CN108710317A - Cutting machine output control system and method - Google Patents
Cutting machine output control system and method Download PDFInfo
- Publication number
- CN108710317A CN108710317A CN201810285076.1A CN201810285076A CN108710317A CN 108710317 A CN108710317 A CN 108710317A CN 201810285076 A CN201810285076 A CN 201810285076A CN 108710317 A CN108710317 A CN 108710317A
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- resistance
- cutting machine
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- diode
- capacitance
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- 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
- B23K10/00—Welding or cutting by means of a plasma
-
- 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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
Abstract
The present invention provides a kind of cutting machine output control systems, including signal sample circuit, signal conditioning circuit and microcontroller；Signal sample circuit acquires cutting machine load current signal；Signal conditioning circuit improves collected cutting machine load current signal, generates control signal；Microcontroller：Judge whether cutting machine is in normal cut state according to control signal, if it is determined that being in normal cut state, then persistently exports PWM；If it is determined that in abnormal cut state, then PWM is turned off.Correspondingly, the present invention also provides a kind of cutting machine output control methods.The present invention can control the output of cutting machine according to the difference of cutting machine cut state, can effectively improve the efficiency of cutting.
Description
Technical field
The present invention relates to cutting machine fields, and in particular, to a kind of cutting machine output control system and method.
Background technology
In recent years, it flourishes as the country is manufacturing, cutting machine is applied to more and more workplaces, this is right
The cutting efficiency of cutting machine, the safety of cut quality and cutting machine, intelligent more stringent requirements are proposed.In cutting machine
Classification in, plasma cutting machine is a kind of cutting method being most widely used at present, since the eighties in last century, wait from
Son cutting electromechanical source progresses into the epoch of contravariant plasma cutting power supply.But current cutting machine control unit is come
It says, there is not in time, being in turn resulted in load condition judgement, cutting effect is bad, causes security risk to lack operating personnel
It falls into.
Invention content
For the defects in the prior art, the object of the present invention is to provide a kind of cutting machine output control system and methods.
According to cutting machine output control system provided by the invention, including signal sample circuit, signal conditioning circuit and
Microcontroller；
Signal sample circuit acquires cutting machine load current signal；
Signal conditioning circuit improves collected cutting machine load current signal, generates control signal；
Microcontroller：Judge whether cutting machine is in normal cut state according to control signal, if it is determined that in normal cutting
State then persistently exports PWM；If it is determined that in abnormal cut state, then PWM is turned off.
Preferably, the signal sample circuit includes sampling transformer T2；
The input terminal for sampling transformer T2 constitutes main transformer input series connection end；
One end of the output end of sampling transformer T2 is connected to signal adjustment circuit, samples the another of the output end of transformer T2
One end is grounded.
Preferably, the signal conditioning circuit includes resistance R5, resistance R6, resistance R7, resistance R8, diode D4, capacitance
C5 and voltage comparator U1；
One end of the output end of one end connection sampling transformer T2 of resistance R5, the other end ground connection of resistance R5；Diode
One end of the output end of the anode connection sampling transformer T2 of D4, one end of the cathode connection resistance R6 of diode D4；Resistance R6
The other end be separately connected the normal phase input end of one end of resistance R7, one end of capacitance C5 and voltage comparator U1；Resistance R7
The other end of the other end and capacitance C5 be grounded；The inverting input of voltage comparator U1 connect with output end after with resistance R8
One end connection；The other end of resistance R8 is connected to the AD mouths of microcontroller.
Preferably, also include rectifying output circuit：Rectification and output are carried out to cutting machine load current.
Preferably, rectifying output circuit includes main transformer T1, resistance R1, resistance R2, resistance R3, resistance R4, diode
D1, diode D2, diode D3, capacitance C1, capacitance C2, capacitance C3, capacitance C4, inductance L1；
The input terminal of main transformer T1 is connected with the input terminal of sampling transformer T2；One end of the output end of main transformer T1
It is separately connected the anode of one end and diode D1 of capacitance C1；One end of the other end connection resistance R1 of capacitance C1；Resistance R1's
The other end is separately connected the cathode of diode D1, one end of resistance R2, the cathode of diode D2, the cathode of diode D3, resistance
One end of R3, input anode are simultaneously picked shell by capacitance C3；One end of the other end connection capacitance C2 of resistance R2；C2's is another
End, the anode of diode D2, diode D3 anode be connected to main transformer T1 output end the other end；Resistance R3's is another
One end connects one end of resistance R4；The other end of the output end of one end connection main transformer T1 of inductance L1；Inductance L1's is another
End, resistance R4 the other end be all connected with input cathode and picked shell by capacitance C4.
Preferably, also include driving circuit, the cutting machine load includes IGBT；Microcontroller, driving circuit, IGBT, master
Transformer T1 is sequentially connected；The pwm signal that microcontroller generates drives IGBT through overdrive circuit.
The present invention also provides a kind of cutting machine output control methods, comprise the steps of：
Step S1：Acquire cutting machine load current signal；
Step S2：Collected cutting machine load current signal is improved, control signal is generated；
Step S3：Judge whether cutting machine is in normal cut state according to control signal, if it is determined that in normal cutting
State then persistently exports PWM；If it is determined that in abnormal cut state, then PWM is turned off.
Compared with prior art, the present invention has following advantageous effect：
1, the present invention can control the output of cutting machine, can effectively improve according to the difference of cutting machine cut state
The efficiency of cutting；
2, whether microcontroller can judge cutting machine in abnormal according to the size of the current signal collected in the present invention
State automatically shuts down PWM when judgement is in abnormality, and user is made to obtain safer guarantee, reduces maloperation risk；
3, the invention enables the cutting machine starting the arc control it is more accurate while easy to automate, be applied to automatic metaplasia
Production.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the circuit for acquiring cutting machine load current signal in the present invention；
Fig. 2 is the circuit for improving cutting machine current signal in the present invention；
Fig. 3 is that microcontroller of the present invention judges cut state, the schematic diagram of control PWM outputs.
Specific implementation mode
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
In the description of the present invention, it is to be understood that, term "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on ... shown in the drawings or position
Relationship is set, is merely for convenience of description of the present invention and simplification of the description, device is not indicated or implied the indicated or element is necessary
With specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
Cutting machine output control system provided by the invention, including signal sample circuit, signal conditioning circuit and monolithic
Machine；Signal sample circuit acquires cutting machine load current signal；Signal conditioning circuit, to collected cutting machine load current
Signal is improved, and control signal is generated；Microcontroller：Judge whether cutting machine is in normal cut state according to control signal,
If it is determined that being in normal cut state, then PWM is persistently exported；If it is determined that in abnormal cut state, then PWM is turned off.
As shown in Figure 1, the signal sample circuit includes sampling transformer T2；The input terminal for sampling transformer T2 constitutes master
Become input series connection end, that is to say, that the input terminal phase of the input terminal and the main transformer T1 hereinafter mentioned of sampling transformer T2
Connection；One end of the output end of sampling transformer T2 is connected to signal adjustment circuit, samples the another of the output end of transformer T2
End ground connection.As shown in Fig. 2, the signal conditioning circuit includes resistance R5, resistance R6, resistance R7, resistance R8, diode D4, electricity
Hold C5 and voltage comparator U1；One end of the output end of one end connection sampling transformer T2 of resistance R5, resistance R5's is another
End ground connection；One end of the output end of the anode connection sampling transformer T2 of diode D4, the cathode connection resistance R6 of diode D4
One end；The other end of resistance R6 is separately connected the positive of one end of resistance R7, one end of capacitance C5 and voltage comparator U1
Input terminal；The other end of resistance R7 and the other end of capacitance C5 are grounded；The inverting input and output end of voltage comparator U1
It is connect with one end of resistance R8 after connection；The other end of resistance R8 is connected to the AD mouths of microcontroller.
Preferably, cutting machine output control system also includes rectifying output circuit：Rectification is carried out to cutting machine load current
With output.As shown in Figure 1, rectifying output circuit includes main transformer T1, resistance R1, resistance R2, resistance R3, resistance R4, two poles
Pipe D1, diode D2, diode D3, capacitance C1, capacitance C2, capacitance C3, capacitance C4, inductance L1；
The input terminal of main transformer T1 is connected with the input terminal of sampling transformer T2；One end of the output end of main transformer T1
It is separately connected the anode of one end and diode D1 of capacitance C1；One end of the other end connection resistance R1 of capacitance C1；Resistance R1's
The other end is separately connected the cathode of diode D1, one end of resistance R2, the cathode of diode D2, the cathode of diode D3, resistance
One end of R3, input anode are simultaneously picked shell by capacitance C3；One end of the other end connection capacitance C2 of resistance R2；C2's is another
End, the anode of diode D2, diode D3 anode be connected to main transformer T1 output end the other end；Resistance R3's is another
One end connects one end of resistance R4；The other end of the output end of one end connection main transformer T1 of inductance L1；Inductance L1's is another
End, resistance R4 the other end be all connected with input cathode and picked shell by capacitance C4.
As shown in figure 3, cutting machine output control system also includes driving circuit, the cutting machine load includes IGBT；It is single
Piece machine, driving circuit, IGBT, main transformer T1 are sequentially connected；The pwm signal that microcontroller generates drives through overdrive circuit
IGBT。
Correspondingly, it the present invention also provides a kind of cutting machine output control method, comprises the steps of：Step S1：Acquisition
Cutting machine load current signal；Step S2：Collected cutting machine load current signal is improved, control signal is generated；
Step S3：Judge whether cutting machine is in normal cut state according to control signal, if it is determined that being in normal cut state, then holds
Continuous output PWM；If it is determined that in abnormal cut state, then PWM is turned off.
Preferred embodiment：
In step S1, microcontroller generates the output of pwm signal control cutting machine, generates to constant current.In step S2, cutting
Machine load current signal is sampled through over-sampling transformer T2, and entering signal modulate circuit is transformed to fit by signal conditioning circuit
Control signal for microcontroller.In step S3, after microcontroller receives control signal, according to the size of signal, judge to cut
The cut state of machine, if being in normal cut state, persistently exports PWM with the presence or absence of exception.If being in abnormality, close
Disconnected PWM.
Cutting machine load current signal is obtained by PWM through overdrive circuit driving IGBT, and by main transformer T1 and
Rectifying output circuit obtains the final output of cutting machine.Cutting machine load current signal is collected through over-sampling transformer T2,
By signal conditioning circuit, it is transformed into the input signal of microcontroller.Microcontroller output current signal, that is, controlling signal can show
Go out the current cut state of cutting machine, judges whether cutting machine is in abnormality according to cut state.Assuming that cutting machine
The electric current of final output is I, and the primary side of main transformer T1 and the number of turns of primary side are respectively Z1With Z2, sampling transformer T2's
The number of turns of primary side and primary side is respectively Z3With Z4, then finally obtained sampled current signals beSampling electricity
It flows signal and passes through R5It is transformed to voltage signal, by R6、R7The bleeder circuit of composition, into the voltage signal of comparator forward end
ForWhen cutting machine is normally cut, cutting machine load current when collecting normal cutting by sampling transformer T2
Signal is judged as normal cut state by microcontroller, persistently exports PWM.Cutting machine cut state changes, for example, cutting
If cutting mill load current signal is down to 1A, it is with the voltage signal that signal conditioning circuit collects by sampling transformer T2Microcontroller judges that cutting machine load current signal is less than electric current when normally cutting at this time according to this voltage signal
Numerical value then turns off PWM.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.In the absence of conflict, the feature in embodiments herein and embodiment can arbitrary phase
Mutually combination.
Claims (7)
1. a kind of cutting machine output control system, which is characterized in that include signal sample circuit, signal conditioning circuit and monolithic
Machine；
Signal sample circuit acquires cutting machine load current signal；
Signal conditioning circuit improves collected cutting machine load current signal, generates control signal；
Microcontroller：Judge whether cutting machine is in normal cut state according to control signal, if it is determined that it is in normal cut state,
Then persistently export PWM；If it is determined that in abnormal cut state, then PWM is turned off.
2. cutting machine output control system according to claim 1, which is characterized in that the signal sample circuit includes to adopt
Sample transformer T2；
The input terminal for sampling transformer T2 constitutes main transformer input series connection end；
One end of the output end of sampling transformer T2 is connected to signal adjustment circuit, the other end of the output end of sampling transformer T2
Ground connection.
3. cutting machine output control system according to claim 2, which is characterized in that the signal conditioning circuit includes electricity
Hinder R5, resistance R6, resistance R7, resistance R8, diode D4, capacitance C5 and voltage comparator U1；
One end of the output end of one end connection sampling transformer T2 of resistance R5, the other end ground connection of resistance R5；Diode D4's
One end of the output end of anode connection sampling transformer T2, one end of the cathode connection resistance R6 of diode D4；Resistance R6's is another
One end is separately connected the normal phase input end of one end of resistance R7, one end of capacitance C5 and voltage comparator U1；Resistance R7's is another
One end and the other end of capacitance C5 are grounded；The inverting input of voltage comparator U1 connect with output end after with resistance R8 one
End connection；The other end of resistance R8 is connected to the AD mouths of microcontroller.
4. cutting machine output control system according to claim 3, which is characterized in that also include rectifying output circuit：It is right
Cutting machine load current carries out rectification and output.
5. cutting machine output control system according to claim 4, which is characterized in that rectifying output circuit includes main transformer pressure
Device T1, resistance R1, resistance R2, resistance R3, resistance R4, diode D1, diode D2, diode D3, capacitance C1, capacitance C2, electricity
Hold C3, capacitance C4, inductance L1；
The input terminal of main transformer T1 is connected with the input terminal of sampling transformer T2；Distinguish one end of the output end of main transformer T1
Connect the anode of one end and diode D1 of capacitance C1；One end of the other end connection resistance R1 of capacitance C1；Resistance R1's is another
End is separately connected the cathode of diode D1, one end of resistance R2, the cathode of diode D2, the cathode of diode D3, resistance R3
One end, input anode are simultaneously picked shell by capacitance C3；One end of the other end connection capacitance C2 of resistance R2；The other end of C2,
The anode of diode D2, the anode of diode D3 are connected to the other end of the output end of main transformer T1；Resistance R3's is another
One end of end connection resistance R4；The other end of the output end of one end connection main transformer T1 of inductance L1；The other end of inductance L1,
The other end of resistance R4 is all connected with input cathode and is picked shell by capacitance C4.
6. cutting machine output control system according to claim 5, which is characterized in that also include driving circuit, it is described to cut
Cutting mill load includes IGBT；Microcontroller, driving circuit, IGBT, main transformer T1 are sequentially connected；The pwm signal that microcontroller generates
IGBT is driven through overdrive circuit.
7. a kind of cutting machine output control method, which is characterized in that comprise the steps of：
Step S1：Acquire cutting machine load current signal；
Step S2：Collected cutting machine load current signal is improved, control signal is generated；
Step S3：Judge whether cutting machine is in normal cut state according to control signal, if it is determined that it is in normal cut state,
Then persistently export PWM；If it is determined that in abnormal cut state, then PWM is turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810285076.1A CN108710317A (en) | 2018-04-02 | 2018-04-02 | Cutting machine output control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810285076.1A CN108710317A (en) | 2018-04-02 | 2018-04-02 | Cutting machine output control system and method |
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| Publication Number | Publication Date |
|---|---|
| CN108710317A true CN108710317A (en) | 2018-10-26 |
Family
ID=63866527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810285076.1A Pending CN108710317A (en) | 2018-04-02 | 2018-04-02 | Cutting machine output control system and method |
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| CN (1) | CN108710317A (en) |
Cited By (2)
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| CN110076437A (en) * | 2019-05-24 | 2019-08-02 | 成都工业学院 | A kind of high-precision plasma cutting machine |
| CN111822831A (en) * | 2020-07-21 | 2020-10-27 | 常州九圣焊割设备股份有限公司 | Real-time detection method for consumable part of plasma cutting machine |
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