CN215180829U - Power failure detection circuit and equipment for electric energy meter - Google Patents
Power failure detection circuit and equipment for electric energy meter Download PDFInfo
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- CN215180829U CN215180829U CN202120744726.1U CN202120744726U CN215180829U CN 215180829 U CN215180829 U CN 215180829U CN 202120744726 U CN202120744726 U CN 202120744726U CN 215180829 U CN215180829 U CN 215180829U
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Abstract
The utility model provides a power failure detection circuit and a device for an electric energy meter; the utility model provides a method is applied to electric energy meter power failure detection circuit, electric energy meter power failure detection circuit and treater communication connection; the electric energy meter power failure detection circuit is in communication connection with the processor, and the electric energy meter power failure detection circuit comprises: a first resistor, a second resistor and a third resistor; one end of the first resistor, one end of the second resistor and one end of the third resistor are respectively connected with an alternating current signal sampling module in the processor; the other end of the first resistor is connected with a zero line or a live line, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded. The utility model discloses in because electric energy meter power down detection circuitry, electric energy meter power down detection equipment can gather detection voltage according to predetermineeing acquisition frequency and handle the analysis, has improved the power down detection rate.
Description
Technical Field
The utility model relates to an electric energy meter power down detection technical field, concretely relates to electric energy meter power down detection circuit and equipment.
Background
In the prior art, the power failure detection of the electric energy meter mainly depends on a processor (MCU, Microcontroller Unit), and specifically, a power monitoring circuit is arranged in the MCU or a power comparator is arranged on an IO interface of the MCU to perform the power failure detection of the electric energy meter; for example, the first implementation: detecting the DC output voltage of the AC/DC circuit, and informing the MCU of being in a power-down state after detecting that the voltage is lower than a set voltage, wherein the power-down detection mode takes the normal DC output voltage of the AC/DC circuit as an example and 10V set by the detection voltage as an example, and when the power-down is detected, the energy of an electrolytic capacitor on the DC output is lost by 0.5C (12^2-10^2) joules; the implementation mode two is as follows: the voltage is measured by adopting a metering chip and is used as the voltage for power failure detection, for example: when the measured voltage is lower than 220 × 0.7V, the MCU is informed of being in a power failure state, the updating speed of the effective voltage value of the metering chip is generally 200 and 500ms in normal conditions, the MCU is informed of performing power failure processing after the power failure is delayed by 200 and 500ms, and when the rapid power failure occurs, the metering chip cannot detect a voltage zero-crossing signal and does not output the effective voltage value any more, so that the power failure detection delay is caused.
The power failure detection of the processor is performed through detecting the output end of the power supply circuit, the power failure detection method detects the later power failure time, and further the power failure protection time is shorter, namely the time for outputting the power to a system to normally supply power is shorter after the power supply is disconnected and input, so that the problems that a standby power supply is possibly not connected in time, or a standby battery is under-voltage, or data backup is not in time, and finally data storage is unreliable or the state is disordered and the like cannot be estimated are caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electric energy meter falls electric detection circuitry and equipment aims at solving current electric energy meter and falls electric detection time lag, leads to the untimely technical problem of power fail safeguard.
On one hand, the utility model provides a power-down detection circuit of an electric energy meter,
the electric energy meter power failure detection circuit is in communication connection with the processor, and the electric energy meter power failure detection circuit comprises:
a first resistor, a second resistor and a third resistor;
one end of the first resistor, one end of the second resistor and one end of the third resistor are respectively connected with an alternating current signal sampling module in the processor;
the other end of the first resistor is connected with a zero line or a live line, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded.
The utility model discloses an in some embodiments, electric energy meter falls electric detection circuitry, still includes:
the resistance value of the second resistor is the same as that of the third resistor, and the second resistor and the third resistor divide voltage;
the resistance value of the first resistor is a preset multiple of the resistance value of the second resistor or the resistance value of the third resistor, and the preset multiple is larger than ten.
The utility model discloses an in some embodiments, electric energy meter power down detection circuitry includes electric capacity, the one end of electric capacity with alternating current signal sampling module interface connection in the treater, the other end and ground connection live wire and the zero line of electric capacity.
In some embodiments of the present invention, the first resistor is formed by a plurality of resistors connected in series.
In some embodiments of the present invention, the other end of the first resistor is connected to a zero line or a fire line, the other end of the second resistor is connected to a voltage output module in the processor, and the other end of the third resistor is grounded, including:
the other end of the first resistor is connected with a zero line, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded through a live wire; or the like, or, alternatively,
the other end of the first resistor is connected with a live wire, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded through a zero line.
On the other hand, the utility model provides an electric energy meter power down detection equipment still, electric energy meter power down detection equipment includes:
a power failure detection circuit of the electric energy meter;
one or more processors;
a memory; and
one or more applications, wherein the one or more applications are stored in the memory and configured to perform the power meter power down detection operation by the processor;
the structure of the electric energy meter power failure detection circuit is as described above.
In some embodiments of the present invention, an ac signal sampling module and a voltage output module are disposed in the processor;
the preset acquisition frequency of the alternating current signal sampling module in the processor is set according to the alternating current frequency.
The utility model discloses an in some embodiments, electric energy meter power down detection equipment's treater includes electric energy meter power down detection device, treater and electric energy meter power down detection circuit communication connection, electric energy meter power down detection device includes:
the detection acquisition module is used for acquiring detection voltage acquired by the alternating current signal sampling module in the processor according to a preset acquisition frequency;
the processing and sorting module is used for processing the detection voltages to obtain the lowest effective voltages and arranging the lowest effective voltages according to the acquisition sequence of the respective detection voltages to form an effective voltage sequence;
the voltage counting module is used for acquiring target effective voltages between adjacent zero-crossing points if the effective voltage sequence has the zero-crossing points, and counting the voltage sum of each target effective voltage;
and the comparison output module is used for comparing the voltage sum with a preset reference voltage to obtain a voltage comparison result, and outputting a power failure prompt according to the voltage comparison result.
The utility model discloses an in some embodiments, electric energy meter power down detection device of electric energy meter power down detection equipment includes:
the zero judgment module is used for judging whether two adjacent minimum effective voltages with opposite directions exist in the effective voltage sequence;
the first judging module is used for judging that a zero crossing point exists in the effective voltage sequence if two adjacent minimum effective voltages with opposite directions exist in the effective voltage sequence;
and the second judging module is used for judging that zero-crossing points do not exist in the effective voltage sequence if two adjacent minimum effective voltages with opposite directions do not exist in the effective voltage sequence.
The utility model discloses an in some embodiments, still include in the electric energy meter power down detection device of electric energy meter power down detection equipment:
and the prompt output module is used for outputting a power failure prompt if the zero crossing point does not exist in the effective voltage sequence at a preset time interval.
The utility model discloses in because electric energy meter power down detection circuitry, electric energy meter power down detection circuitry and treater communication connection, electric energy meter power down detection circuitry includes: a first resistor, a second resistor and a third resistor; one end of the first resistor, one end of the second resistor and one end of the third resistor are respectively connected with an alternating current signal sampling module in the processor; the other end of the first resistor is connected with a zero line or a live line, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded; alternating current signal sampling module gathers detection voltage according to predetermineeing acquisition frequency in the treater, predetermine acquisition frequency and be the multiple times of alternating current frequency, a plurality of detection voltage are gathered to such an alternating current cycle, through handling the zero crossing point in confirming the detection voltage sequence to a plurality of detection voltage, the voltage between two adjacent zero crossing points of analysis, thereby confirm whether the electric energy meter falls the electricity in half waveform period of alternating current, the utility model discloses in through the treater to the alternating current to half waveform period's detection voltage carry out the analysis, thereby confirm whether the electric energy meter falls the electricity, improved the efficiency of falling the electricity detection, fall the electricity protection in time when detecting the electricity, avoid effectively because the phenomenon such as data backup delay that the electricity leads to appear.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a specific schematic diagram of a power-down detection circuit of an electric energy meter in the power-down detection device of the embodiment of the present invention;
fig. 2 is a schematic diagram of a specific structure of a power-down detection device of an electric energy meter in the power-down detection device of the electric energy meter provided in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a power down detection circuit of a specific electric energy meter in the power down detection device of the electric energy meter provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of the power-down detection device for an electric energy meter provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the scope of the present invention.
In the description of the present invention, it is to be understood that 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 implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the utility model provides an in provide an electric energy meter falls electric detection circuitry and equipment, the following detailed description that carries out respectively.
The embodiment of the utility model provides an electric energy meter power failure detection circuit, electric energy meter power failure detection circuit is applied to electric energy meter power failure detection device, electric energy meter power failure detection circuit is a part of electric energy meter power failure detection device, electric energy meter power failure detection device sets up in electric energy meter power failure detection equipment, be provided with one or more treater, memory in the electric energy meter power failure detection equipment, and one or more application program, wherein one or more application program is saved in the memory, and configure to and carry out in order to realize electric energy meter power failure detection circuit by the treater; the power failure detection equipment of the electric energy meter can be a detection terminal.
As shown in fig. 1, fig. 1 is the utility model provides a specific schematic diagram of electric energy meter detection circuitry in the electric energy meter falls electric detection equipment, the utility model provides an in the embodiment electric energy meter falls electric detection equipment 100 (the electric energy meter falls electric detection equipment 100 in the integration have the electric energy meter to fall electric detection device), the electric energy meter falls electric detection equipment 100 in the operation electric energy meter and falls the storage medium that corresponds to carry out the electric energy meter and fall the step that electric detection was fallen.
It can be understood that the device that contains in the electric energy meter power down detection equipment in fig. 1 does not constitute the restriction of the embodiment of the present invention, that is, the device quantity, the device kind that contain in the electric energy meter power down detection equipment do not influence the embodiment of the present invention is a whole realization of the technical scheme, all can be counted as the embodiment of the present invention claims the equivalent replacement or derivation of the technical scheme.
The embodiment of the utility model provides an in this electric energy meter power down detection equipment 100 can be independent electric energy meter power down detection equipment, also can be electric energy meter power down detection equipment network or electric energy meter power down detection equipment cluster that electric energy meter power down detection equipment constitutes, for example, the embodiment of the utility model provides an in the described electric energy meter power down detection equipment 100, it includes but not limited to computer, network host, single network electric energy meter power down detection equipment, a plurality of network electric energy meter power down detection equipment collection or the cloud electric energy meter power down detection equipment that a plurality of electric energy meters power down detection equipment constitutes.
Those skilled in the art can understand that the power down detection circuit of the power meter in the power down detection device shown in fig. 1 is only one specific type of the scheme of the present invention, and does not constitute a limitation to the scheme of the present invention, and may further include more or less circuit elements than those shown in fig. 1, for example, only 1 power down detection device of the power meter is shown in fig. 1, and it can be understood that the power down detection circuit of the power meter in the power down detection device of the power meter may further include one or more other power down detection devices, and is not limited herein; the power-down detection device 100 for the electric energy meter may further include a memory for storing the detection voltage collected historically.
Furthermore, the utility model discloses electric energy meter falls electric detection equipment 100 in electric energy meter falls electric detection equipment electric energy meter and falls electric detection circuit's concrete and can set up display device, perhaps does not set up display device and is connected with external display device communication in electric energy meter falls electric detection equipment 100, and display device is arranged in exporting electric energy meter and falls the result that electric detection circuit carried out among the electric detection equipment electric energy meter.
It should be noted that the specific schematic diagram of the electric energy meter power down circuit in the electric energy meter power down detection device shown in fig. 1 is only an example, the embodiment of the utility model provides a what the electric energy meter power down detection device described falls electric energy meter power down detection circuit specifically is for more clear explanation the utility model discloses the technical scheme of the embodiment does not constitute the restriction to the technical scheme that the embodiment of the utility model provides.
Based on electric energy meter power failure detection circuit among the above-mentioned electric energy meter power failure detection equipment, the embodiment of electric energy meter power failure detection circuit has been proposed, electric energy meter power failure detection circuit includes:
a first resistor (R1), a second resistor (R2), and a third resistor (R3);
one end of the first resistor (R1), one end of the second resistor (R2) and one end of the third resistor (R3) are respectively connected with an alternating current signal sampling module in the processor;
the other end of the first resistor (R1) is connected with a zero line or a live line, the other end of the second resistor (R2) is connected with a voltage output module in the processor, and the other end of the third resistor (R3) is grounded.
As shown in fig. 1, the power-down detection circuit of the electric energy meter in this embodiment includes a first resistor (R1), a second resistor (R2), and a third resistor (R3), where one end of the first resistor (R1), the second resistor (R2), and one end of the third resistor (R3) are respectively connected to an ac signal sampling module in the processor, the other end of the first resistor (R1) is connected to a zero line or a fire line, the other end of the second resistor (R2) is connected to a voltage output module in the processor, and the other end of the third resistor (R3) is grounded.
In some embodiments of the present invention, the resistance of the second resistor (R2) and the resistance of the third resistor (R3) are the same, and the second resistor (R2) and the third resistor (R3) are divided;
the resistance value of the first resistor (R1) is a preset multiple of the resistance value of the second resistor (R2) or the resistance value of the third resistor (R3), and the preset multiple is more than ten.
That is, in this embodiment, the resistance of the second resistor (R2) is the same as the resistance of the third resistor (R3), the divided voltages at two ends between the second resistor (R2) and the third resistor (R3) are the same, the voltage at two ends between the second resistor (R2) and the third resistor (R3) is half of the reference voltage output by the voltage output module (VREF, full name: voltageference) in the processor, the resistance of the first resistor (R1) is the resistance of the second resistor (R2) or the predetermined multiple of the resistance of the third resistor (R3), and the predetermined multiple is greater than ten, that is, in this embodiment, the resistance of the first resistor (R1) is much greater than the second voltage and the third voltage, and the voltage of the alternating current of the first resistor (R1), and those skilled in the art can use a plurality of resistors in series as the first resistor (R1).
It can be understood that, in this embodiment of fig. 1, a capacitor (C) is further disposed in the power-down detection of the electric energy meter, the capacitor (C) is used for removing interference, the power-down detection circuit of the electric energy meter includes the capacitor (C), one end of the capacitor (C) is connected to the interface of the alternating-current signal sampling module, and the other end of the capacitor (C) is connected to the ground terminal, so that a person skilled in the art can set required circuit elements according to specific requirements on the premise that the overall efficacy of the power-down detection circuit of the electric energy meter is not affected.
In this embodiment, the other end of the first resistor (R1) is connected to a zero line or a hot line, the other end of the second resistor (R2) is connected to a voltage output module in the processor, and the other end of the third resistor (R3) is connected to ground, including:
the other end of the first resistor (R1) is connected with a zero line, the other end of the second resistor (R2) is connected with a voltage output module in the processor, and the other end of the third resistor (R3) is grounded through a live wire; or the like, or, alternatively,
the other end of the first resistor (R1) is connected with a live wire, the other end of the second resistor (R2) is connected with a voltage output module in the processor, and the other end of the third resistor (R3) is grounded through a zero line.
In this embodiment, the processor is provided with an alternating current signal sampling module (ADC, which is also called an Analog-to-Digital Converter or an Analog-to-Digital Converter), voltage signal sampling is performed at a preset sampling frequency by the alternating current signal sampling module in the processor, the preset sampling frequency is set according to the alternating current frequency, for example, when the frequency of the alternating current in a certain area in china is 50Hz, the preset sampling frequency is set to 1000Hz, so that 20 times of detected voltage can be sampled in a period of an alternating current wave, a program for analyzing the detected voltage is set in the processor, the processor determines zero-crossing points in the detected voltage, and processes and analyzes 10 detected voltages between two adjacent zero-crossing points, so as to determine whether power failure occurs, that is, the power meter power failure detection device analyzes data of the alternating current half wave, the power down detection result can be obtained within 10 ms. The embodiment can quickly determine power failure, meanwhile, the voltage detection precision depends on the precision of the resistor and the sampling precision of the alternating current signal sampling module, the sampling precision is high, and misjudgment conditions are few.
Referring to fig. 2, fig. 2 is a schematic diagram of a specific structure of a power-down detection device of an electric energy meter in the power-down detection device provided in the embodiment of the present invention.
The electric energy meter power failure detection device in the electric energy meter power failure detection equipment in the embodiment comprises:
and the detection acquisition module 201 is configured to acquire a detection voltage acquired by the alternating current signal sampling module in the processor according to a preset acquisition frequency.
In this embodiment, the detection obtaining module 201 in the power-down detection device of the electric energy meter is configured to receive a power-down detection instruction, where a triggering manner of the power-down detection instruction of the electric energy meter is not specifically limited, that is, the power-down detection device may be actively triggered by a user, for example, the user connects the power-down detection device of the electric energy meter to a circuit of the device, and actively triggers the power-down detection instruction; in addition, the power-down detection instruction can also be automatically triggered by the power-down detection equipment of the electric energy meter, for example, the power-down detection instruction is preset in the power-down detection equipment of the electric energy meter and is triggered in real time in the working process of the equipment, the power-down detection equipment of the electric energy meter monitors the state of the equipment, and the power-down detection instruction is automatically triggered when the power-down detection equipment of the electric energy meter detects that the equipment of the electric energy meter works.
After the detection acquisition module 201 in the power-down detection device of the electric energy meter receives the power-down detection instruction, the processor in the power-down detection device of the electric energy meter sends a sampling instruction to the alternating current signal sampling module, and the alternating current signal sampling module samples the detection voltage according to the preset collection frequency, wherein the preset collection frequency of the alternating current signal sampling module in the processor in this embodiment is set according to the alternating current frequency, if the preset collection frequency is greater than the alternating current frequency, the preset collection frequency is in direct proportion to the alternating current frequency, for example, the preset collection frequency is 1000Hz or the preset collection frequency is set to 2000 Hz.
It can be understood that, the electric energy meter falls the detection voltage of half cycle of detection equipment analysis alternating current, confirms whether there is the phenomenon of falling the electricity, crosses lowly and can influence the analysis accuracy if predetermine the collection frequency, and sampling frequency is higher and higher to data processing's hardware requirement, consequently, need set up sampling frequency according to specific demand to realize accurately falling the electricity and detect under the low-cost condition, specifically:
and the processing and sorting module 202 is configured to process the detection voltages to obtain minimum effective voltages, and arrange the minimum effective voltages according to an acquisition sequence of the respective detection voltages to form an effective voltage sequence.
The processing and sorting module 202 in the power-down detection device for the electric energy meter processes the detection voltage to obtain the lowest effective voltage, that is, the power-down detection device for the electric energy meter in the embodiment can directly analyze the detection voltage, but the data calculation amount is large, so that the processing and sorting module 202 converts the detection voltage into the lowest effective voltage, and the power-down detection device for the electric energy meter arranges the lowest effective voltage according to the collection sequence of the respective detection voltages to form an effective voltage sequence.
Specifically, the processing ordering module 202 is configured to perform:
(1) acquiring a reference voltage output by a voltage output module in the processor;
(2) subtracting half of the reference voltage from the detection voltage to obtain the lowest effective voltage, and arranging the lowest effective voltage according to the collection sequence of the respective detection voltages to form an effective voltage sequence.
The processing and sorting module 202 acquires the reference voltage output by the voltage output module in the processor; the reference voltage may be 3.3V, the processing and sorting module 202 subtracts half of the reference voltage from the detected voltage to obtain the lowest effective voltage, and the processing and sorting module 202 arranges the lowest effective voltage according to the collection sequence of the respective detected voltages to form an effective voltage sequence.
In this embodiment, the electric energy meter power failure detection device further includes a zero point determination module after the processing and sorting module 202, where the zero point determination module is configured to execute:
judging whether two adjacent minimum effective voltages with opposite directions exist in the effective voltage sequence;
if two adjacent minimum effective voltages with opposite directions exist in the effective voltage sequence, judging that a zero crossing point exists in the effective voltage sequence;
and if two adjacent minimum effective voltages with opposite directions do not exist in the effective voltage sequence, judging that zero-crossing points do not exist in the effective voltage sequence.
In the embodiment, a zero judgment module in the power failure detection equipment of the electric energy meter judges whether two adjacent minimum effective voltages with opposite directions exist in an effective voltage sequence; if two adjacent minimum effective voltages with opposite directions exist in the effective voltage sequence, the electric energy meter power failure detection equipment judges that a zero crossing point exists in the effective voltage sequence; if two adjacent minimum effective voltages with opposite directions do not exist in the effective voltage sequence, the electric energy meter power failure detection equipment judges that zero crossing points do not exist in the effective voltage sequence.
As can be understood by those skilled in the art, under special conditions, if two minimum effective voltages with opposite directions and adjacent directions do not exist in the effective voltage sequence, the power-down detection device of the electric energy meter further determines whether two zero points exist at intervals in the effective voltage sequence, if two zero points exist at intervals in the effective voltage sequence, the power-down detection device of the electric energy meter determines that a zero-crossing point exists in the effective voltage sequence, and if two zero points do not exist at intervals in the effective voltage sequence, the power-down detection device of the electric energy meter determines that a zero-crossing point does not exist in the effective voltage sequence.
In this embodiment, the alternating current is sine wave (or cosine wave), a half cycle is between two zero points, the electric energy meter power failure detection device determines whether two minimum effective voltages with opposite directions and adjacent exist in an effective voltage sequence, finds a zero crossing point in the effective voltage sequence, extracts a to-be-effective voltage between two adjacent zero points, and analyzes the to-be-effective voltage, thereby realizing voltage data analysis of a half waveform cycle, specifically:
and the voltage counting module 203 is configured to, if a zero crossing point exists in the effective voltage sequence, obtain a target effective voltage between adjacent zero crossing points, and count a voltage sum of each target effective voltage.
If the zero crossing point exists in the effective voltage sequence, a voltage counting module 203 in the electric energy meter power failure detection device acquires target effective voltages between adjacent zero crossing points, and counts the voltage sum of each target effective voltage, that is, the preset sampling frequency is 1000Hz, the target effective voltages between the adjacent zero crossing points are 10, and the voltage counting module 203 counts the 10 target effective voltages to obtain the voltage sum.
And the comparison output module 204 is configured to compare the voltage sum with a preset reference voltage to obtain a voltage comparison result, and output a power failure prompt according to the voltage comparison result.
A reference voltage is preset in a comparison output module 204 in the electric energy meter power failure detection device, and the preset reference voltage is determined according to the rated alternating current voltage of the electric energy meter and an allowable coefficient, namely, the preset reference voltage is the product of the rated alternating current voltage of the electric energy meter and the allowable coefficient, wherein the allowable coefficient is less than 1, for example, the rated working voltage of the electric energy meter is 220V, but the electric energy meter can work at 50% of the rated alternating current voltage of the electric energy meter, and when a power failure detection point is set to 70% of the rated alternating current voltage of the electric energy meter, an AC/DC circuit of the electric energy meter can still normally output direct current at 50% -70% of the rated alternating current voltage of the electric energy meter; therefore, when the preset reference voltage is set, the working voltage can be multiplied by a coefficient, and optionally, the allowable coefficient can be 0.5-0.7. The comparison output module 204 in the power failure detection equipment of the electric energy meter compares the voltage sum with a preset reference voltage to obtain a voltage comparison result, and outputs a power failure prompt according to the voltage comparison result. Specifically, the comparison output module 204 specifically executes:
(1) acquiring the peak voltage or the effective voltage of the zero line or the live line, setting a preset reference voltage according to the peak voltage or the effective voltage, and comparing the voltage sum with the preset reference voltage;
(2) if the voltage sum is larger than the preset reference voltage, continuously monitoring;
(3) and if the voltage sum is less than or equal to the preset reference voltage, outputting a power-down prompt.
In the embodiment, the comparison output module 204 in the power-down detection device of the electric energy meter obtains the peak voltage or the effective voltage of the zero line or the live line, the comparison output module 204 sets a preset reference voltage according to the peak voltage or all the effective voltages, and the power-down detection device of the electric energy meter compares the sum of the voltages with the preset reference voltage; if the voltage sum is larger than the preset reference voltage, a comparison output module 204 in the electric energy meter power failure detection equipment judges that no power failure phenomenon occurs and continuously monitors; if the sum of the voltages is less than or equal to the preset reference voltage, a comparison output module 204 in the electric energy meter power failure detection device judges that a power failure phenomenon occurs, and outputs a power failure prompt if the power failure phenomenon occurs.
The utility model discloses in because electric energy meter power down detection circuitry, electric energy meter power down detection circuitry and treater communication connection, electric energy meter power down detection circuitry includes: a first resistor, a second resistor and a third resistor; one end of the first resistor, one end of the second resistor and one end of the third resistor are respectively connected with an alternating current signal sampling module in the processor; the other end of the first resistor is connected with a zero line or a live line, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded; alternating current signal sampling module gathers detection voltage according to predetermineeing acquisition frequency in the treater, predetermine acquisition frequency and be the multiple times of alternating current frequency, a plurality of detection voltage are gathered to such an alternating current cycle, through handling the zero crossing point in confirming the detection voltage sequence to a plurality of detection voltage, the voltage between two adjacent zero crossing points of analysis, thereby confirm whether the electric energy meter falls the electricity in half waveform period of alternating current, the utility model discloses in through the treater to the alternating current to half waveform period's detection voltage carry out the analysis, thereby confirm whether the electric energy meter falls the electricity, improved the efficiency of falling the electricity detection, fall the electricity protection in time when detecting the electricity, avoid effectively because the phenomenon such as data backup delay that the electricity leads to appear.
The utility model discloses in some embodiments, when specifically stating not having the zero crossing point in the effective voltage sequence, the electric energy meter falls electric detection circuitry and analyzes, promptly, electric energy meter falls electric detection equipment and confirms that half waveform period of alternating current is 10ms, can detect the zero crossing point under the effective voltage sequence 10ms normal conditions under the condition that the electricity falls does not appear, in order to avoid timing error, electric energy meter falls electric detection equipment and sets up the time that is greater than 10ms for presetting the time interval, if preset the time interval do not have the zero crossing point in the effective voltage sequence, then output falls electric prompt, and electric energy meter falls electric detection equipment like this and realizes beginning to fall electric detection.
For convenience of understanding, this embodiment has given specific parameter processing example in the electric energy meter power failure detection circuitry, refer to fig. 3, and fig. 3 is the embodiment of the utility model provides an in the electric energy meter power failure detection equipment in specific electric energy meter power failure detection circuitry's an embodiment structural schematic diagram.
In fig. 3, R1+ R2+ R3+ R4 corresponds to the first resistor in the above embodiment, R11 corresponds to the second resistor in the above embodiment, R12 corresponds to the third resistor in the above embodiment, R11 ═ R12, R1+ R2+ R3+ R4 is much larger than R11, and C1 is used to filter the interference signal on the circuit. The ADC built in the MCU is used for sampling the alternating voltage signal Uo.
(1) Principle analysis
As shown in fig. 3, the following relationship exists for the currents in fig. 3:
through simplification:
since R1+ R2+ R3+ R4 is much larger than R11, the formula is shown in the above
Neglect, then become:
from the above equation, Uo is equivalent to superimposing an ac signal proportional to the Ui signal on the dc component of 0.5 VREF.
(2) And MCU processing procedure:
the built-in ADC of the MCU samples the Uo signal at 1ms intervals and converts it to a digital signal. Taking a 12-bit ADC as an example, the LSB of the full scale is 4095, and 0.5VREF corresponds to a LSB of 2048.
Subtract 2048 from the sampled LSB and record the LSB [ i ]; equivalent to removing 0.5VREF, the following holds:
if the LSB [ i-1] sampled last time is different from the LSB [ i ] sampled this time, the Ui signal is proved to have zero crossing.
Adding all sampling values between two zero crossings: | LSB [ i-10] | + | LSB [ i-9] | + | LSB [ i-8] | + | LSB [ i-7] | … … + | LSB [ i-1]
I.e. equivalent to the half-cycle average Uavg of the Ui signal. (AC 50Hz signal period 20ms, half cycle 10ms, corresponding to 10 sampling points)
And when the MCU detects that Uavg is lower than 70% of the normal input 220V, determining that power is down. The power down signal is delayed by a maximum of 10 ms.
If the zero crossing is not detected for more than 12ms (a certain margin is reserved to avoid the deviation caused by the frequency change), the power failure is directly judged.
It will be appreciated that the LSB represents the last bit in the digital stream and also represents the smallest unit that makes up the full scale input range; for a 12-bit converter, the value of the LSB corresponds to the quotient of the full-scale input range of the analog signal divided by 4096. If expressed in real numbers, a 12-bit converter would have a corresponding LSB size of 1mV for the full scale input range of 4.096V.
In the embodiment, the alternating-current operating voltage range of the electric energy meter is wide, for example, the electric energy meter can still operate under 50% Un (Un is a reference voltage, and is generally 220V). When the power failure detection point is set to be 70% Un, the AC/DC circuit of the electric energy meter can still normally output direct current in the interval of 50% -70% Un, the supporting time is increased, and the risk that a standby power supply is possibly not connected in time, or a standby battery is under-voltage, or data backup is not in time when the power failure occurs is avoided; meanwhile, the detection precision depends on the precision of the resistor and the ADC sampling precision, the sampling precision is high, and misjudgment conditions are few.
Furthermore, for convenience of understanding, in this embodiment, specific parameters are added to the power down detection circuit of the electric energy meter, and VREF is 3.3V, R11 and R12 are 10K Ω, and R1, R2, R3 and R4 are 330K Ω:
is 0.0076, which can be ignored. The following table shows the output voltage of Ui at various voltages Uo.
| Ui(V) | R1+R2+R3+R4(kΩ) | R11/R12(kΩ) | VREF(V) | Uo(V) |
| 0 | 1320 | 10 | 3.3 | 1.65 |
| 311.08 | 1320 | 10 | 3.3 | 2.83 |
| -311.08 | 1320 | 10 | 3.3 | 0.47 |
| 373.296 | 1320 | 10 | 3.3 | 3.064 |
| -373.296 | 1320 | 10 | 3.3 | 0.236 |
311.08V is a positive peak voltage of 220V (220X 1.414)
-311.08V is a positive peak voltage (-220 x 1.414) of 220V voltage
373.296V is 1.2 times the positive peak voltage of 220V (220X 1.2X 1.414)
-373.296V is a positive peak voltage (-220X 1.2X 1.414) of 1.2 times 220V voltage
From the above table, VREF still does not exceed 3.3V at 1.2 times the voltage.
The data in the embodiment can accurately determine the accuracy of the power failure detection of the electric energy meter.
The embodiment of the utility model provides a still provide an electric energy meter power down detection equipment, as shown in FIG. 4, FIG. 4 is the embodiment of the utility model provides an embodiment schematic structure diagram of electric energy meter power down detection equipment that provides.
Electric energy meter falls electric detection equipment and has integrateed the embodiment of the utility model provides an arbitrary kind of electric energy meter falls electric detection device, electric energy meter falls electric detection equipment and includes:
a power failure detection circuit of the electric energy meter;
one or more processors;
a memory; and
the structure of the power failure detection circuit of the electric energy meter is as above;
one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor as steps in the power meter power down detection circuit in any of the above embodiments of power meter power down detection circuits.
Specifically, the method comprises the following steps: the power meter power down detection apparatus may include one or more processing core processors 301, one or more storage medium memories 302, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that the power meter brown-out detection apparatus configuration shown in fig. 4 does not constitute a limitation of the power meter brown-out detection apparatus, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components. Wherein:
the processor 301 is a control center of the power-down detection device for the electric energy meter, connects various parts of the power-down detection device for the whole electric energy meter by using various interfaces and lines, and executes various functions and processing data of the power-down detection device for the electric energy meter by running or executing software programs and/or modules stored in the memory 302 and calling data stored in the memory 302, thereby integrally monitoring the power-down detection device for the electric energy meter. Optionally, processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 301.
The memory 302 may be used to store software programs and modules, and the processor 301 executes various functional applications and data processing by operating the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data created from use of the power meter power down detection apparatus, and the like. Further, the memory 302 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 302 may also include a memory processor to provide the processor 301 with access to the memory 302.
The power-down detection device of the electric energy meter further comprises a power supply 303 for supplying power to each component, and preferably, the power supply 303 can be logically connected with the processor 301 through a power management system, so that functions of managing charging, discharging, power consumption management and the like can be realized through the power management system. The power supply 303 may also include any component of one or more dc or ac power sources, recharging systems, power failure detection circuitry, power converters or inverters, power status indicators, and the like.
The power meter power down detection apparatus may further include an input unit 304, the input unit 304 being operable to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.
Although not shown, the power down detection device of the power meter may further include a display unit and the like, which are not described herein again. Specifically, in this embodiment, the processor 301 in the power-down detection device for the electric energy meter loads an executable file corresponding to a process of one or more application programs into the memory 302 according to the following instructions, and the processor 301 runs the application programs stored in the memory 302, so as to implement various functions as follows:
the detection acquisition module is used for acquiring detection voltage acquired by the alternating current signal sampling module in the processor according to a preset acquisition frequency;
the processing and sorting module is used for processing the detection voltages to obtain the lowest effective voltages and arranging the lowest effective voltages according to the acquisition sequence of the respective detection voltages to form an effective voltage sequence;
the voltage counting module is used for acquiring target effective voltages between adjacent zero-crossing points if the effective voltage sequence has the zero-crossing points, and counting the voltage sum of each target effective voltage;
and the comparison output module is used for comparing the voltage sum with a preset reference voltage to obtain a voltage comparison result, and outputting a power failure prompt according to the voltage comparison result.
It will be understood by those skilled in the art that all or part of the steps in the methods of the above embodiments may be performed by instructions or by instructions controlling associated hardware, and the instructions may be stored in a storage medium and loaded and executed by a processor.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
In a specific implementation, each unit or structure may be implemented as an independent entity, or may be combined arbitrarily to be implemented as one or several entities, and the specific implementation of each unit or structure may refer to the foregoing method embodiment, which is not described herein again.
The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.
The power-down detection circuit of the electric energy meter provided by the embodiment of the present invention is described in detail above, and the specific examples are applied herein to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be some changes in the specific implementation and application scope, and to sum up, the content of the present specification should not be understood as a limitation to the present invention.
Claims (10)
1. The utility model provides an electric energy meter power failure detection circuit, its characterized in that, electric energy meter power failure detection circuit and treater communication connection, electric energy meter power failure detection circuit includes:
a first resistor, a second resistor and a third resistor;
one end of the first resistor, one end of the second resistor and one end of the third resistor are respectively connected with an alternating current signal sampling module in the processor;
the other end of the first resistor is connected with a zero line or a live line, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded.
2. The power-down detection circuit for an electric energy meter according to claim 1,
the resistance value of the second resistor is the same as that of the third resistor, and the second resistor and the third resistor divide voltage;
the resistance value of the first resistor is a preset multiple of the resistance value of the second resistor or the resistance value of the third resistor, and the preset multiple is larger than ten.
3. The power-down detection circuit for the electric energy meter according to claim 1, wherein the power-down detection circuit for the electric energy meter comprises a capacitor, one end of the capacitor is connected with an interface of an alternating current signal sampling module in the processor, and the other end of the capacitor is grounded.
4. The power-down detection circuit for an electric energy meter according to claim 1, wherein the first resistor is formed by connecting a plurality of resistors in series.
5. The power-down detection circuit for the electric energy meter according to any one of claims 1-4, wherein the other end of the first resistor is connected to a zero line or a fire line, the other end of the second resistor is connected to a voltage output module in the processor, and the other end of the third resistor is grounded, comprising:
the other end of the first resistor is connected with a zero line, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded through a live wire; or the like, or, alternatively,
the other end of the first resistor is connected with a live wire, the other end of the second resistor is connected with a voltage output module in the processor, and the other end of the third resistor is grounded through a zero line.
6. The utility model provides an electric energy meter power failure detection equipment which characterized in that, electric energy meter power failure detection equipment includes:
a power failure detection circuit of the electric energy meter;
one or more processors;
a memory; and
one or more applications, wherein the one or more applications are stored in the memory and configured to perform the power meter power down detection operation by the processor;
the structure of the power failure detection circuit of the electric energy meter is as claimed in any one of claims 1 to 5.
7. The power-down detection device for the electric energy meter according to claim 6, wherein an alternating current signal sampling module and a voltage output module are arranged in the processor of the power-down detection device for the electric energy meter;
the preset acquisition frequency of the alternating current signal sampling module in the processor is set according to the alternating current frequency.
8. The power-down detection device for the electric energy meter according to claim 6 or 7, wherein the processor of the power-down detection device for the electric energy meter comprises a power-down detection device for the electric energy meter, the processor is in communication connection with a power-down detection circuit for the electric energy meter, and the power-down detection device for the electric energy meter comprises:
the detection acquisition module is used for acquiring detection voltage acquired by the alternating current signal sampling module in the processor according to a preset acquisition frequency;
the processing and sorting module is used for processing the detection voltages to obtain the lowest effective voltages and arranging the lowest effective voltages according to the acquisition sequence of the respective detection voltages to form an effective voltage sequence;
the voltage counting module is used for acquiring target effective voltages between adjacent zero-crossing points if the effective voltage sequence has the zero-crossing points, and counting the voltage sum of each target effective voltage;
and the comparison output module is used for comparing the voltage sum with a preset reference voltage to obtain a voltage comparison result, and outputting a power failure prompt according to the voltage comparison result.
9. The power-down detection device for the electric energy meter according to claim 8, wherein the power-down detection device for the electric energy meter comprises:
the zero judgment module is used for judging whether two adjacent minimum effective voltages with opposite directions exist in the effective voltage sequence;
the first judging module is used for judging that a zero crossing point exists in the effective voltage sequence if two adjacent minimum effective voltages with opposite directions exist in the effective voltage sequence;
and the second judging module is used for judging that zero-crossing points do not exist in the effective voltage sequence if two adjacent minimum effective voltages with opposite directions do not exist in the effective voltage sequence.
10. The power-down detection device for the electric energy meter according to claim 8, wherein the power-down detection device for the electric energy meter further comprises:
and the prompt output module is used for outputting a power failure prompt if the zero crossing point does not exist in the effective voltage sequence at a preset time interval.
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| CN114794885A (en) * | 2022-04-29 | 2022-07-29 | 佛山市顺德区美的饮水机制造有限公司 | Instant heating water dispenser and outlet water temperature control method, device and storage medium thereof |
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