CN2030523U - Dc welder with silicon controlled inverter for mines - Google Patents
Dc welder with silicon controlled inverter for mines Download PDFInfo
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- CN2030523U CN2030523U CN 87206157 CN87206157U CN2030523U CN 2030523 U CN2030523 U CN 2030523U CN 87206157 CN87206157 CN 87206157 CN 87206157 U CN87206157 U CN 87206157U CN 2030523 U CN2030523 U CN 2030523U
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Abstract
The utility model discloses a DC welder with silicon controlled inverter for mines which comprises an inversion main loop, a trigger control circuit, the circuit of a 50HZ inverter and a start-up circuit. The direct current power supply is used to supply the electricity by the utility model, and the utility model is fit for an underground transportation system with big change of the supply voltage. The utility model has the advantages of small size, light weight, small empty loss, high efficiency and good reliability. The utility model has the capacity of compensation and fluctuation of the power source, and the utility model can be normally operated under the electric voltage of 180-320V and 450-700V. The utility model is a product which replaces the older product is used by the users in more than ten cities all over the country.
Description
The utility model belongs to a kind of mining DC power supply thyristor inversion electric welding machine.（HO2M）
The arc welder that utilizes the thyristor inversion fabrication techniques is the new product of just succeeding in developing in recent years, and it is little that it has a volume, the efficient height, and power output is stable, saves advantages such as rare metal, so some like products are all arranged both at home and abroad.
The common feature of these inverter arc welding machines all is to adopt a phase or a three-phase alternating-current supply supply power mode, and they only are applicable to that ground has the place of AC power.
Domestic and international AC power inverter arc welding machine functional-block diagram (see figure 1)
Powcon thyristor inversion A.C. welder schematic diagram (see figure 2) as U.S. cyclomatic industrial group.
Its AC power that is input as three-phase 380V, rectification through Z1-Z6, R1, L1, C1, C2 filtering become direct current, become high-frequency current for controllable silicon series resonant inverter loop SCR3, SCR4, provide the direct current source of welding current through transformer B1, D3, D4 rectifier diode.The square frame II is that trigger control circuit plate (this circuit is unexposed) a, b, c, d, each monitoring point of e, f provide different signals to guarantee the welding machine steady operation among Fig. 1.H, I, J, K are the triggering silicon controlled signal of control board output, and the required low-voltage dc power supply of control board is inserted by A, O, uses for the circuits for triggering plate behind lowering and stabilizing blood pressure.
The inversion major loop of Powcon welding machine is the serial connection controllable silicon inverter circuit that adopts the PFM pulse frequency modulated, and controllable silicon utilizes current over-zero to turn-off naturally in the RLC loop.This welding machine reverse high voltage that transformer produces when being limited in Light Condition and current interruption state prevents overcharging of capacitor C3-C6 and damages, so designed the instantaneous voltage absorption circuit of being made up of D1, D2, SCR1, SCR2, DW1, DW2, R5-R9.This circuit is installed complicated, and cost is higher.
The Powcon welding machine works in the more stable three-phase alternating-current supply of voltage, and Z1-Z6 becomes direct current with alternating current with three-phase rectifier, and for inverter circuit work, its power supply is reliable and stable.Welding machine of the present utility model works in DC power supply, does not need rectifying device, but the DC power supply of its work is that the haulage drift locomotive uses DC power supply under the coal mine, and scope range of the fluctuation of voltage is very big.(450-700
), or (180-320
) electric locomotive starts and can produce bigger spark during walking and disturb, so the Powcon welding machine can not adapt to this condition of work.
The purpose of this utility model is that a kind of direct-current electric locomotive stringing of down-hole nude that can utilize of design is welding machine electric power, can work under the very big condition of voltage fluctuation, and volume is little, and is in light weight, the mining DC power supply thyristor inversion electric welding machine that efficient is high.
The block diagram of the utility model welding machine is seen Fig. 3.
Welding machine of the present utility model is a DC power supply, and is applicable to the down-hole transportation system that mains voltage variations is very big.
The inversion major loop of this welding machine adopts the serial connection controllable silicon inverter circuit of PFM pulse frequency modulated, owing to improved reverse frequency, makes its volume-diminished, weight saving.Controllable silicon utilizes current over-zero to turn-off naturally in the RLC loop, and it absorbs protective circuit and adopts 2 TVP1, TVP2 transient voltage suppressing diodes to finish.Thereby simplified circuit, reduced cost, improved reliability.
The operation principle (see figure 4) of this welding machine.
Dc power anode enters the LC filter circuit of L1 and ZC1 composition again through BX, ZD1, R1.
Form semibridge system series resonant inverter circuit by SCR3, SCR4, B1, R12, C7, R13, C8, RY1, RY2, L2A, L2B, ZC2, ZC3, ZD2, ZD3, TVP1, TVP2, R7.Its inversion process is: connect DC power supply, when the two-way that the circuits for triggering II produces is exported ALT pulse signal (waveform of its circuits for triggering plate is seen Fig. 6) when making the SCR3 conducting, the discharging current of ZC2 is by ZC2 upper end → L2A → SCR3 → B1 → ZC2 lower end, the charging current of ZC3 is by power supply "+" → L2A → SCR3 → B1 → ZC3 → power supply "-", thereby B1 level of main transformer just induces positive half cycle voltage.When the ZC3 charging current was kept electric current less than silicon controlled, SCR3 turn-offed voluntarily.When the pulse of circuits for triggering makes the SCR4 conducting, the discharging current of ZC3 is by upper end → B1 → SCR4 → L2B → ZC3 lower end of ZC3, the charging current of ZC2 is by power supply "+" → ZC2 → B1 → SCR4 → L2B → power supply "-", thus the secondary negative half period voltage that induces again of main transformer B1.When the electric current SCR4 that keeps of the little SCR4 of ZC2 charging current turn-offs voluntarily.SCR3, SCR4 whenever alternately turn on and off once like this, on B1 secondary, just induce the alternating voltage of a cycle, and the number of times that turn on and off each second is many more, reverse frequency is just high more, height at this welding machine reverse frequency is directly proportional with the output welding current, the external characteristic of this welding machine in addition, Current Regulation also obtains by changing frequency.
Avoid commutation failure (being that the conducting simultaneously of two controllable silicons of unlikely generation causes the power supply short circuit phenomenon) in circuit in order to guarantee the reliability that two controllable silicons of SCR3 SCR4 replace the change of current, take out cut-off signals from SCR3 SCR4 anode by R10, R11, enter M, the N end of circuits for triggering II, make it any controllable silicon by being conducting to when turn-offing, produce the necessary condition of a control signal as the another silicon controlled trigger signal.In other words: SCR3 does not turn-off, and the SCR4 control signal does not add or SCR4 does not turn-off the SCR3 control signal and do not add, thereby has guaranteed the stability and the reliability of welding machine work.
The rectification output and the filter circuit of this welding machine are made up of D3, D4, L3, L4, ZC7, E, F that the voltage drop that the shunt FL of commutating circuit series connection produces enters the circuits for triggering II hold the pulse frequency that changes circuits for triggering as feedback signal with the external characteristic of realization welding machine and the function of automatic stabilisation welding current, and the P end of introducing the circuits for triggering II from the positive pole of output can guarantee certain unloaded output voltage to control this welding machine in the scope range of the fluctuation of voltage that adapts in addition.
Potentiometer ZW1 three ends that this welding machine adopts one grade of Current Regulation to use are connected on respectively among Q, R in the circuits for triggering II, the S, change the resistance of ZW1, can change the output of electric current.
This welding machine has following difference with U.S.'s Powcon welding machine:
1, this welding machine electric power input is direct current supply, and the Powcon welding machine is an Alternating Current Power Supply.
2, this welding machine has the 50HZ inverter, and the Powcon welding machine does not have.
3, this welding machine voltage absorpting circuit is TVP control, and the Powcon welding machine is SCR control.
4, the anode of this welding machine rectification output diode connects the elementary of transformer, and the diode anode of Powcon welding machine connects the secondary of transformer.
5, this welding machine adopts one grade of Current Regulation, need not change the capacity of commutation capacitance and rectification output filter capacitor in the circuit, and the Powcon welding machine adopts second gear coarse adjustment Current Regulation, so need to change the capacity of commutation electric capacity and rectification output filter capacitor.
The working dc power of this welding machine is the DC power supply that colliery haulage drift locomotive uses, electric locomotive all starts during the class of producing coal, direct voltage descends significantly, voltage raises again significantly during maintenance crew, producing bigger spark when adding electric locomotive startup and walking disturbs, be more higher harmonic voltage, damage controllable silicon probably by the instantaneous overvoltage of short duration that above-mentioned reason produces.For adapting to the bigger direct voltage of this fluctuation range, each piezo-resistance RY1, a RY2 in parallel on the two ends of the controllable silicon SCR 1 of inversion major loop, SCR2 are to absorb overvoltage, the protection controllable silicon.
Cause self-contained circuit to damage the power supply reversal connection when preventing to use, ad hoc diode D1 is not even the power supply reversal connection damages welding machine yet.
Cooling blower during the work of this welding machine needs the 50HZ alternating voltage; integrated circuit on the trigger control circuit also needs stable ± 15V power supply becomes the device (see figure 5) of 50HZ alternating current so designed a cover with dc inversion, and overcurrent has been installed; overvoltage, the excess temperature automatic protection circuit.Guarantee work reliable and stable under mal-condition.
The major technique condition of this welding machine is:
1, DC power supply voltage: I type 250V, scope range of the fluctuation of voltage 180-320V
II type 550V, scope range of the fluctuation of voltage 450-700V
2, power supply input power: 10KW
3, rated operational current: 250A
4, rated duty cycle: 60%
5, unloaded output voltage: 75V
6, rated operational voltage 30V
7, efficient: 80%
8, weight: 35kg
9, volume: 490 * 260 * 440mm
Description of drawings:
Fig. 1 is a Powcon thyristor inversion A.C. welder block diagram.
Fig. 2 is a Powcon thyristor inversion A.C. welder schematic diagram.
Wherein: II-trigger control circuit.
Fig. 3 is mining DC power supply thyristor inversion electric welding machine block diagram.
Fig. 4 is mining DC power supply thyristor inversion electric welding machine schematic diagram.
Wherein: I-50HZ inverter power circuit
II-trigger control circuit
The TVP-transition suppresses diode
RY1, RY2-piezo-resistance
RT1, RT2-thermistor
The FJ-cooling blower
Fig. 5 is a 50HZ inverter power circuit schematic diagram.
Wherein: II-trigger control circuit
The IC-integrated circuit
The GD-photoelectrical coupler
The FJ-cooling blower
The AN1-start button
Fig. 6 is the mode chart of circuits for triggering plate.
5 represented embodiment are described in detail the utility model below in conjunction with accompanying drawing:
IC is a turnable pulse width switch integrated circuit piece (Cw3524) in the 50HZ inverter power circuit, has 16 pin.The two-way square-wave pulse that 11 pin are opposite with 14 pin output phases, this signal inserts the base stage of exciting electrode BG1, BG2 respectively, then after BG1, BG2 power amplification, promotes the inverter output circuit be made up of BG3-6 through NB1 again.Because the base stage input pulse voltage-phase of BG3, BG6 and BG4, BG5 is opposite, and be that the diagonal angle is opened and the diagonal angle turn-offs during four pipe works, thereby the emitter of BG3, the interface of the collector electrode of BG4 and the emitter of BG5, the collector electrode interface of BG6 just produces square wave, promptly produces alternating voltage.This voltage is for the cooling blower and the work of trigger control circuit plate of welding machine.
In order to improve the reliability of welding machine, prolong its time between failures, take following measure:
1, circuit is adjusted in design, guarantees inversion plate inversion major loop steady operation.
In inverter circuit, in order to guarantee the operate as normal of BG3-6 inverter output circuit, when BG3, BG6 turn-off and when BG4, BG5 conducting, one spacer segment time (being Dead Time) must be arranged, the phenomenon that can avoid the pipe generation direct-current short circuit of conducting like this and cause two pipes to puncture simultaneously, the length of this blanking time can be adjusted NR2, NR3 and obtain.
The height of whole reverse frequency depends on NC4, NR4, and its numerical value is big more, and frequency is low more, and vice versa, and this reverse frequency is 50HZ ± 1 week.
2, photoelectric isolating circuit:
The 10th pin of IC integrated circuit is the closing control end.When the voltage that adds this end during greater than certain numerical value, IC output quits work.In order to guarantee the integrated package operate as normal, the photoelectricity that utilizes the GD photoelectrical coupler transmits signal and the characteristics of electrode isolation are kept apart the high-pressure section of inversion circuit and the low-pressure section of IC, has improved reliability.
3, current foldback circuit:
When the output of triode inversion circuit overload or short circuit, monitored the voltage drop that leakage resistance NR14 produces, when making it voltage and be higher than NDW2 voltage stabilizing value through ND6; the work of GD photoelectrical coupler; cause the IC no-output, the BG3-6 inverter quits work, and has played protective effect.11st, 14 pin no-output immediately, the BG3-6 triode also stops inversion because of losing base drive voltage.Because of the existence of this overcurrent feedback procedure, avoided the damage of BG3-6 triode.
4, overvoltage crowbar:
Because of this welding machine power supply voltage pole instability, the controllable silicon and the blower fan of the electric welding machine of overtension, thereby damage sometimes inversion major loop take place for fear of this phenomenon, have added resistance NR11, AW1 and ND5 in circuit.Adjustment NR11 can make 27% o'clock of dc voltage fluctuation rising rated value, the ND5 conducting, and the work of GD photoelectrical coupler causes the IC no-output, and inverter quits work, thereby has played protective effect.
5, thermal-shutdown circuit:
For fear of when using welding machine, the welder exceeds the quata the welding of fixed load water holdup or cutting and causes that transformer or rectification output diode are overheated and damage, and is provided with the protective circuit that RT1, RT2, ND2, ND3, NR5 form in the circuit.Be contained in as RT1(on the radiator of rectification output diode) and RT2(be contained in the middle of two line bags of main transformer), when temperature surpasses the ceiling temperature value, the resistance of RT1, RT2 changes ic chip the 4th pin over-current detection terminal potential is changed, thereby forces IC to quit work.
6, anti-jamming circuit:
Electric welding machine is when work, disturb producing powerful electric spark, particularly the 50HZ inverter influence that integrated circuit is formed is bigger, has designed the coil NL1 by the pot core coiling for this reason, and it has effectively eliminated the failure of oscillation phenomenon of disturbing and eliminated this welding machine inverter when striking.
7, start-up circuit:
Manual actuation of button AN1.When DC power supply inserted, welding machine was not worked, and promptly the 50HZ inverter is not worked.This moment, power supply was given electric capacity NC1 charging by normally closed contact and the resistance NR1 of AN1.During start, press AN1, NC1, NR1 and isolated from power, NC1 passes through NR1, the normal opened contact of AN1 is powered to IC, for preventing that transient high voltage from causing that in to circuit discharging circuit damages, positive and negative direct-flow input end at IC inserts voltage-stabiliser tube NDW1, starting resistor is limited in 15V, inverter work this moment, the inverting output terminal output AC voltage, cooling blower and trigger control circuit are worked immediately, and trigger control circuit just produces the direct voltage of 15V simultaneously, this voltage fed back in the inverter power circuit by NL1 go, go down for the work of IC long-term safety.
The utility model has the advantages that: volume is little, and is in light weight, waste little, the efficient height, the carrying conveniently moving, not road occupying does not affect underground transportation. And has a power-supply fluctuation compensation ability. When the welding striking, have the anti-function of being stained with of welding rod, be stained with such as the contingency welding rod, within a second, welding machine automatically reduces electric current and avoids overload. When changing welding arc length, also can guarantee to supply with stable power. This welding machine can be at 180-320V, works under the 450-700V voltage, and floating voltage is substantially surely at 75V. Because controllable silicon parameters selection surplus is big, the trigger control circuit plate adopts integrated circuit, so that whole aircraft reliability improves greatly.
Claims (4)
1, a kind of mining DC power supply thyristor inversion electric welding machine, it adopts the controllable silicon series resonant inverter circuit of PFM pulse frequency modulated is that major loop and trigger control circuit are formed, it is characterized in that 50HZ inverter circuit I and start-up circuit are inserted in the welding machine circuit, make it to produce the 50HZ AC power, the air feed machine, the work of circuits for triggering II, IC in the 50HZ inverter power circuit is a turnable pulse width switch integrated circuit piece, its output signal is through triode BG1, BG2, and transformer NB1 promotes the bridge inverter main circuit that BG3-6 forms; In the 50HZ circuit, insert NR2, NR3, so that arranged when BG3, BG6 shutoff and BG4, BG5 conducting a blanking time; Utilize photoelectrical coupler, the high-pressure section of inversion major loop and the low-pressure section of IC are kept apart; When circuit output end overload or short circuit, insert and monitored leakage resistance NR14, ND6, NDW2,, cause IC to quit work by GD photoelectrical coupler NR10, ND4; When supply voltage surpasses the voltage that welding machine adapted to, insert R11, NW1, ND5, NDW2 in the circuit, the work of GD photoelectrical coupler causes the IC no-output, and inversion quits work; Designed coil NL1 in the circuit, eliminated the interference of welding machine inverter circuit when work by the pot core coiling.
2, electric welding machine as claimed in claim 1 is characterized in that inserting NR4, NC4 in the 50HZ inverter power circuit, determines the 50HZ reverse frequency.
3, electric welding machine as claimed in claim 1 is characterized in that external thermistor RT1, RT2, forms thermal-shutdown circuit by the ND2 in the inverter, ND3, NR5, NR9.
4, electric welding machine as claimed in claim 1 is characterized in that the positive and negative direct-flow input end of IC integrated circuit block inserts voltage-stabiliser tube NDW1, and starting resistor is limited in 15V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87206157 CN2030523U (en) | 1987-04-10 | 1987-04-10 | Dc welder with silicon controlled inverter for mines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87206157 CN2030523U (en) | 1987-04-10 | 1987-04-10 | Dc welder with silicon controlled inverter for mines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2030523U true CN2030523U (en) | 1989-01-11 |
Family
ID=4821784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87206157 Withdrawn CN2030523U (en) | 1987-04-10 | 1987-04-10 | Dc welder with silicon controlled inverter for mines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2030523U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873074A (en) * | 2010-05-14 | 2010-10-27 | 保定中恒电气有限公司 | Three-phase miniature high frequency switching power supply |
| CN102484390A (en) * | 2009-09-07 | 2012-05-30 | 法雷奥电机设备公司 | Alternator having synchronous rectification for a motor vehicle, provided with electronic defect management means |
| CN112386330A (en) * | 2021-01-19 | 2021-02-23 | 安隽医疗科技(南京)有限公司 | 500A radio frequency ablation instrument host system |
| CN113936881A (en) * | 2021-10-11 | 2022-01-14 | 阜阳师范大学 | Magnetic field control system for micro-structure and multiferroic sequence parameter information |
-
1987
- 1987-04-10 CN CN 87206157 patent/CN2030523U/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102484390A (en) * | 2009-09-07 | 2012-05-30 | 法雷奥电机设备公司 | Alternator having synchronous rectification for a motor vehicle, provided with electronic defect management means |
| CN102484390B (en) * | 2009-09-07 | 2015-05-20 | 法雷奥电机设备公司 | Alternator having synchronous rectification for a motor vehicle, provided with electronic defect management means |
| CN101873074A (en) * | 2010-05-14 | 2010-10-27 | 保定中恒电气有限公司 | Three-phase miniature high frequency switching power supply |
| CN112386330A (en) * | 2021-01-19 | 2021-02-23 | 安隽医疗科技(南京)有限公司 | 500A radio frequency ablation instrument host system |
| CN113936881A (en) * | 2021-10-11 | 2022-01-14 | 阜阳师范大学 | Magnetic field control system for micro-structure and multiferroic sequence parameter information |
| CN113936881B (en) * | 2021-10-11 | 2024-03-01 | 阜阳师范大学 | Magnetic field control system for microstructure and multiferroic order parameter information |
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| PB01 | Publication | ||
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |