CN210488290U

CN210488290U - Temperature sampling control system

Info

Publication number: CN210488290U
Application number: CN201921963918.0U
Authority: CN
Inventors: 刘涛
Original assignee: Shanghai Elecon Intelligent Technology Co ltd
Current assignee: Shanghai Elecon Intelligent Technology Co ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-05-08
Anticipated expiration: 2029-11-13

Abstract

The utility model provides a temperature sampling control system, include: the device comprises a power supply module, a multi-channel temperature analog sampling module, an analog selection switch, an isolation module, a controller and an external circuit; the power supply module is used for supplying power to the analog selection switch, the isolation module and the controller; the multi-channel temperature analog sampling module is used for acquiring multi-channel temperature analog quantity; the analog selection switch is used for inputting the temperature analog signal of one analog sampling channel into the isolation module; the isolation module transmits the temperature analog signal to the controller; the controller is used for sending a control instruction to the peripheral circuit according to the received temperature analog signal, and the system adopts a multi-channel analog isolation type sampling system, so that the problems that the accuracy, the safety and the reliability of temperature sampling are influenced because the existing method is easily interfered by electromagnetic interference or energy pulse of a power grid are solved.

Description

Temperature sampling control system

Technical Field

The utility model relates to an electric power supply technical field particularly, relates to a temperature sampling control system.

Background

The reactive power compensation device plays a role in improving the power factor of a power grid in an electric power supply system, reduces the loss of a power supply transformer and a transmission line, improves the power supply efficiency and improves the power supply environment. However, since the reactive power compensation device is in a high-power operation state for a long time, self-heating will be caused, so that the temperature of the internal key components is increased, and therefore the internal key components and the ambient temperature need to be monitored in real time.

In the existing method, if a plurality of mechanical temperature switches are adopted, the temperature cannot be acquired in real time, so that the temperature state of the reactive power compensation device cannot be acquired in real time; some methods adopt a plurality of single channels (or the number of channels is small) for sampling and do not perform isolation, so that the method is easily interfered by electromagnetic interference or energy pulse of a power grid, and the accuracy, safety and reliability of temperature sampling are further influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the utility model provides a temperature sampling control system adopts multichannel analog isolation type sampling system to solve current method and receive the electromagnetic interference or the energy pulse interference of electric wire netting easily, and then influence the accuracy of temperature sampling, security and the problem of reliability.

In order to achieve the above object, the utility model adopts the following technical scheme:

a temperature sampling control system, comprising: the device comprises a power supply module, a multi-channel temperature analog sampling module, an analog selection switch, an isolation module, a controller and an external circuit;

the power supply module is used for supplying power to the analog selection switch, the isolation module and the controller;

the multi-channel temperature analog sampling module comprises a plurality of analog sampling channels and is used for acquiring a plurality of paths of temperature analog quantity;

the analog selection switch is connected between the multi-channel temperature analog sampling module and the isolation module and is used for inputting a temperature analog signal of one analog sampling channel into the isolation module;

the isolation module transmits the temperature analog signal to the controller;

the controller is used for sending a control instruction to the peripheral circuit according to the received temperature analog signal.

In the implementation process, a multichannel analog isolation type temperature sampling system is established by utilizing the power supply module, the multichannel temperature analog sampling module, the analog selection switch, the isolation module, the controller and the peripheral circuit, so that the temperature state of the reactive power compensation device can be known in real time, the action of the peripheral circuit is controlled, for example, the starting and stopping of a fan are controlled, the temperature of the reactive power compensation device is regulated and controlled, and the isolation module is used for carrying out isolation type temperature sampling, so that the electromagnetic interference or energy pulse interference of a power grid is avoided, and the system is safe and reliable; the multi-channel temperature analog sampling module is used for sampling the temperature data of the reactive compensation device in an all-around manner and performing integration processing, so that the accuracy of sampling the temperature of the reactive compensation device is improved, the data processing at the later stage is facilitated, and the cost is reduced; therefore, the problem that the accuracy, safety and reliability of temperature sampling are influenced by electromagnetic interference or energy pulse interference of a power grid easily in the conventional method is solved.

Further, the power supply module includes: the controller comprises an input power supply branch, a first DC-DC converter, a controller power supply branch and a second DC-DC converter;

the input power supply branch is respectively connected with the analog selection switch and the peripheral circuit through a first DC-DC converter;

the controller power supply branch is connected with the controller through a second DC-DC converter.

In the implementation process, the power supply module comprises an input power supply branch and a controller power supply branch, and a two-stage isolation power supply is adopted for supplying power, so that the safety and reliability of power supply are ensured; and a DC-DC isolation power supply is adopted, so that the effects of isolation and protection are achieved.

Further, the isolation module includes:

the first linear optocoupler is connected between the controller and the analog selection switch and used for receiving a temperature analog signal transmitted by the analog selection switch and inputting the temperature analog signal to the controller;

and the second linear optocoupler is connected with the controller and the analog selection switch and is used for sending a gating signal of the controller to the analog selection switch so as to select one analog sampling channel from the plurality of analog sampling channels.

In the implementation process, the second linear optocoupler is used for isolating gating signals, the gating signals are sent to the analog selection switch, after the analog selection switch selects one analog sampling channel in the multi-channel temperature analog sampling module according to the gating signals, the temperature analog signals are sent into the first linear optocoupler for analog linear isolation, and the first linear optocoupler and the second linear optocoupler are used for isolating in the signal selection and sending processes, so that the requirement of the overall isolation of the system is met.

Further, the system further comprises:

the multi-channel temperature digital sampling module comprises a plurality of digital quantity signal sampling channels connected with the controller, is used for collecting temperature digital quantity and inputting the temperature digital quantity to the controller.

In the implementation process, the temperature digital quantity is sampled by the multi-channel temperature digital sampling module, and the multi-channel temperature digital quantity is sampled.

Furthermore, the multichannel temperature digital sampling module comprises an isolation optocoupler and a plurality of digital sampling channels, and the plurality of digital sampling channels are connected with the controller through the isolation optocoupler.

In the implementation process, the peripheral circuit is subjected to digital quantity sampling through a plurality of digital sampling channels such as temperature switches, and then the digital quantity is input into the controller through the isolation optocoupler, so that the sampling and the input of the temperature digital quantity are realized.

Further, the peripheral circuit includes:

and the output end of the relay output module is connected with external equipment and used for controlling the working state of the rear-end equipment.

In the implementation process, the working state of the external equipment is controlled through the relay output module, for example, the external equipment such as a fan is controlled to be started or stopped according to the temperature state of the reactive power compensation device, so that the reactive power compensation device is helped to dissipate heat.

Further, the relay output module comprises a second triode driving module, an optocoupler driving module and a relay module which are connected in sequence and used for controlling the output of signals.

In the implementation process, the optocoupler driving module at the rear end is driven by the second triode driving module, so that a coil of a relay in the relay module is driven, and the external equipment at the rear end is conveniently and stably controlled.

Further, the peripheral circuit includes:

and the digital quantity output module is used for controlling the working state of the back-end equipment.

In the implementation process, the electronic soft switch is used for controlling the rear-end equipment, has higher pressure resistance and longer switching service life, and can be switched frequently.

Furthermore, the digital output module comprises a first triode driving module and a solid-state optical coupling module, and is used for controlling the output of the digital signal.

In the implementation process, the solid-state optocoupler at the rear end is driven by the first triode driving module so as to control rear-end equipment.

Further, the peripheral circuit includes:

and the communication module is used for establishing communication connection between the controller and the back-end equipment and reading back-end equipment information.

In the implementation process, the communication module adopts the isolation power supply to enable the controller to be stably connected with the rear-end equipment, so that the reliability and the stability of a communication loop are improved.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

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

Fig. 1 is a block diagram of a temperature sampling control system according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit structure diagram of a power supply module according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit diagram of an analog sampling channel according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit diagram of an analog selection switch according to an embodiment of the present disclosure;

fig. 5 is a schematic circuit structure diagram of a second linear optocoupler provided in the embodiment of the present application. (ii) a

Fig. 6 is a schematic circuit structure diagram of a first linear optocoupler provided in the embodiment of the present application;

fig. 7 is a schematic circuit structure diagram of a multi-channel temperature digital sampling module according to an embodiment of the present application;

fig. 8 is a schematic circuit structure diagram of a relay output module according to an embodiment of the present application;

fig. 9 is a schematic circuit diagram of a digital output module according to an embodiment of the present disclosure;

fig. 10 is a schematic circuit structure diagram of an RS485 communication module according to an embodiment of the present application.

Description of reference numerals:

100-a multi-channel temperature analog sampling module; 101-analog sampling channel; 200-analog selection switch; 300-a multichannel temperature digital sampling module; 301-isolating optocoupler; 410-a first linear optocoupler; 420-a second linear optocoupler; 500-a controller; 600-a power supply module; 610-input power supply branch; 611-a first DC-DC converter; 620-controller power supply branch; 621-a second DC-DC converter; 710-relay output module; 711-a second triode driving module; 712-optocoupler drive module; 713-a relay module; 720-digital output module; 721-a first triode driving module; 722-a solid state optocoupler module; 730-communication module.

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. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or a point connection; either directly or indirectly through intervening media, or may be an internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

Referring to fig. 1, fig. 1 is a block diagram of a temperature sampling control system according to an embodiment of the present invention.

The system is applied to temperature monitoring of the reactive power compensation device in the power supply system.

By way of example, the system may include:

the system comprises a power supply module 600, a multi-channel temperature analog sampling module 100, an analog selection switch 200, an isolation module, a controller 500, a peripheral circuit and a multi-channel temperature digital sampling module 300.

The power supply module 600 is configured to supply power to the analog selection switch 200, the isolation module, the controller 500, and the peripheral circuit. The peripheral circuit comprises a relay output module 710, a digital quantity output module 720, a communication module 730 and the like. The controller 500 may adopt an MCU control unit to implement control and signal processing of the entire circuit.

The power supply module 600 includes: an input power supply branch 610, a first DC-DC converter 611, a controller power supply branch 620, a first DC-DC converter 621;

the input power supply branch 610 is respectively connected with the analog selection switch 200 and the peripheral circuit through a first DC-DC converter 611;

the controller power supply branch 620 is connected to the controller 500 through a first DC-DC converter 621.

For example, as shown in fig. 2, a schematic diagram of a circuit structure of the power supply module 600 is shown.

The power supply module 600 includes an input power supply branch 610 and a controller power supply branch 620, for example, the power supply module 600 converts 12V into 5V-IN and 5V-MCU two independent and isolated power supplies respectively constituting the input power supply branch 610 and the controller power supply branch 620; the input power supply branch 610 is used for supplying power to the analog selection switch 200, the isolation module and the peripheral circuit; the controller power branch 620 is used to supply power to the controller 500.

The input power supply branch 610 and the controller power supply branch 620 both adopt DC-DC isolated power supplies, and adopt two-stage isolated power supplies to supply power, so that the safety and reliability of power supply are ensured; and a DC-DC isolation power supply is adopted, so that the effects of isolation and protection are achieved.

In addition, the direct-current power supply is connected to the reverse connection prevention protection circuit, and each power supply branch is provided with an independent indicator light for indicating the working state of the corresponding power supply branch.

The multi-channel temperature analog sampling module 100 comprises a plurality of analog sampling channels 101 for collecting multi-channel temperature analog quantity;

for example, as shown in fig. 3, a schematic diagram of a circuit structure of the analog sampling channel 101 is shown.

The number of the analog sampling channels 101 is 16, which can support at most 16 insertion channels, and the input end of each analog sampling channel 101 can be connected with an NTC temperature sensor, so as to convert the temperature data sampled by the NTC temperature sensor into a voltage signal, which is used as the input signal of the multi-channel temperature analog sampling module 100.

The analog selection switch 200 is connected between the multi-channel temperature analog sampling module 100 and the isolation module, and is used for inputting the temperature analog signal of one of the analog sampling channels 101 to the isolation module;

for example, as shown in fig. 4, a schematic diagram of a circuit structure of the analog selection switch 200 is shown. Any one of the 16 analog sampling channels 101 can be selected by the analog selection switch 200 to collect the temperature analog signal. In an example, after the temperature physical quantity collected by the NTC temperature sensor is converted into a voltage signal, 16 optional 1-path operations (specifically, the following second linear optocoupler 420 is implemented) need to be performed through the analog selection switch 200, and then the voltage signal is sent to the MCU control unit for temperature sampling processing.

The isolation module transmits the temperature analog signal to the controller 500;

illustratively, the isolation module includes:

and a second linear optocoupler 420 connected to the controller 500 and the analog selection switch 200 for sending a gating signal of the controller 500 to the analog selection switch 200 to select one analog sampling channel 101 from the plurality of analog sampling channels 101.

As shown in fig. 5, a schematic circuit structure diagram of the second linear optical coupler 420 is shown. During the process that the controller 500 sends the gating signal to the analog selection switch 200, the second linear optocoupler 420 is required to perform isolation, and for example, the second linear optocoupler 420 may be a PC817 photocoupler or an EL817 linear optocoupler.

S0 to S3 in the analog selection switch 200 represent each bit in the 16-ary system, respectively, and the analog selection switch 200 selects the corresponding analog sampling channel 101 from the 16 analog sampling channels 101 through the gating signal sent by the controller 500, where fig. 5 is a schematic circuit structure diagram of the second linear optical coupler 420 where the S0 bit is located, and the circuit structure of the second linear optical coupler 420 of S1 to S3 is the same as that of fig. 5.

The first linear optocoupler 410 is connected between the controller 500 and the analog selection switch 200, and is used for receiving the temperature analog signal transmitted by the analog selection switch 200 and inputting the temperature analog signal to the controller 500;

after 16 paths of selection 1 are performed by using the analog selection switch 200, the temperature analog quantity signal needs to be isolated by analog linearity of the first linear optocoupler 410 and then sent into the controller 500.

As shown in fig. 6, a schematic circuit structure diagram of the first linear optical coupler 410 is shown. Illustratively, the first linear optocoupler 410 is a linear optocoupler HCNR200/201 (high linearity analog optocoupler).

Illustratively, when using HCNR200 to form an isolation amplifier, the front end forms an operational amplifier as a negative feedback amplifier, then detects the amount of LED light output using input photodiode PD1, and automatically adjusts the current through the LED to compensate for the non-linearity caused by variations in LED light output and any other causes, and thus the feedback amplifier is primarily used to stabilize and linearize the LED light output. In addition, an operational amplifier is also required to convert the current and the voltage to convert the stable and linearly changing current output from the output photodiode PD2 into a voltage signal and output the voltage signal.

The multi-channel temperature digital sampling module 300 comprises a plurality of digital quantity signal sampling channels connected with the controller 500, and is used for collecting temperature digital quantity and inputting the temperature digital quantity to the controller 500.

Illustratively, the multi-channel temperature digital sampling module 300 includes an isolation optocoupler 301 and a plurality of digital sampling channels, and the plurality of digital sampling channels are connected to the controller 500 through the isolation optocoupler 301.

For example, as shown in fig. 7, a schematic diagram of a circuit structure of the multi-channel temperature digital sampling module 300 is shown.

In this embodiment, the digital quantity signal sampling channel has 8 ways of digital quantity signal sampling channels, and is isolated by the optical coupler, and can support 8 ways of temperature switch digital quantity sampling.

The sampling of digital quantity is carried out on the reactive compensation device through the temperature switch, and then the sampling and the input of the temperature digital quantity are realized through the isolation optocoupler 301 and the input into the controller 500.

The controller 500 is configured to send a control command to the peripheral circuit according to the received temperature analog signal.

The peripheral circuit includes a relay output module 710, and an output end of the relay output module 710 is connected to an external device, and is used for controlling a working state of a back-end device.

For example, as shown in fig. 8, a schematic diagram of a circuit structure of the relay output module 710 is shown. The relay output module 710 includes a second triode driving module 711, an optocoupler driving module 712 and a relay module 713, which are connected in sequence, and is configured to output a control signal.

The front end adopts a triode to drive a Darlington type optocoupler in the rear end, so that a relay coil is easily driven, and a direct current coil loop of the relay adopts an anti-parallel diode as an absorption loop, so that the relay driving loop is stable and reliable; can support 2 ways, fig. 8 is a circuit structure diagram of one way, and the structure diagram of the other way is the same.

The rear end of the relay output module 710 may be connected to a rear end device to be controlled as required, for example, the start and stop of an external device such as a fan may be controlled according to the temperature state of the reactive power compensation device, so as to help the reactive power compensation device to dissipate heat.

Illustratively, the peripheral circuit further comprises a digital output module 720, and the digital output module 720 is used for controlling the working state of the back-end equipment.

The digital output module 720 includes a first transistor driving module 721 and a solid-state optical coupler module 722, for controlling the output of the digital signal.

For example, as shown in fig. 9, it is a schematic diagram of a circuit structure of the digital output module 720. The front end adopts a triode to drive a rear end Mosfet solid-state optocoupler, so that an interface device at the rear end is controlled, and an electronic soft switch is adopted, so that the high voltage resistance is realized, the switching service life is long, and 2 paths can be supported by frequent switching, wherein fig. 9 is a schematic circuit structure diagram of one path, and a schematic structure diagram of the other path is the same as that of the other path.

The digital output module 720 adopts an electronic switch, can be switched on and off for a large number of times, and is mainly used for controlling a control signal loop in equipment devices such as capacitor switching and the like.

Illustratively, the peripheral circuit further includes a communication module 730 for establishing a communication connection between the controller 500 and the backend device and reading the backend device information.

For example, as shown in fig. 10, it is a schematic diagram of a circuit structure of the RS485 communication module 730. The communication module 730 can adopt an RS485 module integrated with an isolation power supply, so that the reliability of a communication loop is high, and whether a terminal resistor of 120 omega is adopted at the rear end can be selected; the circuit also comprises a TVS (Transient voltage regulator) tube for preventing differential mode interference and common mode interference and a self-recovery fuse PTC for preventing alternating current lapping, so that the whole communication loop is reliable and stable.

VD700 in FIG. 10 is a TVS tube with differential mode protection; VD701 and VD702 are TVS tubes with common-mode protection; the PTC700, 702 is a protection circuit, mainly to prevent damage to the circuit when switched in above normal voltage.

In conclusion, the device realizes isolated sampling through 16 analog sampling channels 101, can also expand the number of the analog sampling channels 101 according to sampling requirements, meets the sampling requirements of a reactive power compensation device, saves cost, performs systematic isolated sampling through multi-channel sampling, is safe and reliable, and solves the problems that the existing method is easily interfered by electromagnetic interference or energy pulses of a power grid, and further influences the accuracy, safety and reliability of temperature sampling.

In all the embodiments described above, the "large" and the "small" are relatively speaking, "more" and "less" are relatively speaking, "upper" and "lower" are relatively speaking, and the description of these relative terms is omitted.

It should be appreciated that reference throughout this specification to "in this embodiment," "in an embodiment of the present invention," or "as an alternative implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in this embodiment," "in an embodiment of the invention," or "as an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are exemplary and alternative embodiments, and that the acts and modules illustrated are not required to practice the invention.

In the various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence necessarily in order, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A temperature sampling control system, the system comprising: the device comprises a power supply module, a multi-channel temperature analog sampling module, an analog selection switch, an isolation module, a controller and an external circuit;

the isolation module transmits the temperature analog signal to the controller;

2. The temperature sampling control system of claim 1, wherein the power module comprises: the controller comprises an input power supply branch, a first DC-DC converter, a controller power supply branch and a second DC-DC converter;

3. The temperature sampling control system of claim 1, wherein: the isolation module includes:

4. The temperature sampling control system of claim 1, further comprising:

5. The temperature sampling control system of claim 4, wherein:

the multichannel temperature digital sampling module comprises an isolation optocoupler and a plurality of digital sampling channels, and the plurality of digital sampling channels are connected with the controller through the isolation optocoupler.

6. The temperature sampling control system of claim 1, wherein the peripheral circuit comprises:

7. The temperature sampling control system of claim 6, wherein:

the relay output module comprises a second triode driving module, an optocoupler driving module and a relay module which are sequentially connected and is used for controlling the output of signals.

8. The temperature sampling control system of claim 1, wherein the peripheral circuit comprises:

9. The temperature sampling control system of claim 8, wherein:

the digital quantity output module comprises a first triode driving module and a solid-state optical coupling module and is used for controlling the output of digital signals.

10. The temperature sampling control system of claim 7, wherein the peripheral circuit comprises: