CN203465551U - Circuit for seawater desalination system - Google Patents

Abstract

The utility model discloses a circuit used in a seawater desalination system. The utility model comprises a basic circuit of an STC12C5628AD chip, a 12-5V voltage conversion circuit, a liquid level measurement circuit, a PWM control circuit, a motor control circuit and a temperature detection circuit. It specifically includes voltage regulator block U1, microcontroller chip U2, chip U3, interface J1~interface J5, resistor R1~resistor R9, capacitor C1~capacitor C13, crystal oscillator Y1, field effect transistor Q1~Q2, rectifier diode D1~D2 and inductor L1 . The utility model can receive multiple liquid level signals transmitted to the single chip microcomputer, and monitor multiple liquid levels at the same time; the PWM control circuit in the utility model uses the field effect tube Q1 to control the on-off of the circuit of the interface J2, and realizes the control of the large current with a small current effect.

Description

A circuit for seawater desalination system

technical field

The utility model belongs to the technical field of semiconductor refrigeration chip control, and relates to a circuit used in a seawater desalination system.

Background technique

Seawater desalination is the use of seawater desalination to produce fresh water. It is an open-source incremental technology to realize the utilization of water resources. It can increase the total amount of fresh water without being affected by time, space and climate. The water quality is good and the price is becoming more and more reasonable. It can ensure stable water supply such as drinking water for coastal residents and supplementary water for industrial boilers. The process of obtaining fresh water from sea water is called desalination. Currently used seawater desalination methods include seawater freezing method, electrodialysis method, distillation method, and reverse osmosis method, but the control circuit in the seawater desalination process is relatively cumbersome, and some seawater desalination methods do not have control circuits, making the entire seawater desalination process difficult. cumbersome.

In the process of desalination of seawater by using the semiconductor refrigerating sheet, the utility model needs to precisely control the motor, the semiconductor refrigerating sheet, and the solenoid valve, and accurately measure the temperature, liquid level, and air pressure, so that the working state of the entire system can be clearly known , to facilitate manual operation of the corresponding modules in case of failure. The control circuit is accurate, simple, low in cost, quick in response, strong in anti-interference ability, and fully meets the system control requirements.

Contents of the invention

The purpose of the utility model is to provide a circuit for seawater desalination system aiming at the disadvantages of complex, cumbersome and slow response in the prior art.

The utility model comprises a basic circuit of an STC12C5628AD chip, a 12-5V voltage conversion circuit, a liquid level measurement circuit, a PWM control circuit, a motor control circuit and a temperature detection circuit.

The basic circuit of the STC12C5628AD chip includes a single-chip microcomputer chip U2, the first resistor R1, the third voltage dividing resistor R3, the fourth voltage dividing resistor R4, the fifth resistor R5, the ninth electrolytic capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 , the twelfth capacitor C12, the thirteenth capacitor C13, the first light-emitting diode DS1, the second light-emitting diode DS2, the first switch S1, the crystal oscillator Y1; one end of the fifth resistor R5 is connected to the ground, and the other end is connected to the ninth electrolytic The negative end of the capacitor C9 is connected to the third pin of the single-chip microcomputer chip U2, and the positive end of the ninth electrolytic capacitor C9 is connected to the high level; one end of the third voltage dividing resistor R3 is connected to the high level, and the other end is connected to the high level. The anode of the first light-emitting diode DS1 is connected, the cathode of the first light-emitting diode DS1 is connected to the second pin of the single-chip microcomputer chip U2; one end of the fourth voltage dividing resistor R4 is connected to the high level, and the other end is connected to the second light-emitting diode. The anode of the diode DS2 is connected, the cathode of the second light-emitting diode DS2 is connected to the first pin of the single-chip microcomputer chip U2; one end of the first switch S1 is grounded, and at the same time connected to one end of the tenth capacitor C10; the first switch S1 The other end is connected to one end of the first resistor R1, the other end of the tenth capacitor C10, and the ground 27 pin of the single-chip microcomputer chip U2; the other end of the first resistor R1 is connected to the high level; one end of the eleventh capacitor C11 It is connected with the 28th pin of high level and single-chip microcomputer chip U2; the other end of the eleventh capacitor C11 is connected with the ground; one end of the twelfth capacitor C12 is connected with the ground; the other end of the twelfth capacitor C12 is connected with the ground. One end of the first crystal oscillator Y1 is connected to the sixth pin of the single-chip microcomputer chip U2; one end of the thirteenth capacitor C13 is connected to the ground; the other end of the thirteenth capacitor C13 is connected to the other end of the first crystal oscillator Y1 and the single-chip microcomputer chip U2 The 7th pin is connected.

The 12-5V voltage conversion circuit includes a third electrolytic capacitor C3, a fourth capacitor C4, a voltage stabilizing block U1, a fifth electrolytic capacitor C5, and a sixth capacitor C6. The positive pole of the third electrolytic capacitor C3 is connected to the positive +12V power supply, one end of the fourth capacitor C4, and Vin of the voltage stabilizing block U1; the other end of the third electrolytic capacitor C3 is connected to the other end of the fourth capacitor C4, and the voltage stabilizing block U1. The GND pin, the negative pole of the fifth electrolytic capacitor C5, and one end of the sixth capacitor C6 are connected and grounded at the same time; the positive pole of the fifth electrolytic capacitor C5 is connected to the Vout pin of the voltage stabilizing block U1, the other end of the sixth capacitor C6, VCC connect.

The liquid level measurement circuit includes a chip U3, a second capacitor C2, an eighth resistor R8, an interface J5, an interface J1, and a ninth resistor R9. The first pin of the chip U3 is connected to the ninth pin of the single-chip microcomputer chip U2; the second pin of the chip U3 is connected to the tenth pin of the single-chip microcomputer chip U2; the seventh pin of U3 is connected to the first pin of the single-chip microcomputer chip U2 The 13 pins are connected; the 16th pin of the chip U3 is connected to one end of the second capacitor C2 at a high level; the other end of the second capacitor C2 is connected to the 15th pin of the chip U3 at a low level; One end of the eighth resistor R8 is connected to the high-level VCC; the other end of the eighth resistor R8 is connected to the 14th pin of the chip U3 and the first pin of the interface J5; the second pin of the interface J5 is connected to the low-level One end of the ninth resistor R9 is connected to the high-level VCC; the other end of the ninth resistor R9 is connected to the thirteenth pin of the chip U3 and the first pin of the interface J1; the second pin of the interface J1 The pin is connected with the low level; the 8th pin and the 10th pin of the chip U3 are connected with the low level.

The PWM control circuit includes a second resistor R2, a first field effect transistor Q1, a first rectifier diode D1, a first inductor L1, a seventh electrolytic capacitor C7, an eighth capacitor C8, and an interface J2. One end of the second resistor R2 is connected to the seventeenth pin of the microcontroller U2 and the gate of the first field effect transistor Q1; the other end of the second resistor R2 is connected to the low level; the source of the first field effect transistor Q1 The pole is connected to the low level; the drain of the first field effect transistor Q1 is connected to the positive pole of the first rectifier tube D1, the negative pole of the seventh electrolytic capacitor C7, one end of the eighth capacitor C8, and the second pin of the interface J2 The negative pole of the first rectifier diode D1 is connected to one end of the first inductor L1 and the +12V power supply; the other end of the first inductor L1 is connected to the positive pole of the seventh electrolytic capacitor C7, the other end of the eighth capacitor C8, and the first terminal of the interface J2 One pin connected.

The motor control circuit includes a sixth resistor R6, a second field effect transistor Q2, a second rectifier diode D2, and an interface J3. One end of the sixth resistor is connected to the 25 pin of the single-chip microcomputer chip U2 and the gate of the second field effect transistor Q2; the other end of the sixth resistor R6 is connected to the low level; the source of the second field effect transistor Q2 is connected to The low level is connected; the drain of the second field effect transistor Q2 is connected with the anode of the second rectifier diode D2 and the second pin of the interface J3; the cathode of the second rectifier diode D2 is connected with the first pin of the interface J3, +12V power supply connected;

The temperature detection circuit includes an interface J4, a seventh resistor R7, and a first capacitor C1. The first pin of the interface J4 is connected to the low level; the second pin of the interface J4 is connected to one end of the seventh resistor R7 and the eighteenth pin of the single-chip microcomputer chip U2; the third pin of the interface J4 is connected to the first One end of a capacitor C1 and the other end of the seventh resistor R7 are connected to a high level; the other end of the first capacitor C1 is connected to a low level.

The beneficial effects of the utility model are as follows:

The single-chip microcomputer chip STC12C5628AD used in the utility model has 8 channels of 10-bit high-speed A/D converters, and the speed can reach 100KHz, which ensures the precision and accuracy of sampling. The liquid level measuring circuit in the utility model utilizes the parallel port to serial port chip 74HC165 to receive multiple liquid level signals and transmit them to the single-chip microcomputer, and monitor multiple liquid levels at the same time; the PWM control circuit in the utility model utilizes the field effect tube Q1 to control the circuit of the interface J2 On and off, realize the function of controlling large current with small current.

Description of drawings

Fig. 1 is the basic circuit diagram of the STC12C5628AD chip in the utility model;

Fig. 2 is the 12-5v voltage conversion circuit schematic diagram in the utility model;

Fig. 3 is a schematic diagram of the liquid level measurement circuit in the utility model;

Fig. 4 is the schematic diagram of PWM control circuit in the utility model;

Fig. 5 is the schematic diagram of motor control circuit in the utility model;

Fig. 6 is a schematic diagram of the temperature detection circuit in the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model will be further described,

A circuit for seawater desalination system, including basic circuit of STC12C5628AD chip, 112-5V voltage conversion circuit, liquid level measurement circuit, PWM control circuit, motor control circuit and temperature detection circuit.

As shown in Figure 1, the basic circuit of the STC12C5628AD chip includes a single-chip microcomputer chip U2, the first resistor R1, the third voltage dividing resistor R3, the fourth voltage dividing resistor R4, the fifth resistor R5, the ninth electrolytic capacitor C9, and the tenth capacitor C10 , the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13, the first light-emitting diode DS1, the second light-emitting diode DS2, the first switch S1, the crystal oscillator Y1; one end of the fifth resistor R5 is connected to the ground, The other end is connected with the negative end of the ninth electrolytic capacitor C9 and the third pin of the single-chip microcomputer chip U2, and the positive end of the ninth electrolytic capacitor C9 is connected with the high level; one end of the third voltage dividing resistor R3 is connected with the high level The other end is connected with the anode of the first light-emitting diode DS1, the cathode of the first light-emitting diode DS1 is connected with the second pin of the single-chip microcomputer chip U2; one end of the fourth voltage dividing resistor R4 is connected with the high level, The other end is connected to the anode of the second light-emitting diode DS2, and the cathode of the second light-emitting diode DS2 is connected to the first pin of the single-chip microcomputer chip U2; one end of the first switch S1 is grounded, and at the same time, it is connected to one end of the tenth capacitor C10 The other end of the first switch S1 is connected to one end of the first resistor R1, the other end of the tenth capacitor C10, and the ground 27 pin of the single-chip microcomputer chip U2; the other end of the first resistor R1 is connected to the high level; the second One end of the eleventh capacitor C11 is connected to the 28th pin of the high-level, single-chip microcomputer chip U2; the other end of the eleventh capacitor C11 is connected to the ground; one end of the twelfth capacitor C12 is connected to the ground; the twelfth The other end of the capacitor C12 is connected to one end of the first crystal oscillator Y1 and the sixth pin of the single-chip microcomputer chip U2; one end of the thirteenth capacitor C13 is connected to the ground; the other end of the thirteenth capacitor C13 is connected to the first crystal oscillator Y1 The other end is connected to the 7th pin of the single-chip microcomputer chip U2.

As shown in FIG. 2, the 12-5V voltage conversion circuit includes a third electrolytic capacitor C3, a fourth capacitor C4, a voltage stabilizing block U1, a fifth electrolytic capacitor C5, and a sixth capacitor C6. The positive pole of the third electrolytic capacitor C3 is connected to the positive +12V power supply, one end of the fourth capacitor C4, and Vin of the voltage stabilizing block U1; the other end of the third electrolytic capacitor C3 is connected to the other end of the fourth capacitor C4, and the voltage stabilizing block U1. The GND pin, the negative pole of the fifth electrolytic capacitor C5, and one end of the sixth capacitor C6 are connected and grounded at the same time; the positive pole of the fifth electrolytic capacitor C5 is connected to the Vout pin of the voltage stabilizing block U1, the other end of the sixth capacitor C6, VCC connect.

As shown in FIG. 3 , the liquid level measurement circuit includes a chip U3, a second capacitor C2, an eighth resistor R8, an interface J5, an interface J1, and a ninth resistor R9. The first pin of the chip U3 is connected to the ninth pin of the single-chip microcomputer chip U2; the second pin of the chip U3 is connected to the tenth pin of the single-chip microcomputer chip U2; the seventh pin of U3 is connected to the first pin of the single-chip microcomputer chip U2 The 13 pins are connected; the 16th pin of the chip U3 is connected to one end of the second capacitor C2 at a high level; the other end of the second capacitor C2 is connected to the 15th pin of the chip U3 at a low level; One end of the eighth resistor R8 is connected to the high-level VCC; the other end of the eighth resistor R8 is connected to the 14th pin of the chip U3 and the first pin of the interface J5; the second pin of the interface J5 is connected to the low-level One end of the ninth resistor R9 is connected to the high-level VCC; the other end of the ninth resistor R9 is connected to the thirteenth pin of the chip U3 and the first pin of the interface J1; the second pin of the interface J1 The pin is connected with the low level; the 8th pin and the 10th pin of the chip U3 are connected with the low level.

As shown in FIG. 4 , the PWM control circuit includes a second resistor R2, a first field effect transistor Q1, a first rectifier diode D1, a first inductor L1, a seventh electrolytic capacitor C7, an eighth capacitor C8, and an interface J2. One end of the second resistor R2 is connected to the seventeenth pin of the microcontroller U2 and the gate of the first field effect transistor Q1; the other end of the second resistor R2 is connected to the low level; the source of the first field effect transistor Q1 The pole is connected to the low level; the drain of the first field effect transistor Q1 is connected to the positive pole of the first rectifier tube D1, the negative pole of the seventh electrolytic capacitor C7, one end of the eighth capacitor C8, and the second pin of the interface J2 The negative pole of the first rectifier diode D1 is connected to one end of the first inductor L1 and the +12V power supply; the other end of the first inductor L1 is connected to the positive pole of the seventh electrolytic capacitor C7, the other end of the eighth capacitor C8, and the first terminal of the interface J2 One pin connected.

As shown in FIG. 5 , the motor control circuit includes a sixth resistor R6, a second field effect transistor Q2, a second rectifier diode D2, and an interface J3. One end of the sixth resistor is connected to the 25 pin of the single-chip microcomputer chip U2 and the gate of the second field effect transistor Q2; the other end of the sixth resistor R6 is connected to the low level; the source of the second field effect transistor Q2 is connected to The low level is connected; the drain of the second field effect transistor Q2 is connected with the anode of the second rectifier diode D2 and the second pin of the interface J3; the cathode of the second rectifier diode D2 is connected with the first pin of the interface J3, +12V power supply connected;

As shown in FIG. 6, the temperature detection circuit includes an interface J4, a seventh resistor R7, and a first capacitor C1. The first pin of the interface J4 is connected to the low level; the second pin of the interface J4 is connected to one end of the seventh resistor R7 and the eighteenth pin of the single-chip microcomputer chip U2; the third pin of the interface J4 is connected to the first One end of a capacitor C1 and the other end of the seventh resistor R7 are connected to a high level; the other end of the first capacitor C1 is connected to a low level.

The model of the voltage stabilizing block U1 is LM2940, the model of the single-chip microcomputer chip U2 is STC12C5628AD, and the model of the chip U3 is 74HC165,

The model of interface J1, interface J2, interface J3, and interface J5 is HEAD2, and the model of interface J4 is HEAD3;

The first resistor R1 is 1K ohms, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 are all 10K ohms, the second resistor R2, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 , the ninth resistor R9 are both 5K ohms;

The first capacitor C1 and the second capacitor C2 are both 104uF, the third electrolytic capacitor C3, the fifth electrolytic capacitor C5, and the seventh electrolytic capacitor C7 are all 100uF, the ninth electrolytic capacitor C9 is 10uF, and the tenth capacitor C10 is 105uF, the fourth capacitor C4, the sixth capacitor C6, the eighth capacitor C8, the eleventh capacitor C11, the twelfth capacitor C12, and the thirteenth capacitor C13 are all 0.1uF;

The crystal oscillator Y1 is 6MHz, the models of the first field effect transistor Q1 and the second field effect transistor Q2 are IRLR7843; the models of the first rectifier diode D1 and the second rectifier diode D2 are SS34; the first inductor L1 is 200uH.

Claims (2)

1. for a circuit for seawater desalination system, it is characterized in that comprising basic circuit, 112-5V voltage conversion circuit, level gauging circuit, pwm control circuit, circuit for controlling motor and the temperature sensing circuit of STC12C5628AD chip;

The basic circuit of STC12C5628AD chip comprises singlechip chip U2, the first resistance R 1, the 3rd divider resistance R3, the 4th divider resistance R4, the 5th resistance R 5, the 9th electrochemical capacitor C9, the tenth capacitor C the 10, the 11 capacitor C the 11, the 12 capacitor C the 12, the 13 capacitor C 13, the first light emitting diode DS1, the second light emitting diode DS2, the first switch S 1, crystal oscillator Y1; One end of the 5th resistance R 5 joins with ground, and the 3rd pin of the negative pole end of the other end and the 9th electrochemical capacitor C9, singlechip chip U2 joins, and positive terminal and the high level of the 9th electrochemical capacitor C9 join; One end and the high level of the 3rd divider resistance R3 join, and the positive pole of the other end and the first light emitting diode DS1 joins, and the second pin of the negative pole of the first light emitting diode DS1 and singlechip chip U2 joins; One end and the high level of the 4th divider resistance R4 join, and the positive pole of the other end and the second light emitting diode DS2 joins, and the first pin of the negative pole of the second light emitting diode DS2 and singlechip chip U2 joins; One end ground connection of the first switch S 1, joins with one end of the tenth capacitor C 10 simultaneously; Ground 27 pins of the other end of one end of the other end of the first switch S 1 and the first resistance R 1, the tenth capacitor C 10, singlechip chip U2 join; The other end and the high level of the first resistance R 1 join; The 28th pin of one end of the 11 capacitor C 11 and high level, singlechip chip U2 joins; The other end of the 11 capacitor C 11 joins with ground; One end of the 12 capacitor C 12 joins with ground; The 6th pin of one end of the other end of the 12 capacitor C 12 and the first crystal oscillator Y1, singlechip chip U2 joins; One end of the 13 capacitor C 13 joins with ground; The 7th pin of the other end of the other end of the 13 capacitor C 13 and the first crystal oscillator Y1, singlechip chip U2 joins.

2. a kind of circuit for seawater desalination system as claimed in claim 1, is characterized in that

12-5V voltage conversion circuit comprises the 3rd electrochemical capacitor C3, the 4th capacitor C 4, regulator block U1, the 5th electrochemical capacitor C5, the 6th capacitor C 6; The positive pole of the 3rd electrochemical capacitor C3 joins with the Vin of just+12V power supply, the 4th capacitor C 4 one end, regulator block U1; One end of the GND pin of the other end of the other end of the 3rd electrochemical capacitor C3 and the 4th capacitor C 4, regulator block U1, the negative pole of the 5th electrochemical capacitor C5, the 6th capacitor C 6 joins, simultaneously ground connection; The Vout pin of the positive pole of the 5th electrochemical capacitor C5 and regulator block U1, the other end of the 6th capacitor C 6, VCC join.

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