CN107931783A - Rectangular wave amplitude modulation current potential sorting circuit and method - Google Patents
Rectangular wave amplitude modulation current potential sorting circuit and method Download PDFInfo
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- CN107931783A CN107931783A CN201711193272.8A CN201711193272A CN107931783A CN 107931783 A CN107931783 A CN 107931783A CN 201711193272 A CN201711193272 A CN 201711193272A CN 107931783 A CN107931783 A CN 107931783A
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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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
- B23K9/092—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits characterised by the shape of the pulses produced
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Abstract
The present invention relates to a kind of rectangular wave amplitude modulation current potential sorting circuit and method, the wherein circuit includes rectangular wave generating unit, rectangular wave amplitude modulation unit, rectangular wave amplitude transformation unit, rectangle wave amplitude identifying unit, linear isolation unit and MCU micro-control units.Using the rectangular wave amplitude modulation current potential sorting circuit and method in the invention, the square-wave signal that rectangular wave amplitude modulation unit exports is transformed to by positive potential signal by rectangular wave amplitude transformation unit, the low and high level signal that MCU micro-control units are exported according to rectangle wave amplitude identifying unit at the same time, direct sorting goes out the corresponding positive potential information of positive/negative electrical potential information with the output of rectangular wave amplitude modulation unit in single channel circuit linearity insulating circuit, the positive potential information finally gone out according to the sorting optionally carries out welding current or weldingvoltage setting, therefore it further simplify circuit structure, reduce cost, improve the adjustment response speed of signal potential.
Description
Technical field
The present invention relates to welding field, more particularly to current potential sorting technical field, in particular to a kind of rectangle wave amplitude tune
Current potential sorting circuit processed and method.
Background technology
Welding current, the weldingvoltage of the existing source of welding current adjust the distance generally in wire feeder side, actual use and weld
Connect power supply farther out, to reduce the control line between the source of welding current and wire feeder, welding current and weldingvoltage adjustment signal lead to
Cross a signal wire to be transmitted, the method used is generates positive and negative rectangular wave by rectangle wave generating device, by remote controler
Welding current potentiometer, weldingvoltage potentiometer carry out positive and negative amplitude modulation, as welding current potentiometer modulates true amplitude, welding
The negative amplitude of voltage potentiometer modulation, i.e., the true amplitude of modulated rectangular wave adjust signal potential for welding current, and negative amplitude is
Weldingvoltage adjusts signal potential.Modulated rectangular wave in source of welding current side after follower, be separately input to true amplitude and
Negative amplitude sorting circuit, the current potential after sorting is kept by the holding circuit that larger electrolytic capacitor is formed, then using two
Linear isolation circuit carries out the transmission respectively of two paths of signals current potential, and current potential holding circuit reduces the response of signal adjustment, together
When, sorting circuit is complicated, and two-way circuit linearity insulating circuit (please refer to Fig.1 with shown in Fig. 2) adds cost.
The content of the invention
The shortcomings that the purpose of the present invention is overcoming the above-mentioned prior art, there is provided one kind can simplify circuit structure and carry
The rectangular wave amplitude modulation current potential sorting circuit and method of lofty tone entire signal response speed.
To achieve these goals, rectangular wave amplitude modulation current potential sorting circuit of the invention and method are as follows：
The rectangular wave amplitude modulation current potential sorting circuit, it is mainly characterized by, and the circuit includes：
Rectangular wave generating unit, the first square-wave signal fixed for exporting positive and negative amplitude；
Rectangular wave amplitude modulation unit, for changing the amplitude of first square-wave signal according to modulation current potential with defeated
Go out the second square-wave signal with positive and negative amplitude, input terminal and the rectangular wave of the rectangular wave amplitude modulation unit occur
The output terminal of unit is connected；
Rectangular wave amplitude transformation unit, for second square-wave signal to be transformed to the 3rd positive potential signal, institute
The input terminal for stating rectangular wave amplitude transformation unit is connected with the output terminal of the rectangular wave amplitude modulation unit；
Linear isolation unit, is transmitted to export the 4th positive electricity for the 3rd positive potential signal to be carried out linear isolation
Position signal, the input terminal of the linear isolation unit are connected with the output terminal of rectangular wave amplitude transformation unit；
Rectangle wave amplitude identifying unit, for producing a positive and negative amplitude alt time with second square-wave signal
Corresponding low and high level signal, the output of the input terminal of the rectangle wave amplitude identifying unit and the rectangular wave generating unit
End is connected；
MCU micro-control units, for gathering the 4th positive potential signal, and according to the low and high level signal point
The electrical potential information of detection the 4th positive potential signal, the input terminals of the MCU micro-control units respectively with it is described linearly every
Output terminal from unit is connected with the output terminal of the rectangle wave amplitude identifying unit.
The positive and negative amplitude of second square-wave signal of the rectangular wave amplitude modulation current potential sorting circuit and the modulation current potential
Positive negative potential it is identical.
The electrical potential information of 4th positive potential signal of the rectangular wave amplitude modulation current potential sorting circuit carries second square
The positive and negative amplitude information of shape ripple signal, the MCU micro-control units according to the low and high level signal sorting go out with it is described
The electrical potential information of the corresponding 4th positive potential signal of positive and negative amplitude of second square-wave signal.
The 3rd positive potential signal and the 4th positive potential signal of the rectangular wave amplitude modulation current potential sorting circuit exist
The current potential of synchronization is equal.
The current potential of 3rd positive potential signal of the rectangular wave amplitude modulation current potential sorting circuit is believed with second rectangular wave
Number amplitude absolute value it is equal.
The rectangular wave generating unit of the rectangular wave amplitude modulation current potential sorting circuit is specially：
First comparator, the negative input of the first comparator are connected with the first capacitance and the 3rd pull-up resistor,
The electrode input end of the first comparator is connected with first resistor and the second pull-up resistor, and the 3rd pull-up resistor across
Be connected between the negative input of the first comparator and the output terminal of the first comparator, second pull-up resistor across
It is connected between the electrode input end of the first comparator and the output terminal of the first comparator.
The rectangular wave amplitude transformation unit of the rectangular wave amplitude modulation current potential sorting circuit further comprises：
Follow circuit, current potential translation circuit and filter circuit, the described input terminal for following circuit by the 5th resistance with
The output terminal of rectangular wave amplitude modulation unit is connected, and described follows circuit, current potential translation circuit and filter circuit to connect successively
Connect, and the output terminal that the output terminal of the filter circuit circuit is the rectangular wave amplitude transformation unit.
In the rectangular wave amplitude modulation current potential sorting circuit,
The circuit that follows is specially：
Second amplifier, the electrode input end of second amplifier pass through the 5th resistance and the rectangle wave amplitude
The output terminal of modulation unit is connected, and the negative input of second amplifier is connected to the output terminal of second amplifier；
The current potential translation circuit includes：
3rd amplifier, the negative input of the 3rd amplifier are connected with the 6th resistance and the 7th resistance respectively,
The negative input that 7th resistance is connected across the 3rd amplifier is connected with the output terminal of the 3rd amplifier, and described
The electrode input end of three amplifiers is connected with the 18th resistance, and the 3rd amplifier follows electricity by the 6th resistance with described
The output terminal on road is connected；
First diode, is connected with the output terminal for following circuit；
3rd diode, is connected with the output terminal of the 3rd amplifier, and first diode and the 3rd diode
Output terminal and filter circuit input terminal connect；
The filter circuit includes：
8th resistance, the 9th resistance and the 4th capacitance, the 8th resistance are connected with the current potential translation circuit, and
It is connected after 9th resistance and the 4th capacitance parallel connection with the 8th resistance.
The linear isolation unit of the rectangular wave amplitude modulation current potential sorting circuit includes：
Four high guaily unit, the electrode input end of the four high guaily unit pass through the tenth resistance and the rectangular wave amplitude transformation unit
Output terminal be connected, the negative input of the four high guaily unit is connected with the 11st resistance and the 5th capacitance, the described 5th
Capacitance is connected across between the output terminal of the four high guaily unit and the negative input of the four high guaily unit；
Linear optical coupling, is connected by the 12nd resistance with the output terminal of the four high guaily unit, the 12nd resistance with
5th capacitance is connected, and the 5th capacitance is connected across between the 12nd resistance and the linear optical coupling input terminal, and institute
Input terminal of the output terminal of linear optical coupling respectively with the 13rd resistance and the MCU micro-control units is stated to be connected；
The rectangle wave amplitude identifying unit of the rectangular wave amplitude modulation current potential sorting circuit includes：
Rectangular wave follows circuit and isolation circuit, and the rectangular wave follows circuit to include：
14th resistance, the 4th diode, the 17th resistance, the 5th amplifier and the 15th resistance, the described the 14th electricity
Resistance be connected with the output terminal of the rectangular wave generating unit, after the 14th resistance and the 4th Diode series with institute
The 17th resistance stated is in parallel, and the 17th resistance is connected with the electrode input end of the 5th amplifier, and described
The negative input of five amplifiers is connected with the output terminal of the 5th amplifier, and the output terminal of the 5th amplifier connects respectively
15 resistance and the 16th resistance；
The isolation circuit includes：
16th resistance, optocoupler and the 19th resistance, the 16th resistance are connected with the output terminal of the 5th amplifier
Connect, and input terminal of the output terminal of the optocoupler respectively with the 19th resistance and the MCU micro-control units is connected.
This realizes the method for rectangular wave amplitude modulation current potential sorting based on foregoing circuit, it is mainly characterized by, the side
Method comprises the following steps：
(1) the rectangular wave generating unit exports the first square-wave signal that positive and negative amplitude is fixed；
(2) the rectangular wave amplitude modulation unit according to modulation current potential change the amplitude of first square-wave signal with
Second square-wave signal of the output with positive and negative amplitude, while the rectangle wave amplitude identifying unit produces one and described the
The corresponding low and high level signal of positive and negative amplitude alt time of two square-wave signals；
(3) second square-wave signal is transformed to the 3rd positive potential signal by the rectangular wave amplitude transformation unit；
(4) the linear isolation unit described in exports the 4th after the 3rd positive potential signal is carried out linear isolation transmission
Positive potential signal；
(5) the 4th positive potential signal described in the collection of MCU micro-control units described in, and believed according to the low and high level
Number sort out the electrical potential information of the 4th positive potential signal.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (2), second square-wave signal
Positive and negative amplitude is identical with the positive negative potential of the modulation current potential.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (3), the 3rd positive potential signal
Current potential is equal with the absolute value of the amplitude of second square-wave signal.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (4), the 3rd positive potential signal and
The 4th positive potential signal is equal in the current potential of synchronization.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (5), the 4th positive potential signal
Electrical potential information carries the positive and negative amplitude information of second square-wave signal, and the MCU micro-control units are according to the height
Low level signal sorting goes out to be believed with the current potential of the corresponding 4th positive potential signal of the positive and negative amplitude of second square-wave signal
Breath.
Rectangular wave amplitude modulation current potential sorting circuit and the method in the invention are employed, passes through rectangular wave amplitude transformation list
The positive and negative amplitude current potential of rectangular wave of rectangular wave amplitude modulation unit output is transformed to positive potential signal by member, and MCU is according to rectangular wave
Amplitude identifying unit output low and high level come determine the positive potential signal that it is gathered be rectangular wave modulation unit output
True amplitude current potential still bears the absolute value of amplitude current potential, realizes the sorting of rectangular wave amplitude modulation current potential, you can according to the square
The setting for carrying out welding current current potential or weldingvoltage current potential of the positive/negative amplitude current potential selectivity of shape ripple signal.Therefore, the hair
The bright response speed for further simplify circuit structure, reducing cost, improving sorting current potential.
Brief description of the drawings
Fig. 1 is the FB(flow block) of the rectangular wave amplitude modulation current potential sorting circuit of the prior art.
Fig. 2 is the sequence diagram with the corresponding rectangular wave amplitude modulation current potential sorting circuits of Fig. 1 in the prior art.
Fig. 3 is the FB(flow block) of the rectangular wave amplitude modulation current potential sorting circuit of the present invention.
Fig. 4 is the sequence diagram with the corresponding rectangular wave amplitude modulation current potential sorting circuits of Fig. 3 of the present invention.
Fig. 5 is the particular circuit configurations schematic diagram of the rectangular wave amplitude modulation current potential sorting circuit of the present invention.
Embodiment
In order to more clearly describe the technology contents of the present invention, carried out with reference to specific embodiment further
Description.
Refer to shown in Fig. 3 and Fig. 4, it is respectively the flow chart element of the rectangular wave amplitude modulation current potential sorting circuit of the present invention
Figure and the sequence diagram with the corresponding rectangular wave amplitude modulation current potential sorting circuits of Fig. 3.The rectangular wave generating unit output is just
The first square-wave signal (the A points waveform in Fig. 4) that negative amplitude is fixed, first square-wave signal is through rectangle wave amplitude tune
Output has positive and negative the second square-wave signal of amplitude (the B points waveform in Fig. 4) after unit processed, second square-wave signal it is positive and negative
Amplitude is identical with the positive negative potential for modulating current potential, and second square-wave signal exports after the rectangular wave amplitude transformation unit
3rd positive potential signal (the C points waveform in Fig. 4), the 4th positive electricity is exported after the linear isolated location of the 3rd positive potential signal
Position signal (the D points waveform in Fig. 4), rectangle wave amplitude identifying unit produce a positive and negative width with second square-wave signal
It is worth the corresponding low and high level signal of alt time (the E points waveform in Fig. 4), finally, the MCU micro-control units are gathering
After the 4th positive potential signal, and the electricity of the 4th positive potential signal according to going out the low and high level signal sorting
Position information, the electrical potential information is corresponding with the positive and negative amplitude of the second square-wave signal, therefore can be believed according to the low and high level
The electrical potential information that number sorting goes out the 4th gathered positive potential signal is the true amplitude of second square-wave signal or negative width
The correspondence electrical potential information of value.
In practical applications, when the rectangular wave of rectangular wave amplitude modulation unit output is positive potential, the rectangle wave amplitude
It is equal with this positive potential to be worth the current potential of converter unit output, when the rectangular wave that rectangular wave amplitude modulation unit exports is negative potential
When, the current potential of the rectangular wave amplitude transformation unit output is equal with the absolute value of this negative potential.
In practical applications, the positive potential signal of rectangular wave amplitude transformation unit output is after single channel linear isolation unit
It is input to MCU micro-control units；Meanwhile square-wave signal is positive and negative after rectangle wave amplitude identifying unit is generated and modulated with rectangular wave
Amplitude signal duration consistent low and high level judges signal, which judges that signal is input to after light-coupled isolation
MCU micro-control units.The low and high level that last MCU micro-control units are exported according to rectangle wave amplitude identifying unit judges signal,
The positive potential exported to the linear isolation unit in the corresponding time is acquired, you can sorting goes out corresponding signal potential and (such as sentences
When to determine signal be high level, the positive potential of MCU collections is the modulated true amplitude current potential of rectangular wave；Judge that signal is low level
When, the positive potential of MCU collections is the absolute value of the modulated negative amplitude current potential of rectangular wave).
Refer to shown in Fig. 5, it shows for the particular circuit configurations of the rectangular wave amplitude modulation current potential sorting circuit of the present invention
It is intended to.The rectangular wave generating unit of the rectangular wave amplitude modulation current potential sorting circuit is specially：
The rectangular wave generating unit of the rectangular wave amplitude modulation current potential sorting circuit is specially：
First comparator IC1A, the negative input of the first comparator IC1A and the first capacitance C1 and the 3rd pull-up electricity
Resistance R3 is connected, and the electrode input end of the first comparator IC1A is connected with first resistor R1 and the second pull-up resistor R2,
And the 3rd pull-up resistor R3 is connected across the negative input of the first comparator IC1A and the first comparator IC1A
Output terminal between, the second pull-up resistor R2 is connected across the electrode input end of the first comparator compared with described first
Between the output terminal of device IC1A.
The rectangular wave amplitude transformation unit of the rectangular wave amplitude modulation current potential sorting circuit further comprises：
Circuit, current potential translation circuit and filter circuit are followed, the input terminal for following circuit passes through the 5th resistance R5
It is connected with the output terminal of rectangular wave amplitude modulation unit, described follows circuit, current potential translation circuit and filter circuit successively
Connection, and the output terminal that the output terminal of the filter circuit circuit is the rectangular wave amplitude transformation unit.
The circuit that follows of the rectangular wave amplitude modulation current potential sorting circuit is specially：
The electrode input end of second amplifier IC1B, the second amplifier IC1B by the 5th resistance R5 with it is described
The output terminal of rectangular wave amplitude modulation unit is connected, and the negative input of the second amplifier IC1B is connected to second fortune
Put the output terminal of IC1B；
The current potential translation circuit of the rectangular wave amplitude modulation current potential sorting circuit includes：
The negative input of 3rd amplifier IC1C, the 3rd amplifier IC1C are electric with the 6th resistance R6 and the 7th respectively
Resistance R7 is connected, and the 7th resistance R7 is connected across the negative input of the 3rd amplifier IC1C and the 3rd amplifier IC1C
Output terminal be connected, the electrode input end of the 3rd amplifier IC1C is connected with the 18th resistance R18, the 3rd amplifier
IC1C is connected by the 6th resistance R6 with the output terminal for following circuit；
First diode D1, is connected with the output terminal for following circuit；
3rd diode D3, is connected with the output terminal of the 3rd amplifier IC1C, and the first diode D1 and
The output terminal of three diode D3 and the input terminal of filter circuit connect；
The filter circuit of the rectangular wave amplitude modulation current potential sorting circuit includes：
8th resistance R8, the 9th resistance R9 and the 4th capacitance C4, the 8th resistance R8 and the current potential translation circuit
It is connected, and is connected after the 9th resistance R9 and the 4th capacitance C4 parallel connections with the 8th resistance R8.
The linear isolation unit of the rectangular wave amplitude modulation current potential sorting circuit includes：
Four high guaily unit IC1D, the electrode input end of the four high guaily unit IC1D pass through the tenth resistance R10 and the rectangular wave
The output terminal of amplitude transformation unit is connected, the negative input and the 11st resistance R11 and the 5th of the four high guaily unit IC1D
Capacitance C5 is connected, and the 5th capacitance C5 is connected across the output terminal of the four high guaily unit and the anode of the four high guaily unit IC1D
Between input terminal；
Linear optical coupling IC3, is connected by the 12nd resistance R12 with the output terminal of the four high guaily unit IC1D, and described
12 resistance R12 are connected with the 5th capacitance C5, the 5th capacitance C5 be connected across the 12nd resistance R12 with it is described linear
Between optocoupler IC3 input terminals, and the output terminal of the linear optical coupling IC3 respectively with the 13rd resistance R13 and the MCU microcontrollers
The input terminal of unit is connected；
The rectangle wave amplitude identifying unit of the rectangular wave amplitude modulation current potential sorting circuit includes：
Rectangular wave follows circuit and isolation circuit, and the rectangular wave follows circuit to include：
14th resistance R14, the 4th diode D4, the 17th resistance R17, the 5th amplifier IC2B and the 15th resistance R15,
The 14th resistance R14 is connected with the output terminal of the rectangular wave generating unit, the 14th resistance R14 and
It is in parallel after 4th diode D4 series connection with the 17th resistance R17, the 17th resistance R17 and the described 5th fortune
The electrode input end for putting IC2B is connected, the negative input of the 5th amplifier IC2B and the output of the 5th amplifier IC2B
End is connected, and the output terminal of the 5th amplifier connects the 15th resistance R15 and the 16th resistance R16 respectively；
The isolation circuit includes：
16th resistance R16, optocoupler IC4 and the 19th resistance R19, the 16th resistance R16 and the 5th amplifier
The output terminal of IC2B is connected, and the output terminal of the optocoupler IC4 respectively with the 19th resistance R19 and the MCU microcontrollers list
The input terminal of member is connected.
In practical applications, the method that rectangular wave amplitude modulation current potential sorting should be realized based on foregoing circuit, it is main special
Point is that the method comprises the following steps：
(1) the rectangular wave generating unit exports the first square-wave signal that positive and negative amplitude is fixed；
(2) the rectangular wave amplitude modulation unit according to modulation current potential change the amplitude of first square-wave signal with
Second square-wave signal of the output with positive and negative amplitude, while the rectangle wave amplitude identifying unit produces one and described the
The corresponding low and high level signal of positive and negative amplitude alt time of two square-wave signals；
(3) second square-wave signal is transformed to the 3rd positive potential signal by the rectangular wave amplitude transformation unit；
(4) the linear isolation unit described in exports the 4th after the 3rd positive potential signal is carried out linear isolation transmission
Positive potential signal；
(5) the 4th positive potential signal described in the collection of MCU micro-control units described in, and believed according to the low and high level
Number sort out the electrical potential information of the 4th positive potential signal.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (2), second square-wave signal
Positive and negative amplitude is identical with the positive negative potential of the modulation current potential.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (3), the 3rd positive potential signal
Current potential is equal with the absolute value of the amplitude of second square-wave signal.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (4), the 3rd positive potential signal and
The 4th positive potential signal is equal in the current potential of synchronization.
This is realized in the step of method of rectangular wave amplitude modulation current potential sorting (5), the 4th positive potential signal
Electrical potential information carries the positive and negative amplitude information of second square-wave signal, and the MCU micro-control units are according to the height
Low level signal sorting goes out to be believed with the current potential of the corresponding 4th positive potential signal of the positive and negative amplitude of second square-wave signal
Breath.
In the present embodiment, first comparator use+15V and -15V power supplys in rectangular wave generating unit, resistance R1~R3,
First capacitance C1 and first comparator IC1A forms self-oscillating circuit, and one frequency is fixed, the absolute value of positive and negative amplitude is 15V for generation
Rectangular wave (refer to Fig. 4 in A points waveform), this rectangular wave is input to rectangular wave amplitude modulation unit.
Rectangular wave amplitude modulation unit is according to set welding current and weldingvoltage current potential to the positive and negative amplitude of rectangular wave
It is modulated, for example the positive and negative amplitude of rectangular wave is modulated to the rectangular wave that true amplitude is+10V, negative amplitude is -8V and (refers in Fig. 4
B points waveform), regulation welding current setting value is modulated to positive potential+10V herein, and weldingvoltage setting value is modulated to -8V.
When modulated rectangular wave be+10V amplitude when, on the one hand ,+10V current potentials through the second amplifier IC1B form with
After device, the 9th foot (negative input end) of the 3rd amplifier IC1C is input to after the 6th resistance R6, then the 8th of the 3rd amplifier IC1C
Foot exports a negative potential, and the 3rd diode D3 ends at this time, and on the other hand ,+10V current potentials are followed through what the second amplifier IC1B was formed
The first diode D1 is input to after device, linear isolation unit is output to after the 8th resistance R8；When modulated rectangular wave is -8V
Amplitude when, on the one hand, the first diode D1 is input to after the follower that -8V current potentials are formed through the second amplifier IC1B, at this time
One diode D1 ends；On the other hand, it is defeated after the 6th resistance R6 after the follower that -8V current potentials are formed through the second amplifier IC1B
Enter the 9th foot (negative input end) to the 3rd amplifier IC1C, the 3rd amplifier IC1C and resistance R6~R7 form amplification factor be 1 it is anti-
Phase amplifying circuit, the 8th foot output+8V current potentials of the 3rd amplifier IC1C, the 3rd diode D3 conductings at this time ,+8V current potentials are through the 8th
Linear isolation unit is output to after resistance R8.(referring to C points waveform in Fig. 4)
Positive potential signal after rectangular wave amplitude transformation unit is input to the tenth resistance R10 in linear isolation unit,
And the 5th foot (output terminal) current potential of linear optical coupling IC3 and the input current potential of the tenth resistance R10 are equal and synchronous, i.e. linear optical coupling
The 5th foot output of the IC3 positive potential signal equal and synchronous with the positive potential signal of rectangular wave amplitude transformation unit output.(ginseng
Read D points waveform in Fig. 4)
The rectangular wave of rectangular wave generating unit output is input to rectangle wave amplitude identifying unit at the same time.When rectangle wave amplitude is
During+15V ,+15V current potentials are through the 14th resistance R14, that the 4th diode D4 is input to the follower being made of the 5th amplifier IC2B is defeated
Enter the 5th foot of the 5th amplifier IC2B of end, the 7th foot output high level of the 5th amplifier IC2B, this high level is through the 16th resistance R16
Optocoupler IC4 work is driven afterwards, then the output terminal output high level signal that the 19th resistance R19 is connected with optocoupler IC4；Work as rectangle
When wave amplitude is -15V, -15V current potentials are input to the 4th diode D4 through the 14th resistance R14, and the 4th diode D4 is cut at this time
Only, inputted to the 5th foot of the 5th amplifier IC2B by the 5th amplifier IC2B followers formed, and connect by the 17th resistance R17
Ground, while the 7th foot output low level of the 5th amplifier IC2B, this low and high level are input to optocoupler after the 16th resistance R16
IC4, when optocoupler IC4 ends, then the output terminal that resistance R19 is connected with optocoupler IC4 exports low level signal.So rectangle
When wave amplitude is positive potential, rectangle wave amplitude identifying unit output high level, when this rectangle wave amplitude is negative potential, rectangle wave amplitude
It is worth identifying unit output low level.(referring to E points waveform in Fig. 4)
MCU input terminals receive the+8V and+10 alternate positive potentials of the output of linear isolation unit, while receive rectangle wave amplitude
It is worth the low and high level signal of identifying unit output.When rectangle wave amplitude identifying unit exports high level, corresponding rectangle wave amplitude
Modulated positive potential, i.e. welding current set current potential, and the current potential that MCU is gathered during this period is+10V, are that welding current is set
Determine current potential；When rectangle wave amplitude identifying unit exports low level, the negative potential after corresponding rectangular wave amplitude modulation, i.e. welding electricity
Pressure setting current potential, the current potential that MCU is gathered during this period is+8V, is weldingvoltage setting current potential.Thereby realize welding electricity
Stream setting current potential is isolated with following with weldingvoltage setting current potential.
Rectangular wave amplitude modulation current potential sorting circuit and the method in the invention are employed, passes through rectangular wave amplitude transformation list
The square-wave signal with positive and negative amplitude of rectangular wave amplitude modulation unit output is transformed to positive potential signal by member, using single channel
Circuit linearity insulating circuit is the isolation transmission that two kinds of signals can be achieved.The height electricity that MCU is exported according to rectangle wave amplitude identifying unit
Put down to determine the absolute value of true amplitude that its electrical potential information gathered is the output of rectangular wave modulation unit or negative amplitude, it is real
Show the sorting of rectangular wave amplitude modulation current potential, meanwhile, no longer needed after the setting current potential sorting of welding current and weldingvoltage
Bulky capacitor carries out current potential holding, therefore welding current and the response speed of weldingvoltage setting current potential adjustment improve.Therefore, the invention
Further simplify circuit structure, reduce cost, improve welding current and weldingvoltage current potential adjustment response speed.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings are considered as illustrative
It is and nonrestrictive.
Claims (15)
1. a kind of rectangular wave amplitude modulation current potential sorting circuit, it is characterised in that the circuit includes：
Rectangular wave generating unit, the first square-wave signal fixed for exporting positive and negative amplitude；
Rectangular wave amplitude modulation unit, the amplitude for changing first square-wave signal according to modulation current potential have to export
There are the second square-wave signal of positive and negative amplitude, the input terminal of the rectangular wave amplitude modulation unit and the rectangular wave generating unit
Output terminal be connected；
Rectangular wave amplitude transformation unit, for second square-wave signal to be transformed to the 3rd positive potential signal, the square
The input terminal of shape wave amplitude converter unit is connected with the output terminal of the rectangular wave amplitude modulation unit；
Linear isolation unit, is believed for the 3rd positive potential signal to be carried out linear isolation transmission with exporting the 4th positive potential
Number, the input terminal of the linear isolation unit is connected with the output terminal of rectangular wave amplitude transformation unit；
Rectangle wave amplitude identifying unit is opposite with the positive and negative amplitude alt time of second square-wave signal for producing one
The low and high level signal answered, the output terminal phase of the input terminal of the rectangle wave amplitude identifying unit and the rectangular wave generating unit
Connection；
MCU micro-control units, for gathering the 4th positive potential signal, and go out according to the low and high level signal sorting
The electrical potential information of the 4th positive potential signal, the input terminals of the MCU micro-control units respectively with the linear isolation list
The output terminal of member is connected with the output terminal of the rectangle wave amplitude identifying unit.
2. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that second rectangle
The positive and negative amplitude of ripple signal is identical with the positive negative potential of the modulation current potential.
3. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that the 4th positive electricity
The electrical potential information of position signal carries the positive and negative amplitude information of second square-wave signal, the MCU micro-control units according to
The low and high level signal sorting goes out and the corresponding 4th positive potential signal of the positive and negative amplitude of second square-wave signal
Electrical potential information.
4. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that the 3rd positive electricity
Position signal and the 4th positive potential signal are equal in the current potential of synchronization.
5. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that the 3rd positive electricity
The current potential of position signal is equal with the absolute value of the amplitude of second square-wave signal.
6. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that the rectangular wave hair
Giving birth to unit is specially：
First comparator (IC1A), the negative input and the first capacitance (C1) of the first comparator (IC1A) and the 3rd pull-up
Resistance (R3) is connected, electrode input end and first resistor (R1) and the second pull-up resistor of the first comparator (IC1A)
(R2) be connected, and the 3rd pull-up resistor (R3) be connected across the negative input of the first comparator (IC1A) with it is described
Between the output terminal of first comparator (IC1A), the cathode that second pull-up resistor (R2) is connected across the first comparator is defeated
Enter between end and the output terminal of the first comparator (IC1A).
7. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that the rectangle wave amplitude
Value converter unit further comprises：
Follow circuit, current potential translation circuit and filter circuit, the described input terminal for following circuit by the 5th resistance (R5) with
The output terminal of rectangular wave amplitude modulation unit is connected, and described follows circuit, current potential translation circuit and filter circuit to connect successively
Connect, and the output terminal that the output terminal of the filter circuit circuit is the rectangular wave amplitude transformation unit.
8. rectangular wave amplitude modulation current potential sorting circuit according to claim 7, it is characterised in that
The circuit that follows is specially：
Second amplifier (IC1B), the electrode input end of second amplifier (IC1B) by the 5th resistance (R5) with it is described
The output terminal of rectangular wave amplitude modulation unit be connected, the negative input of second amplifier (IC1B) is connected to described
The output terminal of two amplifiers (IC1B)；
The current potential translation circuit includes：
3rd amplifier (IC1C), the negative input of the 3rd amplifier (IC1C) respectively with the 6th resistance (R6) and the 7th
Resistance (R7) is connected, and the 7th resistance (R7) is connected across the negative input and the described 3rd of the 3rd amplifier (IC1C)
The output terminal of amplifier (IC1C) is connected, and the electrode input end of the 3rd amplifier (IC1C) is connected with the 18th resistance (R18)
Connect, the 3rd amplifier (IC1C) is connected by the 6th resistance (R6) with the output terminal for following circuit；
First diode (D1), is connected with the output terminal for following circuit；
3rd diode (D3), is connected with the output terminal of the 3rd amplifier (IC1C), and first diode (D1) and
The output terminal of 3rd diode (D3) and the input terminal of filter circuit connect；
The filter circuit includes：
8th resistance (R8), the 9th resistance (R9) and the 4th capacitance (C4), the 8th resistance (R8) convert with the current potential
Circuit is connected, and is connected after the 9th resistance (R9) and the parallel connection of the 4th capacitance (C4) with the 8th resistance (R8)
Connect.
9. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that the linear isolation
Unit includes：
Four high guaily unit (IC1D), the electrode input end of the four high guaily unit (IC1D) pass through the tenth resistance (R10) and the rectangle
The output terminal of wave amplitude converter unit is connected, the negative input and the 11st resistance (R11) of the four high guaily unit (IC1D)
It is connected with the 5th capacitance (C5), the 5th capacitance (C5) is connected across the output terminal of the four high guaily unit and the four high guaily unit
(IC1D) between negative input；
Linear optical coupling (IC3), is connected by the 12nd resistance (R12) with the output terminal of the four high guaily unit (IC1D), described
12nd resistance (R12) is connected with the 5th capacitance (C5), and the 5th capacitance (C5) is connected across the 12nd resistance (R12)
Between the linear optical coupling (IC3) input terminal, and the output terminal of the linear optical coupling (IC3) respectively with the 13rd resistance
(R13) input terminal with the MCU micro-control units is connected.
10. rectangular wave amplitude modulation current potential sorting circuit according to claim 1, it is characterised in that the rectangular wave
Amplitude identifying unit includes：
Rectangular wave follows circuit and isolation circuit, and the rectangular wave follows circuit to include：
14th resistance (R14), the 4th diode (D4), the 17th resistance (R17), the 5th amplifier (IC2B) and the 15th resistance
(R15), the 14th resistance (R14) is connected with the output terminal of the rectangular wave generating unit,
It is in parallel after 14th resistance (R14) and the series connection of the 4th diode (D4) with the 17th resistance (R17),
17th resistance (R17) is connected with the electrode input end of the 5th amplifier (IC2B), the 5th amplifier
(IC2B) negative input is connected with the output terminal of the 5th amplifier (IC2B), the output terminal difference of the 5th amplifier
Connect the 15th resistance (R15) and the 16th resistance (R16)；
The isolation circuit includes：
16th resistance (R16), optocoupler (IC4) and the 19th resistance (R19), the 16th resistance (R16) and the described 5th
The output terminal of amplifier (IC2B) is connected, and the output terminal of the optocoupler (IC4) respectively with the 19th resistance (R19) and described
The input terminal of MCU micro-control units is connected.
11. a kind of method that circuit based on described in claim 1 realizes rectangular wave amplitude modulation current potential sorting, its feature exist
In the method comprises the following steps：
(1) the rectangular wave generating unit exports the first square-wave signal that positive and negative amplitude is fixed；
(2) the rectangular wave amplitude modulation unit changes the amplitude of first square-wave signal to export according to modulation current potential
The second square-wave signal with positive and negative amplitude, while the rectangle wave amplitude identifying unit produces one and second square
The corresponding low and high level signal of positive and negative amplitude alt time of shape ripple signal；
(3) second square-wave signal is transformed to the 3rd positive potential signal by the rectangular wave amplitude transformation unit；
(4) the linear isolation unit described in exports the 4th positive electricity after the 3rd positive potential signal is carried out linear isolation transmission
Position signal；
(5) the 4th positive potential signal described in the collection of MCU micro-control units described in, and according to the low and high level signal point
Sort out the electrical potential information of the 4th positive potential signal.
12. the method according to claim 11 for realizing rectangular wave amplitude modulation current potential sorting, it is characterised in that described
In step (2), the positive and negative amplitude of second square-wave signal is identical with the positive negative potential of the modulation current potential.
13. the method according to claim 11 for realizing rectangular wave amplitude modulation current potential sorting, it is characterised in that described
In step (3), the current potential of the 3rd positive potential signal is equal with the absolute value of the amplitude of second square-wave signal.
14. the method according to claim 11 for realizing rectangular wave amplitude modulation current potential sorting, it is characterised in that described
In step (4), the 3rd positive potential signal and the 4th positive potential signal are equal in the current potential of synchronization.
15. the method according to claim 11 for realizing rectangular wave amplitude modulation current potential sorting, it is characterised in that described
In step (5), the electrical potential information of the 4th positive potential signal carries the positive and negative amplitude information of second square-wave signal,
The MCU micro-control units go out the positive and negative amplitude with second square-wave signal according to the low and high level signal sorting
The electrical potential information of corresponding 4th positive potential signal.
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| US20130158920A1 (en) * | 2011-12-19 | 2013-06-20 | Tyco Safety Products Canada Ltd. | Pulse width modulated voltage measuring circuit and method |
| US20140209586A1 (en) * | 2013-01-29 | 2014-07-31 | Shenzhen Jasic Technology Development Co., Ltd | Portable igbt arc welding machine |
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| CN101288222A (en) * | 2005-05-10 | 2008-10-15 | 丰田自动车株式会社 | Motor drive system control device and electric vehicle using the same |
| CN201287232Y (en) * | 2008-10-28 | 2009-08-12 | 上海沪工电焊机制造有限公司 | DSP power source control system applied to welding machine |
| CN102136803A (en) * | 2010-01-21 | 2011-07-27 | 深圳市汇川技术股份有限公司 | Pulse width modulation frequency variable power supply and dead zone compensation method thereof |
| CN102741659A (en) * | 2010-02-23 | 2012-10-17 | 三菱电机株式会社 | Digitization circuit for processing a detection signal |
| US20130158920A1 (en) * | 2011-12-19 | 2013-06-20 | Tyco Safety Products Canada Ltd. | Pulse width modulated voltage measuring circuit and method |
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