CN201886299U - Current differentiating circuit for electronic reactor - Google Patents
Current differentiating circuit for electronic reactor Download PDFInfo
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- CN201886299U CN201886299U CN2010202877848U CN201020287784U CN201886299U CN 201886299 U CN201886299 U CN 201886299U CN 2010202877848 U CN2010202877848 U CN 2010202877848U CN 201020287784 U CN201020287784 U CN 201020287784U CN 201886299 U CN201886299 U CN 201886299U
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Abstract
A current differentiating circuit for an electronic reactor comprises an operational amplifier U2, a digital potentiometer U4, a capacitor C1, diodes D1 and D4, voltage stabilizing pipes D2 and D3, and resistors R3, R4 and R5, wherein the capacitor C1 is connected with a signal input terminal and a negative input terminal of the operational amplifier U2; a positive input terminal of the operational amplifier U2 is grounded; the resistor R5 is connected with the output terminal of the operational amplifier U2 and a signal output terminal; the diode D4 and the resistor R4 in series connection, the voltage stabilizing pipes D2 and D3 in series-opposing connection, and two output terminals of the digital potentiometer U4, the diode D1 and the resistor R3 in series connection are respectively in bridge connection between the negative input terminal of the operational amplifier U2 and the signal output terminal; the control terminal of the digital potentiometer U4 is connected with a singlechip; and the orientations of polarities of both the diode D4 and the diode D1 are opposite. In the utility model, the digital potentiometer controlled by the singlechip is used to replace a manually adjusted potentiometer, so that digitalized adjustment of the electronic reactor is realized.
Description
Technical field:
The utility model relates to a kind of electronic inductor current differential circuit.
Background technology:
During CO2 shielded welding machine short circuiting transfer; in order to reduce spatter; di/dt in the time of need being connected in series a bigger reactor in order to the restriction short circuit in secondary major loop changes; the inductance value of the corresponding the best of different welding wires and different welding currents; in thyristor welder, be actually the iron core inductor that uses a fixed inductance amount; this inductor can't be realized regulating in welding machine work, so short circuiting transfer is difficult to be in optimum condition.
If inverter type welder also adopts big reactor, then the fast characteristic of the corresponding speed of inverter type welder is with impaired.For addressing this problem, in inverter type welder, generally all adopt very little reactor to satisfy the demand of loop filter, its inductance value only is equivalent to 1/5 ∽ 1/10 of traditional welding machine, and in control circuit, adopt special circuit to regulate the variation of di/dt in the welding circuit, in the scope that is implemented in whole short circuit welding di/dt is carried out even regulation, make welding process reach best, this special circuit is called " electronic inductor ".
The mode that realizes electronic inductor has a lot, as shown in Figure 1, adopts the capacity-type electronic reactor, and the capacity-type electronic reactor comprises condenser type current differential circuit, waveshape monitor and PWM control, realizes welding current waveform control.
As shown in Figure 2, be existing condenser type current differential circuit theory sketch, wherein V1 is the output voltage on the current sensor, its value V1=ki that is directly proportional with the welding circuit electric current.
According to the operation amplifier circuit theory, (R1+VR1) (R1+VR1) d (ki)/dt=-K1di/dt of d (V1)/dt=-(1/C1) of V2=-(1/C1) as can be known, K1=k (R1+VR1)/C1 wherein, the value that therefore changes VR1 can change K1 value and V2 value.
This circuit obtains voltage signal V2=-K1di/dt by the current sensor sampling after the U1B computing.With this signal feedback behind control loop, i.e. the output of may command inverter type welder.Change the value of potentiometer VR1, just control the variation of the di/dt of inverter type welder output loop.In order to reduce spatter, the variation of the di/dt when the major control electric current increases.
But the value of this dependence manual shift potentiometer VR1, the method that control inverter type welder output loop di/dt changes is not suitable for digital welding machine.
Summary of the invention:
The purpose of this utility model is exactly to propose a kind of electronic inductor current differential circuit that is applicable to digital welding machine.
For achieving the above object, a kind of electronic inductor current differential of the utility model circuit, comprise: operational amplifier U2, digital regulation resistance U4, capacitor C 1, diode D1, D4, stabilivolt D2, D3, resistance R 3, R4, R5, capacitor C 1 is connected between the negative input end of signal input part and operational amplifier U2, the positive input terminal ground connection of operational amplifier U2, and resistance R 5 is connected between the output terminal and signal output part of operational amplifier U2, after diode D4 and resistance R 4 series connection, stabilivolt D2, D3 is each other after the differential concatenation, the output two ends of digital regulation resistance U4 and diode D1, after resistance R 3 series connection, be connected across respectively between the negative input end and signal output part of operational amplifier U2, the control end of digital regulation resistance U4 connects single-chip microcomputer, and the polarity of diode D4 and diode D1 is towards on the contrary.
The output two ends of above-mentioned digital regulation resistance U4 can be selected earth terminal L and intermediate change end W for use, the negative input end of earth terminal L concatenation operation amplifier U2, and the positive pole of diode D1 is towards signal output part, and the negative pole of diode D4 is towards signal output part.
Also can comprise two phase inverters, be connected on signal input part and signal output part respectively.Described two phase inverters, its each can comprise an operational amplifier and first resistance, second resistance, the input end of phase inverter is through the negative input end of the first resistance concatenation operation amplifier, the output terminal of the output terminal concatenation operation amplifier of phase inverter, second resistance is connected across between the negative input end and output terminal of operational amplifier, the positive input terminal ground connection of operational amplifier.The resistance of described first resistance, second resistance can equate.
The utility model is owing to adopt digital regulation resistance to replace the potentiometer of manual shift, and digital regulation resistance is by Single-chip Controlling, thereby the digitizing that realizes electronic inductor is regulated.
Description of drawings:
Fig. 1 is for using capacity-type electronic reactor ripple control welding machine functional-block diagram;
Fig. 2 is existing capacity-type electronic reactor current differentiating circuit principle sketch;
Fig. 3 is the utility model embodiment circuit theory diagrams.
Embodiment:
Below in conjunction with accompanying drawing the utility model embodiment is described in detail.
In digital welding machine, because the cancellation potentiometer is as input tool, so must adopt other method as the means of regulating di/dt.For the ease of with interface microcontroller, adopt digital regulation resistance to replace VR1, because operating voltage must not be for negative during digital regulation resistance work, maximum operating voltage must not surpass positive 5V+0.5V, Fig. 2 circuit is improved, obtain the utility model embodiment digital electronic reactor current differentiating circuit as shown in Figure 3.
As shown in Figure 3, the utility model embodiment comprises: operational amplifier U1, U2, U3, digital regulation resistance U4, capacitor C 1, diode D1, D4, stabilivolt D2, D3, resistance R 1, R2, R3, R4, R5, R6, R7.The model of digital regulation resistance U4 is selected DS1804-010 for use.
Signal input part V1 series connection is by operational amplifier U1, resistance R 1, the phase inverter that R2 constitutes, signal output part V2 series connection is by operational amplifier U3, resistance R 6, the phase inverter that R7 constitutes, signal input part V1 is through the negative input end 2 of resistance R 1 concatenation operation amplifier U1, resistance R 2 is connected across between the negative input end 2 and output terminal 1 of operational amplifier U1, positive input terminal 3 ground connection of operational amplifier U1, capacitor C 1 is connected between the negative input end 2 of the output terminal 1 of operational amplifier U1 and operational amplifier U2, positive input terminal 3 ground connection of operational amplifier U2, resistance R 5 is connected between the end of the output terminal 1 of operational amplifier U2 and resistance R 6, the negative input end 2 of the anodal concatenation operation amplifier U2 of diode D4, negative pole connects an end of resistance R 4, the other end of resistance R 4 connects the tie point between resistance R 5 and the resistance R 6, the output two ends of digital regulation resistance U4 are selected earth terminal L and intermediate change end W for use, the negative input end 2 of earth terminal L concatenation operation amplifier U2, intermediate change end W connects the negative pole of diode D1, the positive pole of diode D1 connects an end of resistance R 3, the other end of resistance R 3 connects the tie point between resistance R 5 and the resistance R 6, stabilivolt D2, D3 is back-to-back each other after the differential concatenation, be connected across the negative input end 2 of operational amplifier U2 and the tie point between resistance R 5 and the resistance R 6, the control end CS of digital regulation resistance U4, U/D, INC connects the mouth line MCU1 of single-chip microcomputer, MCU2, MCU3, the negative input end 2 of the other end concatenation operation amplifier U3 of resistance R 6, resistance R 7 is connected across between the negative input end 2 and output terminal 1 of operational amplifier U3, positive input terminal 3 ground connection of operational amplifier U3, the output terminal 1 of operational amplifier U3 is signal output part V2.
The principle of work of the utility model embodiment below is described in detail in detail:
U4 is digital regulation resistance DS1804 among Fig. 3, and its 7,2,1 pin connects single-chip microcomputer, sends instruction by single-chip microcomputer and adjusts.L is the digital regulation resistance earth terminal, and W is a digital regulation resistance intermediate change end, and V1 is the current sensor output voltage, and its value is directly proportional with welding current.V1＝KI。V1 is output voltage V c after the anti-phase amplification of operational amplifier U1, and Vc=-(R2/R1) V1 is so owing to R2=R1 Vc=-V1 in the circuit, Vc carries out differential through C1 to voltage signal.Ic=d (V1)/and dt=-Kdi/dt, wherein K is a constant.
Because D2, D3 be the 5.1V stabilivolt, thus V3 voltage be limited in ± 5.7V within.When the welding circuit electric current reduces, promptly di/dt when negative, Ic=d (V1)/dt=-Kdi/dt is being for just, because the unidirectional conducting effect of diode, Ic flow through C1, D4 and R4, though this moment V3 for negative, but because D1 restriction negative voltage can't add to digital regulation resistance W end, this place's voltage is zero.When the welding circuit electric current increases, be that di/dt is timing, according to the operation amplifier circuit theory, as can be known Ic=d (V1)/dt=-Kdi/dt is for negative, Ic flow through R3, D1, digital regulation resistance U4 and C1 because the unidirectional conducting effect of diode, this moment the D4 barrier effect, electric current can't pass through, and D4 and R4 are inoperative.Though D1 conducting this moment, V3 is being for just, and the voltage that therefore adds to digital regulation resistance W end is for just, and owing to the V3 positive voltage is limited within the 5.7V, diode D1 forward voltage drop is about 0.6V, therefore.Digital regulation resistance intermediate change end W ceiling voltage is less than 5.1V (5.7-0.6), thus digital regulation resistance intermediate change end W for negative and output voltage values less than VCC (5V)+0.5V.Thereby digital regulation resistance U4 is operated in the desired safe working environment.Therefore Fig. 3 circuit has been realized the function of Fig. 2 circuit under Single-chip Controlling.The condenser type current differential circuit that replaces potentiometer control in the CO2 shielded welding machine with Fig. 3 circuit; R1=R2, R6=R7 among Fig. 3; amplifier U1 and U3 and peripheral resistance are formed two phase inverters; the phase place that its objective is V1, V2 among the phase place that makes V1 among Fig. 3, V2 and Fig. 2 keeps under the identical prerequisite; digital regulation resistance U4 is operated in the desired safe working environment; the di/dt that guarantees the electric current ascent stage simultaneously is controlled, thereby the digitizing that realizes electronic inductor is regulated.
Claims (5)
1. electronic inductor current differential circuit, it is characterized in that: comprising: operational amplifier U2, digital regulation resistance U4, capacitor C 1, diode D1, D4, stabilivolt D2, D3, resistance R 3, R4, R5, capacitor C 1 is connected between the negative input end of signal input part and operational amplifier U2, the positive input terminal ground connection of operational amplifier U2, resistance R 5 is connected between the output terminal and signal output part of operational amplifier U2, after diode D4 and resistance R 4 series connection, and stabilivolt D2, D3 is each other after the differential concatenation, the output two ends of digital regulation resistance U4 and diode D1, after resistance R 3 series connection, be connected across respectively between the negative input end and signal output part of operational amplifier U2, the control end of digital regulation resistance U4 connects single-chip microcomputer, and the polarity of diode D4 and diode D1 is towards on the contrary.
2. circuit according to claim 1, it is characterized in that: the output two ends of described digital regulation resistance U4 are selected earth terminal L and intermediate change end W for use, the negative input end of earth terminal L concatenation operation amplifier U2, the positive pole of diode D1 is towards signal output part, and the negative pole of diode D4 is towards signal output part.
3. circuit according to claim 1 and 2 is characterized in that: also comprise two phase inverters, be connected on signal input part and signal output part respectively.
4. circuit according to claim 3, it is characterized in that: described two phase inverters, its each comprise an operational amplifier and first resistance, second resistance, the input end of phase inverter is through the negative input end of the first resistance concatenation operation amplifier, the output terminal of the output terminal concatenation operation amplifier of phase inverter, second resistance is connected across between the negative input end and output terminal of operational amplifier, the positive input terminal ground connection of operational amplifier.
5. circuit according to claim 4 is characterized in that: the resistance of described first resistance, second resistance equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202877848U CN201886299U (en) | 2010-08-10 | 2010-08-10 | Current differentiating circuit for electronic reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202877848U CN201886299U (en) | 2010-08-10 | 2010-08-10 | Current differentiating circuit for electronic reactor |
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| CN201886299U true CN201886299U (en) | 2011-06-29 |
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| CN2010202877848U Expired - Lifetime CN201886299U (en) | 2010-08-10 | 2010-08-10 | Current differentiating circuit for electronic reactor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578669A (en) * | 2013-11-15 | 2014-02-12 | 柳州铁道职业技术学院 | Adjustable one-way resistor |
| TWI468701B (en) * | 2011-10-14 | 2015-01-11 | Hon Hai Prec Ind Co Ltd | Testing device and system for resistors |
| CN106170171A (en) * | 2016-08-30 | 2016-11-30 | 中广核达胜加速器技术有限公司 | A kind of wide scope, in high precision, microbeam stream regulation circuit |
-
2010
- 2010-08-10 CN CN2010202877848U patent/CN201886299U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI468701B (en) * | 2011-10-14 | 2015-01-11 | Hon Hai Prec Ind Co Ltd | Testing device and system for resistors |
| CN103578669A (en) * | 2013-11-15 | 2014-02-12 | 柳州铁道职业技术学院 | Adjustable one-way resistor |
| CN106170171A (en) * | 2016-08-30 | 2016-11-30 | 中广核达胜加速器技术有限公司 | A kind of wide scope, in high precision, microbeam stream regulation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU YOUTIAN ELECTROMECHANICAL EQUIPMENT CO., Free format text: FORMER OWNER: GUANGZHOU CH CONTROL TECHNOLOGY CO., LTD. Effective date: 20110811 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 510070 GUANGZHOU, GUANGDONG PROVINCE TO: 510663 GUANGZHOU, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110811 Address after: 510663 Guangdong province high tech Industrial Development Zone of Guangzhou Science City Nanxiang Road No. 11 Patentee after: Guangzhou WeldKing Electric Inc. Address before: 510070 15 Zhong Zhong Road, No. 100, martyrs Middle Road, Guangdong, Guangzhou Patentee before: Guangzhou C.H Control Technology Co., Ltd. |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151204 Address after: Baiyun District of Guangzhou City, Guangdong province 510000 Zhongluotan town center Hongqi Street No. 59 Patentee after: Guangzhou Han Electrical Machinery Co. Ltd. Address before: 510663 Guangdong province high tech Industrial Development Zone of Guangzhou Science City Nanxiang Road No. 11 Patentee before: Guangzhou WeldKing Electric Inc. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20170511 Address after: 511356 Guangdong city of Guangzhou province Luogang District huangqishan Road No. 11 on the third floor (Rostone building) Patentee after: Guangzhou King Welding Mechanical & Electrical Equipment Co., Ltd. Address before: Baiyun District of Guangzhou City, Guangdong province 510000 Zhongluotan town center Hongqi Street No. 59 Patentee before: Guangzhou Han Electrical Machinery Co. Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110629 |
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| CX01 | Expiry of patent term |