CN218938816U - Control circuit for differential pressure controller - Google Patents
Control circuit for differential pressure controller Download PDFInfo
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- CN218938816U CN218938816U CN202223606299.4U CN202223606299U CN218938816U CN 218938816 U CN218938816 U CN 218938816U CN 202223606299 U CN202223606299 U CN 202223606299U CN 218938816 U CN218938816 U CN 218938816U
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Abstract
The utility model discloses a control circuit for a differential pressure controller, which comprises a single chip microcomputer and a differential pressure detection circuit, wherein the differential pressure detection circuit comprises a first operational amplifier and a second operational amplifier, the non-inverting input end of the first operational amplifier is electrically connected with the positive electrode of a pressure sensor, the non-inverting input end of the second operational amplifier is electrically connected with the negative electrode of the pressure sensor, the output end of the first operational amplifier is electrically connected with a first output resistor and then connected with the non-inverting input end of a third operational amplifier, the output end of the second operational amplifier is electrically connected with a second output resistor and then connected with the inverting input end of the third operational amplifier, and the output end of the third operational amplifier is connected with the pressure sampling end of the single chip microcomputer. The utility model detects the pressure difference between the inner surface and the outer surface of the dust removing cloth bag in real time through the pressure sensor, so as to conveniently clean the dust removing cloth bag.
Description
Technical Field
The utility model relates to the field of dust removal, in particular to a control circuit for a differential pressure controller.
Background
The environment-friendly dust removal controller is used for controlling various dust removal devices to execute dust removal instructions in a factory workshop for generating dust, completing dust removal flow, ensuring that the dust concentration in a working environment is lower than a safety standard and meeting the environment-friendly requirement.
The off-line environment-friendly dust removal controller is mainly applied to off-line dust removal of a bag-type dust remover, wherein off-line dust removal of the bag-type dust remover means that dust removal is not carried out when dust-containing gas is filtered by a bag, and the dust removal is carried out when the dust-containing gas is stopped from being filtered by the surface of the bag. When the pressure difference between the inner surface and the outer surface of the cloth bag is large, the dust accumulated by the cloth bag is more, and the cloth bag needs to be cleaned. The pressure difference controller can detect the pressure difference between the inner surface and the outer surface of the cloth bag, and can control the ash removal of the cloth bag according to the detected pressure difference, and a control circuit for the pressure difference controller needs to be designed aiming at the pressure difference controller.
Disclosure of Invention
The utility model mainly solves the technical problem of providing a control circuit for a differential pressure controller, solving the problem that the control circuit for the differential pressure controller is lacking in the prior art, and realizing the pressure detection of a dust collection cloth bag.
In order to solve the technical problems, the utility model provides a control circuit for a differential pressure controller, which comprises a single chip microcomputer and a differential pressure detection circuit, wherein the differential pressure detection circuit comprises a first operational amplifier and a second operational amplifier, the in-phase input end of the first operational amplifier is electrically connected with the positive electrode of a pressure sensor, the in-phase input end of the second operational amplifier is electrically connected with the negative electrode of the pressure sensor, the output end of the first operational amplifier is electrically connected with a first output resistor and then connected with the in-phase input end of a third operational amplifier, the output end of the second operational amplifier is electrically connected with a second output resistor and then connected with the reverse input end of the third operational amplifier, and the output end of the third operational amplifier is connected with the pressure sampling end of the single chip microcomputer.
Preferably, the pulse valve control circuit further comprises a pulse valve control circuit, wherein the pulse valve control circuit comprises a pulse control triode, the base electrode of the pulse control triode is electrically connected with the pulse valve control end of the singlechip, the collector electrode of the pulse control triode is electrically connected with the cathode of the pulse valve, the anode of the pulse valve is electrically connected with a first direct current power supply, and the emitter of the pulse control triode is grounded.
Preferably, the control end of the pulse valve of the singlechip is also electrically connected with a current limiting resistor and then connected with the positive electrode of the pulse valve work indication diode, and the negative electrode of the pulse valve work indication diode is grounded.
Preferably, the display circuit further comprises a display circuit, wherein the display circuit comprises a chip TM1638 and a digital display tube, the chip TM1638 is electrically connected with the single chip, and the chip TM1638 is electrically connected with the digital display tube.
Preferably, the alarm circuit further comprises an alarm circuit, the positive electrode of the alarm circuit comprises a buzzer, the positive electrode of the buzzer is electrically connected with a first direct current power supply, the negative electrode of the buzzer is electrically connected with the collector electrode of an alarm control triode, the base electrode of the alarm control triode is electrically connected with the first alarm voltage dividing resistor and then is electrically connected with the alarm control end of the singlechip, and the base electrode of the alarm control triode is electrically connected with the second alarm voltage dividing resistor and then is grounded.
Preferably, the device further comprises a data transmission circuit, wherein the data transmission circuit comprises a chip SP485 and a 485 interface, the positive signal input end of the chip SP485 is electrically connected with the positive signal end of the 485 interface, and the negative signal input end is electrically connected with the negative signal end of the 485 interface; the serial port transmitting end of the chip SP485 is electrically connected with the first serial port receiving end of the single chip microcomputer, and the serial port receiving end of the chip SP485 is electrically connected with the first serial port transmitting end of the single chip microcomputer.
Preferably, the singlechip is further connected with the remote control terminal through an internet of things module, the internet of things module comprises chips AI R720UG and an SI M card, the chips AI R720UG and the SI M card are electrically connected, and the singlechip is connected with an asynchronous serial port between the chips AI R720 UG.
Preferably, the power supply circuit further comprises a first-order power supply circuit for converting alternating current into direct current and a second-order power supply circuit for reducing direct current voltage.
Preferably, the first-order power supply circuit comprises a switch power supply module, wherein an input end of the switch power supply module is electrically connected with a wiring end of the common mode inductor and then is connected with a live wire of alternating current, a grounding end of the switch power supply module is electrically connected with a zero line of the alternating current after being connected with the other wiring end of the common mode inductor, and an output end of the switch power supply module outputs a first direct current power supply.
Preferably, the second-order power supply circuit comprises a chip LM2596, wherein the input end of the chip LM2596 is connected with the first direct current power supply, the output end of the chip LM2596 outputs the second direct current power supply, the second-order power supply circuit further comprises a chip AMS1117-3.3, the input end of the AMS1117-3.3 is electrically connected with the output end of the chip LM2596, and the output end of the AMS1117-3.3 outputs the third direct current power supply.
The beneficial effects of the utility model are as follows: the utility model discloses a control circuit for a differential pressure controller, which comprises a single chip microcomputer and a differential pressure detection circuit, wherein the differential pressure detection circuit comprises a first operational amplifier and a second operational amplifier, the non-inverting input end of the first operational amplifier is electrically connected with the positive electrode of a pressure sensor, the non-inverting input end of the second operational amplifier is electrically connected with the negative electrode of the pressure sensor, the output end of the first operational amplifier is electrically connected with a first output resistor and then connected with the non-inverting input end of a third operational amplifier, the output end of the second operational amplifier is electrically connected with a second output resistor and then connected with the inverting input end of the third operational amplifier, and the output end of the third operational amplifier is connected with the pressure sampling end of the single chip microcomputer. The utility model detects the pressure difference between the inner surface and the outer surface of the dust removing cloth bag in real time through the pressure sensor, so as to conveniently clean the dust removing cloth bag.
Drawings
FIG. 1 is a schematic diagram of a differential pressure detection circuit in a control circuit for a differential pressure controller according to the present utility model;
FIG. 2 is a schematic diagram of a single-chip microcomputer in a control circuit for a differential pressure controller according to the present utility model;
FIG. 3 is a schematic diagram of a pulse valve control circuit in a control circuit for a pressure differential controller according to the present utility model;
FIG. 4 is a chip TM1638 of a display circuit in a control circuit for a differential pressure controller according to the present utility model;
FIG. 5 is a digital display tube of a display circuit in a control circuit for a pressure differential controller according to the present utility model;
FIG. 6 is another digital display tube of a display circuit in a control circuit for a pressure differential controller according to the present utility model;
FIG. 7 is a schematic diagram of an alarm circuit in a control circuit for a pressure differential controller in accordance with the present utility model;
FIG. 8 is a schematic diagram of a data transmission circuit in a control circuit for a pressure differential controller in accordance with the present utility model;
FIG. 9 is a schematic diagram of a chip AI R720UG in a control circuit for a differential pressure controller in accordance with the utility model;
FIG. 10 is a schematic diagram of an SI M card seat in a control circuit for a differential pressure controller according to the present utility model;
FIG. 11 is a schematic diagram of a first order power supply circuit in a control circuit for a pressure differential controller in accordance with the present utility model;
fig. 12 is a schematic diagram of a second order power supply circuit in a control circuit for a pressure differential controller according to the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 and 2, the control circuit for the differential pressure controller comprises a singlechip and a differential pressure detection circuit, wherein the differential pressure detection circuit is electrically connected with a pressure sensor through an interface J1, and the pressure sensor is used for detecting the pressure between the inner surface and the outer surface of the dust collection cloth bag. The differential pressure detection circuit comprises a first operational amplifier (U6A) and a second operational amplifier (U6B), wherein the non-inverting input end of the first operational amplifier (U6A) is electrically connected with the positive electrode (the third core of the interface J1) of the pressure sensor, and the inverting input end of the first operational amplifier (U6A) is electrically connected with the first impedance resistor R83 and then connected with the output end of the first operational amplifier (U6A); the non-inverting input end of the second operational amplifier (U6B) is electrically connected with the negative electrode (the fourth core of the interface J1) of the pressure sensor, the first core of the interface J1 is electrically connected with the second direct current power supply +5V, and the second core of the interface J1 is grounded; the inverting input end of the second operational amplifier (U6B) is electrically connected with the second impedance resistor R75 and then connected with the output end of the second operational amplifier (U6B);
the output end of the first operational amplifier (U6A) is electrically connected with a first output resistor R80 and then connected to the non-inverting input end of the third operational amplifier (U9B), and the non-inverting input end of the third operational amplifier (U9B) is also electrically connected with a third impedance resistor R74 and then grounded; the output end of the second operational amplifier (U6B) is electrically connected with the second output resistor R76 and then connected to the inverting input end of the third operational amplifier (U9B), the inverting input end of the third operational amplifier (U9B) is electrically connected with the fourth impedance resistor R81 and then connected to the output end of the third operational amplifier (U9B), the output end of the third operational amplifier (U9B) is connected to the pressure sampling end PC4 of the singlechip in FIG. 2, and the pressure sampling end PC4 can detect the pressure difference between the inner surface and the outer surface of the dust collection cloth bag through a pressure sensor in real time.
Preferably, a fifth impedance resistor R77 is further connected between the inverting input terminal of the first operational amplifier (U6A) and the inverting input terminal of the second operational amplifier (U6B). The first operational amplifier (U6A), the second operational amplifier (U6B) and the third operational amplifier (U9B) are all powered by the second direct current power supply +5V.
Further, as shown in fig. 2, the single chip microcomputer is a chip STM32F103C8T6, a power supply terminal Vdd of the chip STM32F103C8T6 is electrically connected to a third dc power supply +3.3v, vss is grounded, and a crystal oscillator pin osc_out and osc_ I N of the chip STM32F103C8T6 are connected to the crystal oscillator and then grounded, and a pin BOOT of the chip STM32F103C8T6 is electrically connected to a resistor R61 and then grounded.
Further, as shown in fig. 3, the control circuit for the differential pressure controller further comprises a pulse valve control circuit, the pulse valve control circuit is electrically connected with the pulse valve through an interface J2, and after the pulse valve is opened, the ash removal system carries out reverse blowing on the dust removal cloth bag to clean dust of the dust removal cloth bag. The pulse valve control circuit comprises a pulse control triode Q7, wherein the base electrode of the pulse control triode Q7 is electrically connected with a pulse valve control end PC3 of the singlechip in the figure 2, specifically, the base electrode of the pulse control triode Q7 is electrically connected with a first pulse control resistor R2 and then connected with the pulse valve control end PC3 of the singlechip in the figure 2, the base electrode of the pulse control triode Q7 is also electrically connected with a second pulse control resistor R3 and then grounded, the collector electrode of the pulse control triode Q7 is electrically connected with the negative electrode (the second core of the interface J1) of the pulse valve, the positive electrode (the first core of the interface J1) of the pulse valve is electrically connected with a first direct current power supply +24V, and the emitter electrode of the pulse control triode Q7 is grounded. When the pulse valve control end PC3 of the singlechip in FIG. 2 drives the pulse control triode Q7 to be conducted, the pulse valve is opened, and the ash removal system carries out reverse blowing on the dust removal cloth bag. The condition of opening the pulse valve can be automatically opening when the pressure difference between the inner surface and the outer surface of the dust collection cloth bag detected by the pressure sensor is overlarge, or can be opening at fixed time by setting the pulse valve.
Preferably, the pulse valve control end PC3 of the singlechip in fig. 2 is further electrically connected to the current limiting resistor R1 and then connected to the positive electrode of the pulse valve operation indicating diode D11, and the negative electrode of the pulse valve operation indicating diode D11 is grounded. When the pulse valve is opened, the pulse valve operation indication diode D11 emits light to indicate.
Further, as shown in fig. 4 to 6, the control circuit for the differential pressure controller further includes a display circuit for displaying the pressure difference detected by the pressure sensor. The differential pressure display circuit comprises a chip TM1638 and a digital display tube, wherein the chip TM1638 is electrically connected with the single chip, and the chip TM1638 is also electrically connected with the digital display tube.
The chip select end STB of the chip TM1638 is connected with the chip select end PC10 of the singlechip in FIG. 2, and is further connected with the chip select current limiting resistor R8 and then connected with a third direct current power supply +3.3V, the clock end CLK is electrically connected with the clock signal output end PC9 of the singlechip, and is further connected with the pull-up resistor R10 and then connected with the third direct current power supply +3.3V, the data end DIO is connected with an input and output end PC12 of the singlechip, and is further electrically connected with the pull-up resistor R11 and then connected with the third direct current power supply +3.3V. The power supply end is electrically connected with the second direct current power supply +5V, the power supply end is electrically connected with the positive electrode of the polar capacitor C2, the negative electrode of the polar capacitor C2 is grounded, the preferable power supply end is also electrically connected with the positive electrode of the polar capacitor C1, and the negative electrode of the polar capacitor C1 is grounded.
As shown in fig. 5 and 6, the digital display tube includes a first digital display tube and a second digital display tube, which are both 3-bit common-positive digital tubes, fig. 11 is a first digital display tube, and fig. 12 is a second digital display tube. The common anode of each digital display tube is respectively connected to one output bit of the chip TM1638 in fig. 10, that is, the common anode (a-DP) of each digital display tube is respectively connected to the output bits (GR 1-GR 8) of the chip TM1638 in a one-to-one correspondence manner, the free end of the common anode a in fig. 6 and fig. 7 is marked with characters of LEDA, and the free end of the output bit GR1 of the chip TM1638 is also marked with characters of LEDA, which means that the chips are mutually connected, and the other chips are similar and will not be repeated here.
In FIG. 5, the three bit selections (DI G1-DI G3) of the first digital display tube are correspondingly connected to the first output segment to the third output segment (SEG 1/K1-SEG 3/K3) of the chip TM1638 in FIG. 4, and the three bit selections (DI G1-DI G3) of the second digital display tube are correspondingly connected to the fourth output segment to the sixth output segment (SEG 4/K4-SEG 6/K6) of the chip TM1638 in FIG. 6. The ground of chip TM1638 is grounded.
Further, as shown in fig. 7, the control circuit for the differential pressure controller further includes an alarm circuit, the alarm circuit includes a buzzer B1, the positive electrode of the buzzer B1 is electrically connected with a first direct current power supply +24v, and a resistor R23 is further connected in series between the positive electrode of the buzzer B1 and the first direct current power supply +24v; the negative electrode of the buzzer B1 is electrically connected with the collector electrode of the alarm control triode Q5, the base electrode of the alarm control triode Q5 is electrically connected with the first alarm voltage dividing resistor R27 and then is electrically connected with the alarm control end PA6 of the singlechip in FIG. 2, and the base electrode of the alarm control triode Q5 is also electrically connected with the second alarm voltage dividing resistor R34 and then is grounded. When the pressure value detected by the pressure sensor exceeds the set range, the singlechip controls the alarm control triode Q5 to be conducted, and the buzzer B1 starts alarm prompt.
Preferably, an alarm protection diode D5 is also connected between the positive pole and the negative pole of the buzzer B1.
Further, as shown in fig. 8, the control circuit for the differential pressure controller further includes a data transmission circuit, through which data of the differential pressure controller can be transmitted to an upper computer or a PLC system. The data transmission circuit comprises chips SP485 and 485 interfaces, and is electrically connected with an upper computer or a PLC system through the 485 interfaces; the positive electrode signal input end (485+) of the chip SP485 is electrically connected with the positive electrode signal end (1-485+) of the 485 interface, and the negative electrode signal input end (485-) is electrically connected with the negative electrode signal end (1-485-); the serial port transmitting end TX of the chip SP485 is electrically connected with the first serial port receiving end PA2 of the single chip microcomputer in FIG. 2, and the serial port receiving end RX of the chip SP485 is electrically connected with the first serial port transmitting end PA3 of the single chip microcomputer in FIG. 2.
Preferably, the positive signal end (1-485+) of the 485 interface is electrically connected with the resistor R52 and then is connected with the positive signal input end (485+) of the chip SP485, and is also electrically connected with the protection diode D3 and then is grounded. The positive electrode signal input end (485+) of the chip SP485 is also electrically connected with the pull-up resistor R51 and then connected with a second direct current power supply +5V.
The negative electrode signal end (1-485-) of the 485 interface is electrically connected with a resistor R54 and a resistor R53 which are sequentially connected in series and then is connected with the negative electrode signal input end (485-) of the chip SP485, and the negative electrode signal end (1-485-) of the 485 interface is also electrically connected with a protection diode D2 and then is grounded; the negative signal input end (485-) of the chip SP485 is also electrically connected with the resistor R50 and then grounded.
The power end VCC of the chip SP485 is electrically connected with a second direct current power supply +5V, the driving output enabling anode RE+ and the driving output enabling cathode RE-are directly electrically connected, and the driving output enabling cathode RE-is electrically connected with a resistor R47 and then grounded.
Further, as shown in fig. 9 and 10, the singlechip is further connected with the remote control terminal through the internet of things module, and transmits various parameter states of the differential pressure controller to the remote control terminal, so that unified management of the remote control terminal is facilitated.
The internet of things module comprises chips AI R720UG and an SiM card, the chips AI R720UG and the SiM card are electrically connected, the SiM card is arranged on an SiM card seat, and the singlechip is connected with an asynchronous serial port between the chips AI R720 UG.
Specifically, in fig. 9, the serial port transmitting end hum_dp1 of the chip AI R720UG is electrically connected to the resistor R0329 and then connected to the third serial port receiving end PC6 in fig. 2, and the serial port receiving end hum_dm1 of the chip AI R720UG is electrically connected to the resistor R0330 and then connected to the third serial port transmitting end PC7 in fig. 2; the antenna end of the chip AI R720UG is electrically connected with an antenna ANT; the power end of the chip AI R720UG is electrically connected with a fourth direct current power supply +4.2V, and the fourth direct current power supply +4.2V can be generated by the second direct current power supply +5 after voltage division; the power supply terminal sim_vdd of the chip AI R720UG is electrically connected to the power supply terminal VCC of the sm socket in fig. 11, the data terminal sim_dat of the chip AI R720UG is electrically connected to the data terminal I/O of the sm socket in fig. 11, the clock terminal sim_clk of the chip AI R720UG is electrically connected to the clock terminal CLK of the sm socket in fig. 11, and the restart control terminal sim_rst of the chip AI R720UG is electrically connected to the restart terminal RST of the sm socket in fig. 11; the sm pad is also electrically connected to the chip SMF 05C.
Further, as shown in fig. 11 and 12, the control circuit for the differential pressure controller further includes a power supply circuit including a first-order power supply circuit that converts alternating current into direct current, and a second-order power supply circuit that steps down direct current voltage.
As shown in fig. 11, the first-order power supply circuit includes a switching power supply module U3, an input end I N of the switching power supply module U3 is electrically connected to a live wire L of the common-mode inductor L6 and then connected to an alternating current, and a ground end of the switching power supply module U3 is electrically connected to a neutral wire N of the alternating current after being connected to another terminal of the common-mode inductor L6. Specifically, an input end I N of the switching power supply module U3 is connected to a fourth terminal of the common-mode inductor L6, a first terminal of the common-mode inductor L6 is connected to a fuse FU1 and then is connected to a live wire L of alternating current, a ground end GND of the switching power supply module U3 is connected to a third terminal of the common-mode inductor L6, a second terminal of the common-mode inductor L6 is connected to a thermistor NTC1, the other end of the thermistor NTC1 is connected to a zero line N of alternating current, a protection resistor FU1 is also connected to one end of a varistor FU2, and the other end of the varistor FU2 is connected to the thermistor NTC1; the thermistor NTC1, the piezoresistor FU2 and the fuse FU1 play a role in protecting the first-order power supply circuit.
The output terminal OUT of the switching power supply module U3 outputs the first direct current power +24v.
Preferably, a capacitor C19 is further connected between the first terminal and the second terminal of the common-mode inductor L6, a capacitor C20 is further connected between the third terminal and the fourth terminal of the common-mode inductor L6, the alternating current is decoupled through the fuse FU1 and the capacitors (C19 and C20), and the common-mode inductor L6 is connected to the switching power supply module U3 after being filtered.
As shown in fig. 12, the second-order power supply circuit includes a chip LM2596, an input terminal Vi n of the chip LM2596 is connected to a first dc power supply +24v, and an output terminal Vout outputs a second dc power supply +5v; the power supply circuit also comprises a chip AMS1117-3.3, wherein a power supply input end I N of the chip AMS1117-3.3 is electrically connected with an output end Vout of a chip LM2596, and an output end OUT of a power supply of the chip AMS1117-3.3 outputs a third direct current power supply +3.3V.
Specifically, the input terminal Vi n of the chip LM2596 is connected to +24v dc voltage, the output terminal Vout is connected to the cathode of a schottky diode D1, the anode of the schottky diode D1 is grounded, the output terminal Vout is also connected to an inductor L7, the other end of the inductor L7 is connected to the positive electrode of the first polarity capacitor C27, the negative electrode of the first polarity capacitor C27 is grounded, the positive electrode of the first polarity capacitor C27 outputs a second dc power +5v for supplying power to the weighing conversion circuit, the positive electrode of the first polarity capacitor C27 is also electrically connected to the feedback terminal FBack of the chip LM2596, the switch terminal on/off of the chip LM2596 is grounded, and the other pin terminals of the chip LM2596 are grounded. Preferably, the positive electrode of the first polarity capacitor C27 is further connected to the capacitors C25, C28, and C26, respectively, and then grounded.
The positive electrode of the first polarity capacitor C27 is also connected to the input end of the chip AMS1117-3.3, the output end of the chip AMS1117-3.3 outputs a third direct current power supply +3.3V for supplying power to the singlechip, and the grounding end of the chip AMS1117-3.3 is grounded. Preferably, the output end of the chip AMS1117-3.3 is also electrically connected to the capacitor C21 and the capacitor C22 respectively and then grounded.
The utility model discloses a control circuit for a differential pressure controller, which comprises a single chip microcomputer and a differential pressure detection circuit, wherein the differential pressure detection circuit comprises a first operational amplifier and a second operational amplifier, the non-inverting input end of the first operational amplifier is electrically connected with the positive electrode of a pressure sensor, the non-inverting input end of the second operational amplifier is electrically connected with the negative electrode of the pressure sensor, the output end of the first operational amplifier is electrically connected with a first output resistor and then connected with the non-inverting input end of a third operational amplifier, the output end of the second operational amplifier is electrically connected with a second output resistor and then connected with the inverting input end of the third operational amplifier, and the output end of the third operational amplifier is connected with the pressure sampling end of the single chip microcomputer. The utility model detects the pressure difference between the inner surface and the outer surface of the dust removing cloth bag in real time through the pressure sensor, so as to conveniently clean the dust removing cloth bag.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.
Claims (10)
1. A control circuit for a pressure differential controller, characterized by: the differential pressure detection circuit comprises a first operational amplifier and a second operational amplifier, wherein the non-inverting input end of the first operational amplifier is electrically connected with the positive electrode of the pressure sensor, the non-inverting input end of the second operational amplifier is electrically connected with the negative electrode of the pressure sensor, the output end of the first operational amplifier is electrically connected with a first output resistor and then connected with the non-inverting input end of a third operational amplifier, the output end of the second operational amplifier is electrically connected with a second output resistor and then connected with the inverting input end of the third operational amplifier, and the output end of the third operational amplifier is connected with the pressure sampling end of the single chip microcomputer.
2. The control circuit for a differential pressure controller as claimed in claim 1, wherein: the pulse valve control circuit comprises a pulse control triode, the base electrode of the pulse control triode is electrically connected with the pulse valve control end of the singlechip, the collector electrode of the pulse control triode is electrically connected with the cathode of the pulse valve, the anode of the pulse valve is electrically connected with a first direct current power supply, and the emitter electrode of the pulse control triode is grounded.
3. The control circuit for a differential pressure controller as claimed in claim 2, wherein: the control end of the pulse valve of the singlechip is also electrically connected with the current limiting resistor and then connected with the positive electrode of the pulse valve work indication diode, and the negative electrode of the pulse valve work indication diode is grounded.
4. The control circuit for a differential pressure controller as claimed in claim 1, wherein: the display circuit comprises a chip TM1638 and a digital display tube, wherein the chip TM1638 is electrically connected with the single chip microcomputer, and the chip TM1638 is electrically connected with the digital display tube.
5. The control circuit for a differential pressure controller as claimed in claim 1, wherein: the alarm circuit comprises a buzzer, the positive electrode of the buzzer is electrically connected with a first direct current power supply, the negative electrode of the buzzer is electrically connected with the collector electrode of an alarm control triode, the base electrode of the alarm control triode is electrically connected with the first alarm voltage dividing resistor and then is electrically connected with the alarm control end of the singlechip, and the base electrode of the alarm control triode is electrically connected with the second alarm voltage dividing resistor and then is grounded.
6. The control circuit for a differential pressure controller as claimed in claim 1, wherein: the data transmission circuit comprises a chip SP485 and a 485 interface, wherein the positive signal input end of the chip SP485 is electrically connected with the positive signal end of the 485 interface, and the negative signal input end is electrically connected with the negative signal end of the 485 interface; the serial port transmitting end of the chip SP485 is electrically connected with the first serial port receiving end of the single chip microcomputer, and the serial port receiving end of the chip SP485 is electrically connected with the first serial port transmitting end of the single chip microcomputer.
7. The control circuit for a differential pressure controller as claimed in claim 1, wherein: the singlechip is also connected with the remote control terminal through an Internet of things module, the Internet of things module comprises a chip AIR720UG and a SIM card, the chip AIR720UG is electrically connected with the SIM card, and the singlechip is connected with an asynchronous serial port between the chip AIR720 UG.
8. The control circuit for a differential pressure controller as claimed in claim 1, wherein: the power supply circuit comprises a first-order power supply circuit for converting alternating current into direct current and a second-order power supply circuit for reducing direct current voltage.
9. The control circuit for a pressure differential controller as set forth in claim 8, wherein: the first-order power supply circuit comprises a switch power supply module, wherein the input end of the switch power supply module is electrically connected with a wiring end of the common mode inductor and then is connected with a live wire of alternating current, the grounding end of the switch power supply module is electrically connected with a zero line of the alternating current after being connected with the other wiring end of the common mode inductor, and the output end of the switch power supply module outputs a first direct current power supply.
10. The control circuit for a pressure differential controller as claimed in claim 9, wherein: the second-order power supply circuit comprises a chip LM2596, wherein the input end of the chip LM2596 is connected with the first direct current power supply, the output end of the chip LM2596 outputs the second direct current power supply, the second-order power supply circuit further comprises a chip AMS1117-3.3, the input end of the AMS1117-3.3 is electrically connected with the output end of the chip LM2596, and the output end of the AMS1117-3.3 outputs the third direct current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223606299.4U CN218938816U (en) | 2022-12-30 | 2022-12-30 | Control circuit for differential pressure controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223606299.4U CN218938816U (en) | 2022-12-30 | 2022-12-30 | Control circuit for differential pressure controller |
Publications (1)
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| CN218938816U true CN218938816U (en) | 2023-04-28 |
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| CN202223606299.4U Active CN218938816U (en) | 2022-12-30 | 2022-12-30 | Control circuit for differential pressure controller |
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