CN112157118A - Soil detection and restoration device - Google Patents
Soil detection and restoration device Download PDFInfo
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- CN112157118A CN112157118A CN202010989467.9A CN202010989467A CN112157118A CN 112157118 A CN112157118 A CN 112157118A CN 202010989467 A CN202010989467 A CN 202010989467A CN 112157118 A CN112157118 A CN 112157118A
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- inverting input
- relay
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 239000002689 soil Substances 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 239000005416 organic matter Substances 0.000 claims abstract description 24
- 230000010355 oscillation Effects 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000005067 remediation Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention relates to the technical field of environmental protection, and provides a soil detection and repair device which comprises a sensor interface circuit and a heating unit which are connected with a main control circuit, wherein the sensor interface circuit is used for being connected with an organic matter detection sensor, the soil detection and repair device also comprises a temperature control circuit, the temperature control circuit comprises an oscillation branch circuit, a time base chip U1, a frequency decoding chip U2 and a relay K1, the oscillation branch circuit comprises a resistor R1, a thermistor R2 and a capacitor C1 which are sequentially connected, one end of the resistor R1 is connected with an RST end of the time base chip U1, one end of the capacitor C1 connected with the resistor R2 is connected with a TRIG end of the time base chip U1, the other end of the capacitor C1 is grounded, an OUT end of the time base chip U1 is connected with an IN end of the frequency decoding chip U2, an OUT end of the frequency decoding chip U2 is connected with a coil of the relay K1, and. Through above-mentioned technical scheme, the problem that soil prosthetic devices circuit structure is complicated among the prior art, the fault rate is high has been solved.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a soil detection and repair device.
Background
With the continuous acceleration of the industrialization process, the soil pollution is serious due to the unreasonable exploitation of mineral resources, smelting discharge of the mineral resources, sewage irrigation and sludge application to the soil for a long time, atmospheric sedimentation caused by artificial activities, application of chemical fertilizers and pesticides and the like. Chinese soil pollution threatens the sustainable utilization of land resources and the ecological safety of agricultural products. The farmland polluted by organic pollutants in China reaches 3600 ten thousand hectares, and the types of the pollutants comprise petroleum, polycyclic aromatic hydrocarbon, pesticide, organic chlorine and the like; the area of the seriously petroleum-polluted land caused by oil field exploitation reaches 1 ten thousand hectares, and the large-area land is polluted by the petroleum refining industry; in the sinking and pacifying petroleum sewage irrigation area, the content of polycyclic aromatic hydrocarbon in surface soil and bottom soil exceeds 600mg/kg, which causes serious pollution to crops and underground water.
The thermal desorption technology is one of the most advanced polluted waste treatment technologies in the world, and is used for heating soil polluted by organic matters to be above the boiling point of the organic matters in a heating mode, volatilizing the organic matters in the adsorbed soil into a gas state and then separating and treating the gas state. The soil remediation device is manufactured according to the principle, and at present, the soil remediation device on the market has the problems of complex circuit structure and high failure rate.
Disclosure of Invention
The invention provides a soil detection and repair device, which solves the problems of complex circuit structure and high failure rate of the soil repair device in the prior art.
The technical scheme of the invention is as follows: comprises a sensor interface circuit and a heating unit which are both connected with a master control circuit, the sensor interface circuit is used for being connected with an organic matter detection sensor, the device also comprises a temperature control circuit, the temperature control circuit comprises an oscillation branch circuit, a time base chip U1, a frequency decoding chip U2 and a relay K1,
the oscillation branch comprises a resistor R1, a thermistor R2 and a capacitor C1 which are sequentially connected, one end of the resistor R1 is connected with the RST end of the time-base chip U1, one end of the capacitor C1 connected with the resistor R2 is connected with the TRIG end of the time-base chip U1, the other end of the capacitor C1 is grounded,
the OUT end of the time base chip U1 is connected with the IN end of the frequency decoding chip U2, the OUT end of the frequency decoding chip U2 is connected with one end of a coil of a relay K1, the other end of the coil of the relay K1 is connected with a first direct current power supply, and a normally open contact of the relay K1 is connected into a power supply circuit of the heating unit.
Further, the device also comprises a control output circuit, the control output circuit comprises a triode Q1 and a relay K2 which are connected in sequence,
the base electrode of the triode Q1 is connected with the main control circuit, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of the coil of the relay K2, the other end of the coil of the relay K2 is connected with the first direct current power supply, and the normally open contact of the relay K2 is connected into the power supply circuit of the temperature control circuit.
Further, the sensor interface circuit comprises a signal conversion circuit and an amplifying circuit which are connected in sequence,
the input end of the signal conversion circuit is used for being connected with the organic matter detection sensor, the output end of the amplifying circuit is connected with the main control circuit,
the signal conversion circuit comprises a resistor R41, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U4A, one end of the resistor R41 is connected with a current output end I _ IN1 of the organic matter detection sensor, the other end of the resistor R41 is connected with a current output end I _ IN2 of the organic matter detection sensor,
one end of the resistor R41 is also connected with the inverting input end of the operational amplifier U5A, the other end of the resistor R41 is connected with the inverting input end of the operational amplifier U5B,
a resistor R42 is connected between the output end and the non-inverting input end of the operational amplifier U5A, a resistor R44 is connected between the output end and the non-inverting input end of the operational amplifier U5B, the resistance values of the resistor R42 and the resistor R44 are the same, a resistor R43 is connected between the resistor R42 and the resistor R44,
a resistor R45 is connected between the output end of the operational amplifier U5A and the inverting input end of the operational amplifier U4A, a resistor R47 is connected between the output end of the operational amplifier U5B and the non-inverting input end of the operational amplifier U4A, the resistances of the resistor R45 and the resistor R47 are the same,
a resistor R46 is connected between the output end and the inverting input end of the operational amplifier U4A, the non-inverting input end of the operational amplifier U4A is grounded through a resistor R48, and the resistance values of the resistor R46 and the resistor R48 are the same.
Further, the amplifying circuit comprises an operational amplifier U6, a non-inverting input terminal of the operational amplifier U6 is connected with an output terminal of the operational amplifier U4A through a resistor R17, an inverting input terminal of the operational amplifier U6 is connected with a bias circuit through a resistor R14, a resistor R15 is connected between an output terminal and an inverting input terminal of the operational amplifier U6,
the output end of the operational amplifier U6 is also connected with the main control circuit.
Further, the bias circuit comprises a potentiometer WR1, a resistor R12 and a resistor R13 which are connected in sequence,
one fixed end of the potentiometer WR1 is connected with a first direct current power supply, the other fixed end of the potentiometer WR1 is connected with a second direct current power supply, the sliding end of the potentiometer WR1 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with the resistor R14, and one end of the resistor R13 is grounded.
Further, the overvoltage protection circuit comprises a resistor R3, a voltage regulator tube VD3, a triode Q2 and a MOS tube M1,
the cathode of the voltage-stabilizing tube VD3 is connected with an external direct-current power supply through a resistor R3, the anode of the voltage-stabilizing tube VD3 is grounded,
the base electrode of the triode Q2 is connected with the cathode of the voltage regulator VD3 through a resistor R4, the emitter electrode of the triode Q2 is connected with an external direct current power supply, the collector electrode of the triode Q2 is grounded through a resistor R6,
a resistor R5 is connected in parallel between the collector and the emitter of the triode Q2, one end of the resistor R5 is connected with the S pole of the MOS tube M1, one end of the resistor R5 is connected with the G pole of the MOS tube M1, and the D pole of the MOS tube M1 outputs the first direct current power supply.
Further, the triode voltage stabilizer further comprises a voltage stabilizing tube VD4, the cathode of the voltage stabilizing tube VD4 is connected with the emitter of the triode Q2, and the anode of the voltage stabilizing tube VD4 is connected with the base of the triode Q2.
Further, the output filter circuit comprises a resistor R19 and a capacitor C19 which are connected in sequence, one end of the resistor R19 is connected with the output end of the operational amplifier U6, and one end of the capacitor C19 is grounded.
Furthermore, a capacitor C15 is connected in parallel to two ends of the resistor R15.
Furthermore, the inverting input end of the operational amplifier U6 is grounded through a capacitor C16 and a resistor R16 in sequence.
The working principle and the beneficial effects of the invention are as follows:
the main control circuit reads the data of the organic matter content from the sensor interface circuit, and when the organic matter content exceeds a set range, the main control circuit starts the heating unit to process the organic matter. The temperature control circuit is arranged to realize automatic control of heating temperature, so that the temperature requirement of organic matter treatment can be met, and resources can be saved. The working process of the temperature control circuit is as follows:
the thermistor R2 is arranged IN the heating unit and used for detecting heating temperature, the resistance value of the thermistor R2 is continuously reduced along with the rise of the temperature, the oscillation frequency of an oscillation branch consisting of the resistor R1, the thermistor R2 and the capacitor C1 is sent to the IN end of the frequency decoding chip U2 through the OUT end of the time base chip U1, when the temperature exceeds a set value, the oscillation frequency exceeds the central frequency of the frequency decoding chip U2, the OUT end of the frequency decoding chip U2 outputs high level, the coil of the relay K1 is powered off, the power supply of the heating unit is disconnected, and the heating unit stops heating; then the temperature is gradually reduced, the thermistor R2 is gradually increased, when the temperature is reduced to a set value, the oscillation frequency falls into the central frequency range of the frequency decoding chip U2, the OUT end of the frequency decoding chip U2 outputs low level, the coil of the relay K1 is electrified, the power supply of the heating unit is switched on, and the heating unit starts to heat; the heating unit is circularly controlled.
The circuit of the invention has simple structure, stable work and low failure rate.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a schematic diagram of a temperature control circuit according to the present invention;
FIG. 3 is a schematic diagram of a control output circuit according to the present invention;
FIG. 4 is a schematic diagram of a signal conversion circuit according to the present invention;
FIG. 5 is a schematic diagram of an amplifying circuit according to the present invention;
FIG. 6 is a schematic diagram of an overvoltage protection circuit of the present invention;
in the figure: the device comprises a main control circuit 1, a sensor interface unit 2, a signal conversion circuit 21, an amplification circuit 22, a bias circuit 221, a heating unit 3, a temperature control circuit 4, a control output circuit 5 and an overvoltage protection circuit 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
As shown in fig. 1, a schematic block diagram of a circuit of the soil detection and remediation device of this embodiment includes a sensor interface circuit and a heating unit 3 both connected to a main control circuit 1, the sensor interface circuit is used for being connected to an organic matter detection sensor, and further includes a temperature control circuit 4, the temperature control circuit 4 includes an oscillation branch, a time base chip U1, a frequency decoding chip U2 and a relay K1,
the oscillation branch comprises a resistor R1, a thermistor R2 and a capacitor C1 which are connected in sequence, one end of the resistor R1 is connected with the RST end of the time-base chip U1, one end of the capacitor C1 connected with the resistor R2 is connected with the TRIG end of the time-base chip U1, the other end of the capacitor C1 is grounded,
the OUT end of the time base chip U1 is connected with the IN end of the frequency decoding chip U2, the OUT end of the frequency decoding chip U2 is connected with one end of a coil of the relay K1, the other end of the coil of the relay K1 is connected with the first direct-current power supply, and a normally open contact of the relay K1 is connected into a power supply circuit of the heating unit 3.
In this embodiment, the main control circuit 1 reads the data of the organic matter content from the sensor interface circuit, and when the organic matter content exceeds the set range, the main control circuit 1 starts the heating unit 3 to process the organic matter. The temperature control circuit 4 is arranged to realize automatic control of heating temperature, so that the temperature requirement of organic matter treatment can be met, and resources can be saved. The working process of the temperature control circuit 4 is as follows:
as shown IN fig. 2, the thermistor R2 is disposed IN the heating unit 3 for detecting the heating temperature, the resistance value of the thermistor R2 is continuously decreased with the increase of the temperature, the oscillation frequency of the oscillation branch composed of the resistor R1, the thermistor R2 and the capacitor C1 is sent to the IN end of the frequency decoding chip U2 through the OUT end of the time base chip U1, when the temperature exceeds the set value, the oscillation frequency exceeds the center frequency of the frequency decoding chip U2, the OUT end of the frequency decoding chip U2 outputs a high level, the coil of the relay K1 is powered off, the power supply of the heating unit 3 is disconnected, and the heating unit 3 stops heating; then the temperature is gradually reduced, the thermistor R2 is gradually increased, when the temperature is reduced to a set value, the oscillation frequency falls into the central frequency range of the frequency decoding chip U2, the OUT end of the frequency decoding chip U2 outputs low level, the coil of the relay K1 is electrified, the power supply of the heating unit 3 is switched on, and the heating unit 3 starts to heat; the heating unit 3 is automatically controlled by the circulation of the above steps.
The circuit of the embodiment has simple structure, stable work and low failure rate.
Further comprises a control output circuit 5, the control output circuit 5 comprises a triode Q1 and a relay K2 which are connected in sequence,
the base electrode of the triode Q1 is connected with the main control circuit 1, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of the coil of the relay K2, the other end of the coil of the relay K2 is connected with the first direct current power supply, and the normally open contact of the relay K2 is connected into the power supply circuit of the temperature control circuit 4.
As shown in fig. 3, when the main control circuit 1 detects that the organic matter is too high, the main control circuit outputs a control signal to the base of the transistor Q1, the collector and the emitter of the transistor Q1 are turned on, the coil of the relay K2 is energized, the temperature control circuit 4 is energized, and the temperature control circuit 4 starts to operate.
In the embodiment, the temperature control circuit 4 is controlled by controlling the on-off of the power supply of the temperature control circuit 4, so that the heating unit 3 is controlled.
Further, the sensor interface circuit includes a signal conversion circuit 21 and an amplification circuit 22 connected in sequence,
the input end of the signal conversion circuit 21 is used for being connected with the organic matter detection sensor, the output end of the amplifying circuit 22 is connected with the main control circuit 1,
the signal conversion circuit 21 comprises a resistor R41, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U4A, one end of the resistor R41 is connected with a current output end I _ IN1 of the organic matter detection sensor, the other end of the resistor R41 is connected with a current output end I _ IN2 of the organic matter detection sensor,
one end of the resistor R41 is also connected with the inverting input end of the operational amplifier U5A, the other end of the resistor R41 is connected with the inverting input end of the operational amplifier U5B,
a resistor R42 is connected between the output end and the non-inverting input end of the operational amplifier U5A, a resistor R44 is connected between the output end and the non-inverting input end of the operational amplifier U5B, the resistance values of the resistor R42 and the resistor R44 are the same, a resistor R43 is connected between the resistor R42 and the resistor R44,
a resistor R45 is connected between the output end of the operational amplifier U5A and the inverting input end of the operational amplifier U4A, a resistor R47 is connected between the output end of the operational amplifier U5B and the non-inverting input end of the operational amplifier U4A, the resistance values of the resistor R45 and the resistor R47 are the same,
a resistor R46 is connected between the output end and the inverting input end of the operational amplifier U4A, the non-inverting input end of the operational amplifier U4A is grounded through a resistor R48, and the resistance values of the resistor R46 and the resistor R48 are the same.
As shown in fig. 4, the output signal of the organic matter detection sensor is an alternating current signal of 4 to 20mA, and the sensor interface circuit in this embodiment is configured to convert the current signal of 4 to 20mA into a voltage signal that can be recognized by the main control circuit 1, so as to read the output data of the organic matter detection sensor by the main control circuit 1. The signal conversion circuit 21 is used for converting a 4-20 mA current signal into a voltage signal, and the working process is as follows:
4-20 mA current signals are added to two ends of a resistor R41, voltages at two ends of the resistor R41 are respectively connected to inverting input ends of an operational amplifier U5A and an operational amplifier U5B, circuit structures of the operational amplifier U5A and the operational amplifier U5B adopt a symmetrical form, peripheral resistors R42, R43, R44, R45, R46, R47 and R48 all adopt precise resistors, output ends of the operational amplifier U5A and the operational amplifier U5B are respectively connected to an inverting input end and a non-inverting input end of the operational amplifier U4A for differential amplification, and the two ends are beneficial to mutual cancellation of drift, noise, offset voltage, offset current and the like, so that the measurement precision of the circuit is improved.
Further, the amplifying circuit 22 comprises an operational amplifier U6, a non-inverting input terminal of the operational amplifier U6 is connected with an output terminal of the operational amplifier U4A through a resistor R17, an inverting input terminal of the operational amplifier U6 is connected with the bias circuit 221 through a resistor R14, a resistor R15 is connected between an output terminal and an inverting input terminal of the operational amplifier U6,
the output end of the operational amplifier U6 is also connected with the main control circuit 1.
As shown IN fig. 5, the voltage signal output by the operational amplifier U4A is an ac voltage signal, the ac voltage signal is connected to the non-inverting input terminal of the operational amplifier U6, the dc voltage signal output by the bias circuit 221 is connected to the inverting input terminal of the operational amplifier U6, so as to form a subtraction circuit, and a dc bias is added to the ac voltage signal output by the operational amplifier U4A, so as to boost the ac voltage signal, and the ac voltage signal is input to the AD sampling pin ADC _ IN0 of the main control circuit 1.
Further, the bias circuit 221 includes a potentiometer WR1, a resistor R12, and a resistor R13 connected in sequence,
one fixed end of the potentiometer WR1 is connected with a first direct current power supply, the other fixed end of the potentiometer WR1 is connected with a second direct current power supply, the sliding end of the potentiometer WR1 is connected with one end of a resistor R12, the other end of the resistor R12 is connected with a resistor R14, and one end of a resistor R13 is grounded.
As shown in fig. 5, the dc power source i is +15V, the dc power source ii is-15V, one fixed end of the potentiometer WR1 is connected to the dc power source i, the other fixed end is connected to the dc power source ii, the voltage at the sliding end of the potentiometer WR1 can be adjusted by adjusting the position of the sliding end of the potentiometer WR1, the resistor R12 and the resistor R12 form a serial voltage dividing circuit, which is connected between the sliding end of the potentiometer WR1 and the ground, and the voltage division of the resistor R13 can be adjusted by adjusting the position of the sliding end of the potentiometer WR1, so as to adjust the output voltage of the bias circuit 221, and ensure that the voltage polarity at the output end of the operational amplifier U6 meets the requirement of the main control circuit 1.
Further, the output filter circuit is further included, the output filter circuit comprises a resistor R19 and a capacitor C19 which are sequentially connected, one end of the resistor R19 is connected with the output end of the operational amplifier U6, and one end of the capacitor C19 is grounded.
As shown in fig. 5, the resistor R19 and the capacitor C19 form an RC filter circuit, which is connected to the output terminal of the operational amplifier U6 to filter the output signal of the operational amplifier U6, so as to prevent a high-frequency interference signal from entering the main control circuit 1, and ensure reliable operation of the main control circuit 1.
Further, a capacitor C15 is connected in parallel to both ends of the resistor R15.
As shown in fig. 5, the capacitors C15 and C15 are connected in parallel to the two ends of the resistor R15 to form a feedback channel of the high frequency signal, which is beneficial to reducing the amplification factor of the high frequency signal and preventing excessive high frequency signal from entering the main control circuit 1
Further, the inverting input terminal of the operational amplifier U6 is grounded through a capacitor C16 and a resistor R16 in sequence.
As shown in fig. 5, the inverting input terminal of the operational amplifier U6 is grounded through the capacitor C16 and the resistor R16 in sequence, the capacitor C16 is used for filtering high-frequency signals, the high-frequency signals are prevented from entering the operational amplifier U6, and the resistor R16 plays a role in impedance matching.
Further, the overvoltage protection circuit 6 is also included, the overvoltage protection circuit 6 includes a resistor R3, a voltage regulator tube VD3, a triode Q2 and a MOS tube M1,
the cathode of the voltage-stabilizing tube VD3 is connected with an external direct-current power supply through a resistor R3, the anode of the voltage-stabilizing tube VD3 is grounded,
the base electrode of the triode Q2 is connected with the cathode of the voltage regulator VD3 through a resistor R4, the emitter electrode of the triode Q2 is connected with an external direct current power supply, the collector electrode of the triode Q2 is grounded through a resistor R6,
a resistor R5 is connected in parallel between the collector and the emitter of the triode Q2, one end of the resistor R5 is connected with the S pole of the MOS tube M1, one end of the resistor R5 is connected with the G pole of the MOS tube M1, and the D pole of the MOS tube M1 outputs a first direct current power supply.
In the circuit of this embodiment, the external power supply that is set up by overvoltage protection circuit 6 and avoids the excessive voltage inserts, and the specific working process is as follows:
as shown IN fig. 6, the voltage regulation value of the voltage regulator tube is 20V, when the +15V _ IN of the external power supply is within 20V, the voltage regulator tube VD3 is not turned on, which is equivalent to an open circuit, the base of the transistor Q1 is pulled up to +15V _ IN through the resistor R3 and the resistor R4, and the transistor Q1 is turned off; meanwhile, a resistor R5 and a resistor R6 form a resistor voltage dividing circuit and are connected between +15V _ IN and the ground, voltage at two ends of the resistor R5 provides conducting voltage for the MOS tube M1, the S pole and the D pole of the MOS tube M1 are conducted, and +15V _ IN is connected into the circuit to output a first direct current power supply.
When the +15V _ IN of the external power supply is larger than 20V, the voltage of the cathode of the voltage-stabilizing tube VD3 is maintained at 20V, the voltage between the emitter and the base of the triode Q1 is larger than zero, the emitter and the collector of the triode are conducted, the resistor R5 is IN short circuit, the G-pole voltage of the MOS tube M1 is equal to the S-pole voltage, the MOS tube M1 is switched off, and the +15V _ IN is switched off for power supply.
Further, the voltage regulator tube VD4 is further included, the cathode of the voltage regulator tube VD4 is connected with the emitter of the triode Q2, and the anode of the voltage regulator tube VD4 is connected with the base of the triode Q2.
As shown IN fig. 6, IN this embodiment, the voltage regulation value of the voltage regulator VD4 is 4V, and the voltage between the emitter and the base of the transistor Q1 is limited within 4V, so as to prevent the transistor Q1 from being broken down due to the excessive voltage between the emitter and the base of the transistor Q1 when the external power supply +15V _ IN is too high.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The soil detection and repair device comprises a sensor interface circuit and a heating unit (3) which are both connected with a main control circuit (1), the sensor interface circuit is used for being connected with an organic matter detection sensor, and the soil detection and repair device is characterized by also comprising a temperature control circuit (4), the temperature control circuit (4) comprises an oscillation branch circuit, a time base chip U1, a frequency decoding chip U2 and a relay K1,
the oscillation branch comprises a resistor R1, a thermistor R2 and a capacitor C1 which are sequentially connected, one end of the resistor R1 is connected with the RST end of the time-base chip U1, one end of the capacitor C1 connected with the resistor R2 is connected with the TRIG end of the time-base chip U1, the other end of the capacitor C1 is grounded,
the OUT end of the time base chip U1 is connected with the IN end of the frequency decoding chip U2, the OUT end of the frequency decoding chip U2 is connected with one end of a coil of a relay K1, the other end of the coil of the relay K1 is connected with a first direct current power supply, and a normally open contact of the relay K1 is connected into a power supply circuit of the heating unit (3).
2. The soil detection and remediation device of claim 1, further comprising a control output circuit (5), said control output circuit (5) comprising a transistor Q1 and a relay K2 connected in series,
the base electrode of the triode Q1 is connected with the main control circuit (1), the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with one end of the coil of the relay K2, the other end of the coil of the relay K2 is connected with the first direct current power supply, and the normally open contact of the relay K2 is connected into the power supply circuit of the temperature control circuit (4).
3. The soil detection and remediation device of claim 1, wherein said sensor interface circuit comprises a signal conversion circuit (21) and an amplification circuit (22) connected in series,
the input end of the signal conversion circuit (21) is used for being connected with the organic matter detection sensor, the output end of the amplifying circuit (22) is connected with the main control circuit (1),
the signal conversion circuit (21) comprises a resistor R41, an operational amplifier U5A, an operational amplifier U5B and an operational amplifier U4A, one end of the resistor R41 is connected with a current output end I _ IN1 of the organic matter detection sensor, the other end of the resistor R41 is connected with a current output end I _ IN2 of the organic matter detection sensor,
one end of the resistor R41 is also connected with the inverting input end of the operational amplifier U5A, the other end of the resistor R41 is connected with the inverting input end of the operational amplifier U5B,
a resistor R42 is connected between the output end and the non-inverting input end of the operational amplifier U5A, a resistor R44 is connected between the output end and the non-inverting input end of the operational amplifier U5B, the resistance values of the resistor R42 and the resistor R44 are the same, a resistor R43 is connected between the resistor R42 and the resistor R44,
a resistor R45 is connected between the output end of the operational amplifier U5A and the inverting input end of the operational amplifier U4A, a resistor R47 is connected between the output end of the operational amplifier U5B and the non-inverting input end of the operational amplifier U4A, the resistances of the resistor R45 and the resistor R47 are the same,
a resistor R46 is connected between the output end and the inverting input end of the operational amplifier U4A, the non-inverting input end of the operational amplifier U4A is grounded through a resistor R48, and the resistance values of the resistor R46 and the resistor R48 are the same.
4. The soil detection and remediation device of claim 3, wherein the amplification circuit (22) comprises an operational amplifier U6, a non-inverting input of the operational amplifier U6 is connected to the output of the operational amplifier U4A via a resistor R17, an inverting input of the operational amplifier U6 is connected to the bias circuit (221) via a resistor R14, a resistor R15 is connected between the output and the inverting input of the operational amplifier U6,
the output end of the operational amplifier U6 is also connected with the main control circuit (1).
5. The soil detection and remediation device of claim 4, wherein the bias circuit (221) comprises a potentiometer WR1, a resistor R12 and a resistor R13 connected in series,
one fixed end of the potentiometer WR1 is connected with a first direct current power supply, the other fixed end of the potentiometer WR1 is connected with a second direct current power supply, the sliding end of the potentiometer WR1 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with the resistor R14, and one end of the resistor R13 is grounded.
6. The soil detection and repair device of claim 1, further comprising an overvoltage protection circuit (6), wherein the overvoltage protection circuit (6) comprises a resistor R3, a voltage regulator VD3, a triode Q2 and a MOS transistor M1,
the cathode of the voltage-stabilizing tube VD3 is connected with an external direct-current power supply through a resistor R3, the anode of the voltage-stabilizing tube VD3 is grounded,
the base electrode of the triode Q2 is connected with the cathode of the voltage regulator VD3 through a resistor R4, the emitter electrode of the triode Q2 is connected with an external direct current power supply, the collector electrode of the triode Q2 is grounded through a resistor R6,
a resistor R5 is connected in parallel between the collector and the emitter of the triode Q2, one end of the resistor R5 is connected with the S pole of the MOS tube M1, one end of the resistor R5 is connected with the G pole of the MOS tube M1, and the D pole of the MOS tube M1 outputs the first direct current power supply.
7. The soil detection and remediation device of claim 6 further comprising a voltage regulator VD4, the cathode of said voltage regulator VD4 being connected to the emitter of said transistor Q2, and the anode of said voltage regulator VD4 being connected to the base of said transistor Q2.
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| CN202010989467.9A CN112157118A (en) | 2020-09-18 | 2020-09-18 | Soil detection and restoration device |
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| CN202010989467.9A CN112157118A (en) | 2020-09-18 | 2020-09-18 | Soil detection and restoration device |
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- 2020-09-18 CN CN202010989467.9A patent/CN112157118A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203520197U (en) * | 2013-10-05 | 2014-04-02 | 天津市滨海新区塘沽兴达船务有限公司 | Temperature controller used for sewage processing |
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