CN218630565U - Multi-path current switching acquisition device and monitoring equipment thereof - Google Patents

Abstract

The utility model provides a multipath current switching acquisition device and a monitoring device thereof, which comprises a plurality of alternating current access ends, a micro-processing unit, an electric quantity acquisition chip, a plurality of current transformers and a plurality of switch tubes; one said ac input terminal is connected to a mutual inductance input terminal of one said current transformer, and a mutual inductance output terminal of one said current transformer is connected to an input terminal of one said switching tube; the control ends of the switch tubes are respectively connected with the pins of the micro-processing unit, and the output ends of the switch tubes are connected with the same current detection pin of the electric quantity acquisition chip; the output end of the electric quantity acquisition chip is in communication connection with the communication pin of the micro-processing unit, and the electric quantity acquisition chip is used for calculating electric quantity data and sending the electric quantity data to the micro-processing unit to be acquired. The utility model discloses can realize multichannel high accuracy collection, reduce cost again.

Description

Multi-path current switching acquisition device and monitoring equipment thereof

Technical Field

The utility model relates to an electric quantity measuring equipment technical field especially relates to a multichannel current switching collection system and supervisory equipment thereof.

Background

With the development of informatization and the Internet of things, video monitoring is popularized in society and life. Places such as expressways, urban traffic, public places, intersections, villages and the like are managed in a video monitoring mode. In the application scenario of video monitoring, whether the working condition of each piece of front-end electric equipment is normal needs to be detected, except for the situation that part of equipment can judge the working condition through a network, the working condition needs to be judged by combining the working current of corresponding equipment, so that each path of AC220V output needs to have a current acquisition function, and the hardware cost of a terminal needs to be improved to a certain extent.

There are many current collection methods for multi-path AC220V, but these are not ideal or high in cost. If the AD sampling function of the singlechip is utilized, 50hz commercial power is collected and then calculated. The patent adopting the scheme is a Chinese patent with the patent number of 201720524198.2 and the patent name of the Chinese patent is an intelligent power supply controller for monitoring equipment of an electric power substation, and discloses an intelligent power supply controller for monitoring equipment of an electric power substation, which comprises a shell, wherein an ARM single-chip microcomputer module, an AD conversion module, a mains supply state acquisition module, a UPS state acquisition module, a temperature acquisition module, a voltage and current acquisition module, a channel current detection module, a channel overload protection module and a power switch module are arranged in the shell; the rear side of casing is equipped with the rear panel, is equipped with a plurality of module sockets, through-type terminal, ethernet communication module, RS485 communication module and extension output interface on the rear panel, ARM single chip module passes through ethernet communication module and communicates with the host computer. Data monitoring and storage such as a mains supply state, a UPS state, a channel normal state, a channel fault state, temperature, voltage, current and the like can be realized, and stored data are uploaded to an upper computer under the networking condition. Although the scheme is available, the anti-interference performance and the precision are poor, and the acquisition and calculation result of the small current is not ideal.

In other schemes, if a plurality of current chips are used for acquiring multiple paths of current, the accuracy is higher, but more serial port resources and higher hardware cost are needed between the current chips and the main control chip. That is, the current technical solution has no way to achieve the balance between cost and precision.

SUMMERY OF THE UTILITY MODEL

Therefore, a multi-path current switching acquisition device and a monitoring device thereof are needed to be provided, and the problem that the cost and the precision of an existing multi-path current acquisition circuit cannot be balanced is solved.

In order to achieve the above purpose, the utility model provides a multipath current switching and collecting device, which comprises a plurality of alternating current access ends, a micro-processing unit, an electric quantity collecting chip, a plurality of current transformers and a plurality of switch tubes;

one alternating current access end is connected with a mutual inductance input end of one current transformer, and a mutual inductance output end of one current transformer is connected with an input end of one switching tube;

the control ends of the switch tubes are respectively connected with the pins of the micro-processing unit, and the output ends of the switch tubes are connected with the same current detection pin of the electric quantity acquisition chip;

the output end of the electric quantity acquisition chip is in communication connection with the communication pin of the micro-processing unit, and the electric quantity acquisition chip is used for calculating electric quantity data and sending the electric quantity data to the micro-processing unit for acquisition;

the micro-processing unit is used for controlling the conduction and non-conduction states of the switch tube and communicating with the electric quantity acquisition chip to acquire current data;

the current transformer has the functions of current transformation and electric isolation.

In some embodiments, the power supply further comprises a level conversion unit, and the output end of the power acquisition chip is in communication connection with the communication pin of the micro processing unit through the level conversion unit.

In some embodiments, the level conversion unit includes a triode and a resistor, a base of the triode is connected to a positive power supply of the microprocessor unit, an emitter of the triode is connected to an output terminal of the microprocessor unit, a collector of the triode is connected to one end of the resistor and the communication pin of the power acquisition chip, and the other end of the resistor is connected to a positive power supply of the power acquisition chip.

In some embodiments, the power supply further comprises a voltage transformer, an input end of the voltage transformer is connected with the alternating current, and two output ends of the voltage transformer are respectively connected with the two voltage detection pins of the power acquisition chip.

In some embodiments, the power management system further comprises a total input current detection terminal and a total input current transformer, wherein the total input current detection terminal is connected with an input terminal of the total input current transformer, and an output terminal of the total input current transformer is connected with another current detection port pin of the power acquisition chip.

In some embodiments, the communication pin is a serial communication pin.

In some embodiments, the switch tube is an NMOS tube.

The utility model provides a supervisory equipment with multichannel electric current switches collection system, switch collection system including a plurality of monitor probes and many electric currents, multichannel electric current switches collection system does the embodiment of the utility model provides an arbitrary one multichannel electric current switches collection system, the one end of monitor probe's power end is direct with mains connection, the other end of power end passes through multichannel electric current switches collection system's alternating current incoming end again with mains connection.

Different from the prior art, the technical scheme realizes connection with a plurality of alternating current sources needing to collect current through a plurality of current transformers, and can realize access of a plurality of alternating current power supplies. The micro-processing unit can realize the collection of one of them alternating current power supply through opening the switch tube, and the electric current size of gathering sends for the micro-processing unit through the communication pin of micro-processing unit after electric quantity acquisition chip converts the digital signal to realize the collection of micro-processing unit to multichannel alternating current power supply electric current, and the electric current is through electric quantity acquisition chip collection moreover, and the precision is higher, guarantees the accuracy that electric quantity acquisition chip calculated. The whole circuit only needs one electric quantity acquisition chip, and the cost for purchasing the electric quantity acquisition chip is reduced. The microprocessor unit can realize communication only by one group of communication pins without adopting the microprocessor unit with a plurality of groups of communication pins, thereby reducing the cost for purchasing the microprocessor unit.

Drawings

Fig. 1 is a schematic structural view of a multi-path current switching and collecting device of the present invention;

fig. 2 is a schematic diagram of the circuit structure of the electric quantity collecting chip and the current transformer of the multi-path current switching collecting device of the present invention;

fig. 3 is a schematic circuit diagram of a microprocessor unit of the multi-path current switching collecting device of the present invention;

fig. 4 is a schematic circuit structure diagram of the level conversion and voltage acquisition part of the multi-path current switching acquisition device of the present invention;

fig. 5 is a schematic structural diagram of the monitoring device of the present invention having a multi-path current switching collecting device.

Detailed Description

In order to explain technical contents, structural features, objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in combination with the embodiments.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable solution as long as there is no technical contradiction or conflict.

Unless otherwise defined, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe particular embodiments and is not intended to limit the present application.

In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, meaning that three relationships may exist, for example a and/or B, meaning: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".

In this application, terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Without further limitation, in this application, the use of the phrases "comprising," "including," "having," or other similar expressions, is intended to cover a non-exclusive inclusion, and these expressions do not exclude the presence of additional elements in a process, method, or article that includes the elements, such that a process, method, or article that includes a list of elements may include not only those elements defined, but other elements not expressly listed, or may include other elements inherent to such process, method, or article.

As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. Furthermore, the description of embodiments herein of the present application of the term "plurality" means more than two (including two), and the analogous meaning of "plurality" is also to be understood, e.g., "plurality", etc., unless explicitly specified otherwise.

In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are for convenience of description of the specific embodiments of the present application or for ease of understanding by the reader only, and do not indicate or imply that a device or component referred to must have a specific position, a specific orientation, or be configured or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application are to be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated arrangement; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application belongs according to specific situations.

Referring to fig. 1 to 5, the present invention provides a multi-path current switching collecting device, which includes a plurality of AC access terminals (e.g., AC _ L1 to AC _ L5 in fig. 2), a microprocessor unit U5 (which may employ a single chip microcomputer, such as STM32 or STC single chip microcomputer), a power collecting chip U1 (which may employ HT series chips, such as HT 7017), a plurality of current transformers (e.g., components connected to AC _ L1 to AC _ L5 in fig. 2), and a plurality of switching tubes (e.g., MOS tubes in fig. 1 and Q3 to Q7 in fig. 2). One alternating current access end is connected with the mutual inductance input end of one current transformer, and the mutual inductance output end of one current transformer is connected with the input end of one switch tube. The current transformer is provided with two input ends and two output ends, one end of alternating current of current to be detected is connected with one input end of the current transformer, the other input end of the current transformer is connected to one end of a commercial power, and the other end of the alternating current of the current to be detected is directly connected to the other end of the commercial power. Therefore, when the current of the circuit changes, the output end of the current transformer also changes, and then the output end can be collected.

The control ends of the switch tubes are respectively connected with the pins of the micro-processing unit, one control end is connected with one pin, and the output ends of the switch tubes are connected with the same current detection pin (V2P 1) of the electric quantity acquisition chip, namely share one pin. The output end of the electric quantity acquisition chip is in communication connection with communication pins (such as TXD pins and RXD pins in the figure) of the micro-processing unit, and the electric quantity acquisition chip is used for calculating electric quantity data and sending the electric quantity data to the micro-processing unit for acquisition. The micro-processing unit is used for controlling the conduction and non-conduction states of the switch tube and communicating with the electric quantity acquisition chip to acquire current data; the current transformer has the functions of current transformation and electric isolation.

The utility model discloses when using, microprocessor unit need gather which alternating current of the way, just switch on through the switch tube that this way alternating current of control pin control is connected, then through gathering the communication data of electric quantity acquisition chip just can realize this way alternating current electric current's collection. Therefore, the connection with a plurality of alternating current sources needing to collect current is realized through the plurality of current transformers, and the access of a plurality of alternating current power supplies can be realized. The micro-processing unit can realize the collection of one of them alternating current power supply through opening the switch tube, and the electric current size of gathering sends for the micro-processing unit through the communication pin of micro-processing unit after electric quantity acquisition chip converts the digital signal to realize the collection of micro-processing unit to multichannel alternating current power supply electric current, and the electric current is through electric quantity acquisition chip collection moreover, and the precision is higher, guarantees the accuracy that electric quantity acquisition chip calculated. The whole circuit only needs one electric quantity acquisition chip, and the cost for purchasing the electric quantity acquisition chip is reduced. The micro-processing unit can realize communication only by one group of communication pins without adopting the micro-processing unit with multiple groups of communication pins, so that the cost for purchasing the micro-processing unit is reduced.

Owing to adopted the electric quantity acquisition chip, the utility model discloses have the higher effect of sampling precision, avoid the non-linear problem. Meanwhile, the effect of saving the performance resources of the microprocessing unit can be achieved, and the condition of a large amount of time consumed in AD acquisition through the microprocessing unit is avoided. Meanwhile, the processing flow of the micro-processing unit is not complex, the micro-processing unit only needs one serial port and a plurality of IO ports, and complex calculation is not needed. And the current transformer with commercial power input protection isolates strong current and weak current, can ensure the use safety of electric equipment and prevent the damage of the electric equipment.

If the level of the electric quantity acquisition chip is consistent with that of the microprocessing unit, a serial port can be directly connected, and RXD and TXD of the electric quantity acquisition chip are respectively connected to TXD pins and RXD pins of the microprocessing unit. If the levels are not consistent, level conversion is required, and in some embodiments, as shown in fig. 4, a level conversion unit (a unit corresponding to the transistors Q1 and Q2) is further included, and the output end of the power acquisition chip is in communication connection with the communication pin of the microprocessor unit through the level conversion unit. Therefore, the voltage conversion of the communication between the electric quantity acquisition chip and the micro-processing unit can be realized, and the problem of level mismatching between the electric quantity acquisition chip and the micro-processing unit is avoided.

The level conversion unit may be implemented in a chip, such as NLSX4373. In some embodiments, the level conversion unit may be implemented by discrete components, as shown in fig. 4, the level conversion unit includes a transistor and a resistor, a base of the transistor is connected to the positive power supply of the micro processing unit, a transmitter of the transistor is connected to the output terminal (TXD 2) of the micro processing unit, a collector of the transistor is connected to one end of the resistor and the communication pin (HT _ RXD 1) of the power harvesting chip, and another end of the resistor is connected to the positive power supply of the power harvesting chip. Therefore, when the microprocessing unit outputs a high level, the triode is cut off, HT _ RXD1 is pulled to the voltage which is the same as the power supply voltage of the electric quantity acquisition chip by the positive electrode of the electric quantity acquisition chip, and when the microprocessing unit outputs a low level, the triode is switched on, and HT _ RXD1 is pulled to the positive electrode of the low level, so that the level conversion is realized. When there are a plurality of communication pins, connection can be made with reference to fig. 4.

In some embodiments, the power management system further comprises a voltage transformer (P1 in fig. 4), an input end of the voltage transformer is connected with the alternating current, and two output ends of the voltage transformer are respectively connected with two voltage detection pins (V3N 1, V3P 1) of the power acquisition chip. Through the voltage transformer, the collection of the alternating current voltage can be realized.

In some embodiments, as shown in fig. 4, the power management system further includes a total input current detection terminal (AC _ LI) and a total input current transformer T1, wherein the total input current detection terminal is connected to an input terminal of the total input current transformer, and an output terminal of the total input current transformer is connected to another current detection port pin (V1N 1, V1P 1) of the power acquisition chip. Two voltage detection of electric quantity collection chip and total input current transformer's current detection realize total input commercial power monitoring, and these above-mentioned two passageway sampling of accessible, electric quantity collection measurement chip inside can calculate and use relevant data such as electric quantity, commercial power frequency, active power, reactive power, apparent power to the realization is to the data acquisition of commercial power comprehensive conditions.

The utility model discloses not inject communication mode, according to the different of electric quantity collection chip can select different communication modes, in some embodiments, communication pin is serial ports communication pin, and the serial ports is comparatively general, realizes simply. The utility model discloses do not restrict the switch tube type, if can be transistor or relay, in certain embodiments, the switch tube is the NMOS pipe, and NMOS pipe switching speed is very fast, can realize better switching action.

It should be noted that, the utility model discloses a chip (electric quantity collection chip, microprocessing unit) need carry out the direct current voltage power supply, and the direct current voltage power supply can adopt the commercial power to change direct current transformer's mode, perhaps adopts the battery then to supply power after carrying out voltage conversion through voltage stabilizing chip or DCDC chip. The voltage conversion can be performed by multi-stage conversion, such as first reducing the voltage to a voltage, such as 12V, and then reducing the voltage to the working voltage of the chip, such as 3.3V or 5V. These voltage conversions all have relatively mature existing circuits, and can be directly realized by adopting the existing circuits.

The utility model provides a supervisory equipment with multichannel current switching collection system, as shown in fig. 5, including a plurality of monitor probes (monitor probe 1 to N) and many current switching collection system, multichannel current switching collection system does the embodiment of the utility model provides an arbitrary one multichannel current switching collection system, the one end of monitor probe's power end is direct and mains connection, the other end of power end passes through the alternating current incoming end of multichannel current switching collection system again with mains connection. Therefore, the monitoring probes which need to acquire current are connected through the plurality of current transformers, and multiple paths of access of alternating current power supplies of the monitoring probes can be achieved. The micro-processing unit can realize the collection of one of them monitor alternating current power supply through opening the switch tube, and the electric current size of gathering sends for the micro-processing unit through the communication pin of micro-processing unit after electric quantity acquisition chip converts the digital signal to realize the collection of micro-processing unit to multichannel alternating current power supply electric current, and the electric current is gathered through the electric quantity acquisition chip moreover, and the precision is higher, guarantees the accuracy that the electric quantity acquisition chip calculated. The whole circuit only needs one electric quantity acquisition chip, and the cost for purchasing the electric quantity acquisition chip is reduced. The microprocessor unit can realize communication only by one group of communication pins without adopting the microprocessor unit with a plurality of groups of communication pins, thereby reducing the cost for purchasing the microprocessor unit.

It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the protection scope of the present invention.

Claims (8)

1. The utility model provides a multichannel current switching collection system which characterized in that: the system comprises a plurality of alternating current access ends, a micro-processing unit, an electric quantity acquisition chip, a plurality of current transformers and a plurality of switch tubes;

one alternating current access end is connected with a mutual inductance input end of one current transformer, and a mutual inductance output end of one current transformer is connected with an input end of one switching tube;

the control ends of the switch tubes are respectively connected with the pins of the micro-processing unit, and the output ends of the switch tubes are connected with the same current detection pin of the electric quantity acquisition chip;

the output end of the electric quantity acquisition chip is in communication connection with a communication pin of the micro-processing unit, and the electric quantity acquisition chip is used for calculating electric quantity data and sending the electric quantity data to the micro-processing unit for acquisition;

the micro-processing unit is used for controlling the conduction and non-conduction states of the switch tube and communicating with the electric quantity acquisition chip to acquire current data;

the current transformer has the functions of current transformation and electric isolation.

2. The multi-path current switching acquisition device according to claim 1, wherein: the output end of the electric quantity acquisition chip is in communication connection with the communication pin of the micro-processing unit through the level conversion unit.

3. The multi-path current switching acquisition device according to claim 2, wherein: the level conversion unit comprises a triode and a resistor, the base of the triode is connected with the power supply anode of the micro-processing unit, the emitter of the triode is connected with the output end of the micro-processing unit, the collector of the triode is connected with one end of the resistor and the communication pin of the electric quantity acquisition chip, and the other end of the resistor is connected with the power supply anode of the electric quantity acquisition chip.

4. The multi-path current switching acquisition device according to claim 1, wherein: the power acquisition chip is characterized by further comprising a voltage transformer, wherein the input end of the voltage transformer is connected with alternating current, and two output ends of the voltage transformer are respectively connected with two voltage detection pins of the power acquisition chip.

5. The multi-path current switching acquisition device according to claim 4, wherein: the power supply circuit also comprises a total input current detection end and a total input current transformer, wherein the total input current detection end is connected with the input end of the total input current transformer, and the output end of the total input current transformer is connected with another current detection port pin of the electric quantity acquisition chip.

6. The multi-path current switching acquisition device according to claim 1, wherein: the communication pin is a serial port communication pin.

7. The multi-path current switching acquisition device according to claim 1, wherein: the switch tube is an NMOS tube.

8. The utility model provides a supervisory equipment with multichannel current switching collection system which characterized in that: the multi-path current switching and collecting device comprises a plurality of monitoring probes and a plurality of current switching and collecting devices, wherein the multi-path current switching and collecting device is as defined in any one of claims 1 to 7, one end of a power end of each monitoring probe is directly connected with a mains supply, and the other end of the power end of each monitoring probe is connected with the mains supply through an alternating current access end of the multi-path current switching and collecting device.

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