CN212977094U - Variable-frequency power supply system for rail flash welding - Google Patents
Variable-frequency power supply system for rail flash welding Download PDFInfo
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- CN212977094U CN212977094U CN202021815648.1U CN202021815648U CN212977094U CN 212977094 U CN212977094 U CN 212977094U CN 202021815648 U CN202021815648 U CN 202021815648U CN 212977094 U CN212977094 U CN 212977094U
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Abstract
The utility model provides a track flash welding variable frequency power supply system, the system includes: the power supply input circuit is used for inputting alternating current output by the three-phase alternating current power supply into the track flash welding variable frequency power supply system through the power supply input circuit; the three-phase uncontrolled rectifier is used for rectifying alternating current output by the power input circuit into direct current, the capacitor filter is used for filtering the direct current, and the inverter is used for converting the filtered direct current into alternating current with different frequencies according to a trigger instruction; the transformer is used for reducing the alternating current output by the inverter into low-voltage alternating current required by steel rail flash welding; the isolation inversion trigger circuit is used for controlling the inverter to output alternating current with corresponding frequency according to the control signal output by the data communication circuit; the data communication circuit is used for converting the received frequency parameters into corresponding control commands; the problems of low power utilization rate and discontinuous flash current of a flash welding power supply system adopting two-phase input in the prior art are solved.
Description
Technical Field
The utility model relates to a flash welding power technical field especially relates to a track flash welding variable frequency power supply system.
Background
Flash welding, also called contact welding, is the contact of the sections of two metal workpieces, the contact points of the sections conduct electricity, the end parts of the workpieces are heated by resistance heat generated by contact resistance, when the temperature reaches a certain degree, the metal of the contact surfaces of the workpieces is melted to form a liquid metal layer, the liquid metal is extruded by external longitudinal force, the high-temperature metal generates plastic deformation, common crystal grains are generated on the joint surfaces, and compact hot forging tissues are obtained to form butt joints; in practical applications, the continuity of the current during the flash is a necessary condition to obtain a quality joint for flash butt welding.
The traditional flash welding power supply adopts two-phase input, the output voltage is adjusted by changing the conduction angle of a silicon controlled rectifier, the discontinuity of flash current is obvious, the heating effect of a welding area in the flash process is poor, and the welding quality is directly influenced; the adoption of two-phase input can also cause the defects that the current of two phases in a three-phase power supply is large, the current of one phase is zero, the unbalanced work of the three-phase power supply is formed, the utilization rate of the power supply is low and the like; under the condition that a user needs certain power supply power, larger power supply power needs to be configured, the input of the power supply is greatly increased, and a large amount of energy is wasted.
Therefore, in the prior art, the flash welding power supply system adopting two-phase input has the defects of low power utilization rate, energy waste and discontinuous flash current, so that the heating effect of a welding area in the flash process is deteriorated, and the welding quality is directly influenced.
SUMMERY OF THE UTILITY MODEL
To the not enough that exists among the prior art, the utility model provides a pair of track flash welding variable frequency power supply system, it has solved the flash welding electrical power generating system power utilization rate low and the discontinuous problem of flash of light electric current that adopts double-phase input among the prior art.
The utility model provides a track flash welding variable frequency power supply system, the system includes: the device comprises a power supply input circuit, a frequency conversion circuit, a load circuit, a control circuit and a data communication circuit; the input end of the power input circuit is connected with a three-phase alternating current power supply when in use and is used for inputting alternating current output by the three-phase alternating current power supply into the track flash welding variable frequency power supply system through the power input circuit; the frequency conversion circuit comprises a three-phase uncontrolled rectifier, a capacitive filter and an inverter, wherein the input end of the three-phase uncontrolled rectifier is connected with the output end of the power input circuit and used for rectifying alternating current output by the power input circuit into direct current, the input end of the capacitive filter is connected with the output end of the three-phase uncontrolled rectifier and used for filtering the direct current, and the input end of the inverter is connected with the output end of the capacitive filter and used for converting the filtered direct current into alternating current with different frequencies according to a trigger instruction; the load circuit comprises a transformer, wherein the primary side of the transformer is connected with the output end of the inverter and is used for reducing the alternating current output by the inverter into low-voltage alternating current required by steel rail flash welding; the control circuit comprises an isolation inversion trigger circuit, the input end of the isolation inversion trigger circuit is connected with the output end of the data communication circuit and is used for outputting a corresponding trigger signal to the inverter according to a control signal output by the data communication circuit so that the inverter outputs alternating current with corresponding frequency; the data communication circuit is used for converting the received frequency parameters into corresponding control commands.
The technical principle of the utility model is as follows:
the utility model discloses a power input circuit inputs three-phase alternating current to three-phase uncontrolled rectifier rectification and is the direct current, becomes the little stable direct current of ripple coefficient through the electric capacity filter filtering, and stable direct current becomes the alternating current of different frequencies through the dc-to-ac converter, steps down to the required low pressure alternating current of rail flash welding through the transformer among the load circuit; the data communication circuit is used for converting frequency parameters input by a user into corresponding control commands and sending the control commands to the isolation inversion trigger circuit in the control circuit, so that the isolation inversion trigger circuit controls the inverter to output alternating current with corresponding frequency.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model provides a rail flash welding variable frequency power supply system adopts behind the three-phase alternating current input to be the direct current through three-phase full wave uncontrollable rectification, and the three-phase power consumption is balanced, and power factor is high, and power utilization is very high, and during the same rail of welding, system's distribution total power has been reduced.
2. The utility model provides a rail flash welding variable frequency power supply system adopts power frequency variable frequency control technique to realize the meticulous regulation of flash welding electric current, and the size regulation of flash current is realized through adjusting the amplitude of sinusoidal wave, and no matter in heavy current or undercurrent, the welding current of flash heating rail is continuous complete sinusoidal wave all the time; the discontinuity of flash current is eliminated, the heat concentration in the flash current heating process and the stability of welding quality are greatly improved, and a necessary hardware basis is provided for obtaining a high-quality and high-efficiency flash welding joint.
3. The method has the advantages that the balance work of three-phase electricity is realized on the steel rail mobile flash welding site, the working condition of the diesel power generation set is improved, the configuration power is greatly reduced, and the capital investment is greatly reduced; secondly, the diesel oil is fully combusted, the utilization rate is high, the emission of toxic gas is greatly reduced, and the working environment is improved.
4. The utility model provides a rail flash welding variable frequency power supply system adopts the transformer the same with ordinary power frequency flash welding, to reforming transform the upgrading into variable frequency welding machine with ordinary power frequency welding machine, need not change the transformer, reduces the fund input to reach saving, power saving, energy-conservation, the balanced purpose of three-phase power consumption.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a variable frequency power supply system for track flash welding according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating comparison between current and voltage regulation waveforms according to the prior art and the present embodiment of the present invention;
fig. 3 is a circuit diagram of an inverter trigger circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of another inverter trigger circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. The functional units of the same reference numerals in the examples of the present invention have the same and similar structures and functions.
Fig. 1 shows that the embodiment of the utility model provides a pair of track flash welding variable frequency power supply system's that provides structural schematic diagram, as shown in fig. 1, track flash welding variable frequency power supply system 100 that this embodiment provided specifically includes:
a power input circuit 110, a frequency conversion circuit 120, a load circuit 130, a control circuit 140 and a data communication circuit 150;
when the input end of the power input circuit 110 is used, the input end is connected with a three-phase alternating-current power supply, and is used for inputting alternating current output by the three-phase alternating-current power supply to the track flash welding variable-frequency power supply system 100 through the power input circuit 110;
the frequency conversion circuit 120 includes a three-phase uncontrolled rectifier, a capacitive filter and an inverter, wherein an input end of the three-phase uncontrolled rectifier is connected to an output end of the power input circuit and is configured to rectify the ac power output by the power input circuit into dc power, an input end of the capacitive filter is connected to an output end of the three-phase uncontrolled rectifier and is configured to filter the dc power, and an input end of the inverter is connected to an output end of the capacitive filter and is configured to convert the filtered dc power into ac power with different frequencies according to a trigger instruction;
the load circuit 130 comprises a transformer V, wherein the primary side of the transformer V is connected with the output end of the inverter and is used for reducing the alternating current output by the inverter into low-voltage alternating current required by steel rail flash welding;
the control circuit 140 includes an isolated inversion trigger circuit, an input end of the isolated inversion trigger circuit is connected to an output end of the data communication circuit 150, and is configured to output a corresponding trigger signal to the inverter according to the control signal output by the data communication circuit 150, so that the inverter outputs an ac power with a corresponding frequency;
the data communication circuit 150 is configured to convert the received frequency parameters into corresponding control commands.
It should be noted that the utility model discloses a power input circuit 110 inputs three-phase alternating current to three-phase uncontrolled rectifier rectification for the direct current, becomes the stable direct current that ripple coefficient is little through the electric capacity filter filtering, and stable direct current becomes the alternating current of different frequencies through the dc-to-ac converter, steps down to the low pressure alternating current that the rail flash welding needs through the transformer in load circuit 130; the data communication circuit 150 is configured to convert a frequency parameter input by a user into a corresponding control command, and send the control command to an isolation and inversion trigger circuit in the control circuit 140, so that the isolation and inversion trigger circuit controls the inverter to output an ac power with a corresponding frequency.
Fig. 2 is a schematic diagram illustrating comparison between current and voltage regulation waveforms according to the prior art and the present embodiment of the present invention; as shown in fig. 2, a diagram (a1) is a waveform diagram of an input power of a conventional flash power supply, a diagram (b1) is a waveform diagram of an output voltage of a conventional flash power supply, a diagram (c1) is a waveform diagram of an output current of a conventional flash power supply, a diagram (a2) is a three-phase ac input power of a variable-frequency flash power supply of the embodiment, a diagram (b2) is a waveform diagram of an output voltage of a variable-frequency flash power supply of the embodiment, and a diagram (c2) is a waveform diagram of an output current of a variable-; it can be seen from the figure that the frequency of the input power supply in the prior art is a fixed value, and the present embodiment can use three-phase alternating current with different frequencies as the input power supply, regardless of the frequency of the input power supply, and it is crucial that the output frequency of the input power supply is variable to adapt to transformer loads with different frequencies (for example, 50Hz in China and 60Hz in foreign countries). Compared with a common power frequency flash power supply and a medium-frequency direct-current flash power supply, the output of the power frequency flash power supply and the medium-frequency direct-current flash power supply is a complete sine wave, so that the working condition of the load of a transformer is improved, and the welding machine has less splashing; three-phase power utilization balance; the pollution to the power grid is small; the user can set the output frequency by himself, adapts to current transformer, and production facility changes for a short time, practices thrift the cost.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model provides a rail flash welding variable frequency power supply system adopts behind the three-phase alternating current input to be the direct current through three-phase full wave uncontrollable rectification, and the three-phase power consumption is balanced, and power factor is high, and power utilization is very high, and during the same rail of welding, system's distribution total power has been reduced.
2. The utility model provides a rail flash welding variable frequency power supply system adopts power frequency variable frequency control technique to realize the meticulous regulation of flash welding electric current, and the size regulation of flash current is realized through adjusting the amplitude of sinusoidal wave, and no matter in heavy current or undercurrent, the welding current of flash heating rail is continuous complete sinusoidal wave all the time; the discontinuity of flash current is eliminated, the heat concentration in the flash current heating process and the stability of welding quality are greatly improved, a necessary hardware basis is provided for obtaining a high-quality high-efficiency flash welding joint, and a waveform comparison diagram of output voltage and current of the traditional flash power supply and the variable-frequency flash power supply in the scheme in the figure 2 can be referred.
3. The method has the advantages that the balance work of three-phase electricity is realized on the steel rail mobile flash welding site, the working condition of the diesel power generation set is improved, the configuration power is greatly reduced, and the capital investment is greatly reduced; secondly, the diesel oil is fully combusted, the utilization rate is high, the emission of toxic gas is greatly reduced, and the working environment is improved.
4. The utility model provides a rail flash welding variable frequency power supply system adopts the transformer the same with ordinary power frequency flash welding, to reforming transform the upgrading into variable frequency welding machine with ordinary power frequency welding machine, need not change the transformer, reduces the fund input to reach saving, power saving, energy-conservation, the balanced purpose of three-phase power consumption.
In an embodiment of the present invention, the inverter includes: a first IGBT transistor Q1, a second IGBT transistor Q2, a third IGBT transistor Q3, and a fourth IGBT transistor Q4; the drain of the first IGBT Q1 and the drain of the second IGBT Q2 are connected to the positive output terminal of the capacitive filter, the source of the third IGBT Q3 and the source of the fourth IGBT Q4 are connected to the negative output terminal of the capacitive filter, the gate of the first IGBT Q1 and the gate of the fourth IGBT are connected to the first output terminal of the isolated inverter trigger circuit, and the gate of the second IGBT Q2 and the gate of the third IGBT Q3 are connected to the second output terminal of the isolated inverter trigger circuit; the source of the first IGBT Q1 is connected to the drain of the third IGBT Q3 to form a first output of the inverter, and the source of the second IGBT Q2 is connected to the drain of the fourth IGBT Q4 to form a second output of the inverter.
It should be noted that, the inverter of this embodiment adopts a full-bridge inverter circuit composed of four IGBT tubes, the four IGBT tubes are turned on in turn, the first IGBT tube Q1 and the fourth IGBT tube Q4 are turned on at the same time at time T1 to output a forward voltage, the second IGBT tube Q2 and the third IGBT tube Q3 are turned on at the same time at time T2 to output a reverse voltage, and such repetition forms an alternating current to output.
Fig. 3 is a circuit diagram of an inverter trigger circuit according to an embodiment of the present invention, as shown in fig. 3, the present embodiment converts a control signal into a pulse or a pulse group with a certain frequency, and uses the pulse to control on/off of power switching elements IGBT 1-IGBT 4 in the inverter circuit, so as to control the output voltage and frequency of the inverter circuit; the inverter frequency conversion controller is mainly applied to the inverter frequency conversion controller, and has the general functions of: generating output pulses with corresponding frequencies according to the requirements of the control signals; determining the phase relation among the driving signals of each power switch of the inverter; generating sufficient driving power to drive the power switching element; the electrical isolation between the power switching element and the control circuit is accomplished.
The operating principle of the inverter trigger circuit of the embodiment is as follows: the frequency generator converts the control signal into pulse voltage with corresponding frequency to trigger the pulse distributor, so that the pulse distributor distributes the switch signal to the pulse output devices of each channel according to a certain rule, the pulse output devices amplify the switch signal, and the power switch elements are driven after electric isolation, the large-scale integrated circuit HEF4752V which is specially used for generating sine pulse width modulation signals integrates the main functions of the sine pulse width modulation trigger (excluding the pulse output devices) on a silicon chip with 18 square millimeters and is packaged in a double-row 28-pin shell. The entire integrated circuit is fully digital.
In an embodiment of the present invention, the control circuit further includes: and the digital signal processor is connected with the isolation inversion trigger circuit, is also connected with the data communication circuit, and is used for receiving a control command or parameter setting from the data communication circuit and sending a corresponding voltage signal to the isolation inversion trigger circuit.
In another embodiment of the present invention, the control circuit further includes: the circuit comprises a leakage detection circuit, a tripping control circuit, a voltage detection circuit and a current detection circuit.
In another embodiment of the present invention, the data communication circuit includes: the microprocessor is connected with the digital signal processor and is used for exchanging data with the digital signal processor through the control command, the parameter setting and shared memory; the I/O interface circuit is connected with the microprocessor, is also connected with the PLC, the key switch and the status indicator lamp when in use, and is used for realizing local control and monitoring through the I/O interface circuit; and the communication bus is connected with the microprocessor, is also connected with the touch screen, the upper computer and the edge gateway when in use, and is used for realizing remote monitoring through the communication bus.
Fig. 4 is a circuit diagram of an inverter trigger circuit according to an embodiment of the present invention, as shown in fig. 4, the inverter trigger circuit provided in this embodiment includes:
a first resistor R1, wherein a first end of the first resistor R1 is connected with the gate of the IGBT tube;
the driving chip U1, the input of driving chip U1 with the output of data communication circuit links to each other, the first output of driving chip U1 with the second end of first resistance R1 links to each other, the first end of driving chip U1 with the source electrode of IGBT pipe links to each other, the second end of driving chip U1 links to each other with first power when using for according to the control signal of data communication circuit output, output corresponding voltage signal control the turn-off and switch-on of IGBT pipe.
In this embodiment, each of the inverter trigger circuits further includes: a second resistor R2, a third resistor R3, a diode D, a first voltage regulator tube Z1, a second voltage regulator tube Z2, a third voltage regulator tube Z3, a fourth voltage regulator tube Z4, a fifth voltage regulator tube Z5, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; wherein, a first end of the second resistor R2 is connected with the first power source VCC1, a second end of the second resistor R2 is connected with a cathode of the fourth regulator tube Z4, an anode of the fourth regulator tube Z4 is grounded, a first end of the first capacitor C1 is connected with a cathode of the fourth regulator tube Z4, a second end of the first capacitor C1 is connected with an anode of the fourth regulator tube Z4, a second end of the first capacitor C1 is further connected with a third end of the driving chip U1, a first end of the third resistor R3 is connected with a first end of the first resistor R1, a second end of the third resistor R3 is connected with a first end of the driving chip U1, an anode of the first regulator tube Z1 is connected with a second end of the third resistor R3, a cathode of the first regulator tube Z1 is connected with a cathode of the second regulator tube Z2, and an anode of the second regulator tube Z67 2 is connected with the first resistor R1, the anode of the diode D is connected with the fourth end of the driving chip U1, the cathode of the diode D is connected with the cathode of the third voltage-stabilizing tube Z3, the anode of the third voltage-stabilizing tube Z3 is connected with the drain electrode of the IGBT tube, the cathode of the fifth voltage-stabilizing tube Z5 is connected with the fourth end of the driving chip U1, and the anode of the fifth voltage-stabilizing tube Z5 is connected with the third end of the driving chip U1.
It should be noted that the driver chip U1 in this embodiment adopts EXB841, where pin 1 of the EXB841 is an output terminal of the driver chip U1, pin 15 is an input terminal of the driver chip U1, pin 1 is a first end of the driver chip U1, pin 2 is a second end, pin 9 is a third end, and pin 6 is a fourth end. When the pin 15 of the driving chip U1 inputs a high level, the pin 3 of the driving chip U1 outputs a high level, and the IGBT tube is controlled to be conducted; when the pin 15 of the driving chip U1 inputs a low level, the pin 3 of the driving chip U1 outputs a low level, thereby controlling the IGBT to be turned off.
Further, in the embodiment, the fifth voltage regulator tube Z5 plays a role in protection, so as to prevent the pin 6 of the driving chip U1 from bearing overvoltage, and detect whether overcurrent occurs through the diode D, the third voltage regulator tube Z3 is used for solving the problem that the overcurrent protection threshold is too high, the second resistor R2, the first capacitor C1 and the fourth voltage regulator tube Z4 are connected to a 20V power supply to ensure stable voltage, the first voltage regulator tube Z1 and the second voltage regulator tube Z2 prevent overvoltage from occurring on the gate and the source of the IGBT tube, and the first resistor R1 prevents the IGBT tube from being conducted by mistake; a variable resistor VR is connected between pins 5 and 4 of the driving chip U1, and a fourth capacitor C4 is connected between pin 4 and the ground, so that the turn-off time can be adjusted, and the reliability of soft turn-off is ensured.
As shown in fig. 4, in this embodiment, each of the inverting trigger circuits further includes: and the first input end of the blocking circuit is connected with the output end of the data communication circuit, the second input end of the blocking circuit is connected with the fault signal output end of the driving chip, and the output end of the blocking circuit is connected with the input end of the driving chip, so that when the driving chip detects that the IGBT tube has an overcurrent fault, the output signal of the data communication circuit is blocked to control the IGBT tube to be disconnected.
The lockout circuit specifically includes: an input end of the photoelectric coupler U2 is connected with a fault signal output end of the driving chip U1; the base electrode of the triode T is connected with the output end of the photoelectric coupler U2, and the emitting electrode of the triode T is grounded; a fifth resistor R5, a first end of the fifth resistor R5 is connected to the base of the transistor T, and a second end of the fifth resistor R5 is connected to a second power source VCC2 when in use; a sixth resistor R6, a first end of the sixth resistor R6 being connected to the collector of the transistor T, a second end of the sixth resistor R6 being connected to the second power VCC 2; a seventh resistor R7, a first end of the seventh resistor R7 being connected to a first end of the sixth resistor R6; a timer U3, wherein the input end of the timer U3 is connected with the second end of the seventh resistor R7; and a first input end of the AND circuit is connected with the output end of the timer U3, a second input end of the AND circuit is connected with the output end of the data communication circuit, and an output end of the AND circuit is connected with the input end of the driving chip U1.
In this embodiment, the photocoupler U2 adopts 6N137, the timer U3 adopts NE555P, when the IGBT normally operates, the pin 5 of the driving chip U1 is at a high level, the photocoupler U2 is in a cut-off state, the pin 6 of the photocoupler U2 is at a high level, the transistor Q is turned on, so the sixth capacitor C6 is not charged, the pin 3 of the timer U3 outputs a high level, the input signal is connected to the pin 15 of the driving chip through the and circuit, and the IGBT is normally driven; when the drive chip U1 detects overcurrent, 5 pins output low level, the photoelectric coupler U2 is turned on to cut off the triode T, the second power supply VCC voltage charges the sixth capacitor C6 through the sixth resistor R6 and the seventh resistor R7, the 3 pins of the timer U3 output low level, the input signal is blocked through the circuit, the input signal is stopped after the IGBT tube is in soft cut-off, the situation that the IGBT tube is immediately stopped to be cut off due to the fact that the input signal is immediately stopped is avoided, and the situation that the IGBT tube is burnt out due to overcurrent is prevented.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A variable frequency power supply system for rail flash welding, the system comprising:
the device comprises a power supply input circuit, a frequency conversion circuit, a load circuit, a control circuit and a data communication circuit;
the input end of the power input circuit is connected with a three-phase alternating current power supply when in use and is used for inputting alternating current output by the three-phase alternating current power supply into the track flash welding variable frequency power supply system through the power input circuit;
the frequency conversion circuit comprises a three-phase uncontrolled rectifier, a capacitive filter and an inverter, wherein the input end of the three-phase uncontrolled rectifier is connected with the output end of the power input circuit and used for rectifying alternating current output by the power input circuit into direct current, the input end of the capacitive filter is connected with the output end of the three-phase uncontrolled rectifier and used for filtering the direct current, and the input end of the inverter is connected with the output end of the capacitive filter and used for converting the filtered direct current into alternating current with different frequencies according to a trigger instruction;
the load circuit comprises a transformer, wherein the primary side of the transformer is connected with the output end of the inverter and is used for reducing the alternating current output by the inverter into low-voltage alternating current required by steel rail flash welding;
the control circuit comprises an isolation inversion trigger circuit, the input end of the isolation inversion trigger circuit is connected with the output end of the data communication circuit and is used for outputting a corresponding trigger signal to the inverter according to a control signal output by the data communication circuit so that the inverter outputs alternating current with corresponding frequency;
the data communication circuit is used for converting the received frequency parameters into corresponding control commands.
2. The orbital flash welding variable frequency power supply system of claim 1, wherein the inverter comprises:
the IGBT device comprises a first IGBT tube, a second IGBT tube, a third IGBT tube and a fourth IGBT tube;
the drain electrode of the first IGBT tube and the drain electrode of the second IGBT tube are connected with the positive output end of the capacitive filter, the source electrode of the third IGBT tube and the source electrode of the fourth IGBT tube are connected with the negative output end of the capacitive filter, the grid electrode of the first IGBT tube and the grid electrode of the fourth IGBT tube are connected with the first output end of the isolation inversion trigger circuit, and the grid electrode of the second IGBT tube and the grid electrode of the third IGBT tube are connected with the second output end of the isolation inversion trigger circuit;
the source electrode of the first IGBT tube is connected with the drain electrode of the third IGBT tube to form a first output end of the inverter, and the source electrode of the second IGBT tube is connected with the drain electrode of the fourth IGBT tube to form a second output end of the inverter.
3. The orbital flash welding variable frequency power supply system according to claim 2, wherein the isolated inverter trigger circuit comprises:
the output end of the first inversion trigger circuit is connected with the grid electrode of the first IGBT tube and the grid electrode of the fourth IGBT tube;
and the output end of the first inversion trigger circuit is connected with the grid electrode of the second IGBT tube and the grid electrode of the third IGBT tube.
4. The orbital flash welding variable frequency power supply system according to claim 3, wherein each inverter trigger circuit comprises:
the first end of the first resistor is connected with the grid electrode of the IGBT tube;
the input end of the driving chip is connected with the output end of the data communication circuit, the first output end of the driving chip is connected with the second end of the first resistor, the first end of the driving chip is connected with the source electrode of the IGBT tube, and the second end of the driving chip is connected with the first power supply when in use and is used for outputting corresponding voltage signals to control the turn-off and the turn-on of the IGBT tube according to the control signals output by the data communication circuit.
5. The orbital flash welding variable frequency power supply system according to claim 4, wherein each inverter trigger circuit further comprises:
the circuit comprises a first resistor, a second resistor, a diode, a first voltage regulator tube, a second voltage regulator tube, a third voltage regulator tube, a fourth voltage regulator tube, a fifth voltage regulator tube, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor;
wherein, the first end of the second resistor is connected with the first power supply, the second end of the second resistor is connected with the cathode of the fourth voltage-regulator tube, the anode of the fourth voltage-regulator tube is grounded, the first end of the first capacitor is connected with the cathode of the fourth voltage-regulator tube, the second end of the first capacitor is connected with the anode of the fourth voltage-regulator tube, the second end of the first capacitor is also connected with the third end of the driving chip, the first end of the third resistor is connected with the first end of the first resistor, the second end of the third resistor is connected with the first end of the driving chip, the anode of the first voltage-regulator tube is connected with the second end of the third resistor, the cathode of the first voltage-regulator tube is connected with the cathode of the second voltage-regulator tube, the anode of the second voltage-regulator tube is connected with the first end of the first resistor, and the anode of the diode is connected with the fourth end of the driving chip, the cathode of the diode is connected with the cathode of the third voltage-stabilizing tube, the anode of the third voltage-stabilizing tube is connected with the drain electrode of the IGBT tube, the cathode of the fifth voltage-stabilizing tube is connected with the fourth end of the driving chip, and the anode of the fifth voltage-stabilizing tube is connected with the third end of the driving chip.
6. The orbital flash welding variable frequency power supply system according to claim 4, wherein each inverter trigger circuit further comprises:
and the first input end of the blocking circuit is connected with the output end of the data communication circuit, the second input end of the blocking circuit is connected with the fault signal output end of the driving chip, and the output end of the blocking circuit is connected with the input end of the driving chip, so that when the driving chip detects that the IGBT tube has an overcurrent fault, the output signal of the data communication circuit is blocked to control the IGBT tube to be disconnected.
7. The track flash welding variable frequency power supply system of claim 6, wherein the lockout circuit comprises:
the input end of the photoelectric coupler is connected with the fault signal output end of the driving chip;
the base electrode of the triode is connected with the output end of the photoelectric coupler, and the emitting electrode of the triode is grounded;
a first end of the fifth resistor is connected with the base electrode of the triode, and a second end of the fifth resistor is connected with a second power supply when in use;
a first end of the sixth resistor is connected with the collector of the triode, and a second end of the sixth resistor is connected with the second power supply;
a first end of the seventh resistor is connected with a first end of the sixth resistor;
the input end of the timer is connected with the second end of the seventh resistor;
and the first input end of the AND circuit is connected with the output end of the timer, the second input end of the AND circuit is connected with the output end of the data communication circuit, and the output end of the AND circuit is connected with the input end of the driving chip.
8. The orbital flash welding variable frequency power supply system of claim 1, wherein the control circuit further comprises:
and the digital signal processor is connected with the isolation inversion trigger circuit, is also connected with the data communication circuit, and is used for receiving a control command or parameter setting from the data communication circuit and sending a corresponding voltage signal to the isolation inversion trigger circuit.
9. The orbital flash welding variable frequency power supply system of claim 8, wherein the control circuit further comprises:
the circuit comprises a leakage detection circuit, a tripping control circuit, a voltage detection circuit and a current detection circuit.
10. The orbital flash welding variable frequency power supply system of claim 8, wherein the data communication circuit comprises:
the microprocessor is connected with the digital signal processor and is used for exchanging data with the digital signal processor through the control command, the parameter setting and shared memory;
the I/O interface circuit is connected with the microprocessor, is also connected with the PLC, the key switch and the status indicator lamp when in use, and is used for realizing local control and monitoring through the I/O interface circuit;
and the communication bus is connected with the microprocessor, is also connected with the touch screen, the upper computer and the edge gateway when in use, and is used for realizing remote monitoring through the communication bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021815648.1U CN212977094U (en) | 2020-08-26 | 2020-08-26 | Variable-frequency power supply system for rail flash welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021815648.1U CN212977094U (en) | 2020-08-26 | 2020-08-26 | Variable-frequency power supply system for rail flash welding |
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