CN212208023U - Control circuit of water quality analyzer - Google Patents

Abstract

The utility model discloses a water quality analyzer's control circuit, including central processing unit, central processing unit's signal input part is connected with PLC signal input circuit, power supply circuit, LED control circuit and division light volume input circuit respectively, and signal output part is connected with analog quantity current output circuit and transistor output circuit respectively. The LED control circuit comprises a communication circuit, a light signal acquisition amplifying circuit and an LED dimming circuit, the communication circuit is connected with the communication interface through a 485 communication module, the light signal acquisition amplifying circuit is connected with a photocell through a photocell amplifier, and the LED dimming circuit is connected with an LED lamp interface. The utility model provides a stable in voltage, signal stability, the fast and low water quality analyzer's of operational failure control circuit of reaction speed, this control circuit has overcome the not enough of prior art, and the project organization is reasonable, has functions such as signal acquisition, signal output, data calculation and state maintenance concurrently simultaneously, and the reliability is high, and sensitivity is high, and application scope is wide.

Description

Control circuit of water quality analyzer

Technical Field

The utility model relates to a water quality analysis technical field, in particular to water quality analyzer's control circuit.

Background

The water environment can not be protected from analyzing and monitoring the water quality, a water quality analyzer is generally required to be arranged at a water quality detection point and used for determining the content of chemical components in water, and the quality of the water quality analyzer plays a crucial role in water environment monitoring. The existing water quality analyzer has large volume and the following defects: 1. voltage conversion is completed through a plurality of diode voltage-stabilizing and coil transformers, and the voltage and signals are unstable, so that the operation failure of the water quality analyzer is high; 2. the temperature signal is generally transmitted from 0P07 to 4-20mA signal, and is converted into digital signal through an AD chip and enters a single chip, and the unstable temperature data can be caused by multiple conversion errors; 3. the brightness of the LED is changed by adjusting the current of the LED through the adjustable resistor, the sensitivity is insufficient, the reaction speed is slow, and the automatic adjustment of the brightness of the LED cannot be realized; 4. the water quality analysis optical signal acquisition amplifying part adjusts the amplification ratio through the adjustable resistance, so that the amplification times are fixed and automatic adjustment cannot be realized; 5. the input and output ports of the central processing unit are few (16 points), a plurality of control points cannot be achieved, and meanwhile, the calculation speed is low, and signals cannot be uploaded to an analyzer in time for use.

Disclosure of Invention

To the above problem, an object of the utility model is to provide a voltage stabilization, signal stability, reaction rate are fast, the high and low water quality analyzer's of operational failure of degree of autocontrol control circuit.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

the control circuit of the water quality analyzer comprises a central processing unit, wherein a signal input end of the central processing unit is respectively connected with a PLC signal input circuit, a power supply circuit, an LED control circuit and a switching light input circuit, and a signal output end of the central processing unit is respectively connected with an analog quantity current output circuit and a transistor output circuit. The LED control circuit comprises a communication circuit, an optical signal acquisition amplifying circuit and an LED dimming circuit. The communication circuit is connected with the communication interface through a 485 communication module, the optical signal acquisition amplifying circuit is connected with a photocell through a photocell amplifier, and the LED dimming circuit is connected with the LED lamp interface.

Furthermore, the LED control circuit also comprises a temperature acquisition circuit, and the temperature acquisition circuit is connected with the temperature sensor through an operational amplifier.

Preferably, the model of the operational amplifier is LF356, and the model of the temperature sensor is PT 100. The LF356 single chip microcomputer can receive signals, so that the intermediate multiple conversion work is omitted, the temperature data is stable, and the reaction speed is high.

Furthermore, the clock circuit comprises a clock and a clock battery for providing power supply for the clock.

Furthermore, the transistor circuit is 32 groups of transistor output circuits, the 32 groups of transistor output circuits are respectively connected with the 16 paths of 3A output circuits, the 16 paths of 0.5A output circuits, the 8 paths of 3A output circuits and the 3 paths of open light input circuits, and the 16 paths of 3A output circuits are connected with the relay output circuit.

Further, the PLC signal input circuit includes a first PLC signal input circuit, a second PLC signal input circuit, a third PLC signal input circuit, a fourth PLC signal input circuit, and a fifth PLC signal input circuit.

Furthermore, the analog quantity current output circuit is a 4-20mA output circuit.

Furthermore, the open light input circuit is an 8-path open light input circuit.

Further, the photovoltaic cell amplifier is AD 8001. The peripheral electronic control circuit of the single chip microcomputer is calculated by the AD8001 and the single chip microcomputer, and the formula is V0 (ISC RC) (1+ Rf/12) [ V ], so that the amplified data of the photocell can be obtained, signals can be stabilized, and the amplification factor can be automatically adjusted through a program.

Further, the model of the central processing unit is STM32F 103. The singlechip of the type overcomes the defects of the existing singlechip, and a plurality of mos tubes are added to be amplified (32 points), and then the output can receive communication signals of a water quality analyzer controller, so that the functions of signal acquisition, signal output, data calculation, state maintenance and the like of the analyzer are completed.

The utility model discloses following beneficial effect has: the control circuit of the water quality analyzer has the following advantages that: 1. the single chip microcomputer of STM32F103 model is adopted to complete the functions of signal acquisition, signal output, data calculation, state maintenance and the like of the analyzer, multiple voltage input can be directly realized, the input and output ports are sufficient, multiple control points can be realized, and the calculation speed is high; 2. in the temperature data signal part, an input PT100 signal is converted into a signal which can be received by the single chip microcomputer through LF356 and then is input into the single chip microcomputer, and the signal which can be received by the single chip microcomputer through LF356 is omitted, so that the temperature data is stable, and the reaction speed is high; 3. the single chip microcomputer controls the duty ratio of the LED through the starting and closing of the peripheral mos tube, and the brightness is adjusted, so that the brightness of the LED can be automatically adjusted to meet the automatic control kinetic energy of the analyzer; 4. the peripheral electronic control circuit of the single chip microcomputer obtains the amplification data of the photocell through AD8001 and single-machine calculation, so that signals can be stabilized, and the amplification factor can be automatically adjusted through a program.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a connection circuit diagram of the cpu.

Fig. 3 is a power supply circuit diagram.

Fig. 4 is a circuit diagram of temperature acquisition.

Fig. 5 is a circuit diagram of LED dimming.

Fig. 6 is a circuit diagram of an optical signal acquisition and amplification circuit.

Description of the main component symbols: 1. a central processing unit; 21. a first PLC signal input circuit; 22. a second PLC signal input circuit; 23. a third PLC signal input circuit; 24. a fourth PLC signal input circuit; 25. a fifth PLC signal input circuit; 3. a power supply circuit; 41. a communication circuit; 411. 485 communication module; 412. a communication interface; 42. an optical signal acquisition amplifying circuit; 421. a photocell amplifier; 422. a photovoltaic cell; 43. an LED dimming circuit; 431. an LED lamp interface; 44. a temperature acquisition circuit; 441. an operational amplifier; 442. a temperature sensor; 5. a light-on amount input circuit; 6. a clock circuit; 61. a clock; 62. a clock battery; 7. an analog quantity current output circuit; 8. a transistor output circuit; 81. a 16-way 3A output circuit; 82. 16 paths of 0.5A output power; 83. an 8-way 3A output circuit; 84. a light-on amount input circuit; 85. and a relay output circuit.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

As shown in fig. 1-6, a control circuit of a water quality analyzer comprises a central processing unit 1, wherein a signal input end of the central processing unit 1 is respectively connected with a PLC signal input circuit, a power supply circuit 3, an LED control circuit, an on-light input circuit 5 and a clock circuit 6, and the model of the central processing unit 1 is STM32F 103. The PLC signal input circuit includes a first PLC signal input circuit 21, a second PLC signal input circuit 22, a third PLC signal input circuit 23, a fourth PLC signal input circuit 24, and a fifth PLC signal input circuit 25. The LED control circuit includes a communication circuit 41, an optical signal collection amplifying circuit 42, an LED dimming circuit 43, and a temperature collection circuit 44. The communication circuit 41 is connected with the communication interface 412 through a 485 communication module 411, the optical signal acquisition and amplification circuit 42 is connected with a photocell 422 through a photocell amplifier 421, and the model of the photocell amplifier 421 is AD 8001. The LED dimming circuit 43 is connected to the LED lamp interface 431, the temperature acquisition circuit 44 is connected to the temperature sensor 442 through an operational amplifier 441, the model of the operational amplifier 441 is LF356, and the model of the temperature sensor 442 is PT 100.

The signal output end of the central processing unit 1 is respectively connected with an analog quantity current output circuit 7 and a transistor output circuit 8. The analog quantity current output circuit 7 is a 4-20mA output circuit, the transistor circuit 8 is a 32-group transistor output circuit, the 32-group transistor output circuit is respectively connected with a 16-channel 3A output circuit 81, a 16-channel 0.5A output circuit 82, an 8-channel 3A output circuit 83 and a 3-channel open light quantity input circuit 84, and the 16-channel 3A output circuit 81 is connected with a relay output circuit 85.

The utility model discloses a theory of operation does: power input of the control circuit: the power supply conversion is carried out when 36V exceeds WRA2412, XL1509 and AMS1117 elements, the converted power supply is +12V, -12V, +5V, -5V, +3.3V and-3.3V to meet the power supply requirement in a board, then the power supply of an LED and a detector is used, the signal supply is stable, noise waves of the signal can be effectively removed, the temperature signal is converted into an analog signal which can be received by a single chip microcomputer through an LP356 chip, unnecessary intermediate conversion links are omitted, and the stability of the temperature signal can be guaranteed. The single chip microcomputer controls the working frequency of the MDS tube through 20 outputs, so that the brightness of the LED is controlled in a communication mode through duty ratio calculation, a signal detection photocell signal is directly input to the single chip microcomputer through an amplification signal of LP356, the amplification proportion is controlled through adjustment of an adjustable resistor, the amplification factor is formed by matching of different adjustable resistors and resistors, the number of the single chip microcomputer signals is from STM32F103VCT6 to 100, the FLASH memory 262144BRAM32768B and the clock frequency 72.0wHz have low power and low voltage, and are combined with real-time functions and the like to achieve multiple control points of water quality analysis, the calculation speed is high, and the signals are in functional requirements of real uploading and the like.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A control circuit of a water quality analyzer is characterized in that: including central processing unit, central processing unit's signal input part is connected with PLC signal input circuit, power supply circuit, LED control circuit and division light input circuit respectively, central processing unit's signal output part is connected with analog quantity current output circuit and transistor output circuit respectively, LED control circuit include communication circuit, light signal acquisition amplifier circuit and LED dimmer circuit, communication circuit pass through 485 communication module and communication interface connection, light signal acquisition amplifier circuit pass through the photocell amplifier and be connected with the photocell, LED dimmer circuit and LED lamp interface connection.

2. The control circuit of a water quality analyzer according to claim 1, characterized in that: the LED control circuit further comprises a temperature acquisition circuit, and the temperature acquisition circuit is connected with the temperature sensor through an operational amplifier.

3. The control circuit of a water quality analyzer according to claim 2, characterized in that: the model of the operational amplifier is LF356, and the model of the temperature sensor is PT 100.

4. The control circuit of a water quality analyzer according to claim 1, characterized in that: the clock circuit comprises a clock and a clock battery for providing power supply for the clock.

5. The control circuit of a water quality analyzer according to claim 1, characterized in that: the transistor output circuit is 32 groups of transistor output circuits, the 32 groups of transistor output circuits are respectively connected with 16 paths of 3A output circuits, 16 paths of 0.5A output circuits, 8 paths of 3A output circuits and 3 paths of open light input circuits, and the 16 paths of 3A output circuits are connected with the relay output circuit.

6. The control circuit of a water quality analyzer according to claim 1, characterized in that: the PLC signal input circuit comprises a first PLC signal input circuit, a second PLC signal input circuit, a third PLC signal input circuit, a fourth PLC signal input circuit and a fifth PLC signal input circuit.

7. The control circuit of a water quality analyzer according to claim 1, characterized in that: the analog quantity current output circuit is a 4-20mA output circuit.

8. The control circuit of a water quality analyzer according to claim 1, characterized in that: the open light input circuit is an 8-path open light input circuit.

9. The control circuit of a water quality analyzer according to claim 1, characterized in that: the photovoltaic cell amplifier is AD8001 in model number.

10. The control circuit of a water quality analyzer according to claim 1, characterized in that: the model of the central processing unit is STM32F 103.

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