CN2753498Y

CN2753498Y - Laser welding machine

Info

Publication number: CN2753498Y
Application number: CN 200420105331
Authority: CN
Inventors: 王忠坡
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2004-11-22
Filing date: 2004-11-22
Publication date: 2006-01-25
Anticipated expiration: 2014-11-22

Abstract

The utility model discloses a laser welding machine, which comprises a power supply system and a control system, wherein the output end of the power supply system is connected with the input end of a power supply of the control system; the power supply system only one power supply circuit; the control system comprises two control circuits; the input ends of the power supplies of the two control circuits are connected with the output end of the power supply circuit in parallel; the output ends of the two control circuits are used for respectively controlling two pulse xenon lamps. The utility model is only provided with one power supply circuit which simultaneously supplies power supplies to the two control circuits, saving one power supply, and thus the utility model saves manufacturing cost, and reduces the volume of the laser welding machine. The two control circuits respectively control that the two pulse xenon lamps send outs laser to carry out weld, increasing weld speed. Meanwhile, the utility model can reliably protect IGBT modules.

Description

Laser-beam welding machine

[technical field]

The utility model relates to a kind of laser-beam welding machine, relates in particular to the laser-beam welding machine with dipulse xenon lamp, is applied to the welding of battery.

[background technology]

When making battery, need operation through the battery welding, used bonding machine is a laser-beam welding machine.Laser welder is made up of power-supply system, control system, light path system, stepper drive system and hydrologic cycle cooling system four big frames, and four interdependences are indispensable.

Cooling recirculation system is made of recirculated cooling water, deionized water, magnetic drive pump, filter, water tank, heat exchanger etc., for welding machine provides cooling, with the operation that guarantees that machine can be long-time, stable.

Power-supply system is made of intelligent thyristor module, energy capacitance set, electric semiconductor, saturable reactor etc., by rectification, filtering, voltage stabilizing etc. for other each system of welding machine provides accurately, the reliable energy.

Control system is mainly by constituting as the IGBT module of pulse switch, IGBT overcurrent protection module, loop overcurrent protection module etc.; controlling two IGBT moves simultaneously; with required frequency of acquisition work and pulsewidth, paired

pulses xenon lamp

1 and 2 carries out pre-burning respectively, and keeps the low current conducting.

The light path Adjustment System is graded and is constituted by solid state laser, laser pump cavity, He-Ne Lasers lamp, resonant element, focus portion, for welding machine provides high-quality laser, finishes the welding of cell shapes.

The stepper drive system is made of Programmable Logic Controller (PLC), driver, stepper motor, workbench, for production work provides essential platform.

But existing laser-beam welding machine has following shortcoming: 1) existing laser-beam welding machine is because need two pulse xenon lamps of control, so have two to overlap independently rectification, filtering, voltage-stabilized power supply and the independent control circuit of two covers, control the pre-burning and the work of two xenon lamps respectively.The cost of manufacture of bonding machine is improved, and volume is big, and it is big to take up room.If change single xenon lamp into, though overcome the problem of cost of manufacture and volume, the speed of welding battery descends.2) protect the IGBT module though used the special purpose driver M57962L of IGBT module, protect not thorough.Special purpose driver M57962L inside has short-circuit protection function, and circuit diagram can be with reference to figure 4.When IGBT module overload (overvoltage, overcurrent), that is its collector voltage is when rising to greater than 15V, isolating diode D1 ends, detection input 1. pin is the 15V high level, when testing circuit detects when detecting input 1. pin being the 15V high level, be judged to be short circuit, driver with the control signal output 5. pin put low level, IGBT is ended.Though prior art can make IGBT end, when interference made the control signal output 5. pin is not interposing at low level, the IGBT conducting during greater than 15V, made the IGBT module breakdown at collector voltage.

[summary of the invention]

Main purpose of the present utility model is exactly the contradictory problems for the cost that solves laser-beam welding machine of the prior art, volume and speed of welding, a kind of laser-beam welding machine is provided, can reduce laser-beam welding machine manufacturing cost, reduce its volume, therefore its speed of welding can not descended.

Secondary objective of the present utility model is exactly in order to solve the halfway problem of IGBT module protection of the prior art, and a kind of laser-beam welding machine is provided, and can reliably end when making IGBT module overload (overvoltage, overcurrent), prevents that the IGBT module is breakdown.

For achieving the above object, a kind of laser-beam welding machine that the utility model proposes, comprise power-supply system and control system, the output of described power-supply system is connected with the power input of control system, described power-supply system only comprises No. one power circuit, described control system comprises the two-way control circuit, and the power input of this two-way control circuit is connected in parallel on the output of described No. one power circuit, and the output of described two-way control circuit is used for controlling respectively two xenon flash lamps.

Of the present utility modelly further be improved as: described control system comprises IGBT module and the IGBT protection module that is used for as pulse switch; described IGBT protection module comprises the special purpose driver M57962L that is used to protect the IGBT module; the detection of described driver M57962L input is rectified and is connect the colelctor electrode that is connected to IGBT behind first diode; the control signal output is coupled to the base stage of IGBT; be used for output low level signal when the detection input is high level; IGBT is ended; described IGBT protection module also comprises photo-coupler and latching circuit; described photo-coupler links to each other with the failure output terminal of driver M57962L; be used for when the detection input is high level; the failure output terminal output low level makes photo-coupler work; described latching circuit is connected between the control signal input of the output of photo-coupler and driver M57962L; be used for the control signal input of driver M57962L is put high level and remained on high level state, thereby make the control signal output of driver M57962L maintain low level.

The beneficial effects of the utility model are: 1) have only No. one power circuit, for the two-way control circuit provides power supply, saved one road power supply simultaneously, thereby saved manufacturing cost, also reduced the volume of laser-beam welding machine.The two-way control circuit is controlled two xenon flash lamps respectively and is sent laser and weld, and is one times that single lamp goes out light frequency because two lamps go out light frequency, so the speed of welding battery is compared also and can be doubled with the individual pulse xenon lamp.2) by the control signal input of driver M57962L is put high level and remained on high level state, thereby make the control signal output of driver M57962L maintain low level, IGBT is reliably ended.

Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.

[description of drawings]

Fig. 1 is the main circuit schematic diagram;

Fig. 2 is the laser-beam welding machine workflow diagram;

Fig. 3 is a driver M57962L workflow diagram;

Fig. 4 is the IGBT module among a kind of embodiment and the circuit connection diagram of IGBT protection module;

Fig. 5 is the circuit diagram of the major loop current foldback circuit among a kind of embodiment.

[specific embodiment]

Specific embodiment one, as shown in Figure 1, main circuit comprises power-supply system 11, control system 12, xenon flash lamp 1 and xenon flash lamp 2.Power-supply system 11 only comprises No. one power circuit, mainly by intelligent object, charging resistor R3, the single-phase reactor 111 of order series connection, form as the capacitance group 112 of accumulator, be parallel with discharge resistance 113 at the two ends of energy capacitance set 112, described capacitance group 112 is composed in parallel by two or more capacitance group, and described each capacitance group is made up of two or more capacitances in series.Control system 12 comprises the two-way control circuit; the input of two-way control circuit is parallel to the output plus terminal of capacitance group 112; every road control circuit mainly comprises the IGBT module; the IGBT protection module; high-voltage diode; pre-burning contactor and major loop overcurrent protection module; the colelctor electrode of IGBT module links to each other with the output plus terminal of capacitance group 112; emitter-coupled is to the anode of high-voltage diode; the negative electrode of high-voltage diode is coupled to the pre-burning contactor; the IGBT protection module is sampled to the collector voltage of IGBT module, and the major loop overcurrent protection module is sampled to the cathode current of high-voltage diode.Xenon flash lamp 1 and xenon flash lamp 2 are connected between the output negative terminal of the output of two pre-burning contactors and capacitance group 112.Its workflow is as shown in Figure 2:

Start: open main power source;

Water pump leaves: start cooling recirculation system;

Current-limiting charge: capacitance group 112 is charged by current-limiting resistance R3, big electric current is to the impact of capacitance group when reducing to charge, capacitance group adopts a plurality of than low capacity, low withstand voltage high-quality electric capacity series and parallel composition, compare with the electric capacity of single high power capacity, high withstand voltage, not only can improve the capability value and the withstand voltage of whole capacitor group, reach the capacity identical and withstand voltage, and can reduce the destructive power of electric capacity when overcharging with it;

Pre-burning: carry out pre-burning respectively by pre-burning system paired pulses xenon lamp 1 and xenon flash lamp 2, and keep the low current conducting;

Discharge: after charging finished, short circuit current-limiting resistance R3 was for operate as normal is got ready;

Control circuit:, control two IGBT and move simultaneously, with required frequency of acquisition work and pulsewidth by phase-shift control circuit;

Work: by operating key, the bright dipping of control impuls xenon lamp makes transistor work, finishes the welding of cell shapes by the stepper drive system.

Aspect the IGBT protection module; preferred version as shown in Figure 4; utilize the special purpose driver M57962L protection IGBT of IGBT module; driver M57962L inside has short-circuit protection function; its detect input 1. pin just connecing the colelctor electrode that is connected to IGBT behind the first diode D1, the collector voltage of sampled I GBT module.Control signal output 5. pin is coupled to the base stage of IGBT module, is used for output low level signal when detecting input and be high level, and IGBT is ended.Failure output terminal 8. pin links to each other with the input of photo-coupler OPT, and latching circuit is connected between control signal input 13 pin of the output of photo-coupler and driver M57962L.Its holding circuit workflow diagram as shown in Figure 3.When (the overvoltage of IGBT module overload, overcurrent) time, that is its collector voltage is when rising to greater than 15V, the first diode D1 that plays buffer action ends, detection input 1. pin is the 15V high level, when testing circuit detects and detects input 1. pin is the 15V high level, be judged to be short circuit, enabling gate breaking circuit immediately, with the control signal output 5. pin put low level, simultaneously output error signal make failure output terminal 8. pin be low level, make photo-coupler OPT work, to drive latching circuit work, the energising self-locking, control signal input 13 pin are put high level and remained on high level state, like this control signal output 5. pin just maintain low level, promptly the negative 9V voltage that is input as of IGBT reliably ends IGBT, avoids the IBGT module breakdown when overvoltage or overcurrent.After 1～2ms time-delay, be high level if detect the input pin, then driver M57962L is reset to original state.Latching circuit comprises the triode Q1 of order series connection, relay, the first reverser IC1:A and the second reverser IC1:B form, photo-coupler OPT connects the base stage of triode Q1, drive triode Q1 conducting, the emitter stage of triode Q1 drives relay, relay power, its normally opened contact is closed 1 of the first reverser IC1:A, 2 pin are clamped at high level, the output of the first reverser IC1:A connects input 5 pin of the second reverser IC1:B, and 4 pin of the second reverser IC1:B also export control signal input 13 pin of driver M57962L to for high level.The pulse input end 6 pin conductively-closeds of the second reverser IC1:B.

Specific embodiment two, as shown in Figure 4; comparing different with specific embodiment one is that the IGBT protection module also comprises first voltage-stabiliser tube that the IGBT module is further protected; the negative electrode of first voltage-stabiliser tube is connected with the anode of the first diode D1, and anode is connected with the negative pole of power supply VEE.In the present embodiment, first voltage-stabiliser tube is the first Zener diode Z1, is used to prevent that D1 from puncturing and damage driver M57962L.

Specific embodiment three, as shown in Figure 4; comparing different with specific embodiment one, two is that the IGBT protection module also comprises second voltage-stabiliser tube and the 3rd voltage-stabiliser tube that negative electrode that the IGBT module is further protected connects; the anode of second voltage-stabiliser tube is connected with the base stage of IGBT, and the anode of described the 3rd voltage-stabiliser tube is connected with the emitter stage of IGBT.In the present embodiment, second voltage-stabiliser tube is the second Zener diode Z2, and the 3rd voltage-stabiliser tube is the 3rd Zener diode Z3, forms limiter, and is not breakdown to guarantee the IGBT base stage.Current-limiting resistance Rext is connected the base stage of IGBT and control signal output 5. between the pin.

Specific embodiment four; on the basis of the foregoing description, also comprise the major loop overcurrent protection module; as shown in Figure 5; the major loop overcurrent protection module comprises the Hall current sensor that is used to detect main circuit current; first amplifying circuit 121; second amplifying circuit 122; comparison circuit 123 and relay circuit 124; the input of described first amplifying circuit 121 and second amplifying circuit 122 is parallel to the output 125 of Hall current sensor; the output of first amplifying circuit 121 is used to export to Current Display; the output of second amplifying circuit 122 is coupled to the input of comparison circuit 123; the output of comparison circuit 123 is coupled to the input of relay circuit 124, and the output of relay circuit 124 is used to output control signals to peripheral control circuit.On the one hand by the external impressed current display gauge head can be on panel the direct electric current situation of change of load as can be seen; the voltage that Hall current sensor is induced is by i.e. second amplifying circuit 122 and voltage comparator 123 outputs of voltage amplifier on the other hand; when electric current drives the relay adhesive greater than when setting value, control peripheral circuit action protection loop overcurrent.

Claims

1. laser-beam welding machine, comprise power-supply system and control system, the output of described power-supply system is connected with the power input of control system, it is characterized in that: described power-supply system only comprises No. one power circuit, described control system comprises the two-way control circuit, the power input of this two-way control circuit is connected in parallel on the output of described No. one power circuit, and the output of described two-way control circuit is used for controlling respectively two xenon flash lamps.

2. laser-beam welding machine as claimed in claim 1 is characterized in that: described power-supply system comprises accumulator, and described accumulator is composed in parallel by two or more capacitance group.

3. laser-beam welding machine as claimed in claim 2 is characterized in that: described each capacitance group is made up of two or more capacitances in series.

4. as each described laser-beam welding machine in the claim 1 to 3; it is characterized in that: described control system comprises IGBT module and the IGBT protection module that is used for as pulse switch; described IGBT protection module comprises the special purpose driver M57962L that is used to protect the IGBT module; the detection of described driver M57962L input is rectified and is connect the colelctor electrode that is connected to IGBT behind first diode; the control signal output is coupled to the base stage of IGBT; be used for output low level signal when the detection input is high level; IGBT is ended; described IGBT protection module also comprises photo-coupler and latching circuit; described photo-coupler links to each other with the failure output terminal of driver M57962L; be used for when the detection input is high level; the failure output terminal output low level makes photo-coupler work; described latching circuit is connected between the control signal input of the output of photo-coupler and driver M57962L; be used for the control signal input of driver M57962L is put high level and remained on high level state, thereby make the control signal output of driver M57962L maintain low level.

5. laser-beam welding machine as claimed in claim 4 is characterized in that: described IGBT protection module also comprises first voltage-stabiliser tube, and the negative electrode of described first voltage-stabiliser tube is connected with the anode of first diode, and anode is connected with power cathode.

6. laser-beam welding machine as claimed in claim 4; it is characterized in that: described IGBT protection module also comprises second voltage-stabiliser tube and the 3rd voltage-stabiliser tube that negative electrode connects; the anode of described second voltage-stabiliser tube is connected with the base stage of IGBT, and the anode of described the 3rd voltage-stabiliser tube is connected with the emitter stage of IGBT.

7. laser-beam welding machine as claimed in claim 5; it is characterized in that: described IGBT protection module also comprises second voltage-stabiliser tube and the 3rd voltage-stabiliser tube that negative electrode connects; the anode of described second voltage-stabiliser tube is connected with the base stage of IGBT, and the anode of described the 3rd voltage-stabiliser tube is connected with the emitter stage of IGBT.

8. as each described laser-beam welding machine in the claim 1 to 3; it is characterized in that: also comprise the major loop overcurrent protection module; described major loop overcurrent protection module comprises the Hall current sensor that is used to detect main circuit current; first amplifying circuit; second amplifying circuit; comparison circuit and relay circuit; the input of described first amplifying circuit and second amplifying circuit is parallel to the output of Hall current sensor; the output of first amplifying circuit is used to export to Current Display; the output of second amplifying circuit is coupled to the input of comparison circuit; the output of comparison circuit is coupled to the input of relay circuit, and the output of relay circuit is used to output control signals to peripheral control circuit.

9. laser-beam welding machine as claimed in claim 4; it is characterized in that: also comprise the major loop overcurrent protection module; described major loop overcurrent protection module comprises the Hall current sensor that is used to detect main circuit current; first amplifying circuit; second amplifying circuit; comparison circuit and relay circuit; the input of described first amplifying circuit and second amplifying circuit is parallel to the output of Hall current sensor; the output of first amplifying circuit is used to export to Current Display; the output of second amplifying circuit is coupled to the input of comparison circuit; the output of comparison circuit is coupled to the input of relay circuit, and the output of relay circuit is used to output control signals to peripheral control circuit.