CN-224216616-U - Simple and easy low-power consumption salt concentration test circuit

CN224216616UCN 224216616 UCN224216616 UCN 224216616UCN-224216616-U

Abstract

The utility model discloses a simple low-power-consumption salt concentration testing circuit which comprises a salt concentration detecting circuit, a singlechip control circuit, a power circuit, a water flow detecting circuit and a nixie tube display circuit, wherein the power circuit is respectively connected with the salt concentration detecting circuit, the singlechip control circuit and the nixie tube display circuit and supplies power for the salt concentration detecting circuit, the singlechip control circuit is connected with the water flow detecting circuit to realize the detection operation of a water inlet state, the singlechip control circuit is connected with the salt concentration detecting circuit to realize the detection operation of the salt concentration in water, and the singlechip control circuit is connected with the nixie tube display circuit to output and display the salt concentration detecting result. The utility model adopts the operational amplifier mode, further improves the reliability and the precision of measurement and ensures the accuracy of the measurement result.

Inventors

CHEN YINGHUA
ZENG CAIHONG
HUANG HAIHAN
LI XINCHEN
CHEN FEIMIN

Assignees

厦门华联电子科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250512

Claims (8)

1. A simple low-power-consumption salt concentration testing circuit is characterized by comprising a salt concentration detecting circuit, a singlechip control circuit, a power supply circuit, a water flow detecting circuit and a nixie tube display circuit, wherein the power supply circuit is respectively connected with the salt concentration detecting circuit, the singlechip control circuit and the nixie tube display circuit and supplies power for the salt concentration detecting circuit, the singlechip control circuit is connected with the water flow detecting circuit to realize detection operation on a water inlet state, the singlechip control circuit is connected with the salt concentration detecting circuit to realize detection operation on salt concentration in water, and the singlechip control circuit is connected with the nixie tube display circuit to output and display salt concentration detecting results.
2. The simple low-power consumption salt concentration test circuit according to claim 1, wherein the salt concentration test circuit comprises a probe J4, an operational amplifier U5A, an operational amplifier U5B, MOS pipe Q1 and a MOS pipe Q2, wherein the source electrode of the MOS pipe Q1 is connected with a power supply circuit, the grid electrode of the MOS pipe Q1 is respectively connected with one end of a resistor R12 and the drain electrode of the MOS pipe Q2, the other end of the resistor R12 is connected with the power supply circuit, the drain electrode of the MOS pipe Q1 is respectively connected with one end of an electrolytic capacitor EC2 and one end of a resistor R13, the grid electrode of the MOS pipe Q2 is respectively connected with one end of a resistor R10 and one end of a resistor R11, the other end of the resistor R10 is connected with a single chip microcomputer control circuit, and the other end of the resistor R13, the source electrode of the MOS pipe Q2 and the other end of the resistor R11 are all grounded; the other end of the electrolytic capacitor EC2 is respectively connected with a first pin of the probe J4 and one end of the resistor R14, the other end of the resistor R14 is respectively connected with one end of the resistor R18, one end of the resistor R15 and one end of the capacitor C11, the other end of the resistor R18 is respectively connected with the positive input end of the operational amplifier U5B, the other end of the resistor R15 and the other end of the capacitor C11 are grounded, the second pin of the probe J4 is respectively connected with the positive input end of the operational amplifier U5A and one end of the resistor R16, the other end of the resistor R16 is grounded, the positive end of the power supply of the operational amplifier U5A is respectively connected with one end of the resistor R17 and one end of the capacitor C12, the other end of the resistor R17 and the other end of the capacitor C12 are respectively connected with the output end of the operational amplifier U5A and one end of the resistor R19, the other end of the resistor R19 is respectively connected with the control circuit of the single chip microcomputer and one end of the capacitor C13, the other end of the capacitor C13 and the power supply negative end of the operational amplifier U5A are grounded, the power supply positive end of the operational amplifier U5B is connected with a power supply circuit, the negative input end of the operational amplifier U5B is respectively connected with one end of the resistor R20 and one end of the capacitor C16, the other end of the resistor R20 and the other end of the capacitor C16 are respectively connected with the output end of the operational amplifier U5B and one end of the resistor R21, the other end of the resistor R21 is respectively connected with a singlechip control circuit and one end of the capacitor C15, and the other end of the capacitor C15 and the power supply negative end of the operational amplifier U5B are grounded.
3. The simple low-power salt concentration test circuit according to claim 2, wherein the water flow detection circuit comprises a transformer T1, one end of an input side of the transformer T1 is connected with one end of a capacitor C19 and a first pin of a pole piece J5 respectively, the other end of the input side of the transformer T1 is connected with one end of a capacitor C18, the other end of the capacitor C18 and the other end of the capacitor C19 are connected with a second pin of the pole piece J5 respectively, the lower end of an output side of the transformer T1 is connected with an anode of a diode D3, a cathode of the diode D3 is connected with one end of a resistor R25, one end of a capacitor C17 and one end of a resistor R26 respectively, the other end of the resistor R26 is connected with a single chip microcomputer control circuit, the upper end of the output side of the transformer T1 is connected with a cathode of a diode D2 and one end of a resistor R24 respectively, the other end of the resistor R24 is connected with the single chip microcomputer control circuit, and the middle end of the output side of the transformer T1, the anode of the diode D2, and the other end of the resistor R25 and the other end of the capacitor C17 are grounded.
4. The simple low-power salt concentration test circuit according to claim 3, wherein the nixie tube display circuit comprises an LED lamp scanning driving chip U4 and a nixie tube display, wherein a DIG1 pin, a DIG2 pin, a DIG3 pin and a DIG4 pin of the LED lamp scanning driving chip U4 are respectively corresponding to and mutually connected with a BIT1 pin, a BIT2 pin, a BIT3 pin and a BIT4 pin of the nixie tube display, an A pin, a B pin, a C pin, a D pin, an E pin, a F pin, a G pin and a DP pin of the LED lamp scanning driving chip U4 are respectively corresponding to and mutually connected with an A pin, a B pin, a C pin, a D pin, an E pin, a F pin, a G pin and a DP pin of the nixie tube display, a VDD pin of the LED lamp scanning driving chip U4 is respectively connected with one end of a capacitor C10, one end of a capacitor EC1 and a power circuit, the other end of the capacitor EC1 is grounded, SDA pin and SCL pin of the LED lamp scanning driving chip U4 are respectively connected with a single chip microcomputer control circuit, and the LED lamp scanning driving chip U4 is grounded.
5. The simple low-power salt concentration test circuit according to claim 4, wherein the SCM control circuit comprises a SCM U2, a P05 pin of the SCM U2 is connected with one end of a key switch SW1, the other end of the key switch SW2 is grounded, a P04 pin and a P24 pin of the SCM U2 are connected with a power supply circuit, a P16 pin of the SCM U2 is connected with one end of a resistor R10, a P15 pin of the SCM U2 is respectively connected with one end of a resistor R19 and one end of a capacitor C13, a P14 pin of the SCM U2 is respectively connected with one end of a capacitor C15 and one end of a resistor R21, a P23 pin of the SCM U2 is connected with one end of a resistor R24, a P21 pin of the SCM U2 is connected with one end of a burning port J3, a P35 pin of the SCM U2 is connected with one end of a burning port J3, a P15 pin of the SCM U2 is respectively connected with a VCC 19 and one end of a capacitor C3, a P22 pin of the SCM U2 is respectively connected with one end of a capacitor C2, a capacitor C2 is connected with one end of a capacitor C2, and one end of a capacitor C2 is respectively connected with one end of a capacitor C3, and one end of a capacitor C2 is connected with one end of a capacitor C3, and one end of a capacitor C3 is respectively connected with the capacitor C3 and the other end of the capacitor C3 and the capacitor C3.
6. The simple low-power salt concentration test circuit according to claim 5, wherein the power supply circuit comprises a lithium battery charging circuit unit and a voltage stabilizing circuit unit, and the lithium battery charging circuit unit IS connected with the voltage stabilizing circuit unit; the lithium battery charging circuit unit comprises a linear charging chip U1 and a TYPE C terminal, wherein a VBUS pin of the TYPE C terminal IS respectively connected with a voltage stabilizing circuit unit, one end of a thermistor RT1, one end of a capacitor C1, one end of a resistor R29 and a VIN pin of the linear charging chip U1, the other end of the thermistor RT1 IS respectively connected with an IS pin of the linear charging chip U1 and one end of a resistor R2, and the other end of the resistor R2, the other end of the capacitor C1 and a GNG pin of the linear charging chip U1 are grounded; the other end of the resistor R29 IS respectively connected with the P04 pin of the singlechip U2 and one end of the resistor R30, the other end of the resistor R30 IS grounded, the CC1 pin of the TYPE C terminal IS connected with one end of the resistor R4, the CC2 pin of the TYPE C terminal IS connected with one end of the resistor R3, the other end of the resistor R4 and the GND pin of the TYPE C terminal are grounded, the ISET pin of the linear charging chip U1 IS connected with one end of the resistor R1, the other end of the resistor R1 IS grounded, the CHRG pin of the linear charging chip U1 IS connected with one end of the indicator LED1, the DONE pin of the linear charging chip U1 IS connected with one end of the indicator LED2, the other end of the indicator LED1 and the other end of the indicator LED2 are connected with one end of the resistor R5, the other end of the resistor R5 IS connected with the voltage stabilizing circuit unit, the VBAT pin of the linear charging chip U1 IS respectively connected with one end of the capacitor C2, the circuit unit and one end of the resistor R27 and a second pin of an external interface J1, the other end of the resistor R27 is respectively connected with one end of the resistor R28, one end of the capacitor C21 and the P24 pin of the singlechip U2, the other end of the capacitor C21 and the other end of the resistor R28 are grounded, and the first pin of the external interface J1, the other end of the capacitor C2 and the EPAD pin of the linear charging chip U1 are grounded.
7. The simple low-power salt concentration test circuit according to claim 6, wherein the voltage stabilizing circuit unit comprises a MOS tube Q3 and a voltage stabilizing chip U3, wherein the drain electrode of the MOS tube Q3 is connected with a VBAT pin of the linear charging chip U1, the grid electrode of the MOS tube Q3 is respectively connected with one end of a resistor R6 and one end of a resistor R7, the other end of the resistor R6 is grounded, the other end of the resistor R7 is respectively connected with the anode of a diode D1, the VBUS pin of a TYPE C terminal and one end of a resistor R5, the cathode of the diode D1 is respectively connected with the source electrode of the MOS tube Q3, one end of a capacitor C7 and one end of an inductor L1, the other end of the capacitor C7 is grounded, the other end of the inductor L1 is respectively connected with a VCC pin of a capacitor C8, a VCC pin of a burning port J3, one end of a capacitor C9, a pin of a singlechip U2, one end of a LED lamp scanning driving chip U4, one end of a capacitor C10, one end of a capacitor C12, one end of a capacitor C1, one end of a capacitor C5 and the other end of a capacitor C1 are respectively connected with the capacitor C1, and one end of a positive end of a capacitor C1 is connected with the capacitor C1, and one end of a positive end of a capacitor C and the capacitor C is connected with the capacitor C1 is connected with the capacitor C and the positive end of the capacitor C is amplified.
8. The simple low-power salt concentration test circuit according to claim 7, wherein the low-power salt concentration test circuit further comprises a water temperature detection circuit, the water temperature detection circuit comprises a water temperature sensor, the water temperature sensor is connected with a sensor interface J2, one end of the sensor interface J2 is respectively connected with one end of a resistor R22, one end of a resistor R23 and one end of a capacitor C20, the other end of the resistor R22 is connected with a VOUT pin of a voltage stabilizing chip U3, the other end of the resistor R23 is connected with a P13 pin of a singlechip U2, and the other end of the capacitor C20 and the other end of the sensor interface J2 are grounded.

Description

Simple and easy low-power consumption salt concentration test circuit Technical Field The utility model relates to the field of water quality detection, in particular to a simple low-power-consumption salt concentration test circuit. Background Salt concentration testing techniques have demonstrated wide application potential in a number of fields, particularly in the fields of water quality monitoring, industrial process control, environmental monitoring, and the like. The salt concentration is used as an important index for evaluating the quality of the water body, and directly reflects the purity and the safety of the water. Water of high salt concentration may contain impurities or contaminants, thereby affecting its applicability as drinking water or industrial water. Therefore, the method has important significance for detecting the salt concentration in the water body. The patent number ZL201110440535.7 discloses an accurate test method for salt content of seawater desalination liquid based on ion concentration and special equipment thereof, which can realize detection operation of salt content in seawater, however, the existing salt concentration detection method generally uses direct current to supply power to the brine, the method is simple, but has the problem of probe polarization, oxidation phenomenon is easily caused at one end of a probe after long-term use, on the other hand, in the existing salt concentration detection circuit on the market, the method is generally used for detecting in a mode that the probe is directly connected with VCC voltage, and under the condition of higher salt concentration, the method can cause overlarge current of the probe and even lower VCC voltage, thereby seriously affecting the accuracy of detection results, and the method is necessary to be improved. Disclosure of Invention The utility model aims to solve the problems and provides a simple and easy low-power-consumption salt concentration test circuit which is simple in structure and convenient to use. In order to achieve the above object, the technical scheme of the present utility model is as follows: A simple low-power-consumption salt concentration testing circuit comprises a salt concentration detecting circuit, a single chip microcomputer control circuit, a power supply circuit, a water flow detecting circuit and a nixie tube display circuit, wherein the power supply circuit is respectively connected with the salt concentration detecting circuit, the single chip microcomputer control circuit and the nixie tube display circuit and supplies power for the salt concentration detecting circuit, the single chip microcomputer control circuit is connected with the water flow detecting circuit to realize detection operation on a water inlet state, the single chip microcomputer control circuit is connected with the salt concentration detecting circuit to realize detection operation on salt concentration in water, and the single chip microcomputer control circuit is connected with the nixie tube display circuit to output and display salt concentration detection results. Further, the salt concentration detection circuit comprises a probe J4, an operational amplifier U5A, an operational amplifier U5B, MOS pipe Q1 and a MOS pipe Q2, wherein the source electrode of the MOS pipe Q1 is connected with a power circuit, the grid electrode of the MOS pipe Q1 is respectively connected with one end of a resistor R12 and the drain electrode of the MOS pipe Q2, the other end of the resistor R12 is connected with the power circuit, the drain electrode of the MOS pipe Q1 is respectively connected with one end of an electrolytic capacitor EC2 and one end of a resistor R13, the grid electrode of the MOS pipe Q2 is respectively connected with one end of a resistor R10 and one end of a resistor R11, the other end of the resistor R10 is connected with a singlechip control circuit, and the other end of the resistor R13, the source electrode of the MOS pipe Q2 and the other end of the resistor R11 are grounded; the other end of the electrolytic capacitor EC2 is respectively connected with a first pin of the probe J4 and one end of the resistor R14, the other end of the resistor R14 is respectively connected with one end of the resistor R18, one end of the resistor R15 and one end of the capacitor C11, the other end of the resistor R18 is respectively connected with the positive input end of the operational amplifier U5B, the other end of the resistor R15 and the other end of the capacitor C11 are grounded, the second pin of the probe J4 is respectively connected with the positive input end of the operational amplifier U5A and one end of the resistor R16, the other end of the resistor R16 is grounded, the positive end of the power supply of the operational amplifier U5A is respectively connected with one end of the power supply circuit and one end of the capacitor C14, the other end of the capacitor C14 is grounded, the negative input