CN201371304Y - Portable IGBT (insulated-gate bipolar transistor) inverter electric-arc welding machine - Google Patents
Portable IGBT (insulated-gate bipolar transistor) inverter electric-arc welding machine Download PDFInfo
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- CN201371304Y CN201371304Y CN200920006701U CN200920006701U CN201371304Y CN 201371304 Y CN201371304 Y CN 201371304Y CN 200920006701 U CN200920006701 U CN 200920006701U CN 200920006701 U CN200920006701 U CN 200920006701U CN 201371304 Y CN201371304 Y CN 201371304Y
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Abstract
The utility model provides a portable IGBT (insulated-gate bipolar transistor) inverter electric-arc welding machine which has the advantages of high reliability, small size and low cost. The inverter electric-arc welding machine comprises a main circuit, and a control circuit and an auxiliary power supply circuit which are connected with the main circuit; the main circuit comprises an input rectification filter circuit, an inverter circuit, a high-frequency main transformer and a secondary output rectification circuit in sequence; and the control circuit comprises a PWM (pulse-width modulation) regulating circuit, an IGBT driving circuit, a current feedback circuit, and a current given circuit. The inverter electric-arc welding machine is characterized in that the inverter circuit adopts a full-bridge hard switching structure; insulated-gate bipolar transistors (IGBTs) G1 and G3 as well as G2 and G4 form bridge arms; the bridge arms are conducted sequentially and alternately, so as to convert DC into high-frequency square wave AC, and rectify and output low-voltage DC after passing through the high-frequency main transformer; resistors and capacitors, which are connected in parallel at two ends of the IGBTs, adopt peak voltage absorption networks; the high-frequency main transformer adopts microcrystal alloy iron core; an insulating layer which is high-voltage resistant and high-temperature resistant is arranged between a primary coil and a secondary coil; and the PWM regulating circuit adopts a double-ended output current controlled pulse width modulator chip.
Description
Technical field
The utility model relates to a kind of inverter arc welding machine, especially a kind of portable type IGBT invert arc-welding machine.
Background technology
Existing small electrical arc-welding machine generally is to adopt power field effect pipe (hereinafter to be referred as the field pipe) as main switching device, so this inverter arc welding machine exists, and following some is not enough.The first is subjected to single pipe can't produce very big electric current to limit, and this welding machine need be managed parallel connection with a plurality of, thereby has increased the possibility that welding machine breaks down.It two is because reverse frequency is higher, and it is higher to make that a pipe and fast recovery diode generate heat, and is subjected to the main transformer structure to limit its heat to shed fast, though reverse frequency is higher, but the welding machine of the equal equal arcing time factor of electric current, radiator and blower fan are very big, thereby are difficult to realize the volume miniaturization.It three is because a pipe is more, reason such as radiator and blower fan volume are all bigger, and its cost is higher under equal parameter.
The utility model content
The purpose of this utility model provides a kind of reliability height, volume is little, cost is low portable type IGBT invert arc-welding machine.
To achieve these goals, the technical solution adopted in the utility model is, a kind of portable type IGBT invert arc-welding machine, this portable type IGBT invert arc-welding machine comprise,
Main circuit and connected control circuit and auxiliary power circuit,
The main circuit order comprises the input rectifying filter circuit successively, inverter circuit, and high frequency main transformer, the secondary output rectification circuit, main circuit becomes direct current with the 50Hz civil power by rectification, becomes high-frequency ac by inversion again, and it is used that the secondary rectification becomes direct current confession welding again,
Control circuit comprises the PWM regulating circuit, the IGBT drive circuit, current feedback circuit, the electric current given circuit, the welding current value that the user sets is that electric current is given, the given current feedback signal that obtains with current divider sampling of electric current enters current regulator and compares and obtain error voltage, error voltage control PWM regulating circuit produces the pulse signal of certain width, this pulse drives the insulation gate pole bipolar transistor IGBT of main circuit by the IGBT drive circuit, obtain welding current by main circuit again, it is characterized in that
This inverter circuit adopts full-bridge hard switching structure, the brachium pontis of gate pole bipolar transistor IGBT G1, G3 and G2, the G4 formation sequential turn-on that wherein insulate, their alternate conduction become direct current into high frequency square wave and exchange, by rectification output low-voltage direct after the high frequency main transformer, IGBT two ends institute parallel resistor electric capacity is that peak voltage absorbs network
This high frequency main transformer plays the effect of power transmission and electrical isolation in circuit, this high frequency main transformer is used microcrystallizing alloy iron core, just, be provided with high pressure resistant, temperature-resistant insulation layer between the secondary coil,
The PWM regulating circuit adopts both-end output current control type pulse width modulator chip U2.
As preferably, it is both-end output current control type pulse width modulator chip U2 that described PWM regulates chip, and its model is KA3846, and this KA3846 adopts peak point current control mode, realizes the control of pulse one by one.
As preferably, the IGBT drive circuit is insulation gate pole bipolar transistor IGBT in the inverter circuit and the interface between the control circuit, to realize isolation, amplification and the protection to pwm signal.
The utility model is because inverter circuit has adopted full-bridge hard switching structure commonly used, by insulation gate pole bipolar transistor IGBT G1, G3 and G2, G4 constitutes the brachium pontis of sequential turn-on, IGBT is as third generation power device, combine the advantage of FET and large power triode GTR, it is big to have single capacity, switching loss is little, withstand voltage height, Heat stability is good, drive advantages such as easy, the advantage the utility model that has benefited from IGBT does not need multitube parallel, and then improved the reliability of welding machine, need not very big radiator and blower fan because caloric value is low again, dwindled the volume of complete machine greatly.Because high frequency main transformer of the present utility model is used the microcrystallizing alloy iron core, the first utmost point adopts high pressure resistant, resistant to elevated temperatures insulating materials, have that power density is big, heat radiation easily, be easy to advantage such as installation, because becoming to exchange, direct current is instant inversion, the frequency that exchanges in this process is very high, tens KHzs are generally arranged, because frequency is very high to make the number of turn of main transformer seldom iron core is also very little, and then making the welding machine volume little, in light weight, the loss of transformer is also very little simultaneously can improve overall efficiency.What the current control mode pulse width modulator chip KA3846 that the utility model is exported owing to both-end adopted is peak-current mode control method, the advantage of this current-mode control mode, and the one, pulse control one by one, dynamic response is fast, output accuracy is high, good stability; The 2nd, have the protective capability of transient state, can effectively prevent the IGBT overcurrent; The 3rd, can prevent the generation of high frequency main transformer magnetic bias, if serious magnetic bias can make IGBT even main transformer damage.The utility model is just because of having adopted KA3846, and the functional reliability of complete machine just is improved.In sum, the utility model reliable operation, volume is small and exquisite, cost is lower.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is a circuitry schematic diagram of the present utility model, comprises main circuit and interlock circuit square frame thereof;
Fig. 2 is the circuit diagram of main circuit shown in Fig. 1;
Fig. 3 is the PWM Principles of Regulation figure in the control circuit shown in Fig. 1;
Fig. 4 is the IGBT drive circuit schematic diagram in the control circuit shown in Fig. 1;
Fig. 5 is current feedback and electric current given circuit schematic diagram in the control circuit shown in Fig. 1;
Fig. 6 is the schematic diagram of auxiliary power circuit shown in Fig. 1.
The specific embodiment
As shown in Figure 1, the utility model portable type IGBT invert arc-welding machine comprises main circuit and connected control circuit and auxiliary power circuit, in Fig. 1, main circuit is meant the circuit beyond control circuit, driver module and the auxiliary power circuit square frame, and driver module is the IGBT drive circuit.
As shown in Figure 2, the main circuit order comprises the input rectifying filter circuit, inverter circuit, high frequency main transformer, secondary output rectification circuit successively.Main circuit is the most basic in the welding machine, most important parts, and its major function is that the civil power alternating current is transformed into the used direct current of welding.Main circuit is the main body that realizes inversion, the inversion process is that the 50Hz civil power is become direct current by rectification, become high-frequency ac by inversion again, the secondary rectification becomes direct current, and wherein the direct current change exchanges and is instant inversion, and the frequency that exchanges in this process is very high, tens KHzs are generally arranged, because frequency is very high to make the number of turn of main transformer seldom iron core is also very little, and then makes the welding machine volume little, in light weight, the loss of transformer is also very little simultaneously can improve overall efficiency.
As shown in Figure 2, the input rectifying filter circuit comprises that power switch, rectifier bridge, combined floodgate surge restriction circuit, filter circuit connect and compose.It mainly acts on is to provide DC voltage more stably for inverter circuit.
As shown in Figure 2, inverter circuit adopts full-bridge hard switching structure commonly used.IGBT G1, G3 and G2, G4 constitute the brachium pontis of sequential turn-on, and their alternate conduction become direct current into high frequency square wave and exchange, by rectification output low-voltage direct after the high frequency main transformer.IGBT two ends institute parallel resistor electric capacity is that peak voltage absorbs network, and its effect is that the peak voltage that causes because of the main transformer leakage inductance when switching tube is turn-offed sponges, and can prevent IGBT overvoltage damage.The main switching device that the utility model adopted is IGBT, insulation gate pole bipolar transistor IGBT is as third generation power device, combine the advantage of FET and large power triode GTR, have that single capacity is big, an advantage such as low, the withstand voltage height of the little caloric value of switching loss, Heat stability is good, driving are easy.The advantage the utility model that has benefited from it does not need multitube parallel, and then has improved the reliability of welding machine, need not very big radiator and blower fan because caloric value is low again, has dwindled the volume of complete machine greatly.
As shown in Figure 2, high frequency main transformer plays the effect of power transmission and electrical isolation in circuit.The big heating height of its transmitted power has very high insulating properties again in welding machine, is most important and the very high parts of cost proportion.High frequency main transformer of the present utility model is used the microcrystallizing alloy iron core, and the first utmost point adopts high pressure resistant, resistant to elevated temperatures insulating materials, have that power density is big, heat radiation easily, be easy to advantage such as installation.
As shown in Figure 2, the secondary output rectification circuit is that the high-frequency ac electric rectification with low pressure is a direct current, just can be used for afterwards having welded.Because the very high fast recovery diode that used of a-c cycle.
Control circuit, it realizes the control of butt welding termination process, described control circuit comprises PWM adjusting, IGBT drive circuit, current feedback circuit, electric current given circuit.The welding current value that the given user of being of electric current sets, the current feedback signal that it obtains with current divider sampling enters current regulator and compares and obtain error voltage, error voltage control PWM regulating circuit produces the pulse signal of certain width, this pulse obtains welding current by main circuit again by the IGBT of IGBT drive circuit driving main circuit.The utility model control circuit is as follows by contained content division:
As shown in Figure 3, the PWM regulating circuit has adopted PWM to regulate chip U2, and its model is KA3846.This is a kind of current control mode pulse width modulator chip of both-end output.What KA3846 adopted is peak-current mode control method, and the current-mode control mode has following advantage: the one, and pulse control one by one, dynamic response is fast, output accuracy is high, good stability.The 2nd, have the protective capability of transient state, can effectively prevent the IGBT overcurrent.The 3rd, can prevent the generation of high frequency main transformer magnetic bias.If serious magnetic bias can make IGBT even main transformer damage.The utility model is just because of having adopted KA3846, and the functional reliability of complete machine is improved.
As shown in Figure 4, the IGBT drive circuit is the interface (consulting Fig. 1 driver module is the IGBT drive circuit) between IGBT and the control circuit, realizes isolation, amplification and protection to pwm signal, and drive circuit plays important effect to the operate as normal of IGBT.That the utility model uses is driving transformer T1, and it can prevent the straight-through damage of IGBT effectively, and low price, and then has improved reliability, has reduced cost.
As shown in Figure 5, current feedback, electric current given circuit, the utility model is a manual welding machine, and external characteristics belongs to constant current needs the feedback current amount, and the current sampling device of this welding machine is a current divider, and its cost low-response speed is fast.
As shown in Figure 6, auxiliary power circuit, it provides control circuit required low-voltage dc power supply.What accessory power supply of the present utility model adopted is single-ended reverse exciting switching voltage regulator.
Claims (3)
1. portable type IGBT invert arc welding machine, this portable type IGBT invert arc welding machine comprise,
Main circuit and connected control circuit and auxiliary power circuit,
The main circuit order comprises the input rectifying filter circuit successively, inverter circuit, and high frequency main transformer, the secondary output rectification circuit, main circuit becomes direct current with the 50Hz civil power by rectification, becomes high-frequency ac by inversion again, and it is used that the secondary rectification becomes direct current confession welding again,
Control circuit comprises the PWM regulating circuit, the IGBT drive circuit, current feedback circuit, the electric current given circuit, the welding current value that the user sets is that electric current is given, the given current feedback signal that obtains with current divider sampling of electric current enters current regulator and compares and obtain error voltage, error voltage control PWM regulating circuit produces the pulse signal of certain width, this pulse drives the insulation gate pole bipolar transistor IGBT of main circuit by the IGBT drive circuit, obtain welding current by main circuit again, it is characterized in that
This inverter circuit adopts full-bridge hard switching structure, the brachium pontis of gate pole bipolar transistor IGBT G1, G3 and G2, the G4 formation sequential turn-on that wherein insulate, their alternate conduction become direct current into high frequency square wave and exchange, by rectification output low-voltage direct after the high frequency main transformer, IGBT two ends institute parallel resistor electric capacity is that peak voltage absorbs network
This high frequency main transformer plays the effect of power transmission and electrical isolation in circuit, this high frequency main transformer is used microcrystallizing alloy iron core, just, be provided with high pressure resistant, temperature-resistant insulation layer between the secondary coil,
The PWM regulating circuit adopts both-end output current control type pulse width modulator chip U2.
2. portable type IGBT invert arc welding machine as claimed in claim 1, it is characterized in that it is both-end output current control type pulse width modulator chip U2 that described PWM regulates chip, its model is KA3846, this KA3846 adopts the peak point current control mode, realizes the control of pulse one by one.
3. portable type IGBT invert arc welding machine as claimed in claim 1 is characterized in that, the IGBT drive circuit is insulation gate pole bipolar transistor IGBT in the inverter circuit and the interface between the control circuit, to realize isolation, amplification and the protection to pwm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920006701U CN201371304Y (en) | 2009-03-04 | 2009-03-04 | Portable IGBT (insulated-gate bipolar transistor) inverter electric-arc welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920006701U CN201371304Y (en) | 2009-03-04 | 2009-03-04 | Portable IGBT (insulated-gate bipolar transistor) inverter electric-arc welding machine |
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|---|---|
| CN201371304Y true CN201371304Y (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920006701U Expired - Lifetime CN201371304Y (en) | 2009-03-04 | 2009-03-04 | Portable IGBT (insulated-gate bipolar transistor) inverter electric-arc welding machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102039474A (en) * | 2010-12-07 | 2011-05-04 | 上海瑞凌电器有限公司 | Single-tube insulated gate bipolar transistor (IGBT) inverter arc welding machine |
| CN101579776B (en) * | 2009-03-04 | 2011-07-06 | 深圳市佳士科技股份有限公司 | Portable type IGBT invert arc welding machine |
| CN102717170A (en) * | 2012-06-01 | 2012-10-10 | 江门市保值久机电有限公司 | Hand arc welding device and welding method applying pulse current |
| CN104143919A (en) * | 2013-05-07 | 2014-11-12 | 台达电子工业股份有限公司 | Bidirectional direct-current converter |
| CN110350899A (en) * | 2019-08-09 | 2019-10-18 | 广东福田电器有限公司 | Noncontacting switch |
-
2009
- 2009-03-04 CN CN200920006701U patent/CN201371304Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101579776B (en) * | 2009-03-04 | 2011-07-06 | 深圳市佳士科技股份有限公司 | Portable type IGBT invert arc welding machine |
| CN102039474A (en) * | 2010-12-07 | 2011-05-04 | 上海瑞凌电器有限公司 | Single-tube insulated gate bipolar transistor (IGBT) inverter arc welding machine |
| CN102717170A (en) * | 2012-06-01 | 2012-10-10 | 江门市保值久机电有限公司 | Hand arc welding device and welding method applying pulse current |
| CN104143919A (en) * | 2013-05-07 | 2014-11-12 | 台达电子工业股份有限公司 | Bidirectional direct-current converter |
| CN110350899A (en) * | 2019-08-09 | 2019-10-18 | 广东福田电器有限公司 | Noncontacting switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 518000, Guangdong, Baoan District, Xixiang province Shenzhen Street Hengfeng Industrial City C2 Building 1, 2, 3, 4, West and 5, West and C4, building 5 Patentee after: Shenzhen Jasic Technology Co., Ltd. Address before: 518000 4F, C2, Hengfeng Industrial Town, crane state, Xixiang, Guangdong, Shenzhen, Baoan District Patentee before: Shenzhen Jasic Technology Development Co., Ltd. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20091230 Effective date of abandoning: 20090304 |