CN204633590U - The soft starting circuit of the source of welding current - Google Patents
The soft starting circuit of the source of welding current Download PDFInfo
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- CN204633590U CN204633590U CN201520154277.XU CN201520154277U CN204633590U CN 204633590 U CN204633590 U CN 204633590U CN 201520154277 U CN201520154277 U CN 201520154277U CN 204633590 U CN204633590 U CN 204633590U
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Abstract
The utility model discloses a kind of soft starting circuit of the source of welding current, comprise three-phase commutation bridge, soft start resistance loop protective circuit, power circuit, overvoltage/undervoltage testing circuit, relay circuit protective circuit and time delay relay circuit.The soft starting circuit of the utility model source of welding current greatly reduces the temporary impact electric current of starting shooting; simultaneously after power resistor damages, relay akinesia, avoids more serious fault; also add under-voltage and over-voltage protecting function in circuit, make source of welding current work safer.
Description
Technical field
The utility model relates to a kind of source of welding current field, particularly relates to a kind of soft starting circuit of the source of welding current.
Background technology
At present, the source of welding current is used in a large number, in order to meet welding performance demand, after the three-phase commutation bridge of source of welding current inside in the engineering construction of China, generally all to connect jumbo filter capacitor, if during start, the voltage of filter capacitor is zero, will produce very large temporary impact electric current, and the capacity of filter capacitor is larger, temporary impact electric current is larger, and distribution board may be caused to trip, and even causes the three-phase commutation bridge of the source of welding current to damage.
At present, the mode solving start temporary impact electric current has following several:
1: the electric capacity reducing filter capacitor, this mode can reduce start temporary impact electric current, guarantees that distribution board does not trip, ensures rectifier bridge work safety, but welding performance is had a certain impact, more particularly needs the welding manner of accurately control inapplicable to electric arc.
2: adopt the unsaturated inductance of series connection, this mode can reduce start temporary impact electric current, but DeGrain, an inverse electromotive force also can be produced during shutdown, cause a hidden trouble to the trouble free service of other circuit of the source of welding current, unsaturated inductance volume is large simultaneously, Heavy Weight.
3: adopt the thermistor of negative temperature coefficient to be connected on DC bus, when starting shooting, thermistor resistance is comparatively large, can limit start temporary impact electric current, thermistor is due to the effect of electric current, temperature raises, and resistance reduces until be equivalent to a wire, and this mode obviously can reduce start temporary impact electric current, if but start shooting again afterwards in shutdown at once, the temperature of thermistor is not also returned to room temperature, and resistance is now still very little, can produce very large temporary impact electric current equally.
4: adopt soft start resistance to add the mode of relay time delay connection, power resistor is in parallel with relay elder generation to be connected on DC bus again, during start, soft start resistance restriction start temporary impact electric current, engage relay again after time delay a period of time, this mode can be good at reducing start temporary impact electric current, but when soft start resistance interruption, electric capacity is not charged to electricity, and during time delay engage relay, the great temporary impact electric current that the high pressure at relay two ends can produce equally makes relay damaged.
Utility model content
The purpose of this utility model is just the soft starting circuit providing a kind of source of welding current in order to solve the problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of soft starting circuit of the source of welding current, comprise three-phase commutation bridge, soft start resistance loop protective circuit, power circuit, overvoltage/undervoltage testing circuit, relay circuit protective circuit and time delay relay circuit, the cathode voltage input of described time delay relay circuit is connected with the cathode voltage output of described three-phase commutation bridge, the cathode voltage output of described time delay relay circuit is connected with the cathode voltage input of described power circuit and the cathode voltage input of described overvoltage/undervoltage testing circuit respectively, the cathode voltage output of described overvoltage/undervoltage testing circuit is connected with the cathode voltage input of described relay circuit protective circuit and the cathode voltage input of described soft start resistance loop protective circuit respectively, the cathode voltage output of described relay circuit protective circuit is connected with the electrode input end of time delay relay circuit, the cathode voltage input of described three-phase commutation bridge, the cathode voltage input of described power circuit is all connected with the first earth terminal with the cathode voltage input of described overvoltage/undervoltage testing circuit, the cathode voltage input of described time delay relay circuit is connected with the first earth terminal.
Particularly, described soft start resistance loop protective circuit comprises the second resistance, 3rd resistance, 8th resistance, relay, first voltage stabilizing didoe, first metal-oxide-semiconductor and the first optocoupler, the first end of described first resistance respectively with the first end of described second resistance, the first end of the contact switch of described relay is connected with the cathode voltage output of described three-phase commutation bridge, second end of described first resistance is connected with the drain electrode of described first metal-oxide-semiconductor, second end of described second resistance is connected with the first end of described 3rd resistance and the collector terminal of described first optocoupler respectively, second end of described 3rd resistance is connected with the grid of described first metal-oxide-semiconductor and the negative pole of described first voltage stabilizing didoe respectively, the source electrode of described first metal-oxide-semiconductor respectively with the positive pole of described first voltage stabilizing didoe, the first end of described first electric capacity, the emitter terminal of described first optocoupler is connected with the second end of the contact switch of described relay and is the output of described soft starting circuit, the positive terminal of described first optocoupler is connected with the first end of described 8th resistance, the negative pole end of described first optocoupler is connected with the second end of described first electric capacity and described first earth terminal respectively.
The effect of soft start resistance loop protective circuit be under-voltage/overvoltage fault time turn off soft start resistance loop.
Particularly, described power circuit comprises the 4th resistance, 5th resistance, second voltage stabilizing didoe, 7th diode, three terminal regulator and the second electric capacity, the first end of described 4th resistance is connected with the source electrode of described first metal-oxide-semiconductor, second end of described 4th resistance respectively with the first end of described 5th resistance, the negative pole of described second voltage stabilizing didoe, the negative pole of described 7th diode is connected with the input of described three terminal regulator, the positive pole of described 7th diode respectively with the output of described three terminal regulator, the first end of described second electric capacity is connected with the first power end, second end of described second electric capacity, the voltage stabilizing end of described three terminal regulator, the positive pole of described second voltage stabilizing didoe is all connected with described first earth terminal with the second end of described 5th resistance.
The effect of power circuit is what power supply of soft start resistance loop protective circuit.
Particularly, described overvoltage/undervoltage testing circuit comprises the 6th resistance, 7th resistance, 9th resistance, tenth resistance, 11 resistance, 12 resistance, 27 resistance, double-limit comparator, 8th diode and the 9th diode, the first end of described 6th resistance is connected with the source electrode of described first metal-oxide-semiconductor, second end of described 6th resistance respectively with the first end of described 7th resistance, second pin of described double-limit comparator is connected with the 5th pin of described double-limit comparator, 6th pin of described double-limit comparator is connected with the first end of described 11 resistance and the first end of described 12 resistance respectively, 3rd pin of described double-limit comparator is connected with the first end of described 9th resistance and the first end of described tenth resistance respectively, second end of described 12 resistance, second end of described 9th resistance is all connected with described first power end with the 4th pin of described double-limit comparator, second end of described tenth resistance respectively, second end of described 7th resistance, 8th pin of described double-limit comparator, second pin of described 11 resistance is all connected with described first earth terminal with the first end of described 27 resistance, first pin of described double-limit comparator is connected with the positive pole of described 9th diode, 7th pin of described double-limit comparator is connected with the positive pole of described 8th diode, the first end of described 27 resistance respectively with the negative pole of described 8th diode, the negative pole of described 9th diode is connected with the second end of described 8th resistance.
Particularly, described relay circuit protective circuit comprises the 20 resistance, 21 resistance, 22 resistance, 24 resistance, 25 resistance, 26 resistance, first operational amplifier, second optocoupler, triode and the 4th voltage stabilizing didoe, the inverting input of described first operational amplifier is connected with the negative pole of described 8th diode, the in-phase input end of described first operational amplifier is connected with the first end of described 24 resistance and the first end of described 25 resistance respectively, the output of described first operational amplifier is connected with the first end of described 26 resistance, second end of described 26 resistance is connected with the positive terminal of described second optocoupler, the collector terminal of described second optocoupler is connected with the negative pole of described 4th voltage stabilizing didoe and the first end of described 22 resistance respectively, the positive pole of described 4th voltage stabilizing didoe is connected with the first end of described 21 resistance, the emitter terminal of described second optocoupler is connected with the described first end of the 20 resistance and the emitter of described triode respectively, the base stage of described triode is connected with the second end of described 20 resistance and the second end of described 21 resistance respectively, the emitter of described triode is connected with the first end of the 19 resistance, second end of described 24 resistance is connected with described first power end, second end of described 25 resistance is all connected with described first earth terminal with the negative pole end of described second optocoupler, second end of described 22 resistance is connected with second source end, the emitter of described triode is connected with the second earth terminal.
The effect of relay circuit protective circuit be under-voltage/overvoltage fault time turn off relay circuit.
Particularly, described time delay relay circuit comprises the first resistance, 13 resistance, 14 resistance, 15 resistance, 16 resistance, 17 resistance, 18 resistance, 19 resistance, first electric capacity, 3rd electric capacity, second operational amplifier, 3rd voltage stabilizing didoe, second metal-oxide-semiconductor and the tenth diode, the first end of described first resistance respectively with the first end of described second resistance, the first end of the contact switch of described relay is connected with the cathode voltage output of described three-phase commutation bridge, second end of described first resistance is connected with the drain electrode of described first metal-oxide-semiconductor, the emitter of described triode is connected with the first end of described 19 resistance, the first end of described 17 resistance respectively with the first end of described 18 resistance, the first end of described 3rd electric capacity is connected with the second end of described 19 resistance, second end of described 3rd electric capacity is connected with the second end of described 18 resistance and described second earth terminal respectively, second end of described 17 resistance is connected with described second source end, the first end of described 16 resistance is connected with the second end of described 17 resistance, second end of described 16 resistance is connected with the first end of described 15 resistance and the inverting input of described second operational amplifier, the in-phase input end of described second operational amplifier is connected with the first end of described 19 resistance, the output of described second operational amplifier is connected with the first end of described 14 resistance, second end of described 14 resistance respectively with the first end of described 13 resistance, the negative pole of described 3rd voltage stabilizing didoe is connected with the grid of described second metal-oxide-semiconductor, second end of described 13 resistance is connected with the positive pole of described 3rd voltage stabilizing didoe and the source electrode of described second metal-oxide-semiconductor respectively, the drain electrode of described second metal-oxide-semiconductor is connected with the described positive pole of the tenth diode and the first end of described relay respectively, second end of described relay is connected with the positive pole of described tenth diode, second end of described 15 resistance, the cathode voltage input of described second operational amplifier is connected with described second source end with the negative pole of described tenth diode, the cathode voltage input of described second operational amplifier is connected with described second earth terminal with the positive pole of described 3rd voltage stabilizing didoe.
The beneficial effects of the utility model are:
The soft starting circuit of the utility model source of welding current greatly reduces the temporary impact electric current of starting shooting; simultaneously after power resistor damages, relay akinesia, avoids more serious fault; also add under-voltage and over-voltage protecting function in circuit, make source of welding current work safer.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the soft starting circuit of the utility model source of welding current.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the soft starting circuit of the utility model source of welding current, comprise three-phase commutation bridge, soft start resistance loop protective circuit, power circuit, overvoltage/undervoltage testing circuit, relay circuit protective circuit and time delay relay circuit, the cathode voltage input of described time delay relay circuit is connected with the cathode voltage output of described three-phase commutation bridge, the cathode voltage output of described time delay relay circuit is connected with the cathode voltage input of described power circuit and the cathode voltage input of described overvoltage/undervoltage testing circuit respectively, the cathode voltage output of described overvoltage/undervoltage testing circuit is connected with the cathode voltage input of described relay circuit protective circuit and the cathode voltage input of described soft start resistance loop protective circuit respectively, the cathode voltage output of described relay circuit protective circuit is connected with the electrode input end of time delay relay circuit, the cathode voltage input of described three-phase commutation bridge, the cathode voltage input of described power circuit is all connected with the first earth terminal with the cathode voltage input of described overvoltage/undervoltage testing circuit, the cathode voltage input of described time delay relay circuit is connected with the first earth terminal, soft start resistance loop protective circuit comprises the second resistance R2, 3rd resistance R3, 8th resistance R8, relay K, first electric capacity C1, first voltage stabilizing didoe DZ1, first metal-oxide-semiconductor Q1 and the first optocoupler U1, second end of the second resistance R2 is connected with the first end of the 3rd resistance R3 and the collector terminal of the first optocoupler U1 respectively, second end of the 3rd resistance R3 is connected with the grid of the first metal-oxide-semiconductor Q1 and the negative pole of the first voltage stabilizing didoe DZ1 respectively, the source electrode of the first metal-oxide-semiconductor Q1 respectively with the positive pole of the first voltage stabilizing didoe DZ1, the first end of the first electric capacity C1, the emitter terminal of the first optocoupler U1 is connected with the second end of the contact switch of relay K and is the output of soft starting circuit, the positive terminal of the first optocoupler U1 is connected with the first end of the 8th resistance R8, the negative pole end of the first optocoupler U1 is connected with second end of the first electric capacity C1 and the first earth terminal respectively, power circuit comprises the 4th resistance R4, 5th resistance R5, second voltage stabilizing didoe DZ2, 7th diode D7, three terminal regulator U2 and the second electric capacity C2, the first end of the 4th resistance R4 is connected with the source electrode of the first metal-oxide-semiconductor Q1, second end of the 4th resistance R4 respectively with the first end of the 5th resistance R5, the negative pole of the second voltage stabilizing didoe DZ2, the negative pole of the 7th diode D7 is connected with the input of three terminal regulator U2, the positive pole of the 7th diode D7 respectively with the output of three terminal regulator U2, the first end of the second electric capacity C2 is connected with the first power end, second end of the second electric capacity C2, the voltage stabilizing end of three terminal regulator U2, the positive pole of the second voltage stabilizing didoe DZ2 is all connected with the first earth terminal with second end of the 5th resistance R5, overvoltage/undervoltage testing circuit comprises the 6th resistance R6, 7th resistance R7, 9th resistance R9, tenth resistance R10, 11 resistance R11, 12 resistance R12, 27 resistance R27, double-limit comparator U3, 8th diode D8 and the 9th diode D9, the first end of the 6th resistance R6 is connected with the source electrode of the first metal-oxide-semiconductor Q1, second end of the 6th resistance R6 respectively with the first end of the 7th resistance R7, second pin of double-limit comparator U3 is connected with the 5th pin of double-limit comparator U3, 6th pin of double-limit comparator U3 is connected with the first end of the 11 resistance R11 and the first end of the 12 resistance R12 respectively, 3rd pin of double-limit comparator U3 is connected with the first end of the 9th resistance R9 and the first end of the tenth resistance R10 respectively, second end of the 12 resistance R12, second end of the 9th resistance R9 is all connected with the first power end with the 4th pin of double-limit comparator U3, second end of the tenth resistance R10 respectively, second end of the 7th resistance R7, 8th pin of double-limit comparator U3, second pin of the 11 resistance R11 is all connected with the first earth terminal with the first end of the 27 resistance R27, first pin of double-limit comparator U3 is connected with the positive pole of the 9th diode D9, 7th pin of double-limit comparator U3 is connected with the positive pole of the 8th diode D8, the first end of the 27 resistance R27 respectively with the negative pole of the 8th diode D8, the negative pole of the 9th diode D9 is connected with second end of the 8th resistance R8, relay circuit protective circuit comprises the 20 resistance R20, 21 resistance R21, 22 resistance R22, 24 resistance R24, 25 resistance R25, 26 resistance R26, first operational amplifier U3C, second optocoupler U4, triode Q3 and the 4th voltage stabilizing didoe DZ4, the inverting input of the first operational amplifier U3C is connected with the negative pole of the 8th diode D8, the in-phase input end of the first operational amplifier U3C is connected with the first end of the 24 resistance R24 and the first end of the 25 resistance R25 respectively, the output of the first operational amplifier U3C is connected with the first end of the 26 resistance R26, second end of the 26 resistance R26 is connected with the positive terminal of the second optocoupler U4, the collector terminal of the second optocoupler U4 is connected with the negative pole of the 4th voltage stabilizing didoe DZ4 and the first end of the 22 resistance R22 respectively, the positive pole of the 4th voltage stabilizing didoe DZ4 is connected with the first end of the 21 resistance R21, the emitter terminal of the second optocoupler U4 is connected with the first end of the 20 resistance R20 and the emitter of triode Q3 respectively, the base stage of triode Q3 is connected with second end of the 20 resistance R20 and second end of the 21 resistance R21 respectively, second end of the 24 resistance R24 is connected with the first power end, second end of the 25 resistance R25 is all connected with the first earth terminal with the negative pole end of the second optocoupler U4, second end of the 22 resistance R22 is connected with second source end, the emitter of triode Q3 is connected with the second earth terminal, time delay relay circuit comprises the first resistance R1, 19 resistance R19, 17 resistance R17, 18 resistance R18, 3rd electric capacity C3, 13 resistance R13, 14 resistance R14, 15 resistance R15, 16 resistance R16, second operational amplifier U5A, 3rd voltage stabilizing didoe DZ3, second metal-oxide-semiconductor Q2 and the tenth diode D10, the first end of the first resistance R1 respectively with the first end of the second resistance R2, the first end of the contact switch of relay K is connected with the cathode voltage output of three-phase commutation bridge, the emitter of triode Q3 is connected with the first end of the 19 resistance R19, second end of the first resistance R1 is connected with the drain electrode of the first metal-oxide-semiconductor Q1, the first end of the 17 resistance R17 respectively with the first end of the 18 resistance R18, the first end of the 3rd electric capacity C3 is connected with second end of the 19 resistance R19, second end of the 3rd electric capacity C3 is connected with second end of the 18 resistance R18 and the second earth terminal respectively, second end of the 17 resistance R17 is connected with second source end, the first end of the 16 resistance R16 is connected with second end of the 17 resistance R17, second end of the 16 resistance R16 is connected with the inverting input of the first end of the 15 resistance R15 and the second operational amplifier U5A, the in-phase input end of the second operational amplifier U5A is connected with the first end of the 19 resistance R19, the output of the second operational amplifier U5A is connected with the first end of the 14 resistance R14, second end of the 14 resistance R14 respectively with the first end of the 13 resistance R13, the negative pole of the 3rd voltage stabilizing didoe DZ3 is connected with the grid of the second metal-oxide-semiconductor Q2, second end of the 13 resistance R13 is connected with the positive pole of the 3rd voltage stabilizing didoe DZ3 and the source electrode of the second metal-oxide-semiconductor Q2 respectively, the drain electrode of the second metal-oxide-semiconductor Q2 is connected with the positive pole of the tenth diode D10 and the first end of relay K respectively, second end of relay K is connected with the positive pole of the tenth diode D10, second end of the 15 resistance R15, the cathode voltage input of the second operational amplifier U5A is connected with second source end with the negative pole of the tenth diode D10, the cathode voltage input of the second operational amplifier U5A is connected with the second earth terminal with the positive pole of the 3rd voltage stabilizing didoe DZ3
The operation principle of the soft starting circuit of the utility model source of welding current is as follows:
Wire 101, one end of 102 and 103 connects three phase lines of three-phase alternating current respectively, the other end connects the ac input end of the three-phase commutation bridge be made up of to the 6th diode D6 the first diode D1 respectively, three-phase commutation bridge becomes direct current three-phase alternating current rectification, first electric capacity C1 is large bulk capacitance, first resistance R1 and relay K are the critical components of soft starting circuit, one termination first electric capacity C1 of wire 104, the other end receives the input of source of welding current inverter circuit, second resistance R2, 3rd resistance R3 and the first voltage stabilizing didoe DZ1 is connected in parallel on relay K two ends, for controlling the break-make of the first resistance R1 charge circuit, 4th resistance R4 and the 5th resistance R5 is to the dividing potential drop of voltage on the first electric capacity C1, again through the voltage stabilizing of three terminal regulator U2 and the filtering of the second electric capacity C2, obtain the voltage of the first power end, second voltage stabilizing didoe DZ2 limits the input voltage of three terminal regulator U2, the double-limit comparator U3 be made up of amplifier U3A and amplifier U3B connects the first power end and the first earth terminal, voltage on first electric capacity C1 is divided into Uf through the 6th resistance R6 and the 7th resistance R7,11 resistance R11 and the 12 resistance R12 set pressure point Ug1, and the 9th resistance R9 and the tenth resistance R10 sets under-voltage some Ug2.19 resistance R19 to the 22 resistance R22, the 24 resistance R24 value the 26 resistance R26, the first operational amplifier U3C, the second optocoupler U4, NPN type triode Q3 and the 3rd voltage stabilizing didoe DZ3 form under-voltage/overvoltage fault time turn off the protective circuit in relay K loop, when the anti-phase input terminal potential of the first operational amplifier U3C is low, its output current potential is high, second optocoupler U4 conducting, the cathode potential of the 4th voltage stabilizing didoe DZ4 is low, triode Q3 not conducting; When the anti-phase input terminal potential of the first operational amplifier U3C is high, its output current potential is low, the second optocoupler U4 not conducting, and the cathode potential of the 4th voltage stabilizing didoe DZ4 is high, triode Q3 conducting.
Upon power-up, the two ends of relay K disconnect, there is pressure reduction simultaneously, also pressure reduction is had between the grid of the first metal-oxide-semiconductor Q1 and source electrode, first metal-oxide-semiconductor Q1 conducting, the direct current that rectifier bridge exports is charged to the first electric capacity C1 by the first resistance R1, due to the metering function of the first resistance R1, start temporary impact electric current is greatly reduced, and second source end charges slowly to the first electric capacity C1 by the 17 resistance R17, when the in-phase input end voltage of the second operational amplifier U5A is greater than the reference point voltage arranged by the 15 resistance R15 and the 16 resistance R16, the output of the first operational amplifier U3C exports high level, the second metal-oxide-semiconductor Q2 conducting is made by the 14 resistance R14, then the coil of relay K has electric current to flow through to make relay K conducting, simultaneously along with the continuous rising of voltage on the first electric capacity C1, the pressure drop at relay K two ends constantly reduces, voltage between the grid of the first metal-oxide-semiconductor Q1 and source electrode is also in continuous reduction, when being less than the shutoff voltage of the first metal-oxide-semiconductor Q1, first metal-oxide-semiconductor Q1 turns off, first resistance R1 turns off to loop that the first electric capacity C1 charges, and the direct current that three-phase commutation bridge exports flows to the first electric capacity C1 filtering by relay K and flows to through wire 104 in the inverter circuit of the source of welding current again and go, and realizes the effect of soft start.
When there is open circuit in the first resistance R1, the direct current that three-phase commutation bridge exports does not charge to the first electric capacity C1 by the first resistance R1, and first voltage on electric capacity C1 be zero, then the output voltage of three terminal regulator U2 is also zero, double-limit comparator U3 and the first operational amplifier U3C does not all work, second optocoupler U4 also can not conducting, the cathode potential of the 4th voltage stabilizing didoe DZ4 is high, triode Q3 conducting, the in-phase input end current potential of the second operational amplifier U5A is unanimously zero, then its output is also low level, second metal-oxide-semiconductor Q2 not conducting, relay K also just can not conducting, thus the object realizing occurring open circuit as the first resistance R1 and forbid allowing relay K closed.
When Uf be greater than under-voltage some Ug2 and be less than pressure point Ug1 and power supply normal time, 7 pin of double-limit comparator U3 export as low level, 1 pin of double-limit comparator U3 exports as low level, the negative electrode of the 8th diode D8 and the 9th diode D9 is low level, first optocoupler U1 not conducting, second optocoupler U4 conducting, triode Q3 not conducting, now under-voltage/overvoltage crowbar does not work; When Uf is less than under-voltage some Ug2 and is under-voltage, 7 pin of double-limit comparator U3 export as low level, and 1 pin of double-limit comparator U3 exports as high level, and the negative electrode of the 8th diode D8 and the 9th diode D9 is high level; When Uf was greater than pressure point Ug1 and overvoltage, 7 pin of double-limit comparator U3 exported as high level, and 1 pin of double-limit comparator U3 exports as low level, and the negative electrode of the 8th diode D8 and the 9th diode D9 is high level.When under-voltage or overvoltage, the negative electrode of the 8th diode D8 and the 9th diode D9 is all high level, first optocoupler U1 conducting, first metal-oxide-semiconductor Q1 grid and source electrode between pressure drop be zero can not conducting, and the first metal-oxide-semiconductor Q1 and the first resistance R1 is connected in series, so three-phase commutation bridge rectification direct current out can not give the first electric capacity C1 and other circuit supplies through the first resistance R1; First operational amplifier U3C exports as low level simultaneously, second optocoupler U4 not conducting, the cathode potential of the 4th voltage stabilizing didoe DZ4 is high level, triode Q3 conducting, the anti-phase input terminal potential of the second operational amplifier U5A is low, its output current potential is also low, second metal-oxide-semiconductor Q2 not conducting, relay K also just can not conducting, then three-phase commutation bridge rectification direct current out also can not give the first electric capacity C1 and other circuit supplies through relay K, thus realize under-voltage/overvoltage time turn off welding power source main loop, guarantee the object of equipment safety operation.
The utility model circuit contains two groups of power supplies: the first power end (+5V), first earth terminal (GND1) and second source end (+24V), second earth terminal (GND2), wherein, GND1 is connected with the negative output terminal of three-phase commutation bridge ,+5V by the voltage on the first electric capacity C1 through voltage stabilizing process; + 24V, GND2 are by three-phase alternating current step-down rectifying and wave-filtering again, and reference ground GND1 and GND2 of two groups of power supplies is isolation.
The advantage that circuit of the present utility model possesses is:
1: after three phase rectifier, jumbo electric capacity can be connect, ensure the demand of high-quality welding performance.
2: during start, can greatly reduce temporary impact electric current, avoid distribution board to trip or rectifier bridge damage.
3: circuit is simple, and volume is little, lightweight.
4: when shutting down, can not inverse electromotive force be produced, ensure the safety of other circuit of the source of welding current.
5: soft start effect does not affect by the switching on and shutting down time interval.
6: soft start resistance can be avoided relay K conducting, avoid more catastrophe failure after damaging.
7: add under-voltage while soft start, overvoltage protection, do not need to detect under-voltage and overvoltage by transformer pressure-reducing, simplify circuit.
Above content is the further description done the utility model in conjunction with concrete preferred implementation, is convenient to these those skilled in the art and can understands and apply the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, some simple deduction or replace can also be made without departing from the concept of the premise utility, and need not through performing creative labour.Therefore, those skilled in the art are according to announcement of the present utility model, and the simple modifications made the utility model all should within protection range of the present utility model.
Claims (6)
1. the soft starting circuit of a source of welding current, comprise three-phase commutation bridge, it is characterized in that: also comprise soft start resistance loop protective circuit, power circuit, overvoltage/undervoltage testing circuit, relay circuit protective circuit and time delay relay circuit, the cathode voltage input of described time delay relay circuit is connected with the cathode voltage output of described three-phase commutation bridge, the cathode voltage output of described time delay relay circuit is connected with the cathode voltage input of described power circuit and the cathode voltage input of described overvoltage/undervoltage testing circuit respectively, the cathode voltage output of described overvoltage/undervoltage testing circuit is connected with the cathode voltage input of described relay circuit protective circuit and the cathode voltage input of described soft start resistance loop protective circuit respectively, the cathode voltage output of described relay circuit protective circuit is connected with the electrode input end of time delay relay circuit, the cathode voltage input of described three-phase commutation bridge, the cathode voltage input of described power circuit is all connected with the first earth terminal with the cathode voltage input of described overvoltage/undervoltage testing circuit, the cathode voltage input of described time delay relay circuit is connected with the first earth terminal.
2. the soft starting circuit of the source of welding current according to claim 1, it is characterized in that: described soft start resistance loop protective circuit comprises the second resistance, 3rd resistance, 8th resistance, relay, first voltage stabilizing didoe, first metal-oxide-semiconductor and the first optocoupler, second end of described second resistance is connected with the first end of described 3rd resistance and the collector terminal of described first optocoupler respectively, second end of described 3rd resistance is connected with the grid of described first metal-oxide-semiconductor and the negative pole of described first voltage stabilizing didoe respectively, the source electrode of described first metal-oxide-semiconductor respectively with the positive pole of described first voltage stabilizing didoe, the emitter terminal of described first optocoupler is connected with the second end of the contact switch of described relay and is the output of described soft starting circuit, the positive terminal of described first optocoupler is connected with the first end of described 8th resistance, the negative pole end of described first optocoupler is connected with described first earth terminal.
3. the soft starting circuit of the source of welding current according to claim 2, it is characterized in that: described power circuit comprises the 4th resistance, 5th resistance, second voltage stabilizing didoe, 7th diode, three terminal regulator and the second electric capacity, the first end of described 4th resistance is connected with the source electrode of described first metal-oxide-semiconductor, second end of described 4th resistance respectively with the first end of described 5th resistance, the negative pole of described second voltage stabilizing didoe, the negative pole of described 7th diode is connected with the input of described three terminal regulator, the positive pole of described 7th diode respectively with the output of described three terminal regulator, the first end of described second electric capacity is connected with the first power end, second end of described second electric capacity, the voltage stabilizing end of described three terminal regulator, the positive pole of described second voltage stabilizing didoe is all connected with described first earth terminal with the second end of described 5th resistance.
4. the soft starting circuit of the source of welding current according to claim 3, it is characterized in that: described overvoltage/undervoltage testing circuit comprises the 6th resistance, 7th resistance, 9th resistance, tenth resistance, 11 resistance, 12 resistance, 27 resistance, double-limit comparator, 8th diode and the 9th diode, the first end of described 6th resistance is connected with the source electrode of described first metal-oxide-semiconductor, second end of described 6th resistance respectively with the first end of described 7th resistance, second pin of described double-limit comparator is connected with the 5th pin of described double-limit comparator, 6th pin of described double-limit comparator is connected with the first end of described 11 resistance and the first end of described 12 resistance respectively, 3rd pin of described double-limit comparator is connected with the first end of described 9th resistance and the first end of described tenth resistance respectively, second end of described 12 resistance, second end of described 9th resistance is all connected with described first power end with the 4th pin of described double-limit comparator, second end of described tenth resistance respectively, second end of described 7th resistance, 8th pin of described double-limit comparator, second pin of described 11 resistance is all connected with described first earth terminal with the first end of described 27 resistance, first pin of described double-limit comparator is connected with the positive pole of described 9th diode, 7th pin of described double-limit comparator is connected with the positive pole of described 8th diode, the first end of described 27 resistance respectively with the negative pole of described 8th diode, the negative pole of described 9th diode is connected with the second end of described 8th resistance.
5. the soft starting circuit of the source of welding current according to claim 4, it is characterized in that: described relay circuit protective circuit comprises the 20 resistance, 21 resistance, 22 resistance, 24 resistance, 25 resistance, 26 resistance, first operational amplifier, second optocoupler, triode and the 4th voltage stabilizing didoe, the inverting input of described first operational amplifier is connected with the negative pole of described 8th diode, the in-phase input end of described first operational amplifier is connected with the first end of described 24 resistance and the first end of described 25 resistance respectively, the output of described first operational amplifier is connected with the first end of described 26 resistance, second end of described 26 resistance is connected with the positive terminal of described second optocoupler, the collector terminal of described second optocoupler is connected with the negative pole of described 4th voltage stabilizing didoe and the first end of described 22 resistance respectively, the positive pole of described 4th voltage stabilizing didoe is connected with the first end of described 21 resistance, the emitter terminal of described second optocoupler is connected with the described first end of the 20 resistance and the emitter of described triode respectively, the base stage of described triode is connected with the second end of described 20 resistance and the second end of described 21 resistance respectively, the emitter of described triode is connected with the first end of the 19 resistance, second end of described 24 resistance is connected with described first power end, second end of described 25 resistance is all connected with described first earth terminal with the negative pole end of described second optocoupler, second end of described 22 resistance is connected with second source end, the emitter of described triode is connected with the second earth terminal.
6. the soft starting circuit of the source of welding current according to claim 5, it is characterized in that: described time delay relay circuit comprises the first resistance, 13 resistance, 14 resistance, 15 resistance, 16 resistance, 17 resistance, 18 resistance, 19 resistance, first electric capacity, 3rd electric capacity, second operational amplifier, 3rd voltage stabilizing didoe, second metal-oxide-semiconductor and the tenth diode, the first end of described first resistance respectively with the first end of described second resistance, the first end of the contact switch of described relay is connected with the cathode voltage output of described three-phase commutation bridge, second end of described first resistance is connected with the drain electrode of described first metal-oxide-semiconductor, the emitter of described triode is connected with the first end of described 19 resistance, the first end of described 17 resistance respectively with the first end of described 18 resistance, the first end of described 3rd electric capacity is connected with the second end of described 19 resistance, second end of described 3rd electric capacity is connected with the second end of described 18 resistance and described second earth terminal respectively, second end of described 17 resistance is connected with described second source end, the first end of described 16 resistance is connected with the second end of described 17 resistance, second end of described 16 resistance is connected with the first end of described 15 resistance and the inverting input of described second operational amplifier, the in-phase input end of described second operational amplifier is connected with the first end of described 19 resistance, the output of described second operational amplifier is connected with the first end of described 14 resistance, second end of described 14 resistance respectively with the first end of described 13 resistance, the negative pole of described 3rd voltage stabilizing didoe is connected with the grid of described second metal-oxide-semiconductor, second end of described 13 resistance is connected with the positive pole of described 3rd voltage stabilizing didoe and the source electrode of described second metal-oxide-semiconductor respectively, the drain electrode of described second metal-oxide-semiconductor is connected with the described positive pole of the tenth diode and the first end of described relay respectively, second end of described relay is connected with the positive pole of described tenth diode, second end of described 15 resistance, the cathode voltage input of described second operational amplifier is connected with described second source end with the negative pole of described tenth diode, the cathode voltage input of described second operational amplifier is connected with described second earth terminal with the positive pole of described 3rd voltage stabilizing didoe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111785569A (en) * | 2020-06-29 | 2020-10-16 | 佛山科学技术学院 | Soft-start relay control circuit and charging circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111785569A (en) * | 2020-06-29 | 2020-10-16 | 佛山科学技术学院 | Soft-start relay control circuit and charging circuit |
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