CN215393069U - Pilot arc circuit for AC/DC argon arc welding machine - Google Patents
Pilot arc circuit for AC/DC argon arc welding machine Download PDFInfo
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- CN215393069U CN215393069U CN202120858166.2U CN202120858166U CN215393069U CN 215393069 U CN215393069 U CN 215393069U CN 202120858166 U CN202120858166 U CN 202120858166U CN 215393069 U CN215393069 U CN 215393069U
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Abstract
The utility model discloses a pilot arc circuit of an alternating current-direct current argon arc welding machine, which comprises: the full-bridge inverter circuit is used for inverting the input direct-current voltage into square-wave voltage; the primary side of the transformer is connected with the output end of the full-bridge inverter circuit, and the secondary side of the transformer is provided with a center tap; the main pilot arc module is connected with the secondary side of the transformer and used for generating and outputting main pilot arc voltage; and the auxiliary pilot arc module is connected with a center tap of the transformer and used for generating and outputting an auxiliary pilot arc voltage. The utility model only needs to adopt a single PWM modulation chip, and has simpler structure and lower cost.
Description
Technical Field
The utility model relates to the technical field of electric welding machine circuits, in particular to an arc maintaining circuit of an alternating current-direct current argon arc welding machine.
Background
The problem that the AC-DC argon arc welding machine cannot avoid always exists: during the process of output alternating current commutation, because the current needs to pass through a zero point, the phenomenon of easy arc breaking exists. Therefore, the welder requires an additional high voltage power supply to provide energy at the current zero crossing to maintain the arc. In the traditional method, a high-power high-voltage power source which is additionally designed and can continuously supply power is generally adopted to continuously provide energy for maintaining electric arcs, but the method has the disadvantages of complex circuit and high cost, causes the waste of electric energy, occupies the volume of an electric welding machine, and can not realize the miniaturization of the alternating current/direct current argon arc welding machine.
Based on the defects, the prior art develops the arc maintaining circuit of the alternating current-direct current argon arc welding machine, which adopts the constant current circuit with two UC3843 chips to respectively control negative pressure and the constant current circuit with positive pressure, and the circuit is simple, low in cost, not concise and high in cost.
SUMMERY OF THE UTILITY MODEL
According to an embodiment of the present invention, there is provided an arc maintenance circuit for an ac/dc argon arc welding machine, including:
the full-bridge inverter circuit is used for inverting the input direct-current voltage into square-wave voltage;
the primary side of the transformer is connected with the output end of the full-bridge inverter circuit, and the secondary side of the transformer is provided with a center tap;
the main pilot arc module is connected with the secondary side of the transformer and used for generating and outputting main pilot arc voltage;
and the auxiliary pilot arc module is connected with a center tap of the transformer and used for generating and outputting an auxiliary pilot arc voltage.
Further, the main dimension arc module comprises:
the input end of the first rectifying circuit is connected with the secondary side of the transformer and used for rectifying the square wave voltage output by the secondary side of the transformer into direct current voltage;
the emitter of the first IGBT is connected with the collector of the second IGBT and used for outputting alternating current main pilot arc voltage, the collector of the first IGBT is connected with the direct current positive pole of the first rectification circuit, and the emitter of the second IGBT is connected with the direct current negative pole of the first rectification circuit.
Further, the auxiliary pilot arc module comprises:
the input end of the second rectifying circuit is connected with a center tap of the transformer and is used for rectifying the square wave voltage output by the secondary side of the transformer into direct current voltage;
the two ends of the energy storage capacitor are respectively connected with the direct current positive electrode and the direct current negative electrode of the second rectifying circuit;
and the auxiliary pilot arc voltage control module is connected with the energy storage capacitor and is used for controlling the generation and output of the auxiliary pilot arc voltage.
Further, the energy storage capacitor is a polar capacitor.
Further, the auxiliary pilot arc module further comprises:
and the filter capacitor is connected with the energy storage capacitor in parallel.
Further, the auxiliary pilot arc voltage control module comprises:
the PWM modulation chip is used for outputting PWM waves;
the grid electrode of the third IGBT is connected with the output end of the PWM modulation chip, and the PWM wave drives the third IGBT to work;
one end of the output inductor is connected with the collector electrode of the third IGBT;
the emitter of the fourth IGBT is connected with the collector of the fifth IGBT and used for outputting alternating current auxiliary pilot arc voltage, the collector of the fourth IGBT is connected with the direct current positive electrode of the second rectifying circuit, and the emitter of the fifth IGBT is connected with the other end of the output inductor;
the two ends of the feedback resistor are respectively connected with a voltage feedback pin and a reference voltage pin of the PWM chip;
and the input end of the chip opening circuit is connected with an external signal, and the output end of the chip opening circuit is connected with a voltage feedback pin of the PWM modulation chip and is used for opening the PWM modulation chip to output PWM waves.
Further, the auxiliary pilot arc voltage control module further comprises: a first protection diode and a second protection diode; the anode of the first protection diode is connected with the collector of the fourth IGBT, and the cathode of the first protection diode is connected with the direct-current positive electrode of the first rectifying circuit; and the cathode of the second protection diode is connected with the emitter of the fifth IGBT, and the anode of the second protection diode is connected with the direct current cathode of the first rectifying circuit.
Further, the auxiliary pilot arc voltage control module further comprises: and the anode of the third protection diode is connected with the collector of the third IGBT, and the cathode of the third protection diode is connected with the direct-current anode of the second rectifying circuit.
Further, the chip turn-on circuit includes:
the input end of the voltage division circuit is connected with an external signal;
and the input end of the optical coupler is connected with the output end of the voltage division circuit, and the output end of the optical coupler is connected with a voltage feedback pin of the PWM modulation chip.
According to the alternating current-direct current argon arc welding machine arc maintenance circuit, only a single PWM modulation chip is needed, the structure is simpler, and the cost is lower.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology.
Drawings
FIG. 1 is a schematic block diagram of an arc maintenance circuit of an AC/DC argon arc welding machine according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a main pilot arc voltage generating and outputting circuit of a pilot arc circuit of an AC/DC argon arc welding machine according to an embodiment of the utility model;
FIG. 3 is a schematic diagram of an auxiliary pilot arc voltage generating and outputting circuit of a pilot arc circuit of an AC/DC argon arc welding machine according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings.
First, a pilot arc circuit of an ac/dc argon arc welding machine according to an embodiment of the present invention will be described with reference to fig. 1 to 3, which is used for pilot arc of an ac/dc argon arc welding machine and has a wide application range.
As shown in fig. 1, an arc maintenance circuit for an ac/dc argon arc welding machine according to an embodiment of the present invention includes: the power supply comprises a full-bridge inverter circuit 1, a transformer 2, a main pilot arc module 3 and an auxiliary pilot arc module 4. The full-bridge inverter circuit 1 is configured to invert an input dc voltage into a square wave voltage, and in this embodiment, as shown in fig. 2, the full-bridge inverter circuit is implemented by four IGBTs: t1, T2, T3 and T4 generate high-voltage square waves; the primary side of the transformer 2 is connected with the output end of the full-bridge inverter circuit 1, the secondary side of the transformer 2 is provided with a center tap J1, the main pilot arc module 3 is connected with the secondary side of the transformer 2 and used for generating and outputting a main pilot arc voltage J3, and the auxiliary pilot arc module 4 is connected with the center tap J1 of the transformer 2 and used for generating and outputting an auxiliary pilot arc voltage J4.
Specifically, as shown in fig. 2, the main pilot arc module 3 includes: a first rectifier circuit 31, a first IGBT (Insulated Gate Bipolar Transistor) 32 and a second IGBT33 connected in series.
Further, as shown in fig. 2, the input terminal of the first rectifying circuit 31 is connected to the secondary side of the transformer 2 for rectifying the square wave voltage output by the secondary side of the transformer 2 into a dc voltage, in the present embodiment, the first rectifying circuit 31 employs a full bridge rectifying circuit with four diodes D4, D5, D6 and D7, wherein the cathodes of the diodes D4 and D6 are anodes of the dc output, and the other two diodes D5 and D7 are cathodes of the dc output.
Further, as shown in fig. 2, an emitter of the first IGBT32 is connected to a collector of the second IGBT33 for outputting an ac main pilot voltage J3, a collector of the first IGBT32 is connected to a dc positive electrode of the first rectifier circuit 31, and an emitter of the second IGBT33 is connected to a dc negative electrode of the first rectifier circuit 31.
Specifically, as shown in fig. 3, the auxiliary pilot arc module 4 includes: a second rectifying circuit 41, an energy storage capacitor C1 and an auxiliary pilot arc voltage control module. The input end of the second rectifying circuit 41 is connected to a center tap J1 of the transformer 2, and is configured to rectify the square wave voltage output by the secondary side of the transformer 2 into a direct current voltage; two ends of the energy storage capacitor C1 are respectively connected to the dc positive electrode and the dc negative electrode of the second rectifying circuit 41, in this embodiment, the energy storage capacitor C1 is a polar capacitor, and charges the energy storage capacitor C1 as a source of the auxiliary pilot arc voltage J4; and the auxiliary pilot arc voltage control module is connected with the energy storage capacitor C1 and is used for controlling the generation and output of the auxiliary pilot arc voltage J4.
Further, as shown in fig. 2 and 3, the auxiliary pilot arc voltage control module includes: the PWM modulation chip U1, the third IGBT431, the output inductor L, the feedback resistor R3, the chip turn-on circuit 435, and the fourth IGBT432 and the fifth IGBT433 which are connected in series.
As shown in fig. 3, the PWM modulation chip U1 is configured to output a PWM wave, in this embodiment, the PWM modulation chip U1 is a peak current type PWM modulation chip UC3843, and a peripheral circuit thereof is provided with a current sampling resistor R1, an oscillation resistor R2, and an oscillation capacitor C2. The current sampling resistor R1 converts the sampled current into a voltage signal, the voltage signal is input to an ISNS pin of the UC3843 chip through a resistor capacitor connected in series, the voltage of the ISNS pin is 1V at most, and if the voltage is higher than 1V, the PWM duty cycle output of the output end of the UC3843 chip is limited, so that the current in the current sampling resistor R1 is basically constant current, namely 1V/R1; parameters of the oscillating resistor R2 and the oscillating capacitor C2 determine the frequency of the PWM wave output by the output end of the UC3843 chip.
As shown in fig. 2 and 3, the gate of the third IGBT431 is connected to the output terminal of the PWM modulation chip U1, and the PWM wave drives the third IGBT431 to operate; one end of the output inductor L is connected to the collector of the third IGBT 431; an emitter of the fourth IGBT432 is connected to a collector of the fifth IGBT433 for outputting an ac auxiliary pilot voltage J4, a collector of the fourth IGBT432 is connected to a dc positive electrode of the second rectifying circuit 41, and an emitter of the fifth IGBT433 is connected to the other end J2 of the output inductor L; two ends of the feedback resistor R3 are respectively connected with a voltage feedback pin VFB and a reference voltage pin VREF of the PWM modulation chip U1; the input end of the chip turn-on circuit 435 is connected to an external signal J5, and the output end is connected to a voltage feedback pin VFB of the PWM modulation chip U1, for turning on the PWM modulation chip U1 to output a PWM wave.
Further, as shown in fig. 3, the chip turn-on circuit 435 includes: a voltage divider circuit 4351 and an optical coupler U2. Wherein, the input end of the voltage division circuit 4351 is connected with an external signal J5; an input end U2A of the optical coupler U2 is connected with an output end of the voltage division circuit 4351, and an output end U2B of the optical coupler U2 is connected with a voltage feedback pin VFB of the PWM modulation chip U1.
Further, in this embodiment, as shown in fig. 3, the auxiliary pilot arc module 4 further includes: the filter capacitor C3 and the filter capacitor C3 are connected in parallel with the energy storage capacitor C1.
Further, as shown in fig. 3, the auxiliary pilot arc voltage control module further includes: a first protection diode D1, a second protection diode D2 for protecting the fourth IGBT432 and the fifth IGBT 433; the anode of the first protection diode D1 is connected to the collector of the fourth IGBT432, and the cathode is connected to the dc positive electrode of the first rectifying circuit 31; the cathode of the second protection diode D2 is connected to the emitter of the fifth IGBT433, and the anode is connected to the dc negative terminal of the first rectifying circuit 31.
Further, as shown in fig. 3, the auxiliary pilot arc voltage control module further includes: and an anode of the third protection diode D3, and a cathode of the third protection diode D3 are connected to a collector of the third IGBT431 and a cathode of the third protection diode D8932 are connected to a dc positive electrode of the second rectifying circuit 41, and are used for protecting the third IGBT 431.
When in operation, the ac main pilot arc voltage J3 is generated by controlling the conductive closure of the first IGBT32 and the second IGBT33, and the auxiliary pilot arc voltage J4 output by the output inductor L is controlled by the conductive closure of the fourth IGBT432 and the fifth IGBT433 to generate the ac auxiliary pilot arc voltage J4. Further, in this embodiment, the voltage of the reference voltage pin VREF of the UC3843 chip is the reference voltage, which has a value of 5V, is connected to a reference voltage pin VREF and a voltage feedback pin VFB through a feedback resistor R3, thereby pulling up the voltage of the VFB pin to 5V, closing the PWM output of the UC3843 chip, during the current commutation process of AC/DC argon arc welding, an external signal J5 divides the voltage through a voltage division circuit 4351 to turn on an optical coupler U2, thereby pulling down the VFB level of the voltage feedback pin of the UC3843 chip, turning on the PWM drive of the UC3843 chip, driving the third IGBT431 to operate through the driving resistor R4, namely, when the current crosses zero, the optocoupler U2 is switched on to enable the UC3843 chip to work, the auxiliary pilot arc voltage J4 is given, so as to maintain the arc when the current passes zero to be continuous, therefore, the arc interruption when the current passes through zero can be realized only by adopting a single PWM (pulse-width modulation) chip, the structure is simpler, and the cost is lower.
The arc maintaining circuit of the alternating current-direct current argon arc welding machine according to the embodiment of the utility model is described above with reference to fig. 1 to 3, only a single PWM modulation chip is needed, the structure is simpler, and the cost is lower.
It should be noted that, in the present specification, 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the utility model. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the utility model should be determined from the following claims.
Claims (9)
1. The utility model provides an alternating current-direct current argon arc welding machine dimension arc circuit which characterized in that contains:
a full-bridge inverter circuit for inverting an input direct current voltage into a square wave voltage;
the primary side of the transformer is connected with the output end of the full-bridge inverter circuit, and the secondary side of the transformer is provided with a center tap;
the main pilot arc module is connected with the secondary side of the transformer and used for generating and outputting main pilot arc voltage;
and the auxiliary pilot arc module is connected with a center tap of the transformer and is used for generating and outputting an auxiliary pilot arc voltage.
2. The pilot arc circuit for an ac-dc argon arc welding machine according to claim 1, wherein said main pilot arc module comprises:
the input end of the first rectifying circuit is connected with the secondary side of the transformer and used for rectifying the square wave voltage output by the secondary side of the transformer into direct current voltage;
the direct current power supply circuit comprises a first IGBT and a second IGBT which are connected in series, wherein an emitting electrode of the first IGBT is connected with a collecting electrode of the second IGBT and used for outputting alternating current main maintaining arc voltage, a collecting electrode of the first IGBT is connected with a direct current positive electrode of a first rectifying circuit, and an emitting electrode of the second IGBT is connected with a direct current negative electrode of the first rectifying circuit.
3. The pilot arc circuit for the AC-DC argon arc welding machine according to claim 2, wherein the auxiliary pilot arc module comprises:
the input end of the second rectifying circuit is connected with a center tap of the transformer and is used for rectifying the square wave voltage output by the secondary side of the transformer into direct current voltage;
the two ends of the energy storage capacitor are respectively connected with the direct current positive electrode and the direct current negative electrode of the second rectifying circuit;
and the auxiliary pilot arc voltage control module is connected with the energy storage capacitor and is used for controlling the generation and the output of the auxiliary pilot arc voltage.
4. The pilot arc circuit for the AC-DC argon arc welding machine according to claim 3, wherein the energy storage capacitor is a polar capacitor.
5. The pilot arc circuit for the AC-DC argon arc welding machine according to claim 3, wherein the auxiliary pilot arc module further comprises:
and the filter capacitor is connected with the energy storage capacitor in parallel.
6. The pilot arc circuit for AC-DC argon arc welding machine according to claim 3, wherein said auxiliary pilot arc voltage control module comprises:
the PWM modulation chip is used for outputting PWM waves;
a grid electrode of the third IGBT is connected with the output end of the PWM modulation chip, and the PWM wave drives the third IGBT to work;
one end of the output inductor is connected with the collector electrode of the third IGBT;
the emitter of the fourth IGBT is connected with the collector of the fifth IGBT in series and used for outputting alternating current auxiliary pilot arc voltage, the collector of the fourth IGBT is connected with the direct current positive electrode of the second rectifying circuit, and the emitter of the fifth IGBT is connected with the other end of the output inductor;
the two ends of the feedback resistor are respectively connected with a voltage feedback pin and a reference voltage pin of the PWM modulation chip;
and the input end of the chip opening circuit is connected with an external signal, and the output end of the chip opening circuit is connected with a voltage feedback pin of the PWM modulation chip and is used for opening the PWM modulation chip to output PWM waves.
7. The pilot arc circuit for AC-DC argon arc welding machine according to claim 6, wherein said auxiliary pilot arc voltage control module further comprises: a first protection diode and a second protection diode; the anode of the first protection diode is connected with the collector of the fourth IGBT, and the cathode of the first protection diode is connected with the direct-current positive electrode of the first rectifying circuit; and the cathode of the second protection diode is connected with the emitter of the fifth IGBT, and the anode of the second protection diode is connected with the direct current cathode of the first rectifying circuit.
8. The pilot arc circuit for AC-DC argon arc welding machine according to claim 6, wherein said auxiliary pilot arc voltage control module further comprises: and the anode of the third protection diode is connected with the collector of the third IGBT, and the cathode of the third protection diode is connected with the direct-current anode of the second rectifying circuit.
9. The pilot arc circuit for AC/DC argon arc welding machine according to claim 6, wherein said chip turn-on circuit comprises:
the input end of the voltage division circuit is connected with an external signal;
and the input end of the optical coupler is connected with the output end of the voltage division circuit, and the output end of the optical coupler is connected with a voltage feedback pin of the PWM modulation chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120858166.2U CN215393069U (en) | 2021-04-25 | 2021-04-25 | Pilot arc circuit for AC/DC argon arc welding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120858166.2U CN215393069U (en) | 2021-04-25 | 2021-04-25 | Pilot arc circuit for AC/DC argon arc welding machine |
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| Publication Number | Publication Date |
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| CN215393069U true CN215393069U (en) | 2022-01-04 |
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| CN202120858166.2U Active CN215393069U (en) | 2021-04-25 | 2021-04-25 | Pilot arc circuit for AC/DC argon arc welding machine |
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| CN (1) | CN215393069U (en) |
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- 2021-04-25 CN CN202120858166.2U patent/CN215393069U/en active Active
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