阅读说明：本技术 一种电流调节电路 (A kind of current regulating circuit ) 是由 不公告发明人 于 2019-09-03 设计创作，主要内容包括：本发明实施例公开了一种电流调节电路,该电流调节电路包括：远端电压信号产生电路、信号光耦隔离电路以及信号处理输出电路,信号光耦隔离电路与远端电压信号产生电路以及信号处理输出电路电连接；远端电压信号产生电路用于根据远端电压信号产生电路的输入信号产生第一电压信号,并将第一电压信号中的高频信号滤除得到第二电压信号,信号光耦隔离电路用于将第二电压信号进行光耦隔离,信号处理输出电路用于对信号光耦隔离电路输出的信号进行处理并输出电流信号。本发明实施例提供的电流调节电路,通过远端电压信号产生电路滤除电压信号中的高频信号,减少线路中的高频干扰,实现远程电流调节,提高电路的可靠性。(The embodiment of the invention discloses a kind of current regulating circuits, the current regulating circuit includes: distal end voltage signal generation circuit, signal optical coupling isolation circuit and signal processing output circuit, and signal optical coupling isolation circuit is electrically connected with distal end voltage signal generation circuit and signal processing output circuit；Distal end voltage signal generation circuit is used to generate first voltage signal according to the input signal of distal end voltage signal generation circuit, and the high-frequency signal in first voltage signal is filtered out to obtain second voltage signal, signal optical coupling isolation circuit is used to carry out second voltage signal light-coupled isolation, and signal processing output circuit is used to handle to the signal that signal optical coupling isolation circuit exports and output current signal.Current regulating circuit provided in an embodiment of the present invention filters out the high-frequency signal in voltage signal by distal end voltage signal generation circuit, reduces the High-frequency Interference in route, realize long-range current regulation, improve the reliability of circuit.)

1. a kind of current regulating circuit characterized by comprising

Distal end voltage signal generation circuit, signal optical coupling isolation circuit and signal processing output circuit, the signal optocoupler every It is electrically connected from circuit with the distal end voltage signal generation circuit and the signal processing output circuit；

The distal end voltage signal generation circuit is used to generate the according to the input signal of the distal end voltage signal generation circuit One voltage signal, and the high-frequency signal in the first voltage signal is filtered out to obtain second voltage signal, the signal optocoupler Isolation circuit is used to carrying out the second voltage signal into light-coupled isolation, and the signal processing output circuit is used for the signal The signal of optical coupling isolation circuit output handle and output current signal.

2. current regulating circuit according to claim 1, which is characterized in that the distal end voltage signal generation circuit includes Distal end potentiometer, first diode, first resistor, second resistance, first capacitor, the second capacitor and common mode inductance；The distal end Potentiometer includes at least the first output end and second output terminal；The current regulating circuit further includes regulating switch, the adjusting Switch is for adjusting the voltage difference between first output end and the second output terminal；The first end of the first diode It is electrically connected to a power source, the second end of the first diode is electrically connected with the first end of the first resistor, the first resistor Second end be electrically connected with the first end of the common mode inductance, input terminal and the regulating switch of the distal end potentiometer are electrically connected It connects, the first output end is electrically connected with the second end of the first resistor, and the second end of the first resistor is also electric with described first The first end of appearance is electrically connected, the second end ground connection of the first capacitor, the second output terminal of the distal end potentiometer with it is described total The second end of mould inductance is electrically connected, and the third end of the common mode inductance is grounded by the second resistance, the common mode inductance Second end is electrically connected with the first end of second capacitor, the second end of second capacitor ground connection, and the of the common mode inductance Four ends are electrically connected as the output end of the distal end voltage signal generation circuit with the signal optical coupling isolation circuit.

3. current regulating circuit according to claim 2, which is characterized in that the output end of the distal end potentiometer further includes Third output end, the third output end are electrically connected with the second output terminal.

4. current regulating circuit according to claim 3, which is characterized in that the distal end potentiometer is variable resistance, The variable resistance includes first end, second end and resistance adjustment end, and the first end of the variable resistance is as described remote First output end of terminal potential device, third output end of the second end of the variable resistance as the distal end potentiometer, institute State the resistance adjustment end of variable resistance as the distal end potentiometer input terminal and the distal end potentiometer second Output end.

5. current regulating circuit according to claim 2, which is characterized in that the signal optical coupling isolation circuit includes third Resistance, the 4th resistance, the 5th resistance, the 6th resistance, second switch, third switching tube, third capacitor, the 4th capacitor, first Operational amplifier and photoelectrical coupler；The photoelectrical coupler includes the first optocoupler of primary side diode, primary side internal components and pair Side internal components, the primary side internal components include the first pin of primary side and primary side second pin, pair side internal components packet Include the secondary second pin in the first pin and pair；The first end of the 3rd resistor and the 4th end of the common mode inductance are electrically connected It connects, the second end of the 3rd resistor is electrically connected with the first end of the second switch, the second end of the second switch It is electrically connected with the first end of the power electric connection, the third switching tube with the first end of the second switch, described The second ends of three switching tubes is grounded, and the first end of the third capacitor is electrically connected with the second end of the 3rd resistor, and described the The second end of three capacitors is grounded, and the first end of the 4th resistance is electrically connected with the first end of the third capacitor, and the described 4th The second end of resistance is electrically connected with the second end of the third capacitor, the non-inverting input terminal of first operational amplifier with it is described The first end of 4th resistance is electrically connected, the first end electricity of the inverting input terminal of first operational amplifier and the 4th capacitor Connection, the second end of the 4th capacitor are electrically connected with the output end of first operational amplifier, first operation amplifier The output end of device is electrically connected with the first end of the 5th resistance, the second end of the 5th resistance and first optocoupler of primary side The positive terminal of diode is electrically connected, the negative pole end ground connection of the first optocoupler of primary side diode, the primary side second pin and institute State the inverting input terminal electrical connection of the first operational amplifier, first pin of primary side and the power electric connection, the pair side Second pin and the power electric connection, pair first pin of side are drawn by the 6th resistance eutral grounding, the pair side first Foot is electrically connected as the output end of the signal optical coupling isolation circuit with the signal processing output circuit.

6. current regulating circuit according to claim 5, which is characterized in that the signal processing output circuit includes signal Processing circuit and signal output apparatus, the signal processing circuit and signal output apparatus electrical connection；

Wherein, the signal processing circuit includes the 7th resistance, the 8th resistance, the 9th resistance, the 5th capacitor, the second operation amplifier Device, single-chip microcontroller；The non-inverting input terminal of the second operational amplifier is electrically connected with the first pin of the secondary side, second operation The inverting input terminal of amplifier is electrically connected with the output end of the second operational amplifier, the output of the second operational amplifier End is electrically connected with the first end of the 7th resistance, and the second end of the 7th resistance and the first end of the 8th resistance are electrically connected It connecing, the second end ground connection of the 8th resistance, the first end of the 9th resistance is electrically connected with the first end of the 8th resistance, The second end of 9th resistance is electrically connected with the analog signal input pin of the single-chip microcontroller, the first end of the 5th capacitor It is electrically connected with the second end of the 9th resistance, the second end ground connection of the 5th capacitor, the analog signal of the single-chip microcontroller is defeated Pin is electrically connected with the signal output apparatus out.

7. current regulating circuit according to claim 6, which is characterized in that the signal output apparatus includes third operation Amplifier, the tenth resistance, eleventh resistor, twelfth resistor and thirteenth resistor, the first end of the tenth resistance with it is described The analog signal output pin of single-chip microcontroller is electrically connected, the second end and the same phase of the third operational amplifier of the tenth resistance Input terminal electrical connection, the inverting input terminal of the third operational amplifier are grounded by the thirteenth resistor, the third fortune The inverting input terminal for calculating amplifier is also electrically connected by the eleventh resistor with the output end of the third operational amplifier, institute The output end for stating third operational amplifier is electrically connected with the first end of the twelfth resistor, the second end of the twelfth resistor Output end as the signal processing output circuit.

8. current regulating circuit according to claim 6, which is characterized in that the single-chip microcontroller is integrated in welding machine.

9. current regulating circuit according to claim 7, which is characterized in that the twelfth resistor is adjustable resistance.

10. current regulating circuit according to claim 5, which is characterized in that the second switch and the third are opened Closing pipe is diode.

Technical field

The present embodiments relate to Current Control Technology field more particularly to a kind of current regulating circuits.

Background technique

With the application development of argon arc welding machine control technology, there is the welding machine of distal end regulatory function to use more more and more universal, from For client service condition, various large machiness need remote control machine to export electric current, pass through remote control current regulation electricity Road controls output electric current.

Currently, existing current regulating circuit, when distal end adjusts welding machine function and distal end remotely control, current regulation electricity There are high-frequency interferencing signals for road, influence the reliability of circuit, become the big obstacle for realizing that welding machine remotely controls.

Summary of the invention

The present invention provides a kind of current regulating circuit, to reduce the High-frequency Interference in route, improves the reliability of circuit, real The remote adjustment of existing electric current.

In a first aspect, the embodiment of the invention provides a kind of current regulating circuits, comprising:

Distal end voltage signal generation circuit, signal optical coupling isolation circuit and signal processing output circuit, signal optocoupler every It is electrically connected from circuit with distal end voltage signal generation circuit and signal processing output circuit；

Distal end voltage signal generation circuit is used to generate the first electricity according to the input signal of distal end voltage signal generation circuit Signal is pressed, and the high-frequency signal in first voltage signal is filtered out to obtain second voltage signal, signal optical coupling isolation circuit is used for Second voltage signal is subjected to light-coupled isolation, the signal that signal processing output circuit is used to export signal optical coupling isolation circuit into Row processing and output current signal.

Optionally, distal end voltage signal generation circuit includes distal end potentiometer, first diode, first resistor, the second electricity Resistance, first capacitor, the second capacitor and common mode inductance；Distal end potentiometer includes at least the first output end and second output terminal；Electric current Adjusting circuit further includes regulating switch, and regulating switch is used to adjust the voltage difference between the first output end and second output terminal；The The first end of one diode is electrically connected to a power source, and the second end of first diode is electrically connected with the first end of first resistor, and first The second end of resistance is electrically connected with the first end of common mode inductance, and the input terminal of distal end potentiometer is electrically connected with regulating switch, and first Output end is electrically connected with the second end of first resistor, and the second end of first resistor is also electrically connected with the first end of first capacitor, the The second end of one capacitor is grounded, and the second output terminal of distal end potentiometer is electrically connected with the second end of common mode inductance, common mode inductance Third end is grounded by second resistance, and the second end of common mode inductance is electrically connected with the first end of the second capacitor, and the of the second capacitor Two ends ground connection, output end and signal optical coupling isolation circuit electricity of the 4th end of common mode inductance as distal end voltage signal generation circuit Connection.

Optionally, the output end of distal end potentiometer further includes third output end, and third output end is electrically connected with second output terminal It connects.

Optionally, distal end potentiometer is variable resistance, and variable resistance includes first end, second end and resistance adjustment End, first output end of the first end of variable resistance as distal end potentiometer, the second end of variable resistance is as distal end electricity The third output end of position device, the resistance adjustment end of variable resistance as distal end potentiometer input terminal and distal end potentiometer the Two output ends.

Optionally, signal optical coupling isolation circuit includes 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, second opens Guan Guan, third switching tube, third capacitor, the 4th capacitor, the first operational amplifier and photoelectrical coupler；Photoelectrical coupler includes original The internal components in the first optocoupler diode, primary side internal components and pair, the primary side internal components include the first pin of primary side With primary side second pin, secondary first pin when internal components include secondary and secondary side second pin；The first of 3rd resistor End is electrically connected with the 4th end of common mode inductance, and the second end of 3rd resistor is electrically connected with the first end of second switch, and second opens The second end for closing pipe is electrically connected to a power source, and the first end of third switching tube is electrically connected with the first end of second switch, and third is opened The second end ground connection of pipe is closed, the first end of third capacitor is electrically connected with the second end of 3rd resistor, the second termination of third capacitor The first end on ground, the 4th resistance is electrically connected with the first end of third capacitor, the second end of the 4th resistance and the second of third capacitor End electrical connection, the non-inverting input terminal of the first operational amplifier are electrically connected with the first end of the 4th resistance, the first operational amplifier Inverting input terminal is electrically connected with the first end of the 4th capacitor, the second end of the 4th capacitor and the output end electricity of the first operational amplifier Connection, the output end of the first operational amplifier is electrically connected with the first end of the 5th resistance, the second end of the 5th resistance and primary side the The positive terminal of one optocoupler diode is electrically connected, the negative pole end ground connection of primary side the first optocoupler diode, primary side second pin and first The inverting input terminal of operational amplifier is electrically connected, and the first pin of primary side is electrically connected to a power source, and secondary side second pin is electrically connected with power supply It connects, secondary the first pin of side passes through the 6th resistance eutral grounding, output end and letter of secondary the first pin of side as signal optical coupling isolation circuit The electrical connection of number processing output circuit.

Optionally, signal processing output circuit includes signal processing circuit and signal output apparatus, signal processing circuit and Signal output apparatus electrical connection；

Wherein, signal processing circuit includes the 7th resistance, the 8th resistance, the 9th resistance, the 5th capacitor, the second operation amplifier Device, single-chip microcontroller；The non-inverting input terminal of second operational amplifier is electrically connected with the first pin of secondary side, the reverse phase of second operational amplifier Input terminal is electrically connected with the output end of second operational amplifier, the first end of the output end of second operational amplifier and the 7th resistance Electrical connection, the second end of the 7th resistance are electrically connected with the first end of the 8th resistance, the second end ground connection of the 8th resistance, the 9th resistance First end be electrically connected with the first end of the 8th resistance, the analog signal input pin electricity of the second end of the 9th resistance and single-chip microcontroller Connection, the first end of the 5th capacitor are electrically connected with the second end of the 9th resistance, the second end ground connection of the 5th capacitor, the mould of single-chip microcontroller Quasi- signal output pin is electrically connected with signal output apparatus.

Optionally, signal output apparatus includes third operational amplifier, the tenth resistance, eleventh resistor, twelfth resistor And thirteenth resistor, the first end of the tenth resistance are electrically connected with the analog signal output pin of single-chip microcontroller, the second of the tenth resistance End is electrically connected with the non-inverting input terminal of third operational amplifier, and the inverting input terminal of third operational amplifier passes through thirteenth resistor Ground connection, the inverting input terminal of third operational amplifier also passes through eleventh resistor and the output end of third operational amplifier is electrically connected It connects, the output end of third operational amplifier is electrically connected with the first end of twelfth resistor, and the second end of twelfth resistor is as letter The output end of number processing output circuit.

Optionally, single-chip microcontroller is integrated in welding machine.

Optionally, twelfth resistor is adjustable resistance.

Optionally, second switch and third switching tube are diode.

The embodiment of the invention provides a kind of current regulating circuits, including distal end voltage signal generation circuit, signal optocoupler At isolation circuit and signal processing output circuit, signal optical coupling isolation circuit and distal end voltage signal generation circuit and signal Output circuit electrical connection is managed, distal end voltage signal generation circuit generates the according to the input signal of distal end voltage signal generation circuit One voltage signal, and the high-frequency signal in first voltage signal is filtered out to obtain second voltage signal, signal optical coupling isolation circuit Second voltage signal is subjected to light-coupled isolation, the signal that signal processing output circuit exports optical coupling isolation circuit is handled simultaneously Output current signal.The high-frequency signal in voltage signal is filtered out by distal end voltage signal generation circuit, reduces the height in route Frequency interferes, and realizes signal isolation by signal optical coupling isolation circuit, improves the reliability of circuit, realizes the long-range tune of electric current Section.

Detailed description of the invention

Fig. 1 is a kind of structural block diagram of current regulating circuit provided in an embodiment of the present invention；

Fig. 2 is a kind of structural schematic diagram of distal end voltage signal generation circuit provided in an embodiment of the present invention；

Fig. 3 is a kind of structural schematic diagram of signal optical coupling isolation circuit provided in an embodiment of the present invention；

Fig. 4 is a kind of structural schematic diagram of signal processing output circuit provided in an embodiment of the present invention；

Fig. 5 is the structural schematic diagram of another current regulating circuit provided in an embodiment of the present invention.

Specific embodiment

The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.

Based on existing current regulating circuit, when distal end adjusts welding machine function and distal end remotely control, current regulation electricity There are high-frequency interferencing signals in road, and the problem of influencing the reliability of circuit, bring obstacle to remote control welding machine, the present embodiment is mentioned A kind of current regulating circuit is supplied, the case where the present embodiment is applicable to argon arc welding machine distal end current regulation control, Fig. 1 is this hair A kind of structural block diagram for current regulating circuit that bright embodiment provides, with reference to Fig. 1, which includes: distal end voltage Signal generating circuit 10, signal optical coupling isolation circuit 20 and signal processing output circuit 30；

Signal optical coupling isolation circuit 20 is electrically connected with distal end voltage signal generation circuit 10 and signal processing output circuit 30 It connects；Distal end voltage signal generation circuit 10 is used to generate first voltage according to the input signal of distal end voltage signal generation circuit 10 Signal, and the high-frequency signal in first voltage signal is filtered out to obtain second voltage signal, signal optical coupling isolation circuit 20 is used for Second voltage signal is subjected to light-coupled isolation, signal processing output circuit 30 is used for the letter exported to signal optical coupling isolation circuit 20 Number handle and output current signal.

Illustratively, various large machiness such as argon arc welding machine needs remote control machine to export electric current, is controlled by configuring distal end Box processed, realizes foot-operated regulatory function, but ginseng has a high-frequency signal in high frequency starting the arc machine such as argon arc welding machine its control line, in control line There is high-frequency signal to generate interference to route.To realize that machine distal end adjusts the long-range control of welding machine and distal end, need to filter out on route High-frequency interferencing signal reduces the influence to late-class circuit.Distal end voltage regulator circuit 10 is schematically illustrated with reference to Fig. 1, Fig. 1 The case where being electrically connected with floor push, distal end voltage regulator circuit 10 can be according to the signal magnitude outputs that floor push inputs not With size first voltage signal, in current regulating circuit provided in this embodiment, floor push and distal end voltage signal generate electricity The input terminal M1 on road 10 is electrically connected, and the output end N1 of distal end voltage signal generation circuit 10 is defeated with signal optical coupling isolation circuit 20 Enter N2 is held to be electrically connected, the output end H1 of signal optical coupling isolation circuit 20 is electrically connected with the input terminal H2 of signal processing output circuit 30 It connects, the output end J1 of signal processing output circuit 30 is used for output current signal.It is produced by distal end voltage signal generation circuit 10 Raw first voltage signal, and the high-frequency signal in first voltage signal is filtered out to obtain second voltage signal, it realizes and high frequency is believed Number filter out, second voltage signal is carried out light-coupled isolation by signal optical coupling isolation circuit 20, the isolation of electric signal is realized, at signal The signal that reason output circuit 30 exports signal optical coupling isolation circuit 20 handle and output current signal, therefore the electric current tune The anti-High-frequency Interference ability in road of economizing on electricity is strong, can be avoided high-frequency signal interference late-class circuit, promotes the reliability of circuit.Also, it will When the current regulating circuit is applied to argon arc welding machine, distal end voltage signal generation circuit 10 and floor push are set to argon arc welding The distal end of machine, and then realize the remote control to argon arc welding machine.

Current regulating circuit provided in this embodiment, including distal end voltage signal generation circuit, signal optical coupling isolation circuit And signal processing output circuit, signal optical coupling isolation circuit and distal end voltage signal generation circuit and signal processing export electricity Road electrical connection, distal end voltage signal generation circuit, which generates first voltage according to the input signal of distal end voltage signal generation circuit, to be believed Number, and the high-frequency signal in first voltage signal is filtered out to obtain second voltage signal, signal optical coupling isolation circuit is electric by second Signal is pressed to carry out light-coupled isolation, the signal that signal processing output circuit exports optical coupling isolation circuit is handled and adjusts output Electric current.The high-frequency signal in voltage signal is filtered out by distal end voltage signal generation circuit, reduces the High-frequency Interference in route, with And signal isolation is realized by signal optical coupling isolation circuit, the reliability of circuit is improved, realizes the remote adjustment of electric current.

Fig. 2 is a kind of schematic diagram of distal end voltage signal generation circuit provided in an embodiment of the present invention, in above-mentioned technical side On the basis of case, optionally, with reference to Fig. 2, distal end voltage signal generation circuit 10 includes distal end potentiometer 11, first diode D1, first resistor R1, second resistance R2, first capacitor C1, the second capacitor C2 and common mode inductance LF；Distal end potentiometer 11 at least wraps Include the first output end K1 and second output terminal K2；Current regulating circuit further includes regulating switch 12, and regulating switch 12 is for adjusting Voltage difference between first output end K1 and second output terminal K2；The first end of first diode D1 is electrically connected to a power source, and first The second end of diode D1 is electrically connected with the first end of first resistor R1, and the of the second end of first resistor R1 and common mode inductance LF One end electrical connection, the input terminal, that is, distal end voltage signal generation circuit 10 input terminal M1 and regulating switch 12 of distal end potentiometer 11 Electrical connection, the first output end K1 is electrically connected with the second end of first resistor R1, the second end of first resistor R1 also with first capacitor The first end of C1 is electrically connected, the second end ground connection of first capacitor C1, the second output terminal K2 and common mode inductance of distal end potentiometer 11 The second end of LF is electrically connected, and the third end of common mode inductance LF is grounded by second resistance R2, the second end of common mode inductance LF and the The first end of two capacitor C2 is electrically connected, and the second end ground connection of the second capacitor C2, the 4th end of common mode inductance LF is as distal end voltage The output end of signal generating circuit 11 is electrically connected with signal optical coupling isolation circuit.

Illustratively, supply voltage can be 15V, be that distal end voltage signal generation circuit 10 is powered by 15V voltage signal.Tool Body, regulating switch 12 can adjust the voltage difference between distal end potentiometer the first output end K1 and second output terminal K2 Section, such as can be exported by way of the resistance of distal end potentiometer between the first output end K1 and second output terminal K2 to first Voltage difference between the K1 and second output terminal K2 of end is adjusted, and passes through resistance between the first output end K1 and second output terminal K2 It is divided with second resistance R2, and first voltage signal is filtered out by first capacitor C1, the second capacitor C2 and common mode inductance LF In high-frequency signal, avoid high-frequency signal from interfering late-class circuit, and first diode D1 can play anti-reverse breakdown effects, can The high pressure in circuit is stopped to damage 15V power supply, the first end of first diode D1 is grounded by capacitor C6.

Optionally, the output end of distal end potentiometer 11 further includes third output end K3, the output of third output end K3 and second Hold K2 electrical connection.

Specifically, distal end potentiometer 11 may include three output ends, potentiometer is usually by resistor body and moveable electricity Brush composition obtains in output end when brush is moved along resistor body and displacement is at the resistance value of certain relationship, potentiometer was both It can make three-terminal element use and also make two-terminal element use.As shown in Fig. 2, second output terminal K2 can be electrically connected with moveable brush It connects, then with the movement of brush, the resistance between the first output end K1 and second output terminal K2 is changed correspondingly.

Optionally, distal end potentiometer 11 is variable resistance, and variable resistance includes first end, second end and resistance adjustment End, first output end K1 of the first end of variable resistance as distal end potentiometer 11, the second end of variable resistance is as remote The third output end K3 of terminal potential device 11, the resistance adjustment end of variable resistance is as the input terminal M1 of distal end potentiometer 11 and remote The second output terminal K2 of terminal potential device 11.

Illustratively, the resistance value maximum of variable resistance can be transferred to 10k, can by the first output end and third output end Voltage signal corresponding with maximum value is exported, is become 0 to 10k by the resistance value of regulating switch adjustable variable resistor Change, arrives the corresponding voltage signal of certain resistance value with adjusting by the way that the first output end and second output terminal are exportable.

Fig. 3 is a kind of schematic diagram of signal optical coupling isolation circuit provided in an embodiment of the present invention, in above-mentioned technical proposal On the basis of, optionally, with reference to Fig. 3, optionally, signal optical coupling isolation circuit 20 includes 3rd resistor R3, the 4th resistance R4, the 5th Resistance R5, the 6th resistance R6, second switch D2, third switching tube D3, third capacitor C3, the 4th capacitor C4, the first operation are put Big device 21 and photoelectrical coupler 22 (HCNR200)；Photoelectrical coupler 22 includes primary side the first optocoupler diode D4, primary side inside device Part and secondary side internal components, primary side internal components include the first pin of primary side 3 and primary side second pin 4, secondary side internal components packet Include the secondary second pin 6 in the first pin 5 and pair；The first end of 3rd resistor R3 is electrically connected with the 4th end of common mode inductance, the The second end of three resistance R3 is electrically connected with the first end of second switch D2, and second end and the power supply of second switch D2 is electrically connected It connecing, the first end of third switching tube D3 is electrically connected with the first end of second switch D2, the second end ground connection of third switching tube D3, The first end of third capacitor C3 is electrically connected with the second end of 3rd resistor R3, the second end ground connection of third capacitor C3, the 4th resistance The first end of R4 is electrically connected with the first end of third capacitor C3, the second end of the 4th resistance R4 and the second end electricity of third capacitor C3 Connection, the non-inverting input terminal of the first operational amplifier 21 are electrically connected with the first end of the 4th resistance R3, the first operational amplifier 21 Inverting input terminal be electrically connected with the first end of the 4th capacitor C4, the second end of the 4th capacitor C4 and the first operational amplifier 21 Output end electrical connection, the output end of the first operational amplifier 21 are electrically connected with the first end of the 5th resistance R5, the 5th resistance R5's Second end is electrically connected with the positive terminal of primary side the first optocoupler diode D4, the negative pole end ground connection of primary side the first optocoupler diode D4, Primary side second pin 4 is electrically connected with the inverting input terminal of the first operational amplifier 21, and the first pin of primary side 3 is electrically connected to a power source, Secondary side second pin 6 is electrically connected to a power source, and secondary the first pin of side 5 is grounded by the 6th resistance R6, and secondary the first pin of side 5 is as letter The output end of number optical coupling isolation circuit 20 is electrically connected with signal processing output circuit.

Specifically, power supply can provide 15V direct current, the inverting input terminal of the first operational amplifier 21 is connect by resistance R14 Ground, the first pin of primary side 3 are grounded by capacitor C7, and secondary the first pin of side 5 is grounded by resistance R6.The signal optical coupling isolation circuit In, clamper is divided by the input voltage that D2, D3, R3, R4 and C3 are the first operational amplifier 21, it is defeated to the first operational amplifier 21 Enter end and voltage signal, primary current of the voltage signal through the first operational amplifier 21 control photoelectrical coupler 22, primary side electricity are provided Stream flows to the electric current of D4 by R5, controls isolation voltage signal through primary current.Also, the output of the first operational amplifier 21 It is electrically connected between end and inverting input terminal by the 4th capacitor C4, forms 21 output end of the first operational amplifier and inverting input terminal Between negative-feedback so that the first operational amplifier 21 output it is more accurate.With reference to Fig. 3, optionally, primary side internal components and pair Side internal components are optocoupler diode, it should be noted that primary side internal components and secondary side internal components are also possible to other and rise The device acted on to light-coupled isolation, the present invention are not specifically limited herein.

Optionally, referring to figs. 2 and 3, second switch D2 and third switching tube D3 is diode.

Specifically, the characteristics of forward conduction according to diode reversely ends, first diode D1 can stop in circuit High pressure damages 15V power supply, second switch D2 and third switching tube D3 can clamper be input to the electricity of signal optical coupling isolation circuit 20 Signal is pressed, Line over-voltage is prevented.

Fig. 4 is a kind of schematic diagram of signal processing output circuit provided in an embodiment of the present invention, in above-mentioned technical proposal On the basis of, optionally, with reference to Fig. 4, signal processing output circuit 30 includes signal processing circuit 31 and signal output apparatus 32, letter Number processing circuit 31 and signal output apparatus 32 are electrically connected；

Wherein, signal processing circuit 31 includes the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the 5th capacitor C5, the Two operational amplifiers 33, single-chip microcontroller 34；The non-inverting input terminal of second operational amplifier 33 is electrically connected with the first pin of secondary side, and second The inverting input terminal of operational amplifier 33 is electrically connected with the output end of second operational amplifier 33, second operational amplifier 33 it is defeated Outlet is electrically connected with the first end of the 7th resistance R7, and the second end of the 7th resistance R7 is electrically connected with the first end of the 8th resistance R8, The second end of 8th resistance R8 is grounded, and the first end of the 9th resistance R9 is electrically connected with the first end of the 8th resistance R8, the 9th resistance The second end of R9 is electrically connected with the analog signal input pin 7 of single-chip microcontroller 34, the first end and the 9th resistance R9 of the 5th capacitor C5 Second end electrical connection, the 5th capacitor C5 second end ground connection, 32 pin of analog signal output pin and signal of single-chip microcontroller 34 Output circuit 32 is electrically connected.

Illustratively, in the remote control of argon arc welding machine, the processing of voltage signal can be realized to argon by single-chip microcontroller The control of arc-welding machine operating current, the model of single-chip microcontroller 34 can be IC (48P) STM8L15X, and second operational amplifier 33 can be by 15V power supply power supply, the voltage signal that second operational amplifier 33 exports are inputted by the analog signal input pin 7 of single-chip microcontroller 34 To the inside of single-chip microcontroller 34, single-chip microcontroller 34 A/D conversion can be carried out to voltage signal and D/A is converted, and is drawn by analog signal output 32 output voltage signal of foot.

Optionally, signal output apparatus 32 include third operational amplifier 35, the tenth resistance R10, eleventh resistor R11, The analog signal output pin of the first end of twelfth resistor R12 and thirteenth resistor R13, the tenth resistance R10 and single-chip microcontroller 34 32 electrical connections, the second end of the tenth resistance R10 are electrically connected with the non-inverting input terminal of third operational amplifier 35, third operation amplifier The inverting input terminal of device 35 is grounded by thirteenth resistor R13, and the inverting input terminal of third operational amplifier 35 also passes through the tenth One resistance R11 is electrically connected with the output end of third operational amplifier 35, the output end of third operational amplifier 35 and the 12nd electricity Hinder the first end electrical connection of R12, output end of the second end of twelfth resistor R12 as signal processing output circuit 30.

Specifically, the voltage signal in signal output apparatus 32 is output in external control circuit through R12, pass through adjusting The resistance value size of distal end potentiometer 11 can control the size of current of the output of signal output apparatus 32, control signal output circuit 32 Actually required electric current is exported, realizes remote control and adjusting.

Optionally, single-chip microcontroller 34 is integrated in welding machine.

Wherein, the integrated level small in size of single-chip microcontroller 34 is high, can be integrated in welding machine and carry out in real time to data such as voltage and currents Processing and control, so that welding machine operates normally and completes welding.Also, by adjust the first output end of distal end potentiometer and The control of the output voltage to the single-chip microcontroller being integrated in welding machine may be implemented in voltage swing between second output terminal, realizes Long-range control to welding machine.

Optionally, twelfth resistor R12 is adjustable resistance.

Specifically, the electric current exported by the adjustable signal output apparatus 32 of the resistance value for adjusting twelfth resistor R12, is adjusted The deviation of the adjustable output electric current and actually required electric current of section distal end potentiometer 11, it is adjustable and real to adjust twelfth resistor R12 The output electric current of currents match needed for border.Specifically, by between the first output end of distal end potentiometer and second output terminal The coarse adjustment that electric current is exported to current regulating circuit may be implemented in the adjusting of resistance, by adjusting the resistance value of twelfth resistor R12, The fine tuning for exporting electric current to current regulating circuit may be implemented, so that the electric current of current regulating circuit output is more accurate, improve The accuracy and reliability of current regulating circuit.

Fig. 5 is the structural schematic diagram of another current regulating circuit provided in an embodiment of the present invention, in current regulating circuit Distal end voltage signal generation circuit 10, signal optical coupling isolation circuit 20 and signal processing output circuit 30 connection relationship such as Shown in Fig. 5.

Current regulating circuit provided in this embodiment, including distal end voltage signal generation circuit, signal optical coupling isolation circuit And signal processing output circuit, the high-frequency signal in voltage signal is filtered out by distal end voltage signal generation circuit, reduces line High-frequency Interference in road improves the reliability of circuit.

Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation, It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.