CN211804323U - Control circuit of welding main loop and welding main loop - Google Patents
Control circuit of welding main loop and welding main loop Download PDFInfo
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- CN211804323U CN211804323U CN202020367687.3U CN202020367687U CN211804323U CN 211804323 U CN211804323 U CN 211804323U CN 202020367687 U CN202020367687 U CN 202020367687U CN 211804323 U CN211804323 U CN 211804323U
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Abstract
The application provides a control circuit of a welding main loop and the welding main loop, wherein the control circuit of the welding main loop comprises a voltage acquisition circuit, a comparison circuit, a processor and a turn ratio switching circuit; the input end of the voltage acquisition circuit is used for being connected with the output end of the primary rectification circuit, and the output end of the voltage acquisition circuit is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the processor; the input end of the turn ratio switching circuit is connected with the processor, and the output end of the turn ratio switching circuit is connected with the main transformer. The voltage acquisition circuit acquires a voltage signal after the primary rectification circuit and transmits the voltage signal to the comparison circuit. The comparison circuit compares the voltage signal with a reference voltage and outputs a corresponding level signal to the processor. The processor outputs corresponding switching signals to the turn ratio switching circuit for switching the turn ratio of the main transformer, thereby meeting the output requirements at different input voltages and maintaining the output stability.
Description
Technical Field
The application relates to the technical field of welding, in particular to a control circuit of a welding main loop and the welding main loop.
Background
Welding is an indispensable link in industry, and the voltage of the power supply of welding equipment is generally determined according to the model of the equipment and cannot be changed, and generally, a welding main loop generally comprises a primary rectifying circuit, an inverter circuit, a main transformer and a secondary rectifying circuit which are connected in sequence. If the power supply is not matched with the main loop in the welding equipment, the welding equipment cannot normally work.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the traditional welding main circuit can only be input by a single power supply, and the adaptability of a power grid is poor.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a control circuit for a welding main circuit and a welding main circuit having high grid adaptability.
In order to achieve the above object, in one aspect, the embodiment of the present invention provides a control circuit of a welding main loop and a welding main loop, including a voltage acquisition circuit, a comparison circuit, a processor and a turn ratio switching circuit;
the input end of the voltage acquisition circuit is used for being connected with the output end of the primary rectification circuit, and the output end of the voltage acquisition circuit is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the processor; the input end of the turn ratio switching circuit is connected with the processor, and the output end of the turn ratio switching circuit is connected with the main transformer.
In one embodiment, the system further comprises a first protection circuit;
the first protection circuit is used for disconnecting the primary rectifying circuit from the mains supply according to the control signal output by the processor.
In one embodiment, the first protection circuit comprises an output current sampling circuit, an output voltage sampling circuit, a MOS tube Q1 and a relay CR 1;
the output current sampling circuit is used for collecting an output current signal of the welding main loop and transmitting the output current signal to the processor; the output voltage sampling circuit is used for collecting an output voltage signal of the welding main loop and transmitting the output voltage signal to the processor;
the grid electrode of the MOS tube Q1 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR1, and the source electrode is grounded; the other end of the coil of the relay CR1 is connected with a first external power supply;
the first contact of the relay CR1 is used for connecting the input end of the primary rectifying circuit, and the second contact is used for connecting the commercial power.
In one embodiment, the first protection circuit further comprises an optocoupler IC 1;
the optical coupler IC1 includes a light emitting side and a light receiving side; the positive pole of the light-emitting side is connected with the processor, and the negative pole is grounded; the emitter at the light receiving side is connected with the grid of the MOS tube Q1, and the collector is connected with a second external power supply.
In one embodiment, the PWM controller further comprises a second protection circuit and a PWM chip;
the processor is connected with the PWM chip through a second protection circuit; the PWM chip is used for being connected with the inverter circuit.
In one embodiment, the second protection circuit includes a diode D1 and a resistor R1;
one end of the resistor R1 is connected with the processor, and the other end is connected with the anode of the diode D1; and the cathode of the diode D1 is connected with the shutdown pin of the PWM chip.
In one embodiment, the comparison circuit includes a first comparator and a second comparator;
the positive phase input end of the first comparator is connected with the output end of the primary rectifying circuit through the voltage acquisition circuit, the negative phase input end of the first comparator is used for connecting a third external power supply, and the output end of the first comparator is connected with the processor; the inverting input end of the second comparator is grounded through the voltage acquisition circuit, the non-inverting input end of the second comparator is connected with the third external power supply, and the output end of the second comparator is connected with the processor.
In one embodiment, the comparison circuit further comprises a resistor R2, a resistor R3, an optocoupler IC2 and an optocoupler IC 3;
the positive electrode of the light emitting side of the optical coupler IC2 is connected with a fourth external power supply, and the negative electrode of the light emitting side of the optical coupler IC2 is connected with the output end of the second comparator; the emitting electrode of the light receiving side of the optical coupler IC2 is grounded, and the collector electrode of the optical coupler IC2 is connected with one end of a resistor R2 and the processor respectively; the other end of the resistor R2 is used for connecting a fifth external power supply;
the positive electrode of the light-emitting side of the optical coupler IC3 is connected with a sixth external power supply, and the negative electrode of the light-emitting side of the optical coupler IC3 is connected with the output end of the first comparator; the emitting electrode of the light receiving side of the optical coupler IC3 is grounded, and the collector electrode of the optical coupler IC3 is connected with one end of a resistor R3 and the processor respectively; the other end of the resistor R2 is used for connecting a seventh external power supply.
In one embodiment, the turn ratio switching circuit comprises a MOS transistor Q2 and a relay CR 2;
the grid electrode of the MOS tube Q2 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR2, and the source electrode is grounded; the other end of the coil of the relay CR2 is connected with an external power supply;
the first contact of relay CR2 connects the first end of main transformer, and the second contact is connected the second end of main transformer, and the third contact is connected the third end of main transformer.
On the other hand, the embodiment of the utility model also provides a welding main loop, including the primary rectifier circuit, inverter circuit, main transformer and the secondary rectifier circuit that connect gradually;
the control circuit of the welding main loop is also included.
One of the above technical solutions has the following advantages and beneficial effects:
the application provides a control circuit of a welding main loop, which comprises a voltage acquisition circuit, a comparison circuit, a processor and a turn ratio switching circuit; the input end of the voltage acquisition circuit is used for being connected with the output end of the primary rectification circuit, and the output end of the voltage acquisition circuit is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the processor; the input end of the turn ratio switching circuit is connected with the processor, and the output end of the turn ratio switching circuit is connected with the main transformer. The welding main circuit generally includes a primary rectification circuit, an inverter circuit, a main transformer and a secondary rectification circuit, which are connected in sequence. The voltage acquisition circuit acquires a voltage signal after the primary rectification circuit and transmits the voltage signal to the comparison circuit. The comparison circuit compares the voltage signal with a reference voltage and outputs a corresponding level signal to the processor. The processor outputs corresponding switching signals to the turn ratio switching circuit for switching the turn ratio of the main transformer, so that the requirement of meeting output requirements at different input voltages (three-phase 380V, single-phase 220V and single-phase 380V) is met, and the output stability is maintained.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a first schematic block diagram of control circuitry for a welding primary circuit in one embodiment;
FIG. 2 is a second schematic block diagram of control circuitry for the welding primary circuit in one embodiment;
FIG. 3 is a first schematic block diagram of a first protection circuit in one embodiment;
FIG. 4 is a second schematic block diagram of a first protection circuit in one embodiment;
FIG. 5 is a third schematic block diagram of control circuitry for the weld primary loop in one embodiment;
FIG. 6 is a block diagram of a second protection circuit in one embodiment;
FIG. 7 is a block diagram of a turn ratio switching circuit in one embodiment;
fig. 8 is a block diagram showing a primary rectifier circuit in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "first end," "second end," "one end," "another end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment, as shown in fig. 1, there is provided a control circuit for a welding primary loop, comprising a voltage acquisition circuit 10, a comparison circuit 20, a processor 30, and a turn ratio switching circuit 40;
the input end of the voltage acquisition circuit 10 is used for connecting the output end of the primary rectification circuit, and the output end is connected with the input end of the comparison circuit 20; the output end of the comparison circuit 20 is connected with the processor 30; the input end of the turn ratio switching circuit 40 is connected with the processor 30, and the output end is used for connecting with a main transformer.
The welding main loop comprises a primary rectifying circuit, an inverter circuit, a main transformer and a secondary rectifying circuit which are connected in sequence. The voltage acquisition circuit may be any one of those in the art. The comparison circuit is used for comparing the voltage acquired by the voltage acquisition circuit with the reference voltage. It should be noted that the reference voltage may be set according to actual conditions, and in a specific example, the reference voltage is 2.5v, and a corresponding potential may be provided by an external voltage. The comparison circuit may be any one of those in the art. And the turn ratio switching circuit is used for switching the turn ratio of the main transformer according to the signal output by the processor. It should be noted that, it is a common technical means in the art that the processor receives the high/low level signal transmitted by the comparison circuit and outputs a corresponding level signal.
In one specific example, the control circuitry of the welding primary circuit further comprises a switching power supply. The switching power supply is used for supplying power to the processor, external auxiliary equipment and the like, so that the stability of power supply is ensured.
The application provides a control circuit of a welding main loop, which comprises a voltage acquisition circuit, a comparison circuit, a processor and a turn ratio switching circuit; the voltage acquisition circuit acquires a voltage signal after the primary rectification circuit and transmits the voltage signal to the comparison circuit. The comparison circuit compares the voltage signal with a reference voltage and outputs a corresponding level signal to the processor. The processor outputs corresponding switching signals to the turn ratio switching circuit for switching the turn ratio of the main transformer, so that the requirement of meeting output requirements at different input voltages (three-phase 380V, single-phase 220V and single-phase 380V) is met, and the output stability is maintained.
In one embodiment, as shown in fig. 2, a control circuit for a welding main loop is provided, which includes a voltage acquisition circuit 10, a comparison circuit 20, a processor 30, and a turn ratio switching circuit 40;
the input end of the voltage acquisition circuit 10 is used for connecting the output end of the primary rectification circuit, and the output end is connected with the input end of the comparison circuit 20; the output end of the comparison circuit 20 is connected with the processor 30; the input end of the turn ratio switching circuit 40 is connected with the processor 30, and the output end is used for connecting with a main transformer.
Further includes a first protection circuit 50;
the first protection circuit 50 is used for disconnecting the primary rectification circuit from the mains supply according to the control signal output by the processor.
The first protection circuit is used for disconnecting the connection between the primary rectification circuit and the mains supply, and can be disconnected in any form in the field. For example: the connection between the primary rectifying single circuit and the commercial power can be disconnected through the relay.
Specifically, when the processor monitors that the voltage is abnormal, the processor can control the power supply of the main loop to be disconnected, so that the protection effect is achieved.
In one embodiment, as shown in fig. 3, the first protection circuit includes an output current sampling circuit, an output voltage sampling circuit, a MOS transistor Q1 and a relay CR 1;
the output current sampling circuit is used for collecting an output current signal of the welding main loop and transmitting the output current signal to the processor; the output voltage sampling circuit is used for collecting an output voltage signal of the welding main loop and transmitting the output voltage signal to the processor;
the grid electrode of the MOS tube Q1 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR1, and the source electrode is grounded; the other end of the coil of the relay CR1 is connected with a first external power supply;
the first contact of the relay CR1 is used for connecting the input end of the primary rectifying circuit, and the second contact is used for connecting the commercial power.
Specifically, when the processor does not receive the abnormal electric signal, the processor outputs a high-level signal, so that the MOS transistor Q1 is switched on, a loop is formed between the first external power supply and the ground, and the relay CR1 is switched on, so that the first contact and the second contact are switched on, and the function of switching on is achieved. It should be noted that the abnormal electrical signal includes an abnormal voltage signal and an abnormal current signal, which are respectively collected by the output current sampling circuit and the output voltage sampling circuit and transmitted to the processor. In one particular example, the first and second contacts are normally open contacts. When the processor receives the abnormal electric signal, the processor outputs a low-level signal, so that the MOS tube Q1 is disconnected, the relay CR1 is disconnected, the first contact and the second contact are disconnected, and the primary rectifying circuit is disconnected with the mains supply.
In one embodiment, as shown in fig. 4, the first protection circuit includes an output current sampling circuit, an output voltage sampling circuit, a MOS transistor Q1 and a relay CR 1;
the output current sampling circuit is used for collecting an output current signal of the welding main loop and transmitting the output current signal to the processor; the output voltage sampling circuit is used for collecting an output voltage signal of the welding main loop and transmitting the output voltage signal to the processor;
the grid electrode of the MOS tube Q1 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR1, and the source electrode is grounded; the other end of the coil of the relay CR1 is connected with a first external power supply;
the first contact of the relay CR1 is used for connecting the input end of the primary rectifying circuit, and the second contact is used for connecting the commercial power.
The first protection circuit further comprises an optocoupler IC 1;
the optical coupler IC1 includes a light emitting side and a light receiving side; the positive pole of the light-emitting side is connected with the processor, and the negative pole is grounded; the emitter at the light receiving side is connected with the grid of the MOS tube Q1, and the collector is connected with a second external power supply.
Specifically, when the processor does not receive the abnormal electric signal, a high-level signal is output to the anode of the light emitting side of the optical coupler, so that the light receiving side of the optical coupler is conducted. And when the processor does not receive the abnormal electric signal, the processor outputs a low-level signal to the positive electrode of the light-emitting side of the optocoupler. The second external power supply provides a high level to the gate of the MOS transistor Q1, so that the MOS transistor Q1 is turned on. In a specific example, the optical coupler further comprises a resistor R10 and a capacitor C10, and an emitter of a light receiving side of the optical coupler is grounded through the capacitor C10 and the resistor R10.
The processor is isolated through the optical coupler, so that the purpose of protecting the processor is achieved.
In one embodiment, as shown in fig. 5, a control circuit for a welding main loop is provided, which includes a voltage acquisition circuit 10, a comparison circuit 20, a processor 30, and a turn ratio switching circuit 40;
the input end of the voltage acquisition circuit 10 is used for connecting the output end of the primary rectification circuit, and the output end is connected with the input end of the comparison circuit 20; the output end of the comparison circuit 20 is connected with the processor 30; the input end of the turn ratio switching circuit 40 is connected with the processor 30, and the output end is used for connecting with a main transformer.
Further includes a first protection circuit 50;
the first protection circuit 50 is used for disconnecting the primary rectification circuit from the mains supply according to the control signal output by the processor.
A second protection circuit 60 and a PWM chip 70;
the processor 30 is connected with the PWM chip 70 through the second protection circuit 60; the PWM chip 70 is used to connect to an inverter circuit.
Specifically, the PWM chip is used to connect to an inverter circuit, and further, the PWM chip is connected to an IGBT device of the inverter circuit through a MOS transistor. The processor is connected with the PWM chip through the second protection circuit, so that the PWM chip controls the inverter circuit to stop working.
In one embodiment, as shown in fig. 6, the second protection circuit includes a diode D1 and a resistor R1; one end of the resistor R1 is connected with the processor, and the other end is connected with the anode of the diode D1; and the cathode of the diode D1 is connected with the shutdown pin of the PWM chip.
In one embodiment, the comparison circuit includes a first comparator and a second comparator;
the positive phase input end of the first comparator is connected with the output end of the primary rectifying circuit through the voltage acquisition circuit, the negative phase input end of the first comparator is used for connecting a third external power supply, and the output end of the first comparator is connected with the processor; the inverting input end of the second comparator is grounded through the voltage acquisition circuit, the non-inverting input end of the second comparator is connected with the third external power supply, and the output end of the second comparator is connected with the processor.
Specifically, the voltage acquisition circuit is connected with the output end of the primary rectification circuit, and rectified DC 226.24-311 is generally input when AC150V-220V is input; rectified DC 367 at the input of AC 260V; when the AC270V is input, the rectified DC 381.8; when the AC is input at 380-440V, the rectified DC is 443-662V. The reference voltage is provided by a third external power supply. In a specific example, the voltage regulator further comprises a Tl431 voltage regulator tube, wherein the terminal k is connected with a third external power supply, the terminal a is grounded, and the terminal r is connected with the inverting input end of the first comparator. A controllable precise voltage-stabilizing source of a Tl431 voltage-stabilizing tube. Its output voltage can be arbitrarily set to any value ranging from Vref (2.5V) to 36V with two resistors.
The processor can judge the voltage of the welding main loop according to the electric signal transmitted by the first comparison circuit, so as to control the turn ratio switching circuit to switch the corresponding turn ratio.
In one embodiment, the comparison circuit further comprises a resistor R2, a resistor R3, an optocoupler IC2 and an optocoupler IC 3;
the positive electrode of the light emitting side of the optical coupler IC2 is connected with a fourth external power supply, and the negative electrode of the light emitting side of the optical coupler IC2 is connected with the output end of the second comparator; the emitting electrode of the light receiving side of the optical coupler IC2 is grounded, and the collector electrode of the optical coupler IC2 is connected with one end of a resistor R2 and the processor respectively; the other end of the resistor R2 is used for connecting a fifth external power supply;
the positive electrode of the light-emitting side of the optical coupler IC3 is connected with a sixth external power supply, and the negative electrode of the light-emitting side of the optical coupler IC3 is connected with the output end of the first comparator; the emitting electrode of the light receiving side of the optical coupler IC3 is grounded, and the collector electrode of the optical coupler IC3 is connected with one end of a resistor R3 and the processor respectively; the other end of the resistor R2 is used for connecting a seventh external power supply.
The electric signal is transmitted to the processor through the optical coupler, and the processor is prevented from being impacted by current.
In one embodiment, as shown in fig. 7, the turn-ratio switching circuit comprises a MOS transistor Q2 and a relay CR 2;
the grid electrode of the MOS tube Q2 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR2, and the source electrode is grounded; the other end of the coil of the relay CR2 is connected with an external power supply;
the first contact of relay CR2 connects the first end of main transformer, and the second contact is connected the second end of main transformer, and the third contact is connected the third end of main transformer.
Specifically, the processor outputs a corresponding electric signal to the grid of the MOS tube Q2, so that the MOS tube is controlled to be conducted, the connection between the external power supply and the ground is conducted, the relay works, and the turn ratio can be switched. Further, the turn ratio switching circuit further comprises a relay CR3 and an auxiliary external power supply. One end of the coil of the relay CR3 is connected with an auxiliary external power supply, and the other end is connected with the drain electrode of the MOS transistor Q2.
The first contact of relay CR3 connects the first end of main transformer, and the second contact is connected the second end of main transformer, and the third contact is connected the third end of main transformer.
Through setting up two relays, can switch the turn ratio more reliably, even under a relay damage's the condition, also can normally switch.
In one embodiment, a control circuit of a welding main loop and the welding main loop are provided, and comprise a voltage acquisition circuit, a comparison circuit, a processor and a turn ratio switching circuit;
the input end of the voltage acquisition circuit is used for being connected with the output end of the primary rectification circuit, and the output end of the voltage acquisition circuit is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the processor; the input end of the turn ratio switching circuit is connected with the processor, and the output end of the turn ratio switching circuit is connected with the main transformer.
The protection circuit also comprises a first protection circuit; the first protection circuit is used for disconnecting the primary rectifying circuit from the mains supply according to the control signal output by the processor. The first protection circuit comprises an output current sampling circuit, an output voltage sampling circuit, a MOS (metal oxide semiconductor) tube Q1 and a relay CR 1; the output current sampling circuit is used for collecting an output current signal of the welding main loop and transmitting the output current signal to the processor; the output voltage sampling circuit is used for collecting an output voltage signal of the welding main loop and transmitting the output voltage signal to the processor; the grid electrode of the MOS tube Q1 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR1, and the source electrode is grounded; the other end of the coil of the relay CR1 is connected with a first external power supply; the first contact of the relay CR1 is used for connecting the input end of the primary rectifying circuit, and the second contact is used for connecting the commercial power. The first protection circuit further comprises an optocoupler IC 1; the optical coupler IC1 includes a light emitting side and a light receiving side; the positive pole of the light-emitting side is connected with the processor, and the negative pole is grounded; the emitter at the light receiving side is connected with the grid of the MOS tube Q1, and the collector is connected with a second external power supply.
The PWM chip is connected with the first protection circuit; the processor is connected with the PWM chip through a second protection circuit; the PWM chip is used for being connected with the inverter circuit. The second protection circuit comprises a diode D1 and a resistor R1; one end of the resistor R1 is connected with the processor, and the other end is connected with the anode of the diode D1; and the cathode of the diode D1 is connected with the shutdown pin of the PWM chip.
The comparison circuit comprises a first comparator and a second comparator; the positive phase input end of the first comparator is connected with the output end of the primary rectifying circuit through the voltage acquisition circuit, the negative phase input end of the first comparator is used for connecting a third external power supply, and the output end of the first comparator is connected with the processor; the inverting input end of the second comparator is grounded through the voltage acquisition circuit, the non-inverting input end of the second comparator is connected with the third external power supply, and the output end of the second comparator is connected with the processor. The comparison circuit further comprises a resistor R2, a resistor R3, an optical coupler IC2 and an optical coupler IC 3; the positive electrode of the light emitting side of the optical coupler IC2 is connected with a fourth external power supply, and the negative electrode of the light emitting side of the optical coupler IC2 is connected with the output end of the second comparator; the emitting electrode of the light receiving side of the optical coupler IC2 is grounded, and the collector electrode of the optical coupler IC2 is connected with one end of a resistor R2 and the processor respectively; the other end of the resistor R2 is used for connecting a fifth external power supply; the positive electrode of the light-emitting side of the optical coupler IC3 is connected with a sixth external power supply, and the negative electrode of the light-emitting side of the optical coupler IC3 is connected with the output end of the first comparator; the emitting electrode of the light receiving side of the optical coupler IC3 is grounded, and the collector electrode of the optical coupler IC3 is connected with one end of a resistor R3 and the processor respectively; the other end of the resistor R2 is used for connecting a seventh external power supply.
The turn ratio switching circuit comprises a MOS tube Q2 and a relay CR 2; the grid electrode of the MOS tube Q2 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR2, and the source electrode is grounded; the other end of the coil of the relay CR2 is connected with an external power supply; the first contact of relay CR2 connects the first end of main transformer, and the second contact is connected the second end of main transformer, and the third contact is connected the third end of main transformer.
On the other hand, the embodiment of the utility model also provides a welding main loop, including the primary rectifier circuit, inverter circuit, main transformer and the secondary rectifier circuit that connect gradually;
the control circuit of the welding main loop is also included.
In a specific embodiment, the circuit structure of the primary rectification circuit can be as shown in fig. 8, and a single-phase/two-phase/three-phase AC150-440V power supply can be connected to any of AC1-AC3 in fig. 8 for rectification and filtering to generate direct current.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A control circuit of a welding main loop is characterized by comprising a voltage acquisition circuit, a comparison circuit, a processor and a turn ratio switching circuit;
the input end of the voltage acquisition circuit is used for being connected with the output end of the primary rectification circuit, and the output end of the voltage acquisition circuit is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the processor; and the input end of the turn ratio switching circuit is connected with the processor, and the output end of the turn ratio switching circuit is connected with the main transformer.
2. The control circuit of the welding primary loop of claim 1 further comprising a first protection circuit;
the first protection circuit is used for disconnecting the primary rectification circuit from the mains supply according to the control signal output by the processor.
3. The control circuit of the welding main loop of claim 2, wherein the first protection circuit comprises an output current sampling circuit, an output voltage sampling circuit, a MOS transistor Q1 and a relay CR 1;
the output current sampling circuit is used for collecting an output current signal of a welding main loop and transmitting the output current signal to the processor; the output voltage sampling circuit is used for collecting an output voltage signal of a welding main loop and transmitting the output voltage signal to the processor;
the grid electrode of the MOS tube Q1 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR1, and the source electrode is grounded; the other end of the coil of the relay CR1 is connected with a first external power supply;
and a first contact of the relay CR1 is used for connecting the input end of the primary rectifying circuit, and a second contact of the relay CR1 is used for connecting the commercial power.
4. The control circuit of the welding primary loop of claim 3 wherein said first protection circuit further comprises an optocoupler IC 1;
the optical coupler IC1 includes a light emitting side and a light receiving side; the positive electrode of the light emitting side is connected with the processor, and the negative electrode of the light emitting side is grounded; the emitter at the light receiving side is connected with the grid electrode of the MOS tube Q1, and the collector is connected with a second external power supply.
5. The control circuit of the welding main loop according to claim 1, further comprising a second protection circuit and a PWM chip;
the processor is connected with the PWM chip through the second protection circuit; and the PWM chip is used for connecting an inverter circuit.
6. The control circuit of the welding primary circuit of claim 5, wherein the second protection circuit comprises a diode D1 and a resistor R1;
one end of the resistor R1 is connected with the processor, and the other end of the resistor R1 is connected with the anode of the diode D1; and the cathode of the diode D1 is connected with the shutdown pin of the PWM chip.
7. The control circuit of the welding main loop of claim 1 wherein the comparison circuit comprises a first comparator and a second comparator;
the positive phase input end of the first comparator is connected with the output end of the primary rectifying circuit through the voltage acquisition circuit, the negative phase input end of the first comparator is used for being connected with a third external power supply, and the output end of the first comparator is connected with the processor; and the inverting input end of the second comparator is grounded through the voltage acquisition circuit, the non-inverting input end of the second comparator is connected with the third external power supply, and the output end of the second comparator is connected with the processor.
8. The control circuit of the welding main loop of claim 7, wherein the comparison circuit further comprises a resistor R2, a resistor R3, an optocoupler IC2, and an optocoupler IC 3;
the positive electrode of the light emitting side of the optical coupler IC2 is connected with a fourth external power supply, and the negative electrode of the light emitting side of the optical coupler IC2 is connected with the output end of the second comparator; the emitting stage of the light receiving side of the optical coupler IC2 is grounded, and the collector is respectively connected with one end of a resistor R2 and the processor; the other end of the resistor R2 is used for connecting a fifth external power supply;
the positive electrode of the light emitting side of the optical coupler IC3 is connected with a sixth external power supply, and the negative electrode of the light emitting side of the optical coupler IC3 is connected with the output end of the first comparator; the emitting stage of the light receiving side of the optical coupler IC3 is grounded, and the collector is respectively connected with one end of a resistor R3 and the processor; the other end of the resistor R2 is used for connecting a seventh external power supply.
9. The control circuit of the welding main loop of claim 1 wherein the turn-ratio switching circuit comprises a MOS transistor Q2 and a relay CR 2;
the grid electrode of the MOS tube Q2 is connected with the processor, the drain electrode is connected with one end of the coil of the relay CR2, and the source electrode is grounded; the other end of the coil of the relay CR2 is connected with an external power supply;
the first contact of the relay CR2 is connected with the first end of the main transformer, the second contact is connected with the second end of the main transformer, and the third contact is connected with the third end of the main transformer.
10. A main welding circuit is characterized by comprising a primary rectifying circuit, an inverter circuit, a main transformer and a secondary rectifying circuit which are connected in sequence;
further comprising control circuitry for the main welding circuit of any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020367687.3U CN211804323U (en) | 2020-03-20 | 2020-03-20 | Control circuit of welding main loop and welding main loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020367687.3U CN211804323U (en) | 2020-03-20 | 2020-03-20 | Control circuit of welding main loop and welding main loop |
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| Publication Number | Publication Date |
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| CN211804323U true CN211804323U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020367687.3U Active CN211804323U (en) | 2020-03-20 | 2020-03-20 | Control circuit of welding main loop and welding main loop |
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| CN (1) | CN211804323U (en) |
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