CN109831262B - Intelligent low temperature stores up grain system signal calibration circuit - Google Patents
Intelligent low temperature stores up grain system signal calibration circuit Download PDFInfo
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Abstract
The invention discloses a signal calibration circuit of an intelligent low-temperature grain storage system, which comprises a frequency acquisition circuit 1, a frequency acquisition circuit 2, a frequency modulation and amplitude modulation circuit and a filtering output circuit, wherein the frequency acquisition circuit 1 and the frequency acquisition circuit 2 respectively acquire the signal frequency in the input end of a signal transmission channel for receiving signals by a control terminal in the intelligent low-temperature grain storage system, the frequency modulation and amplitude modulation circuit divides the signals into two paths of signals by using a delay circuit consisting of a triode Q1, a resistor R5 and a capacitor C2, the filtering output circuit outputs the signals after filtering by using a filter circuit consisting of an inductor L2, a capacitor C13 and a capacitor C14, namely the signal calibration circuit is a compensation signal of the signals in the input end of the signal transmission channel for receiving signals by the control terminal in the intelligent low-temperature grain storage system, and can automatically modulate and calibrate the frequency of the signals in the signal transmission channel for receiving signals by the control terminal, preventing signal distortion.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a signal calibration circuit of an intelligent low-temperature grain storage system.
Background
Store up grain work and human quality of life's optimization and improvement have very close relation, along with the continuous development of science and technology, people's standard of living constantly improves, the safety control of grain has proposed higher requirement, with modern electronic technology, computer control realizes modernized grain storage technology, wherein intelligent low temperature stores up grain system is the key development direction at present, the managerial efficiency of storing up grain work has been improved, however, in the practical application, the control terminal receives the signal in the signal transmission passageway for the signal in the grain system is stored up to intelligent low temperature and the frequency hopping often appears in the transmission course, decay phenomenon, and then lead to signal distortion, make intelligent low temperature store up grain system control terminal send the error instruction, seriously influence intelligent low temperature and store up grain system and use widely.
The present invention provides a new solution to this problem.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a signal calibration circuit for an intelligent low-temperature grain storage system, which has the characteristics of ingenious design and humanized design, and can automatically perform frequency modulation calibration on signals in a signal transmission channel for receiving signals by a control terminal in the intelligent low-temperature grain storage system, so as to prevent signal distortion.
The technical scheme includes that the signal calibration circuit of the intelligent low-temperature grain storage system comprises a frequency acquisition circuit 1, a frequency acquisition circuit 2, a frequency modulation and amplitude modulation circuit and a filtering output circuit, wherein the frequency acquisition circuit 1 and the frequency acquisition circuit 2 respectively acquire signal frequency in an input end of a signal transmission channel for receiving signals by a control terminal in the intelligent low-temperature grain storage system, the signal transmission channel is an analog signal channel for receiving signals by the control terminal in the intelligent low-temperature grain storage system, the frequency acquisition circuit 1 clamps the signals within 0 to +5V by using a clamping circuit consisting of a diode D2 and a diode D3 and inputs the signals into the frequency modulation and amplitude modulation circuit, the frequency modulation and amplitude modulation circuit divides the signals into two paths of signals by using a triode Q1, a resistor R5 and a capacitor C2, and one path of the frequency modulation and amplitude modulation circuit consists of an operational amplifier AR1, an operational amplifier AR2 and a variable resistor R7 and stabilizes the amplitude modulation of the signals, two paths of signals form a constant current source circuit stabilized signal potential by using a triode Q2, a triode Q3 and a capacitor C5, the last two paths of signals pass through a frequency selection circuit formed by a resistor R18-a resistor R20 and a capacitor C6-a capacitor C8 to screen out a signal with single frequency, and the signal is input into a filter output circuit after a push-pull circuit formed by a triode Q6 and a triode Q7 is used for stabilizing the static working point of the signal, wherein a switch circuit formed by a triode Q4 and a triode Q5 is used for detecting the output signal potential of the frequency selection circuit, an output signal of a frequency acquisition circuit 2 passes through a thyristor VTL1, a capacitor C11 and a resistor R17 to form a composite circuit for detecting abnormal signals which are the base potential of a triode Q4 and a base of a triode Q5, the output signal of the frequency selection circuit and the potential difference of the frequency acquisition circuit 2 are used for controlling the conduction of the triode Q4 and, The capacitor C14 forms a filter circuit to filter and output, namely a compensation signal of a signal in the input end of a signal transmission channel for receiving a signal by a control terminal in the intelligent low-temperature grain storage system;
the FM/AM circuit comprises an operational amplifier AR1, the inverting input end of the operational amplifier AR1 is connected with one end of a resistor R1 and one end of a variable resistor R1, the other end of the resistor R1 is connected with the other end of the resistor R1, one end of a capacitor C1 and the collector of a triode Q1, the other end of the resistor R1 and the non-inverting input end of the operational amplifier AR1 are grounded, the output end of the operational amplifier AR1 is connected with the other end of the variable resistor R1 and one end of the capacitor C1, the other end of the capacitor C1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the non-inverting input end of the operational amplifier AR1, the inverting input end of the operational amplifier AR1 is connected with one end of the resistor R1 and one end of the resistor R1, the other end of the resistor R1, the other end of the base of the capacitor Q1 is connected with the emitter of the resistor R1, and one end of the emitter of the triode Q1, the other ends of the resistor R6 and the capacitor C2 are grounded, the other end of the capacitor C4 is connected with the resistor R13, the resistor R14 and one end of the capacitor C5, the other end of the resistor R13 is connected with the anode of the diode D4, the cathode of the diode D4 is connected with the base of the triode Q2 and the collector of the triode Q3, the other end of the resistor R4 is connected with the emitter of the triode Q2, the collector of the triode Q2 is connected with the base of the triode Q3, the emitter of the triode Q4 and the other end of the capacitor C5, the cathode of the regulator D5, the emitter of the triode Q3 is connected with the other end of the resistor R15, the other end of the resistor R18 is connected with the resistor R19 and one end of the capacitor C7, the other end of the capacitor C6 is connected with the resistor R20, one end of the capacitor C8, the collector of the triode Q4, the emitter of the triode Q5, the resistor R5 and the cathode of the triode Q5, the base of the diode Q5 and the regulator D5, the negative electrode of the diode D12, the negative electrode of the diode D11 are connected with the positive electrode of the diode D12 and the collector of the triode Q5, the base of the triode Q5 is connected with the base of the triode Q4, the collector of the triode Q6 is connected with the power supply +5V, the emitter of the triode Q6 is connected with the emitter of the triode Q7, the collector of the triode Q7 is connected with one end of the variable resistor R21, and the other end of the variable resistor R21 is grounded.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages;
1, a time delay circuit consisting of a triode Q1, a resistor R5 and a capacitor C2 is used for dividing a signal into two paths of signals, the property of the time delay circuit is used for delaying the signal flowing into a constant current source circuit from a frequency acquisition circuit 1, the signal is equivalently divided into two paths of signals with the same frequency and different amplitudes, an amplitude modulation circuit consisting of an operational amplifier AR1, an operational amplifier AR2 and a variable resistor R7 is used for modulating and stabilizing the amplitude of the signal, the resistance value of a variable resistor R7 is adjusted to adjust the potential of the signal output by the operational amplifier AR1, a constant current source circuit consisting of a triode Q2, a triode Q3 and a capacitor C5 is used for stabilizing the potential of the signal, a voltage stabilizing tube D5 stabilizes the base potential of a collector of the triode Q2 and a triode Q3, and the collector potential of the triode Q3 is stabilized;
2. stabilizing the static working point of the signal by using a push-pull circuit composed of a triode Q6 and a triode Q7, inputting the signal into a filter output circuit, in order to further detect the amplitude of the output signal of the frequency selection circuit, limiting the potential of the output signal of the frequency selection circuit by using a limiting circuit composed of a diode D11 and a diode D12 to prevent the output signal from exceeding the detection range of a switch circuit composed of a triode Q4 and a triode Q5, judging whether the amplitude of the output signal of the frequency selection circuit is abnormal and overlarge by using the switching conduction properties of a triode Q4 and a triode Q5, in order to further ensure the accuracy of detecting the abnormal signal, simultaneously using a composite circuit detection signal composed of the output signal of a frequency acquisition circuit 2, a controllable silicon VTL1, a capacitor C11 and a resistor R17, and judging the abnormal signal by using the potential difference of the output signal of the frequency acquisition circuit 2 and the output signal, the feedback signal is fed back to the base electrode of the triode Q3, the amplitude of the output signal of the frequency selection circuit is reduced, otherwise, the triode Q4 and the triode Q5 are not conducted, the automatic calibration of the signal is realized, and the signal distortion is prevented.
Drawings
Fig. 1 is a block diagram of a signal calibration circuit of an intelligent low-temperature grain storage system according to the invention.
Fig. 2 is a schematic diagram of a signal calibration circuit of an intelligent low-temperature grain storage system according to the invention.
Fig. 3 is a schematic diagram of a frequency modulation and amplitude modulation circuit in the signal calibration circuit of the intelligent low-temperature grain storage system.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 3. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
The embodiment I provides a signal calibration circuit of an intelligent low-temperature grain storage system, which comprises a frequency acquisition circuit 1, a frequency acquisition circuit 2, a frequency modulation and amplitude modulation circuit and a filtering output circuit, wherein the frequency acquisition circuit 1 and the frequency acquisition circuit 2 respectively acquire the signal frequency in the input end of a signal transmission channel for receiving signals by a control terminal in the intelligent low-temperature grain storage system, the signal transmission channel is an analog signal channel for receiving the signal acquisition by the control terminal in the intelligent low-temperature grain storage system, the frequency acquisition circuit 1 clamps the signals within 0 to +5V by using a clamping circuit consisting of a diode D2 and a diode D3 and inputs the signals into the frequency modulation and amplitude modulation circuit, the frequency modulation and amplitude modulation circuit divides the signals into two paths of signals by using a triode Q1, a resistor R5 and a capacitor C2, one path of the frequency modulation and amplitude modulation circuit consists of an operational amplifier AR1, an operational amplifier AR2 and a variable resistor R7 and regulates and stabilizes the amplitude, two paths of signals form a constant current source circuit stabilized signal potential by using a triode Q2, a triode Q3 and a capacitor C5, the last two paths of signals pass through a frequency selection circuit formed by a resistor R18-a resistor R20 and a capacitor C6-a capacitor C8 to screen out a signal with single frequency, and the signal is input into a filter output circuit after a push-pull circuit formed by a triode Q6 and a triode Q7 is used for stabilizing the static working point of the signal, wherein a switch circuit formed by a triode Q4 and a triode Q5 is used for detecting the output signal potential of the frequency selection circuit, an output signal of a frequency acquisition circuit 2 passes through a thyristor VTL1, a capacitor C11 and a resistor R17 to form a composite circuit for detecting abnormal signals which are the base potential of a triode Q4 and a base of a triode Q5, the output signal of the frequency selection circuit and the potential difference of the frequency acquisition circuit 2 are used for controlling the conduction of the triode Q4 and, The capacitor C14 forms a filter circuit to filter and output, namely a compensation signal of a signal in the input end of a signal transmission channel for receiving a signal by a control terminal in the intelligent low-temperature grain storage system;
the frequency modulation and amplitude modulation circuit uses a time delay circuit consisting of a triode Q1, a resistor R5 and a capacitor C2 to divide a signal into two paths of signals, the property of the time delay circuit is utilized to delay the signal flowing into the constant current source circuit from the frequency acquisition circuit 1, the time delay circuit is equivalent to divide the signal into two paths of signals with the same frequency and different amplitudes, one path of the signal uses an amplitude modulation circuit consisting of an operational amplifier AR1, an operational amplifier AR2 and a variable resistor R7 to carry out amplitude modulation and voltage stabilization on the signal, the resistance value of the variable resistor R7 can be adjusted to adjust the potential of the signal output by the operational amplifier AR1, the other path of the signal uses a triode Q2, a triode Q3 and a capacitor C5 to form the constant current source circuit to stabilize the signal potential, a voltage regulator D5 stabilizes the collector potential of the triode Q2 and the base potential of the triode Q3 to stabilize the collector potential of the triode Q3 to realize the effect of constant current output signals, and finally the signal is screened out by a, ensuring the consistency of signal frequency, preventing the signal frequency from being abnormal, making the compensation signal frequency and the source signal inconsistent, stabilizing the signal static working point by using a push-pull circuit composed of a triode Q6 and a triode Q7, inputting the signal static working point into a filter output circuit, limiting the output signal potential of the frequency selection circuit by using a limiting circuit composed of a diode D11 and a diode D12 in order to further detect the amplitude of the output signal of the frequency selection circuit, preventing the output signal potential from exceeding the detection range of a switch circuit composed of a triode Q4 and a triode Q5, judging whether the amplitude of the output signal of the frequency selection circuit is abnormal and overlarge by using the switch conduction properties of a triode Q4 and a triode Q5, in order to further ensure the accuracy of detecting the abnormal signal, simultaneously using a composite circuit detection signal composed of the output signal of a frequency acquisition circuit 2 and a thyristor VTL1, a capacitor C11 and a resistor R17, judging the abnormal signal by using the potential difference of the output signal of the frequency acquisition circuit 2, if so, feeding back a signal to the base electrode of the triode Q3 to reduce the amplitude of the output signal of the frequency selection circuit, otherwise, the triode Q4 and the triode Q5 are not conducted to realize the automatic calibration of the signal;
the frequency modulation and amplitude modulation circuit has the specific structure that the inverting input end of an operational amplifier AR1 is connected with one end of a resistor R3 and one end of a variable resistor R7, the other end of the resistor R3 is connected with one end of a resistor R3, one end of a capacitor C3 and a collector of a triode Q3, the other end of the resistor R3 is grounded with the non-inverting input end of the operational amplifier AR3, the output end of the operational amplifier AR3 is connected with the other end of the variable resistor R3 and one end of the capacitor C3, the other end of the capacitor C3 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the non-inverting input end of the operational amplifier AR3, the inverting input end of the operational amplifier AR3 is connected with one end of the resistor R3 and one end of the capacitor R3, the other end of the output end of the operational amplifier AR3 is connected with the positive electrode of the resistor R3, the emitter of the triode Q3, and the emitter of the capacitor C3 are connected with the emitter of the resistor R3, the other ends of the resistor R6 and the capacitor C2 are grounded, the other end of the capacitor C4 is connected with the resistor R13, the resistor R14 and one end of the capacitor C5, the other end of the resistor R13 is connected with the anode of the diode D4, the cathode of the diode D4 is connected with the base of the triode Q2 and the collector of the triode Q3, the other end of the resistor R4 is connected with the emitter of the triode Q2, the collector of the triode Q2 is connected with the base of the triode Q3, the emitter of the triode Q4 and the other end of the capacitor C5, the cathode of the regulator D5, the emitter of the triode Q3 is connected with the other end of the resistor R15, the other end of the resistor R18 is connected with the resistor R19 and one end of the capacitor C7, the other end of the capacitor C6 is connected with the resistor R20, one end of the capacitor C8, the collector of the triode Q4, the emitter of the triode Q5, the resistor R5 and the cathode of the triode Q5, the base of the diode Q5 and the regulator D5, the negative electrode of the diode D12, the negative electrode of the diode D11 are connected with the positive electrode of the diode D12 and the collector of the triode Q5, the base of the triode Q5 is connected with the base of the triode Q4, the collector of the triode Q6 is connected with the power supply +5V, the emitter of the triode Q6 is connected with the emitter of the triode Q7, the collector of the triode Q7 is connected with one end of the variable resistor R21, and the other end of the variable resistor R21 is grounded.
In the second embodiment, based on the first embodiment, the filter output circuit uses the inductor L2, the capacitor C13 and the capacitor C14 to form the filter circuit, which outputs the filtered signal, that is, the compensation signal of the signal at the input end of the signal transmission channel for the control terminal receiving signal in the intelligent low-temperature grain storage system, prevents the signal attenuation by using the compensation signal, further, the stability of signals is ensured, the non-inverting input end of the operational amplifier AR3 is connected to the emitter of the transistor Q6, the inverting input end of the operational amplifier AR3 is connected to one ends of the resistor R22 and the resistor R23, the other end of the resistor R22 is grounded, the other end of the resistor R23 is connected to the output end of the operational amplifier AR3, one end of the inductor L2, one ends of the resistor R24 and the capacitor C13, the other end of the inductor L2 is connected to one ends of the capacitor C14 and the resistor R25, the other end of the resistor R25 is connected to the signal output port, and the other ends of the resistor R24 and the capacitor C13 and the other.
In a third embodiment, on the basis of the first embodiment, the frequency acquisition circuit 1 and the frequency acquisition circuit 2 respectively acquire the signal frequency at the input end of a signal transmission channel for receiving signals by a control terminal in the intelligent low-temperature grain storage system by using a frequency acquisition device J1 with the model number of SJ-ADC, the signal transmission channel is an analog signal channel for receiving signals by the control terminal in the intelligent low-temperature grain storage system, the frequency acquisition circuit 1 clamps the signals in 0 to +5V by using a clamping circuit composed of a diode D2 and a diode D3 to input the signals into an amplitude modulation circuit, the output signals of the frequency selection circuit and the potential difference of the frequency acquisition circuit 2 control the conduction of a switching circuit composed of a triode Q4 and a triode Q5, the power supply terminal of the frequency acquisition device J1 is connected with a capacitor C1, one end of a resistor R1, the negative electrode of the diode D2 and the ground terminal of the power supply +5V, and the ground terminal, the output end of the frequency collector J1 is connected with a resistor R1, the other end of the capacitor C1 and one end of a resistor R1, the other end of the resistor R1 is connected with the negative electrode of a voltage regulator tube D1, the positive electrode of a diode D1, the negative electrode of the diode D1 and the collector of a triode Q1, the positive electrode of the voltage regulator tube D1 is grounded, the positive electrode of the diode D1 is grounded, the power supply of the frequency collector J1 is connected with the negative electrodes of the capacitor C1, the resistor R1 and the diode D1 and a power supply +5V, the ground end of the frequency collector J1 is grounded, the output end of the frequency collector J1 is connected with the negative electrodes of the resistor R1, the capacitor C1 and one end of the resistor R1, the negative electrode of the resistor R1 is connected with the negative electrode of the voltage regulator tube D1, the negative electrode of the diode D1 and the positive electrode of the thyristor VTL1, the positive electrode of the thyristor VTR 1 is connected with the positive electrode of the thyristor VTR 1, the thyristor VTR 1 and the negative electrode, One end of the capacitor C11, the other ends of the resistor R17 and the capacitor C11 are grounded, the other end of the resistor R16 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is connected with the base of the triode Q4.
The invention relates to a signal calibration circuit of an intelligent low-temperature grain storage system, which comprises a frequency acquisition circuit 1, a frequency acquisition circuit 2, a frequency modulation and amplitude modulation circuit and a filter output circuit, wherein the frequency acquisition circuit 1 and the frequency acquisition circuit 2 respectively acquire the signal frequency in the input end of a signal transmission channel for receiving signals by a control terminal in the intelligent low-temperature grain storage system, the signal transmission channel is an analog signal channel for receiving signals by the control terminal in the intelligent low-temperature grain storage system, the frequency acquisition circuit 1 uses a clamping circuit consisting of a diode D2 and a diode D3 to clamp signals within 0 to +5V and input the signals into the frequency modulation and amplitude modulation circuit, the frequency modulation and amplitude modulation circuit uses a triode Q1, a resistor R5 and a capacitor C2 to form a delay circuit to divide the signals into two paths, and the signal flowing into a constant current source circuit from the frequency acquisition circuit 1 is delayed by the property of the delay circuit, the signal is divided into two paths of signals with the same frequency and different amplitudes, one path of signals is subjected to amplitude modulation voltage stabilization by an amplitude modulation circuit consisting of an operational amplifier AR1, an operational amplifier AR2 and a variable resistor R7, the potential of the output signal of the operational amplifier AR1 can be adjusted by adjusting the resistance value of a variable resistor R7, the other path of signals is subjected to constant current source circuit stabilization signal potential consisting of a triode Q2, a triode Q3 and a capacitor C5, a voltage stabilizing tube D5 stabilizes the collector potential of a triode Q2 and the base potential of a triode Q3 to stabilize the collector potential of a triode Q3 to realize the effect of constant current output signals, finally the two paths of signals are subjected to frequency selection circuit consisting of a resistor R18-resistor R20 and a capacitor C6-capacitor C8 to screen out signals with single frequency, the consistency of the signal frequency is ensured, the signal frequency is prevented from being abnormal, the compensation signal frequency is inconsistent with the source signal frequency, and the static push-pull point of the signal stabilization circuit consisting of the triode, in order to further detect the amplitude of the output signal of the frequency selection circuit, a limiting circuit consisting of a diode D11 and a diode D12 is firstly used for limiting the potential of the output signal of the frequency selection circuit, the detection range of a switch circuit consisting of a triode Q4 and a triode Q5 is prevented from being exceeded, the switching conduction properties of a triode Q4 and a triode Q5 are utilized for judging whether the amplitude of the output signal of the frequency selection circuit is abnormal and overlarge, in order to further ensure the accuracy of detecting the abnormal signal, a composite circuit detection signal consisting of the output signal of a frequency acquisition circuit 2, a silicon controlled rectifier VTL1, a capacitor C11 and a resistor R17 is simultaneously used for judging the abnormal signal by utilizing the potential difference of the output signal of the frequency acquisition circuit 2 and the output signal of the frequency selection circuit and the conduction potential of the switch circuit, namely, a signal is fed back to the base electrode of the triode Q3 to reduce the amplitude of the output signal of, the automatic calibration of the signals is realized, and the filter output circuit utilizes the inductor L2, the capacitor C13 and the capacitor C14 to form a filter circuit which outputs after filtering, namely a compensation signal of the signals in the input end of the signal transmission channel for receiving the signals by the control terminal in the intelligent low-temperature grain storage system.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (3)
1. A signal calibration circuit of an intelligent low-temperature grain storage system comprises a frequency acquisition circuit 1, a frequency acquisition circuit 2, a frequency modulation and amplitude modulation circuit and a filtering output circuit, and is characterized in that the frequency acquisition circuit 1 and the frequency acquisition circuit 2 respectively acquire the signal frequency in the input end of a signal transmission channel for receiving signals by a control terminal in the intelligent low-temperature grain storage system, the signal transmission channel is an analog signal channel for receiving the signal acquisition circuit by the control terminal in the intelligent low-temperature grain storage system, the frequency acquisition circuit 1 clamps the signals within 0 to +5V by using a clamping circuit consisting of a diode D2 and a diode D3 and inputs the signals into the frequency modulation and amplitude modulation circuit, the frequency modulation and amplitude modulation circuit divides the signals into two paths of signals by using a triode Q1, a resistor R5 and a capacitor C2, one path of the frequency modulation and amplitude modulation circuit mainly consists of an operational amplifier AR1, an operational amplifier AR2 and a variable resistor R7 and modulates the amplitude of the signals, two paths of signals form a constant current source circuit stabilized signal potential by using a triode Q2, a triode Q3 and a capacitor C5, the last two paths of signals pass through a frequency selection circuit formed by a resistor R18-a resistor R20 and a capacitor C6-a capacitor C8 to screen out a signal with single frequency, a push-pull circuit formed by a triode Q6 and a triode Q7 is used for stabilizing a signal static working point and then is input into a filter output circuit, wherein a switch circuit formed by a triode Q4 and a triode Q5 is used for detecting the signal potential output by the frequency selection circuit, a signal output by a frequency acquisition circuit 2 passes through a thyristor VTL1, a capacitor C11 and a resistor R17 to form a composite circuit detection signal, the detected signal is used as the base potential of the triode Q4 and the triode Q5, the signal output by the frequency selection circuit and the potential difference of the frequency acquisition circuit 2 to control the conduction of the switch circuit formed by the triode Q4 and the triode Q5, the capacitor C14 forms a filter circuit to filter and output, namely a compensation signal of a signal in the input end of a signal transmission channel for receiving a signal by a control terminal in the intelligent low-temperature grain storage system;
the FM/AM circuit comprises an operational amplifier AR1, the inverting input end of the operational amplifier AR1 is connected with one end of a resistor R1 and one end of a variable resistor R1, the other end of the resistor R1 is connected with the other end of the resistor R1, one end of a capacitor C1 and the collector of a triode Q1, the other end of the resistor R1 and the non-inverting input end of the operational amplifier AR1 are grounded, the output end of the operational amplifier AR1 is connected with the other end of the variable resistor R1 and one end of the capacitor C1, the other end of the capacitor C1 is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the non-inverting input end of the operational amplifier AR1, the inverting input end of the operational amplifier AR1 is connected with one end of the resistor R1 and one end of the resistor R1, the other end of the resistor R1, the other end of the base of the capacitor Q1 is connected with the emitter of the resistor R1, and one end of the emitter of the triode Q1, the other ends of the resistor R6 and the capacitor C2 are grounded, the other end of the capacitor C4 is connected with the resistor R13, the resistor R14 and one end of the capacitor C5, the other end of the resistor R13 is connected with the anode of the diode D4, the cathode of the diode D4 is connected with the base of the triode Q2 and the collector of the triode Q3, the other end of the resistor R4 is connected with the emitter of the triode Q2, the collector of the triode Q2 is connected with the base of the triode Q3, the emitter of the triode Q4 and the other end of the capacitor C5, the cathode of the regulator D5, the emitter of the triode Q3 is connected with the other end of the resistor R15, the other end of the resistor R18 is connected with the resistor R19 and one end of the capacitor C7, the other end of the capacitor C6 is connected with the resistor R20, one end of the capacitor C8, the collector of the triode Q4, the emitter of the triode Q5, the resistor R5 and the cathode of the triode Q5, the base of the diode Q5 and the regulator D5, the negative electrode of the diode D12, the negative electrode of the diode D11 are connected with the positive electrode of the diode D12 and the collector of the triode Q5, the base of the triode Q5 is connected with the base of the triode Q4, the collector of the triode Q6 is connected with the power supply +5V, the emitter of the triode Q6 is connected with the emitter of the triode Q7, the collector of the triode Q7 is connected with one end of the variable resistor R21, and the other end of the variable resistor R21 is grounded.
2. The signal calibration circuit of the intelligent low-temperature grain storage system as claimed in claim 1, wherein the filter output circuit comprises an operational amplifier AR3, the non-inverting input terminal of the operational amplifier AR3 is connected to the emitter of a triode Q6, the inverting input terminal of the operational amplifier AR3 is connected to one end of a resistor R22 and one end of a resistor R23, the other end of the resistor R22 is grounded, the other end of the resistor R23 is connected to the output terminal of the operational amplifier AR3 and one end of an inductor L2 as well as one end of a resistor R24 and a capacitor C13, the other end of the inductor L2 is connected to one end of a capacitor C14 and a resistor R25, the other end of the resistor R25 is connected to a signal output port, and the other end of the resistor R24 and the capacitor C13 and the.
3. The signal calibration circuit of the intelligent low-temperature grain storage system as claimed in claim 1, wherein the frequency acquisition circuit 1 comprises a frequency collector J1 with the model number of SJ-ADC, a power supply of the frequency collector J1 is connected with one end of a capacitor C1, one end of a resistor R1, the cathode of a diode D2 and a power supply of +5V, the grounding end of a frequency collector J1 is grounded, the output end of the frequency collector J1 is connected with the other end of a resistor R1, the other end of the capacitor C1 and one end of a resistor R2, the other end of the resistor R2 is connected with the cathode of a voltage regulator D1, the anode of the diode D2, the cathode of a diode D3 and the collector of a triode Q1, the anode of the voltage regulator D1 is grounded, and the anode of the diode D3 is;
the frequency acquisition circuit 2 comprises a frequency collector J2 with the model of SJ-ADC, a power supply of the frequency collector J2 is connected with a capacitor C9, one end of a resistor R11, the cathode of a diode D7 and a power supply +5V, the grounding end of the frequency collector J2 is grounded, the output end of the frequency collector J1 is connected with the other end of the resistor R11, the other end of the capacitor C9 and one end of a resistor R12, the other end of the resistor R12 is connected with the cathode of a voltage regulator tube D8, the anode of the diode D7, the cathode of a diode D9, the anode of a thyristor VTL1 and the cathode of a voltage regulator tube D10, the anode of the voltage regulator tube D8 is grounded, the anode of the diode D9 is, the negative electrode of the controlled silicon VTL1 is connected with one end of a resistor R16, the control electrode of the controlled silicon VTL1 is connected with the positive electrode of a voltage regulator tube D10 and one end of a resistor R17 and a capacitor C11, the other ends of the resistor R17 and the capacitor C11 are grounded, the other end of the resistor R16 is connected with one end of a capacitor C12, and the other end of the capacitor C12 is connected with the base electrode of a triode Q4.
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| CN110161348B (en) * | 2019-06-26 | 2020-03-31 | 郑州工程技术学院 | New energy automobile fault detection system |
| CN110244678B (en) * | 2019-06-27 | 2020-05-05 | 河南鑫安利消防安全评价有限公司 | Industrial building fire safety assessment system |
| CN110460796B (en) * | 2019-08-30 | 2021-04-27 | 中瑞恒（北京）科技有限公司 | Industrial equipment operation monitoring signal regulating circuit |
| CN110658805B (en) * | 2019-09-30 | 2020-12-01 | 天津市盛丹电子技术发展有限公司 | Signal calibration circuit of industrial building fire-fighting system |
| CN111245456B (en) * | 2020-03-01 | 2020-10-02 | 北京瞭望神州科技有限公司 | Service management system based on big data |
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