CN107632646A - Low interference temperature automatic control system based on fixed amplitude circuit - Google Patents
Low interference temperature automatic control system based on fixed amplitude circuit Download PDFInfo
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- CN107632646A CN107632646A CN201710985833.1A CN201710985833A CN107632646A CN 107632646 A CN107632646 A CN 107632646A CN 201710985833 A CN201710985833 A CN 201710985833A CN 107632646 A CN107632646 A CN 107632646A
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Abstract
The invention discloses a kind of low interference temperature automatic control system based on fixed amplitude circuit, it is characterized in that, mainly by microcontroller, display, heater control electromagnetic switch, air-blower control electromagnetic switch and the signal processing unit being connected respectively with microcontroller, the heater being connected with heater control electromagnetic switch, the blower fan being connected with air-blower control electromagnetic switch, the analog-to-digital conversion module being connected with signal processing unit, the fixed amplitude circuit being connected with analog-to-digital conversion module, and the temperature sensor composition being connected with fixed amplitude circuit.Detection signal becomes more stable after signal processing unit processes, and the influence that can be excluded the interference signal, so that microcontroller more accurately can be identified and compare to detection signal, improves control accuracy of the present invention to scene temperature.
Description
Technical field
The present invention relates to a kind of control system, in particular to a kind of low interference temperature based on fixed amplitude circuit to automatically control and be
System.
Background technology
Under the promotion of new and high technology, society is just striding into really digitlization, the intelligent, epoch of networking, and temperature
The physical quantity important as one, it is one of technological parameter most universal, important in industrial processes.What it is with industry is disconnected
Development, more and more higher is required to temperature controlled, to temperature controlled requirement also more and more higher.But traditional temperature control system
System is not high to the control accuracy of temperature, is unable to reach the demand of people.
The content of the invention
The defects of it is an object of the invention to overcome traditional temperature control system not high to the control accuracy of temperature, there is provided
A kind of low interference temperature automatic control system based on fixed amplitude circuit.
The purpose of the present invention is achieved through the following technical solutions：Low interference temperature based on fixed amplitude circuit, which automatically controls, is
System, mainly by microcontroller, the display being connected respectively with microcontroller, heater control electromagnetic switch, air-blower control electricity
Magnetic switch and signal processing unit, the heater being connected with heater control electromagnetic switch, with air-blower control electromagnetic switch
The blower fan being connected, the analog-to-digital conversion module being connected with signal processing unit, the fixed ampllitude electricity being connected with analog-to-digital conversion module
Road, and the temperature sensor composition being connected with fixed amplitude circuit；The fixed amplitude circuit includes amplifier P101, one end and amplification
Device P101 negative pole is connected, the resistance R102 of other end ground connection, and plus earth, negative pole are connected with amplifier P101 positive pole
Electric capacity C101, the resistance R103 being in parallel with electric capacity C101, one end is connected with electric capacity C101 negative pole, the other end and temperature
The resistance R101 that sensor is connected, positive pole is connected with electric capacity C101 negative pole, negative pole after resistance R104 with amplifier
Electric capacity C102, the N pole that P101 output end is connected is connected with amplifier P101 output end, P poles after resistance R105 with
The diode D102 that amplifier P101 negative pole is connected, resistance R106, the N pole being in parallel with diode D102 and diode
The diode D101 that D102 P poles are connected, P poles are connected with diode D102 N poles, plus earth, negative pole and modulus turn
The electric capacity C103 that mold changing block is connected, and the resistance being serially connected between amplifier P101 output end and electric capacity C103 negative pole
R107。
The signal processing unit is by process chip U, and negative pole is connected with process chip U IN1+ pins, positive pole and mould
The electric capacity C1 that number modular converter is connected, positive pole meet power supply, the electric capacity C4 of negative pole ground connection, and positive pole is connected with electric capacity C4 positive pole
Connect, the electric capacity C3 that negative pole is connected with electric capacity C4 negative pole, be serially connected in electric capacity C4 positive pole and process chip U VCC pins it
Between resistance R3, N pole be connected after resistance R4 with electric capacity C4 positive pole, P poles are managed after resistance R5 with process chip U GND
The diode D1 that pin is connected, one end is connected with diode D1 P poles, the other end after potentiometer R1 with process chip U's
The resistance R2 that IN- pins are connected, positive pole is connected with potentiometer R1 control terminal, negative pole and process chip U OUT1 pins
The electric capacity C2 being connected, the filter circuit being connected with process chip U OUT1 pins, respectively with filter circuit and electric capacity C4
The signal amplification circuit that positive pole is connected, and the triggers circuit composition being connected with signal amplification circuit；The process chip U
VCC pins connect power supply, its GND pin ground connection.
The filtered electrical routing amplifier P, triode VT5, output end of the negative pole with amplifier P after resistance R16 are connected
Connect, the electric capacity C12 that positive pole is connected with process chip U OUT pins, be serially connected in electric capacity C12 positive pole and triode VT5 base
Resistance R14, P pole between pole is connected with electric capacity C12 positive pole, the diode D6 that N poles are connected with amplifier P positive pole,
The electric capacity C13 that positive pole is connected with electric capacity C12 negative pole, negative pole is connected with amplifier P positive pole, is serially connected in amplifier P's
Resistance R15 between positive pole and triode VT5 colelctor electrode, positive pole is connected with amplifier P negative pole, negative pole and amplifier P
The electric capacity C14 that is connected of output end, the resistance R18 being in parallel with electric capacity C14, one end is connected, separately with amplifier P negative pole
The resistance R17 of one end ground connection, and positive pole is connected with amplifier P output end, negative pole is connected with signal amplification circuit
Electric capacity C15 is formed；The grounded emitter of the triode VT5.
Further, the signal amplification circuit is by triode VT1, triode VT2, the negative pole phase of positive pole and electric capacity C15
Electric capacity C5, the P pole that connection, negative pole are connected after electric capacity C7 with triode VT1 base stage is connected with electric capacity C5 negative pole, N
Diode D2, the N pole of pole ground connection is connected with electric capacity C5 negative pole, the diode D3 that P poles are connected with diode D2 N poles,
The electric capacity C9 that positive pole is connected with triode VT1 emitter stage, negative pole is connected with diode D2 N poles, with electric capacity C9 phases simultaneously
The resistance R7 of connection, the resistance R9 being serially connected between triode VT2 emitter stage and electric capacity C9 negative pole, positive pole and triode VT2
Emitter stage be connected, electric capacity C11, the N pole that negative pole is connected with electric capacity C9 negative pole is connected with diode D2 N poles, P poles
The diode D4 being connected after resistance R8 with triode VT2 colelctor electrode, positive pole is connected with triode VT1 colelctor electrode,
The electric capacity C8 that negative pole is connected with triode VT2 base stage, and positive pole is connected with electric capacity C4 positive pole, negative pole is through resistance R6
The electric capacity C6 compositions being connected afterwards with triode VT1 colelctor electrode；The colelctor electrode of the triode VT2 is negative with electric capacity C6 respectively
Pole and triggers circuit are connected, its emitter stage is then connected with triggers circuit.
The triggers circuit is by triode VT3, and triode VT4, positive pole is connected with triode VT2 emitter stage, negative pole
The electric capacity C10 being connected with triode VT3 base stage, be serially connected in triode VT3 colelctor electrode and triode VT2 colelctor electrode it
Between resistance R10, the resistance R12 being serially connected between triode VT3 colelctor electrode and triode VT4 base stage, one end and three poles
The resistance R11 that pipe VT3 emitter stage is connected, the other end is connected after resistance R13 with triode VT4 base stage, and P poles
It is connected with triode VT4 emitter stage, the diode D5 compositions that N poles are connected with microcontroller；The resistance R11 and resistance
R13 tie point ground connection；The emitter stage of the triode VT4 is connected with triode VT3 emitter stage, and its colelctor electrode is then with three
Pole pipe VT2 colelctor electrode is connected.
The process chip U is LM324 integrated chips.
The present invention compared with the prior art, has advantages below and beneficial effect：
(1) present invention can be handled detection signal, make detection signal more stable, so that microcontroller can be with
More accurately detection signal is identified and compared, improves control accuracy of the present invention to scene temperature.
(2) present invention can be filtered the high-frequency interferencing signal in detection signal, excluded the interference of high-frequency signal, made
The present invention more accurately can be controlled to temperature.
(3) fixed amplitude circuit of the invention with the amplitude of stabilization signal, can further increase the stability of signal.
Brief description of the drawings
Fig. 1 is the overall structure figure of the present invention.
Fig. 2 is the structure chart of the signal processing unit of the present invention.
Fig. 3 is the structure chart of the filter circuit of the present invention.
Fig. 4 is the structure chart of the fixed amplitude circuit of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention are not limited to
This.
Embodiment
As shown in figure 1, the present invention is mainly by microcontroller, display, heater control electromagnetic switch, air-blower control electromagnetism
Switch, heater, blower fan, signal processing unit, analog-to-digital conversion module, fixed amplitude circuit and temperature sensor composition.
The temperature sensor is arranged at scene, for collection site temperature and export corresponding analog signal to fixed ampllitude electricity
Road, it uses the FST600-101 types temperature sensor that Hunan Fierst sensor Co., Ltd produces to realize.Fixed ampllitude electricity
After road is handled signal, analog-to-digital conversion module is transmitted a signal to, the analog-to-digital conversion module is used to export fixed amplitude circuit
Analog signal be converted to data signal and export to signal processing unit, the analog-to-digital conversion module uses AD7810 analog-to-digital conversion cores
Piece realizes that the VIN+ pins of the AD7810 modulus conversion chips are connected with the signal output interface of fixed amplitude circuit, its DOUT
Pin is then connected with the signal input part of signal processing unit.The signal processing unit can be handled data signal,
So as to improve the present invention to temperature controlled precision.
Control centre of the microcontroller as the present invention, it is internally provided with the maximum temperature value that is allowed of scene and most
Detection temperature can be compared with the temperature value of its inner setting for low temperature value, the microcontroller, and export corresponding control
Signal processed controls electromagnetic switch or air-blower control electromagnetic switch to heater, controls heater or blower fan work as needed；Should
Detection signal can also be transferred to display by microcontroller, be shown real time temperature by display；The microcontroller
Realized using AT89S51 single-chip microcomputers, the P1.0I/O interfaces of the AT89S51 single-chip microcomputers and the output end phase of signal processing unit
Connection, its P2.0I/O interface are connected with display, and its P2.1I/O interface then controls the input of electromagnetic switch with heater
It is connected, input of the P2.2I/O interfaces then with air-blower control electromagnetic switch is connected.The heater controls the defeated of electromagnetic switch
Go out end then with the power line of heater to be connected, the power supply for controlling heater turns on and shut-off.The air-blower control electromagnetism is opened
The output end of pass is then connected with the power line of blower fan, and the power supply for controlling blower fan turns on and shut-off.
During work, the real time temperature signal of temperature sensor collection site, and export corresponding analog signal and give fixed ampllitude electricity
Road.The fixed amplitude circuit exports after handling signal to be converted analog signals into analog-to-digital conversion module, analog-to-digital conversion module
Signal processing unit is transferred to after data signal, signal processing unit is transferred to microcontroller after data signal is handled.
The microcontroller is identified to data signal and is compared with the temperature value of its inner setting, is set when the temperature of detection is less than
During fixed lowest temperature angle value, microcontroller sends signal to heater control electromagnetic switch, closes heater control electromagnetic switch
Close, so that heater works；When scene temperature is within the scope of design temperature, heater and blower fan do not work；When
When scene temperature is higher than the maximum temperature value set, microcontroller fan control electromagnetic switch sends signal, makes air-blower control
Electromagnetic switch closes, so that blower fan work.
In order to preferably handle detection signal, as shown in figure 4, the fixed amplitude circuit includes amplifier P101, one
End is connected with amplifier P101 negative pole, the resistance R102 of other end ground connection, and plus earth, negative pole and amplifier P101 are just
The electric capacity C101 that pole is connected, the resistance R103 being in parallel with electric capacity C101, one end is connected with electric capacity C101 negative pole, is another
Hold the resistance R101 that is connected with temperature sensor, positive pole is connected with electric capacity C101 negative pole, negative pole after resistance R104 and
Electric capacity C102, the N pole that amplifier P101 output end is connected is connected with amplifier P101 output end, P poles are through resistance
The diode D102 being connected after R105 with amplifier P101 negative pole, resistance R106, the N pole being in parallel with diode D102 with
The diode D101 that diode D102 P poles are connected, P poles are connected with diode D102 N poles, plus earth, negative pole with
The electric capacity C103 that analog-to-digital conversion module is connected, and be serially connected between amplifier P101 output end and electric capacity C103 negative pole
Resistance R107.
The fixed amplitude circuit can be made analog signal more stable, improved temperature controlled essence with the amplitude of stable simulation signal
Degree.Wherein, analog signal is amplified, diode D101 and diode after resistance R101 inputs are come in through amplifier P101
The amplitude of analog signal can be then defined by D102, make the amplitude of analog signal more stable, the letter of amplifier P101 outputs
Number input to analog-to-digital conversion module after resistance R107.In the present embodiment, the model TL061 of the amplifier, diode
D101 and diode D102 model 1N4001, electric capacity C101, electric capacity C102 and electric capacity C103 capacitance are 0.01 μ F,
Resistance R101 resistance is 10K Ω, and resistance R102 resistance is 5.1K Ω, resistance R103, resistance R104 and resistance R105's
Resistance is 10K Ω, and resistance R106 resistance is 6.2K Ω, and resistance R107 resistance is 5K Ω.
As shown in Fig. 2 the signal processing unit is by process chip U, negative pole is connected with process chip U IN1+ pins,
The electric capacity C1 that positive pole is connected with analog-to-digital conversion module, positive pole meet power supply, the electric capacity C4 of negative pole ground connection, and positive pole and electric capacity C4 are just
The electric capacity C3 that pole is connected, negative pole is connected with electric capacity C4 negative pole, it is serially connected in electric capacity C4 positive pole and process chip U VCC
Resistance R3, N pole between pin is connected after resistance R4 with electric capacity C4 positive pole, P poles after resistance R5 with process chip U's
The diode D1 that GND pins are connected, one end is connected with diode D1 P poles, the other end after potentiometer R1 with handle core
The resistance R2 that piece U IN- pins are connected, positive pole is connected with potentiometer R1 control terminal, negative pole and process chip U OUT1
The electric capacity C2 that pin is connected, the filter circuit being connected with process chip U OUT1 pins, respectively with filter circuit and electric capacity
The signal amplification circuit that C4 positive pole is connected, and the triggers circuit composition being connected with signal amplification circuit.The processing
Chip U VCC pins connect power supply, its GND pin ground connection.
The process chip U, electric capacity C2 and potentiometer R1 form a signal follower, and the signal follower can be to letter
Number waveform be adjusted so that the waveform of signal is more stable, that is, the stability of detection signal is improved, so as to microcontroller
Preferably detection signal can be compared for device, so as to preferably control heater or blower fan to control the temperature at scene
System, improves temperature controlled precision；Regulation potentiometer R1 then can make the waveform of detection signal reach optimum state.The processing
Chip U is LM324 integrated chips, and potentiometer R1 maximum value is 50K Ω, and resistance R2~R5 resistance is 10K Ω, electricity
The capacitance for holding C2 is 0.1 μ F, and electric capacity C1 capacitance is that 0.01 μ F, electric capacity C3 and electric capacity C4 capacitance are 470 μ F, diode D1
It is then 1N4001 type diodes.
The detection signal that the signal amplification circuit can export to filter circuit is amplified processing, and it is by triode
VT1, triode VT2, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C11, diode D2, diode D3, two
Pole pipe D4, resistance R6, resistance R7, resistance R8 and resistance R9 are formed.
During connection, electric capacity C5 positive pole is connected with filter circuit, base stage phase of the negative pole after electric capacity C7 with triode VT1
Connection.Diode D2 P poles are connected with electric capacity C5 negative pole, N poles ground connection.Diode D3 N poles and electric capacity C5 negative pole phase
Connection, P poles are connected with diode D2 N poles.Electric capacity C9 positive pole is connected with triode VT1 emitter stage, negative pole and two
Pole pipe D2 N poles are connected.Resistance R7 is in parallel with electric capacity C9.Resistance R9 is serially connected in triode VT2 emitter stage and electric capacity C9
Negative pole between.Electric capacity C11 positive pole is connected with triode VT2 emitter stage, and negative pole is connected with electric capacity C9 negative pole.Two
Pole pipe D4 N poles are connected with diode D2 N poles, and colelctor electrode of the P poles with triode VT2 after resistance R8 is connected.Electric capacity
C8 positive pole is connected with triode VT1 colelctor electrode, and negative pole is connected with triode VT2 base stage.Electric capacity C6 positive pole with
Electric capacity C4 positive pole is connected, and colelctor electrode of the negative pole with triode VT1 after resistance R6 is connected.The collection of the triode VT2
Electrode is connected with electric capacity C6 negative pole and triggers circuit respectively, and its emitter stage is then connected with triggers circuit.
The detection signal of filter circuit output is input to by triode after diode D2 and diode D3 carries out amplitude limit
The amplifier that VT1, triode VT2, electric capacity C8, resistance R9, resistance R7 and electric capacity C9 are formed is amplified processing.By putting
Detection signal after big becomes apparent from, so that microcontroller can preferably be identified to detection signal, compare, so as to more
Good is controlled to temperature.Triode VT1 model 3AX31, triode VT2 model are then 2SC1815, electric capacity
C5, electric capacity C7 and electric capacity C8 capacitance are 0.01 μ F, and electric capacity C6, electric capacity C9 and electric capacity C11 capacitance is 470 μ F, and two
Pole pipe D2 and diode D3 model are 1N4148, and diode D4 model is then 1N4001.Resistance R6 resistance is 100K
Ω, resistance R8 resistance are that 4.7K Ω, resistance R7 and resistance R9 resistance are 470K Ω.
In addition, the triggers circuit can carry out further Shape correction to the detection signal that signal amplification circuit exports,
It is by triode VT3, triode VT4, electric capacity C10, resistance R10, resistance R11, resistance R12, resistance R13 and diode D5 groups
Into.
Wherein, electric capacity C10 positive pole is connected with triode VT2 emitter stage, and negative pole is connected with triode VT3 base stage
Connect.Resistance R10 is serially connected between triode VT3 colelctor electrode and triode VT2 colelctor electrode.Resistance R12 is serially connected in triode
Between VT3 colelctor electrode and triode VT4 base stage.Resistance R11 one end is connected with triode VT3 emitter stage, another
The base stage with triode VT4 after resistance R13 is held to be connected.Diode D5 P poles are connected with triode VT4 emitter stage, N
Pole is connected with the P1.0I/O interfaces of microcontroller.The tie point ground connection of the resistance R11 and resistance R13.The triode
VT4 emitter stage is connected with triode VT3 emitter stage, and colelctor electrode of its colelctor electrode then with triode VT2 is connected.
The triode VT3, triode VT4, resistance R12, resistance R13 and resistance R11 collectively form a Schmidt and touched
Device is sent out, the Schmidt trigger can carry out further shaping to the waveform of detection signal, avoid waveform from distortion occur, so as to
Microcontroller preferably can be identified and compare to detection signal, so as to improve the present invention to temperature controlled precision.Should
Triode VT3 and triode VT4 model are 3DG12C, and electric capacity C10 capacitance is 0.1 μ F, resistance R10 and resistance R12
The resistance that resistance is 1K Ω, resistance R11 and resistance R13 is 22K Ω, and diode D5 is then 1N4001 type diodes.
The filter circuit can filter to the process chip U detection signals exported, so as to filter out in detection signal
High-frequency interferencing signal, its structure is as shown in figure 3, by amplifier P, triode VT5, resistance R14, resistance R15, resistance R16, resistance
R17, resistance R18, diode D6, electric capacity C12, electric capacity C13, electric capacity C14 and electric capacity C15 are formed.
During connection, the output end of electric capacity C12 negative pole with amplifier P after resistance R16 is connected, positive pole and process chip
U OUT pins are connected.Resistance R14 is serially connected between electric capacity C12 positive pole and triode VT5 base stage.Diode D6 P
Pole is connected with electric capacity C12 positive pole, and N poles are connected with amplifier P positive pole.Electric capacity C13 positive pole and electric capacity C12 negative pole
It is connected, negative pole is connected with amplifier P positive pole.Resistance R15 is serially connected in amplifier P positive pole and triode VT5 current collection
Between pole.Electric capacity C14 positive pole is connected with amplifier P negative pole, and negative pole is connected with amplifier P output end.Resistance R18
It is in parallel with electric capacity C14.Resistance R17 one end is connected with amplifier P negative pole, other end ground connection.Electric capacity C15 positive pole with
Amplifier P output end is connected, and negative pole is connected with electric capacity C5 positive pole.The grounded emitter of the triode VT5.
Common group of the amplifier P, triode VT5, electric capacity C13, electric capacity C12, diode D6, resistance R14 and resistance R15
The high-pass filter for being 1MHZ into a cut-off frequency, the high-pass filter can be carried out the interference signal in detection signal
Filter.Amplifier P uses OPA603 type amplifiers, and triode VT5 model 3DG6, electric capacity C12 and electric capacity C13 capacitance are equal
Capacitance for 100PF, electric capacity C14 and electric capacity C15 is 5PF, and diode D6 is 1N4001 type diodes, resistance R14~R16's
The resistance that resistance is 10K Ω, resistance R17 and resistance R18 is 50K Ω.
Detection signal becomes more stable after signal processing unit processes, and the shadow that can be excluded the interference signal
Ring, so that microcontroller more accurately can be identified and compare to detection signal, improve the present invention to scene temperature
Control accuracy.
As described above, the present invention can be realized well.
Claims (4)
1. the low interference temperature automatic control system based on fixed amplitude circuit, it is characterised in that mainly by microcontroller, respectively with it is micro-
Display, heater control electromagnetic switch, air-blower control electromagnetic switch and the signal processing unit that controller is connected, with adding
The heater that hot device control electromagnetic switch is connected, the blower fan being connected with air-blower control electromagnetic switch, with signal processing unit
The analog-to-digital conversion module being connected, the fixed amplitude circuit being connected with analog-to-digital conversion module, and the temperature being connected with fixed amplitude circuit
Spend sensor group into；The fixed amplitude circuit includes amplifier P101, and one end is connected with amplifier P101 negative pole, another termination
The resistance R102 on ground, the electric capacity C101 that plus earth, negative pole are connected with amplifier P101 positive pole, is in parallel with electric capacity C101
Resistance R103, the resistance R101 that one end is connected with electric capacity C101 negative pole, the other end is connected with temperature sensor, positive pole
It is connected with electric capacity C101 negative pole, the electric capacity C102, N that negative pole is connected after resistance R104 with amplifier P101 output end
The diode that pole is connected with amplifier P101 output end, P poles are connected after resistance R105 with amplifier P101 negative pole
D102, resistance R106, the N pole being in parallel with diode D102 is connected with diode D102 P poles, P poles and diode D102
N poles the diode D101, the electric capacity C103 that plus earth, negative pole are connected with analog-to-digital conversion module that are connected, and concatenation
Resistance R107 between amplifier P101 output end and electric capacity C103 negative pole；
The signal processing unit is by process chip U, and negative pole is connected with process chip U IN1+ pins, positive pole and modulus turn
The electric capacity C1 that mold changing block is connected, positive pole meet power supply, the electric capacity C4 of negative pole ground connection, and positive pole is connected with electric capacity C4 positive pole, born
The electric capacity C3 that pole is connected with electric capacity C4 negative pole, the electricity being serially connected between electric capacity C4 positive pole and process chip U VCC pins
R3 is hindered, N poles are connected after resistance R4 with electric capacity C4 positive pole, P poles are connected after resistance R5 with process chip U GND pins
The diode D1 connect, one end is connected with diode D1 P poles, IN- pin of the other end after potentiometer R1 with process chip U
The resistance R2 being connected, positive pole is connected with potentiometer R1 control terminal, negative pole is connected with process chip U OUT1 pins
Electric capacity C2, the filter circuit being connected with process chip U OUT1 pins, respectively the positive pole with filter circuit and electric capacity C4 be connected
The signal amplification circuit connect, and the triggers circuit composition being connected with signal amplification circuit；The VCC pipes of the process chip U
Pin connects power supply, its GND pin ground connection；
The filtered electrical routing amplifier P, triode VT5, negative pole are connected, just after resistance R16 with amplifier P output end
The electric capacity C12 that pole is connected with process chip U OUT pins, be serially connected in electric capacity C12 positive pole and triode VT5 base stage it
Between resistance R14, P pole be connected with electric capacity C12 positive pole, the diode D6 that N poles are connected with amplifier P positive pole, positive pole
It is connected with electric capacity C12 negative pole, the electric capacity C13 that negative pole is connected with amplifier P positive pole, is serially connected in amplifier P positive pole
Resistance R15 between triode VT5 colelctor electrode, positive pole is connected with amplifier P negative pole, negative pole and amplifier P it is defeated
Go out the electric capacity C14 that end is connected, the resistance R18 being in parallel with electric capacity C14, one end is connected with amplifier P negative pole, the other end
The resistance R17 of ground connection, and the electric capacity that positive pole is connected with amplifier P output end, negative pole is connected with signal amplification circuit
C15 is formed；The grounded emitter of the triode VT5.
2. the low interference temperature automatic control system according to claim 1 based on fixed amplitude circuit, it is characterised in that described
Signal amplification circuit by triode VT1, triode VT2, positive pole is connected with electric capacity C15 negative pole, negative pole after electric capacity C7 with
Electric capacity C5, the P pole that triode VT1 base stage is connected is connected with electric capacity C5 negative pole, N poles ground connection diode D2, N pole with
The diode D3 that electric capacity C5 negative pole is connected, P poles are connected with diode D2 N poles, the emitter stage of positive pole and triode VT1
It is connected, the electric capacity C9 that negative pole is connected with diode D2 N poles, the resistance R7 being in parallel with electric capacity C9, is serially connected in triode
Resistance R9 between VT2 emitter stage and electric capacity C9 negative pole, positive pole is connected with triode VT2 emitter stage, negative pole with electricity
Electric capacity C11, the N pole that is connected of negative pole for holding C9 is connected with diode D2 N poles, P poles after resistance R8 with triode VT2's
The diode D4 that colelctor electrode is connected, positive pole is connected with triode VT1 colelctor electrode, negative pole and triode VT2 base stage phase
The electric capacity C8 of connection, and positive pole is connected with electric capacity C4 positive pole, colelctor electrode phase of the negative pole after resistance R6 with triode VT1
The electric capacity C6 compositions of connection；The colelctor electrode of the triode VT2 is connected with electric capacity C6 negative pole and triggers circuit respectively, its hair
Emitter-base bandgap grading is then connected with triggers circuit.
3. the low interference temperature automatic control system according to claim 2 based on fixed amplitude circuit, it is characterised in that described
Triggers circuit is by triode VT3, triode VT4, and positive pole is connected with triode VT2 emitter stage, negative pole and triode VT3
The electric capacity C10 that base stage is connected, the resistance R10 being serially connected between triode VT3 colelctor electrode and triode VT2 colelctor electrode,
The resistance R12 being serially connected between triode VT3 colelctor electrode and triode VT4 base stage, one end and triode VT3 emitter stage
It is connected, the resistance R11 that the other end is connected after resistance R13 with triode VT4 base stage, and P poles are with triode VT4's
The diode D5 compositions that emitter stage is connected, N poles are connected with microcontroller；The tie point of the resistance R11 and resistance R13 connect
Ground；The emitter stage of the triode VT4 is connected with triode VT3 emitter stage, its colelctor electrode then current collection with triode VT2
Pole is connected.
4. the low interference temperature automatic control system according to claim 3 based on fixed amplitude circuit, it is characterised in that described
Process chip U is LM324 integrated chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710985833.1A CN107632646A (en) | 2017-10-20 | 2017-10-20 | Low interference temperature automatic control system based on fixed amplitude circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710985833.1A CN107632646A (en) | 2017-10-20 | 2017-10-20 | Low interference temperature automatic control system based on fixed amplitude circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107632646A true CN107632646A (en) | 2018-01-26 |
Family
ID=61104711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710985833.1A Pending CN107632646A (en) | 2017-10-20 | 2017-10-20 | Low interference temperature automatic control system based on fixed amplitude circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107632646A (en) |
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2017
- 2017-10-20 CN CN201710985833.1A patent/CN107632646A/en active Pending
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Application publication date: 20180126 |
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| WD01 | Invention patent application deemed withdrawn after publication |