CN202894542U - Two-transistor forward soft switch contravariant manual electric-arc welder - Google Patents
Two-transistor forward soft switch contravariant manual electric-arc welder Download PDFInfo
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- CN202894542U CN202894542U CN 201220442656 CN201220442656U CN202894542U CN 202894542 U CN202894542 U CN 202894542U CN 201220442656 CN201220442656 CN 201220442656 CN 201220442656 U CN201220442656 U CN 201220442656U CN 202894542 U CN202894542 U CN 202894542U
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Abstract
The utility model discloses a two-transistor forward soft switch contravariant manual electric-arc welder which comprises a power source, a power source protection circuit, a rectifier and filter circuit, a main circuit, a main transformer, an output circuit, a pulse width modulation (PWM) control circuit and a drive circuit. The power source is connected with the power source protection circuit, an output current of the power source protection circuit is accessed to the main circuit after being processed through the rectifier and filter circuit, the main circuit is connected with the main transformer, the other end of the main transformer is connected with the output circuit, the drive circuit is connected with the PWM control circuit, the main circuit comprises four power amplifier tubes which are marked as IGBTQ1-IGBTQ4, the IGBTQ1 is in parallel connection with the IGBTQ2, the IGBTQ3 is in parallel connection with the IGBTQ4, two groups of switching tubes are formed, and a soft switching network is arranged between the two groups of the switching tubes of the main circuit. Due to the fact that the soft switching network is additionally arranged in the main circuit of the electric-arc welder, the power amplifier tubes are effectively protected, the electric-arc welder is enabled to work safely and stably, and the load rate of the electric-arc welder is further improved.
Description
Technical field
The present invention relates to a kind of hand arc welding machine, be specifically related to a kind of double tube positive exciting soft-switching inversion hand arc welding machine.
Background technology
The electric welding machine of domestic market is mainly take the technology of positive activation type, semibridge system and full-bridge as main, present producer adopts double tube positive exciting more for the positive activation type electric welding machine, double tube positive exciting is as a kind of inversion transformation technique, in the small power electric welding machine, use more (below the 200A), but the load factor of double tube positive exciting condenser discharge welder in the market is lower, and the job stability of power tube is still waiting to improve.
Summary of the invention
The object of the invention is to provide a kind of double tube positive exciting soft-switching inversion hand arc welding machine, but the load factor of its this arc welder of Effective Raise, and effectively protect power tube, improve the job stability of machine.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of double tube positive exciting soft-switching inversion hand arc welding machine; comprise power supply; power protecting circuit; current rectifying and wave filtering circuit; main circuit; main transformer; output circuit; pwm control circuit and drive circuit; power supply links to each other with power protecting circuit; the output current of power protecting circuit accesses main circuit after current rectifying and wave filtering circuit is processed; main circuit links to each other with main transformer; the other end of main transformer links to each other with output circuit; drive circuit links to each other with pwm control circuit; described main circuit comprises four power tube IGBT Q1 ~ Q4; Q1 is in parallel with Q2; two groups of switching tubes of Q3 formation in parallel with Q4; between two groups of switching tubes of main circuit, be provided with soft switching network; described soft switching network comprises diode D1; diode D2; inductance L 1 and capacitor C 1; the negative pole of diode D2 connects the drain electrode of Q1; the positive pole of diode D2 is connected with inductance L 1; the other end of inductance L 1 connects the negative pole of diode D1; the positive pole of diode D1 connects the drain electrode of Q3; one end of capacitor C 1 links to each other with the positive pole of diode D2; the other end of capacitor C 1 connects the source electrode of Q3; Q1; one end of the primary coil of the drain electrode main transformer of Q2 links to each other, Q1; the other end of the primary coil of the drain electrode main transformer of Q2 links to each other.
As optimization, described pwm control circuit produces the needed drive waveforms of power tube of main circuit part.
With respect to scheme of the prior art, advantage of the present invention is:
Double tube positive exciting soft-switching inversion hand arc welding machine described in the invention by soft switching network, is protected power tube effectively, and the arc welder that is can be worked with security and stability, and then improves the load factor of arc welder.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is the schematic block circuit diagram of existing double tube positive exciting inversion hand arc welding machine;
Fig. 2 is the schematic block circuit diagram of the embodiment of the invention;
Fig. 3 is the drive waveforms of drive circuit in the prior art;
Fig. 4 is the drive waveforms of drive circuit in the embodiment of the invention.
Fig. 5 is the schematic diagram of drive circuit in the embodiment of the invention;
Fig. 6 is the input waveform of drive circuit in the embodiment of the invention;
Fig. 7 is the output waveform of drive circuit in the embodiment of the invention.
The specific embodiment
Below in conjunction with specific embodiment such scheme is described further.Should be understood that these embodiment are not limited to limit the scope of the invention for explanation the present invention.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment:
The present embodiment has been described a kind of double tube positive exciting soft-switching inversion hand arc welding machine; as shown in Figure 2; it comprises the 230V power supply; power protecting circuit; current rectifying and wave filtering circuit; main circuit; main transformer; output circuit; pwm control circuit and drive circuit; power supply links to each other with power protecting circuit; the output current of power protecting circuit accesses main circuit after current rectifying and wave filtering circuit is processed; main circuit links to each other with main transformer; the other end of main transformer links to each other with output circuit; drive circuit links to each other with pwm control circuit; described main circuit comprises four power tube IGBT Q1 ~ Q4; Q1 is in parallel with Q2; two groups of switching tubes of Q3 formation in parallel with Q4; between two groups of switching tubes of main circuit, be provided with soft switching network; described soft switching network comprises diode D1; diode D2; inductance L 1 and capacitor C 1; the negative pole of diode D2 connects the drain electrode of Q1; the positive pole of diode D2 is connected with inductance L 1; the other end of inductance L 1 connects the negative pole of diode D1; the positive pole of diode D1 connects the drain electrode of Q3; one end of capacitor C 1 links to each other with the positive pole of diode D2; the other end of capacitor C 1 connects the source electrode of Q3; Q1; one end of the primary coil of the drain electrode main transformer of Q2 links to each other, Q1; the other end of the primary coil of the drain electrode main transformer of Q2 links to each other.
In addition, also be provided with two RCD networks that are comprised of resistance R 1, diode D3, capacitor C 2 and resistance R 2, diode D4, capacitor C 3 in the main circuit part, described RCD network absorption power tube is opened the spike when turn-offing, and power tube is played effectively protection.Power tube is effectively protected in the two combinations in soft switching network and RCD networking, guarantees the arc welder safe and stable operation.
Described pwm control circuit produces the needed drive waveforms of power tube of main circuit part.Existing drive waveforms as shown in Figure 3, wave-shape amplitude is+the rectangle square wave of 15V/-10V, and drive waveforms that the present embodiment produces is on 0 line+the rectangle square wave of 15V, as shown in Figure 4, the front and back of waveform can effectively reduce power tube and open turn-off power loss along more precipitous after improving.
The operation principle of drive circuit is as follows: concrete drive circuit as shown in Figure 5, A-B is the Waveform Input end, its input waveform as shown in Figure 6, a-b is output waveform, its output waveform as shown in Figure 7.When the waveform of input was A+/B-, waveform was delivered to the grid that a end is added to power tube by diode D1, diode D2, and wherein triode Q does not work; When the waveform of input was B+/A-, diode D1, diode D2 oppositely ended, and triode Q saturation conduction makes short circuit between a, b, and the waveform between output ab just is 0 like this.More than for being theoretical waveform, and in side circuit, the output waveform between a-b then as shown in Figure 4.
Above-mentioned example only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the people who is familiar with technique can understand content of the present invention and according to this enforcement, can not limit protection scope of the present invention with this.All equivalent transformations that Spirit Essence is done according to the present invention or modification all should be encompassed within protection scope of the present invention.
Claims (1)
1. double tube positive exciting soft-switching inversion hand arc welding machine; comprise power supply; power protecting circuit; current rectifying and wave filtering circuit; main circuit; main transformer; output circuit; pwm control circuit and drive circuit; power supply links to each other with power protecting circuit; the output current of power protecting circuit accesses main circuit after current rectifying and wave filtering circuit is processed; main circuit links to each other with main transformer; the other end of main transformer links to each other with output circuit; drive circuit links to each other with pwm control circuit; described main circuit comprises four power tube IGBT Q1 ~ Q4; Q1 is in parallel with Q2; two groups of switching tubes of Q3 formation in parallel with Q4; it is characterized in that; between two groups of switching tubes of main circuit, be provided with soft switching network; described soft switching network comprises diode D1; diode D2; inductance L 1 and capacitor C 1; the negative pole of diode D2 connects the drain electrode of Q1; the positive pole of diode D2 is connected with inductance L 1; the other end of inductance L 1 connects the negative pole of diode D1; the positive pole of diode D1 connects the drain electrode of Q3; one end of capacitor C 1 links to each other with the positive pole of diode D2; the other end of capacitor C 1 connects the source electrode of Q3; Q1; one end of the primary coil of the drain electrode main transformer of Q2 links to each other, Q1; the other end of the primary coil of the drain electrode main transformer of Q2 links to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220442656 CN202894542U (en) | 2012-08-31 | 2012-08-31 | Two-transistor forward soft switch contravariant manual electric-arc welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220442656 CN202894542U (en) | 2012-08-31 | 2012-08-31 | Two-transistor forward soft switch contravariant manual electric-arc welder |
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| Publication Number | Publication Date |
|---|---|
| CN202894542U true CN202894542U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220442656 Expired - Fee Related CN202894542U (en) | 2012-08-31 | 2012-08-31 | Two-transistor forward soft switch contravariant manual electric-arc welder |
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| CN (1) | CN202894542U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102784999A (en) * | 2012-08-31 | 2012-11-21 | 苏州市双马机电有限公司 | Two-transistor forward soft-switching inverter manual electric arc welder |
-
2012
- 2012-08-31 CN CN 201220442656 patent/CN202894542U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102784999A (en) * | 2012-08-31 | 2012-11-21 | 苏州市双马机电有限公司 | Two-transistor forward soft-switching inverter manual electric arc welder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20140831 |
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| EXPY | Termination of patent right or utility model |