A direct current welding power supply circuit for PCB board

Abstract

The application discloses a direct-current welding power supply circuit for a PCB, and relates to the technical field of welding power supply, which comprises a first adjusting module, can provide power adjustment processing to the electric energy provided by a power module and provide high-frequency pulse electric energy, can cooperate with a pulse compensation module to provide compensation processing to the high-frequency pulse electric energy, can provide pulse arc striking by a high-frequency arc striking module, can absorb peak voltage by an absorption module and store by an energy storage device, when the electric energy of the energy storage device reaches full power, can compensate the high-frequency pulse electric energy by an electric energy compensation module, when high-frequency arc striking control is not needed, can cooperate with a second adjusting module and a high-frequency arc striking module by a channel switching module to provide superposition processing to the high-frequency pulse electric energy output by the first adjusting module. The direct-current welding power supply circuit for the PCB can improve welding power supply precision, improve welding stability, perform energy-saving control, improve power supply power, and provide a larger range of welding voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding power supply, in particular to a direct current welding power supply circuit for PCB. BACKGROUND

[0002] PCB, also known as printed circuit board, is a key carrier for supporting and connecting motor components, and provides mechanical support and electrical connection for electronic components. In order to firmly connect the motor components on the PCB, welding technology needs to be used. In the prior art, the direct current welding power supply for PCB generally adopts a high-frequency inverter direct current power supply mode. In order to improve the precision of the welding power supply, a constant current source is additionally used to compensate the pulse power provided by the high-frequency inverter direct current power supply. In addition, some welding power supplies have high-frequency arc striking function, but the additional constant current source or high-frequency arc striking may cause the power supply power to decrease, thereby reducing the power supply precision of the high-frequency inverter direct current power supply. Moreover, the welding mode of the high-frequency inverter direct current power supply is relatively single, and cannot provide a larger range of welding voltage, so it needs to be improved. SUMMARY

[0003] The present application provides a direct current welding power supply circuit for PCB to solve the problems in the background art.

[0004] According to the embodiment of the present application, a direct current welding power supply circuit for PCB is provided, comprising: a power module for rectifying, filtering, inverting and transforming the input power and outputting first power and second power;

[0005] A first adjusting module is connected with the power module, for rectifying and power adjusting the first power and outputting first pulse power;

[0006] An absorbing module is connected with the first adjusting module, for absorbing and storing the peak voltage of the first pulse power and providing third power;

[0007] A pulse compensation module is connected with the power module and the first adjusting module, for rectifying the second power and pulse compensating the first pulse power;

[0008] A high-frequency arc striking module is connected with the first adjusting module, the power module and the second adjusting module, for isolating and transforming the transmitted second power and outputting fifth power, high-frequency oscillating the fifth power and outputting second pulse power, and superimposing the second pulse power or the third pulse power output by the second adjusting module with the first pulse power and outputting fourth pulse power;

[0009] The micro control module is connected with the first adjusting module, the high-frequency arc striking module, the electric energy compensation module, the pulse compensation module and the second adjusting module, and is used for controlling the first adjusting module to perform power adjustment, controlling the electric energy compensation module to perform power adjustment work and controlling the pulse compensation module to stop pulse compensation work when the third electric energy is greater than a set full power threshold, controlling the high-frequency arc striking module to transmit electric energy when high-frequency arc striking is needed, outputting a first control signal and controlling the second adjusting module to perform power adjustment and controlling the high-frequency arc striking module to stop high-frequency oscillation work when high-frequency arc striking is not needed and output electric energy power needs to be improved, outputting the first control signal and controlling the second adjusting module to perform power adjustment, controlling the high-frequency arc striking module to perform electric energy transmission and stop high-frequency oscillation work, and outputting a second control signal and controlling the second adjusting module to perform power adjustment, and controlling the high-frequency arc striking module to stop electric energy transmission and high-frequency oscillation work;

[0010] The channel switching module is connected with the high-frequency arc striking module, the power supply module, the micro control module and the second adjusting module, is used for receiving the first control signal and transmitting the second electric energy to the second adjusting module, and receiving the second control signal and transmitting the fifth electric energy to the second adjusting module;

[0011] The second adjusting module is used for performing power adjustment on the second electric energy or the fifth electric energy and outputting third pulse electric energy;

[0012] The electric energy compensation module is connected with the first adjusting module and the absorbing module, is used for performing power adjustment on the third electric energy and pulse compensation processing on the first pulse electric energy;

[0013] The output module is connected with the first adjusting module and the high-frequency arc striking module, is used for receiving the first pulse signal or the fourth pulse electric energy and performing welding work.

[0014] As a further scheme of the present application, the power supply module comprises a power supply interface, a first rectifier, a first capacitor, a first inverter, a second inverter, a first transformer and a second transformer;

[0015] Preferably, the first end and the second end of the power supply interface are connected with the first end and the second end of the first rectifier respectively, the third end of the first rectifier is connected with the first end of the first inverter and the first end of the second inverter, and the fourth end of the first rectifier, the second end of the first inverter and the second end of the second inverter are connected through the first capacitor, the third end and the fourth end of the first inverter are connected with the first end and the second end of the primary side of the first transformer respectively, and the third end and the fourth end of the second inverter are connected with the first end and the second end of the primary side of the second transformer respectively.

[0016] As a further scheme of the present application, the first adjusting module comprises a first diode, a second diode, a first inductor, a first power tube and a third diode; and the micro control module comprises a first controller.

[0017] Preferably, the anode of the first diode and the anode of the second diode are connected to the first end and the third end of the secondary side of the first transformer respectively, the cathode of the first diode is connected to the cathode of the second diode and the anode of the third diode and the collector of the first power tube through the first inductor, the emitter of the first power tube is connected to the third end of the secondary side of the first transformer, and the gate of the first power tube is connected to the IO1 end of the first controller.

[0018] As a further scheme of the present application, the pulse compensation module comprises a first thyristor, a second thyristor, a second inductor and a first inverter.

[0019] Preferably, the anode of the first thyristor and the anode of the second thyristor are connected to the first end and the third end of the first secondary side of the second transformer respectively, the cathode of the first thyristor is connected to the cathode of the second thyristor and the cathode of the third diode through the second inductor, the control end of the first thyristor is connected to the control end of the second thyristor and the output end of the first inverter, the input end of the first inverter is connected to the IO4 end of the first controller and the electric energy compensation module, and the second end of the first secondary side of the second transformer is connected to the collector of the first power tube.

[0020] As a further scheme of the present application, the high-frequency arc striking module comprises a third thyristor, a first resistor, a third capacitor, a third transformer, a fourth thyristor, a second inverter, a second resistor, a fourth capacitor, a fourth transformer and a spark discharge device; and the output module comprises a second capacitor and an electrode device.

[0021] Preferably, one end of the third thyristor is connected to the first end of the second secondary side of the second transformer, the other end of the third thyristor is connected to the first end of the primary side of the third transformer through the third capacitor, the second end of the primary side of the third transformer is connected to the second end of the second secondary side of the second transformer through the first resistor, the first end of the secondary side of the third transformer is connected to one end of the fourth thyristor, the other end of the fourth thyristor is connected to one end of the spark discharge device and the first end of the primary side of the fourth transformer through the fourth capacitor, the second end of the primary side of the fourth transformer is connected to the other end of the spark discharge device and the third end of the secondary side of the third transformer through the second resistor, the control end of the fourth thyristor is connected to the output end of the second inverter, the input end of the second inverter and the control end of the third thyristor are connected to the IO3 end and the IO2 end of the first controller respectively, the first end of the secondary side of the fourth transformer is connected to the emitter of the first power tube and the first end of the electrode device and the cathode of the third diode through the second capacitor, and the second end of the secondary side of the fourth transformer is connected to the second end of the electrode device.

[0022] As a further scheme of the present application, the path switching module comprises a fifth thyristor, a sixth thyristor and a seventh thyristor.

[0023] Preferably, the anode of the fifth thyristor, the anode of the sixth thyristor and the first end of the seventh thyristor are connected to the first end, the third end and the second end of the secondary side of the third transformer respectively, the cathode of the fifth thyristor is connected to the cathode of the sixth thyristor, the second end of the seventh thyristor is connected to the second adjusting device, the control end of the fifth thyristor is connected to the control end of the sixth thyristor, the control end of the seventh thyristor and the IO6 end of the first controller.

[0024] As a further scheme of the present application, the path switching module further comprises an eighth thyristor, a ninth thyristor, a fourth diode and a tenth thyristor.

[0025] Preferably, the anode of the eighth thyristor, the anode of the ninth thyristor and the first end of the tenth thyristor are connected to the first end, the third end and the second end of the secondary side of the second transformer respectively, the control end of the eighth thyristor is connected to the control end of the ninth thyristor, the control end of the tenth thyristor, the anode of the fourth diode and the IO5 end of the first controller, the cathode of the fourth diode is connected to the control end of the third thyristor, the second end of the tenth thyristor is connected to the second adjusting module.

[0026] As a further scheme of the present application, the second adjusting module comprises a third inductor, a second power tube and a seventh diode.

[0027] Preferably, the anode of the seventh diode is connected to the collector of the second power tube and connected to the cathode of the eighth thyristor and the cathode of the fifth thyristor through the third inductor, the emitter of the second power tube is connected to the second end of the tenth thyristor, the second end of the seventh thyristor and the second end of the primary side of the fourth transformer, the cathode of the seventh diode is connected to the first end of the primary side of the fourth transformer, the gate of the second power tube is connected to the IO8 end of the first controller.

[0028] As a further scheme of the present application, the absorption module comprises a fifth diode, a fifth capacitor, a third resistor, a sixth diode and an energy storage device.

[0029] Preferably, the cathode of the fifth diode is connected to the cathode of the third diode and connected to the anode of the sixth diode and one end of the fifth capacitor through the third resistor, the other end of the fifth capacitor is connected to the second end of the energy storage device and the emitter of the first power tube, the cathode of the sixth diode is connected to the first end of the energy storage device and the electric energy compensation module.

[0030] As a further scheme of the present application, the electric energy compensation module comprises a third power tube and a power adjusting device.

[0031] Preferably, the drain of the third power tube is connected to the first end of the energy storage device, the source of the third power tube is connected to the input end of the power adjusting device, the output end of the power adjusting device is connected to the cathode of the third diode, the gate of the third power tube is connected to the IO7 end of the first controller.

[0032] Compared with the prior art, the beneficial effects of the present application are that the DC welding power supply circuit for the PCB board can provide power regulation processing and high-frequency pulse power to the power provided by the first regulating module, cooperate with the pulse compensation module to compensate the high-frequency pulse power, improve the welding power precision, carry out pulse arc starting by the high-frequency arc starting module, improve the welding stability, absorb the peak voltage by the absorption module and store it through the energy storage device, when the energy of the energy storage device reaches full power, compensate the high-frequency pulse power through the energy compensation module, not only save energy and improve the power supply power, when the high-frequency arc starting control is not needed, the high-frequency pulse power output by the first regulating module can be superimposed by the path switching module cooperating with the second regulating module and the high-frequency arc starting module, and a larger range of welding voltage can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0034] Figure 1 A principle block diagram of a DC welding power supply circuit for a PCB board provided by the embodiments of the present application.

[0035] Figure 2 A circuit diagram of a DC welding power supply circuit for a PCB board provided by the embodiments of the present application.

[0036] Figure 3 A first circuit diagram of a path switching module provided by the embodiments of the present application.

[0037] Figure 4 A second circuit diagram of a path switching module provided by the embodiments of the present application.

[0038] Figure 5 A circuit diagram of a second regulating module provided by the embodiments of the present application.

[0039] Figure 6 A circuit diagram of an absorption module provided by the embodiments of the present application.

[0040] Figure 7 A circuit diagram of an energy compensation module provided by the embodiments of the present application. DETAILED DESCRIPTION

[0041] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0042] In one embodiment, referring to Figure 1 A direct current welding power supply circuit for a PCB board comprises: a power module 1 for rectifying, filtering, inverting and transforming input power and outputting first power and second power;

[0043] A first regulating module 2 connected with the power module 1 for rectifying and regulating the first power and outputting first pulse power;

[0044] An absorption module 3 connected with the first regulating module 2 for absorbing and storing peak voltage of the first pulse power and providing third power;

[0045] A pulse compensation module 4 connected with the power module 1 and the first regulating module 2 for rectifying the second power and compensating the first pulse power;

[0046] A high-frequency arc starting module 5 connected with the first regulating module 2, the power module 1 and a second regulating module 7 for isolating and transforming the second power and outputting fifth power, oscillating the fifth power and outputting second pulse power, and superimposing the second pulse power or third pulse power outputted by the second regulating module 7 with the first pulse power and outputting fourth pulse power;

[0047] A micro-control module 9 connected with the first regulating module 2, the high-frequency arc starting module 5, an energy compensation module 8, the pulse compensation module 4 and the second regulating module 7 for controlling the first regulating module 2 to regulate power, controlling the energy compensation module 8 to regulate power and controlling the pulse compensation module 4 to stop pulse compensation when the third power is greater than a set full power threshold, controlling the high-frequency arc starting module 5 to transmit power when high-frequency arc starting is needed, outputting a first control signal and controlling the second regulating module 7 to regulate power and controlling the high-frequency arc starting module 5 to stop high-frequency oscillation when high-frequency arc starting is not needed and output power needs to be increased, outputting the first control signal and controlling the second regulating module 7 to regulate power, controlling the high-frequency arc starting module 5 to transmit power and stop high-frequency oscillation, outputting a second control signal and controlling the second regulating module 7 to regulate power, and controlling the high-frequency arc starting module 5 to stop power transmission and high-frequency oscillation;

[0048] The path switching module 6 is connected with the high-frequency arc striking module 5, the power supply module 1, the micro-control module 9 and the second adjusting module 7, used for receiving the first control signal and transmitting the second electric energy to the second adjusting module 7, and receiving the second control signal and transmitting the fifth electric energy to the second adjusting module 7;

[0049] The second adjusting module 7 is used for power adjusting the second electric energy or the fifth electric energy and outputting the third pulsed electric energy;

[0050] The electric energy compensation module 8 is connected with the first adjusting module 2 and the absorbing module 3, used for power adjusting the third electric energy and pulse compensating the first pulsed electric energy;

[0051] The output module 10 is connected with the first adjusting module 2 and the high-frequency arc striking module 5, used for receiving the first pulsed signal or the fourth pulsed electric energy and carrying out the welding work.

[0052] In the embodiment, the power supply module 1 can adopt a power supply circuit composed of a power supply interface, a rectifier, an inverter, a transformer and the like, can carry out rectification filtering, inversion and transformation processing on the input electric energy; the first adjusting module 2 can adopt a first adjusting circuit composed of a diode, an IGBT, an inductor and the like, can carry out rectification and power adjusting processing on the input electric energy, and then provide the high-frequency pulsed electric energy, i.e. the first pulsed electric energy; the absorbing module 3 can adopt an absorbing circuit composed of a diode, a capacitor, an energy storage device and the like, can absorb the sharp peak voltage, store and supply the electric energy; the pulse compensation module 4 can adopt a pulse compensation circuit composed of a thyristor, an inductor and an inverter, can carry out rectification adjusting and provide a direct current with adjustable amplitude; the high-frequency arc striking module 5 can adopt a high-frequency arc striking circuit composed of a thyristor, a capacitor, a transformer, an inverter and the like, can control the transmission, transformation, high-frequency oscillation and electric energy superposition of the electric energy; the path switching module 6 can adopt a path switching circuit composed of a thyristor and a diode, can control the connection state of the second adjusting module 7 and the high-frequency arc striking module 5; the second adjusting module 7 can adopt a second adjusting circuit composed of an inductor, an IGBT and a diode, can carry out power adjusting on the input electric energy; the electric energy compensation module 8 can adopt an electric energy compensation circuit composed of a field effect tube and a power adjusting device, carries out power adjusting on the electric energy provided by the absorbing module 3; the micro-control module 9 can adopt a micro-control circuit composed of a single-chip microcomputer, integrates many components such as an operator, a controller, a memory and an input-output device, and realizes the functions of signal processing, data storage, module control, timing control and the like; the output module 10 can adopt an output circuit composed of an electrode device and a capacitor, can input the electric energy and carry out the welding work.

[0053] In another embodiment, please refer to Figure 1 and Figure 2The power module 1 comprises a power interface, a first rectifier T1, a first capacitor C1, a first inverter T2, a second inverter T3, a first transformer B1 and a second transformer B2.

[0054] Specifically, the first end and the second end of the power interface are connected to the first end and the second end of the first rectifier T1 respectively, the third end of the first rectifier T1 is connected to the first end of the first inverter T2 and the first end of the second inverter T3, and the fourth end of the first rectifier T1, the second end of the first inverter T2 and the second end of the second inverter T3 are connected through the first capacitor C1, the third end and the fourth end of the first inverter T2 are connected to the first end and the second end of the primary side of the first transformer B1 respectively, and the third end and the fourth end of the second transformer B2 are connected to the first end and the second end of the primary side of the second transformer B2 respectively.

[0055] In specific embodiments, the first inverter T2 and the second inverter T3 can each be an inverter composed of four groups of IGBTs; the first transformer B1 adopts a single secondary winding, and the second transformer B2 adopts a double secondary winding.

[0056] Further, the first regulating module 2 comprises a first diode D1, a second diode D2, a first inductor L1, a first power tube Q1 and a third diode D3; the micro-control module 9 comprises a first controller U1.

[0057] Specifically, the anode of the first diode D1 and the anode of the second diode D2 are connected to the first end and the third end of the secondary side of the first transformer B1 respectively, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and is connected to the anode of the third diode D3 and the collector of the first power tube Q1 through the first inductor L1, the emitter of the first power tube Q1 is connected to the third end of the secondary side of the first transformer B1, and the gate of the first power tube Q1 is connected to the IO1 end of the first controller U1.

[0058] In specific embodiments, the first power tube Q1 can be an IGBT, and the first controller U1 can be an STM32 single-chip microcomputer.

[0059] Further, the pulse compensation module 4 comprises a first thyristor S1, a second thyristor S2, a second inductor L2 and a first inverter INV1.

[0060] Specifically, the anode of the first thyristor S1 and the anode of the second thyristor S2 are connected to the first end and the third end of the first secondary side of the second transformer B2 respectively, the cathode of the first thyristor S1 is connected to the cathode of the second thyristor S2 and the cathode of the third diode D3 through the second inductor L2, the control end of the first thyristor S1 is connected to the control end of the second thyristor S2 and the output end of the first inverter INV1, the input end of the first inverter INV1 is connected to the IO4 end of the first controller U1 and the electric energy compensation module 8, and the second end of the first secondary side of the second transformer B2 is connected to the collector of the first power tube Q1.

[0061] In a specific embodiment, the first thyristor S1 and the second thyristor S2 can be selected as unidirectional thyristors.

[0062] Further, the high-frequency arc striking module 5 includes a third thyristor S3, a first resistor R1, a third capacitor C3, a third transformer B3, a fourth thyristor S4, a second inverter INV2, a second resistor R2, a fourth capacitor C4, a fourth transformer B4 and a spark gap, and the output module 10 includes the second capacitor C2 and the electrode device.

[0063] Specifically, one end of the third thyristor S3 is connected to the first end of the second secondary side of the second transformer B2, the other end of the third thyristor S3 is connected to the first end of the primary side of the third transformer B3 through the third capacitor C3, the second end of the primary side of the third transformer B3 is connected to the second end of the second secondary side of the second transformer B2 through the first resistor R1, the first end of the secondary side of the third transformer B3 is connected to one end of the fourth thyristor S4, the other end of the fourth thyristor S4 is connected to one end of the spark gap and the first end of the primary side of the fourth transformer B4 through the fourth capacitor C4, the second end of the primary side of the fourth transformer B4 is connected to the other end of the spark gap and the third end of the secondary side of the third transformer B3 through the second resistor R2, the control end of the fourth thyristor S4 is connected to the output end of the second inverter INV2, the input end of the second inverter INV2 and the control end of the third thyristor S3 are connected to the IO3 end and the IO2 end of the first controller U1 respectively, the first end of the secondary side of the fourth transformer B4 is connected to the emitter of the first power tube Q1 and the first end of the electrode device and the cathode of the third diode D3 through the second capacitor C2, and the second end of the secondary side of the fourth transformer B4 is connected to the second end of the electrode device.

[0064] In a specific embodiment, the third thyristor S3 and the fourth thyristor S4 can be selected as bidirectional thyristors.

[0065] In another embodiment, please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5The channel switching module 6 comprises a fifth thyristor S5, a sixth thyristor S6 and a seventh thyristor S7.

[0066] Specifically, the anode of the fifth thyristor S5, the anode of the sixth thyristor S6 and the first end of the seventh thyristor S7 are connected to the first end, the third end and the second end of the secondary side of the third transformer B3 respectively, the cathode of the fifth thyristor S5 is connected to the cathode of the sixth thyristor S6, the second end of the seventh thyristor S7 is connected to the second adjusting device, the control end of the fifth thyristor S5 is connected to the control end of the sixth thyristor S6, the control end of the seventh thyristor S7 and the IO6 end of the first controller U1.

[0067] In a specific embodiment, the fifth thyristor S5 and the sixth thyristor S6 can be selected as unidirectional thyristors, and the seventh thyristor S7 can be selected as a bidirectional thyristor.

[0068] Further, the channel switching module 6 further comprises an eighth thyristor S8, a ninth thyristor S9, a fourth diode D4 and a tenth thyristor S10.

[0069] Specifically, the anode of the eighth thyristor S8, the anode of the ninth thyristor S9 and the first end of the tenth thyristor S10 are connected to the first end, the third end and the second end of the secondary side of the second transformer B2 respectively, the control end of the eighth thyristor S8 is connected to the control end of the ninth thyristor S9, the control end of the tenth thyristor S10, the anode of the fourth diode D4 and the IO5 end of the first controller U1, the cathode of the fourth diode D4 is connected to the control end of the third thyristor S3, and the second end of the tenth thyristor S10 is connected to the second adjusting module 7.

[0070] In a specific embodiment, the eighth thyristor S8 and the ninth thyristor S9 can be selected as unidirectional thyristors, and the tenth thyristor S10 can be selected as a bidirectional thyristor.

[0071] Further, the second adjusting module 7 comprises a third inductor L3, a second power tube Q2 and a seventh diode D7.

[0072] Specifically, the anode of the seventh diode D7 is connected to the collector of the second power tube Q2 and connected to the cathode of the eighth thyristor S8 and the cathode of the fifth thyristor S5 through the third inductor L3, the emitter of the second power tube Q2 is connected to the second end of the tenth thyristor S10, the second end of the seventh thyristor S7 and the second end of the primary side of the fourth transformer B4, the cathode of the seventh diode D7 is connected to the first end of the primary side of the fourth transformer B4, and the gate of the second power tube Q2 is connected to the IO8 end of the first controller U1.

[0073] In a specific embodiment, the second power tube Q2 can be selected as an IGBT.

[0074] In another embodiment, please refer to Figure 1、 Figure 6 and Figure 7 The absorption module 3 comprises a fifth diode D5, a fifth capacitor C5, a third resistor R3, a sixth diode D6 and an energy storage device;

[0075] Specifically, the cathode of the fifth diode D5 is connected to the cathode of the third diode D3, and the anode of the sixth diode D6 and one end of the fifth capacitor C5 are connected through the third resistor R3, the other end of the fifth capacitor C5 is connected to the second end of the energy storage device and the emitter of the first power tube Q1, and the cathode of the sixth diode D6 is connected to the first end of the energy storage device and the electric energy compensation module 8.

[0076] In specific embodiments, the energy storage device can be a lithium battery.

[0077] Further, the electric energy compensation module 8 comprises a third power tube Q3 and a power regulating device;

[0078] Specifically, the drain of the third power tube Q3 is connected to the first end of the energy storage device, the source of the third power tube Q3 is connected to the input end of the power regulating device, the output end of the power regulating device is connected to the cathode of the third diode D3, and the gate of the third power tube Q3 is connected to the IO7 end of the first controller U1.

[0079] In specific embodiments, the third power tube Q3 can be an N-channel field effect tube, and the power regulating device can be composed of a Boost circuit.

[0080] The direct current welding power supply circuit for PCB board in this embodiment, the power supply interface accesses power and is rectified and filtered and inverter processed by the first rectifier T1, the first capacitor C1, the first inverter T2 and the second inverter T3, the first transformer B1 is transformed and outputs the first power, the second transformer B2 is transformed and outputs the second power, the first diode D1 and the second diode D2 are rectified, the IO1 end of the first controller U1 controls the conduction state of the first power tube Q1, cooperates with the first inductor L1 and the third diode D3 to regulate power and output the first pulse power, the first inverter INV1 triggers the first thyristor S1 and the second thyristor S2 to conduct, cooperates with the second inductor L2 to provide an amplitude adjustable direct current and compensates the first pulse power, at the same time, when high frequency arc striking is needed, the IO2 end of the first controller U1 controls the third thyristor S3 to conduct, the third transformer B3 is transformed and outputs the fifth power, the second inverter INV2 triggers the fourth thyristor S4 to conduct, cooperates with the fourth capacitor C4 and the spark discharge device to oscillate at high frequency and provide the third pulse power and the processed first pulse signal for superposition processing, and controls the electrode device to work, the fifth diode D5, the third resistor R3 and the fifth capacitor C5 absorb the peak voltage and are stored by the energy storage device, when the stored energy reaches the full threshold set by the first controller U1, the IO7 end of the first controller U1 controls the third power tube Q3 to conduct, controls the first thyristor S1 and the second thyristor S2 to cut off, the power regulating device regulates power and provides an amplitude adjustable direct current, when high frequency arc striking is not needed, and the welding voltage needs to be increased, the IO5 end of the first controller U1 outputs the first control signal, controls the eighth thyristor S8, the ninth thyristor S9, the third thyristor S3 and the tenth thyristor S10 to conduct, the IO2 end of the first controller U1 stops controlling the third thyristor S3 to conduct, the IO3 end of the first controller U1 triggers the first inverter INV1 to flip, the fourth thyristor S4 is cut off, so that the spark discharge device stops working, stops high frequency oscillation, so that the second power output by the second secondary side of the second transformer B2 is transmitted to the third inductor L3, the IO8 end of the first controller U1 triggers the second power tube Q2 to be turned on, cooperates with the seventh diode D7 to regulate power, and is superimposed with the first pulse power through the fourth transformer B4, and the same, when the welding voltage needs to be further increased, the IO6 end of the first controller U1 outputs the second control signal, triggers the fifth thyristor S5, the sixth thyristor S6 and the seventh thyristor S7 to conduct, the power is transmitted to the second regulating module 7 for power regulation, and then is superimposed with the first pulse power.

[0081] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application 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. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0082] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A DC welding power supply circuit for PCB boards, characterized in that, The circuit includes: The power module is used to rectify, filter, invert, and transform the incoming electrical energy and output the first electrical energy and the second electrical energy. The first regulation module is connected to the power supply module and is used to rectify and regulate the power of the first electrical energy and output the first pulse electrical energy. An absorption module, connected to the first regulation module, is used to absorb and store the peak voltage of the first pulse electrical energy and provide third electrical energy. The pulse compensation module, connected to the power supply module and the first regulation module, is used to rectify the second electrical energy and perform pulse compensation processing on the first pulse electrical energy. The high-frequency arc-starting module is connected to the first adjustment module, the power supply module and the second adjustment module. It is used to isolate and transform the transmitted second electrical energy and output the fifth electrical energy, perform high-frequency oscillation on the fifth electrical energy and output the second pulse electrical energy, and superimpose the second pulse electrical energy or the third pulse electrical energy output by the second adjustment module with the first pulse electrical energy and output the fourth pulse electrical energy. The microcontroller module is connected to the first adjustment module, the high-frequency arc ignition module, the power compensation module, the pulse compensation module, and the second adjustment module. It controls the first adjustment module to perform power adjustment. When the third power is greater than the set full-charge threshold, it controls the power compensation module to perform power adjustment and controls the pulse compensation module to stop pulse compensation. When high-frequency arc ignition is required, it controls the high-frequency arc ignition module to transmit power. When high-frequency arc ignition is not required and the output power needs to be increased, it outputs a first control signal to control the second adjustment module to perform power adjustment and controls the high-frequency arc ignition module to stop high-frequency oscillation. It also outputs a first control signal to control the second adjustment module to perform power adjustment, controls the high-frequency arc ignition module to transmit power and stop high-frequency oscillation, and outputs a second control signal to control the second adjustment module to perform power adjustment, controls the high-frequency arc ignition module to stop power transmission and high-frequency oscillation. The path switching module is connected to the high-frequency arc ignition module, the power supply module, the microcontroller module, and the second regulation module. It is used to receive the first control signal and transmit the second electrical energy to the second regulation module, and to receive the second control signal and transmit the fifth electrical energy to the second regulation module. The second adjustment module is used to adjust the power of the second or fifth electrical energy and output the third pulse electrical energy; The power compensation module is connected to the first regulation module and the absorption module, and is used to regulate the power of the third power and perform pulse compensation processing on the first pulse power. The output module, connected to the first adjustment module and the high-frequency arc ignition module, is used to receive the first pulse signal or the fourth pulse electrical energy and perform welding work.

2. The DC welding power supply circuit for PCB boards according to claim 1, characterized in that, The power module includes a power interface, a first rectifier, a first capacitor, a first inverter, a second inverter, a first transformer, and a second transformer. The first and second ends of the power interface are respectively connected to the first and second ends of the first rectifier. The third end of the first rectifier is connected to the first and second ends of the first inverter and the first end of the second inverter, and is connected to the fourth end of the first rectifier, the second end of the first inverter, and the second end of the second inverter through the first capacitor. The third and fourth ends of the first inverter are respectively connected to the first and second ends of the primary side of the first transformer. The third and fourth ends of the second inverter are respectively connected to the first and second ends of the primary side of the second transformer.

3. The DC soldering power supply circuit for PCB boards according to claim 2, characterized in that, The first adjustment module includes a first diode, a second diode, a first inductor, a first power transistor, and a third diode; the microcontroller module includes a first controller; The anodes of the first diode and the second diode are respectively connected to the first and third terminals of the secondary side of the first transformer. The cathode of the first diode is connected to the cathode of the second diode and is connected to the anode of the third diode and the collector of the first power transistor through the first inductor. The emitter of the first power transistor is connected to the third terminal of the secondary side of the first transformer, and the gate of the first power transistor is connected to the IO1 terminal of the first controller.

4. The DC soldering power supply circuit for PCB boards according to claim 3, characterized in that, The pulse compensation module includes a first thyristor, a second thyristor, a second inductor, and a first inverter; The anodes of the first and second thyristors are respectively connected to the first and third terminals of the first secondary side of the second transformer. The cathode of the first thyristor is connected to the cathode of the second thyristor and is connected to the cathode of the third diode through the second inductor. The control terminal of the first thyristor is connected to the control terminal of the second thyristor and the output terminal of the first inverter. The input terminal of the first inverter is connected to the IO4 terminal of the first controller and the power compensation module. The second terminal of the first secondary side of the second transformer is connected to the collector of the first power transistor.

5. A DC welding power supply circuit for PCB boards according to claim 4, characterized in that, The high-frequency arc-initiating module includes a third thyristor, a first resistor, a third capacitor, a third transformer, a fourth thyristor, a second inverter, a second resistor, a fourth capacitor, a fourth transformer, and a spark discharge device; the output module includes a second capacitor and an electrode device. One end of the third thyristor is connected to the first end of the second secondary side of the second transformer. The other end of the third thyristor is connected to the first end of the primary side of the third transformer through the third capacitor. The second end of the primary side of the third transformer is connected to the second end of the second secondary side of the second transformer through the first resistor. The first end of the secondary side of the third transformer is connected to one end of the fourth thyristor. The other end of the fourth thyristor is connected to one end of the spark discharge device and is connected to the first end of the primary side of the fourth transformer through the fourth capacitor. The second end of the primary side of the fourth transformer is connected to the other end of the spark discharge device and is connected to the third end of the secondary side of the third transformer through the second resistor. The control terminal of the fourth thyristor is connected to the output terminal of the second inverter. The input terminal of the second inverter and the control terminal of the third thyristor are respectively connected to the IO3 and IO2 terminals of the first controller. The first end of the secondary side of the fourth transformer is connected to the emitter of the first power transistor and is connected to the first end of the electrode device and the cathode of the third diode through the second capacitor. The second end of the secondary side of the fourth transformer is connected to the second end of the electrode device.

6. A DC soldering power supply circuit for a PCB board according to claim 5, characterized in that, The path switching module includes a fifth thyristor, a sixth thyristor, and a seventh thyristor; The anode of the fifth thyristor, the anode of the sixth thyristor, and the first terminal of the seventh thyristor are respectively connected to the first terminal, the third terminal, and the second terminal of the secondary side of the third transformer. The cathode of the fifth thyristor is connected to the cathode of the sixth thyristor. The second terminal of the seventh thyristor is connected to the second regulating module. The control terminal of the fifth thyristor is connected to the control terminals of the sixth thyristor, the control terminals of the seventh thyristor, and the IO6 terminal of the first controller.

7. A DC soldering power supply circuit for a PCB board according to claim 6, characterized in that, The path switching module also includes an eighth thyristor, a ninth thyristor, a fourth diode, and a tenth thyristor; The anode of the eighth thyristor, the anode of the ninth thyristor, and the first terminal of the tenth thyristor are respectively connected to the first terminal, the third terminal, and the second terminal of the secondary side of the second transformer. The control terminal of the eighth thyristor is connected to the control terminals of the ninth thyristor, the tenth thyristor, the anode of the fourth diode, and the IO5 terminal of the first controller. The cathode of the fourth diode is connected to the control terminal of the third thyristor. The second terminal of the tenth thyristor is connected to the second adjustment module.

8. A DC soldering power supply circuit for a PCB board according to claim 7, characterized in that, The second adjustment module includes a third inductor, a second power transistor, and a seventh diode; The anode of the seventh diode is connected to the collector of the second power transistor and is connected to the cathode of the eighth and fifth thyristors through the third inductor. The emitter of the second power transistor is connected to the second terminal of the tenth thyristor, the second terminal of the seventh thyristor, and the second terminal of the primary side of the fourth transformer. The cathode of the seventh diode is connected to the first terminal of the primary side of the fourth transformer. The gate of the second power transistor is connected to the IO8 terminal of the first controller.

9. A DC soldering power supply circuit for a PCB board according to claim 5, characterized in that, The absorption module includes a fifth diode, a fifth capacitor, a third resistor, a sixth diode, and an energy storage device; The cathode of the fifth diode is connected to the cathode of the third diode and is connected to the anode of the sixth diode and one end of the fifth capacitor through the third resistor. The other end of the fifth capacitor is connected to the second end of the energy storage device and the emitter of the first power transistor. The cathode of the sixth diode is connected to the first end of the energy storage device and the power compensation module.

10. A DC soldering power supply circuit for a PCB board according to claim 9, characterized in that, The power compensation module includes a third power transistor and a power regulation device; The drain of the third power transistor is connected to the first terminal of the energy storage device, the source of the third power transistor is connected to the input terminal of the power regulation device, the output terminal of the power regulation device is connected to the cathode of the third diode, and the gate of the third power transistor is connected to the IO7 terminal of the first controller.

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