CN213185486U - Phase-loss protection circuit for high-power arc welding power supply - Google Patents
Phase-loss protection circuit for high-power arc welding power supply Download PDFInfo
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- CN213185486U CN213185486U CN202022142744.0U CN202022142744U CN213185486U CN 213185486 U CN213185486 U CN 213185486U CN 202022142744 U CN202022142744 U CN 202022142744U CN 213185486 U CN213185486 U CN 213185486U
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Abstract
The utility model discloses a phase-lack protection circuit for a high-power arc welding power supply, which comprises an arc welding power supply circuit unit, a main board control circuit unit and a PWM control circuit unit; the method can be used for controlling the open-phase detection of the three-phase circuit and protecting the main circuit device of the arc welding power supply from being damaged due to the open-phase; compared with the traditional similar product principle, the circuit is simple and easy to realize, the possibility of error detection of the control circuit is greatly reduced, the production efficiency and the product quality can be effectively improved, and the management cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of electromechanical technique and specifically relates to a short term protection circuit for high-power arc-welding power supply is related to.
Background
The arc welding power source is a special device for providing electric energy for arc welding, and the load is an electric arc and has the characteristic of large output current. Domestic inverter arc welding power supply products generally supply power by three phases of 380V. The input 380V three-phase alternating current is rectified to be high-voltage direct current about 520V, the high-voltage direct current is converted into high-frequency alternating current through an inverter, and the high-frequency alternating current is converted into smooth direct current for welding after voltage reduction and rectification filtering of a transformer.
If the welding power supply has no open-phase protection function, the power supply works when a three-phase 380V power grid has open-phase faults, and filter capacitors, IGBT modules and other electronic components inside the power supply are damaged.
The open-phase protection circuit used by the existing arc welding power supply needs to use three step-down impedances and three optical couplers to detect a three-phase power supply, then synthesizes three optical coupler detection output signals into a total switch output signal, and detects the signal to judge whether the three-phase power supply is open-phase or not, and the circuit design is complex; when the arc welding power supply works under a phase-lacking circuit, the rectified input and the filter current in the main circuit device of the power supply are increased, so that the main circuit device is damaged; therefore, when the three-phase power supply is out of phase, the output of the arc welding power supply is timely cut off to protect main circuit devices.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a three-phase electricity lacks looks protection circuit, it can be in time arc welding power-off when the three-phase electricity that supplies power to the arc welding power supply lacks looks to protection arc welding power supply main circuit device does not damage because of lacking the looks. The utility model discloses a following technical scheme realizes:
a phase-loss protection circuit for a high-power arc welding power supply, comprising: the arc welding power supply circuit unit, the main board control circuit unit and the PWM control circuit unit also comprise a control transformer unit, wherein the input end of the control transformer unit is connected with a three-phase power supply, and the control transformer unit comprises a control transformer 1 and a control transformer 2; the control transformer 1 independently supplies power to the PWM control circuit unit; the control transformer 2 independently supplies power to the mainboard control circuit unit; when the PWM control circuit unit and the main board control circuit unit supply power to work simultaneously, the arc welding power supply circuit unit works normally, and the arc welding power supply outputs normally; the output end of the PWM control circuit unit controls the arc welding power supply circuit unit, the output end of the arc welding power supply circuit unit is fed back to the main board control circuit unit, and the PWM control circuit unit responds to the main board control circuit unit; under the phase-lacking state, the device of the arc welding power supply main circuit is protected, and the reliability of the product can be effectively improved.
Further, one end of a primary side winding of the control transformer 1 is connected with a U phase of a three-phase power supply, and the other end of the primary side winding is connected with a V phase of the three-phase power supply; the secondary side winding of the control transformer 1 supplies power to the PWM control circuit unit; one end of a primary side winding of the control transformer 2 is connected with a W phase of a three-phase power supply, and the other end of the primary side winding of the control transformer is connected with a V phase of the three-phase power supply; and the secondary winding of the control transformer 2 supplies power to the mainboard control circuit unit.
Based on the structure, when the three-phase incoming line of the arc welding power supply is out of phase, if the U-th phase is out of phase, the PWM control circuit of the arc welding power supply cannot normally supply power, and the arc welding power supply does not output power; if the V-th phase is not available, the arc welding power supply PWM control circuit and the main board control circuit can not normally supply power, and the arc welding power supply does not output power; if the W-th phase is not available, the arc welding power supply main board control circuit cannot normally supply power, and the arc welding power supply has no output and can be applied to the control of the phase-lacking detection of the three-phase circuit.
Further, the arc welding power supply circuit unit includes an input rectifier, a filter, an inverter, a transformer, an output rectifier, and an output filter; the input end of the input rectifier is connected with the AC, the output end of the input rectifier is connected with the input end of the filter, the output end of the filter is connected with the voltage input port of the inverter, the voltage output port of the inverter is connected with the primary winding of the transformer, and the secondary winding of the transformer is connected with the input port of the output rectifier; the output circuit of the output rectifier is connected with an arc welding power supply through an output filter, the rectifier has the function of converting alternating current into direct current, and the inverter is high in conversion efficiency and good in safety performance.
Further, the PWM control circuit unit includes a PWM control power supplier and a PWM controller; the output end of the PWM control power supply is connected with the power supply end of the PWM controller; the output end of the PWM controller controls an inverter in the arc welding power circuit unit.
Further, the main board control circuit unit comprises a main board control power supply and a PI device, the output end of the main board control power supply is connected with the power supply port of the PI device, the feedback current of the output loop of the arc welding power supply circuit unit flows into the input feedback signal port of the PI device, and the PWM controller in the PWM control circuit unit responds to the output signal of the output signal port of the PI device.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the whole phase-lack control circuit consists of two control transformers with independent functions; the two control transformers with independent functions respectively supply power to the PWM control circuit unit and the mainboard control circuit unit independently; the arc welding power supply circuit unit normally works only when the PWM control circuit unit and the main board control circuit unit supply power simultaneously; the method can be used for controlling the open-phase detection of the three-phase circuit and protecting the devices in the arc welding power supply circuit unit from being damaged due to the open-phase; compared with the traditional similar product principle, the circuit is simple and easy to realize, the possibility of error detection of the control circuit is greatly reduced, the production efficiency and the product quality can be effectively improved, and the management cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of the circuit structure of the present invention
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Referring to fig. 1, one end of the primary winding of the control transformer 1 is connected to the U-phase of the three-phase power, and the other end of the primary winding is connected to the V-phase of the three-phase power; the secondary side winding of the control transformer 1 supplies power to the PWM control circuit unit; one end of a primary side winding of the control transformer 2 is connected with a W phase of a three-phase power supply, and the other end of the primary side winding of the control transformer is connected with a V phase of the three-phase power supply; and the secondary winding of the control transformer 2 supplies power to the mainboard control circuit unit.
Furthermore, one end of a primary side winding coil of the control transformer 1 is connected with a U phase of a three-phase power supply, the other end of the primary side winding coil of the control transformer 1 is connected with a V phase of the three-phase power supply, two ends of a secondary side winding coil of the control transformer 1 are respectively connected with a PWM control power supply, the reduced alternating current voltage is supplied to the PWM control power supply, a rectifier in the PWM control power supply converts alternating current of the three-phase power supply into direct current, and the direct current is converted by the PWM control power supply and flows into the PWM controller;
further, when the three-phase incoming line of the arc welding power supply is out of phase and the three-phase incoming line of the arc welding power supply is out of U phase, the primary side coil of the transformer 1 is controlled to be in an open circuit state, no voltage signal flows through the inverter through the control transformer 1, the PWM control power supply and the PWM controller, the arc welding power supply PMW control circuit unit cannot normally supply power, and the arc welding power supply does not output power.
Furthermore, one end of a coil of a primary side winding of the control transformer 2 is connected with a W phase of a three-phase power supply, the other end of the coil of the primary side winding is connected with a V phase of the three-phase power supply, the secondary side winding of the control transformer 2 is provided with two independent coils, wherein the two coils have different numbers of turns and can realize the switching of high voltage and low voltage, the two coils are respectively connected with a rectifier with different parameters in a mainboard control power supply, the rectifier converts alternating current of the three-phase power supply into direct current, and the direct current is supplied to a PI device;
further, when the three-phase incoming line of the arc welding power supply lacks a W phase, the primary side coil of the transformer 2 is controlled to be in an open circuit state, the main board controls the power supply device to have no current, the PI device controls the power supply device to have no voltage signal flowing through the main board, the arc welding power supply main board control circuit unit cannot normally supply power, and the arc welding power supply does not output power.
Further, when the three-phase incoming line of the arc welding power supply lacks a V phase, a primary side coil of the transformer 1 is controlled to be in an open circuit state, no voltage signal flows through the inverter through the control transformer 1, the PWM control power supply device and the PWM controller, and the PWM control circuit unit cannot normally supply power; the primary side coil of the control transformer 2 is in an open circuit state, the mainboard controls the power supply device to have no current, the PI device controls the power supply device to have no voltage signal flowing through the mainboard, the mainboard control circuit unit cannot normally supply power, and the arc welding power supply has no output.
It can be understood that when the three-phase incoming line of the arc welding power supply is in a phase failure state, if the U-th phase is not in the state, the PWM control circuit unit cannot normally supply power, and the arc welding power supply does not output power; if the V-th phase is not available, the PWM control circuit unit and the main board control circuit unit can not normally supply power, and the arc welding power supply has no output; if the W-th phase is not available, the main board control circuit unit cannot normally supply power, the arc welding power supply has no output, the arc welding power supply can be applied to the control of the open-phase detection of the three-phase circuit, and the devices of the arc welding power supply circuit unit are protected under the open-phase state, so that the reliability of the products can be effectively improved.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A phase-loss protection circuit for a high-power arc welding power supply, comprising: the arc welding power supply circuit unit, the main board control circuit unit and the PWM control circuit unit are characterized by further comprising a control transformer unit, wherein the input end of the control transformer unit is connected with a three-phase power supply, and the control transformer unit comprises a control transformer 1 and a control transformer 2; the control transformer 1 independently supplies power to the PWM control circuit unit; the control transformer 2 independently supplies power to the mainboard control circuit unit; when the PWM control circuit unit and the main board control circuit unit supply power to work simultaneously, the arc welding power supply circuit unit works normally, and the arc welding power supply outputs normally;
the output end of the PWM control circuit unit controls the arc welding power supply circuit unit, the output end of the arc welding power supply circuit unit is fed back to the main board control circuit unit, and the PWM control circuit unit responds to the main board control circuit unit.
2. The open-phase protection circuit for high-power arc welding power supply according to claim 1, characterized in that one end of the primary side winding of the control transformer 1 is connected with the U phase of the three-phase power supply, and the other end of the primary side winding is connected with the V phase of the three-phase power supply; the secondary side winding of the control transformer 1 supplies power to the PWM control circuit unit; one end of a primary side winding of the control transformer 2 is connected with a W phase of a three-phase power supply, and the other end of the primary side winding of the control transformer is connected with a V phase of the three-phase power supply; and the secondary winding of the control transformer 2 supplies power to the mainboard control circuit unit.
3. The open-phase protection circuit for high-power arc welding power supply according to claim 1, wherein the arc welding power supply circuit unit comprises an input rectifier, a filter, an inverter, a transformer, an output rectifier and an output filter; the input end of the input rectifier is connected with the AC, the output end of the input rectifier is connected with the input end of the filter, the output end of the filter is connected with the voltage input port of the inverter, the voltage output port of the inverter is connected with the primary winding of the transformer, and the secondary winding of the transformer is connected with the input port of the output rectifier; and an output loop of the output rectifier is connected with an arc welding power supply through an output filter.
4. The open-phase protection circuit for high-power arc welding power supply according to claim 3, characterized in that the PWM control circuit unit comprises a PWM control power supply and a PWM controller; the output end of the PWM control power supply is connected with the power supply end of the PWM controller; the output end of the PWM controller controls an inverter in the arc welding power circuit unit.
5. The open-phase protection circuit for high-power arc welding power supply according to claim 4, characterized in that the main board control circuit unit comprises a main board control power supply and a PI device, the output end of the main board control power supply is connected with the power supply port of the PI device, the feedback current of the output loop of the arc welding power supply circuit unit flows into the input feedback signal port of the PI device, and the PWM controller in the PWM control circuit unit responds to the output signal of the output signal port of the PI device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022142744.0U CN213185486U (en) | 2020-09-25 | 2020-09-25 | Phase-loss protection circuit for high-power arc welding power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022142744.0U CN213185486U (en) | 2020-09-25 | 2020-09-25 | Phase-loss protection circuit for high-power arc welding power supply |
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| Publication Number | Publication Date |
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| CN213185486U true CN213185486U (en) | 2021-05-11 |
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| CN202022142744.0U Active CN213185486U (en) | 2020-09-25 | 2020-09-25 | Phase-loss protection circuit for high-power arc welding power supply |
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| CN (1) | CN213185486U (en) |
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- 2020-09-25 CN CN202022142744.0U patent/CN213185486U/en active Active
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