CN213423311U - Non-invasive load monitoring system - Google Patents
Non-invasive load monitoring system Download PDFInfo
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- CN213423311U CN213423311U CN202021273420.4U CN202021273420U CN213423311U CN 213423311 U CN213423311 U CN 213423311U CN 202021273420 U CN202021273420 U CN 202021273420U CN 213423311 U CN213423311 U CN 213423311U
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Abstract
The utility model relates to a monitoring consumer operating condition's technical field, concretely relates to non-invasive load monitoring system. The monitoring system includes: the data acquisition unit is used for acquiring voltage signals and current signals of the multi-path power transmission line; a signal amplification unit coupled with the data acquisition unit and configured to amplify the input voltage signal and current signal; the AD analog-to-digital conversion unit is coupled with the signal amplification unit, comprises an AD analog-to-digital conversion chip, a power supply module and a decoupling circuit module which is respectively coupled with the AD analog-to-digital conversion chip and the power supply module, and is configured to correspondingly convert the amplified voltage signal and the amplified current signal into digital signals; and the controller is coupled with the AD conversion unit and is configured to analyze the power utilization data according to the received digital signals and display the power utilization data through the display unit so as to be checked by related management and maintenance personnel, thereby ensuring the safety of power utilization and energy-saving transformation.
Description
Technical Field
The utility model relates to a monitoring consumer operating condition's technical field, concretely relates to non-invasive load monitoring system.
Background
With the rapid development of society and the rapid development of science and technology, more and more electrical equipment enters every family. The power transmission line is supplied with larger power supply pressure while life convenience is realized.
Load refers to the power and current passing through wires, cables and electrical equipment. Because the electric devices do not operate simultaneously, even if they operate simultaneously, they do not all reach the rated capacity at the same time. Therefore, the load is not a constant value but a variable value that changes with time.
A series of problems of undervoltage, overlarge power and the like of the power transmission line not only damage electrical equipment to generate property loss, but also threaten life safety.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem, an object of the present invention is to provide a non-invasive load monitoring system.
The embodiment of the utility model provides a non-invasive load monitoring system, monitoring system includes:
the data acquisition unit is used for acquiring voltage signals and current signals of the multi-path power transmission line;
a signal amplification unit, an input end of which is coupled with the data acquisition unit, and configured to amplify the voltage signal and the current signal;
the AD analog-to-digital conversion unit is coupled with the signal amplification unit, comprises an AD analog-to-digital conversion chip, a power supply module and a decoupling circuit module which is respectively coupled with the AD analog-to-digital conversion chip and the power supply module, and is configured to correspondingly convert the amplified voltage signal and the amplified current signal into digital signals;
a controller coupled to the AD conversion unit and configured to receive the digital signal and analyze corresponding power consumption data; and
a display unit coupled with the controller for displaying the electricity consumption data.
Further, the AD analog-to-digital conversion unit comprises a reference voltage module coupled with the analog-to-digital conversion chip.
Further, the signal amplification unit includes:
and the input end of the voltage signal amplification module is coupled with the output end of the data acquisition unit, and the output end of the voltage signal amplification module is coupled with the input end of the AD conversion unit and is used for amplifying the input voltage signal.
Further, the signal amplification unit includes:
and the input end of the current signal amplification module is coupled with the other output end of the data acquisition unit, and the output end of the current signal amplification module is coupled with the other input end of the AD analog-to-digital conversion unit and is used for amplifying the input current signal.
Further, the power supply module adopts a double power supply to supply power.
Further, the controller adopts a single chip microcomputer.
Furthermore, the analog-to-digital conversion chip adopts a chip with the model number AD7606 BSTZ.
Further, the signal amplification unit adopts an AD8513 amplifier.
The utility model discloses following beneficial effect has:
the utility model provides a non-invasive load monitoring system, this monitoring system utilizes the voltage signal and the current signal that signal amplification unit will gather to enlarge to utilize the voltage signal or the current signal conversion after AD analog-to-digital conversion unit will amplify to digital signal, the controller is according to received digital signal analysis power consumption data, and show through the display element, look over with the relevant personnel that supply the management, maintain, and then ensure the safety and the energy-conserving transformation of power consumption.
Drawings
In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or 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 other drawings can be obtained by those skilled in the art without inventive work.
Fig. 1 is a block diagram of a non-invasive load monitoring system according to an embodiment of the present invention;
fig. 2 is a block diagram of an AD/d conversion unit according to an embodiment of the present invention;
fig. 3 is a block diagram of a signal amplifying unit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a voltage signal amplifying module according to another embodiment of the present invention;
fig. 5 is a circuit diagram of a current signal amplifying module according to another embodiment of the present invention;
fig. 6 is a circuit diagram of an AD/a conversion unit according to another embodiment of the present invention;
fig. 7 is a circuit diagram of a first decoupling circuit according to another embodiment of the present invention;
fig. 8 is a circuit diagram of a second decoupling circuit according to another embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the non-invasive load monitoring system according to the present invention with reference to the accompanying drawings and preferred embodiments will be made with reference to the following detailed description of the embodiments, structures, features and effects thereof. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein the term "and/or" includes any and all combinations of one or more of the associated listed items.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a non-invasive load monitoring system according to an embodiment of the present invention is shown, in which the analog sampling device includes a controller 10, an AD/d conversion unit 20, a signal amplification unit 30, a data acquisition unit 40, and a display unit 50.
Specifically, the data acquisition unit 40 is configured to acquire voltage signals and current signals of the multiplex power transmission line. The signal amplification unit 30 is coupled to the data acquisition unit 40 and configured to amplify the acquired voltage and current signals. The AD/a conversion unit 20 is coupled to the signal amplification unit 30, and configured to convert the amplified voltage signal and the amplified current signal into digital signals; the AD/d conversion unit 20 includes an AD/d conversion chip 21, a power supply module 22, and a decoupling circuit module 23 coupled to the AD/d conversion chip 21 and the power supply module 22, respectively. The controller 10 is coupled to the AD analog to digital conversion unit 20 and is configured to analyze the power usage data from the received digital signals. The controller 10 is coupled to the display unit 50 for displaying the electricity usage data.
To sum up, the utility model provides a non-invasive load monitoring system, this sampling device utilize the voltage signal and the electric current of signal amplification unit with the input to amplify, and utilize the voltage signal or the current signal conversion after AD analog-to-digital conversion unit will amplify to digital signal, the controller is according to received digital signal analysis power consumption data, and show this power consumption data through the display, look over with the relevant personnel that supply management, maintain, and then ensure the safety and the energy-conserving transformation of power consumption. The AD analog-to-digital conversion unit comprises an AD analog-to-digital conversion chip and a decoupling circuit module for decoupling a power supply. The decoupling circuit module can remove noise on a power supply pin of an AD analog-to-digital conversion chip, and prevents signals from being coupled to a preceding stage for amplification through a common power supply resistor, so that stable work of each stage of amplification circuits is guaranteed, and self-excitation is eliminated.
Referring to fig. 2, preferably, the AD conversion unit 20 further includes a reference voltage module 24, where the reference voltage module 24 is coupled to the AD conversion chip 21, and when two or more AD conversion chips work simultaneously, the external reference voltage can ensure the consistency of the conversion accuracy of multiple input channels.
It should be noted that, when the data to be monitored is a voltage signal and a current signal, the signal amplifying unit includes a voltage signal amplifying module and a current signal amplifying module.
Referring to fig. 3, preferably, the signal amplifying unit 30 includes a voltage signal amplifying module 31, an input end of the voltage signal amplifying module 31 is coupled to an output end of the data acquiring unit 40, and an output end of the voltage signal amplifying module 31 is coupled to an input end of the AD analog-to-digital converting unit 20, and is configured to amplify an input voltage signal and match impedance.
Referring to fig. 3 again, preferably, the signal amplifying unit 30 includes a current signal amplifying module 32, an input end of the current signal amplifying module 32 is coupled to another output end of the data acquiring unit 40, and an output end of the current signal amplifying module 32 is coupled to another input end of the AD analog-to-digital converting unit 20, and is configured to amplify the input current signal and perform impedance matching.
For better understanding of the present invention, the following description will take monitoring 3 voltage and 4 current signals as examples to further illustrate the embodiments of the present invention.
Specifically, the controller adopts STM32 series single-chip microcomputer, the analog-to-digital conversion chip adopts two analog-to-digital conversion chips AD7606BSTZ, and the signal amplification unit adopts four integrated operational amplifiers AD 8513.
The data acquisition unit comprises a voltage acquisition module and a current acquisition module.
This voltage acquisition module adopts voltage transformer, specifically to in this embodiment, and voltage acquisition module adopts 3 models to be the current type voltage transformer of TV31D respectively, monitors the voltage of each power transmission line in the three-phase electricity.
Referring to fig. 4, in particular, the voltage signal amplifying module is an amplifying module using an integrated operational amplifier as an amplifying device. The A-phase voltage is input to the input end of a voltage transformer through a resistor R60, the output end of the voltage transformer is coupled with the non-inverting input end and the inverting input end of an integrated operational amplifier, a forward conducting diode D6 and a reverse conducting diode D5 are connected between the non-inverting input end and the inverting input end of the integrated operational amplifier, a first feedback branch and a second feedback branch are connected between the inverting input end and the output end of the integrated operational amplifier in a cross-connection mode, the first feedback branch comprises a resistor R61, and the second feedback branch comprises a capacitor C47 and a resistor R62 which are connected in series. The negative power end of the integrated operational amplifier is filtered by a pi-type RC filter consisting of a resistor R64, a capacitor C48 and a capacitor C49. The positive power end of the integrated operational amplifier adopts a pi-type RC filter consisting of a resistor R65, a capacitor C50 and a capacitor C51 for filtering.
When a voltage of 220V is connected to the two ends UA and UN, the voltage signal is converted into a current signal through a resistor R60, see formula 1; the converted current signal is output from the primary side to the secondary side of the current type voltage transformer TV31D and then converted into a voltage signal with a certain amplification ratio by the operational amplifier chip AD8513, and then input into the signal amplification unit 30, please refer to formula 2; diodes D5 and D6 are used for protecting an operational amplifier chip AD8513 in the circuit and preventing the chip from being damaged by overlarge current. R64, R65, C48, C49, C50 and C51 are used for improving the anti-interference performance of the circuit.
I ═ UA/R60 (equation 1);
UA _ INPUT ═ I × R61 (equation 2);
three voltage transformers are used for monitoring voltage signals UA, UB and UC of each phase in three-phase power, and three paths of voltage signals are processed by three voltage signal amplification modules respectively. The circuit structure of each voltage signal amplification module is the same, and the description is omitted.
Referring to fig. 5, the current signal amplifying module and the voltage signal amplifying module have the same circuit connection structure. The integrated operational amplifier adopted in the current signal amplification module is the same as the integrated operational amplifier in the voltage signal amplification module in type, a forward conducting diode D12 and a reverse conducting diode D11 are connected between a non-inverting input end and an inverting input end of the integrated operational amplifier, a first feedback branch and a second feedback branch are connected between the inverting input end and the output end of the integrated operational amplifier in a bridging mode, the first feedback branch comprises a resistor R74 and a resistor R75 which are connected in series, and the second feedback branch comprises a capacitor C57 and a resistor R76 which are connected in series. The positive power end of the integrated operational amplifier adopts a pi-type RC filter consisting of a resistor R78, a capacitor C60 and a capacitor C61 for filtering. The negative power end of the integrated operational amplifier is filtered by a pi-type RC filter consisting of a resistor R77, a capacitor C58 and a capacitor C59.
Referring to fig. 5, in this embodiment, the current collecting module adopts a current transformer, and the current transformer is sleeved on the power transmission line and is used for collecting the current of the power transmission line. The current transformer adopts a current transformer of CTSA0 series. The CTSA0 series current transformer is connected to the two ends of AC _ I1+ and AGND, when current flows through a power transmission line, the large current is converted into small current by using the difference of the number of turns of a primary coil and a secondary coil in the transformer, and measurement and circuit protection are facilitated. The converted small current passes through the operational amplifier chip AD8513 and then is amplified according to a certain proportion, please refer to formula 3; diodes D11 and D12 are used for protecting an operational amplifier chip AD8513 in the circuit and preventing the chip from being damaged by overlarge current. R77, R78, C58, C59, C60 and C61 are used for improving the anti-interference performance of the circuit.
I _ INPUT1 ═ AC _ I1+ (R74+ R75) (equation 3);
monitoring current signals I1-I4 on the four-path cable, and processing the four-path current signals through four current signal amplification modules respectively. The circuit structure of each current signal amplification module is the same, and the description is omitted.
The data acquisition unit selected by the embodiment has the advantages of wide response frequency band, large measurement range, high precision, strong anti-interference capability, quick and convenient installation and disassembly without disconnecting the primary cable to be measured and the like. When the device works specifically, the corresponding sensors collect data by sensing voltage and current changes on the power transmission line, and transmit the collected data information to the AD conversion unit.
Referring to fig. 6, the AD conversion unit is configured to receive the voltage and current information, perform analog-to-digital conversion on the voltage and current information, and transmit the converted data to the controller. The AD analog-to-digital conversion unit adopts an AD7606BSTZ chip as an AD conversion chip, mainly functions to convert an analog signal of voltage and current into a digital signal which can be processed by a controller, and V1-V8 of the AD conversion chip are used as input ports of amplified voltage and current, namely voltage signals UA, UB and UC and input ports of current signals I1-I4. The voltage signal UA is connected as an INPUT signal UA _ INPUT to the pin V6 through the resistor R98, the pin V6GND is grounded through the resistor R99, and the pin V6 and the pin V6GND are connected through the capacitor C74.
Similarly, a voltage signal UB is connected as an INPUT signal UB _ INPUT to the pin V7 through the resistor R100, the pin V7GND is grounded through the resistor R101, and the pin V7 and the pin V7GND are connected through the capacitor C75; the voltage signal UC is connected as an INPUT signal UC _ INPUT to the pin V5 via a resistor R96, the pin V5GND is connected to ground via a resistor R97, and the pin V5 and the pin V5GND are connected via a capacitor C73.
Similarly, current signals I1 to I4 are connected to pins V1 to V4 as INPUT signals I _ INPUT1 to I _ INPUT4 through resistors R94, R90, R88, and R92, respectively, and V1GND to V4GND are grounded through resistors R95, R91, R89, and R93, respectively. Pin V1 is connected with pin V1GND through electric capacity C72, pin V2 is connected with pin V2GND through electric capacity C70, pin V3 is connected with pin V3GND through electric capacity C69, pin V4 is connected with pin V4GND through electric capacity C71.
The internal voltage and current signals of the AD conversion chip are sampled, held, quantized and encoded according to a certain frequency, and converted into digital codes with discrete time and discrete magnitude. The capacitors C69-C81 and the resistors R133 and R134 in FIG. 6 are used for decoupling and filtering to improve the anti-interference performance of the circuit, and the voltage labeled + VREF25_1 provides a reference plane for the normal operation of the chip.
Referring to fig. 7, a power port of the AD conversion chip is connected to a decoupling circuit, an AVCC1 port, an AVCC2 port, and an AVCC3 port of the AD conversion chip are grounded through a first decoupling circuit, respectively, and the first decoupling circuit includes C82 to C85 connected in parallel.
Referring to fig. 8, the VDRIVE port is connected to a second decoupling circuit, which includes C86 and C87 connected in parallel.
The controller is connected with the AD conversion unit and calculates information such as active power, reactive power, frequency and the like by analyzing and calculating voltage and current signals of the data processing device transmission storage unit; and the information is sent to the background server through the network transmission unit and the calculated data information is displayed on the display screen. When voltage and current signals are input, the controller can temporarily store signal data in an internal cache region, an internal calculation unit extracts data from the cache region each time to calculate, and the calculated result is stored in an external FLASH memory to be uploaded and processed uniformly.
The data processed by the controller is sent to the display unit 50 for displaying, and the display unit 50 is a liquid crystal display screen, for example, an OLED dot matrix display screen with a model number of 12864, and is configured to display data information such as acquired voltage, current, power, and frequency.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. A non-intrusive load monitoring system, the monitoring system comprising:
the data acquisition unit is used for acquiring voltage signals and current signals of the multi-path power transmission line;
a signal amplification unit, an input end of which is coupled with the data acquisition unit, and configured to amplify the voltage signal and the current signal;
the AD analog-to-digital conversion unit is coupled with the signal amplification unit, comprises an AD analog-to-digital conversion chip, a power supply module and a decoupling circuit module which is respectively coupled with the AD analog-to-digital conversion chip and the power supply module, and is configured to correspondingly convert the amplified voltage signal and the amplified current signal into digital signals;
a controller coupled to the AD conversion unit and configured to receive the digital signal and analyze power consumption data; and
a display unit coupled with the controller for displaying the electricity consumption data.
2. The system of claim 1, wherein the AD converter unit comprises a reference voltage module coupled to the analog-to-digital converter chip.
3. A non-invasive load monitoring system according to claim 1 or 2, wherein the signal amplification unit comprises:
and the input end of the voltage signal amplification module is coupled with the output end of the data acquisition unit, and the output end of the voltage signal amplification module is coupled with the input end of the AD conversion unit and is used for amplifying the input voltage signal.
4. The non-invasive load monitoring system according to claim 3, wherein said signal amplification unit comprises:
and the input end of the current signal amplification module is coupled with the other output end of the data acquisition unit, and the output end of the current signal amplification module is coupled with the other input end of the AD analog-to-digital conversion unit and is used for amplifying the input current signal.
5. The system of claim 3, wherein the power module is powered by dual power sources.
6. The non-invasive load monitoring system according to claim 1, wherein said controller is a single chip microcomputer.
7. The system of claim 2, wherein the analog-to-digital conversion chip is AD7606 BSTZ.
8. The system of claim 2, wherein the signal amplification unit is an AD8513 amplifier.
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