CN203944975U - For the open-phase protection circuit of inverter type welder - Google Patents
For the open-phase protection circuit of inverter type welder Download PDFInfo
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- CN203944975U CN203944975U CN201420335765.6U CN201420335765U CN203944975U CN 203944975 U CN203944975 U CN 203944975U CN 201420335765 U CN201420335765 U CN 201420335765U CN 203944975 U CN203944975 U CN 203944975U
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- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 238000003466 welding Methods 0.000 description 8
- 230000002950 deficient Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The utility model discloses a kind of open-phase protection circuit for inverter type welder, it is characterized in that, comprise: the three-phase commutation bridge being connected with input voltage, the output of this three-phase commutation bridge connects an optocoupler U2, the input of this optocoupler U2 is connected with the base stage of a triode Q1, and the emitter stage of this triode Q1 connects the electrode input end of a capacitor C 3 and a comparator; In the time that this input voltage is normal, this optocoupler U2 conducting, this triode Q1 cut-off, this comparator is exported a high level signal; When this input voltage occurs phase shortage or when single-phase, not conducting of this optocoupler U2, this triode Q1 conducting, this comparator is exported a low level signal.
Description
Technical field
The utility model relates to a kind of welding machine technical field, relates in particular to a kind of open-phase protection circuit for inverter type welder based on waveform sampling.
Background technology
The course of work of inversion welding and cutting device, after three-phase or single-phase 50Hz industrial frequency AC electric rectification, filtering, to obtain a more level and smooth direct current, the inverter circuit being made up of IGBT or FET becomes this direct current in the alternating current of 15～100kHz, after the step-down of intermediate frequency main transformer, rectifying and wave-filtering obtains the output of direct current stably welding current (or the alternating current of required frequency is exported in inversion again) again.The control circuit of inversion welding and cutting device is made up of given circuit and drive circuit etc., by the feedback of voltage, current signal is processed, realize complete machine loop control, adopt the control technology that pulse-width modulation PWM is core, thereby obtain the constant-current characteristics of quick pulsewidth modulation and excellent welding technological effect.
Open-phase protection circuit due to electrical network self reason or power supply input wires unreliable, there is sometimes the situation of phase-deficient operation in Switching Power Supply, and phase-deficient operation be difficult for found in time.When power supply is during in phase-deficient operation, a certain arm no current of rectifier bridge, and other arm can cause damage by serious overcurrent, makes inverter work occur abnormal simultaneously, therefore must protect phase shortage.
Connect because traditional open-phase protection circuit adopts each phase optocoupler, output adopts more majority gate processing, circuit complexity, and cost is higher, and circuit footprint is large, is not easy to microprocessor signals and adopts detection.So, become the development trend of follow-up electric welding machine inverter based on three-phase and monophasic waveform phase shortage circuit protection.
Utility model content
In order to overcome the defect existing in prior art, the utility model provides a kind of open-phase protection circuit for inverter type welder based on waveform sampling simple in structure.
In order to realize above-mentioned utility model object, the utility model discloses a kind of open-phase protection circuit for inverter type welder, it is characterized in that, comprise: the three-phase commutation bridge being connected with input voltage, the output of this three-phase commutation bridge connects an optocoupler U2, the input of this optocoupler U2 is connected with the base stage of a triode Q1, and the emitter stage of this triode Q1 connects the electrode input end of a capacitor C 3 and a comparator; In the time that this input voltage is normal, this optocoupler U2 conducting, this triode Q1 cut-off, this comparator is exported a high level signal; When this input voltage occurs phase shortage or when single-phase, not conducting of this optocoupler U2, this triode Q1 conducting, this comparator is exported a low level signal.
Further, this three-phase commutation bridge is by inductance L 1 ground connection.
Further, the output of this three-phase commutation bridge is connected with the photophore of this optocoupler after a resistance R 6, R3.
Further, after the output of this resistance R 6 capacitor C 2 in parallel, diode D5, pass through resistance R 11 ground connection.
Further, the output of this optocoupler is connected with the base stage of this triode Q1 by a resistance R 7.
Further, the input of this resistance R 7 resistance R 10 in parallel and capacitor C 5, the equal ground connection of colelctor electrode of this resistance R 10, capacitor C 5, capacitor C 3 and this triode Q1.
Further, the negative input of this comparator comprises a resistance R 5 and capacitor C 4 rear circuit of connecting with resistance R 9 in parallel, these resistance R 9 ground connection.
Further, the output of this comparator connects a resistance R 4.
Further, the output of this resistance R 4 resistance R 8 in parallel, capacitor C 1 and Zener diode D4.
Compared with prior art; phase shortage simple circuit provided by the utility model understands; save cost; it is little that circuit takies real space; reduce the processing of more gate signal; circuit is stable, facilitates the control of butt welding machine inverter and overcurrent protection time fast, output signal and microprocessor seamless link.
Brief description of the drawings
Can describe in detail and appended graphic being further understood by following utility model about advantage of the present utility model and spirit.
Fig. 1 is the structural representation of the related open-phase protection circuit of the utility model;
Fig. 2 is phase shortage or the individual event charging that is, the schematic diagram of discharge curve.
Detailed description of the invention
Describe specific embodiment of the utility model in detail below in conjunction with accompanying drawing.
Open-phase protection circuit provided by the utility model is connected input voltage with the three-phase commutation bridge of a detection waveform, when voltage is normal, and output one high level signal, when voltage occurs phase shortage or when single-phase, output one low level signal.
Fig. 1 is the structural representation of the related open-phase protection circuit of the utility model.As shown in Figure 1, the input of this open-phase protection circuit connects a three-phase voltage VIN.The three-phase of three-phase voltage VIN connects respectively at diode D1, D2, D3, D6, D7, D8, forms a three-phase commutation bridge, and one end of three-phase commutation bridge is by an inductance L ground connection GND3.Three-phase commutation bridge is for detection of the voltage waveform of input signal VIN.Because input voltage has two kinds of three-phase voltage and single-phase voltages, adopt three-phase commutation bridge, because the virtual value fluctuation range of actual electric network three-phase voltage is all in 20% scope left and right, according to the minimum point design resistance value R6 of fluctuation voltage, R3, R11.As shown in fig. 1, input voltage VIN waveform through three-phase commutation bridge detect after through resistance R 6, R3 as the input of optocoupler U2 after contact resistance R11 ground connection GND3.The input of the output of resistance R 6 and resistance R 11 is directly gone back shunt capacitance C2 and diode D5.
The output of optocoupler U2 is connected with a triode Q1.The output of optocoupler U2 is connected with the base stage of triode Q1 through a resistance R 7.The emitter stage of triode Q1 connects the positive pole of a comparator U1A.The output of optocoupler U2 and a resistance R 10 in parallel and capacitor C 5.The emitter stage of resistance R 10, capacitor C 5 and triode Q1 is all connected a ground connection GND0.The negative pole of comparator U1A connects a 15V voltage and process resistance R 9 dividing potential drops in parallel with a resistance R 5 and capacitor C 4.The output of comparator U1A ground connection GND0 after a resistance R 8 in parallel, capacitor C 1, Zener diode D4 after resistance R 4.
Now optocoupler U2 is in conducting state always, and Q1 PNP triode ends always, the comparator output high level of U1A, thus the normal work of control inverter and microprocessor control signal are normal.If but when the input of phase shortage or actual single-phase electricity, because single-phase electricity (or phase shortage) voltage effective value is lower than the actual minimum point of three-phase voltage, now optocoupler U2 is in not on-state, or single-phase 380V voltage is owing to differing 180 degree between sinusoidal voltage crest, therefore voltage can be got back to the process of crest from crest to zero point.But zero point, optocoupler U2 is in cut-off state at voltage, the conducting of Q1 PNP triode, U1A comparator output low level represent phase shortage or input voltage incorrect.Because optocoupler can arrive zero point at sinusoidal voltage, now consider that optocoupler U2 is output as pulse signal, so use R1 and C3 buffer circuit between the collector and emitter of triode, because the time constant of charging is very large, triode conducting be equivalent to discharge loop, now time constant is the impedance composition of capacitor C 3 and triode saturation conduction.Because triode conduction impedance is approximately infinitely small, so electric discharge constant is far smaller than charging constant, in the time that transistor base provides pulse signal by optocoupler, C3 discharges far away faster than the charging interval, transistor collector voltage is always in low level, the low level signal of comparator stable output.
Fig. 2 is in the time of phase shortage or when input single-phase power supply, R1, C3 charging curve 201, and C3, triode conducting resistance rce level off to 0 composition discharge curve 202 as shown in the figure, obviously in the situation that triode pulse is inputted, C3 electric capacity both end voltage is low level, is far smaller than comparator cathode voltage V-.
Compared with prior art; phase shortage simple circuit provided by the utility model understands; save cost; it is little that circuit takies real space; reduce the processing of more gate signal; circuit is stable, facilitates the control of butt welding machine inverter and overcurrent protection time fast, output signal and microprocessor seamless link.
Described in this description is preferred embodiment of the present utility model, and above embodiment is only in order to the technical solution of the utility model to be described but not to restriction of the present utility model.All those skilled in the art comply with design of the present utility model by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within scope of the present utility model.
Claims (9)
1. the open-phase protection circuit for inverter type welder, it is characterized in that, comprise: the three-phase commutation bridge being connected with input voltage, the output of described three-phase commutation bridge connects an optocoupler U2, the input of described optocoupler U2 is connected with the base stage of a triode Q1, and the emitter stage of described triode Q1 connects the electrode input end of a capacitor C 3 and a comparator; In the time that described input voltage is normal, described optocoupler U2 conducting, described triode Q1 cut-off, described comparator is exported a high level signal; When described input voltage occurs phase shortage or when single-phase, not conducting of described optocoupler U2, described triode Q1 conducting, described comparator is exported a low level signal.
2. the open-phase protection circuit for inverter type welder as claimed in claim 1, is characterized in that, described three-phase commutation bridge is by inductance L 1 ground connection.
3. the open-phase protection circuit for inverter type welder as claimed in claim 1, is characterized in that, the output of described three-phase commutation bridge is connected with the photophore of described optocoupler after a resistance R 6, R3.
4. the open-phase protection circuit for inverter type welder as claimed in claim 3, is characterized in that, after the output of described resistance R 6 capacitor C 2 in parallel, diode D5 by resistance R 11 ground connection.
5. the open-phase protection circuit for inverter type welder as claimed in claim 1, is characterized in that, the output of described optocoupler is connected with the base stage of described triode Q1 by a resistance R 7.
6. the open-phase protection circuit for inverter type welder as claimed in claim 5, is characterized in that, an input resistance R 10 in parallel and the capacitor C 5 of described resistance R 7, the equal ground connection of colelctor electrode of described resistance R 10, capacitor C 5, capacitor C 3 and described triode Q1.
7. the open-phase protection circuit for inverter type welder as claimed in claim 1, is characterized in that, the negative input of described comparator comprises a resistance R 5 and capacitor C 4 rear circuit of connecting with resistance R 9 in parallel, described resistance R 9 ground connection.
8. the open-phase protection circuit for inverter type welder as claimed in claim 1, is characterized in that, the output of described comparator connects a resistance R 4.
9. the open-phase protection circuit for inverter type welder as claimed in claim 8, is characterized in that, an output resistance R 8 in parallel, capacitor C 1 and the Zener diode D4 of described resistance R 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335765.6U CN203944975U (en) | 2014-06-23 | 2014-06-23 | For the open-phase protection circuit of inverter type welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335765.6U CN203944975U (en) | 2014-06-23 | 2014-06-23 | For the open-phase protection circuit of inverter type welder |
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| Publication Number | Publication Date |
|---|---|
| CN203944975U true CN203944975U (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420335765.6U Expired - Fee Related CN203944975U (en) | 2014-06-23 | 2014-06-23 | For the open-phase protection circuit of inverter type welder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057181A (en) * | 2014-06-23 | 2014-09-24 | 上海威特力焊接设备制造股份有限公司 | Open-phase protection circuit for inverter welding machine |
| CN107979065A (en) * | 2017-12-29 | 2018-05-01 | 深圳市汇业达通讯技术有限公司 | A kind of open-phase protection circuit and its control method |
-
2014
- 2014-06-23 CN CN201420335765.6U patent/CN203944975U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057181A (en) * | 2014-06-23 | 2014-09-24 | 上海威特力焊接设备制造股份有限公司 | Open-phase protection circuit for inverter welding machine |
| CN107979065A (en) * | 2017-12-29 | 2018-05-01 | 深圳市汇业达通讯技术有限公司 | A kind of open-phase protection circuit and its control method |
| CN107979065B (en) * | 2017-12-29 | 2024-05-14 | 深圳市汇业达通讯技术有限公司 | Phase-failure protection circuit and control method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141119 Termination date: 20180623 |