection and discrimination method, and determine whether to send a driving signal to the display alarm module 40 according to a judgment result;
the data communication module 20 is configured to link communication between the master control MCU module 10 and the signal acquisition and processing module 30;
the signal acquisition processing module 30 is configured to acquire a voltage signal and a current signal, and convert the voltage signal and the current signal into digital signals for storage;
and the display alarm module 40 is used for sending out a prompt signal and an alarm sound signal when receiving the driving signal of the main control MCU module 10.
Further, referring to fig. 2, the main control MCU module 10 includes a detection and judgment module;
the detection and judgment module is configured to detect a phase sequence of a voltage wiring after receiving the signal data uploaded by the data communication module 20, and on the premise that the voltage wiring is detected to be a positive phase sequence, judge whether phases of the voltage signal and the current signal are synchronous or not based on the signal data, determine that a wiring manner is correct if the phases are synchronous, and determine that the wiring manner is incorrect if the phases are not synchronous.
Taking the three-phase four-wire access method as an example, under the conditions of balanced three-phase voltage, balanced load and 1 power factor, the first step of the checking and judging module in the main control MCU module 10 is to judge the phase sequence of the voltage connection of the intelligent electric energy meter, and detect whether the voltage connection of the intelligent electric energy meter has the wrong connection method with the reverse phase sequence, in the actual detection, the three-phase is generally represented by A, B, C, which is the same in this embodiment, in the specific connection method, the total connection combination of voltage lines is 6, wherein the combination of the positive phase sequence has the combination of positive phase sequence
The combination of the reverse phase sequence has
The analysis on the wiring combination of the positive phase sequence and the negative phase sequence shows that only the signals collected by the channel B are ensured to lag behind the signals collected by the channel A and lead the signals collected by the channel C, the connection is in positive phase sequence, otherwise in negative phase sequence, with reference to two consecutive signal periods of the time axis signal waveform plotted in fig. 2, in the figure, the waveform of a circular point is the voltage signal acquired by the channel A, the waveform of a dashed line is the voltage signal acquired by the channel B, the waveform of a solid line is the voltage signal acquired by the channel C, the time scales of two zero points (the zero points mentioned in the text are the intersection points of the signals and the time coordinate axis in the descending process) of the voltage signal acquired by the channel A are Ta1 and Ta2 respectively, the time scales of two zero points of the voltage signal acquired by the channel B are Tb1 and Tb2, and the time scales of two zero points of the voltage signal acquired by the channel C are Tc1 and Tc2 respectively. In order to determine the phase relation of the voltage signals of the three-phase sampling channels, the phase relation of the three-phase voltages is represented by time intervals among zero points of the three-phase voltages, namely, a certain moment is randomly selected as a synchronous time scale Tr of the three-phase channels, the three-phase channels start timing at the same time, once the zero points of the voltage signals are detected by each phase channel, timing is stopped immediately, and the timing time of the three-phase channels is respectively marked as delta Tua, delta Tub and delta Tuc. As can be seen from fig. 2, there are 3 possible positions of the randomly selected synchronization time scale Tr relative to the time scale of the first zero point of the signals acquired by the three channels, and therefore the three channels are divided into 3 sets of relations based on the 3 possible positions, that is:
(1) when Tr is T1, when the relation of delta Tua and delta Tub and delta Tuc is satisfied, the three-phase channel acquisition signal is positive phase sequence.
(2) When Tr is T2, when the relation of delta Tub and delta Tuc is satisfied, the three-phase channel acquisition signal is positive phase sequence.
(3) When Tr is T3, when the relation of delta Tuc < Tua < delta Tub is satisfied, the three-phase channel acquisition signal is positive phase sequence.
Therefore, according to the above relation, only when the relation of the voltage phase is Δ Tua < Δtub < Δtuc or Δ Tub < Δtuc < Δtua or Δ Tuc < Δtub, the voltage connection of the intelligent electric energy meter is positive phase sequence, otherwise, the voltage connection is negative phase sequence, and the voltage connection of all the intelligent electric energy meters is determined to be wrong connection mode when the voltage connection is negative phase sequence.
After detecting that the voltage connection of the intelligent electric energy meter is a positive phase sequence, the checking and judging module in the main control MCU module 10 starts a second step, namely, according to the phase relation of the acquired voltage signal and current signal, analyzing the influence of the connection combination on the electric energy metering of the intelligent electric energy meter, still obtaining the time interval of the voltage signal and the current signal of each channel on a time coordinate axis, after a synchronous time scale Tr, simultaneously starting the detection of a voltage zero point and a current zero point by a three-phase channel, stopping timing after acquiring the zero points of the voltage signal and the current signal, respectively obtaining the timing time delta Tua, delta Tub and delta Tuc of the voltage signal zero point detected by the three-phase channel, the timing time Tia, delta Tib and delta Tic of the current signal zero point, and further obtaining the time interval of the voltage signal and the current signal of the three-phase channel on the time coordinate axis, in other words, the phase relationship between the voltage signal and the current signal of each phase channel can be obtained according to the magnitude of the values of Δ Ta, Δ Tb, and Δ Tc, and the voltage signal and the current signal cannot be completely synchronized due to the phase delay existing when the power factor is 1 in the actual application environment, so that the phase synchronization of the voltage signal and the current signal is considered as long as the time interval of the voltage signal and the current signal on the time coordinate axis is smaller than a small time constant λ, that is, the connection mode of the intelligent power meter is determined to be a correct connection mode.
Compared with the conventional methods such as a hexagonal graph method, a table look-up method, a moment method, a phase voltammetry method and the like, the zero-crossing detection discrimination method provided by the invention has the advantages of more convenient detection, high execution efficiency and capability of improving the efficiency of wrong wiring detection.
Further, referring to fig. 1, the signal acquiring and processing module 30 includes a three-phase voltage signal acquiring and conditioning circuit 50, a three-phase current signal acquiring and conditioning circuit 60, and a three-phase signal converting and processing MCU 70;
the output ends of the three-phase voltage signal acquisition and conditioning circuit 50 and the three-phase current signal acquisition and conditioning circuit 60 are respectively connected with the input end of the three-phase signal conversion and processing MCU 70.
The three-phase voltage signal acquisition and conditioning circuit 50 is used for acquiring voltage parameters, namely delta Tua, delta Tub and delta Tuc, in three-phase power of a connected electric energy meter, and the conditioning circuit filters small voltage signals transmitted by a sensor through a low-pass filter network and inputs the conditioned voltage signals into the three-phase signal conversion and processing MCU70 in a differential mode.
The three-phase current signal acquisition and conditioning circuit 60 is used for acquiring current parameters, namely delta Tia, delta Tib and delta Tic, in three-phase electricity of the connected electric energy meter, and the conditioning circuit is used for converting current signals received by the sensor into voltage signals through filtering network filtering and load resistance of a circuit transformer and then inputting the current signals filtered by the anti-aliasing filter into the three-phase signal conversion and processing MCU 70.
The three-phase signal conversion and processing MCU70 converts the input voltage analog signal and current signal into digital signals, dynamically buffers the information of all digital sampling points in each signal period, receives and responds to the communication control command of the main control MCU module 10 in real time, and transmits the valid data information to the main control MCU module 10 through the data communication module 20. In this embodiment, the three-phase signal conversion and processing MCU70 is preferably a single chip microcomputer of model MSP430AFE253, and because the single chip microcomputer is integrated with three independent 24-bit sigma-delta a/D converters, the sampling frequency of the converters is 4K/s, for a voltage and current signal with a power frequency of 50Hz, the MSP430FE425 can acquire 82 discrete signal points in each signal period, and all sampling point data are buffered for data analysis. Other single-chip microcomputers with the same function can be used, and the invention is not limited.
Further, referring to fig. 3, the three-phase voltage signal collecting and conditioning circuit 50 includes a voltage transformer, a first resistor, a second resistor, a first capacitor and a second capacitor;
in this embodiment, as an example, the input signal of the phase a channel is 220V, as can be seen from fig. 3, the transformation ratio of the selected voltage transformer is 200:1, the primary coil UA of the voltage transformer is connected to the phase a voltage line of the intelligent electric energy meter, the primary coil UA-of the voltage transformer is connected to the zero line of the intelligent electric energy meter, so that the received voltage signal is changed into a small voltage signal through the voltage transformer, the transportation of the voltage signal in the acquisition and conditioning circuit 50 of the three-phase voltage signal is convenient, a secondary coil at one end of the voltage transformer is connected with the first resistor, a secondary coil at the other end of the voltage transformer is connected with the second resistor, the first capacitor and the second capacitor are connected in series at one end of the first resistor and the second resistor far away from the voltage transformer, the first resistor, the second resistor, the first capacitor and the second capacitor form a low-pass filter network to filter the voltage small signal in a differential mode.
Specifically, the three-phase signal conversion and processing MCU70 further includes an a/D converter.
The A/D converter is used for converting the received voltage analog signal and the current signal into a digital signal, and because the digital signal has higher anti-interference capability, longer transmission distance and small distortion amplitude in the transmission process compared with the analog signal, the integrity of the voltage signal and the current signal can be ensured to the greatest extent in the process of being transmitted to the main control MCU module 10 through the data communication module 20.
Further, referring to fig. 4, the three-phase current signal collecting and conditioning circuit 60 includes a protection secondary pair transistor, a filter network, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and an anti-aliasing filter;
in this embodiment, as an example that an input signal of an a-phase channel is 1.5A, a current transformer of 1.5A-5mA is adopted as a three-phase current signal acquisition and conditioning circuit 60, as can be seen from fig. 4, a current line of the electric energy meter misconnection detector in this embodiment is connected in series with a current line of the intelligent electric energy meter, an end 1 is connected with a current return line of the a-phase channel of the intelligent electric energy meter, an end 2 is connected with a load loop of the intelligent electric energy meter, an input end of the protection secondary pair tube receives a current signal to avoid damage of surge current to the electric energy meter misconnection detector, an output end of the protection secondary pair tube is connected with an input end of the filter network, and the filter network is composed of a magnetic bead L101 and a magnetic bead L102, respectively, a capacitor C101 and a capacitor C102, and is used for filtering high-frequency interference signals; the third resistor and the fourth resistor are connected in parallel with the output end of the filter network and used as a load resistor of the current transformer for converting the received current signal into a voltage signal; the fifth resistor and a sixth resistor are connected in parallel, one end of the fifth resistor is connected with one end of the fourth resistor, the other end of the fifth resistor is connected with the output end of the anti-aliasing filter, one end of the sixth resistor is connected with the other end of the fourth resistor, the other end of the sixth resistor is connected with the output end of the anti-aliasing filter, the fifth resistor and the sixth resistor are used as balance resistors of a current transformer, so that the positive and negative of current sampling are balanced relative to a reference voltage synchronous point, the anti-aliasing filter is composed of a resistor R101, a resistor R102, a capacitor C103 and a capacitor C104, and the cutoff frequency of the anti-aliasing filter is f 1/2 pi R101C 103.
Further, as shown in fig. 5, 6 and 7, the data communication module 20 includes a first high-speed near-infrared transceiver PD1, a second high-speed near-infrared transceiver PD2, a third high-speed near-infrared transceiver PD3 and a fourth high-speed near-infrared transceiver PD 4;
a first receiving triode of the first high-speed near-infrared transceiver PD1 is connected to an RX receiving pin of the main control MCU module 10, a second receiving triode of the second high-speed near-infrared transceiver PD2 is connected to an RXA receiving pin of the signal acquisition and processing module 30, a third receiving triode of the third high-speed near-infrared transceiver PD3 is connected to an RXB receiving pin of the signal acquisition and processing module 30, and a fourth receiving triode of the fourth high-speed near-infrared transceiver PD4 is connected to an RXC receiving pin of the signal acquisition and processing module 30.
Specifically, the data communication module 20 further includes a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4;
the base electrode of the first triode Q1 is connected with the TX transmitting pin of the main control MCU module 10, the emitting electrode of the first triode Q1 is connected with the first emitting diode of the first high-speed near-infrared transceiving tube PD1, and the collecting electrode of the first triode Q1 is grounded; the base electrode of the second triode Q2 is connected to the signal acquisition and processing module 30, that is, the TXA transmitting pin of the three-phase signal conversion and processing MCU70, the emitter electrode of the second triode Q2 is connected to the second emitting diode of the second high-speed near-infrared transceiver PD2, and the collector electrode of the second triode Q2 is grounded; the base electrode of the third triode Q3 is connected to the signal acquisition and processing module 30, that is, the TXB transmitting pin of the three-phase signal conversion and processing MCU70, the emitter electrode of the third triode Q3 is connected to the second emitting diode of the third high-speed near-infrared transceiver PD3, and the collector electrode of the third triode Q3 is grounded; the base of the fourth triode Q4 is connected to the signal acquisition and processing module 30, that is, the TXC transmitting pin of the three-phase signal conversion and processing MCU70, the emitter of the fourth triode Q4 is connected to the third emitting diode of the fourth high-speed near-infrared transceiver PD4, and the collector of the fourth triode Q4 is grounded.
As shown in fig. 5, the data communication module 20 has 4 pairs of high-speed near infrared transceivers to realize A, B, C multiplexing of three-phase channel signals with the same physical channel and complete a pair of three-phase UART (Universal Asynchronous Receiver/Transmitter ) communication, as shown in fig. 5, the data communication module 20 comprises A, B two modules, wherein the a module has a transmitting diode and three receiving triodes, the B module has an upper transmitting diode and a receiving triode, when the transmitting diode in the a module initiates communication, the three receiving triodes in the a module can simultaneously receive signal response data communication, and when any one of the three transmitting diodes in the B module initiates communication, the receiving triode in the B module can receive data response communication, which ensures that A, B, C three-phase channel communication shares the same physical channel, and the communication without mutual interference is carried out by adopting a time division multiplexing mode.
In the circuits of fig. 6 and 7, the resistors R1-R11 are current-limiting resistors, and the specific resistance values depend on the communication rate, the working voltage, and the working current of the infrared tube; the capacitors C1-C8 mainly play a role in filtering and instantly stabilizing voltage during communication; the first triode Q1, the second triode Q2, the third triode Q3 and the fourth triode Q4 can prevent large current appearing in the circuit from damaging the MCU port in the communication process.
Further, as shown with reference to fig. 1, the display alarm circuit includes an indicator lamp set and a buzzer alarm circuit;
the indicating lamp group is used for switching the indicating lamps when receiving the driving signal;
and the buzzing alarm circuit is used for controlling the buzzer to enter a working state when receiving the driving signal.
Examples
Referring to the flowchart shown in fig. 8, after the initialization of the intelligent electric energy meter at power-on is finished in the main control MCU module, the main control MCU module sends handshake commands to the a, B, C three-phase data conversion and processing MCUs (i.e., the three-phase signal conversion and processing MCUs) in the signal acquisition and processing module through the data communication module at regular intervals, for example, 10S, and detects whether handshake responses returned by the a, B, C three-phase data conversion and processing MCUs (i.e., the three-phase signal conversion and processing MCUs) are received, and if handshake responses returned by the a, B, C three-phase data conversion and processing MCUs (i.e., the three-phase signal conversion and processing MCUs) are received, sends synchronous time scale broadcast commands to the a, B, C three-phase data conversion and processing MCUs (i.e., the three-phase signal conversion and processing MCUs), and sends read data commands to the a, B, C three-phase data conversion and processing MCUs (i.e., the three-phase signal conversion and processing MCUs) in sequence after a delay time of 1S is received, the method comprises the steps of detecting whether data acquisition and processing of an A, B and C three-phase data conversion and processing MCU (namely a three-phase signal conversion and processing MCU) are finished or not, receiving data information returned by the A, B and C three-phase data conversion and processing MCU (namely the three-phase signal conversion and processing MCU) if the data acquisition and processing of the A, B and C three-phase data conversion and processing MCU are finished, calculating time intervals between voltage zero points and current zero points of each phase channel based on the data information, judging whether wrong wiring exists in the wiring state of the intelligent electric energy meter at the moment or not, and outputting a driving signal to a display alarm module to alarm and display if the wrong wiring exists.
It should be noted that, after each detection, the main control MCU re-initiates the synchronous time scale broadcast command every fixed time, and repeats the detection process to ensure the dynamic real-time performance of the detection.
Referring to the flowchart shown in fig. 9, in the MCU for three-phase signal conversion and processing, after the initialization of the intelligent electric energy meter at power-on is completed, a handshake response is returned after a handshake command sent by the main control MCU module is received, and a timer for detecting zero points of the voltage signal and the current signal is started, at this time, if a synchronous clock broadcast command sent by the main control MCU module is received, the acquisition and conditioning circuit for the three-phase voltage signal and the acquisition and conditioning circuit for the three-phase current signal are respectively started to time, and the two timers for detecting the zero points of the voltage signal and the zero point of the current signal are simultaneously analyzed and determined, on the premise that there is no interference of a large-amplitude harmonic signal, the method considers that the number of the discrete signal points currently acquired is less than or equal to 0, and the number of the discrete signal points sampled last one is greater than 0, such a sampling point is a zero point. And once the first zero points of the voltage signal and the current signal are monitored, stopping timing and storing the timing time of the voltage signal and the current signal respectively, detecting whether the zero point detection marks of the voltage signal and the current signal are set or not, if the zero points of the voltage signal and the current signal are set, cleaning the zero point detection marks of the voltage signal and the current signal, and uploading the stored timing time to the main control MCU module after receiving a data reading command uploaded by the data communication module.
In a real application environment, when the power factor is 1, the voltage signal and the current signal cannot be completely synchronized due to phase delay caused by respective sensors and sampling circuits thereof, and a certain phase difference exists, so that when the phase synchronization relationship between the voltage signal and the current signal is judged, when the time interval of the voltage signal and the current signal on a time coordinate axis is smaller than a small time constant lambda, the phase synchronization between the voltage signal and the current signal is considered.
The embodiment also provides an electric energy meter misconnection detector, which comprises the detection circuit based on the zero-crossing detection discrimination method, wherein the detection circuit based on the zero-crossing detection discrimination method comprises a main control MCU module 10, a data communication module 20, a signal acquisition processing module 30 and a display alarm module 40;
the information interaction end of the main control MCU module 10 is connected with the first information interaction end of the data communication module 20, the output end of the main control MCU module 10 is connected with the input end of the display alarm module 40, and the second information interaction end of the data communication module 20 is connected with the information interaction end of the signal acquisition processing module 30;
the main control MCU module 10 is configured to establish communication with the signal acquisition and processing module 30 through the data communication module 20, analyze and judge the received data uploaded by the data communication module 20 based on a zero-crossing detection and discrimination method, and determine whether to send a driving signal to the display alarm module 40 according to a judgment result;
the data communication module 20 is configured to link communication between the master control MCU module 10 and the signal acquisition and processing module 30;
the signal acquisition processing module 30 is configured to acquire a voltage signal and a current signal, and convert the voltage signal and the current signal into digital signals for storage;
and the display alarm module 40 is used for sending out a prompt signal and an alarm sound signal when receiving the driving signal of the main control MCU module 10.
The specific structure of the electric energy meter misconnection detector refers to the above-mentioned embodiment, and since the electric energy meter misconnection detector adopts all technical solutions of the above-mentioned embodiment of the detection circuit based on the zero-crossing detection discrimination method, at least all beneficial effects brought by the technical solutions of the above-mentioned embodiment are achieved, and are not repeated here.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A detection circuit based on a zero-crossing detection discrimination method is characterized by comprising a main control MCU module, a data communication module, a signal acquisition processing module and a display alarm module;
the information interaction end of the main control MCU module is connected with the first information interaction end of the data communication module, the output end of the main control MCU module is connected with the input end of the display alarm module, and the second information interaction end of the data communication module is connected with the information interaction end of the signal acquisition processing module;
the main control MCU module is used for establishing communication with the signal acquisition and processing module through the data communication module, analyzing and judging received signal data uploaded by the data communication module based on a zero-crossing detection discrimination method, and judging whether to send a driving signal to the display alarm module according to a judgment result;
the data communication module is used for linking up the communication between the main control MCU module and the signal acquisition processing module;
the signal acquisition processing module is used for acquiring voltage signals and current signals and converting the voltage signals and the current signals into digital signals for storage;
and the display alarm module is used for sending a prompt signal and an alarm sound signal when receiving the driving signal of the main control MCU module.
2. The zero-crossing detection discrimination based detection circuit as claimed in claim 1, wherein the main control MCU module comprises a detection judgment module;
the detection and judgment module is used for detecting the phase sequence of the voltage wiring after receiving the signal data uploaded by the data communication module, acquiring the voltage signal and the current signal based on the signal data on the premise that the voltage wiring is the positive phase sequence, judging whether the phases of the voltage signal and the current signal are synchronous, judging that the wiring mode is correct if synchronous, and judging that the wiring mode is wrong if asynchronous.
3. The detection circuit based on the zero-crossing detection discrimination method as claimed in claim 1, wherein the signal acquisition processing module comprises a three-phase voltage signal acquisition and conditioning circuit, a three-phase current signal acquisition and conditioning circuit and a three-phase signal conversion and processing MCU;
and the output ends of the three-phase voltage signal acquisition and conditioning circuit and the three-phase current signal acquisition and conditioning circuit are respectively connected with the input end of the three-phase signal conversion and processing MCU.
4. The zero-crossing detection discrimination based detection circuit as claimed in claim 3, wherein the three-phase voltage signal acquisition and conditioning circuit comprises a voltage transformer, a first resistor, a second resistor, a first capacitor and a second capacitor;
a primary coil of the voltage transformer receives a voltage signal;
a secondary coil at one end of the voltage transformer is connected with the first resistor, and a secondary coil at the other end of the voltage transformer is connected with the second resistor;
the first capacitor and the second capacitor are connected in series at one end of the first resistor and the second resistor far away from the voltage transformer.
5. A detection circuit based on zero crossing detection discrimination as claimed in claim 3 wherein said three phase signal conversion and processing MCU further comprises an a/D converter.
6. The detection circuit based on the zero-crossing detection discrimination method as claimed in claim 3, wherein the acquisition and conditioning circuit of the three-phase current signal comprises a protection secondary pair tube, a filter network, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an anti-aliasing filter;
the input end of the protection secondary geminate transistor receives a current signal, and the output end of the protection secondary geminate transistor is connected with the input end of the filter network;
the third resistor and the fourth resistor are connected with the output end of the filter network in parallel;
the anti-aliasing filter comprises a fourth resistor, a fifth resistor, a sixth resistor, a fifth resistor and a sixth resistor, wherein the fifth resistor and the sixth resistor are connected in parallel, one end of the fifth resistor is connected with one end of the fourth resistor, the other end of the fifth resistor is connected with the output end of the anti-aliasing filter, one end of the sixth resistor is connected with the other end of the fourth resistor, and the other end of the sixth resistor is connected with the output end of the anti-aliasing filter.
7. The zero-crossing detection discrimination-based detection circuit as claimed in claim 1, wherein the data communication module comprises a first high-speed near-infrared transceiver tube, a second high-speed near-infrared transceiver tube, a third high-speed near-infrared transceiver tube and a fourth high-speed near-infrared transceiver tube;
the first receiving triode of the first high-speed near-infrared receiving and transmitting tube is connected with an RX receiving pin of the main control MCU module, the second receiving triode of the second high-speed near-infrared receiving and transmitting tube is connected with an RXA receiving pin of the signal acquisition and processing module, the third receiving triode of the third high-speed near-infrared receiving and transmitting tube is connected with an RXB receiving pin of the signal acquisition and processing module, and the fourth receiving triode of the fourth high-speed near-infrared receiving and transmitting tube is connected with an RXC receiving pin of the signal acquisition and processing module.
8. The zero-crossing detection discrimination based detection circuit as claimed in claim 7, wherein the data communication module further comprises a first transistor, a second transistor, a third transistor and a fourth transistor;
the base electrode of the first triode is connected with the TX transmitting pin of the main control MCU module, the emitting electrode of the first triode is connected with the first emitting diode of the first high-speed near-infrared receiving and transmitting tube, and the collecting electrode of the first triode is grounded;
the base electrode of the second triode is connected with the TXA sending pin of the signal acquisition processing module, the emitting electrode of the second triode is connected with the second emitting diode of the second high-speed near-infrared transceiving tube, and the collector electrode of the second triode is grounded;
the base electrode of the third triode is connected with the TXB sending pin of the signal acquisition processing module, the emitting electrode of the third triode is connected with the second emitting diode of the third high-speed near-infrared receiving and transmitting tube, and the collector electrode of the third triode is grounded;
the base electrode of the fourth triode is connected with the TXC sending pin of the signal acquisition and processing module, the emitting electrode of the fourth triode is connected with the third emitting diode of the fourth high-speed near-infrared receiving and transmitting tube, and the collecting electrode of the fourth triode is grounded.
9. The zero-crossing detection discrimination based detection circuit as claimed in claim 1, wherein the display alarm circuit includes an indicator lamp group and a buzzer alarm circuit;
the indicating lamp group is used for switching the indicating lamps when the driving signal is received;
and the buzzing alarm circuit is used for controlling the buzzer to enter a working state when receiving the driving signal.
10. An electric energy meter miswiring detector, characterized in that the electric energy meter miswiring detector comprises a detection circuit based on zero-crossing detection discrimination according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210733672.8A CN114878903A (en) | 2022-06-24 | 2022-06-24 | Detection circuit based on zero-crossing detection discrimination method and electric energy meter wrong wiring detector |
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| CN202210733672.8A CN114878903A (en) | 2022-06-24 | 2022-06-24 | Detection circuit based on zero-crossing detection discrimination method and electric energy meter wrong wiring detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115442524A (en) * | 2022-08-23 | 2022-12-06 | 西安微电子技术研究所 | Camera shooting method, system and device and computer readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115442524A (en) * | 2022-08-23 | 2022-12-06 | 西安微电子技术研究所 | Camera shooting method, system and device and computer readable storage medium |
| CN115442524B (en) * | 2022-08-23 | 2023-11-03 | 西安微电子技术研究所 | Image pickup method and system, terminal equipment and computer readable storage medium |
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