CN209256050U - A kind of arc welder thrust control circuit - Google Patents
A kind of arc welder thrust control circuit Download PDFInfo
- Publication number
- CN209256050U CN209256050U CN201821379501.5U CN201821379501U CN209256050U CN 209256050 U CN209256050 U CN 209256050U CN 201821379501 U CN201821379501 U CN 201821379501U CN 209256050 U CN209256050 U CN 209256050U
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- resistance
- thrust
- circuit
- control circuit
- amplifier
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Abstract
The utility model relates to hand arc welding machine technical fields, disclose a kind of arc welder thrust control circuit, it is arranged in arc welder, including the thrust given circuit coupled with arc welder output end, the adjusting circuit coupled with the output end of thrust given circuit and the control circuit coupled with adjusting circuit, the output end thrust output given voltage of thrust given circuit, thrust given voltage is provided to set output terminal, pass through the adjusting of the duty ratio to pwm signal, the average voltage for keeping thrust output voltage equivalent reduces as pulsewidth increases, realize the combination of digital circuit and analog circuit, both digitlization is able to achieve to adjust, it can guarantee the response speed of circuit again.
Description
Technical field
The utility model relates to hand arc welding machine technical fields, more specifically, it relates to a kind of arc welder thrust
Control circuit.
Background technique
Manual electric arc welding is the arc welding method welded using manual manipulation welding rod, and abbreviation manual metal-arc welding, it is by welding
It connects power supply, welding cable, soldering turret, welding rod and weldment and electric arc and constitutes circuit, when welding uses welding rod and workpiece contact striking
Then electric arc lifts welding rod and keeps certain distance, providing suitable arc voltage and welding current by the source of welding current makes electric arc
Stablize burning, generate high temperature, after welding rod and weldment are locally heated to melting state, welds together after its cooling.
Because arc welder is exactly a special transformer, difference is that voltage declines when transformer connects load
It is small, and voltage decline is big when arc welder connects load, so welding current can decline in manual metal-arc welding work, possibility in this way
Will lead to weldbonding item even current interruption the case where, to avoid such case, it is necessary to increase the push current of arc welding, and
With the application development of hand arc welding machine control circuit, digital circuit using more more and more universal, hand arc welding machine pushes away
Power control circuit and hot striking control technology are realized control by digital microcontroller entirely, and push current can be by manual welding machine sheet
The digitizing tablet of body is adjusted, and there are also the thrust control circuits of manual welding machine to be realized by analog circuit, and panel is by simulation current potential
Device is adjusted, but electricity is simulated in the simple time requirement that can not achieve welding thrust quick response using digital method, simple use
Although circuit response in road is fast, digitlization regulatory function can not achieve, adjusting is inaccurate, and these problems letter is to be solved.
It is excellent that moreover, some manual metal-arc weldings can be had using the Cellulose-Congo red medium of alkalinity, electric arc, fusion penetration is big, penetration power is strong
Point, but will appear unstable electric arc, current interruption or blow-out if push current cannot quickly adjust raising in the welding process
The phenomenon that, cause undesirable technique to influence.
Utility model content
There is a problem of low-response for the adjusting of existing push current or adjusts inaccurate, the purpose of this utility model
It is to provide a kind of arc welder thrust control circuit that there is adjusting and the fast response time that can accurately carry out push current
The advantages of.
To achieve the above object, the utility model provides following technical solution:
A kind of arc welder thrust control circuit, be arranged in arc welder, including with the arc welder output end coupling
The thrust given circuit of conjunction, the adjusting electricity for adjusting thrust output voltage coupled with the output end of the thrust given circuit
Road and the control circuit coupled with the adjusting circuit, the output end thrust output given voltage of the thrust given circuit, control
Circuit processed receives and output pwm signal；
The adjusting circuit include resistance R6 and with the concatenated resistance R7 of the resistance R6 and triode Q1, three pole
The base stage of pipe Q1 is electrically connected with the junction of the resistance R6 and the resistance R7, the collector and the electricity of the triode Q1
It hinders R6 to couple far from one end of the resistance R7, the emitter of the triode Q1 and the resistance R7 are far from the resistance R6's
One end coupling；
It is described to be coupled with resistance R5, the collector coupling of the other end of the resistance R5 and the triode Q1 to set output terminal
It connects；
The base stage of the output end of the control circuit and the triode Q1 couple, and the emitter of the triode Q1 connects
Ground.
Through the above technical solutions, the output end of thrust given circuit provides thrust given voltage, received by control circuit
The pwm signal of adjustable pulse width simultaneously emits level signal, when the base stage of triode Q1 does not receive level signal, at triode Q1
In off state, thrust given voltage is used as by the partial pressure of resistance R6 and resistance R7 and is pushed away via resistance R5, resistance R6 and resistance R7
Power output voltage, when the base stage of triode Q1 receives level signal, triode Q1 enters and is in amplification working condition, PWM
The level signal of the pulse width variations of signal, control circuit output changes correspondingly, and then changes the base current of triode Q1, realizes
The linear regulation of voltage between triode Q1 collector and emitter is passed through in this way, control circuit is digital circuit
Adjusting to the duty ratio of pwm signal changes thrust output voltage with pulse width variations, realizes digital circuit and simulation electricity
The combination on road is not only able to achieve digitlization and adjusts, but also can guarantee the response speed of circuit.
Further, the thrust given circuit includes differential amplifier circuit and is fixed in the arc welder
Battery, the differential amplifier circuit include the first amplifier, and the output end of the battery is same mutually defeated with first amplifier
Enter end coupling, the coupling of the arc welder output end and the inverting input terminal of first amplifier, the output of the battery
For voltage as reference voltage U, described is the output end of first amplifier to set output terminal.
Through the above technical solutions, arc welder is in use, arc welder output end since reference voltage makes certain
The voltage of output reduces, and can be increased under the action of differential amplifier circuit by the thrust given voltage provided to set output terminal, increases
High thrust electric current, avoids current interruption.
Further, the output end of the battery is electrically connected with resistance R1, and the resistance R1 is far from the battery
One end is electrically connected with the non-inverting input terminal for being electrically connected place Yu first amplifier of resistance R2, the resistance R1 and the resistance R2
Electrical connection；
The arc welder output end takes 1/10th of its output voltage to be used as thrust input voltage UFB, the electric arc
Welding terminal is coupled with resistance R3, the one end of the resistance R3 far from the arc welder output end and first amplifier
Inverting input terminal electrical connection；
The inverting input terminal electrical connection of first amplifier hinders R4, and the resistance R4 is electrically connected with the first amplifier output end
It connects.
Through the above technical solutions, due to manual arc welder push current generally the arc welder output end voltage both
Welding arc voltage intervenes when being lower than certain value, therefore uses thrust input voltage UFB compared with reference voltage, so that low in welding arc voltage
When certain value, arc welder thrust control circuit can smoothly apply corresponding current push.
Further, the collector of the triode Q1 is coupled with the filter capacitor C1 of ground connection.
Through the above technical solutions, filter capacitor C1 is for filtering the linear level signal that is delayed.
Further, the filter capacitor C1 is coupled with diode D1 far from one end of ground connection.
Through the above technical solutions, diode D1 can be used for preventing adverse current, play the role of protecting circuit.
Further, the control circuit includes that the second amplifier is coupled with the output end of the control circuit, and described second
The inverting input terminal of amplifier and the base stage of the triode Q1 couple.
Through the above technical solutions, the pwm signal that the second amplifier exports control circuit is isolated with circuit is adjusted, phase is avoided
Mutually influence.
Further, the control circuit further includes low-pass filter circuit, the low-pass filter circuit include resistance R9 and
Filter capacitor C2 is electrically connected with one end of resistance R9, the other end of the resistance R9 is electrically connected with the PWM input terminal, the electricity
The connection for hindering the R9 and filter capacitor C2 is coupled in the non-inverting input terminal of second amplifier.
Through the above technical solutions, the high-frequency harmonic that control circuit exports is filtered out by low-pass filtering, guarantee level letter
Number quality, improve push current adjust precision.
Further, the low-pass filter circuit further includes resistance R10 and the filtered electrical with non-inverting input terminal coupling
Hold C3, one end of the resistance R10 is electrically connected with the resistance R9 far from one end of the PWM input terminal, the resistance R10's
The other end is electrically connected with the non-inverting input terminal.
Through the above technical solutions, the capacitor C3 by selecting certain capacitance, makes the cut-off frequency domain of low-pass filtering more
Accurately, the precision of push current adjusting is further increased.
Further, the inverting input terminal of second amplifier is coupled with resistance R8, and the resistance R8 is far from described second
The base stage of one end of amplifier B and the triode Q1 couple.
Through the above technical solutions, resistance R8 can play the role of partial pressure, convenient for controlling the base voltage of triode Q1, from
And realize the collector voltage of triode Q1.
Compared with prior art, the utility model has the beneficial effects that
(1) thrust regulatory function is realized by using the control technology that number and simulation combine, wherein by control electricity
Road output is received pwm signal by the analog circuit that thrust given circuit and adjusting circuit are constituted and is realized to thrust electricity by pwm signal
The control of the average eguivalent voltage of pressure, to realize the fast, accurately control to push current.
(2) differential amplifier circuit is formed by reference voltage by setting of providing of thrust input voltage and battery,
Make welding arc voltage when lower than certain predetermined value, makes arc welder thrust control circuit that can smoothly apply corresponding electric current and push away
Power, the case where avoiding current interruption, blow-out generation.
(3) by adjusting the pulsewidth of pwm signal, the fast, accurately control to push current makes alkali cellulose welding rod
Welding performance to improve, improve the processing quality of welding.
Detailed description of the invention
Fig. 1 is arc welder thrust electric operation control circuit figure.
Appended drawing reference: 1, thrust given circuit；2, circuit is adjusted；3, control circuit；4, pwm signal；5, the first amplifier；6,
Second amplifier；U0, thrust given voltage；U, reference voltage；UFB, thrust input voltage.
Specific embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
A kind of arc welder thrust control circuit, is fixed in arc welder, as shown in Figure 1, including and arc welding
It the thrust given circuit 1 of machine output end coupling, the adjusting circuit 2 that is coupled with thrust given circuit 1 and is coupled with adjusting circuit 2
Control circuit 3, thrust given circuit 1 receive to 2 thrust output given voltage U0U0 of circuit, control circuit 3 is adjusted and emit arteries and veins
Wide adjustable pwm signal 4 adjusts circuit 2 and receives pwm signal 4, realizes the control for exchanging the thrust voltage of output on economize on electricity road 2.
Wherein, for adjust thrust output voltage adjusting circuit 2 include resistance R6 and with the concatenated resistance R7 of resistance R6
And triode Q1, the base stage of triode Q1 are connected electrically in the junction of resistance R6 and resistance R7, the collector of triode Q1 with
Resistance R6 is coupled far from one end of resistance R7, and the emitter and resistance R7 of triode Q1 is coupled far from one end of resistance R6, and will
The emitter of triode Q1 is grounded, in the other end and triode of output end the coupling resistance R5, resistance R5 of thrust given circuit 1
The collector of Q1 couples, and the output end of control circuit 3 and the base stage of triode Q1 couple,
The output end of thrust given circuit provides thrust given voltage, and the pwm signal of adjustable pulse width is received by control circuit
And emit level signal, when the base stage of triode Q1 does not receive level signal, triode Q1 is in off state, and thrust is given
Constant voltage is via resistance R5, resistance R6 and resistance R7, by the partial pressure of resistance R6 and resistance R7 as thrust output voltage, when three poles
When the base stage of pipe Q1 receives level signal, triode Q1 enters and is in amplification working condition, the at this time change of thrust output voltage
Change is controlled by the voltage between the collector and emitter of triode Q1, changes the pulsewidth of pwm signal, exports control circuit
Level signal increases therewith, then changes the base current of triode Q1, realizes between triode Q1 collector and emitter
Voltage linear conciliation, in this way, control circuit be digital circuit make to push away by the adjusting of the duty ratio to pwm signal
Power output voltage reduces as pulsewidth increases, and realizes the combination of digital circuit and analog circuit, is both able to achieve digitlization and adjusts,
It can guarantee the response speed of circuit again.
Thrust given circuit 1 includes differential amplifier circuit and the battery being fixed in arc welder, and by electric power storage
Pond provides stable 1.5V as reference voltage U, and differential amplifier circuit includes the first amplifier 5, resistance R1, resistance R2, resistance R3
It is electrically connected with the output end of resistance R4, battery with one end of resistance R1, the other end of resistance R1 and the resistance R2 of ground connection are electrically connected
It connects, the junction of resistance R1 and resistance R2 are electrically connected with the non-inverting input terminal of the first amplifier 5, the output end and electricity of the first amplifier 5
One end electrical connection of R4 is hindered, the other end of resistance R4 is electrically connected with the inverting input terminal of the first amplifier 5, one end of resistance R3 and the
The inverting input terminal of one amplifier 5 is electrically connected, and arc welder output end takes 1/10th of its output voltage to be used as thrust input electricity
Press UFB, the one end of input voltage UFB input resistance R3 far from resistance R4.Arc welder output end is welding arc voltage, arc welder
In use, thrust input voltage UFB can reduce with the reduction of welding arc voltage, be computed, and the output end of the first amplifier 5 is made
For thrust given voltage U0, the thrust given voltage U0 and reference voltage U and input voltage UFB meet a kind of proportionate relationship (), as R1=R3 and R2=R4, thrust given voltage U0 be reference voltage U and
K times of input voltage UFB, K be resistance R4 and resistance R3 ratio (), in the present embodiment,
K=10, so that differential amplifier circuit is not involved in when welding arc voltage is higher than 15V, when welding arc voltage is lower than 15V, reference voltage U
It is compared with input voltage UFB, arc welder thrust control circuit 3 can smoothly apply corresponding current push.
Control circuit 3 includes 3 second amplifier 6 of control circuit and low-pass filter circuit, and the homophase input of the second amplifier 6 terminates
Pwm signal 4 is received, the inverting input terminal of the second amplifier 6 and the base stage of triode Q1 couple, the output of 6 control circuit 3 of the second amplifier
Pwm signal 4 is isolated with circuit 2 is adjusted, and avoids influencing each other.
It include high-frequency harmonic in output end to avoid the second amplifier 6,3 low-pass filter circuit of control circuit includes receiving
The resistance R9 of pwm signal 4, be electrically connected with the other end of resistance R9 filter capacitor C2 and resistance R10 and with non-inverting input terminal 05
The filter capacitor C3 of electrical connection, resistance R9 are electrically connected with the junction of filter capacitor C2 with resistance R10, one end of resistance R10 with
Non-inverting input terminal 05 is electrically connected, and is filtered out the high-frequency harmonic that control circuit 3 has by low-pass filtering, is guaranteed the quality of pulse,
The capacitor C2 and capacitor C3 for selecting different capacitances, keep the cut-off frequency domain of low-pass filtering more accurate, improve push current and adjust
Precision.
The inverting input terminal 07 of second amplifier 6 is also electrically connected with resistance R8, the one end of resistance R8 far from the second amplifier 6B with
The base stage of triode Q1 is electrically connected, and resistance R8 can play the role of partial pressure, and level signal is converted into current signal to three poles
The base current of pipe Q1 has an impact, convenient for adjusting the voltage between triode Q1 collector and emitter according to current signal.
The collector of triode Q1 is coupled with the filter capacitor C1 of ground connection, and filter capacitor C1 is for filtering delay linear level
Signal, filter capacitor C1 are coupled with diode D1 far from one end of ground connection, and diode D1 can be used for preventing adverse current, play protection electricity
The effect on road.
The working principle of the utility model is:
The output end thrust output given voltage U0 of first amplifier 5, via resistance R5, resistance R6 and resistance R7, by resistance
The partial pressure of R6 and resistance R7 are as thrust output voltage, and when pwm signal 4 is intervened and carries out pulsewidth modulation, level signal makes three
Pole pipe Q1 is in magnifying state, and thrust output voltage is adjustable at this time, in this way, being used as digital circuit tune by control circuit 3
The size for saving pulsewidth, allows push current by fast and accurate control.
The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the protection scope of the utility model.It should refer to
Out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (9)
1. a kind of arc welder thrust control circuit, be arranged in arc welder, which is characterized in that including with the arc welder
To adjust thrust defeated for the thrust given circuit (1) of output end coupling, being used for of coupling with the output end of the thrust given circuit (1)
The adjusting circuit (2) of voltage and the control circuit (3) coupled with adjusting circuit (2) out, the thrust given circuit (1)
Output end thrust output given voltage (U0), control circuit (3) receives and output pwm signal (4)；
The adjusting circuit (2) include resistance R6 and with the concatenated resistance R7 of the resistance R6 and triode Q1, three pole
The base stage of pipe Q1 is electrically connected with the junction of the resistance R6 and the resistance R7, the collector and the electricity of the triode Q1
It hinders R6 to couple far from one end of the resistance R7, the emitter of the triode Q1 and the resistance R7 are far from the resistance R6's
One end coupling；
The output end of the thrust given circuit (1) is coupled with resistance R5, the other end of the resistance R5 and the triode Q1
Collector coupling；
The output end of the control circuit (3) and the base stage of the triode Q1 couple, the emitter ground connection of the triode Q1.
2. arc welder thrust control circuit according to claim 1, which is characterized in that the thrust given circuit (1)
Including differential amplifier circuit and the battery being fixed in the arc welder, the differential amplifier circuit includes the first fortune
It puts (5), the non-inverting input terminal of the output end of the battery and first amplifier (5) couples, the arc welder output end
It is coupled with the inverting input terminal of first amplifier (5), the output voltage of the battery is described to push away as reference voltage (U)
The output end of power given circuit (1) is the output end of first amplifier (5).
3. arc welder thrust control circuit according to claim 2, which is characterized in that the output end electricity of the battery
It is connected with resistance R1, the resistance R1 is electrically connected with resistance R2, the resistance R1 and the electricity far from one end of the battery
It hinders and is electrically connected at the electrical connection of R2 with the non-inverting input terminal of first amplifier (5)；
The arc welder output end takes 1/10th of its output voltage to be used as thrust input voltage (UFB), the arc welding
Machine output end is coupled with resistance R3, the one end of the resistance R3 far from the arc welder output end and first amplifier (5)
Inverting input terminal electrical connection；
The inverting input terminal of first amplifier (5) is electrically connected with resistance R4, and the resistance R4 is defeated with first amplifier (5)
Outlet electrical connection.
4. arc welder thrust control circuit according to claim 3, which is characterized in that the collector of the triode Q1
It is coupled with the filter capacitor C1 of ground connection.
5. arc welder thrust control circuit according to claim 4, which is characterized in that the filter capacitor C1 is separate to be connect
The one end on ground is coupled with diode D1.
6. arc welder thrust control circuit according to claim 2, which is characterized in that the control circuit (3) includes
Second amplifier (6), the non-inverting input terminal of second amplifier (6) receive the pwm signal (4), second amplifier (6) it is anti-
The base stage of phase input terminal and the triode Q1 couple.
7. arc welder thrust control circuit (3) according to claim 6, which is characterized in that the control circuit (3) is also
Including low-pass filter circuit, the low-pass filter circuit includes resistance R9 and the filtered electrical that is electrically connected with one end of the resistance R9
Hold C2, the other end of the resistance R9 receives the pwm signal (4), the junction of the resistance R9 and the filter capacitor C2
It is coupled with the non-inverting input terminal of second amplifier (6).
8. arc welder thrust control circuit according to claim 7, which is characterized in that the low-pass filter circuit also wraps
Resistance R10 and the filter capacitor C3 with non-inverting input terminal coupling are included, one end of the resistance R10 and the resistance R9 are separate
One end of the pwm signal (4) is electrically connected, and the other end of the resistance R10 is electrically connected with the non-inverting input terminal.
9. arc welder thrust control circuit according to claim 8, which is characterized in that second amplifier (6) it is anti-
Phase input terminal is coupled with resistance R8, the base stage of the resistance R8 one end far from second amplifier (6) and the triode Q1
Coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821379501.5U CN209256050U (en) | 2018-08-24 | 2018-08-24 | A kind of arc welder thrust control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821379501.5U CN209256050U (en) | 2018-08-24 | 2018-08-24 | A kind of arc welder thrust control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209256050U true CN209256050U (en) | 2019-08-16 |
Family
ID=67551845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821379501.5U Expired - Fee Related CN209256050U (en) | 2018-08-24 | 2018-08-24 | A kind of arc welder thrust control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209256050U (en) |
-
2018
- 2018-08-24 CN CN201821379501.5U patent/CN209256050U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190816 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |