CN107357216B - Rail-mounted multi-channel digital transmitter - Google Patents
Rail-mounted multi-channel digital transmitter Download PDFInfo
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- CN107357216B CN107357216B CN201710743307.4A CN201710743307A CN107357216B CN 107357216 B CN107357216 B CN 107357216B CN 201710743307 A CN201710743307 A CN 201710743307A CN 107357216 B CN107357216 B CN 107357216B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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- G05B2219/21024—Analog output
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Abstract
The invention discloses a track type multi-channel digital transmitter, which comprises a variable power input unit, a power voltage stabilizing unit, a signal filtering unit, an AD conversion unit, a singlechip control unit, an analog quantity signal amplification unit and an analog quantity current conversion unit, wherein the variable power input unit and the power voltage stabilizing unit are sequentially connected; the power input ends of the AD conversion unit, the single chip microcomputer control unit, the analog quantity signal amplification unit and the analog quantity current conversion unit are respectively connected with the power output end corresponding to the power voltage stabilization unit. The invention has strong anti-interference capability, good universality and replaceability and wide adjustment range, and can meet the requirements of different customers.
Description
Technical Field
The invention relates to the field of transmitters, in particular to a track type multichannel digital transmitter.
Background
Traditional rail mounted changer can only be in single output voltage or current signal under fixed condition, when meetting complicated, abominable environment, the normal amplifier often can not gather accurate signal because factors such as high frequency interference, power supply fluctuation, when inserting many sensors simultaneously, output signal will send the change.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a track type multi-channel digital transmitter which has strong anti-interference capability, good universality and replaceability and wide adjustment range and can meet the requirements of different customers.
The technical scheme of the invention is as follows: a track type multi-channel digital transmitter comprises a variable power supply input unit, a power supply voltage stabilizing unit, a signal filtering unit, an AD conversion unit, a single chip microcomputer control unit, an analog quantity signal amplification unit and an analog quantity current conversion unit which are connected in sequence; the power input ends of the AD conversion unit, the singlechip control unit, the analog quantity signal amplification unit and the analog quantity current conversion unit are respectively connected with the power output end corresponding to the power voltage stabilization unit; the AD conversion unit comprises a four-channel 24-bit analog converter U2, wherein a pin 7 and a pin 20 of the four-channel 24-bit analog converter U2 are analog power supply input ends, a pin 17 of the four-channel analog converter U is a digital power supply input end, pins 1, 2, 23, 24, 21, 22, 3 and 4 of the four-channel analog converter U are four-channel analog signal input ends respectively, and pins 13, 14 and 15 of the four-channel analog converter U are digital signal output ends; the single chip microcomputer control unit comprises a single chip microcomputer U1 with the model of STC12C5A16AD, pins 1, 2 and 3 of the single chip microcomputer U1 are digital signal input ends and are connected with digital signal output ends of a four-channel 24-bit analog converter U2 in a one-to-one correspondence mode, pins 23, 24 and 25 of the single chip microcomputer U are digital signal output ends, and pins 12 and 13 of the four-channel 24-bit analog converter U2 are respectively connected with a calibration switch K1 and a calibration switch K2; the analog quantity signal amplification unit comprises a digital-to-analog converter U3 and an integrated amplifier U4, the digital signal output end of the single chip microcomputer U1 is connected with the digital signal input end of the digital-to-analog converter U3, and the analog signal output end of the digital-to-analog converter U3 is connected with the positive input end of the integrated amplifier U4; the analog quantity current conversion unit comprises an integrated amplifier U5, a resistor R28, a resistor R21 and an NPN type triode Q1, wherein the reverse input end of the integrated amplifier U5 and one end of the resistor R28 are connected with the output end of the integrated amplifier U4, the base electrode of the NPN type triode Q1 is connected with the output end of the integrated amplifier U5, the emitting electrode of the NPN type triode Q1 is connected with one end of the resistor R21, and the other end of the resistor R28 and the other end of the resistor R21 are connected with a current signal output end.
The power input unit comprises a DC/DC voltage reduction chip U8, a diode D3, a voltage stabilizing diode D4, an electrolytic capacitor E6, an electrolytic capacitor E7, a capacitor C44, a capacitor C43, a capacitor C16, an inductor L1, a resistor R31 and a resistor R9, wherein the anode of the diode D3 is connected with the power input end, the anode of the electrolytic capacitor E6, one end of the capacitor C44 and input end pins 7 and 8 of the DC/DC voltage reduction chip U8 are all connected with the cathode of the diode D3, the anode of the voltage stabilizing diode D4 and one end of the inductor L1 are all connected with output end pins 1 and 2 of the DC/DC voltage reduction chip U8, one end of the resistor R31, one end of the capacitor C43, the anode of the electrolytic capacitor E7 and one end of the capacitor C16 are all connected with the other end of the inductor L1, one end of the capacitor C16 is used as the output end of the power input unit, one end of the resistor R9, the other end of the resistor R31 and the other end of the capacitor C43 are all connected with the voltage feedback end pin 4 of the DC/DC voltage reduction chip U8, the cathode of the electrolytic capacitor E6, the other end of the capacitor C44, the pins 5,6,3 and 9 of the DC/DC voltage reduction chip U8, the cathode of the voltage stabilizing diode D4, the other end of the resistor R9, the cathode of the electrolytic capacitor E7 and the other end of the capacitor C16 are all grounded.
The power supply voltage stabilizing unit comprises a digital analog power supply voltage stabilizing unit, an analog voltage stabilizing unit and an analog adjusting power supply voltage stabilizing unit; the digital analog power supply voltage stabilizing unit comprises a voltage stabilizer U9 with the model number of 78L05, a capacitor C45, a capacitor C40, an electrolytic capacitor E5, an electrolytic capacitor E12, a capacitor C41, a capacitor C17, a capacitor C18, a capacitor C54, a capacitor C55, a capacitor C56 and a magnetic bead FB2, wherein an input end pin 3 of the voltage stabilizer U9, one end of the capacitor C45, one end of the capacitor C40 and the positive electrode of the electrolytic capacitor E5 are all connected with an output end of the power supply input unit, the positive electrode of the electrolytic capacitor E12, one end of the capacitor C41, one end of the capacitor C17 and one end of the magnetic bead FB2 are all connected with an output end pin 1 of the voltage stabilizer U9 to serve as an output end of a +5V power supply, one end of the capacitor C18, one end of the capacitor C54, one end of the capacitor C55 and one end of the capacitor C56 are all connected with the other end of the magnetic bead FB2 to serve as an output end of a VCC5VD power supply, a grounding end pin 2 of the other end pin 2 of the capacitor C45, the other end of the capacitor C40, the negative electrode of the electrolytic capacitor E5, the electrolytic capacitor E12, the other end of the capacitor C41, the capacitor C18, the other end of the capacitor C17 and the other capacitor C18 of the capacitor C55 are all grounded; the analog voltage stabilizing unit comprises a voltage stabilizer U10 with the model number of LP2981AIM5-5.0, an electrolytic capacitor E9, a capacitor C46, a capacitor C47, a capacitor C48, an electrolytic capacitor E13 and a capacitor C36, wherein an input end pin 1 of the voltage stabilizer U10, an anode of the electrolytic capacitor E9 and one end of the capacitor C46 are connected with an output end of the power input unit, a cathode of the electrolytic capacitor E9 and the other end of the capacitor C46 are connected with a grounding end pin 2 of the voltage stabilizer U10, one end of the capacitor C48, the anode of the electrolytic capacitor E13 and one end of the capacitor C36 are connected with a voltage stabilizing output end pin 5 of the voltage stabilizer U10 to serve as an output end of an analog power supply VA +, one end of the capacitor C47 is connected with a bypass output end pin 4 of the voltage stabilizer U10, and the other end of the capacitor C47, the other end of the capacitor C48, the cathode of the electrolytic capacitor E13 and the other end of the capacitor C36 are all grounded; the analog adjustment power supply voltage stabilizing unit comprises a reference voltage source chip U6 with the model number of ADR3412, a capacitor C38, a capacitor C9 and a capacitor C10, wherein an input end pin 4 of the reference voltage source chip U6, one end of the capacitor C38 and one end of the capacitor C9 are all connected with an output end of the VCC5VD power supply, one end of the capacitor C10 is connected with output end pins 5 and 6 of the reference voltage source chip U6 to serve as an output end of a DAC _ VREF power supply, a grounding end of the reference voltage source chip U6, the other end of the capacitor C38, the other end of the capacitor C9 and the other end of the capacitor C10 are all grounded; an analog power supply input end VA + of the four-channel 24-bit analog converter U2 is connected with an output end of an analog power supply VA + of the analog voltage stabilizing unit, a digital power supply input end VD + of the four-channel 24-bit analog converter U2 is connected with an output end of a digital analog power supply voltage stabilizing unit VCC5VD power supply through an AD filter circuit, the AD filter circuit comprises a resistor R18, a capacitor C52 and a capacitor C34, one end of the resistor R18 is connected with an output end of the digital analog power supply voltage stabilizing unit VCC5VD power supply, one end of the capacitor C52, one end of the capacitor C34 and the other end of the resistor R18 are connected with a digital power supply input end VD + of the four-channel 24-bit analog converter U2, and the other end of the capacitor C52 and the other end of the capacitor C34 are grounded; the power supply input end of the singlechip U1 is connected with the output end of a VCC5VD power supply of the digital analog power supply voltage stabilizing unit; and the power supply input end of the digital-to-analog converter U3 is respectively connected with the output end of a digital-to-analog power supply voltage stabilizing unit VCC5VD power supply and the output end of an analog regulation power supply voltage stabilizing unit DAC _ VREF power supply.
The output end of the digital analog power supply voltage stabilizing unit +5V power supply supplies power to an integrated amplifier U4 of an analog quantity signal amplifying unit and an integrated amplifier U5 of an analog quantity current converting unit after passing through a polarity reversing unit, the polarity reversing unit comprises a power supply polarity converter U11, a capacitor C51, a capacitor C50, an electrolytic capacitor E10, an electrolytic capacitor E11, a capacitor C19, an input end pin 8 of the power supply polarity converter U11, one end of the capacitor C51 and one end of the capacitor C50 which are all connected with the output end of the +5V power supply, the anode of the electrolytic capacitor E10 is connected with an energy storage capacitor anode pin 2 of the power supply polarity converter U11, the cathode of the electrolytic capacitor E10 is connected with an energy storage capacitor cathode pin 4 of the power supply polarity converter U11, the cathode of the electrolytic capacitor E11 and one end of the capacitor C19 are both connected with an output end pin 5 of the power supply polarity converter U11 to serve as the output end of the-5V power supply, the other end of the capacitor C51, the other end of the capacitor C50, the anode of the electrolytic capacitor E11 and the other end of the capacitor C19 are all grounded, and the analog quantity signal amplifying unit output end of the analog quantity signal amplifying unit U4 and the integrated amplifier U5V power supply.
The signal filtering unit comprises four groups of low-pass filtering circuits, the input end of each group of low-pass filtering circuits is connected with the corresponding sensor, and the output end of each group of low-pass filtering circuits is connected with the corresponding four-channel analog signal input end of the four-channel 24-bit analog converter U2.
The invention has the advantages that:
(1) The whole transmitter adopts a high-performance wide-voltage power supply chip, so that the transmitter can realize lossless output in a power supply range of 15-36V;
(2) The power supply part of the invention carries out voltage stabilization regulation through different voltage stabilization units, ensures that the output voltage conforms to the use of various devices and is more stable, and protects a post-stage circuit;
(3) The whole circuit of the invention adopts accurate design, adopts anti-interference devices mostly and has strong anti-interference capability.
(4) The invention utilizes the singlechip to calibrate the output analog quantity and can respectively monitor the service conditions of the four sensors.
The invention has the advantages of good universality and replaceability, wide adjustment range, simple structure, stable performance, low production cost and easy batch production, and can meet the requirements of different customers.
Drawings
Fig. 1 is a block diagram of the present invention, wherein "- -" is a power flow direction and "-" is a signal flow direction.
Fig. 2 is a circuit diagram of the power input unit of the present invention.
Fig. 3 is a circuit diagram of the voltage stabilizing unit of the digital-analog power supply of the invention.
Fig. 4 is a circuit diagram of the analog voltage stabilization unit of the present invention.
Fig. 5 is a circuit diagram of an analog regulated power supply voltage regulation unit of the present invention.
Fig. 6 is a circuit diagram of a polarity reversing unit of the present invention.
FIG. 7 is a signal of the present invention circuit diagram of a filtering unit.
Fig. 8 is a circuit diagram of an AD conversion unit of the present invention.
Fig. 9 is a circuit diagram of the single chip microcomputer control unit of the present invention.
Fig. 10 is a circuit diagram of an analog quantity signal amplifying unit of the present invention.
Fig. 11 is a circuit diagram of an analog current converting unit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a track type multi-channel digital transmitter comprises a variable power input unit 1, a power voltage stabilizing unit 2, a signal filtering unit 4, an AD conversion unit 5, a single chip microcomputer control unit 6, an analog quantity signal amplification unit 7, an analog quantity current conversion unit 8 and a polarity reversing unit 3, which are connected in sequence; the power input ends of the AD conversion unit 5, the singlechip control unit 6 and the analog quantity signal amplification unit 7 digital-to-analog converter U3 are respectively connected with the power output ends corresponding to the power voltage stabilization unit 2, the output end of the power voltage stabilization unit 2 supplies power to the integrated amplifier U4 of the analog quantity signal amplification unit 7 and the integrated amplifier U5 of the analog quantity current conversion unit 8 after passing through the polarity inversion unit 3, and the inverted voltage generated by the polarity inversion unit supplies power to increase the amplification capacity of the amplification chip;
referring to fig. 2, the power input unit 1 includes a DC/DC buck chip U8 with a model number SX3002, a diode D3, a zener diode D4, an electrolytic capacitor E6, an electrolytic capacitor E7, a capacitor C44, a capacitor C43, a capacitor C16, an inductor L1, a resistor R31, and a resistor R9, an anode of the diode D3 is connected to the power input terminal, an anode of the electrolytic capacitor E6, one end of the capacitor C44, and input pins 7 and 8 of the DC/DC buck chip U8 are all connected to a cathode of the diode D3, an anode of the zener diode D4 and one end of the inductor L1 are both connected to output pins 1 and 2 of the DC/DC buck chip U8, one end of the resistor R31, one end of the capacitor C43, the anode of the electrolytic capacitor E7 and one end of the capacitor C16 are all connected with the other end of the inductor L1, one end of the capacitor C16 is used as the output end of the power input unit, one end of the resistor R9, the other end of the resistor R31 and the other end of the capacitor C43 are all connected with the voltage feedback end pin 4 of the DC/DC voltage reduction chip U8, the cathode of the electrolytic capacitor E6, the other end of the capacitor C44, the pins 5,6,3 and 9 of the DC/DC voltage reduction chip U8, the cathode of the voltage stabilizing diode D4, the other end of the resistor R9, the cathode of the electrolytic capacitor E7 and the other end of the capacitor C16 are all grounded.
When the power supply voltage of the transmitter changes within the range of 15-36V, the DC/DC voltage reduction chip U8, the resistor R31 and the resistor R9 are matched with a 15uH inductor L1 and a plurality of capacitors to carry out primary voltage stabilization on an input power supply, and a stable voltage with strong anti-interference capability and high output efficiency is output. The output magnitude changes according to the resistance value changes of R1 and R2. The primary voltage stabilization result is (1 + R31/R9) × 1.235V. Under normal conditions, the pressure is adjusted within 8-12V.
Because the voltage obtained by the primary voltage stabilization of the power supply is too large, the amplifier, the sensor and other devices are inconvenient to be directly connected, so that the analog voltage of the sensor and the digital voltage of the singlechip must be separated after voltage stabilization while voltage stabilization is carried out for two or three times; the power supply voltage stabilizing unit 2 comprises a digital analog power supply voltage stabilizing unit, an analog voltage stabilizing unit and an analog regulation power supply voltage stabilizing unit;
referring to fig. 3, the digital analog power supply voltage stabilizing unit includes a voltage stabilizer U9 with a model number of 78L05, a capacitor C45, a capacitor C40, an electrolytic capacitor E5, an electrolytic capacitor E12, a capacitor C41, a capacitor C17, a capacitor C18, a capacitor C54, a capacitor C55, a capacitor C56, and a magnetic bead FB2, wherein an input terminal pin 3 of the voltage stabilizer U9, one end of the capacitor C45, one end of the capacitor C40, and a positive electrode of the electrolytic capacitor E5 are all connected to an output terminal of the power supply input unit, a positive electrode of the electrolytic capacitor E12, one end of the capacitor C41, one end of the capacitor C17, and one end of the magnetic bead FB2 are all connected to an output terminal pin 1 of the voltage stabilizer U9 as an output terminal of a +5V power supply, one end of the capacitor C18, one end of the capacitor C54, one end of the capacitor C55, one end of the capacitor C56 are all connected to the other end of the magnetic bead FB2 as an output terminal of a VCC5V power supply, a ground terminal pin 2 of the other terminal of the capacitor U9, the other end of the capacitor C45, the other end of the capacitor C40, a negative electrode of the electrolytic capacitor E5, a negative electrode of the capacitor E12, the capacitor C41, the other end of the capacitor C17, the capacitor C18, the capacitor C17, the capacitor C55, the other end of the capacitor C18, the capacitor C17, and the capacitor C55 are all grounded;
referring to fig. 4, the analog voltage stabilizing unit includes a voltage stabilizer U10 with model number LP2981AIM5-5.0, an electrolytic capacitor E9, a capacitor C46, a capacitor C47, a capacitor C48, an electrolytic capacitor E13 and a capacitor C36, an input terminal pin 1 of the voltage stabilizer U10, an anode of the electrolytic capacitor E9 and one end of the capacitor C46 are all connected with an output terminal of the power input unit, a cathode of the electrolytic capacitor E9 and the other end of the capacitor C46 are connected with a ground terminal pin 2 of the voltage stabilizer U10, one end of the capacitor C48, the anode of the electrolytic capacitor E13 and one end of the capacitor C36 are all connected with a voltage stabilizing output terminal pin 5 of the voltage stabilizer U10 to serve as an output terminal of an analog power supply VA +, one end of the capacitor C47 is connected with a bypass output terminal pin 4 of the voltage stabilizer U10, and the other end of the capacitor C47, the other end of the capacitor C48, the cathode of the electrolytic capacitor E13 and the other end of the capacitor C36 are all grounded;
referring to fig. 5, the analog adjustment power supply voltage stabilization unit includes a reference voltage source chip U6 with model number ADR3412, a capacitor C38, a capacitor C9 and a capacitor C10, an input terminal pin 4 of the reference voltage source chip U6, one end of the capacitor C38 and one end of the capacitor C9 are all connected to the output terminal of the VCC5VD power supply, one end of the capacitor C10 is connected to output terminal pins 5 and 6 of the reference voltage source chip U6 as the output terminal of the DAC _ VREF power supply, the ground terminal of the reference voltage source chip U6, the other end of the capacitor C38, the other end of the capacitor C9 and the other end of the capacitor C10 are all grounded;
referring to fig. 6, the polarity reversing unit 3 includes a power polarity converter U11 with a model number of ICL7660 or ICL7662, a capacitor C51, a capacitor C50, an electrolytic capacitor E10, an electrolytic capacitor E11 and a capacitor C19, an input terminal pin 8 of the power polarity converter U11, one end of the capacitor C51, and one end of the capacitor C50 are all connected to the output terminal of the +5V power supply, the positive electrode of the electrolytic capacitor E10 is connected to the positive electrode pin 2 of the energy storage capacitor of the power polarity converter U11, the negative electrode of the electrolytic capacitor E10 is connected to the negative electrode pin 4 of the energy storage capacitor of the power polarity converter U11, the negative electrode of the electrolytic capacitor E11 and one end of the capacitor C19 are both connected to the output terminal pin 5 of the power polarity converter U11 as the output terminal of the-5V power supply, and the other end of the capacitor C51, the other end of the capacitor C50, the positive electrode of the electrolytic capacitor E11 and the other end of the capacitor C19 are both grounded;
referring to fig. 7, the signal filtering unit 4 includes four groups of low-pass filter circuits, an input end of each group of low-pass filter circuits is connected to a corresponding sensor, and an output end of each group of low-pass filter circuits is connected to a four-channel analog signal input end corresponding to the four-channel 24-bit analog converter U2; the low-pass filter circuit filters out high-frequency signals of 6MHz or above, and the anti-interference capacity of the amplifier is enhanced.
Referring to fig. 8, the AD conversion unit 5 includes a four-channel 24-bit analog converter U2 with a model CS5534, a pin 7 and a pin 20 of the four-channel 24-bit analog converter U2 are analog power input terminals VA +, the pin is connected to an output terminal of an analog power VA + of the analog voltage stabilizing unit, a pin 17-bit digital power input terminal of the four-channel 24-bit analog converter U2 is connected to an output terminal of a digital voltage stabilizing unit VCC5VD power through an AD filter circuit, the AD filter circuit includes a resistor R18, a capacitor C52 and a capacitor C34, one end of the resistor R18 is connected to an output terminal of the digital voltage stabilizing unit VCC5VD power, one end of the capacitor C52, one end of the capacitor C34, and the other end of the resistor R18 are all connected to a digital power input terminal VD + of the four-channel 24-bit analog converter U2, the other end of the capacitor C52 and the other end of the capacitor C34 are grounded, pins 1, 2, 23, 24, 21, 22, 3 and 4 of the four-channel 24-bit analog converter U2 are four-channel analog signal input terminals, corresponding to four groups of low-pass analog signal input terminals VD, and four-pass analog converters U2 are connected to four-channel analog signal output terminals 24, 14 and four-bit analog signal output terminals 14;
referring to fig. 9, the single chip microcomputer control unit 6 includes a single chip microcomputer U1 with a model of STC12C5a16AD, pins 1, 2, and 3 of the single chip microcomputer U1 are digital signal input ends and are connected with digital signal output ends of a four-channel 24-bit analog converter U2 in a one-to-one correspondence manner, pins 23, 24, and 25 of the single chip microcomputer U1 are digital signal output ends, pins 12 and 13 of the four-channel 24-bit analog converter U2 are respectively connected with a calibration switch K1 and a calibration switch K2, and a power supply input end of the single chip microcomputer U1 is connected with an output end of a VCC5VD power supply of a digital analog power supply voltage stabilizing unit VCC;
the single-chip microcomputer U1 with the model of STC12C5A16AD is a single-clock/machine period (1T) single-chip microcomputer produced by macro-crystal technology, is a new generation 8051 single-chip microcomputer with high speed, low power consumption and ultra-strong interference, and has instruction codes completely compatible with the conventional 8051 but 8-12 times faster. The special reset circuit for MAX810 is integrated inside, 2-path PWM and 8-path high speed 10 are A/D conversion (250K/S), and the special reset circuit aims at motor control and strong interference occasions.
Referring to fig. 10, the analog quantity signal amplification unit 7 includes a digital-to-analog converter U3 with model number DAC8551A and an integrated amplifier U4 with model number OP07, the digital signal output end of the single chip microcomputer U1 is connected with the digital signal input end of the digital-to-analog converter U3, the analog signal output end of the digital-to-analog converter U3 is connected with the forward input end of the integrated amplifier U4, the digital power input end of the digital-to-analog converter U3 is connected with the output end of the digital-to-analog power voltage stabilizing unit VCC5VD power supply, the analog power input end of the digital-to-analog converter U3 is connected with the output end of the analog adjustment power voltage stabilizing unit DAC _ VREF power supply, and the output end of the polarity reversing unit-5V power supply supplies reverse polarity power to the integrated amplifier U4;
referring to fig. 11, the analog-to-digital current conversion unit 8 includes an integrated amplifier U5 with the model number of OP07, a resistor R28, a resistor R21, and an NPN-type transistor Q1, where an inverting input terminal of the integrated amplifier U5 and one end of the resistor R28 are both connected to an output terminal of the integrated amplifier U4, a base of the NPN-type transistor Q1 is connected to an output terminal of the integrated amplifier U5, an emitter of the NPN-type transistor Q1 is connected to one end of the resistor R21, the other end of the resistor R28 and the other end of the resistor R21 are both connected to a current signal output terminal, and an output terminal of a polarity inverting unit-5V power supply supplies power to the integrated amplifier U5 in a reverse polarity manner.
The voltage at the signal input port OUT1 of the integrated amplifier U5 is adjusted to 0.2V to 1.0V, and then according to the characteristic of current amplification, the current output is IOUT = (OUT 1-GND) × (1/R28 + 1/R21), since R28 is 25K, when it is far greater than 1,1/25K, it is considered as 0,iout =out1/50. The voltage at the signal input port OUT1 of U5 is conventionally adjusted to 0.2V to 1.0V, and then divided by 50, and the output of the integrated amplifier U5 is a current signal of 4 to 20 mA.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A rail-mounted multichannel digital transmitter is characterized in that: the device comprises a variable power input unit, a power voltage stabilizing unit, a signal filtering unit, an AD conversion unit, a single chip microcomputer control unit, an analog quantity signal amplification unit and an analog quantity current conversion unit which are connected in sequence; the power input ends of the AD conversion unit, the singlechip control unit, the analog quantity signal amplification unit and the analog quantity current conversion unit are respectively connected with the power output end corresponding to the power voltage stabilization unit; the AD conversion unit comprises a four-channel 24-bit analog converter U2, wherein a pin 7 and a pin 20 of the four-channel 24-bit analog converter U2 are analog power supply input ends, a pin 17 of the four-channel analog converter U is a digital power supply input end, pins 1, 2, 23, 24, 21, 22, 3 and 4 of the four-channel analog converter U are four-channel analog signal input ends respectively, and pins 13, 14 and 15 of the four-channel analog converter U are digital signal output ends; the single chip microcomputer control unit comprises a single chip microcomputer U1 with the model of STC12C5A16AD, pins 1, 2 and 3 of the single chip microcomputer U1 are digital signal input ends and are connected with digital signal output ends of a four-channel 24-bit analog converter U2 in a one-to-one correspondence mode, pins 23, 24 and 25 of the single chip microcomputer U are digital signal output ends, and pins 12 and 13 of the four-channel 24-bit analog converter U2 are respectively connected with a calibration switch K1 and a calibration switch K2; the analog quantity signal amplification unit comprises a digital-to-analog converter U3 and an integrated amplifier U4, the digital signal output end of the single chip microcomputer U1 is connected with the digital signal input end of the digital-to-analog converter U3, and the analog signal output end of the digital-to-analog converter U3 is connected with the positive input end of the integrated amplifier U4; the analog quantity current conversion unit comprises an integrated amplifier U5, a resistor R28, a resistor R21 and an NPN type triode Q1, wherein the reverse input end of the integrated amplifier U5 and one end of the resistor R28 are connected with the output end of the integrated amplifier U4, the base electrode of the NPN type triode Q1 is connected with the output end of the integrated amplifier U5, the emitting electrode of the NPN type triode Q1 is connected with one end of the resistor R21, and the other end of the resistor R28 and the other end of the resistor R21 are connected with a current signal output end.
2. The orbital multi-channel digital transmitter of claim 1, wherein: the power input unit comprises a DC/DC voltage reduction chip U8, a diode D3, a voltage stabilizing diode D4, an electrolytic capacitor E6, an electrolytic capacitor E7, a capacitor C44, a capacitor C43, a capacitor C16, an inductor L1, a resistor R31 and a resistor R9, wherein the anode of the diode D3 is connected with the power input end, the anode of the electrolytic capacitor E6, one end of the capacitor C44 and input end pins 7 and 8 of the DC/DC voltage reduction chip U8 are all connected with the cathode of the diode D3, the anode of the voltage stabilizing diode D4 and one end of the inductor L1 are all connected with output end pins 1 and 2 of the DC/DC voltage reduction chip U8, one end of the resistor R31, one end of the capacitor C43, the anode of the electrolytic capacitor E7 and one end of the capacitor C16 are all connected with the other end of the inductor L1, one end of the capacitor C16 is used as the output end of the power input unit, one end of the resistor R9, the other end of the resistor R31 and the other end of the capacitor C43 are all connected with the voltage feedback end pin 4 of the DC/DC voltage reduction chip U8, the cathode of the electrolytic capacitor E6, the other end of the capacitor C44, the pins 5,6,3 and 9 of the DC/DC voltage reduction chip U8, the cathode of the voltage stabilizing diode D4, the other end of the resistor R9, the cathode of the electrolytic capacitor E7 and the other end of the capacitor C16 are all grounded; when the power supply voltage of the transmitter changes within the range of 15-36V, the DC/DC voltage reduction chip U8, the resistor R31 and the resistor R9 are matched with a 15uH inductor L1 and a plurality of capacitors to stabilize the voltage of an input power supply at one time, and a stable voltage with strong anti-interference capability and high output efficiency is output.
3. The orbital multi-channel digital transmitter of claim 1, wherein: the power supply voltage stabilizing unit comprises a digital analog power supply voltage stabilizing unit, an analog voltage stabilizing unit and an analog adjusting power supply voltage stabilizing unit; the digital analog power supply voltage stabilizing unit comprises a voltage stabilizer U9 with the model number of 78L05, a capacitor C45, a capacitor C40, an electrolytic capacitor E5, an electrolytic capacitor E12, a capacitor C41, a capacitor C17, a capacitor C18, a capacitor C54, a capacitor C55, a capacitor C56 and a magnetic bead FB2, wherein an input end pin 3 of the voltage stabilizer U9, one end of the capacitor C45, one end of the capacitor C40 and the positive electrode of the electrolytic capacitor E5 are all connected with an output end of the power supply input unit, the positive electrode of the electrolytic capacitor E12, one end of the capacitor C41, one end of the capacitor C17 and one end of the magnetic bead FB2 are all connected with an output end pin 1 of the voltage stabilizer U9 to serve as an output end of a +5V power supply, one end of the capacitor C18, one end of the capacitor C54, one end of the capacitor C55 and one end of the capacitor C56 are all connected with the other end of the magnetic bead FB2 to serve as an output end of a VCC5VD power supply, a grounding end pin 2 of the other end pin 2 of the capacitor C45, the other end of the capacitor C40, the negative electrode of the electrolytic capacitor E5, the electrolytic capacitor E12, the other end of the capacitor C41, the capacitor C18, the other end of the capacitor C17 and the other capacitor C18 of the capacitor C55 are all grounded; the analog voltage stabilizing unit comprises a voltage stabilizer U10 with the model number of LP2981AIM5-5.0, an electrolytic capacitor E9, a capacitor C46, a capacitor C47, a capacitor C48, an electrolytic capacitor E13 and a capacitor C36, wherein an input end pin 1 of the voltage stabilizer U10, an anode of the electrolytic capacitor E9 and one end of the capacitor C46 are connected with an output end of the power input unit, a cathode of the electrolytic capacitor E9 and the other end of the capacitor C46 are connected with a grounding end pin 2 of the voltage stabilizer U10, one end of the capacitor C48, the anode of the electrolytic capacitor E13 and one end of the capacitor C36 are connected with a voltage stabilizing output end pin 5 of the voltage stabilizer U10 to serve as an output end of an analog power supply VA +, one end of the capacitor C47 is connected with a bypass output end pin 4 of the voltage stabilizer U10, and the other end of the capacitor C47, the other end of the capacitor C48, the cathode of the electrolytic capacitor E13 and the other end of the capacitor C36 are all grounded; the analog adjustment power supply voltage stabilizing unit comprises a reference voltage source chip U6 with the model number of ADR3412, a capacitor C38, a capacitor C9 and a capacitor C10, wherein an input end pin 4 of the reference voltage source chip U6, one end of the capacitor C38 and one end of the capacitor C9 are all connected with an output end of the VCC5VD power supply, one end of the capacitor C10 is connected with output end pins 5 and 6 of the reference voltage source chip U6 to serve as an output end of a DAC _ VREF power supply, a grounding end of the reference voltage source chip U6, the other end of the capacitor C38, the other end of the capacitor C9 and the other end of the capacitor C10 are all grounded; an analog power supply input end VA + of the four-channel 24-bit analog converter U2 is connected with an output end of an analog power supply VA + of the analog voltage stabilizing unit, a digital power supply input end VD + of the four-channel 24-bit analog converter U2 is connected with an output end of a digital analog power supply voltage stabilizing unit VCC5VD power supply through an AD filter circuit, the AD filter circuit comprises a resistor R18, a capacitor C52 and a capacitor C34, one end of the resistor R18 is connected with an output end of the digital analog power supply voltage stabilizing unit VCC5VD power supply, one end of the capacitor C52, one end of the capacitor C34 and the other end of the resistor R18 are connected with a digital power supply input end VD + of the four-channel 24-bit analog converter U2, and the other end of the capacitor C52 and the other end of the capacitor C34 are grounded; the power supply input end of the single chip microcomputer U1 is connected with the output end of a digital analog power supply voltage stabilizing unit VCC5VD power supply; and the power supply input end of the digital-to-analog converter U3 is respectively connected with the output end of a digital-to-analog power supply voltage stabilizing unit VCC5VD power supply and the output end of an analog regulation power supply voltage stabilizing unit DAC _ VREF power supply.
4. The orbital multi-channel digital transmitter of claim 3 wherein: the output end of the digital analog power supply voltage stabilizing unit +5V power supply supplies power to an integrated amplifier U4 of the analog quantity signal amplifying unit and an integrated amplifier U5 of the analog quantity current conversion unit after passing through the polarity reversing unit, and the reverse-phase voltage generated by the polarity reversing unit supplies power to increase the amplifying capacity of the amplifying chip; the polarity reversing unit comprises a power polarity converter U11, a capacitor C51, a capacitor C50, an electrolytic capacitor E10, an electrolytic capacitor E11, a capacitor C19, an input end pin 8 of the power polarity converter U11, one end of the capacitor C51 and one end of the capacitor C50 are all connected with the output end of the +5V power supply, the anode of the electrolytic capacitor E10 is connected with an energy storage capacitor anode pin 2 of the power polarity converter U11, the cathode of the electrolytic capacitor E10 is connected with an energy storage capacitor cathode pin 4 of the power polarity converter U11, the cathode of the electrolytic capacitor E11 and one end of the capacitor C19 are both connected with an output end pin 5 of the power polarity converter U11 to serve as the output end of the-5V power supply, the other end of the capacitor C51, the other end of the capacitor C50, the anode of the electrolytic capacitor E11 and the other end of the capacitor C19 are all grounded, and the output end of the-5V power supply with the integrated amplifier U4 of the analog quantity signal amplifying unit and the integrated amplifier U5 of the analog quantity current converting unit in a reverse polarity mode respectively.
5. The orbital multi-channel digital transmitter of claim 1, wherein: the signal filtering unit comprises four groups of low-pass filtering circuits, the input end of each group of low-pass filtering circuits is connected with the corresponding sensor, and the output end of each group of low-pass filtering circuits is connected with the corresponding four-channel analog signal input end of the four-channel 24-bit analog converter U2.
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| CN201710743307.4A CN107357216B (en) | 2017-08-25 | 2017-08-25 | Rail-mounted multi-channel digital transmitter |
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| CN201710743307.4A CN107357216B (en) | 2017-08-25 | 2017-08-25 | Rail-mounted multi-channel digital transmitter |
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| CN107357216B true CN107357216B (en) | 2023-02-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02249311A (en) * | 1988-12-08 | 1990-10-05 | Yokogawa Electric Corp | High speed ad converter |
| CN106370915A (en) * | 2016-09-30 | 2017-02-01 | 蚌埠天光传感器有限公司 | Novel general three-wire system and four-wire system-switchable transmitter |
-
2017
- 2017-08-25 CN CN201710743307.4A patent/CN107357216B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02249311A (en) * | 1988-12-08 | 1990-10-05 | Yokogawa Electric Corp | High speed ad converter |
| CN106370915A (en) * | 2016-09-30 | 2017-02-01 | 蚌埠天光传感器有限公司 | Novel general three-wire system and four-wire system-switchable transmitter |
Non-Patent Citations (1)
| Title |
|---|
| 基于单片机控制的数控电源设计;胡辉等;《商丘职业技术学院学报》;20131026(第05期);全文 * |
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