CN117359072B - Power supply safety protection circuit of spot welder - Google Patents
Power supply safety protection circuit of spot welder Download PDFInfo
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- CN117359072B CN117359072B CN202311647913.8A CN202311647913A CN117359072B CN 117359072 B CN117359072 B CN 117359072B CN 202311647913 A CN202311647913 A CN 202311647913A CN 117359072 B CN117359072 B CN 117359072B
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- 238000003466 welding Methods 0.000 claims abstract description 64
- 238000001514 detection method Methods 0.000 claims abstract description 52
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a power supply safety protection circuit of a spot welder, which relates to the technical field of power supply protection and comprises a power supply module for supplying power; the current detection protection module is used for power transmission and overcurrent detection and performs power-off protection when overcurrent occurs; the voltage transformation adjusting module is used for inversion adjustment, transformation and rectification; the intelligent control module is used for signal receiving and module control; the voltage superposition module is used for electric energy transmission and voltage superposition transmission and providing electric energy for the welding module; the voltage regulation module is used for regulating voltage and supplying power to the energy storage control module; the energy storage control module is used for storing energy and discharging; and the superposition adjusting module is used for providing pulse electric energy for the voltage superposition module. The power supply safety protection circuit of the spot welder detects the overcurrent of the voltage transformation adjusting module, when the overcurrent occurs, the voltage transformation adjusting module is disconnected, and the voltage superposition module performs superposition processing on the electric energy output by the voltage adjusting module and the superposition adjusting module and supplies power for the welding module.
Description
Technical Field
The invention relates to the technical field of power supply protection, in particular to a power supply safety protection circuit of a spot welder.
Background
The spot welder adopts the principle of double-sided double-point overcurrent welding, when in operation, two electrodes press a workpiece to enable two layers of metal to form certain contact resistance under the pressure of the two electrodes, and when welding current flows through the other electrode from one electrode, instantaneous heat welding is formed at the two contact resistance points, the existing spot welder mostly adopts a rectifying-inverting-rectifying mode to conduct electric energy treatment so as to provide pulsating direct current, and is matched with an overcurrent judging device to conduct overcurrent detection on welding working current so as to conduct power-off protection when overcurrent occurs, when the overcurrent condition occurs due to faults of the inverting device, certain influence is easily caused on surrounding normal components due to untimely protection, the working efficiency of the components is reduced, and after the power-off protection, the continuous operation of welding work cannot be ensured, and the welding working quality is reduced, so that improvement is needed.
Disclosure of Invention
The embodiment of the invention provides a power supply safety protection circuit of a spot welder, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a spot welder power safety protection circuit comprising: the device comprises a power supply module, a current detection protection module, a voltage conversion regulation module, an intelligent control module, a voltage superposition module, a welding module, a voltage regulation module, an energy storage control module and a superposition regulation module;
the power supply module is used for providing direct-current working electric energy;
the current detection protection module is connected with the power supply module and the voltage conversion regulation module and is used for transmitting the direct-current working electric energy provided by the power supply module to the voltage conversion regulation module, carrying out current detection and overcurrent judgment on the voltage conversion regulation module and outputting a first detection signal and stopping the transmission work of the electric energy when overcurrent occurs;
the voltage transformation adjusting module is connected with the intelligent control module and is used for receiving a first pulse signal output by the intelligent control module and performing inversion adjustment, isolation transformation and rectification on the input electric energy;
the intelligent control module is connected with the current detection protection module, the voltage regulation module, the energy storage control module, the superposition regulation module and the welding module, is used for outputting a first pulse signal, outputting a second pulse signal and controlling the electric energy regulation work of the voltage regulation module, outputting a charging signal and controlling the charging work of the energy storage control module, receiving the first detection signal and outputting a first control signal to control the electric energy transmission work of the voltage regulation module, outputting a third pulse signal and controlling the electric energy regulation work of the superposition regulation module, receiving the second detection signal output by the welding module and regulating the duty ratio of the first pulse signal and the second pulse signal, and receiving the third detection signal output by the superposition regulation module and regulating the duty ratio of the third pulse signal;
the voltage superposition module is connected with the voltage transformation adjusting module, the welding module, the voltage adjusting module and the superposition adjusting module, and is used for rectifying and filtering the electric energy output by the voltage transformation adjusting module and transmitting the electric energy to the welding module, and is used for superposing and rectifying the electric energy transmitted by the voltage adjusting module and the pulse electric energy output by the superposition adjusting module and transmitting the processed electric energy to the welding module;
the welding module is used for receiving the electric energy output by the voltage superposition module and performing welding work, detecting welding current and outputting a second detection signal;
the voltage regulating module is connected with the power supply module and is used for receiving a second pulse signal and carrying out voltage reduction regulation on the input electric energy, and the voltage regulating module is used for receiving a first control signal and transmitting the processed electric energy to the voltage superposition module;
the energy storage control module is connected with the voltage regulation module and the superposition regulation module and is used for receiving the charging signal and storing the electric energy output by the voltage regulation module and supplying power to the superposition regulation module;
and the superposition adjusting module is used for receiving the third pulse signal, performing isolation transformation on the electric energy released by the energy storage control module, and outputting pulse electric energy and transmitting the pulse electric energy to the voltage superposition module.
As still further aspects of the invention: the power module comprises a power processing device and a first capacitor; the current detection protection module comprises a first relay switch; the voltage conversion regulating module comprises a first inverter, a first transformer, a first diode and a second diode; the intelligent control module comprises a first controller;
preferably, the first end of the power supply processing device is connected with the first end of the first relay switch and is connected with the second end of the power supply processing device and the ground end through the first capacitor, the second end of the first relay switch is connected with the first input end of the first inverter, the second input end of the first inverter is connected with the current detection protection module, the first output end and the second output end of the first inverter are respectively connected with the first end and the second end of the primary side of the first transformer, the control end of the first inverter is connected with the IO2 end of the first controller, the first end and the second end of the secondary side of the first transformer are respectively connected with the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected with the cathode of the second diode, and the third end of the secondary side of the first transformer is grounded.
As still further aspects of the invention: the voltage superposition module comprises a third diode, a second transformer, a fourth diode and a second capacitor; the welding module comprises a welding device and a first resistor;
preferably, the anode of the third diode is connected with the cathode of the first diode, the cathode of the third diode is connected with the first end of the secondary side of the second transformer, the second end of the secondary side of the second transformer is connected with the anode of the fourth diode, the cathode of the fourth diode is connected with the first end of the welding machine device and is grounded through the second capacitor, the first end and the second end of the primary side of the second transformer are connected with the superposition adjusting module, and the second end of the welding device is connected with the IO4 end of the first controller and is grounded through the first resistor.
As still further aspects of the invention: the current detection protection module further comprises a second resistor, a seventh diode, a third capacitor, a signal processing device, a first comparator, a first threshold device and a third resistor;
preferably, the anode of the seventh diode is connected to the second input end of the first inverter and grounded through the second resistor, the cathode of the seventh diode is connected to the input end of the signal processing device and grounded through the third capacitor, the ground of the signal processing device is grounded, the output end of the signal processing device is connected to the in-phase end of the first comparator, the inverting end of the first comparator is connected to the first threshold device, and the output end of the first comparator is connected to the IO3 end of the first controller through the third resistor.
As still further aspects of the invention: the current detection protection module further comprises a first switch tube, a first relay and a first power supply;
preferably, the base electrode of the first switching tube is connected with the output end of the first comparator, the emitter electrode of the first comparator is grounded, the collector electrode of the first comparator is connected with one end of the first relay, and the other end of the first relay is connected with the first power supply.
As still further aspects of the invention: the voltage regulating module comprises a voltage regulating device, a second power tube and a sixth diode;
preferably, the first input end and the second input end of the voltage regulating device are respectively connected with the first end and the ground end of the power supply processing device, the control end of the voltage regulating device is connected with the IO1 end of the first controller, the first output end of the voltage regulating device is connected with the energy storage control module and the drain electrode of the second power tube, the second output end of the voltage regulating device is grounded, the source electrode of the second power tube is connected with the anode of the sixth diode, the cathode of the sixth diode is connected with the cathode of the first diode, and the grid electrode of the second power tube is connected with the IO5 end of the first controller.
As still further aspects of the invention: the energy storage control module comprises a first power tube, a fifth diode and an energy storage device;
preferably, the drain electrode of the first power tube is connected with the first output end of the voltage regulating device, the source electrode of the first power tube is connected with the anode of the fifth diode, the cathode of the fifth diode is connected with the first end of the energy storage device, the grid electrode of the first power tube is connected with the IO6 end of the first controller, and the second end of the energy storage device is grounded.
As still further aspects of the invention: the superposition adjusting module comprises a fourth capacitor, a fourth resistor, a third transformer, a third power tube, a fifth resistor and a fifth capacitor;
preferably, the first end of the primary side of the third transformer is connected with one end of the fourth capacitor and the first end of the energy storage device through the fourth resistor, the second end of the primary side of the third transformer is connected with the drain electrode of the third power tube, the source electrode of the third power tube is connected with the IO8 end of the first controller and grounded through the fifth resistor, the other end of the fourth capacitor is grounded, the first end of the secondary side of the third transformer is connected with the first end of the primary side of the second transformer through the fifth resistor, the second end of the secondary side of the third transformer is connected with the second end of the primary side of the second transformer, and the grid electrode of the third power tube is connected with the IO7 end of the first controller.
Compared with the prior art, the invention has the beneficial effects that: the intelligent control module controls the voltage conversion regulating module to carry out power regulation and electric energy conversion treatment so as to provide welding electric energy for the welding module, the current detection protecting module carries out overcurrent detection on the voltage conversion regulating module, the voltage conversion regulating module is disconnected when in overcurrent, the intelligent control module is triggered to control the superposition regulating module to regulate the electric energy stored by the energy storage control module, the voltage regulating module is controlled to carry out voltage regulation, and the voltage superposition module carries out superposition treatment on the voltage so as to meet the welding work of the welding module, and ensure the electric energy requirement of the welding module while improving the welding power supply safety.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a power supply safety protection circuit of a spot welder according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a power supply safety protection circuit of a spot welder provided by the embodiment of the invention.
Fig. 3 is a circuit diagram of a connection of a current detection protection module according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a connection of a superposition adjusting module according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In one embodiment, referring to fig. 1, a spot welder power safety protection circuit includes: the system comprises a power supply module 1, a current detection protection module 2, a voltage transformation regulation module 3, an intelligent control module 4, a voltage superposition module 5, a welding module 6, a voltage regulation module 7, an energy storage control module 8 and a superposition regulation module 9;
specifically, the power module 1 is used for providing direct-current working electric energy;
the current detection protection module 2 is connected with the power supply module 1 and the voltage conversion regulation module 3, and is used for transmitting direct-current working electric energy provided by the power supply module 1 to the voltage conversion regulation module 3, carrying out current detection and overcurrent judgment on the voltage conversion regulation module 3, and outputting a first detection signal and stopping electric energy transmission work when overcurrent occurs;
the voltage transformation adjusting module 3 is connected with the intelligent control module 4 and is used for receiving a first pulse signal output by the intelligent control module 4 and performing inversion adjustment, isolation transformation and rectification treatment on the input electric energy;
the intelligent control module 4 is connected with the current detection protection module 2, the voltage regulation module 7, the energy storage control module 8, the superposition regulation module 9 and the welding module 6, and is used for outputting a first pulse signal, outputting a second pulse signal and controlling the electric energy regulation work of the voltage regulation module 7, outputting a charging signal and controlling the charging work of the energy storage control module 8, receiving a first detection signal and outputting a first control signal to control the electric energy transmission work of the voltage regulation module 7, outputting a third pulse signal and controlling the electric energy regulation work of the superposition regulation module 9, receiving a second detection signal output by the welding module 6 and regulating the duty ratio of the first pulse signal and the second pulse signal, and receiving a third detection signal output by the superposition regulation module 9 and regulating the duty ratio of the third pulse signal;
the voltage superposition module 5 is connected with the voltage transformation adjusting module 3, the welding module 6, the voltage adjusting module 7 and the superposition adjusting module 9, and is used for rectifying and filtering the electric energy output by the voltage transformation adjusting module 3 and transmitting the electric energy to the welding module 6, and is used for superposing and rectifying the electric energy transmitted by the voltage adjusting module 7 and the pulse electric energy output by the superposition adjusting module 9 and transmitting the processed electric energy to the welding module 6;
the welding module 6 is used for receiving the electric energy output by the voltage superposition module 5 and performing welding work, detecting welding current and outputting a second detection signal;
the voltage regulating module 7 is connected with the power supply module 1 and is used for receiving a second pulse signal and performing voltage reduction regulation on the input electric energy, receiving a first control signal and transmitting the processed electric energy to the voltage superposition module 5;
the energy storage control module 8 is connected with the voltage regulation module 7 and the superposition regulation module 9 and is used for receiving the charging signal and storing the electric energy output by the voltage regulation module 7 and supplying power to the superposition regulation module 9;
the superposition adjusting module 9 is configured to receive the third pulse signal and perform isolation transformation on the electric energy released by the energy storage control module 8, and is configured to output pulse electric energy and transmit the pulse electric energy to the voltage superposition module 5.
In a specific embodiment, the power module 1 may use a power circuit to provide dc power; the current detection protection module 2 can adopt a current detection protection circuit formed by an overcurrent detection circuit and a protection control circuit, wherein the overcurrent detection circuit sets an overcurrent threshold value, carries out current detection and overcurrent judgment on the voltage conversion regulation module 3, and controls the transmission of electric energy by the protection control circuit and cuts off the electric energy when overcurrent occurs; the voltage transformation regulating module 3 can adopt a voltage transformation regulating circuit composed of an inverter, a transformer, a diode and the like to realize inversion regulation, isolation transformation and rectification of electric energy; the intelligent control module 4 can adopt a micro-control circuit, integrates a plurality of components such as an arithmetic unit, a controller, a memory, an input/output unit and the like, and realizes the functions of signal processing, data storage, module control, timing control and the like; the voltage superposition module 5 can adopt a voltage superposition circuit composed of a coupling transformer, a diode and the like, and can perform electric energy transmission and voltage superposition; the welding module 6 can adopt a welding device and a sampling resistor, the welding device performs welding work, and the sampling resistor performs current sampling; the voltage regulating module 7 can adopt a voltage regulating circuit to carry out voltage reduction regulation and transmission control on the input electric energy; the energy storage control module 8 can adopt an energy storage control circuit composed of a power tube, an energy storage device and the like to realize the storage and release of electric energy; the above-mentioned superposition regulating module 9 can adopt superposition regulating circuit formed from transformer and power tube, etc., and is controlled by intelligent control module 4, and can output pulse signal and regulate peak value of pulse signal.
In another embodiment, referring to fig. 1, 2, 3 and 4, the power module 1 includes a power processing device and a first capacitor C1; the current detection protection module 2 comprises a first relay switch K1-1; the voltage conversion regulating module 3 comprises a first inverter T1, a first transformer B1, a first diode D1 and a second diode D2; the intelligent control module 4 comprises a first controller U1;
specifically, a first end of the power supply processing device is connected with a first end of the first relay switch K1-1 and is connected with a second end of the power supply processing device and a ground end through the first capacitor C1, a second end of the first relay switch K1-1 is connected with a first input end of the first inverter T1, a second input end of the first inverter T1 is connected with the current detection protection module 2, a first output end and a second output end of the first inverter T1 are respectively connected with a first end and a second end of a primary side of the first transformer B1, a control end of the first inverter T1 is connected with an IO2 end of the first controller U1, a first end and a second end of a secondary side of the first transformer B1 are respectively connected with an anode of the first diode D1 and an anode of the second diode D2, a cathode of the first diode D1 and a cathode of the second diode D2 are connected, and a third end of the secondary side of the first transformer B1 is grounded.
In a specific embodiment, the power supply processing device may be composed of a power supply interface and a rectifier, wherein the power supply interface is connected with a mains voltage, and the rectifier performs rectification processing to provide direct current working electric energy; the first relay switch K1-1 can be a normally closed switch; the first inverter T1 may be an inverter formed by IGBTs; the first controller U1 can be an STM32 singlechip.
Further, the voltage superposition module 5 includes a third diode D3, a second transformer B2, a fourth diode D4, and a second capacitor C2; the welding module 6 comprises a welding device and a first resistor R1;
specifically, the anode of the third diode D3 is connected to the cathode of the first diode D1, the cathode of the third diode D3 is connected to the first end of the secondary side of the second transformer B2, the second end of the secondary side of the second transformer B2 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the first end of the welder device and is grounded through the second capacitor C2, the first end and the second end of the primary side of the second transformer B2 are connected to the superposition adjusting module 9, and the second end of the welder device is connected to the IO4 end of the first controller U1 and is grounded through the first resistor R1.
In a specific embodiment, the second transformer B2 may be a coupling transformer; the welding device is a welding load, and will not be described in detail herein; the first resistor R1 is a sampling resistor.
Further, the current detection protection module 2 further includes a second resistor R2, a seventh diode D7, a third capacitor C3, a signal processing device, a first comparator A1, a first threshold device, and a third resistor R3;
specifically, an anode of the seventh diode D7 is connected to the second input end of the first inverter T1 and grounded through the second resistor R2, a cathode of the seventh diode D7 is connected to the input end of the signal processing device and grounded through the third capacitor C3, the ground of the signal processing device is grounded, an output end of the signal processing device is connected to the in-phase end of the first comparator A1, an inverting end of the first comparator A1 is connected to the first threshold device, and an output end of the first comparator A1 is connected to the IO3 end of the first controller U1 through the third resistor R3.
In a specific embodiment, the second resistor R2 is a current sampling resistor; the signal processing device can adopt a signal amplifying circuit consisting of OP07 operational amplifiers; the first comparator A1 may be an LM397 comparator; the first threshold means provides an over-current threshold.
Further, the current detection protection module 2 further includes a first switching tube VT1, a first relay K1, and a first power VCC1;
specifically, the base of the first switching tube VT1 is connected to the output end of the first comparator A1, the emitter of the first comparator A1 is grounded, the collector of the first comparator A1 is connected to one end of the first relay K1, and the other end of the first relay K1 is connected to the first power source VCC1.
In a specific embodiment, the first switching transistor VT1 may be an NPN transistor; the first relay K1 is used for controlling the first relay switch K1-1 to be closed and powered off in a magnetic attraction mode, namely, when the first relay K1 is powered on, the first relay switch K1-1 is opened.
Further, the voltage regulating module 7 includes a voltage regulating device, a second power tube Q2, and a sixth diode D6;
specifically, a first input end and a second input end of the voltage regulating device are respectively connected with a first end and a ground end of the power supply processing device, a control end of the voltage regulating device is connected with an IO1 end of the first controller U1, a first output end of the voltage regulating device is connected with an energy storage control module 8 and a drain electrode of the second power tube Q2, a second output end of the voltage regulating device is grounded, a source electrode of the second power tube Q2 is connected with an anode of the sixth diode D6, a cathode of the sixth diode D6 is connected with a cathode of the first diode D1, and a grid electrode of the second power tube Q2 is connected with an IO5 end of the first controller U1.
In a specific embodiment, the voltage regulating device may be composed of a BUCK circuit; the second power tube Q2 can be an N-channel field effect tube to control the transmission of electric energy.
Further, the energy storage control module 8 includes a first power tube Q1, a fifth diode D5 and an energy storage device;
specifically, the drain electrode of the first power tube Q1 is connected to the first output end of the voltage regulator, the source electrode of the first power tube Q1 is connected to the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected to the first end of the energy storage device, the gate electrode of the first power tube Q1 is connected to the IO6 end of the first controller U1, and the second end of the energy storage device is grounded.
In a specific embodiment, the first power tube Q1 may be an N-channel field effect tube, so as to control the energy storage operation of the energy storage device; the energy storage device can adopt a lithium battery.
Further, the superposition adjusting module 9 includes a fourth capacitor C4, a fourth resistor R4, a third transformer B3, a third power tube Q3, a fifth resistor R5, and a fifth capacitor C5;
specifically, a first end of a primary side of the third transformer B3 is connected to one end of a fourth capacitor C4 and a first end of an energy storage device through a fourth resistor R4, a second end of the primary side of the third transformer B3 is connected to a drain electrode of the third power tube Q3, a source electrode of the third power tube Q3 is connected to an IO8 end of the first controller U1 and is grounded through a fifth resistor R5, another end of the fourth capacitor C4 is grounded, a first end of a secondary side of the third transformer B3 is connected to a first end of a primary side of the second transformer B2 through a fifth capacitor C5, a second end of a secondary side of the third transformer B3 is connected to a second end of the primary side of the second transformer B2, and a gate electrode of the third power tube Q3 is connected to an IO7 end of the first controller U1.
In a specific embodiment, the third power transistor Q3 may be an N-channel field effect transistor; the third transformer B3 may be an intermediate frequency transformer, and is controlled by the third power tube Q3 and outputs pulsed electric energy.
In the power supply safety protection circuit of the spot welder, the power supply processing device provides direct current working electric energy, the first controller U1 controls the voltage regulating device to perform voltage reduction and controls the first power tube Q1 to be conducted so as to provide charging electric energy for the energy storage device, when the energy storage device is full or the first inverter T1 is over-current, the first power tube Q1 is disconnected, meanwhile, the direct current working electric energy is transmitted by the first relay switch K1-1, the first controller U1 controls the first inverter T1 to perform inversion working and regulate output voltage according to a current signal sampled by the first resistor R1, the first transformer B1, the first diode D1 and the second diode D2 perform isolation transformation and rectification treatment, the third diode D3, the second transformer B2 and the fourth diode D4 are used for rectifying and transmitting the charging electric energy to the welding device to control the welding working of the welding device, the first inverter T1 is subjected to current detection by the second resistor R2, the detection signal is subjected to signal amplification processing by the signal processing device, the first comparator A1 is matched with the first threshold device to carry out overcurrent judgment, when overcurrent occurs, the first comparator A1 controls the first switch tube VT1 to be conducted, the first relay K1 controls the first relay switch K1-1 to be disconnected, the first controller U1 controls the second power tube Q2 to be conducted, the voltage regulating device is controlled to carry out voltage reduction operation and transmits electric energy to the voltage superposition module 5 through the second power tube Q2 and the sixth diode D6, the first controller U1 also controls the conduction degree of the third power tube Q3, the electric energy released by the energy storage device is processed by the third transformer B3 and the fifth capacitor C5 and outputs pulse electric energy, the pulse electric energy is continuously boosted and is subjected to voltage superposition with the electric energy transmitted by the sixth diode D6 through the second transformer B2, and the welding device performs welding work until the welding power of the welding device is reached.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. A power supply safety protection circuit of a spot welder is characterized in that,
this spot welder power supply safety protection circuit includes: the device comprises a power supply module, a current detection protection module, a voltage conversion regulation module, an intelligent control module, a voltage superposition module, a welding module, a voltage regulation module, an energy storage control module and a superposition regulation module;
the power supply module is used for providing direct-current working electric energy;
the current detection protection module is connected with the power supply module and the voltage conversion regulation module, and is used for transmitting direct-current working electric energy provided by the power supply module to the voltage conversion regulation module, carrying out current detection and overcurrent judgment on the voltage conversion regulation module, and outputting a first detection signal and stopping the transmission work of the electric energy when overcurrent occurs;
the voltage transformation adjusting module is connected with the intelligent control module and is used for receiving a first pulse signal output by the intelligent control module and performing inversion adjustment, isolation transformation and rectification on the input electric energy;
the intelligent control module is connected with the current detection protection module, the voltage regulation module, the energy storage control module, the superposition regulation module and the welding module, is used for outputting a first pulse signal, outputting a second pulse signal and controlling the electric energy regulation work of the voltage regulation module, outputting a charging signal and controlling the charging work of the energy storage control module, receiving the first detection signal and outputting a first control signal to control the electric energy transmission work of the voltage regulation module, outputting a third pulse signal and controlling the electric energy regulation work of the superposition regulation module, receiving the second detection signal output by the welding module and regulating the duty ratio of the first pulse signal and the second pulse signal, and receiving the third detection signal output by the superposition regulation module and regulating the duty ratio of the third pulse signal;
the voltage superposition module is connected with the voltage transformation adjusting module, the welding module, the voltage adjusting module and the superposition adjusting module, and is used for rectifying and filtering the electric energy output by the voltage transformation adjusting module and transmitting the electric energy to the welding module, and is used for superposing and rectifying the electric energy transmitted by the voltage adjusting module and the pulse electric energy output by the superposition adjusting module and transmitting the processed electric energy to the welding module;
the welding module is used for receiving the electric energy output by the voltage superposition module and performing welding work, detecting welding current and outputting a second detection signal;
the voltage regulating module is connected with the power supply module and is used for receiving a second pulse signal and carrying out voltage reduction regulation on the input electric energy, and the voltage regulating module is used for receiving a first control signal and transmitting the processed electric energy to the voltage superposition module;
the energy storage control module is connected with the voltage regulation module and the superposition regulation module, and is used for receiving the charging signal and storing the electric energy output by the voltage regulation module, and supplying power to the superposition regulation module;
the superposition adjusting module is used for receiving the third pulse signal and performing isolation transformation on the electric energy released by the energy storage control module, and is used for outputting pulse electric energy and transmitting the pulse electric energy to the voltage superposition module.
2. The spot welder power supply safety protection circuit of claim 1, wherein the power module comprises a power processing device and a first capacitor; the current detection protection module comprises a first relay switch; the voltage conversion regulating module comprises a first inverter, a first transformer, a first diode and a second diode; the intelligent control module comprises a first controller;
the first end of the power supply processing device is connected with the first end of the first relay switch and is connected with the second end of the power supply processing device and the ground end through the first capacitor, the second end of the first relay switch is connected with the first input end of the first inverter, the second input end of the first inverter is connected with the current detection protection module, the first output end and the second output end of the first inverter are respectively connected with the first end and the second end of the primary side of the first transformer, the control end of the first inverter is connected with the IO2 end of the first controller, the first end and the second end of the secondary side of the first transformer are respectively connected with the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected with the cathode of the second diode, and the third end of the secondary side of the first transformer is grounded.
3. The spot welder power supply safety protection circuit of claim 2, wherein the voltage superposition module comprises a third diode, a second transformer, a fourth diode, and a second capacitor; the welding module comprises a welding device and a first resistor;
the positive pole of third diode is connected the negative pole of first diode, and the first end of secondary side of second transformer is connected to the negative pole of third diode, and the second end of secondary side of second transformer is connected the positive pole of fourth diode, and the first end of welding machine device is connected to the negative pole of fourth diode and is earthed through the second electric capacity, and the first end and the second end of the primary side of second transformer are connected with stack adjustment module, and the IO4 end of first controller is connected to welding device's second end and is earthed through first resistance.
4. A spot welder power supply safety protection circuit according to claim 3 wherein the current detection protection module further comprises a second resistor, a seventh diode, a third capacitor, a signal processing device, a first comparator, a first threshold device, a third resistor;
the anode of the seventh diode is connected with the second input end of the first inverter and grounded through the second resistor, the cathode of the seventh diode is connected with the input end of the signal processing device and grounded through the third capacitor, the ground of the signal processing device is grounded, the output end of the signal processing device is connected with the in-phase end of the first comparator, the inverting end of the first comparator is connected with the first threshold device, and the output end of the first comparator is connected with the IO3 end of the first controller through the third resistor.
5. The spot welder power supply safety protection circuit of claim 4, wherein the current detection protection module further comprises a first switch tube, a first relay, a first power source;
the base electrode of the first switch tube is connected with the output end of the first comparator, the emitter electrode of the first comparator is grounded, the collector electrode of the first comparator is connected with one end of the first relay, and the other end of the first relay is connected with the first power supply.
6. The spot welder power supply safety protection circuit of claim 5, wherein the voltage regulation module comprises a voltage regulator, a second power tube, and a sixth diode;
the first input end and the second input end of the voltage regulating device are respectively connected with the first end and the ground end of the power supply processing device, the control end of the voltage regulating device is connected with the IO1 end of the first controller, the first output end of the voltage regulating device is connected with the energy storage control module and the drain electrode of the second power tube, the second output end of the voltage regulating device is grounded, the source electrode of the second power tube is connected with the anode of the sixth diode, the cathode of the sixth diode is connected with the cathode of the first diode, and the grid electrode of the second power tube is connected with the IO5 end of the first controller.
7. The spot welder power supply safety protection circuit of claim 6, wherein the energy storage control module comprises a first power tube, a fifth diode, and an energy storage device;
the drain electrode of the first power tube is connected with the first output end of the voltage regulating device, the source electrode of the first power tube is connected with the anode of the fifth diode, the cathode of the fifth diode is connected with the first end of the energy storage device, the grid electrode of the first power tube is connected with the IO6 end of the first controller, and the second end of the energy storage device is grounded.
8. The spot welder power supply safety protection circuit of claim 7, wherein the superposition adjustment module comprises a fourth capacitor, a fourth resistor, a third transformer, a third power tube, a fifth resistor, and a fifth capacitor;
the first end of the primary side of the third transformer is connected with one end of the fourth capacitor and the first end of the energy storage device through the fourth resistor, the second end of the primary side of the third transformer is connected with the drain electrode of the third power tube, the source electrode of the third power tube is connected with the IO8 end of the first controller and grounded through the fifth resistor, the other end of the fourth capacitor is grounded, the first end of the secondary side of the third transformer is connected with the first end of the primary side of the second transformer through the fifth resistor, the second end of the secondary side of the third transformer is connected with the second end of the primary side of the second transformer, and the grid electrode of the third power tube is connected with the IO7 end of the first controller.
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