CN210997043U - Intelligent power supply of laser welding machine - Google Patents
Intelligent power supply of laser welding machine Download PDFInfo
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- CN210997043U CN210997043U CN201922053535.6U CN201922053535U CN210997043U CN 210997043 U CN210997043 U CN 210997043U CN 201922053535 U CN201922053535 U CN 201922053535U CN 210997043 U CN210997043 U CN 210997043U
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- resistor
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- switch tube
- power supply
- welding machine
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- 238000003466 welding Methods 0.000 title claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 54
- 229910052724 xenon Inorganic materials 0.000 claims description 15
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 15
- 238000004146 energy storage Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- Generation Of Surge Voltage And Current (AREA)
Abstract
The utility model provides a laser-beam welding machine intelligence power, including power conversion circuit, power conversion circuit includes switch tube S1, switch tube S2, electric capacity C1, electric capacity C2, electric capacity C3, the utility model discloses well power conversion circuit' S switch tube all turns off naturally when resonant current zero passage, and the condition that produces reverse peak voltage is turn-off to heavy current forces under the PWM control state can not appear to avoid causing the impact to the switch tube, and need not to add buffer circuit, simplified circuit structure.
Description
Technical Field
The utility model relates to a laser-beam welding machine technical field especially relates to a laser-beam welding machine intelligent power.
Background
The intelligent power supply of the laser welding machine generally comprises a rectification filter circuit, a switch conversion circuit, an energy storage discharge circuit, a pre-burning circuit, a control circuit and other protection circuits, wherein three-phase alternating current input is converted into direct current through rectification and filtering, is converted into a high-frequency alternating signal through switch conversion, and is subjected to high-frequency rectification to charge an energy storage capacitor. Before the load xenon lamp discharges, the xenon lamp is broken through and ionized by the high voltage generated by the trigger circuit of the pre-burning loop, and then the constant current circuit starts to work to provide stable pre-burning current for the xenon lamp, so that the xenon lamp is in a preparation state before discharging. The charged energy storage capacitor discharges to the xenon lamp load through the discharge switch and the inductor, thereby providing pumping working conditions of the laser.
At present, an IGBT is usually selected as a power switch in a switch conversion circuit, a duty ratio is controlled through PWM pulses, a switch tube is conducted under high voltage and is switched off under large current, the switch tube is in a forced switching process, and impact on the switch tube due to reverse peak voltage is easily generated. The common approach is to add a buffer circuit, but the circuit structure is further complicated.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a laser-beam welding machine intelligence power to switch tube IGBT that solves PWM control easily produces reverse peak voltage and causes the problem of impact to the switch tube when closing under the heavy current.
The technical scheme of the utility model is realized like this the utility model provides a laser-beam welding machine intelligence power, including power conversion circuit, power conversion circuit includes switch tube S1, switch tube S2, electric capacity C1, electric capacity C2, electric capacity C3, laser-beam welding machine intelligence power 'S low-voltage rectifier' S direct current side positive pole links to each other through electric capacity C1, electric capacity C2 'S projecting pole, switch tube S1' S collecting electrode, switch tube S2 'S collecting electrode, switch tube S2' S projecting pole rather than direct current side negative pole in proper order, and switch tube S1 'S collecting electrode links to each other through electric capacity C1, electric capacity C2 and switch tube S2' S projecting pole in proper order, and the public end of switch tube S1 projecting pole, switch tube S2 collecting electrode with the one end of laser-beam welding machine intelligence power 'S primary side L links to each other end, electric capacity C1, electric capacity C2' S public end through electric capacity C3 with the other end of step up transformer 361.
Optionally, the capacitance C1 is equal to the capacitance C2.
Optionally, the intelligent power supply of the laser welding machine further comprises a soft start circuit, the soft start circuit comprises a resistor R1 and a relay normally-open contact K1, the common end of the collector of the capacitor C1 and the switch tube S1 is connected with the positive pole of the direct current side of the low-voltage rectifier through the resistor R1, and the relay normally-open contact K1 is connected with the resistor R1 in parallel.
Optionally, the laser welding machine intelligent power supply further includes a pre-ignition trigger circuit, the pre-ignition trigger circuit includes a pulse transformer L2, a resistor R3, a resistor R4, a resistor R6, a capacitor C4, a capacitor C5, and a relay normally-open contact K2, a dc bus positive electrode of the high-voltage dc power supply of the laser welding machine intelligent power supply is sequentially connected to a dc bus negative electrode thereof through the resistor R3 and the resistor R4, the dc bus positive electrode is further sequentially connected to the dc bus negative electrode through the resistor R6 and the capacitor C5, the dc bus positive electrode is further sequentially connected to the dc bus negative electrode through a primary side of the pulse transformer L2 and a pulse xenon lamp of the laser welding machine intelligent power supply, a common end of the resistor R3 and the resistor R4 is sequentially connected to the dc bus negative electrode through a secondary side of the pulse transformer L2 and the relay normally-open contact K2, and the capacitor C4 is connected to the resistor R4 in parallel.
Optionally, the pre-burning trigger circuit further includes a resistor R5, and the resistor R5 is connected in series to the positive electrode of the dc bus.
Optionally, the pre-burning trigger circuit further includes a diode D1, the positive electrode of the dc bus is connected to the positive electrode of the dc side of the high-voltage rectifier of the intelligent power supply of the laser welding machine through the negative electrode of the diode D1 and the positive electrode of the diode D1, and the negative electrode of the dc bus is connected to the negative electrode of the dc side of the high-voltage rectifier.
Optionally, the pre-burning trigger circuit further includes a resistor R7 and a resistor R8, the positive electrode of the dc side of the high-voltage rectifier is connected to the negative electrode of the dc side thereof through the resistor R7, and the negative electrode of the diode D1 is connected to the negative electrode of the dc side of the high-voltage rectifier through the resistor R8.
The utility model discloses a laser-beam welding machine intelligent power has following beneficial effect for prior art:
(1) the utility model discloses a switching tube of the power conversion circuit of laser welding machine intelligent power all turn-offs naturally when resonance current zero crossing, the condition that heavy current forces to turn-off and produce reverse peak voltage under the PWM control state can not appear to avoid causing the impact to the switching tube, and need not to add buffer circuit, simplified circuit structure;
(2) the utility model discloses a laser-beam welding machine intelligence power precombustion trigger circuit has realized the afterflow of precombustion return circuit, and the monitoring return circuit that ignites in the cooperation power can realize the auto-ignition to the xenon lamp, improvement that can be very big ignition success rate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of the intelligent power supply of the laser welding machine of the present invention;
fig. 2 is a circuit diagram of a power conversion circuit according to the present invention;
fig. 3 is a circuit diagram of the pre-combustion trigger circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, with reference to fig. 2, the intelligent power source of the laser welding machine of the present invention includes a power conversion circuit, the power conversion circuit includes a switch tube S1, a switch tube S2, a capacitor C1, a capacitor C2, and a capacitor C3, the positive electrode of the dc side of the low-voltage rectifier of the intelligent power source of the laser welding machine is connected to the negative electrode of the dc side thereof via the collector of the switch tube S1, the emitter of the switch tube S1, the collector of the switch tube S2, and the emitter of the switch tube S2 in turn, the collector of the switch tube S1 is connected to the emitter of the switch tube S2 via the capacitor C1 and the capacitor C2 in turn, the common terminal of the emitter of the switch tube S1 and the collector of the switch tube S2 is connected to the primary terminal of the boost transformer L of the intelligent power source of the laser welding machine, and the common terminal of the capacitor C1 and the capacitor C2 is connected to the other.
As shown in fig. 1, the intelligent power supply of the laser welding machine generally further includes a step-up transformer, a high-voltage rectifier, a high-voltage dc power supply, a pre-burning trigger circuit, etc., the low-voltage rectifier is used for receiving three-phase ac power (e.g., 380V) and converting the ac power into dc power (e.g., 520V), the power conversion circuit has a function of inverting the dc power output by the low-voltage rectifier into ac power and performing power change, the step-up transformer is used for boosting the inverted ac power (e.g., 1000V), and the high-voltage rectifier is used for converting the high-voltage ac power output by the step-up. The high-voltage direct current power supply is used for outputting high-voltage direct current (such as 1800V) to the pre-burning trigger circuit, the pre-burning trigger circuit continuously boosts the high-voltage direct current (such as 20000V), pre-burning trigger is carried out on a laser xenon lamp in the laser welding machine, inert gas in the laser xenon lamp is rapidly broken down, then an energy storage capacitor in the high-voltage rectifier is controlled to start discharging to the laser xenon lamp, ignition is successful, and the laser works normally.
In this embodiment, as shown in fig. 2, the switching tube S1 and the switching tube S2 are both IGBT tubes, the switching tube S1, the switching tube S2, the capacitor C1, the capacitor C2, the capacitor C3, and the primary side of the boost transformer L1 jointly form a resonant circuit, the switching tube S1 and the switching tube S2 are both turned off in an initial state, when a trigger pulse is applied to the gate of the switching tube S1, the capacitor C1 discharges through the switching tube S1 and the primary side of the boost transformer L1 and the capacitor C3, and the capacitor C2 charges through the dc output of the low-voltage rectifier, the switching tube S1 and the capacitor C3, when the switching tube S2 is turned on, the capacitor C2 discharges and the capacitor C1 charges, and in the above process, the switching tube S1 and the switching tube S2 are both turned off when the resonant current passes zero, the resonant circuit is not naturally turned off, and a large-current surge buffer circuit is not needed to be naturally turned off, and a PWM circuit is not needed to be naturally buffered.
Optionally, the capacitance C1 is equal to the capacitance C2.
The capacitance of the capacitor C1 is equal to that of the capacitor C2, the circuit is symmetrical, in an initial state, the voltage at the midpoint of the switch tube S1 and the switch tube S2 is half (for example VCC/2) of the output voltage of the low-voltage rectifier, when the switch tube S1 is conducted, the voltage at the midpoint of the switch tube S1 and the switch tube S2 rises to (VCC/2+ delta), when the switch tube S2 is conducted, the voltage at the midpoint of the switch tube S1 and the switch tube S2 drops to (VCC/2-delta), namely, the voltage at the midpoint of the switch tube S1 and the switch tube S2 changes within the range of +/-delta, and the half-bridge circuit has the capability of resisting unbalance, so when the delta changes within a small range, the magnetic biasing phenomenon of the booster transformer L1 cannot be caused.
Optionally, as shown in fig. 1 and fig. 2, the intelligent power supply of the laser welding machine further includes a soft start circuit, the soft start circuit includes a resistor R1 and a relay normally-open contact K1, a common terminal of a capacitor C1 and a collector of a switching tube S1 is connected to the positive electrode of the dc side of the low-voltage rectifier through a resistor R1, and a relay normally-open contact K1 is connected in parallel to the resistor R1.
When the power supply is started, the normally open contact K1 of the relay is in a disconnected state, the resistor R1 is connected in series with the main circuit, the charging current during starting can be limited, the input current of the power supply is not larger than the load current, then the normally open contact K1 of the relay is controlled to be attracted, and the resistor R1 is short-circuited, so that the soft start of the power conversion circuit is realized, and the impact on a power grid cannot be caused.
Optionally, as shown in fig. 1 and fig. 3, the intelligent power supply of the laser welding machine further includes a pre-ignition trigger circuit, the pre-ignition trigger circuit includes a pulse transformer L, a resistor R3, a resistor R4, a resistor R6, a capacitor C4, a capacitor C5, and a relay normally-open contact K2, a dc bus positive electrode of the high-voltage dc power supply of the intelligent power supply of the laser welding machine is sequentially connected to a dc bus negative electrode thereof through a resistor R3 and a resistor R4, the dc bus positive electrode is further sequentially connected to the dc bus negative electrode through a resistor R6 and a capacitor C5, the dc bus positive electrode is further sequentially connected to the dc bus negative electrode through a primary side of a pulse transformer L and a pulse xenon lamp of the intelligent power supply of the laser welding machine, a common end of the resistor R3 and a resistor R4 is sequentially connected to the dc bus negative electrode through a secondary side of a pulse transformer L and a relay normally-open contact K2, and the capacitor C4 is connected in parallel to the resistor R596.
In this embodiment, in an initial state, a high-voltage direct current output by the high-voltage direct current power supply is divided by the resistors R3 and R4, the capacitor C4 is charged by the resistor R3, the capacitor C5 is charged by the resistor R6, the normally-open contact K2 of the relay is disconnected, the high voltage on the capacitor C4 cannot supply power to the pulse transformer L2 due to the blocking of the normally-open contact K2 of the relay, the capacitor C5 loads a high-voltage initial voltage to the pulse xenon lamp by the resistor R6 to reduce the impact of a high-voltage pulse, after the capacitors C4 and C5 are fully charged, the normally-open contact K2 of the relay is controlled to be closed, the energy stored in the capacitor C4 discharges the primary side of the pulse transformer L2, the primary side of the pulse transformer L2 generates a discharge pulse, meanwhile, the secondary side of the pulse transformer L2 induces a high-voltage pulse and loads the pulse to the pulse xenon lamp, and the high-voltage pulse rapidly breaks down the inert gas in the pulse lamp, the capacitors C4 and C5 can play a role in maintaining current until.
Therefore, the pre-burning trigger circuit in the embodiment realizes follow current of the pre-burning circuit, can realize automatic ignition of the xenon lamp by matching with the ignition monitoring circuit in the power supply, and can greatly improve the ignition success rate.
Optionally, as shown in fig. 3, the pre-burning trigger circuit further includes a resistor R5, and the resistor R5 is connected in series to the positive electrode of the dc bus. The resistor R5 is used for limiting overcurrent in high-voltage direct current and plays a role of protecting a circuit.
Optionally, as shown in fig. 3, the pre-burning trigger circuit further includes a diode D1, the positive electrode of the dc bus is connected to the positive electrode of the dc side of the high-voltage rectifier of the smart power supply of the laser welding machine through the negative electrode of the diode D1 and the positive electrode of the diode D1, and the negative electrode of the dc bus is connected to the negative electrode of the dc side of the high-voltage rectifier.
In a typical laser welding machine intelligent power supply, a direct current bus of a pre-burning trigger circuit and a direct current bus of a high-voltage rectifier are connected, but two circuits need to be isolated, and a diode D1 can play an electrical isolation role.
Optionally, as shown in fig. 3, the pre-burning trigger circuit further includes a resistor R7 and a resistor R8, the positive electrode of the dc side of the high-voltage rectifier is connected to the negative electrode of the dc side thereof through a resistor R7, and the negative electrode of the diode D1 is connected to the negative electrode of the dc side of the high-voltage rectifier through a resistor R8.
In this embodiment, when the capacitor C4 discharges, a weak dc current may appear in the pre-burning trigger circuit, and at this time, the energy stored in the energy storage capacitor in the low-voltage rectifier may be compensated to the main loop where the low-voltage rectifier is located through the resistor R7 and the resistor R8 in a balanced manner, and meanwhile, the pre-burning main loop is filter-shaped, so that the dc component in the main loop can be further improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A laser welding machine intelligent power supply comprises a power conversion circuit and is characterized in that the power conversion circuit comprises a switch tube S1, a switch tube S2, a capacitor C1, a capacitor C2 and a capacitor C3, wherein the positive pole of the direct current side of a low-voltage rectifier of the laser welding machine intelligent power supply is sequentially connected with the negative pole of the direct current side of the low-voltage rectifier through the collector of a switch tube S1, the emitter of a switch tube S1, the collector of a switch tube S2 and the emitter of a switch tube S2, the collector of a switch tube S1 is sequentially connected with the emitter of a switch tube S2 through a capacitor C1 and a capacitor C2, the common ends of the emitter of a switch tube S1 and the collector of a switch tube S2 are connected with one end of the primary side of a boosting transformer L1 of the laser welding machine intelligent power supply, and the common ends of a capacitor C1 and a capacitor C2 are connected with the other end of the primary side of the.
2. The smart power supply of claim 1 wherein the capacitance of capacitor C1 is equal to the capacitance of capacitor C2.
3. The intelligent power supply of the laser welding machine as claimed in claim 1, further comprising a soft start circuit, wherein the soft start circuit comprises a resistor R1 and a relay normally-open contact K1, a common end of a capacitor C1 and a collector electrode of a switch tube S1 is connected with a direct current side positive electrode of the low-voltage rectifier through a resistor R1, and a relay normally-open contact K1 is connected with a resistor R1 in parallel.
4. The intelligent power supply of the laser welding machine according to claim 1, further comprising a pre-ignition trigger circuit, wherein the pre-ignition trigger circuit comprises a pulse transformer L, a resistor R3, a resistor R4, a resistor R6, a capacitor C4, a capacitor C5 and a relay normally-open contact K2, a direct current bus positive electrode of a high voltage direct current power supply of the intelligent power supply of the laser welding machine is connected with a direct current bus negative electrode thereof through a resistor R3 and a resistor R4 in sequence, the direct current bus positive electrode is connected with the direct current bus negative electrode through a resistor R6 and a capacitor C5 in sequence, the direct current bus positive electrode is connected with the direct current bus negative electrode through a primary side of a pulse transformer L and a pulse xenon lamp of the intelligent power supply of the laser welding machine in sequence, a common end of the resistor R3 and a resistor R4 is connected with the direct current bus negative electrode through a secondary side of a pulse transformer L and a relay normally-open contact K2 in sequence, and the capacitor C4 is connected with a resistor R4.
5. The intelligent power supply of the laser welding machine as claimed in claim 4, wherein the pre-burning trigger circuit further comprises a resistor R5, and the resistor R5 is connected in series with the positive electrode of the DC bus.
6. The intelligent power supply of the laser welding machine as claimed in claim 4, wherein the pre-burning trigger circuit further comprises a diode D1, the positive pole of the DC bus is connected with the positive pole of the DC side of the high-voltage rectifier of the intelligent power supply of the laser welding machine through the negative pole of a diode D1 and the positive pole of a diode D1, and the negative pole of the DC bus is connected with the negative pole of the DC side of the high-voltage rectifier.
7. The intelligent power supply of the laser welding machine as claimed in claim 6, wherein the pre-burning trigger circuit further comprises a resistor R7 and a resistor R8, the positive pole of the DC side of the high-voltage rectifier is connected with the negative pole of the DC side of the high-voltage rectifier through a resistor R7, and the negative pole of the diode D1 is connected with the negative pole of the DC side of the high-voltage rectifier through a resistor R8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922053535.6U CN210997043U (en) | 2019-11-25 | 2019-11-25 | Intelligent power supply of laser welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922053535.6U CN210997043U (en) | 2019-11-25 | 2019-11-25 | Intelligent power supply of laser welding machine |
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| Publication Number | Publication Date |
|---|---|
| CN210997043U true CN210997043U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922053535.6U Expired - Fee Related CN210997043U (en) | 2019-11-25 | 2019-11-25 | Intelligent power supply of laser welding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036765A (en) * | 2021-03-30 | 2021-06-25 | 国网河北省电力有限公司雄安新区供电公司 | Direct-current magnetic bias suppression device, method and control system |
-
2019
- 2019-11-25 CN CN201922053535.6U patent/CN210997043U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036765A (en) * | 2021-03-30 | 2021-06-25 | 国网河北省电力有限公司雄安新区供电公司 | Direct-current magnetic bias suppression device, method and control system |
| CN113036765B (en) * | 2021-03-30 | 2023-06-30 | 国网河北省电力有限公司雄安新区供电公司 | DC magnetic bias suppression device, method and control system |
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Granted publication date: 20200714 |