CN202963742U - Inversion arc welding machine adopting single-tube insulated gate bipolar transistor (IGBT) single board - Google Patents

Abstract

The utility model relates to an inversion arc welding machine adopting a single-tube insulated gate bipolar transistor (IGBT) single board. The inversion arc welding machine adopting the single-tube IGBT single board is composed of an inversion main circuit composed of a single-tube IGBT and a control circuit composed of a single-tube IGBT. Whole circuits are arranged on a circuit board. Only a relay, a rectifier, a filtering electrolytic capacitor, an IGBT, a heat dissipater of the IGBT, an inversion main transformer, a fast recovery diode outputting rectification, a heat dissipater of the fast recovery diode, a cooling electric fan, a current detection mutual inductor and a pulse drive transformer are manually assembled and welded, and a plurality of other electronic devices are automatically installed and welded on the circuit board through surface mount technology (SMT) patches. Because a plurality of surface patch electronic devices and an SMT surface mount technique are adopted to automatically process the circuit board, a welding machine is high in production efficiency and low in manufacturing cost. In the aspect of circuit board structural design, the welding machine has characterized layout and innovative design.

Description

A kind of inverter arc welding machine that adopts single tube IGBT veneer

Technical field

The utility model relates to a kind of electronically controlled welding equipment, specifically a kind of inverter arc welding machine that adopts single tube IGBT veneer.

Background technology

IGBT is a kind of power switch electronic device, the encapsulation of IGBT (or contour structures) form is many, can see the explanation of some correlation technique data for details, say roughly, mainly contain the forms such as modular IGBT and single tube IGBT, the former volume is large, and electric current and electric pressure are high, price is mainly used in the manufacturing of industrial large-current electric device product; The latter volume is little, and electric current and electric pressure are low, and price is low, is mainly used in the manufacturing of small-power and low current level electric equipment products, as small-sized and family expenses inverter type welder etc.

Current, the competition of electric welding machine market product is very fierce, not only be embodied on the advance and advantage of technology, also depend on to a great extent what, the aspects such as the uniformity of product and reliability of height, the production cost of level, the production efficiency of manufacturing process.

At present, the inverse transformation electric arc welder of the following current class of 160A, it is many adopting the inverter main circuit of single tube IGBT composition and the inverter type welder kind of control circuit formation, their circuit and version are also diversified.different circuit and structural design thinking thereof, the physical circuit form that adopts and the mode of whole circuit arrangement are also different, moreover, the performance indications of welding machine comprise current/voltage scope and the corresponding cyclic duration factor thereof of output, the class of insulation, temperature rise, the functional reliability of welding machine, manufacturing costs etc. also may show some gaps, even under identical product performance index, difference due to physical circuit and structural design aspect thereof, the packing forms of the electronic devices and components that perhaps adopt is different, thereby the assembling of components and parts, welding and characterization processes level, automaticities etc. also have obvious difference, this will make the size of inverter type welder electron product circuit plate, the convenience that during production, device is installed, production efficiency, production cost, the cost of final products etc. also has significant difference, for example, if adopt a large amount of SMT surface-mounted device or integrated circuit, because the volume of device is little, thereby can make the size reduction of circuit board, reduce the cost of PCB material, in addition, due to these surface-mounted devices of welding equipment usually adopt the advanced person, efficient, be suitable for the equipment of automated production in enormous quantities and detection, thereby can greatly improve the production efficiency of circuit board or product, reduce production costs, increase the competitiveness of product in market.

The utility model content

The purpose of this utility model is to provide a kind of inverter arc welding machine that adopts single tube IGBT veneer, remove the other power consumption of tool and the larger components and parts of volume and need hand assembled and welding, other a large amount of electronic devices and components all adopt the SMT surface-mounted device to carry out Auto-mounting and welding, adopt advanced automatic placement machine to process, not only production efficiency is high, and error rate is low, quality is good, cost of manufacture is low, therefore, the production of circuit board and install very convenient, fast, qualification rate and the production efficiency of product are high, finally make the production cost of product low, the market competitiveness is strong.

For achieving the above object by the following technical solutions:

a kind of inverter arc welding machine that adopts single tube IGBT veneer, it is characterized in that: adopt inverter main circuit and the control circuit that single tube IGBT forms to consist of, whole circuit part is arranged on a circuit board, only has relay, rectifier, electrolytic capacitor filter, IGBT and radiator thereof, the inversion main transformer, fast recovery diode and the radiator thereof of output rectification, the cooling electric fan, the current detecting transformer, pulsed drive transformer adopting hand assembled and welding, other a large amount of electronic devices and components all adopt the SMT surface-mounted device carry out Auto-mounting and be welded on circuit board.

The utility model has not only adopted advanced reverse control technology, but also adopted technology and the techniques such as a large amount of SMT paster production, detection, thereby have the advantages such as simple in structure, that volume is little, lightweight, cost is low, production efficiency is high, manufacturing technology is advanced; On circuit board, can be by changing the current class of IGBT pipe, and the current class of adjusting the output fast recovery diode, and in conjunction with the parameter value of a small amount of electric capacity, resistance on the modification circuits plate, can change the size of output current or the power of welding machine, easily form the product of the many specifications of seriation that meet country and international standard, have good production flexibility.

Description of drawings

Fig. 1 is the structural representation of the utility model welding machine

Fig. 2 is the circuit board element schematic layout pattern of the utility model welding machine

Part inventory in Fig. 1: 1, self-tapping screw; 2, handle; 3, power line; 4, switch; 5, plastics rear board; 6, casing; 7, plastics front panel; 8, electric current regulator potentiometer and knob; 9, LED light; 10, snap joint; 11, electrolytic capacitor filter; 12, electrochemical capacitor; 13, relay; 14, thermistor; 15, resistance; 16, electrochemical capacitor; 17, IGBT; 18, IGBT radiator; 19, IGBT drives platelet; 20, driving transformer; 21, IGBT radiator; 22, IGBT; 23, current detecting transformer; 24, dc fan; 25, rectifier bridge radiator; 26, switching mode power supply transformer; 27, rectifier; 28, temperature relay; 29, inversion main transformer; 30, circuit board; 31, chassis backplane.

The specific embodiment

as shown in Fig. 1-2, a kind of inverter arc welding machine that adopts single tube IGBT veneer, adopt inverter main circuit and the control circuit that single tube IGBT forms to consist of, whole circuit part is arranged on a circuit board, only has relay 13, rectifier 27, electrolytic capacitor filter 11, IGBT22 and radiator 18 thereof, 21, inversion main transformer 30, fast recovery diode and the radiator thereof of output rectification, the cooling electric fan, the current detecting transformer, pulsed drive transformer adopting hand assembled and welding, other a large amount of electronic devices and components all adopt the SMT surface-mounted device carry out Auto-mounting and be welded on circuit board.

Rectifier 27 and radiator 25 thereof, electrolytic capacitor filter DJDR1～DJDR3, IGBT1～IGBT4 and radiator 17,18,21,22 thereof, fast recovery diode KH1～KH4, contravariant transformer NBZB, protection resistance-capacitance circuit etc. form inverter main circuit; the secondary commutation of inverter main circuit is completed by fast recovery diode KH1～KH4; OUTPUT(+) and OUTPUT(-) be the output of circuit board, be connected respectively to the positive and negative snap joint terminal of output of welding machine.

Switching mode power supply transformer KGDB in accompanying drawing 2 and the accessory circuits such as three terminal integrated voltage stabilizer on every side thereof consist of direct current regulation circuit, can obtain stable 24V and the direct-current working volts of 15V, and these voltage supply control circuits can work these circuit.

in accompanying drawing 1 and accompanying drawing 2, resistance R T, relay J DQ and control circuit thereof form the buffer circuit that powers on, can make the time that welding machine electric power switch 4 closes that lags behind actuation time of relay J DQ, thereby reach the purpose of the devices such as surge current impact failure power switch that prevent from closing a floodgate, when connecting power supply, in a period of time due to power switch after closing, + 24V voltage does not also produce, therefore, can lag behind the actuation time of power switch the actuation time of relay J DQ, during this period of time, the contact of relay J DQ does not also have closure, electric current can only be by resistance R T to rectifier power supply, and then charge for electrolytic capacitor filter DJDR1～DJDR3, when DJDR1～DJDR3 charging reaches stable, relay J DQ just can move, the normally opened contact of JDQ is closed, thereby short circuit resistance R T, if there is no RT, JDQ and control circuit thereof, switch on power after switch, because the voltage on electrochemical capacitor DJDR1～DJDR3 is zero, be equivalent to the output of rectifier 27 in short-circuit condition, therefore, can produce very large electric current at the input of PD1, even can burn out rectifier 27, as seen, the time-delay of resistance R T is by short circuit, can play and reduce the effect that starting current powers in other words and cushions, and then protection rectifier PD1, switch is unlikely by excessive electric current and burns out, certainly, if enter normal inversion output, and relay J DQ is not moved, resistance R T can burn out because flowing through larger electric current, this is the fault that as far as possible be avoided.

under the effect of welding machine output characteristics control circuit part, can obtain pulse width modulation (PWM) signal about tens KHz, by this signal and Drive and Control Circuit part, obtain to change according to certain rules the control signal that can drive IGBT1～IGBT4 pipe group alternate conduction, the alternate conduction of IGBT1～IGBT4 pipe group, can produce high-frequency alternating electric current and voltage in the armature winding of inversion main transformer NBZB, hypotensive effect by inversion main transformer NBZB, obtain certain high-frequency ac voltage and electric current, rectified action through fast recovery diode KH1～KH4, thereby obtain to satisfy DC voltage and the electric current of welding requirements, that is to say, under the effect of control circuit, the output characteristics of welding machine is the decline external characteristics, can obtain to satisfy the requirement of shielded metal arc welding process.

in accompanying drawing 1 23 is current detecting transformer CT, can detect the primary current of inversion main transformer, the size of this electric current is directly proportional to the welding current of this welding machine output, output current is large, current signal to be detected also larger for CT, this current detection signal is as the Current Negative Three-Point Capacitance signal, be input to corresponding control circuit part, and compare with given value of current signal that potentiometer Ug produces, can obtain to drive by control circuit the pulse width modulating signal that IGBT1～IGBT4 plumber does, the frequency of this signal is fixed, can reach about tens KHz, but, the width of pulse is to change, its Changing Pattern is: during welding, when the given value of current signal of potentiometer Ug generation increases, the welding current of output also can increase thereupon, otherwise, can reduce, when the given value of current signal that produces as potentiometer Ug is constant, increase along with welding current, the Current Negative Three-Point Capacitance signal increases, because its polarity is opposite with the polarity of given signal, therefore, the pulse width that drives IGBT1～IGBT4 plumber work is reduced, so the pulse width of the IGBT that produces also reduces thereupon, the ON time of IGBT shortens, this will make the lower voltage of output, namely in the situation that given constant, welding current increases, output voltage reduces, this has namely obtained the so-called decline external characteristics that satisfies the manual electric arc welding requirement.

In accompanying drawing 2, the drive circuit of IGBT is mainly by device or the electric circuit constitutes such as driving transformer QDB, the little circuit boards of driving, the output of drive circuit is connected respectively to power switch IGBT1～IGBT4 pipe, and purpose is under the effect of control signal, promotes the work of IGBT1～IGBT4; Principle is: under the control of pulse width modulation chip U4 output signal, driving transformer QDB can be in the alternation state of on-off, the frequency of its work is determined by the output signal of pulse width modulation chip U4, simultaneously, under the effect of driving transformer QDB and the little circuit board of driving, can obtain the driving pulse voltage signal of power switch IGBT1～IGBT4 pipe, under this control voltage effect, IGBT1～IGBT4 pipe can be realized the alternation state of on-off according to the requirement of controlling, finally complete the requirements such as control of welding machine output characteristics.

referring to accompanying drawing 1 and accompanying drawing 2, welding machine output characteristics control circuit mainly is comprised of components and parts such as the resistance of a lot of SMT paster techniques around adjustable potentiometer Ug, pulse-width modulator U4, integrated circuit U1～U3, trimmer potentiometer WT1 and WT2 and their, electric capacity, triodes, the Main Function of these circuit is: the output characteristics of 1) controlling electric welding machine, when the given value of current signal of potentiometer Ug generation increased, the welding current of output also can increase thereupon, otherwise, can reduce, when the given value of current signal that produces as potentiometer Ug is constant, increase along with welding current, the Current Negative Three-Point Capacitance signal that in accompanying drawing 1 23 detects for current detecting transformer CT increases, because its polarity is opposite with the polarity of given signal, therefore, control by circuit, the pulse width that drives IGBT1～IGBT4 plumber work is reduced, so the pulse width that the IGBT that drive circuit produces drives also reduces thereupon, the ON time of IGBT shortens, this will make the lower voltage of output, by above-mentioned control action, can make the output characteristics of the source of welding current satisfy the requirement of technology of arc welding, 2) by regulating trimmer potentiometer WT1 and WT2, specified minimum and the maximum current of the output of recoverable welding machine, when the radiator that 3) fast recovery diode KH1～KH4 detected when the temperature relay 28 in accompanying drawing 1 is in superheat state, these temperature relay 28 actions, control by related circuit, can make welding be in the overtemperature protection state, stop exporting large electric current, prevent from burning out IGBT1～IGBT4 pipe and fast recovery diode KH1～KH4 pipe, 4) in welding output current process, when the output voltage that welding machine detected during lower than 16V, by the effect of control circuit, the pulse width of IGBT is increased along with the reduction of voltage, thereby realize along with the welding machine output voltage reduces and the phenomenon of output current increase.Here it is realizes so-called " push current " control, satisfies the requirement of shielded metal arc welding process.

The circuit that the utility model is good and structural design thereof are advantage of the present utility model places, are also the important leverages that satisfies efficient and low-cost production, high reliability, manufacturing technology advance.

Claims (1)

1. inverter arc welding machine that adopts single tube IGBT veneer, it is characterized in that: adopt inverter main circuit and the control circuit that single tube IGBT forms to consist of, whole circuit part is arranged on a circuit board, only has relay, rectifier, electrolytic capacitor filter, IGBT and radiator thereof, the inversion main transformer, fast recovery diode and the radiator thereof of output rectification, the cooling electric fan, the current detecting transformer, pulsed drive transformer adopting hand assembled and welding, other a large amount of electronic devices and components all adopt the SMT surface-mounted device carry out Auto-mounting and be welded on circuit board.

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