CN114879575A

CN114879575A - Control system of fan filter unit

Info

Publication number: CN114879575A
Application number: CN202210618709.2A
Authority: CN
Inventors: 杨郝楠
Original assignee: Chengdu Reboke Material Technology Co ltd
Current assignee: Chengdu Reboke Material Technology Co ltd
Priority date: 2022-06-01
Filing date: 2022-06-01
Publication date: 2022-08-09

Abstract

The application discloses control system of fan filter unit includes: the system comprises a client, a control module and at least one FFU (fan filter unit), wherein the control module comprises a signal transmitting and receiving circuit, an MCU (microprogrammed control unit) main control circuit and an output expansion circuit with a plurality of signal output ports; the client is connected with the signal transmitting and receiving circuit in a wireless connection mode, the signal transmitting and receiving circuit is connected with the MCU main control circuit, the MCU main control circuit is in communication connection with the output expansion circuit, and each FFU is connected with one signal output port; the system comprises a client side, an MCU main control circuit and a signal transmitting and receiving circuit, wherein the client side transmits a control instruction to the MCU main control circuit through the signal transmitting and receiving circuit, and the control instruction comprises identification information and a control gear of an FFU to be controlled in at least one FFU; the MCU main control circuit identifies the FFU to be controlled through the identification information, and controls the gear of the FFU to be controlled to be adjusted to a control gear through a signal output port of the output expansion circuit corresponding to the FFU to be controlled.

Description

Control system of fan filter unit

Technical Field

This application belongs to clean equipment technical field, concretely relates to fan filter unit's control system.

Background

The Fan Filter Unit (FFU) has the advantages of long working time, stepless speed regulation, uniform wind speed, convenient installation and the like, and is widely applied to occasions such as a dust-free room, a dust-free operation table, a dust-free production line, an assembled dust-free room, a local hundred-grade dust-free workshop and the like.

In a laboratory clean room environment, a large batch of FFUs, for example, tens of FFUs and hundreds of FFUs, are usually required to operate simultaneously, and all FFUs need to be controlled and monitored in real time to meet certain experimental requirements of the laboratory clean room. The existing control and monitoring is generally controlled and monitored by a computer fixed in a clean room of a laboratory, so that a control end is inconvenient to carry and operate, the purpose of operation along with walking in the clean room of the laboratory cannot be realized, and the number of FFUs which can be borne by a current control system is small.

Disclosure of Invention

The embodiment of the application provides a control system of fan filter unit to solve current FFU control system and in carrying out the control operation process to FFU, can not follow the walking along with the operation lead to the problem of operation inconvenient.

In a first aspect, an embodiment of the present application provides a control system for a fan filter unit, including:

the system comprises a client, a control module and at least one fan filter unit FFU, wherein the control module comprises a signal sending and receiving circuit, a micro control unit MCU main control circuit and an output expansion circuit with a plurality of signal output ports;

the client side and the signal transmitting and receiving circuit are in bidirectional communication connection in a wireless connection mode, the signal transmitting and receiving circuit is in bidirectional communication connection with the MCU main control circuit, the MCU main control circuit is in communication connection with the output expansion circuit, and each FFU is connected with one signal output port;

the MCU master control circuit receives a control instruction sent by the client through the signal sending and receiving circuit, wherein the control instruction comprises identification information and a control gear of an FFU to be controlled in at least one FFU; the MCU main control circuit identifies the FFU to be controlled through the identification information, and controls the gear of the FFU to be controlled to be adjusted to the control gear through a signal output port connected with the FFU to be controlled.

In one implementation manner, the control module further includes gear output circuits with the same number as the FFUs, each of the gear output circuits is connected to one of the FFUs in a one-to-one correspondence manner, and each of the gear output circuits is connected to one of the signal output ports in a corresponding manner;

after the MCU master control circuit identifies the FFU to be controlled, based on the corresponding connection relation among the FFU, the gear output circuit and the signal output port, the control instruction is output to the gear output circuit connected with the FFU to be controlled through the signal output port corresponding to the FFU to be controlled, and the gear output circuit controls the gear of the FFU to be controlled to be adjusted to the control gear.

In one implementation manner, each gear output circuit is further in communication connection with the MCU main control circuit;

after the gear output circuit connected with the FFU to be controlled controls the gear of the FFU to be controlled to be adjusted to the control gear, the gear output circuit connected with the FFU to be controlled feeds back the execution condition of the control instruction to the MCU main control circuit, the MCU main control circuit sends the execution condition to the client through the signal sending and receiving circuit, and the client displays the current gear of the FFU to be controlled.

In one implementation, the output expansion circuit is connected with all the gear output circuits through flat cables.

In one implementation mode, the MCU master control circuit, the output expansion circuit and the signal transmitting/receiving circuit are disposed on the first circuit board, and the gear output circuit is disposed on the second circuit board.

In one implementation, the control system further includes a buck-regulator module, configured to perform buck-regulation on the voltage of the external power supply, and output the voltage after the buck-regulation to the control module.

In one implementation manner, the voltage reduction and stabilization module includes a voltage reduction and stabilization circuit and an output interface, the voltage reduction and stabilization circuit is connected with a voltage dependent resistor and a safety circuit connected in parallel through a common mode inductor, the external power supply is connected in series with a fuse, the voltage dependent resistor is connected in parallel with the fuse and the external power supply connected in series, and the voltage reduction and stabilization circuit is connected with the control module through the output interface.

In one implementation manner, the number of the output interfaces is two, the voltage reduction and stabilization circuit is connected with the two output interfaces through a control switch, one of the output interfaces is used for supplying power to a first circuit board, and the other output interface is used for supplying power to a second circuit board;

and under the condition that the control switch is closed, the two output interfaces output the voltage after voltage reduction and stabilization.

In one implementation, the buck-boost module further includes a power indicator connected to the control switch, and the power indicator is turned on when the control switch is turned on.

In one implementation, the output expansion circuit includes N MCP23017 chips, each MCP23017 chip corresponds to 16 signal output ports, and N is a positive integer greater than or equal to 1.

In this application embodiment, fan filter unit's control system includes: the system comprises a client, a control module and at least one fan filter unit FFU, wherein the control module comprises a signal sending and receiving circuit, a micro control unit MCU main control circuit and an output expansion circuit with a plurality of signal output ports; the client side and the signal transmitting and receiving circuit are in bidirectional communication connection in a wireless connection mode, the signal transmitting and receiving circuit is in bidirectional communication connection with the MCU main control circuit, the MCU main control circuit is in communication connection with the output expansion circuit, and each FFU is connected with one signal output port; the MCU master control circuit receives a control instruction sent by the client through the signal sending and receiving circuit, wherein the control instruction comprises identification information and a control gear of an FFU to be controlled in at least one FFU; the MCU main control circuit identifies the FFU to be controlled through the identification information, and controls the gear of the FFU to be controlled to be adjusted to the control gear through a signal output port connected with the FFU to be controlled. The client is in wireless connection with the signal sending and receiving circuit, so that short-distance wireless control can be realized, the purpose of follow-up control can be realized, the client is easy to carry, heavy terminal equipment is separated, and the requirement of a laboratory on the environment in an ultra-clean room is met; in addition, the fact that the client can control a plurality of FFUs is achieved through the output expansion circuit, and the number of the controlled FFUs is increased.

Drawings

FIG. 1 is a schematic structural diagram of a control system of a fan filter unit in an embodiment of the present application;

FIG. 2 is a schematic diagram of an output expansion circuit in an embodiment of the present application;

FIG. 3 is another schematic diagram of a control system of a fan filter unit according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a buck-regulator module according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an interface schematic diagram of a client in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The control system of the fan filter unit provided by the embodiment of the present application is described in detail by specific embodiments with reference to the accompanying drawings.

Fig. 1 illustrates a control system of a fan filter unit according to an embodiment of the present invention, where the control system of the fan filter unit includes:

the system comprises a client 1, a control module 2 and at least one FFU3, wherein the control module comprises a signal transmitting and receiving circuit 21, a Micro Control Unit (MCU) master control circuit 22 and an output expansion circuit 23 with a plurality of signal output ports;

the client 1 and the signal transmitting and receiving circuit 21 are in bidirectional communication connection in a wireless connection manner, the signal transmitting and receiving circuit 21 is in bidirectional communication connection with the MCU main control circuit 22, the MCU main control circuit 22 is in communication connection with the output expansion circuit 23, and each FFU3 is connected to one of the signal output ports;

the MCU main control circuit 22 receives a control instruction sent by the client 1 through the signal sending and receiving circuit 21, where the control instruction includes identification information and a control gear of an FFU to be controlled in at least one FFU; the MCU main control circuit 22 identifies the FFU to be controlled through the identification information, and controls the gear of the FFU to be controlled to be adjusted to the control gear through the signal output port connected to the FFU to be controlled.

Specifically, the client may be a mobile terminal, and the signal sending and receiving circuit may be an existing signal transmission module, such as a bluetooth module, a 2.4G module, a WIFI module, and the like; the client side and the signal sending and receiving circuit in the control module are in bidirectional communication connection in a wireless connection mode, and the wireless connection mode can be a WIFI connection mode or a Bluetooth connection mode. The client side is in wireless connection with the control module, short-distance wireless control can be achieved, the purpose of follow-up control is achieved, the client side is easy to carry, heavy terminal equipment is separated, and the requirement of a laboratory on the environment in an ultra-clean room is met.

In addition, the MCU master control circuit is in bidirectional communication connection with the signal sending and receiving circuit through serial port communication, and the baud rate can be set to 9600bps, so that the transmission effect is stable.

Specifically, the MCU master control circuit may be an existing single chip, that is, may be capable of receiving a control command sent by the client. For example, as an example, it is assumed that the MCU master control circuit is an stc89c52 single chip microcomputer, an RXD pin and a TXD pin of the stc89c52 single chip microcomputer are connected with a TXD pin and an RXD pin of a signal transmitting and receiving circuit (e.g., a bluetooth module), and the bluetooth module receives a control instruction transmitted by a client and transmits the control instruction to the MCU master control circuit in a serial port communication manner.

And the MCU main control circuit identifies the FFU to be controlled through the identification information and identifies the control gear of the FFU to be adjusted. For example, as an example, the control command (i.e. the transmission data) is exemplified by an eight-bit binary system, the first five bits can be used as the identification information (e.g. FFU sequence number encoding bit) of the FFU to be controlled, and the last three bits can be used as the control gear. When the control instruction reaches the MCU main control circuit, the first five bits and the last three bits of the control instruction are respectively extracted through logic programming, and the FFU to be controlled by the control instruction can be obtained by corresponding the information of the first five bits to the serial number which is compiled in advance of the actual FFU; the last three positions correspond to FFU gear information, namely control gears, and corresponding gears of the controlled FFU are obtained by contrasting the gear information compiled in advance.

In addition, the output expansion circuit has a plurality of signal output ports, for example, the output expansion circuit may include a plurality of MCP23017 chips. Each FFU is connected with one signal output port, so that the control system can simultaneously control a plurality of FFUs through the output expansion circuit of the control module, and a large number of FFUs can be borne.

Through the connection, the MCU main control circuit receives the control instruction sent by the client through the signal sending and receiving circuit, wherein the control instruction comprises identification information and a control gear of the FFU to be controlled in at least one FFU. The MCU main control circuit can decrypt the received data after receiving the control signaling, obtains the identification information and the control gear of the FFU to be controlled after decryption is completed, and controls the gear of the FFU to be controlled to be adjusted to the control gear through the signal output port of the output expansion circuit corresponding to the FFU to be controlled.

In addition, specifically, the output expansion circuit includes N MCP23017 chips, each MCP23017 chip corresponds to 16 signal output ports, and N is a positive integer greater than or equal to 1.

For example, as shown in fig. 2, the number of N may be 8, that is, the output expansion circuit may use 8 MCP23017 chips for output expansion, and at this time, 128 output ports may be expanded. Because the MCP23017 chip adopts an Inter-Integrated Circuit (IIC) communication mode, the MCU main control Circuit can be in bidirectional communication connection with the output expansion Circuit through IIC communication, and 8 MCP23017 chips share one set of IIC channels, at this time, IIC communication only occupies 2 input/output (I/O for short) ports of the MCU main control Circuit, thus leaving an adequate control interface for the addition of subsequent devices; in addition, the MCU master control circuit is connected with the signal transmitting and receiving circuit in a serial port communication mode, and the signal transmitting and receiving circuit, the MCU master control circuit and the output expansion circuit can be connected with the same power input interface.

In one implementation, as shown in fig. 3, the control module further includes gear output circuits 24 with the same number as the FFUs, each gear output circuit 24 is connected to one of the FFUs 3 in a one-to-one correspondence manner, and each gear output circuit 24 is connected to one of the signal output ports in a corresponding manner;

Specifically, when the FFU is to be controlled, the gear output circuit can comprise a relay, an I/O port of the MCU master control circuit establishes communication with the output expansion circuit through analog IIC communication, an output pin of an MCP23017 chip in the output expansion circuit is connected with each relay of the gear output circuit, the relay controls the on-off of a specific gear of the FFU, and when the MCU master control circuit identifies the FFU to be controlled, the MCU master control circuit directly controls the level of a pin of one MCP23017 chip in an IIC communication mode, and then the pull-in and the break-off of the relay are driven to control the FFU.

Specifically, the number of the gear output circuits is the same as that of the FFUs, namely, one gear control circuit controls one FFU; each gear output circuit is correspondingly connected with one signal output port, and the output expansion circuit is in one-way communication connection with each gear output circuit through the signal output port, so that the MCU control circuit can control a plurality of FFUs through one output expansion circuit.

In the process of controlling the FFU through the output expansion circuit and the gear output circuit, the MCU control circuit can output a control instruction to the gear output circuit connected with the FFU to be controlled through the signal output port corresponding to the FFU to be controlled through the corresponding connection relation among the FFU, the gear output circuit and the signal output port, and the gear output circuit controls the gear of the FFU to be controlled to be adjusted to a control gear, so that the FFU in the FFUs is differentially controlled.

Optionally, the output expansion circuit is connected with all the gear output circuits through a flat cable, so that each path of signal can not interfere with each other, the output expansion circuit can be expanded in a large batch, and fewer chip resource ports of the MCU main control circuit are occupied.

In addition, in an implementation manner, with continued reference to fig. 3, each of the gear output circuits is further in communication connection with the MCU main control circuit;

Specifically, each gear output circuit 24 is in communication connection with the MCU main control circuit 22, so that the gear output circuit 24 corresponding to the FFU to be controlled can feed back the execution condition of the control instruction to the MCU main control circuit 22, the MCU main control circuit encrypts the execution condition and sends the encrypted execution condition to the client through the signal sending and receiving circuit 21, and the client displays the current gear of the FFU to be controlled, so that the user can know the current gear of the FFU to be controlled through the displayed gear information.

Of course, the client may obtain the current gear of the FFU to be controlled at that time by clicking a preset state refresh button.

In addition, in an implementation manner, the MCU main control circuit, the output expansion circuit and the signal transmitting/receiving circuit are disposed on the first circuit board, and the gear output circuit is disposed on the second circuit board. The design of separating the two circuit boards can not only prevent signal interference, but also separate a weak current end from a strong current end.

In addition, in an implementation manner, with continued reference to fig. 3, the control system further includes a voltage-reducing and voltage-stabilizing module, configured to reduce and stabilize the voltage of the external power source, and output the reduced and stabilized voltage to the control module 2.

Optionally, referring to fig. 4, the voltage reducing and stabilizing module includes a voltage reducing and stabilizing circuit and an output interface, the voltage reducing and stabilizing circuit is connected to a voltage dependent resistor and a safety circuit connected in parallel through a common mode inductor, the external power supply is connected in series to a fuse, the voltage dependent resistor is connected in parallel to the fuse and the external power supply connected in series, and the voltage reducing and stabilizing circuit is connected to the control module through the output interface. This enables the input voltage of the control module to be regulated and reduced.

Specifically, the output interface may be a 5V output interface, and the external power supply is 220V ac power.

In addition, the power interface of the control module can be a DC power socket with the inner diameter of 1.3mm, and corresponds to the socket of the 5V output interface of the voltage reduction and stabilization circuit; the voltage reduction and stabilization module and the control module are designed separately, and the redevelopment of equipment is facilitated.

In addition, optionally, with reference to fig. 4, the number of the output interfaces is two, the step-down voltage stabilizing circuit is connected to the two output interfaces through a control switch (corresponding to the toggle switch in fig. 4), and one of the output interfaces is used for supplying power to the first circuit board, and the other output interface is used for supplying power to the second circuit board;

Thus, two 5V voltage interfaces can supply power to the two circuit boards respectively.

In addition, optionally, with reference to fig. 4, the buck-boost module further includes a power indicator connected to the control switch, and the power indicator is turned on when the control switch is closed. Therefore, the power indicator lamp can indicate the power-on condition of the whole control system.

Additionally, in one implementation, the interface diagram of the client may be as shown in fig. 5. The implementation process in this embodiment may include the following:

firstly, after a user opens a client, the user can click the connection of the equipment at the upper left, and when green pairing occurs, the connection of the equipment of the spreadsheet is successful; and then entering an equipment control step, namely after entering a control interface of the client, a user respectively selects a check box of a certain FFU fan equipment in a region to be controlled, then clicks a gear selection beside the check box of the FFU fan, and selects a gear in which the FFU fan is required to operate at the moment. For example, assuming that the FFU to be controlled is the FFU with the serial number a1 in the a zone and the control gear is 3, the check box below the FFU in the a zone can be clicked to select the a1, and then the gear "3" next to the FFU fan check box is clicked to determine the gear in which the FFU fan is to be operated. Of course, the FFU selection and the shift control process of the FFUs in the B zone, the C zone, and the D zone are the same as the above examples, and are not described again here.

Then, after the device control step is completed, the user may click a state refresh button of the control interface, and the current gear, for example, the current gears of a1 to a4, B1 to B4, C1 to C4, and D1 to D4 in fig. 5, corresponding to the operating state of each FFU fan device at this time may be displayed below the state refresh button.

Of course, if all the FFUs need to be controlled to be closed, a full area closing button in the control interface can be clicked; if the night mode needs to be started, a night mode button in the control interface can be clicked.

In this embodiment, when the client and the control module perform data communication, data is transmitted in bytes, and in order to ensure that the problem that identification information of the FFU and a gear are not matched in the transmission process of the data does not occur, the identification information of the FFU (such as a fan serial number) and a gear control command are simultaneously programmed into the same group of transmission data; in addition, in order to ensure the safety of data, the data is encrypted, and the receiving end needs to perform corresponding decryption processing on each bit of each received byte to obtain the identification information for controlling the corresponding FFU and the specific value of the corresponding gear, so that external personnel can not know the specific control condition of the FFU in the laboratory.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.

Claims

1. A control system for a fan filter unit, comprising:

2. The control system of claim 1, wherein the control module further comprises a number of gear output circuits equal to the number of the FFUs, each gear output circuit is connected to each FFU in a one-to-one correspondence, and each gear output circuit is connected to a corresponding signal output port;

3. The control system of claim 2, wherein each of the gear output circuits is further communicatively connected to the MCU master control circuit;

4. The control system of claim 2, wherein the output extension circuit is connected to all of the gear output circuits by a flat cable.

5. The control system of claim 2,

the MCU master control circuit, the output expansion circuit and the signal transmitting and receiving circuit are arranged on the first circuit board, and the gear output circuit is arranged on the second circuit board.

6. The control system according to any one of claims 1 to 5, further comprising a step-down and voltage-stabilizing module for step-down and voltage-stabilizing a voltage of the external power supply and outputting the step-down and voltage-stabilized voltage to the control module.

7. The control system of claim 6, wherein the voltage reduction and stabilization module comprises a voltage reduction and stabilization circuit and an output interface, the voltage reduction and stabilization circuit is connected with a piezoresistor and a safety circuit which are connected in parallel through a common-mode inductor, the external power supply is connected with a fuse in series, the piezoresistor is connected with the fuse and the external power supply which are connected in series in parallel, and the voltage reduction and stabilization circuit is connected with the control module through the output interface.

8. The control system of claim 7, wherein the number of the output interfaces is two, the step-down voltage stabilizing circuit is connected with the two output interfaces through a control switch, and one of the output interfaces is used for supplying power to a first circuit board, and the other output interface is used for supplying power to a second circuit board;

9. The control system of claim 8, wherein the buck regulator module further comprises a power indicator connected to the control switch, wherein the power indicator is illuminated when the control switch is closed.

10. The control system of claim 1, wherein the output expansion circuit comprises N MCP23017 chips, each MCP23017 chip corresponding to 16 signal output ports, N being a positive integer greater than or equal to 1.