CN110542788A - composite current frequency sensor - Google Patents
composite current frequency sensor Download PDFInfo
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- CN110542788A CN110542788A CN201910900236.3A CN201910900236A CN110542788A CN 110542788 A CN110542788 A CN 110542788A CN 201910900236 A CN201910900236 A CN 201910900236A CN 110542788 A CN110542788 A CN 110542788A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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Abstract
The invention relates to a composite current frequency sensor, comprising: the single chip microcomputer module is used for calculating the electric signal detected by the sensor through fast Fourier transform to obtain a current value and a frequency value, converting the electric signal into an analog signal through an internal DAC and outputting the analog signal to the signal amplification module; the signal acquisition module is used for conditioning and amplifying the signals of the Hall element; the signal amplification module is used for amplifying and outputting the DAC analog quantity output by the singlechip module; the power supply module is used for providing a power supply for the singlechip module and converting input power supply voltage into power supply voltage required by the singlechip module; according to the invention, the waveform collected by the Hall element is calculated by adopting fast Fourier transform, and the measurement current and the frequency thereof can be calculated simultaneously; the invention adopts a closed loop structure of Hall effect, and has the characteristics of high precision and good following property; the invention adopts the internal glue filling and sealing treatment, and has the characteristics of high IP protection level and good insulation property.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a composite current frequency sensor.
Background
With the development of science and technology, the productivity level is continuously improved, electric energy is widely applied to daily production and life as a clean energy, a closed-loop or magnetic balance type Hall current sensor is used as a novel tool for detecting current, and the popularization rate in the industry is gradually increased by virtue of the superior performance and the access-free detection mode.
The closed loop type or magnetic balance type Hall current sensor is a sensor which converts primary large current into secondary tiny voltage signals by utilizing Hall effect, and has the characteristics of wide measurement range, good electrical isolation performance, high measurement precision, good linearity, strong interference resistance to external electromagnetic and temperature factors and the like, high current rise rate, high response speed, strong overload capacity, simple and convenient installation and the like, thereby being widely applied to the aspects of industrial automation technology, detection technology, information processing and the like.
however, the current hall current sensors on the market can only collect current data, and in many complex engineering applications, the current frequency is also a key parameter, and the same hall current sensor cannot measure the current and the frequency at the same time. In the traditional measuring scheme, two sensors are used for measuring current and frequency respectively, so that the space utilization rate is lower, and the measuring steps are more complicated.
Disclosure of Invention
the invention aims to provide a composite current frequency sensor which can simultaneously measure current and current frequency, so that the integration and precision degree of a measurement product is higher, and the space utilization rate is higher and more efficient in engineering application.
in order to achieve the purpose, the invention adopts the following technical scheme: a composite current frequency sensor comprising:
the single chip microcomputer module is used for calculating the electric signal detected by the sensor through fast Fourier transform to obtain a current value and a frequency value, converting the electric signal into an analog signal through an internal DAC and outputting the analog signal to the signal amplification module;
The signal acquisition module is used for conditioning and amplifying the signals of the Hall element;
The signal amplification module is used for amplifying and outputting the DAC analog quantity output by the singlechip module;
The power supply module is used for providing a power supply for the singlechip module and converting input power supply voltage into power supply voltage required by the singlechip module;
The output end of the signal acquisition module is connected with the input end of the single chip microcomputer module, the output end of the single chip microcomputer module is connected with the input end of the signal amplification module, and the power supply module supplies power to the single chip microcomputer module, the signal acquisition module and the signal amplification module respectively.
The signal acquisition module comprises a magnetic core, a secondary compensation coil, a Hall element, a resistor R19, a resistor R20, an operational amplifier U1, a triode Q3, a triode Q4 and a measuring resistor Rm, wherein the secondary compensation coil is wound on the magnetic core, the Hall element is arranged at the notch of the magnetic core, the output end of the Hall element is respectively connected with one end of a resistor R19 and one end of a resistor R20, the other ends of the resistor R19 and the resistor R20 are respectively connected with two input ends of the operational amplifier U1, the output end of the operational amplifier U1 is respectively connected with the base of a triode Q3 and the base of the triode Q4, the base of a triode Q3 is simultaneously connected with one end of the secondary compensation coil, the collector of the triode Q3 is connected with the positive pole Vc + of a 12V external input power supply, the emitter of the triode Q3 is connected with the collector of a triode Q4, the emitter of the triode Q4 is connected with the negative pole Vc-Vc, the other end of the measuring resistor Rm is grounded, and the voltage obtained by multiplying the current sensed by the Hall element by the resistance value of the measuring resistor Rm is used as the output voltage Vout of the signal acquisition module.
the single chip microcomputer module comprises a single chip microcomputer chip STM2F373CT6, a resistor R1, a resistor R2, a resistor R6, a resistor R17, a resistor R18, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a light emitting diode LED1, one end of the resistor R1 is connected with a 44 pin of the single chip microcomputer chip STM2F373CT6, and the other end of the resistor R1 is grounded; the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are connected in parallel, one end of the parallel end is connected with a +3.3V power supply, and the other end of the parallel end is grounded: one end of the resistor R2 is grounded, the other end of the resistor R2 is connected with the NRST terminal of the reset terminal of the single chip microcomputer chip STM2F373CT6 and one end of the capacitor C5 respectively, and the other end of the capacitor C5 is grounded; one end of the resistor R6 is connected with a pin 41 of the single chip microcomputer chip STM2F373CT6, the other end of the resistor R6 is connected with the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is grounded; one end of the resistor R17 is connected with an output signal Vout of an output end of the signal acquisition module, the other end of the resistor R17 is connected with a PE8 pin of a single chip microcomputer chip STM2F373CT6 and one end of the resistor R18 respectively, the other end of the resistor R18 is grounded, and a PA4 pin and a PA5 pin of a single chip microcomputer chip STM2F373CT6 serve as output ends of the single chip microcomputer module.
The signal amplification module comprises a resistor R3, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C13, a capacitor C14, a triode Q1, a triode Q2, an operational amplifier OP1A and an operational amplifier OP 1B; one end of the capacitor C13 is grounded, the other end of the capacitor C13 is respectively connected with the output end of the single chip microcomputer module and one end of the resistor R7, the other end of the resistor R7 is respectively connected with one end of the resistor R9 and the positive input end of the operational amplifier OP1A, one end of the resistor R4 is grounded, the other end of the resistor R4 is respectively connected with the negative input end of the operational amplifier OP1A and one end of the resistor R3, the other end of the resistor R3 is connected with the emitter of the triode Q1, the other end of the resistor R9 and one end of the resistor R8 are connected with a point A, the point is used as a first output end 1out1 of the signal amplification module, the other end of the resistor R8 is connected with an emitter of the triode Q1, positive and negative pins of a power supply of the operational amplifier OP1A are respectively connected with the positive and negative electrodes of an input power supply, the output end of the operational amplifier OP1A is connected with one end of the resistor R5, the other end of the resistor R5 is connected with a base electrode of the triode Q1, and a collector of the triode Q1 is grounded; one end of the capacitor C14 is grounded, the other end of the capacitor C14 is respectively connected with the output end of the singlechip module and one end of the resistor R13, the other end of the resistor R13 is respectively connected with one end of the resistor R15 and the non-inverting input end of the operational amplifier OP1B, one end of the resistor R11 is grounded, the other end of the resistor R11 is respectively connected with the inverting input end of the operational amplifier OP1B and one end of the resistor R10, the other end of the resistor R10 is connected with the emitter of the triode Q2, the other end of the resistor R15 is connected with one end of the resistor R14 at a point B which is used as the second output end 1out2 of the signal amplification module, the other end of the resistor R14 is connected with the emitter of the triode Q2, the positive and negative pins of the power supply of the operational amplifier OP1B are respectively connected with the positive and negative pins of the input power supply, the output end of the operational amplifier OP1B, the collector of the transistor Q2 is grounded.
The power supply module comprises a fuse F1, a diode D1, a capacitor C8, a capacitor C9, a capacitor C10 and a voltage reduction chip UA78M33, one end of the fuse F1 is connected with a power supply V +, the power supply V + is +12V direct current, the other end of the fuse F1 is connected with the anode of the diode D1, the cathode of the diode D1 is respectively connected with a pin 1 of the voltage reduction chip UA78M33, namely an IN terminal, one end of the capacitor C8, the other end of the capacitor C8 is respectively connected with a pin 2 of the voltage reduction chip UA78M33, namely an AGND terminal, and a pin 4 of the voltage reduction chip UA78M33, and the two ends are connected IN: the 3 pins of the voltage reduction chip UA78M33, namely the output end, are respectively connected with one end of a capacitor C9 and one end of a capacitor C10, and the other ends of the capacitor C9 and the capacitor C10 are connected with the ground in common.
According to the technical scheme, the beneficial effects of the invention are as follows: firstly, the waveform collected by the Hall element is calculated by adopting fast Fourier transform, and the measurement current and the frequency thereof can be calculated simultaneously;
Secondly, the Hall effect closed-loop structure is adopted, and the Hall effect closed-loop structure has the characteristics of high precision and good following property; thirdly, the invention adopts the internal glue filling and sealing treatment, and has the characteristics of high IP protection level and good insulation property; fourthly, the method adopts a threading measurement mode, has an isolation function, and is safer and more convenient; fifthly, the invention adopts a low-power-consumption singlechip mode, so that the overall power consumption is low.
drawings
FIG. 1 is a block circuit diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the signal acquisition module of FIG. 1;
FIG. 3 is a circuit schematic of the die module of FIG. 1;
FIG. 4 is a schematic circuit diagram of the signal amplification block of FIG. 1;
fig. 5 is a circuit schematic diagram of the power module of fig. 1.
Detailed Description
As shown in fig. 1, a composite current frequency sensor includes:
the single chip microcomputer module is used for calculating the electric signal detected by the sensor through fast Fourier transform to obtain a current value and a frequency value, converting the electric signal into an analog signal through an internal DAC and outputting the analog signal to the signal amplification module;
the signal acquisition module is used for conditioning and amplifying the signals of the Hall element 3;
The signal amplification module is used for amplifying and outputting the DAC analog quantity output by the singlechip module;
the power supply module is used for providing a power supply for the singlechip module and converting input power supply voltage into power supply voltage required by the singlechip module;
The output end of the signal acquisition module is connected with the input end of the single chip microcomputer module, the output end of the single chip microcomputer module is connected with the input end of the signal amplification module, and the power supply module supplies power to the single chip microcomputer module, the signal acquisition module and the signal amplification module respectively.
as shown in fig. 2, the signal acquisition module includes a magnetic core 1, a secondary compensation coil 2, a hall element 3, a resistor R19, a resistor R20, an operational amplifier U1, a triode Q3, a triode Q4 and a measurement resistor Rm, the secondary compensation coil 2 is wound on the magnetic core 1, the hall element 3 is disposed at a notch of the magnetic core 1, an output end of the hall element 3 is connected to one end of a resistor R19 and one end of a resistor R20, the other ends of the resistor R19 and the resistor R20 are connected to two input ends of the operational amplifier U1, the operational amplifier U1 adopts a differential operational amplifier AD8276, an output end of the operational amplifier U1 is connected to a base of the triode Q3 and a base of the triode Q4, a base of the triode Q3 is connected to one end of the secondary compensation coil 2 at the same time, a collector of the triode Q3 is connected to a positive terminal of a Vc external input power supply, an emitter of the triode Q3 is connected to a collector of the triode Q4, and a negative terminal of the triode Q4 is connected, the other end of the secondary compensation coil 2 is connected with one end of a measuring resistor Rm, the other end of the measuring resistor Rm is grounded, the voltage obtained by multiplying the current induced by the Hall element 3 by the resistance value of the measuring resistor Rm is used as the output voltage Vout of the signal acquisition module, and the output voltage Vout is directly connected with an AD detection port of a chip STM2F373CT6 of the single chip microcomputer.
as shown in fig. 3, the single chip microcomputer module includes a single chip microcomputer chip STM2F373CT6, a resistor R1, a resistor R2, a resistor R6, a resistor R17, a resistor R18, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a light emitting diode LED1, one end of the resistor R1 is connected to a pin 44 of the single chip microcomputer chip STM2F373CT6, and the other end of the resistor R1 is grounded; the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are connected in parallel, one end of the parallel end is connected with a +3.3V power supply, and the other end of the parallel end is grounded: one end of the resistor R2 is grounded, the other end of the resistor R2 is connected with the NRST terminal of the reset terminal of the single chip microcomputer chip STM2F373CT6 and one end of the capacitor C5 respectively, and the other end of the capacitor C5 is grounded; one end of the resistor R6 is connected with a pin 41 of the single chip microcomputer chip STM2F373CT6, the other end of the resistor R6 is connected with the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is grounded; one end of the resistor R17 is connected with an output signal Vout of an output end of the signal acquisition module, the other end of the resistor R17 is connected with a PE8 pin of a single chip microcomputer chip STM2F373CT6 and one end of the resistor R18 respectively, the other end of the resistor R18 is grounded, and a PA4 pin and a PA5 pin of a single chip microcomputer chip STM2F373CT6 serve as output ends of the single chip microcomputer module.
as shown in fig. 4, the signal amplification module includes a resistor R3, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C13, a capacitor C14, a transistor Q1, a transistor Q2, an operational amplifier OP1A, and an operational amplifier OP 1B; one end of the capacitor C13 is grounded, the other end of the capacitor C13 is respectively connected with the output end of the single chip microcomputer module and one end of the resistor R7, the other end of the resistor R7 is respectively connected with one end of the resistor R9 and the positive input end of the operational amplifier OP1A, one end of the resistor R4 is grounded, the other end of the resistor R4 is respectively connected with the negative input end of the operational amplifier OP1A and one end of the resistor R3, the other end of the resistor R3 is connected with the emitter of the triode Q1, the other end of the resistor R9 and one end of the resistor R8 are connected with a point A, the point is used as a first output end 1out1 of the signal amplification module, the other end of the resistor R8 is connected with an emitter of the triode Q1, positive and negative pins of a power supply of the operational amplifier OP1A are respectively connected with the positive and negative electrodes of an input power supply, the output end of the operational amplifier OP1A is connected with one end of the resistor R5, the other end of the resistor R5 is connected with a base electrode of the triode Q1, and a collector of the triode Q1 is grounded; one end of the capacitor C14 is grounded, the other end of the capacitor C14 is respectively connected with the output end of the singlechip module and one end of the resistor R13, the other end of the resistor R13 is respectively connected with one end of the resistor R15 and the non-inverting input end of the operational amplifier OP1B, one end of the resistor R11 is grounded, the other end of the resistor R11 is respectively connected with the inverting input end of the operational amplifier OP1B and one end of the resistor R10, the other end of the resistor R10 is connected with the emitter of the triode Q2, the other end of the resistor R15 is connected with one end of the resistor R14 at a point B which is used as the second output end 1out2 of the signal amplification module, the other end of the resistor R14 is connected with the emitter of the triode Q2, the positive and negative pins of the power supply of the operational amplifier OP1B are respectively connected with the positive and negative pins of the input power supply, the output end of the operational amplifier OP1B, the collector of the transistor Q2 is grounded.
As shown IN fig. 5, the power module includes a fuse F1, a diode D1, a capacitor C8, a capacitor C9, a capacitor C10, and a buck chip UA78M33, one end of the fuse F1 is connected to a power supply V +, the power supply V + is a +12V direct current, the other end of the fuse F1 is connected to an anode of the diode D1, a cathode of the diode D1 is connected to an IN terminal, which is a pin 1, of the buck chip UA78M33, and one end of the capacitor C8, the other end of the capacitor C8 is connected to an AGND terminal, which is a pin 2, of the buck chip UA78M33, and a pin 4 of the buck chip UA78M33, and is connected to the common ground: the 3 pins of the voltage reduction chip UA78M33, namely the output end, are respectively connected with one end of a capacitor C9 and one end of a capacitor C10, and the other ends of the capacitor C9 and the capacitor C10 are connected with the ground in common.
the invention is further described below with reference to fig. 1 to 5.
As shown in fig. 5, V + is the input end of the power supply, the input voltage is +12V, and flows into the voltage-reducing chip UA78M33 through the fuse F1 and the diode D1, and is reduced to +3.3V through the voltage-reducing chip UA78M33 to supply power to the single chip.
In the signal acquisition module shown in fig. 2, when a current IP passes through the primary side, a magnetic field is excited around the wire, the magnetic core 1 gathers most of the magnetic energy, and the magnetic field is applied to the hall element 3 vertically, so that a weak hall voltage UH is generated. Because the value of the hall voltage is very small, the hall voltage needs to be amplified by the operational amplifier U1 to drive the rear stage triode. Since the switching tube of the latter stage already has a forward voltage between the collector and the transmitter, when the amplified hall voltage IS applied to the base, the switching tube IS turned on, and a compensation current IS obtained from the latter.
This current then passes through the secondary compensation coil 2 with the number of turns NS to generate a magnetic field which is exactly opposite to the magnetic field generated by the current to be measured, thus compensating the original magnetic field and gradually reducing the output voltage UH of the hall element 3. When IS · NS IS equal to IP · NP, IS no longer increased, and the hall element 3 at this time functions to indicate zero magnetic flux, and the size of IP can be measured by the size of IS.
As shown in fig. 3, the measurement principle of the composite current frequency sensor is that the current and the frequency are measured by a hall current sensor. The Hall current sensor is made according to the ampere law principle, and the voltage signal Vout output by the Hall element 3 can indirectly reflect the magnitude of the measured current IP because the magnetic circuit and the output of the Hall device have good linear relation. The Hall current sensor converts a current of-100A into a voltage signal Vout of 0-5V. When the measured object is an alternating current source, the output signal following performance is good, the frequency of a signal source is calculated by using a fast FFT formula, a voltage signal Vout acquired by a signal acquisition module passes through two voltage division resistors R17 and R18 to obtain a new signal IN, the new signal IN is input to a PE8 terminal of a single chip microcomputer STM32F373CCT6, and finally the measured current and frequency values are converted into 2 paths of 4-20mA current signals DAC1 and DAC2 to be output.
As shown in the signal amplification module of fig. 4, the current signals DAC1 and DAC2 output by the single chip microcomputer terminal are amplified by the signal amplification module and then output to the measurement device.
in conclusion, the waveform collected by the Hall element is calculated by adopting fast Fourier transform, and the measurement current and the frequency thereof can be calculated simultaneously; the invention adopts a closed loop structure of Hall effect, and has the characteristics of high precision and good following property; the invention adopts the internal glue filling and sealing treatment, and has the characteristics of high IP protection level and good insulation property; the invention adopts a threading measurement mode for measurement, has the function of isolation and is safer and more convenient; the invention adopts a low-power-consumption singlechip mode, and the whole power consumption is low.
Claims (5)
1. A composite current frequency sensor, characterized by: the method comprises the following steps:
the single chip microcomputer module is used for calculating the electric signal detected by the sensor through fast Fourier transform to obtain a current value and a frequency value, converting the electric signal into an analog signal through an internal DAC and outputting the analog signal to the signal amplification module;
The signal acquisition module is used for conditioning and amplifying the signal of the Hall element (3);
The signal amplification module is used for amplifying and outputting the DAC analog quantity output by the singlechip module;
The power supply module is used for providing a power supply for the singlechip module and converting input power supply voltage into power supply voltage required by the singlechip module;
The output end of the signal acquisition module is connected with the input end of the single chip microcomputer module, the output end of the single chip microcomputer module is connected with the input end of the signal amplification module, and the power supply module supplies power to the single chip microcomputer module, the signal acquisition module and the signal amplification module respectively.
2. The composite current frequency sensor according to claim 1, wherein: the signal acquisition module comprises a magnetic core (1), a secondary compensation coil (2), a Hall element (3), a resistor R19, a resistor R20, an operational amplifier U1, a triode Q3, a triode Q4 and a measuring resistor Rm, wherein the secondary compensation coil (2) is wound on the magnetic core (1), the Hall element (3) is arranged at the notch of the magnetic core (1), the output end of the Hall element (3) is respectively connected with one end of the resistor R19 and one end of the resistor R20, the other ends of the resistor R19 and the resistor R20 are respectively connected with two input ends of the operational amplifier U1, the output end of the operational amplifier U1 is respectively connected with the base of a triode Q3 and the base of the triode Q4, the base of a triode Q3 is simultaneously connected with one end of the secondary compensation coil (2), the collector of the triode Q3 is connected with the positive pole Vc + of a 12V external input power supply, the emitter of the triode Q3 is connected with the collector of the triode Q4, and the emitter of the triode Q4 is connected with the, the other end of the secondary compensation coil (2) is connected with one end of a measuring resistor Rm, the other end of the measuring resistor Rm is grounded, and the voltage obtained by multiplying the current sensed by the Hall element (3) by the resistance value of the measuring resistor Rm is used as the output voltage Vout of the signal acquisition module.
3. the composite current frequency sensor according to claim 1, wherein: the single chip microcomputer module comprises a single chip microcomputer chip STM2F373CT6, a resistor R1, a resistor R2, a resistor R6, a resistor R17, a resistor R18, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a light emitting diode LED1, one end of the resistor R1 is connected with a 44 pin of the single chip microcomputer chip STM2F373CT6, and the other end of the resistor R1 is grounded; the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are connected in parallel, one end of the parallel end is connected with a +3.3V power supply, and the other end of the parallel end is grounded: one end of the resistor R2 is grounded, the other end of the resistor R2 is connected with the NRST terminal of the reset terminal of the single chip microcomputer chip STM2F373CT6 and one end of the capacitor C5 respectively, and the other end of the capacitor C5 is grounded; one end of the resistor R6 is connected with a pin 41 of the single chip microcomputer chip STM2F373CT6, the other end of the resistor R6 is connected with the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is grounded; one end of the resistor R17 is connected with an output signal Vout of an output end of the signal acquisition module, the other end of the resistor R17 is connected with a PE8 pin of a single chip microcomputer chip STM2F373CT6 and one end of the resistor R18 respectively, the other end of the resistor R18 is grounded, and a PA4 pin and a PA5 pin of a single chip microcomputer chip STM2F373CT6 serve as output ends of the single chip microcomputer module.
4. The composite current frequency sensor according to claim 1, wherein: the signal amplification module comprises a resistor R3, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C13, a capacitor C14, a triode Q1, a triode Q2, an operational amplifier OP1A and an operational amplifier OP 1B; one end of the capacitor C13 is grounded, the other end of the capacitor C13 is respectively connected with the output end of the single chip microcomputer module and one end of the resistor R7, the other end of the resistor R7 is respectively connected with one end of the resistor R9 and the positive input end of the operational amplifier OP1A, one end of the resistor R4 is grounded, the other end of the resistor R4 is respectively connected with the negative input end of the operational amplifier OP1A and one end of the resistor R3, the other end of the resistor R3 is connected with the emitter of the triode Q1, the other end of the resistor R9 and one end of the resistor R8 are connected with a point A, the point is used as a first output end 1out1 of the signal amplification module, the other end of the resistor R8 is connected with an emitter of the triode Q1, positive and negative pins of a power supply of the operational amplifier OP1A are respectively connected with the positive and negative electrodes of an input power supply, the output end of the operational amplifier OP1A is connected with one end of the resistor R5, the other end of the resistor R5 is connected with a base electrode of the triode Q1, and a collector of the triode Q1 is grounded; one end of the capacitor C14 is grounded, the other end of the capacitor C14 is respectively connected with the output end of the single chip microcomputer module and one end of the resistor R13, the other end of the resistor R13 is respectively connected with one end of the resistor R15 and the positive input end of the operational amplifier OP1B, one end of the resistor R11 is grounded, the other end of the resistor R11 is respectively connected with the negative input end of the operational amplifier OP1B and one end of the resistor R10, the other end of the resistor R10 is connected with the emitter of the triode Q2, the other end of the resistor R15 and one end of the resistor R14 are connected with a point B, the point is used as a second output end 1out2 of the signal amplification module, the other end of the resistor R14 is connected with an emitter of the triode Q2, positive and negative pins of a power supply of the operational amplifier OP1B are respectively connected with positive and negative electrodes of an input power supply, the output end of the operational amplifier OP1B is connected with one end of the resistor R12, the other end of the resistor R12 is connected with a base electrode of the triode Q2, and a collector of the triode Q2 is grounded.
5. The composite current frequency sensor according to claim 1, wherein: the power supply module comprises a fuse F1, a diode D1, a capacitor C8, a capacitor C9, a capacitor C10 and a voltage reduction chip UA78M33, one end of the fuse F1 is connected with a power supply V +, the power supply V + is +12V direct current, the other end of the fuse F1 is connected with the anode of the diode D1, the cathode of the diode D1 is respectively connected with a pin 1 of the voltage reduction chip UA78M33, namely an IN terminal, one end of the capacitor C8, the other end of the capacitor C8 is respectively connected with a pin 2 of the voltage reduction chip UA78M33, namely an AGND terminal, and a pin 4 of the voltage reduction chip UA78M33, and the two ends are connected IN: the 3 pins of the voltage reduction chip UA78M33, namely the output end, are respectively connected with one end of a capacitor C9 and one end of a capacitor C10, and the other ends of the capacitor C9 and the capacitor C10 are connected with the ground in common.
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| CN115681263A (en) * | 2022-12-29 | 2023-02-03 | 江苏恒立液压科技有限公司 | Circuit structure of electro-hydraulic proportional movement controller and use method thereof |
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