CN105425024A - Differential amplification type constant-current source aluminum electrolysis anode current measuring instrument based on signal conversion - Google Patents

Differential amplification type constant-current source aluminum electrolysis anode current measuring instrument based on signal conversion Download PDF

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CN105425024A
CN105425024A CN201510785836.1A CN201510785836A CN105425024A CN 105425024 A CN105425024 A CN 105425024A CN 201510785836 A CN201510785836 A CN 201510785836A CN 105425024 A CN105425024 A CN 105425024A
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triode
pole
amplifier
electric capacity
diode
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郭力
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Sichuan Huasuo Automation Information Engineering Co Ltd
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Sichuan Huasuo Automation Information Engineering Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a differential amplification type constant-current source aluminum electrolysis anode current measuring instrument based on signal conversion. The instrument is characterized in that the instrument is mainly composed of a central processor, a constant-current source module, a difference amplification module, a display, an analog-to-digital conversion module and a storage module which are connected with the central processor, a voltage acquisition module which is connected with the differential amplification module, and a temperature sensor which is connected with the analog-to-digital conversion module; and the analog-to-digital conversion module is composed of an amplifier P1, an amplifier P2, a triode VT4, a triode VT5, a triode VT6, and a resistor R8 which is connected in series between the positive electrode of the amplifier P1 and the output end. With the instrument, the current of an aluminum electrolysis anode can be detected in real time. The instrument is of high detection efficiency and strong real-time performance, and the labor intensity can be greatly reduced. The analog-to-digital conversion module adopted in the invention is of high signal conversion efficiency, and can help to improve the efficiency of aluminum electrolysis anode current measurement.

Description

Based on the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument of signal conversion
Technical field
The present invention relates to field of aluminum electrolysis, specifically refer to a kind of differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion.
Background technology
Aluminium electroloysis is a complicated electrochemical reaction process, be subject to the coupling of multiple physical fields such as electric field, magnetic field, thermal field, flow field.Anode current is the very important parameter of in Aluminium Electrolysis, and the multiple situation in it and Aluminium Electrolysis has close ties.Therefore, realize aluminium electrolysis anode electric current and measure in real time, the control for aluminium electrolysis process provides reliable data foundation, is of great significance aluminium electrolytic industry tool.At present, aluminium electrolytic industry scene still adopts the method for artificial off-line to measure anode current, uses to measure to pitch and measures equidistant pressure drop, fetch data with the millivolt voltmeter reading of repacking.This traditional detection method inefficiency, data are seriously delayed, and labor strength is large.
Summary of the invention
The object of the invention is to overcome that traditional aluminium electrolysis anode current measuring method efficiency is low, data are delayed and the defect that labour intensity is large, a kind of differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion is provided.
The following technical scheme of object of the present invention realizes: based on the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument of signal conversion, primarily of central processing unit, the constant current source module be connected with central processing unit respectively, differential amplification module, display, analog-to-digital conversion module and memory module, the voltage acquisition module be connected with differential amplification module, and the temperature sensor be connected with analog-to-digital conversion module forms, described analog-to-digital conversion module is by amplifier P1, amplifier P2, triode VT4, triode VT5, triode VT6, be serially connected in the resistance R8 between the positive pole of amplifier P1 and output terminal, positive pole is connected with the negative pole of amplifier P1, the electric capacity C8 of minus earth, be serially connected in the resistance R7 between the positive pole of amplifier P1 and the emitter of triode VT4, N pole is connected with the base stage of triode VT5, the diode D5 that P pole is then connected with the output terminal of amplifier P1, P pole is connected with the collector of triode VT5, the diode D6 that N pole is then connected with the emitter of triode VT5 after electric capacity C9, N pole is connected with the N pole of diode D6, the diode D7 that P pole is then connected with the emitter of triode VT5, be serially connected in the electric capacity C7 between the positive pole of amplifier P2 and output terminal, be serially connected in the resistance R9 between the negative pole of amplifier P2 and the emitter of triode VT6, positive pole is connected with the collector of triode VT4, the electric capacity C6 of ground connection while negative pole is then connected with the negative pole of amplifier P2, and one end is connected with the collector of triode VT6, the resistance R10 that the other end then forms the output terminal of this analog-to-digital conversion module extremely jointly with the N of diode D6 forms, the positive pole of described amplifier P1 and the emitter of triode VT4 form the input end of this analog-to-digital conversion module jointly, the base stage of described triode VT4 is connected with the positive pole of amplifier P2, the base stage of described triode VT6 is connected with the output terminal of amplifier P2, its collector is then connected with the emitter of triode VT5, the input end of described analog-to-digital conversion module is connected with temperature sensor, its output terminal is then connected with central processing unit, described constant current source module is then by front end Transformer Rectifier filtering circuit, the power factor correction circuit be connected with front end Transformer Rectifier filtering circuit, the step-down conversion circuit be connected with power factor correction circuit, the filtering circuit be simultaneously connected with step-down conversion circuit with power factor correction circuit, and the voltage feedback circuit be connected with step-down conversion circuit forms, the output terminal of described filtering circuit is connected with central processing unit, the input termination civil power of front end Transformer Rectifier filtering circuit.
Further, described differential amplification module is by amplifier P3, amplifier P4, field effect transistor MOS1, triode VT7, triode VT8, N pole is connected with the positive pole of amplifier P3 after resistance R11, the voltage stabilizing diode D8 of P pole ground connection, N pole is connected with the positive pole of amplifier P3 after resistance R13, the diode D10 that P pole is then connected with the output terminal of amplifier P4, positive pole is connected with the negative pole of amplifier P3 after resistance R12, the electric capacity C10 that negative pole is then connected with the emitter of triode VT7, N pole is connected with the negative pole of amplifier P4, the diode D9 that P pole is then connected with the collector of triode VT7, positive pole is connected with the source electrode of field effect transistor MOS1, the polar capacitor C11 of minus earth, be serially connected in the electric capacity C12 between the source electrode of field effect transistor MOS1 and the base stage of triode VT8, one end is connected with the collector of triode VT8, the resistance R14 of other end ground connection, and negative pole is connected with the N pole of diode D10, the electric capacity C13 that positive pole then forms the output terminal of this differential amplification module jointly with the output terminal of amplifier P3 forms, the N pole of described voltage stabilizing diode D8 and the positive pole of electric capacity C10 form the input end of this differential amplification module jointly, grounded collector, its base stage of described triode VT7 are then connected with the output terminal of amplifier P4, the grid of described field effect transistor MOS1 is connected with the positive pole of amplifier P4, it drains and be then connected with the negative pole of electric capacity C13, the emitter of described triode VT8 is connected with the output terminal of amplifier P3, the described input end of differential amplification module is connected with the output terminal of voltage acquisition module, its output terminal is then connected with central processing unit.
Described front end Transformer Rectifier filtered electrical routing transformer T, diode rectifier U, the fuse FU that one end is connected with the Same Name of Ends of the telefault on the former limit of transformer T, the other end then forms the input end of this front end Transformer Rectifier filtering circuit jointly with the non-same polarity of the telefault on the former limit of transformer T, and the electric capacity C1 be serially connected between the cathode output end of diode rectifier U and cathode output end forms; An input end of described diode rectifier U is connected with the non-same polarity of the telefault of transformer T secondary, its another input end is then connected with the Same Name of Ends of the telefault of transformer T secondary; The cathode output end of described diode rectifier U is connected with step-down conversion circuit, its cathode output end is then connected with power factor correction circuit.
Described power factor correction circuit is by triode VT1, the electric capacity C2 that positive pole is connected with the cathode output end of diode rectifier U, negative pole is then connected with step-down conversion circuit, be serially connected in the resistance R3 between the negative pole of electric capacity C2 and the base stage of triode VT1, the diode D1 that N pole is connected with the positive pole of electric capacity C2, P pole is then connected with the emitter of triode VT1, and the diode D2 that N pole is connected with the positive pole of electric capacity C2, P pole is then connected with the collector of triode VT1 forms; The positive pole of described electric capacity C2 is also connected with filtering circuit; The collector of described triode VT1 is connected with step-down conversion circuit.
Described step-down conversion circuit by process chip U1, field effect transistor MOS, and the resistance R5 be serially connected between the PWM pin of process chip U1 and the grid of field effect transistor MOS forms; The SW pin of described process chip U1 is connected with the negative pole of electric capacity C2, its VIN pin is then connected with the collector of triode VT1, VDD pin is then connected with filtering circuit, COMP pin is then connected with voltage feedback circuit with the equal ground connection of GND pin, SENSE+ pin, its SENSE-pin is then connected with the cathode output end of diode rectifier U; The drain electrode of described field effect transistor MOS is connected with the VDD pin of process chip U1 with filtering circuit simultaneously, its source electrode is then connected with voltage feedback circuit.
Described filtering circuit is by triode VT2, be serially connected in the resistance R4 between the positive pole of electric capacity C2 and the emitter of triode VT2, the electric capacity C5 that positive pole is connected with the collector of triode VT2, negative pole is then connected with the drain electrode of field effect transistor MOS, and the voltage stabilizing diode D3 that N pole is connected with the positive pole of electric capacity C2, P pole is then connected with the drain electrode of field effect transistor MOS after inductance L 1 forms; The base stage of described triode VT2 is connected with the VDD pin of process chip U1; The N pole of described voltage stabilizing diode D3 and P form the output terminal of this filtering circuit extremely jointly.
Described voltage feedback circuit is by triode VT3, the electric capacity C4 that positive pole is connected with the source electrode of field effect transistor MOS, negative pole is then connected with the emitter of triode VT3, one end is connected with the collector of triode VT3, the resistance R6 of other end ground connection, the polar capacitor C3 that positive pole is connected with the source electrode of field effect transistor MOS, negative pole is then connected with the base stage of triode VT3, and the diode D4 that N pole is connected with the base stage of triode VT3, P pole is then connected with the SENSE+ pin of process chip U1 after resistance R1 through resistance R2 in turn forms.
Described process chip U1 is SD42560 integrated chip.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) what the present invention can be real-time detects the electric current of aluminium electrolysis anode, and its detection efficiency is high, real-time, greatly can reduce labour intensity.
(2) the present invention has temperature compensation function, and it antianode guide rod resistance value can do temperature compensation to eliminate the impact that when aluminium cell works, anode rod temperature antianode guide rod resistance value produces, thus improves measuring accuracy of the present invention.
(3) the present invention adopts constant current source to power, and can improve stability of the present invention.
(4) the present invention is provided with differential amplification module, and it can make the voltage signal that collects more clear, so that central processing unit identifies, avoids central processing unit occur wrong identification and affect measuring accuracy of the present invention.
(5) its signal conversion efficiency of analog-to-digital conversion module of the present invention's employing is high, can improve the measurement efficiency of the present invention to aluminium electrolysis anode electric current.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is the circuit structure diagram of constant current source module of the present invention.
Fig. 3 is the circuit structure diagram of analog-to-digital conversion module of the present invention.
Fig. 4 is the circuit structure diagram of differential amplification module of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion of the present invention, primarily of central processing unit, the constant current source module be connected with central processing unit respectively, differential amplification module, display, analog-to-digital conversion module and memory module, the voltage acquisition module be connected with differential amplification module, and the temperature sensor be connected with analog-to-digital conversion module forms.
Wherein, voltage acquisition module is for gathering the voltage signal on anode rod, differential amplification module can carry out process to the voltage signal collected makes voltage signal more clear, temperature sensor is then for gathering the temperature signal on anode rod, analog-to-digital conversion module is used for temperature signal to be converted to digital electric signal, central processing unit is then as processing enter of the present invention, constant current source module is used for the invention provides constant working current, display is for showing the real-time current value of anode, and memory module is used for the current value measured to store.The LPC1200 series microprocessor that this central processing unit adopts Wei Bochuan Science and Technology Ltd. of Shenzhen to produce.The JCJ100TLB type temperature sensor that temperature sensor then adopts Beijing nine skill Development Co., Ltd of pure Rehabilitation to produce.The VI-12 series voltage acquisition module that voltage acquisition module then adopts Shenzhen Bai Site control technology company limited to produce.Analog-to-digital conversion module, display and memory module then adopt prior art to realize.
During work, voltage acquisition module gathers the voltage signal on anode rod and be transferred to central processing unit after differential amplification resume module, simultaneous temperature sensor then gathers the temperature signal on anode rod, and this temperature signal is converted to digital electric signal by analog-to-digital conversion module and is transferred to central processing unit.This central processing unit carries out digital electric signal to identify and compensates according to the temperature of the temperature antianode resistance detected, sends to display and memory module after calculating concrete current value.
As shown in Figure 2, described constant current source module is then by front end Transformer Rectifier filtering circuit, the power factor correction circuit be connected with front end Transformer Rectifier filtering circuit, the step-down conversion circuit be connected with power factor correction circuit, the filtering circuit be simultaneously connected with step-down conversion circuit with power factor correction circuit, and the voltage feedback circuit be connected with step-down conversion circuit forms; The output terminal of described filtering circuit is connected with central processing unit, the input termination 220V civil power of front end Transformer Rectifier filtering circuit.
Described front end Transformer Rectifier filtering circuit is converted to the smooth-going direct current of 15V 220V electric main and exports.It is by transformer T, diode rectifier U, and fuse FU and electric capacity C1 forms.
During connection, one end of fuse FU is connected with the Same Name of Ends of the telefault on the former limit of transformer T, its other end then forms the input end of this front end Transformer Rectifier filtering circuit jointly with the non-same polarity of the telefault on the former limit of transformer T.Between the cathode output end that electric capacity C1 is then serially connected in diode rectifier U and cathode output end.An input end of described diode rectifier U is connected with the non-same polarity of the telefault of transformer T secondary, its another input end is then connected with the Same Name of Ends of the telefault of transformer T secondary.The cathode output end of described diode rectifier U is connected with step-down conversion circuit, its cathode output end is then connected with power factor correction circuit.
Described power factor correction circuit is by triode VT1, and electric capacity C2, resistance R3, diode D1 and diode D2 form.During connection, the positive pole of electric capacity C2 is connected with the cathode output end of diode rectifier U, its negative pole is then connected with step-down conversion circuit.Resistance R3 is then serially connected between the negative pole of electric capacity C2 and the base stage of triode VT1.The N pole of diode D1 is connected with the positive pole of electric capacity C2, its P pole is then connected with the emitter of triode VT1.The N pole of diode D2 is connected with the positive pole of electric capacity C2, its P pole is then connected with the collector of triode VT1.The positive pole of described electric capacity C2 is also connected with filtering circuit; The collector of described triode VT1 is connected with step-down conversion circuit.
Described step-down conversion circuit by process chip U1, field effect transistor MOS, and the resistance R5 be serially connected between the PWM pin of process chip U1 and the grid of field effect transistor MOS forms.The SW pin of described process chip U1 is connected with the negative pole of electric capacity C2, its VIN pin is then connected with the collector of triode VT1, VDD pin is then connected with filtering circuit, COMP pin is then connected with voltage feedback circuit with the equal ground connection of GND pin, SENSE+ pin, its SENSE-pin is then connected with the cathode output end of diode rectifier U.The drain electrode of described field effect transistor MOS is connected with the VDD pin of process chip U1 with filtering circuit simultaneously, its source electrode is then connected with voltage feedback circuit.In order to reach better implementation result, described process chip U1 is that SD42560 integrated chip realizes.
Described filtering circuit is by triode VT2, and resistance R4, electric capacity C5, inductance L 1 and voltage stabilizing diode D3 form.Wherein, resistance R4 is serially connected between the positive pole of electric capacity C2 and the emitter of triode VT2.The positive pole of electric capacity C5 is connected with the collector of triode VT2, its negative pole is then connected with the drain electrode of field effect transistor MOS.The N pole of voltage stabilizing diode D3 is connected with the positive pole of electric capacity C2, its P pole is then connected with the drain electrode of field effect transistor MOS after inductance L 1.The base stage of described triode VT2 is connected with the VDD pin of process chip U1.The N pole of described voltage stabilizing diode D3 and P form the output terminal of this filtering circuit extremely jointly.
Described voltage feedback circuit is by triode VT3, and electric capacity C4, polar capacitor C3, resistance R6, resistance R1, resistance R2 and diode D4 form.
During connection, the positive pole of electric capacity C4 is connected with the source electrode of field effect transistor MOS, its negative pole is then connected with the emitter of triode VT3.One end of resistance R6 is connected with the collector of triode VT3, its other end ground connection.The positive pole of polar capacitor C3 is connected with the source electrode of field effect transistor MOS, its negative pole is then connected with the base stage of triode VT3.The N pole of diode D4 is connected with the base stage of triode VT3, its P pole is then connected with the SENSE+ pin of process chip U1 after resistance R1 through resistance R2 in turn.
During work, the voltage after the Transformer Rectifier filtering circuit process of front end is input to process chip U1 to carry out transformation process and exports from the PWM pin of process chip U1.Voltage feedback circuit is then sampled to the voltage that the PWM pin of process chip U1 exports, and feeding back to the SENSE+ pin of process chip U1, process chip U1 adjusts the pulse duty factor of its inside according to the sampled voltage fed back thus makes the constant current hold that its PWM pin exports; Filtering circuit exports after voltage can being carried out filtering.
As shown in Figure 3, described analog-to-digital conversion module by amplifier P1, amplifier P2, triode VT4, triode VT5, triode VT6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, diode D5, diode D6 and diode D7 form.
Wherein, resistance R7, resistance R8, resistance R9, electric capacity C6, electric capacity C7, electric capacity C8, amplifier P1, amplifier P2, diode D5, triode VT4, triode VT5 and triode VT6 form a converter.Between the positive pole that this resistance R8 is serially connected in amplifier P1 and output terminal.The positive pole of electric capacity C8 is connected with the negative pole of amplifier P1, its minus earth.Resistance R7 is serially connected between the positive pole of amplifier P1 and the emitter of triode VT4.The N pole of diode D5 is connected with the base stage of triode VT5, its P pole is then connected with the output terminal of amplifier P1.Between the positive pole that electric capacity C7 is serially connected in amplifier P2 and output terminal.Resistance R9 is serially connected between the negative pole of amplifier P2 and the emitter of triode VT6.Ground connection while the positive pole of electric capacity C6 is connected with the collector of triode VT4, its negative pole is then connected with the negative pole of amplifier P2.The positive pole of described amplifier P1 and the emitter of triode VT4 form the input end of this analog-to-digital conversion module jointly.The base stage of described triode VT4 is connected with the positive pole of amplifier P2.The base stage of described triode VT6 is connected with the output terminal of amplifier P2, its collector is then connected with the emitter of triode VT5.Temperature signal exports from being converted to digital electric signal by converter after the input of the input end of analog-to-digital conversion module is come in from the collector of triode VT5 and triode VT6.
Meanwhile, the P pole of diode D6 is connected with the collector of triode VT5, its N pole is then connected with the emitter of triode VT5 after electric capacity C9.The N pole of diode D7 is connected with the N pole of diode D6, its P pole is then connected with the emitter of triode VT5.One end of resistance R10 is connected with the collector of triode VT6, its other end then forms the output terminal of this analog-to-digital conversion module extremely jointly with the N of diode D6.This diode D6, diode D7 and electric capacity C9 form wave filter, and it can carry out filtering process to digital electric signal.The input end of described analog-to-digital conversion module is connected with temperature sensor, its output terminal is then connected with central processing unit.
As shown in Figure 4, described differential amplification module by amplifier P3, amplifier P4, field effect transistor MOS1, triode VT7, triode VT8, resistance R11, resistance R12, resistance R13, resistance R14, electric capacity C10, polar capacitor C11, electric capacity C12, electric capacity C13, voltage stabilizing diode D8, diode D9, diode D10 form.
During connection, the N pole of voltage stabilizing diode D8 is connected with the positive pole of amplifier P3 after resistance R11, its P pole ground connection.The N pole of diode D10 is connected with the positive pole of amplifier P3 after resistance R13, its P pole is then connected with the output terminal of amplifier P4.The positive pole of electric capacity C10 is connected with the negative pole of amplifier P3 after resistance R12, its negative pole is then connected with the emitter of triode VT7.The N pole of diode D9 is connected with the negative pole of amplifier P4, its P pole is then connected with the collector of triode VT7.The positive pole of polar capacitor C11 is connected with the source electrode of field effect transistor MOS1, its minus earth.Electric capacity C12 is then serially connected between the source electrode of field effect transistor MOS1 and the base stage of triode VT8.One end of resistance R14 is connected with the collector of triode VT8, its other end ground connection.The negative pole of electric capacity C13 is connected with the N pole of diode D10, its positive pole then forms the output terminal of this differential amplification module jointly with the output terminal of amplifier P3.
Meanwhile, the N pole of described voltage stabilizing diode D8 and the positive pole of electric capacity C10 form the input end of this differential amplification module jointly.Grounded collector, its base stage of described triode VT7 are then connected with the output terminal of amplifier P4.The grid of described field effect transistor MOS1 is connected with the positive pole of amplifier P4, it drains and be then connected with the negative pole of electric capacity C13.The emitter of described triode VT8 is connected with the output terminal of amplifier P3; The described input end of differential amplification module is connected with the output terminal of voltage acquisition module, its output terminal is then connected with central processing unit.
During work, the anode voltage collected inputs to amplifier P3 and amplifies after voltage stabilizing diode D8, and amplifier P4 then can carry out zero correction to voltage, therefore can distortionlessly amplify voltage signal, thus improves the sharpness of voltage signal.
As mentioned above, just well the present invention can be realized.

Claims (8)

1. based on the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument of signal conversion, it is characterized in that, primarily of central processing unit, the constant current source module be connected with central processing unit respectively, differential amplification module, display, analog-to-digital conversion module and memory module, the voltage acquisition module be connected with differential amplification module, and the temperature sensor be connected with analog-to-digital conversion module forms, described analog-to-digital conversion module is by amplifier P1, amplifier P2, triode VT4, triode VT5, triode VT6, be serially connected in the resistance R8 between the positive pole of amplifier P1 and output terminal, positive pole is connected with the negative pole of amplifier P1, the electric capacity C8 of minus earth, be serially connected in the resistance R7 between the positive pole of amplifier P1 and the emitter of triode VT4, N pole is connected with the base stage of triode VT5, the diode D5 that P pole is then connected with the output terminal of amplifier P1, P pole is connected with the collector of triode VT5, the diode D6 that N pole is then connected with the emitter of triode VT5 after electric capacity C9, N pole is connected with the N pole of diode D6, the diode D7 that P pole is then connected with the emitter of triode VT5, be serially connected in the electric capacity C7 between the positive pole of amplifier P2 and output terminal, be serially connected in the resistance R9 between the negative pole of amplifier P2 and the emitter of triode VT6, positive pole is connected with the collector of triode VT4, the electric capacity C6 of ground connection while negative pole is then connected with the negative pole of amplifier P2, and one end is connected with the collector of triode VT6, the resistance R10 that the other end then forms the output terminal of this analog-to-digital conversion module extremely jointly with the N of diode D6 forms, the positive pole of described amplifier P1 and the emitter of triode VT4 form the input end of this analog-to-digital conversion module jointly, the base stage of described triode VT4 is connected with the positive pole of amplifier P2, the base stage of described triode VT6 is connected with the output terminal of amplifier P2, its collector is then connected with the emitter of triode VT5, the input end of described analog-to-digital conversion module is connected with temperature sensor, its output terminal is then connected with central processing unit, described constant current source module is then by front end Transformer Rectifier filtering circuit, the power factor correction circuit be connected with front end Transformer Rectifier filtering circuit, the step-down conversion circuit be connected with power factor correction circuit, the filtering circuit be simultaneously connected with step-down conversion circuit with power factor correction circuit, and the voltage feedback circuit be connected with step-down conversion circuit forms, the output terminal of described filtering circuit is connected with central processing unit, the input termination civil power of front end Transformer Rectifier filtering circuit.
2. the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion according to claim 1, it is characterized in that, described differential amplification module is by amplifier P3, amplifier P4, field effect transistor MOS1, triode VT7, triode VT8, N pole is connected with the positive pole of amplifier P3 after resistance R11, the voltage stabilizing diode D8 of P pole ground connection, N pole is connected with the positive pole of amplifier P3 after resistance R13, the diode D10 that P pole is then connected with the output terminal of amplifier P4, positive pole is connected with the negative pole of amplifier P3 after resistance R12, the electric capacity C10 that negative pole is then connected with the emitter of triode VT7, N pole is connected with the negative pole of amplifier P4, the diode D9 that P pole is then connected with the collector of triode VT7, positive pole is connected with the source electrode of field effect transistor MOS1, the polar capacitor C11 of minus earth, be serially connected in the electric capacity C12 between the source electrode of field effect transistor MOS1 and the base stage of triode VT8, one end is connected with the collector of triode VT8, the resistance R14 of other end ground connection, and negative pole is connected with the N pole of diode D10, the electric capacity C13 that positive pole then forms the output terminal of this differential amplification module jointly with the output terminal of amplifier P3 forms, the N pole of described voltage stabilizing diode D8 and the positive pole of electric capacity C10 form the input end of this differential amplification module jointly, grounded collector, its base stage of described triode VT7 are then connected with the output terminal of amplifier P4, the grid of described field effect transistor MOS1 is connected with the positive pole of amplifier P4, it drains and be then connected with the negative pole of electric capacity C13, the emitter of described triode VT8 is connected with the output terminal of amplifier P3, the described input end of differential amplification module is connected with the output terminal of voltage acquisition module, its output terminal is then connected with central processing unit.
3. the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion according to claim 2, it is characterized in that, described front end Transformer Rectifier filtered electrical routing transformer T, diode rectifier U, the fuse FU that one end is connected with the Same Name of Ends of the telefault on the former limit of transformer T, the other end then forms the input end of this front end Transformer Rectifier filtering circuit jointly with the non-same polarity of the telefault on the former limit of transformer T, and the electric capacity C1 be serially connected between the cathode output end of diode rectifier U and cathode output end forms; An input end of described diode rectifier U is connected with the non-same polarity of the telefault of transformer T secondary, its another input end is then connected with the Same Name of Ends of the telefault of transformer T secondary; The cathode output end of described diode rectifier U is connected with step-down conversion circuit, its cathode output end is then connected with power factor correction circuit.
4. the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion according to claim 3, it is characterized in that, described power factor correction circuit is by triode VT1, positive pole is connected with the cathode output end of diode rectifier U, the electric capacity C2 that negative pole is then connected with step-down conversion circuit, be serially connected in the resistance R3 between the negative pole of electric capacity C2 and the base stage of triode VT1, N pole is connected with the positive pole of electric capacity C2, the diode D1 that P pole is then connected with the emitter of triode VT1, and N pole is connected with the positive pole of electric capacity C2, the diode D2 that P pole is then connected with the collector of triode VT1 forms, the positive pole of described electric capacity C2 is also connected with filtering circuit, the collector of described triode VT1 is connected with step-down conversion circuit.
5. the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion according to claim 4, it is characterized in that, described step-down conversion circuit is by process chip U1, field effect transistor MOS, and the resistance R5 be serially connected between the PWM pin of process chip U1 and the grid of field effect transistor MOS forms; The SW pin of described process chip U1 is connected with the negative pole of electric capacity C2, its VIN pin is then connected with the collector of triode VT1, VDD pin is then connected with filtering circuit, COMP pin is then connected with voltage feedback circuit with the equal ground connection of GND pin, SENSE+ pin, its SENSE-pin is then connected with the cathode output end of diode rectifier U; The drain electrode of described field effect transistor MOS is connected with the VDD pin of process chip U1 with filtering circuit simultaneously, its source electrode is then connected with voltage feedback circuit.
6. the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion according to claim 5, it is characterized in that, described filtering circuit is by triode VT2, be serially connected in the resistance R4 between the positive pole of electric capacity C2 and the emitter of triode VT2, the electric capacity C5 that positive pole is connected with the collector of triode VT2, negative pole is then connected with the drain electrode of field effect transistor MOS, and the voltage stabilizing diode D3 that N pole is connected with the positive pole of electric capacity C2, P pole is then connected with the drain electrode of field effect transistor MOS after inductance L 1 forms; The base stage of described triode VT2 is connected with the VDD pin of process chip U1; The N pole of described voltage stabilizing diode D3 and P form the output terminal of this filtering circuit extremely jointly.
7. the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion according to claim 6, it is characterized in that, described voltage feedback circuit is by triode VT3, positive pole is connected with the source electrode of field effect transistor MOS, the electric capacity C4 that negative pole is then connected with the emitter of triode VT3, one end is connected with the collector of triode VT3, the resistance R6 of other end ground connection, positive pole is connected with the source electrode of field effect transistor MOS, the polar capacitor C3 that negative pole is then connected with the base stage of triode VT3, and N pole is connected with the base stage of triode VT3, the diode D4 that P pole is then connected with the SENSE+ pin of process chip U1 after resistance R1 through resistance R2 in turn forms.
8. the differential amplification formula constant current source aluminium electrolysis anode current measuring instrument based on signal conversion according to claim 7, it is characterized in that, described process chip U1 is SD42560 integrated chip.
CN201510785836.1A 2015-11-16 2015-11-16 Differential amplification type constant-current source aluminum electrolysis anode current measuring instrument based on signal conversion Withdrawn CN105425024A (en)

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