CN112792434A - Self-adaptive welding machine characteristic control circuit - Google Patents
Self-adaptive welding machine characteristic control circuit Download PDFInfo
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- CN112792434A CN112792434A CN202011609149.1A CN202011609149A CN112792434A CN 112792434 A CN112792434 A CN 112792434A CN 202011609149 A CN202011609149 A CN 202011609149A CN 112792434 A CN112792434 A CN 112792434A
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- 238000003466 welding Methods 0.000 title claims abstract description 67
- 230000003321 amplification Effects 0.000 claims description 22
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 22
- 230000003044 adaptive effect Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 101100508412 Caenorhabditis elegans ifb-2 gene Proteins 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
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Abstract
The invention discloses a self-adaptive welding machine characteristic control circuit, which realizes the effect of automatic matching of thrust current and welding current by setting a control bus associated with a welding current given signal. The voltage of the control bus is related to the output voltage of the thrust generation circuit, the output voltage of the thrust adjusting circuit and the output voltage of the self-adaptive control circuit, the thrust generation circuit outputs a thrust control signal according to the output voltage of the welding machine, the thrust adjusting circuit controls the maximum value of the bus voltage in a clamping mode according to the thrust given circuit, the self-adaptive control circuit controls the maximum value of the bus voltage according to the clamping mode of the welding current, and meanwhile, the self-adaptive circuit automatically adjusts the maximum value of the hot arcing control signal to achieve self-adaptive matching of the hot arcing current.
Description
Technical Field
The invention relates to the technical field of welding machine control, in particular to a self-adaptive welding machine characteristic control circuit.
Background
At present, an electric arc welding machine is a common engineering tool, the control mode of the existing manual electric arc welding machine on thrust and hot arc striking is simple, the size of the thrust and the hot arc striking can only be adjusted according to electric arc voltage, and the size values of the thrust and the hot arc striking are not in linkage matching with welding specifications. The use is not convenient, and the operation effect is not good.
The existing welding machine is usually in an open-loop state when in no-load, the maximum pulse width is output, and the short-circuit impact current during arc striking is larger, so that the reliability of an inverter power device is influenced.
Therefore, how to improve the linkage control of thrust and thermal arc striking and reduce the instantaneous current impact of arc striking of the welding machine is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a self-adaptive welding machine characteristic control circuit, which realizes the effect of automatic matching of thrust current and welding current by setting a 'control bus' associated with a welding current given signal. The voltage of the control bus is related to the output voltage of the thrust generation circuit, the output voltage of the thrust adjusting circuit and the output voltage of the self-adaptive control circuit, the thrust generation circuit outputs a thrust control signal according to the output voltage of the welding machine, the thrust adjusting circuit provides the maximum value of the circuit clamping control bus voltage according to the thrust, the self-adaptive control circuit sets the maximum value of the clamping control bus voltage according to the welding current, and meanwhile, the self-adaptive circuit automatically adjusts the maximum value of the thermal arcing control signal to achieve self-adaptive matching of the thermal arcing current.
The above object of the present invention is achieved by the following technical solutions:
a self-adaptive welding machine characteristic control circuit comprises a welding current setting circuit, a thrust generation and adjustment circuit, a hot arcing control circuit, a self-adaptive control circuit, a signal operation circuit and a PWM (pulse width modulation) circuit, wherein the welding current setting circuit, the thrust generation and adjustment circuit, the hot arcing control circuit and the self-adaptive control circuit are connected with the signal operation circuit, and the signal operation circuit is connected with the PWM circuit; the welding current setting circuit and the thermal arcing control circuit are also respectively connected with the self-adaptive control circuit; the welding current given circuit is used for outputting a welding current given value; the thrust generation and regulation circuit is used for outputting a thrust control signal according to the output voltage feedback signal and the thrust set value; the hot arcing control circuit is used for outputting a hot arcing control signal according to the output current feedback signal; and the signal operation circuit is used for performing operation according to the welding current set value, the thrust control signal and the hot arcing control signal, and outputting an operation result to the PWM (pulse width modulation) circuit for pulse width regulation.
The invention is further configured to: the input end of the PI error amplifying circuit is connected with the output of the signal operation circuit, the output end of the PI error amplifying circuit is connected with the PWM pulse width modulation circuit, and the PI error amplifying circuit is used for amplifying the operation result of the signal operation circuit and outputting a PWM adjusting signal to the PWM pulse width modulation circuit.
The invention is further configured to: the input end of the no-load closed-loop control circuit is connected with the hot arcing control circuit, the output end of the no-load closed-loop control circuit is connected with the output end of the PI error amplification circuit, and the no-load closed-loop control circuit is used for outputting a no-load closed-loop control signal to the PI error amplification circuit according to the hot arcing control signal and the output voltage feedback signal.
The invention is further configured to: the no-load closed-loop control circuit comprises a closed-loop comparison circuit, and is used for summing the output voltage feedback signal and the thermal arcing control signal, comparing the sum with a fourth set value, and outputting a comparison result to the PI error amplification circuit.
The invention is further configured to: the PI error amplifying circuit comprises an inverting amplifying circuit, and is used for summing an output current feedback signal, an operation result of the signal operation circuit and a no-load closed-loop control signal, then performing inverting amplification, and outputting a PWM (pulse width modulation) adjusting signal.
The invention is further configured to: and the minimum pulse width limiting circuit is also included, and the output of the minimum pulse width limiting circuit is connected with the input of the PWM circuit and is used for providing the minimum pulse width and preventing the output pulse width of the PWM circuit from being too narrow.
The invention is further configured to: the minimum pulse width limiting circuit comprises a fifth set value setting circuit for providing a minimum threshold value for the PWM circuit; the PWM circuit comprises a pulse width modulation chip and is used for outputting a PWM voltage regulating value and outputting a voltage feedback signal according to the PWM regulating signal and the minimum threshold value.
The invention is further configured to: the thrust generating and adjusting circuit comprises a thrust generating circuit and a thrust adjusting circuit, and the thrust adjusting circuit comprises a thrust setting circuit and is used for outputting a thrust set value; the thrust generation circuit comprises a reverse amplification circuit and is used for outputting a thrust control signal according to a thrust threshold and an output voltage feedback signal and outputting a thrust set value and a thrust control signal to the signal operation circuit.
The invention is further configured to: the hot arcing control circuit comprises a comparison circuit, a first setting value and a second setting value, wherein the comparison circuit is used for comparing the output current feedback signal with the third setting value and outputting a hot arcing control signal according to a comparison result; the self-adaptive control circuit comprises an inverting amplifying circuit and is used for adjusting the size of a self-adaptive control signal according to a welding current set value, the output size of the clamping hot arcing control circuit and the input size of the signal operation circuit.
The invention is further configured to: the signal operation circuit comprises an inverse adder circuit and is used for summing and inverting the thermal arcing control signal, the welding current set value, the thrust generation and adjustment signal and the self-adaptive control signal.
Compared with the prior art, the beneficial technical effects of this application do:
1. the control bus is arranged, so that the output voltage of the thrust generation circuit, the output voltage of the thrust adjusting circuit and the output voltage of the self-adaptive control circuit are connected together, and the automatic matching of the thrust current and the welding circuit is realized;
2. furthermore, the self-adaptive matching of the hot arc striking current is realized through the self-adaptive control circuit and the output of the no-load closed-loop control circuit clamping hot arc striking circuit;
3. furthermore, the control bus voltage, the welding current voltage and the hot arcing control voltage are subjected to summation and amplification operation, and control of parameters in multiple aspects on the control pulse width is realized.
Drawings
FIG. 1 is a block diagram of a control circuit configuration according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a control circuit configuration according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a thrust producing and conditioning circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an adaptive control circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a signal operation circuit according to an embodiment of the present application;
FIG. 6 is a schematic diagram of an unloaded closed loop control circuit according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a PI error amplification circuit according to an embodiment of the present application;
fig. 8 is a schematic diagram of a PWM modulation circuit according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed description of the preferred embodiment
The application discloses a self-adaptation welding machine characteristic control circuit, as shown in FIG. 1, includes: the device comprises a welding current setting circuit, a thrust generation and regulation circuit, a hot arcing control circuit, a self-adaptive control circuit, a signal operation circuit and a PWM (pulse width modulation) circuit.
The output of the welding current given circuit, the output of the thrust generation and regulation circuit, the output of the thermal arcing control circuit and the output of the self-adaptive control circuit are connected with the input of the signal operation circuit, and the signal operation circuit is used for carrying out summation and phase inversion operation according to the welding current given value, the thrust control signal and the thermal arcing control signal and outputting an operation result.
One output of the self-adaptive control circuit and the output of the thrust generation and adjustment circuit are connected to a control bus, and the self-adaptive control circuit and the output of the thrust generation and adjustment circuit are connected to a first input end of the signal operation circuit through the control bus.
The welding current given circuit is used for outputting a welding current given value, and the output of the welding current given circuit is connected with the input of the signal self-adaptive control circuit and the second input end of the signal operation circuit and is used for adjusting the self-adaptive control signal according to the welding current given signal.
The hot arcing control circuit is used for outputting a hot arcing control signal according to the output current feedback signal; the output of which is connected to the third input terminal of the signal arithmetic circuit.
One input of the PI error amplifying circuit is connected with the output of the signal operation circuit, the other input of the PI error amplifying circuit is connected with the output feedback current end, the output of the PI error amplifying circuit is connected with the PWM pulse width modulation circuit, and the PI error amplifying circuit is used for summing and amplifying the operation result of the signal operation circuit and the output feedback current signal and outputting a PWM pulse width modulation signal.
The PWM circuit outputs a PWM signal according to the PWM signal.
Detailed description of the invention
The characteristic control circuit of the self-adaptive welding machine is different from the first embodiment in that the characteristic control circuit further comprises an unloaded closed-loop control circuit,
the second output of the hot arcing control circuit is connected to one input end of the no-load closed-loop control circuit; and the other input end of the no-load closed-loop control circuit is connected with an output feedback voltage end, and the output end of the no-load closed-loop control circuit is connected with the third input end of the PI error amplifying circuit.
And the no-load closed-loop control circuit is used for carrying out summation amplification operation on the output feedback voltage signal and the thermal arcing control signal to obtain a no-load closed-loop control signal and sending the no-load closed-loop control signal to the PI error amplification circuit.
And the PI error amplifying circuit performs summation and phase inversion operation on the operation result of the signal operation circuit, the output feedback current signal and the no-load closed-loop control signal to obtain a PWM (pulse width modulation) signal.
In another embodiment of the present application, the PWM circuit further comprises a minimum pulse width limiting circuit, an output of which is connected to an input of the PWM circuit, and an input of which is an output terminal of the voltage setting circuit, for providing a minimum voltage to the PWM circuit, so as to prevent the PWM signal output by the PWM circuit from having too narrow pulse width.
Detailed description of the preferred embodiment
The thrust generation and regulation circuit of the self-adaptive welding machine characteristic control circuit comprises a thrust generation circuit and a thrust regulation circuit, and the output of the thrust generation and regulation circuit is connected to a control bus, as shown in figures 2 and 3.
The thrust generation circuit comprises an amplifying circuit U1A, wherein a positive input end of the amplifying circuit U1A is connected with a first voltage setting end and used for providing a first setting voltage, and thrust is generated when the first setting voltage is lower than the first setting voltage.
In this embodiment, the first set voltage end is formed by connecting a resistor R4 and a voltage regulator tube Z1 in series, the other end of the resistor R4 is connected to the power supply, the other end of the voltage regulator tube Z1 is grounded, and the connection point of the resistor R4 and the voltage regulator tube Z1 is connected to the positive input end of the amplifying circuit U1A.
The negative input terminal of the amplifying circuit U1A is connected to the output feedback voltage terminal UFB1 through a resistor R2 and to the output terminal thereof through a resistor R1. The output end of the diode D1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with one end of the resistor R5 and one end of the resistor R3, the other end of the resistor R5 is grounded, and the other end of the resistor R3 is connected with the control bus.
The thrust generation circuit is an inverting amplification circuit, when the output feedback voltage 'UFB 1' is higher than a first set voltage, the operational amplifier U1A outputs a negative potential, the diode D1 is cut off, the circuit does not generate a thrust control signal at the moment, and the welding machine outputs no thrust current; when the output feedback voltage 'UFB 1' is lower than the first set voltage, the output of the operational amplifier U1A becomes positive, the diode D1 is turned on, the thrust control signal is applied to the control bus via D1 and R14, and the thrust current is generated after the operation of the signal operation circuit.
Due to the negative feedback resistor R1, the lower the voltage of the UFB1 is, the higher the output voltage of the amplifying circuit U1A is, and the larger the thrust control signal is.
The thrust adjusting circuit comprises a second voltage setting circuit and a first follower circuit, the second voltage setting circuit is composed of a variable resistor VR1, one end of a variable resistor VR1 is connected with a power supply, the other end of the variable resistor VR 3526 is grounded, the adjustable end of the variable resistor VR1 is connected with the positive input end of an amplifying circuit U1B through a resistor R8, the negative input end and the output end of the amplifying circuit U1B are connected together and connected with the negative electrode of a diode D4, and the positive electrode of the diode D4 is connected with a control bus.
The thrust regulating circuit outputs a voltage between 0 and 5V according to the input voltage, and the voltage clamps the thrust control signal output by the amplifying circuit U1A through a diode D4, namely, the magnitude of the thrust given signal can be controlled in a range of 0 to 5V by regulating a thrust potentiometer VR 1.
Detailed description of the invention
The application discloses an adaptive circuit of an adaptive welding machine characteristic control circuit, as shown in fig. 2 and 4, the adaptive circuit is an inverting amplifying circuit and comprises an amplifying circuit U1C and a peripheral circuit thereof, a negative input end of the amplifying circuit U1 is connected with a negative power supply end through a resistor R12, an output end of a welding current given circuit is connected through a resistor R18, an output end of the welding current given circuit is connected through a resistor R11, a positive input end of the amplifying circuit is grounded, an output end of the amplifying circuit is connected with a negative end of a diode D5 and one end of a thermal arcing control circuit, and a positive end of D5 is connected with a control bus.
When the welding current set value is increased, the lower the output voltage of the amplifying circuit U1C is, the lower the voltage on the control bus is pulled down through the diode D5 by adding R18 to the inverting input of the amplifying circuit U1C, and the voltage on the control bus is clamped at the output voltage of the amplifying circuit U1C by neglecting the voltage drop of the diode. The voltage on the control bus is adaptively matched with the voltage according to the welding current.
The output of the adaptive circuit clamps the maximum output value of the hot arcing control circuit.
The welding current setting circuit is a voltage division circuit and comprises resistors R17/VR2/R22 which are connected in series, wherein VR2 is an adjustable resistor, an adjustable end of the adjustable resistor outputs a welding current setting value through a resistor R20, and the other end of the resistor R20 is an output end of the welding current setting circuit and is connected with a second input end of the signal operation circuit.
One end of the series combination of the resistors R17/VR2/R22 is connected with a power supply, and the other end is grounded.
And the adjustment of the set value of the welding current is realized by adjusting the adjustable resistor VR 2.
The hot arcing control circuit comprises a comparison circuit and a charging circuit, the comparison circuit comprises an operational amplifier U4C and a peripheral circuit, the negative input end of the operational amplifier U4C is connected with an output feedback current end IFB2, the positive input end of the operational amplifier U4C is connected with a third set value end, the third set voltage end is formed by connecting a resistor R31 and a voltage regulator tube Z4 in series, the other end of the resistor R31 is connected with a power supply, the other end of the voltage regulator tube Z4 is grounded, and the connection point of the resistor R31 and the voltage regulator tube Z4 is connected with the positive input end of an amplifying circuit U4C.
The output of the operational amplifier U4C is connected to one input end of the no-load closed-loop control circuit and one end of the resistor R29, the other end of the resistor R29 is connected to one end of the charging capacitor C8, the positive end of the diode D10 and the positive end of the diode D8, the negative end of the diode D10 is connected to the third input end of the signal operation circuit, and the negative end of the diode D8 is connected to the output end of the adaptive control circuit.
When the welder is unloaded, namely no load has no output current, the IFB2 end is 0V, the operational amplifier U4C outputs high level, the charging capacitor C8 is charged through the resistor R29, when the welder is started, a welding rod is contacted with a workpiece to generate welding current, the voltage at the IFB2 end is not 0, when the voltage at the IFB2 end is larger than a third set value, the operational amplifier U4C outputs level inversion, low level is output, the voltage at the capacitor C8 is discharged through the R29 and the U4C, a discharging curve is determined by parameters of R29 and C8, and the voltage at the C8 is applied to a third input end of the signal operational circuit U1D through the adjustable resistor VR3 to participate in current setting operation.
Detailed description of the preferred embodiment
The application discloses a signal arithmetic circuit of self-adaptation welding machine characteristic control circuit, as shown in fig. 2, 5, signal arithmetic circuit is the inverting summation circuit, including operational amplifier circuit U1D, operational amplifier circuit U1D's negative input end passes through resistance R14 and connects the control bus, give the output of circuit through resistance R19 connection welding current, connect an output of hot arcing control circuit through adjustable resistance VR3, the one end of resistance R15, another termination output of resistance R15.
The operational amplifier circuit U1D has a positive input terminal grounded and an output terminal serving as an output terminal of the signal operational circuit.
The operational amplification circuit U1D performs inverse addition operation on the thrust generation and adjustment signal on the control bus, the self-adaptive control signal, the welding current set value and the thermal arcing control signal, and outputs the operation result to one input end of the PI error amplification circuit.
Detailed description of the preferred embodiment
The utility model provides a no-load closed loop control circuit of self-adaptation welding machine characteristic control circuit, as shown in fig. 2, 6, no-load closed loop control circuit is amplifier circuit, including operational amplifier U4B, the positive input end of operational amplifier U4B connects the output of hot arcing control circuit through forward connecting diode D11, connect output feedback voltage end UFB2 through resistance R30, the negative input end of operational amplifier U4B connects the tie point of resistance R25/R27 series combination, connect its output through resistance R26, the third input of PI error amplifier circuit is connected to its output after the series combination of its output through forward diode D9, resistance R28.
The resistor R25/R27 in series combination is used to give a fourth set point.
The voltage of the output feedback voltage end UFB2 is proportional to the pulse width of the PWM signal, when the voltage on UFB2 is smaller than the fourth set value, the output of operational amplifier U4B is in low level state, diode D9 is turned off, when the voltage on UFB2 is greater than or equal to the fourth set value, operational amplifier U4B is turned over to enter amplification state, outputs positive voltage, diode D9 is turned on, and is added to the PI error amplification circuit through resistor R28.
Detailed description of the preferred embodiment
The PI error amplifying circuit of the self-adaptive welding machine characteristic control circuit comprises an operational amplifier U4A and a peripheral circuit, wherein the positive input end of the operational amplifier U4A is grounded, the negative input end of the operational amplifier U4A is connected with the negative electrode of a diode D6, the positive electrode of a diode D7, one end of a resistor R16, one end of a resistor R23 and the output end of a no-load closed-loop control circuit; the other end of the resistor R16 is connected with the output end of the operational amplifier circuit, and the other end of the resistor R23 is connected with the output feedback current end IFB 2.
And a parallel circuit is connected between the negative input end and the output end, and comprises a capacitor C4/C5/a resistor R13, wherein the capacitor C5 is connected with the resistor R13 in series and then is connected with the capacitor C4 in parallel.
The output end of the PI error amplifying circuit is led out of the output end of the PI error amplifying circuit through a resistor R21, and a PWM control signal is output.
The voltage of the feedback circuit end IFB2 is a positive value, the operation result output by the signal operation circuit is a negative value, and the output of the PI error amplification circuit is used for adjusting the width of PWM.
Detailed description of the preferred embodiment
The PWM pulse width modulation circuit of the adaptive welding machine characteristic control circuit comprises a chip U2, the output of a PI error amplification circuit is connected to a first input pin of the chip U2 after passing through a forward diode D3, and the higher the output voltage of the PI error amplification circuit is, the wider the pulse width output by the chip U2 is. The welder output circuit is proportional to the output pulse width of the chip U2, so controlling the pulse width controls the output current.
The minimum pulse width limiting circuit comprises an operational amplifier U3, wherein the operational amplifier U3 is set as a follower circuit, the positive input end of the operational amplifier U3 is connected with a fifth setting circuit, the fifth setting voltage end is formed by connecting a resistor R6 and a voltage regulator tube Z2 in series, the other end of the resistor R6 is connected with a power supply, the other end of the voltage regulator tube Z2 is grounded, and the connection point of the resistor R6 and the voltage regulator tube Z2 is connected with the positive input end of the amplifying circuit U3. An output terminal of the amplifying circuit U3 is connected to a first input pin of the chip U2 through a forward diode D2.
The minimum pulse width limiting circuit is used for outputting a fifth set value to a first input pin of the chip U2, and the influence on the reliability of a main loop of the inverter welding machine due to the fact that the pulse width output by the chip U2 is too narrow and even wave loss is avoided when the output voltage of the PI error amplifier is too low.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A self-adaptive welding machine characteristic control circuit is characterized in that: the welding current setting circuit, the thrust generating and adjusting circuit, the hot arcing control circuit, the self-adaptive control circuit, the signal operation circuit and the PWM (pulse width modulation) circuit are connected with the signal operation circuit, and the signal operation circuit is connected with the PWM circuit; the welding current setting circuit and the thermal arcing control circuit are also respectively connected with the self-adaptive control circuit; the welding current given circuit is used for outputting a welding current given value; the thrust generation and regulation circuit is used for outputting a thrust control signal according to the output voltage feedback signal and the thrust set value; the hot arcing control circuit is used for outputting a hot arcing control signal according to the output current feedback signal; and the signal operation circuit is used for performing operation according to the welding current set value, the thrust control signal and the hot arcing control signal, and outputting an operation result to the PWM (pulse width modulation) circuit for pulse width regulation.
2. The adaptive welder characteristic control circuit of claim 1, wherein: the input end of the PI error amplifying circuit is connected with the output of the signal operation circuit, the output end of the PI error amplifying circuit is connected with the PWM pulse width modulation circuit, and the PI error amplifying circuit is used for amplifying the operation result of the signal operation circuit and outputting a PWM adjusting signal to the PWM pulse width modulation circuit.
3. The adaptive welder characteristic control circuit of claim 2, wherein: the input end of the no-load closed-loop control circuit is connected with the hot arcing control circuit, the output end of the no-load closed-loop control circuit is connected with the output end of the PI error amplification circuit, and the no-load closed-loop control circuit is used for outputting a no-load closed-loop control signal to the PI error amplification circuit according to the hot arcing control signal and the output voltage feedback signal.
4. The adaptive welder characteristic control circuit of claim 3, wherein: the no-load closed-loop control circuit comprises a closed-loop comparison circuit, and is used for summing the output voltage feedback signal and the thermal arcing control signal, comparing the sum with a fourth set value, and outputting a comparison result to the PI error amplification circuit.
5. The adaptive welder characteristic control circuit of claim 3, wherein: the PI error amplifying circuit comprises an inverting amplifying circuit, and is used for summing an output current feedback signal, an operation result of the signal operation circuit and a no-load closed-loop control signal, then performing inverting amplification, and outputting a PWM (pulse width modulation) adjusting signal.
6. The adaptive welder characteristic control circuit of claim 1, wherein: and the minimum pulse width limiting circuit is also included, and the output of the minimum pulse width limiting circuit is connected with the input of the PWM circuit and is used for providing the minimum pulse width and preventing the output pulse width of the PWM circuit from being too narrow.
7. The adaptive welder characteristic control circuit of claim 6, wherein: the minimum pulse width limiting circuit comprises a fifth set value setting circuit for providing a minimum threshold value for the PWM circuit; the PWM circuit comprises a pulse width modulation chip and is used for outputting a PWM voltage regulating value and outputting a voltage feedback signal according to the PWM regulating signal and the minimum threshold value.
8. The adaptive welder characteristic control circuit of claim 1, wherein: the thrust generating and adjusting circuit comprises a thrust generating circuit and a thrust adjusting circuit, and the thrust adjusting circuit comprises a thrust setting circuit and is used for outputting a thrust set value; the thrust generation circuit comprises a reverse amplification circuit and is used for outputting a thrust control signal according to a thrust threshold and an output voltage feedback signal and outputting a thrust set value and a thrust control signal to the signal operation circuit.
9. The adaptive welder characteristic control circuit of claim 1, wherein: the hot arcing control circuit comprises a comparison circuit, a first setting value and a second setting value, wherein the comparison circuit is used for comparing the output current feedback signal with the third setting value and outputting a hot arcing control signal according to a comparison result; the self-adaptive control circuit comprises an inverting amplifying circuit and is used for adjusting the size of a self-adaptive control signal according to a welding current set value, the output size of the clamping hot arcing control circuit and the input size of the signal operation circuit.
10. The adaptive welder characteristic control circuit of claim 1, wherein: the signal operation circuit comprises an inverse adder circuit and is used for summing and inverting the thermal arcing control signal, the welding current set value, the thrust generation and adjustment signal and the self-adaptive control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011609149.1A CN112792434A (en) | 2020-12-30 | 2020-12-30 | Self-adaptive welding machine characteristic control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011609149.1A CN112792434A (en) | 2020-12-30 | 2020-12-30 | Self-adaptive welding machine characteristic control circuit |
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| Publication Number | Publication Date |
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| CN112792434A true CN112792434A (en) | 2021-05-14 |
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|---|---|---|---|
| CN202011609149.1A Pending CN112792434A (en) | 2020-12-30 | 2020-12-30 | Self-adaptive welding machine characteristic control circuit |
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- 2020-12-30 CN CN202011609149.1A patent/CN112792434A/en active Pending
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