Welding wire control device

Abstract

The present invention relates to a wire welding control device, comprising: a first PCB board, an ignition module, which is arranged on the first PCB board; the ignition module comprises a first ignition electrode and a second ignition electrode, the first ignition electrode is used to connect a gold wire, the second ignition electrode is used to connect a ignition rod, and the ignition module is used to output a high-voltage ignition signal before welding, so as to cause breakdown discharge between the welding end of the gold wire and the ignition rod and form a gold ball at the welding end. A wire welding detection module is arranged on the first PCB board, and is used to output a detection signal to the gold wire after welding, and the detection signal is used to detect the welding effect of the gold wire. A control module is arranged on the first PCB, and is used to control the ignition module to output a high-voltage ignition signal, and control the wire welding detection module to output a detection signal.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor packaging, and in particular to a wire bonding control device. Background Art

[0002] With the rapid development of the semiconductor industry, the market demand for semiconductor packaging equipment is also increasing. Among them, the wire bonding machine is an important equipment in the field of semiconductor packaging. Its function is to use gold wire to weld the internal circuit of the wafer to the chip pins. The wire bonding machine includes an EFO (Electronic Fire Off) ignition and burning ball control box, and an NSB / BSD (NonStick Bond / Bon Stick Detection) detection box. The EFO ignition and burning ball control box is used to burn the gold wire ball, making it easy to weld the gold wire to the wafer electrode, and the NSB / BSD detection box is used to detect the solder joints to determine whether the gold wire is welded to the wafer.

[0003] In practice, the inventors found that the EFO ignition and burning ball control box and the NSB / BSD detection box have many electrical wirings and complex connections, which are not conducive to the production and maintenance of the wire welding machine. Summary of the invention

[0004] Based on this, it is necessary to

[0005] An embodiment of the present invention provides a welding wire control device, characterized by comprising:

[0006] First PCB board,

[0007] The ignition module is arranged on the first PCB board; the ignition module includes a first ignition electrode and a second ignition electrode, the first ignition electrode is used to connect the gold wire, and the second ignition electrode is used to connect the ignition rod, and the ignition module is used to output a high-voltage AC ignition signal before welding, so as to cause breakdown discharge between the welding end of the gold wire and the ignition rod and form a gold ball at the welding end;

[0008] A wire bonding detection module is provided on the first PCB board and is used to output a detection signal to the gold wire after bonding, and the detection signal is used to detect the bonding effect of the gold wire;

[0009] The control module is arranged on the first PCB and is used to control the ignition module to output a high-voltage ignition signal and to control the welding wire detection module to output a detection signal.

[0010] In one embodiment, the welding wire control device further includes a second PCB board, the first PCB board is provided with a first mounting portion, the second PCB board is mounted on the first mounting portion, and the control module and the welding wire detection module are both arranged on the second PCB board.

[0011] In one of the embodiments, a transformer module is further provided on the first PCB board for converting the power supply voltage and providing corresponding working voltages to the ignition module, the welding wire detection module and the control module respectively.

[0012] In one embodiment, the transformer module includes an industrial frequency transformer and a rectifier and filter circuit; the industrial frequency transformer is used to convert the voltage of the industrial frequency power supply, and the rectifier and filter circuit is used to rectify and filter the voltage converted by the industrial frequency transformer and output it to the ignition module, the welding wire detection module and the control module respectively.

[0013] In one embodiment, the welding wire control device also includes a relay, the first switch end of the relay is used to connect the gold wire, the second switch end is connected to the first ignition electrode, the third switch end is connected to the output end of the welding wire detection module, and the control end is connected to the control module; the relay is used to select to turn on the first switch end and the second switch end, or to select to turn on the first switch end and the third switch end under the control of the control module.

[0014] In one embodiment, the welding wire control device further includes a third PCB board, and a second mounting portion is further provided on the first PCB board; the third PCB board is installed on the second mounting portion, and the ignition module is provided on the third PCB board.

[0015] In one of the embodiments, the welding wire control device is further provided with a shielding box, which is fixed on the first PCB board; the third PCB board and the ignition module are both arranged in the shielding box.

[0016] In one of the embodiments, an indicator light is provided on the first PCB board, and the indicator light is electrically connected to the control module.

[0017] In one of the embodiments, the first mounting portion is provided with a double-row bent female connector, and the second PCB board is connected to the first PCB board via the double-row bent female connector.

[0018] In one embodiment, the control module is also used to connect to a host computer, and is used to control the operation of the ignition module and the welding wire detection module according to a control signal from the host computer.

[0019] The above-mentioned welding wire control device realizes the integration of EFO ignition and ball burning and NSD / BSD detection functions by arranging both the ignition module and the welding wire detection module on the first PCB board, that is, one control device realizes ignition and ball burning control and non-stick detection control, which reduces the hardware cost of discrete devices, saves complex wiring between discrete devices, improves production efficiency, and facilitates maintenance and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a module of a wire bonding control device according to an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a module of a wire bonding control device according to another embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a module of a wire bonding control device according to an embodiment of the present invention;

[0023] Figure 4 The figure is a schematic structural diagram of a welding wire control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to better understand the purpose, technical solution and technical effect of the present invention, the present invention is further explained below in conjunction with the accompanying drawings and embodiments. At the same time, it is stated that the embodiments described below are only used to explain the present invention and are not used to limit the present invention.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a welding wire control device, including a first PCB (Printed Circuit Board) board 1, an ignition module 2, a welding wire detection module 3 and a control module 4.

[0026] Among them, the first PCB board 1 is used to provide a layout space for electronic components. The first PCB board 1 is provided with a printed circuit wiring, and the printed circuit wiring is used to connect the various electronic components arranged on the first PCB board 1. Optionally, the first PCB board 1 can adopt a single-layer board, that is, the first PCB board 1 is only provided with one layer of printed circuit wiring, and the electronic components are concentrated on one side of the first PCB board 1. Optionally, the first PCB board 1 can also adopt a double-layer board, that is, two layers of printed circuit wiring are provided on the first PCB board 1, and the electronic components can be concentrated on one side of the first PCB board 1, or electronic components can be provided on both sides of the first PCB board 1 according to actual conditions. Of course, the first PCB board 1 can also adopt a multi-layer board, that is, the first PCB board 1 is provided with more than two layers of printed circuit wiring, which can increase the wiring area and improve the integration of the device.

[0027] The ignition module 2 is arranged on the first PCB board 1, and is used to ignite the gold wire 6, so that the welding end of the gold wire 6 forms a gold ball, which is convenient for welding. The ignition module 2 includes a first ignition electrode and a second ignition electrode. The first ignition electrode is used to connect the gold wire 6, and the second ignition electrode is used to connect the ignition rod 5. The ignition module 2 applies high voltage between the first ignition electrode and the second ignition electrode, so that the air between the ignition rod 5 and the gold wire 6 is broken through to form a discharge circuit. The high temperature generated by the discharge causes the end of the gold wire 6, that is, the welding end of the gold wire 6 to melt to form a gold ball, that is, a free air ball (Free Air Ball, FAB). The role of the gold ball is to increase the contact area between the gold wire 6 and the welding part to improve the welding success rate and reduce the contact resistance of the welding. Therefore, the quality of the gold ball will affect the quality of the welding wire. Optionally, the first ignition electrode is used to connect the gold wire 6, which can be a direct connection, that is, the first ignition electrode directly contacts the gold wire 6 to achieve a conductive connection; or it can be an indirect connection, that is, the first ignition electrode and the gold wire 6 are respectively connected to a common potential or a common conductor, for example, the first ignition electrode and the gold wire 6 are grounded together, or the first ignition electrode and the gold wire 6 are connected to an external common electrode. Similarly, the second ignition electrode is used to connect the ignition rod 5, which can also be a direct connection or an indirect connection, which will not be repeated again.

[0028] Optionally, the ignition module 2 can be set to perform positive voltage electronic ignition, that is, the second ignition electrode outputs a high voltage, and the first ignition electrode outputs a low voltage, so that the ignition rod 5 is at a positive voltage relative to the gold wire 6. During breakdown ignition, positively charged gas ions bombard the gold wire 6 to form a conductive loop, generating a high temperature to form a gold ball at the end of the gold wire 6. The ignition module 2 can also be set to perform negative voltage electronic ignition, that is, the second ignition electrode outputs a low voltage, and the first ignition electrode outputs a high voltage, so that the ignition rod 5 is at a negative voltage relative to the gold wire 6. During breakdown ignition, positively charged gas ions bombard the ignition rod 5 to form a conductive loop, generating a high temperature to form a gold ball at the end of the gold wire 6. Optionally, when setting negative voltage electronic ignition, the gold wire 6 can be grounded, that is, the first ignition electrode is grounded, and the second ignition electrode outputs a negative high voltage, so that the ignition rod 5 is at a negative voltage relative to the gold wire 6 for ignition. Negative voltage electronic ignition can reduce the sputtering of molten gold caused by ion bombardment of the gold wire 6, and prevent the sputtered molten gold from damaging the transmission mechanism of the gold wire 6; in addition, negative voltage electronic ignition can also make the size of the gold ball easier to control, thereby improving the consistency of the size of the gold ball.

[0029] The wire bonding detection module 3 is arranged on the first PCB board 1, and is used to output a detection signal to the gold wire 6, and the detection signal is used to detect whether the gold wire 6 is welded to the welding part. Optionally, a feedback end can be set to feedback the detection signal, and the welding effect of the gold wire 6 can be judged according to the feedback result. After the gold wire 6 is welded to the welding part, the equivalent resistance and equivalent capacitance of the gold wire 6 and the welding part are different from the equivalent resistance and equivalent capacitance of the gold wire 6 not welded to the welding part, which makes the detection signal change before and after the gold wire 6 is welded to the welding part. Optionally, the detection signal received by the gold wire 6 can be sampled and detected, and it is judged whether the gold wire 6 has been welded to the welding part according to the change of the detection signal. Optionally, the output end of the welding detection module can also be sampled and fed back inside the wire bonding detection module 3, and it is judged whether the gold wire 6 has been welded to the welding part according to the change of the detection signal according to the same principle. Optionally, after sampling the detection signal, it can be judged whether the welding is successful manually, or it can be automatically judged by combining the control chip with a preset program.

[0030] The control module 4 is any device capable of controlling the operation of the ignition module 2 and the wire detection module 3. For example, the control module 4 can be configured as a control chip or a microprocessor to control the ignition module 2 and the wire detection module 3; for another example, the control module 4 can also be configured as a control switch capable of independently controlling the operation of the ignition module 2 and the wire detection module 3, and manually controlling the operation of the ignition module 2 and the wire detection module 3. Of course, when the control module 4 is configured as a control chip or a microprocessor, in order to improve the hardware integration, the control chip or the microprocessor can also be configured to process the feedback result of the detection signal of the wire detection module 3, and determine whether the gold wire 6 is welded to the welding part, thereby saving hardware costs.

[0031] The wire welding control device provided by the embodiment of the present invention integrates the ignition module 2 and the wire welding detection module 3 on the same PCB board, realizing the integration of the EFO ignition and burning ball and wire welding detection functions. Compared with the traditional solution of separately arranging the ignition module 2 and the wire welding detection module 3, it also saves the external connection of the separate ignition module 2 and the wire welding detection module 3, saves hardware costs, improves production efficiency, and facilitates maintenance and management.

[0032] refer to Figure 2As shown, in one embodiment, the welding wire control device also includes a second PCB board 7. The first PCB board 1 is provided with a first mounting portion, and the second PCB board 7 is mounted on the first PCB board 1 through the first mounting portion. Among them, the control module 4 and the welding wire detection module 3 are both arranged on the second PCB board 7. Among them, the first mounting portion can be a fixed structure on the first PCB board 1, such as a screw hole or a welding hole for matching and connecting with other PCB boards is opened on the first PCB board 1. The first mounting portion can also be a connector arranged on the first PCB board 1 for fixing other PCB boards, such as a female connector can be arranged on the first PCB board 1, and a male connector corresponding to the female connector is arranged on the second PCB board 7, and the female connector and the male connector cooperate with each other to fix the first PCB board 1 and the second PCB board 7. It is also possible to set a female socket slot on the first PCB board 1, and the second PCB board 7 is provided with a matching gold finger plug-in end corresponding to the female socket slot, and is installed on the first PCB board 1 in a plug-in manner. Optionally, the second PCB board 7 is vertically fixedly installed on the first PCB board 1 through a connector, and is perpendicular to the first PCB board 1. By arranging the control module 4 and the welding wire detection module 3 on the second PCB board 7, the spatial layout is fully utilized, the occupied area of ​​a single PCB board is saved, the difficulty of PCB board manufacturing is reduced, and the manufacturing cost is saved. At the same time, since the ignition module 2 generates high-voltage discharge for ignition, it is a high-voltage module. By arranging the welding wire detection module 3 and the control module 4 on the second PCB board 7, the low-voltage module can be separated from the high-voltage module, reducing the influence between the high and low voltage modules.

[0033] refer to Figure 3 As shown, in one embodiment, a transformer module is further provided on the first PCB board 1. The transformer module is used to convert the voltage of the power supply 91, and provide corresponding working voltages to the ignition module 2, the welding wire detection module 3 and the control module 4 respectively. Optionally, the transformer module may include a plurality of transformer units, such as a first transformer unit, a second transformer unit and a third transformer unit, the first transformer unit provides the corresponding working voltage to the ignition module 2, the second transformer unit provides the corresponding working voltage to the welding wire detection module 3, and the third transformer unit provides the corresponding working voltage to the control module 4. Optionally, the transformer module may also include a transformer unit with multiple outputs, such as the transformer module may be configured as a transformer chip with multiple outputs, the first output of the transformer chip provides the corresponding working voltage to the ignition module 2, the second output provides the corresponding working voltage to the welding wire detection module 3, and the third output provides the corresponding working voltage to the control module 4. In the embodiment of the present invention, a transformer module is arranged on the first PCB board 1 to uniformly manage the external power supply 91, thereby eliminating the need to connect multiple power supplies 91 to supply power to the ignition module 2, the welding wire detection module 3 and the control module 4 respectively, thereby simplifying the external connection and improving the welding wire operation efficiency.

[0034] In one embodiment, the transformer module includes an industrial frequency transformer 11 and a rectifier filter circuit 12. The industrial frequency transformer 11 is a transformer capable of performing voltage conversion on the industrial frequency power supply, and is used to perform voltage conversion on the industrial frequency power supply, thereby providing power supply voltages that match the ignition module 2, the welding wire detection module 3, and the control module 4, respectively. The industrial frequency power supply includes a 50Hz power supply and a 60Hz power supply. The rectifier filter circuit 12 is used to rectify and filter the voltage converted by the industrial frequency transformer 11, and output the rectified and filtered voltages to the ignition module 2, the welding wire detection module 3, and the control module 4, respectively. Optionally, the industrial frequency transformer 11 converts the industrial frequency power supply into a first voltage for supplying power to the ignition module 2, a second voltage for supplying power to the welding wire detection module 3, and a third voltage for supplying power to the control module 4, and the rectifier filter circuit 12 rectifies and filters the voltage converted by the industrial frequency transformer 11, that is, outputs the rectified and filtered first voltage to the ignition module 2, outputs the rectified and filtered second voltage to the welding wire detection module 3, and outputs the sorted and filtered third voltage to the control module 4.

[0035] In one embodiment, the welding wire control device further includes a relay 14. The relay 14 is used to select switching to the ignition module 2 to work or to select switching to the welding wire detection module 3 to work, that is, the ignition module 2 and the welding wire detection module 3 are both connected to the gold wire 6 through the relay 14. Among them, the first switch end of the relay 14 is used to connect the gold wire 6, the second switch end of the relay 14 is connected to the first ignition electrode, the third switch end of the relay 14 is connected to the output end of the welding wire detection module 3, and the control end of the relay 14 is connected to the control module 4. Under the control of the control module 4, the relay 14 selects to turn on the first switch end and the second switch end so that the first ignition electrode ignites the gold wire 6 to achieve the burning of the gold wire 6; or selects to turn on the first switch end and the third switch end so that the welding wire detection module 3 sends a detection signal to the gold wire 6 to achieve welding wire detection.

[0036] In one embodiment, the welding wire control device further includes a third PCB board 8. A second mounting portion is further provided on the first PCB board 1, the third PCB board 8 is mounted on the second mounting portion, and the ignition module 2 is arranged on the third PCB board 8. The second mounting portion may be a fixed structure on the first PCB board 1, such as a screw hole or a welding hole for matching and connecting with other PCB boards is provided on the first PCB board 1. The second mounting portion may also be a connector provided on the first PCB board 1 for fixing other PCB boards, such as a female connector may be provided on the first PCB board 1, and a male connector corresponding to the female connector may be provided on the third PCB board 8, and the female connector and the male connector cooperate with each other to fix the first PCB board 1 and the third PCB board 8 together; a female socket may also be provided on the first PCB board 1, and a matching gold finger plug-in end may be provided on the third PCB board 8 corresponding to the female socket, and the third PCB board 8 may be installed on the first PCB board 1 in a plug-in manner. Optionally, the first PCB board 1 is provided with a mounting hole, and the third PCB board 8 is installed on the mounting hole through a fixing column, so as to realize a fixed connection between the first PCB board 1 and the third PCB board 8, and the first PCB board 1 is parallel to the third PCB board 8. The third PCB board 8 is mounted on the first PCB board 1, making full use of the three-dimensional space, saving the occupied area of ​​a single PCB board, reducing the difficulty of PCB board manufacturing, and saving manufacturing costs. At the same time, the ignition module 2 is arranged on the third PCB board 8, realizing the separation between the high voltage module and the low voltage module, and reducing the influence between the high and low voltage modules.

[0037] In one embodiment, the ignition module 2 is further provided with a shielding box 21. The shielding box 21 is fixed on the first PCB board 1, and the third PCB board 8 and the ignition module 2 are both arranged in the shielding box 21. The shielding box 21 is installed on the mounting hole of the first PCB through a fixing column. Optionally, the ignition module 2 is electrically connected to the first PCB board 1 through a connector, and the control module 4 and the welding wire detection module 3 are both electrically connected to the first PCB board 1 through corresponding connectors. The ignition module 2, the control module 4 and the welding wire detection module 3 are indirectly electrically connected through the first PCB board 1 to achieve communication among the three. In the embodiment of the present invention, the ignition module 2 and the third PCB board 8 are arranged in the shielding box to separate the high and low voltage signals, and the shielding box shields the electromagnetic interference generated by the high voltage of the ignition module 2, thereby improving the electromagnetic compatibility characteristics between the modules of the welding wire control device.

[0038] In one embodiment, an indicator light is also provided on the first PCB board 1, and the indicator light is electrically connected to the control module 4. The indicator light is used to indicate the working status of each module of the wire bonding control device according to the command of the control module 4.

[0039] In one embodiment, the first mounting portion is provided with a double-row bent female plug, and the second PCB board 7 is connected to the first PCB board 1 through the double-row bent female plug. The double-row bent female plug is a 2×25PIN bent female plug.

[0040] In one embodiment, the control module 4 is further used to connect to the host computer 92 , and the control module 4 is used to control the ignition module 2 and the welding wire detection module 3 to work according to the control signal of the host computer 92 .

[0041] In one embodiment, the first PCB board 1 has a size of 200 mm in length and 192 mm in width. Optionally, the second PCB board 7 has a size of 202.5 mm in length and 80 mm in width. Optionally, the third PCB board 8 has a size of 125 mm in length and 96 mm in width. Optionally, the shielding box has a size of 138.5 mm in length, 104.5 mm in width and 63 mm in height.

[0042] In one embodiment, the welding wire control device also includes a shell, and each component including a first PCB board 1, a second PCB board 7, a third PCB board 8, a control module 4, an ignition module 2 and a welding wire detection module 3 is arranged in the shell. Optionally, the size of the shell is 282mm long, 213mm wide and 97mm high. The shell includes a bottom plate and a front plate, and the first PCB board 1 is fixed to the bottom plate through a fixing hole. The bottom plate is also provided with a PCB fixing column, which extends from the bottom plate to the inside of the shell and passes through the first PCB board 1. A fixing hole is provided at the end of the PCB fixing column, and the second PCB is fixedly connected to the fixing hole through a stud. A DB25 connector 13 is also provided on the second PCB board 7, and the control module 4 is connected to the host computer 92 through the DB25 connector 13 for communication. At the same time, a plug screw is provided on the DB25 connector 13, and the second PCB board 7 is fixed to the front plate of the shell through the plug screw of the DB25 connector 13. Optionally, the power frequency transformer 11 is connected to the first PCB board 1 through a minifit connector, and provides corresponding voltages to the ignition module 2, the welding wire detection module 3 and the control module 4 through the wiring of the first PCB board 1. Optionally, the ignition module 2 is connected to the first PCB board 1 through a double-row pointer, and receives the control signal from the control module 4 through the wiring of the first PCB board 1, and receives the power supply voltage from the power frequency transformer 11. Optionally, the indicator light set on the second PCB board 7 adopts an LED indicator light with eight lamp holders, and the outer dimensions of the indicator light are 4.4mm×6.3mm×7.5mm. Optionally, a double-row straight-plug mother row is also provided on the second PCB board 7, and the double-row straight-plug mother row is used to connect the second PCB board 7 and the welding wire detection module 3, and fix the welding wire detection module 3 on the second PCB board 7. Optionally, the specification of the double-row straight-plug mother row is 2×18PIN mother row, and the pinhole spacing is 2.54mm.

[0043] Optionally, a controllable constant current source circuit is further provided on the first PCB board 1, which is used to maintain the conduction between the ignition rod 5 and the gold wire 6 after the ignition rod 5 and the gold wire 6 are discharged and broken down, and output a constant conduction current to make the gold wire 6 form a burnt ball. The first PCB board 1 is also provided with a sampling feedback circuit, which is used to sample the conduction current after the ignition rod 5 and the gold wire 6 are discharged and broken down and feedback to the control module 4, so that the control module 4 maintains the conduction current as a preset current value. Optionally, the power frequency transformer 11 converts the input power frequency 220V power supply into 445V, 60V and 13V AC power supplies, wherein the 13V AC power supply is rectified, filtered and stabilized by the rectifier and filter circuit 12, and then outputs a 12V DC voltage to the controllable constant current source circuit and the sampling feedback circuit, and supplies power to the controllable constant current source circuit and the sampling feedback circuit. After rectification and filtering, the 445V and 60V voltages are output to the ignition module 2 to supply power to the ignition module 2.

[0044] Optionally, a pulse width modulation circuit (PWM) is also provided on the first PCB board 1. The ignition module 2 includes a push-pull inverter circuit. The control module 4 includes a dsPIC33F chip and its peripheral circuits. The control module 4 communicates with the host computer 92 through a DB25 interface. After receiving the ignition control signal from the host computer 92, the control module 4 controls the pulse width modulation circuit to output a dual-channel complementary modulation pulse drive signal to the push-pull inverter circuit, controls the push-pull inverter circuit to output high-frequency high-voltage alternating current, and outputs a high-voltage ignition voltage to the first ignition electrode and the second ignition electrode after rectification and filtering, so as to achieve breakdown discharge between the ignition rod 5 and the gold wire 6. At the same time, the control module 4 also controls the corresponding peripheral circuit to perform digital-to-analog conversion according to the preset ignition parameters such as the ignition voltage and the ball burning current, and outputs the converted analog signal to the controllable constant current source circuit and the feedback sampling circuit. When the ignition rod 5 and the gold wire 6 break down and discharge, the controllable constant current source is started to control the ignition rod 5 and the gold wire 6 to maintain conduction with the preset ball burning current, so as to burn the gold wire 6. After the preset ball burning time is continued, the ball burning of the gold wire 6 is completed. During the welding process of the gold wire 6, after the first welding is completed, the control module 4 starts the welding wire detection module 3 to detect the welding of the gold wire 6. Optionally, if the first welding is normal, the gold wire 6 and the welded part will form a loop, so that the detection signal output by the welding wire detection module 3 changes. For example, the welding part can be grounded. If the gold wire 6 and the welding part are welded normally, then a resistor is connected between the gold wire 6 and the ground to form a loop, thereby lowering the output detection signal voltage. At this time, the detection module samples the voltage of the detection signal. If the voltage of the detection signal is lower than the preset voltage threshold, it is determined that the first welding is normal. If the voltage of the detection signal is higher than the preset voltage threshold, it is determined that the first welding is abnormal. Optionally, the welding state can be indicated by an indicator light. Optionally, the pulse width modulation circuit is a TL494 pulse width modulation circuit.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A welding wire control device, characterized in that: include: First PCB board, a second PCB board, wherein the first PCB board is provided with a first mounting portion, and the second PCB board is mounted on the first mounting portion; An ignition module is arranged on the first PCB board; the ignition module comprises a first ignition electrode and a second ignition electrode, the first ignition electrode is used to connect the gold wire, the second ignition electrode is used to connect the ignition rod, and the ignition module is used to output a high-voltage AC ignition signal before welding, so as to cause breakdown discharge between the welding end of the gold wire and the ignition rod and form a gold ball at the welding end; A wire bonding detection module, arranged on the second PCB board, for outputting a detection signal to the gold wire after welding, wherein the detection signal is used to detect the welding effect of the gold wire; A control module, disposed on the second PCB board, for controlling the ignition module to output the high-voltage ignition signal, and controlling the welding wire detection module to output the detection signal; When setting negative voltage electronic ignition, the gold wire is grounded, that is, the first ignition electrode is grounded, and the second ignition electrode outputs negative high voltage, so that the ignition rod is ignited at a negative voltage relative to the gold wire, reducing the sputtering of molten gold caused by ion bombardment on the gold wire, and avoiding the sputtered molten gold from damaging the gold wire transmission mechanism; negative voltage electronic ignition makes the size of the gold ball easier to control and improves the consistency of the size of the gold ball.

2. The welding wire control device according to claim 1, characterized in that: The first PCB board is also provided with a voltage transformation module for converting the power supply voltage and providing corresponding working voltages to the ignition module, the welding wire detection module and the control module respectively.

3. The welding wire control device according to claim 2, characterized in that: The transformer module includes an industrial frequency transformer and a rectifier and filter circuit; the industrial frequency transformer is used to convert the voltage of the industrial frequency power supply, and the rectifier and filter circuit is used to rectify and filter the voltage converted by the industrial frequency transformer and output it to the ignition module, the welding wire detection module and the control module respectively.

4. The welding wire control device according to claim 2, characterized in that: It also includes a relay, wherein the first switch end of the relay is used to connect the gold wire, the second switch end is connected to the first ignition electrode, the third switch end is connected to the output end of the welding wire detection module, and the control end is connected to the control module; The relay is used to selectively conduct the first switch end and the second switch end, or selectively conduct the first switch end and the third switch end under the control of the control module.

5. The welding wire control device according to any one of claims 1 to 4, characterized in that: It also includes a third PCB board, and the first PCB board is also provided with a second mounting portion; the third PCB board is installed on the second mounting portion, and the ignition module is arranged on the third PCB board.

6. The welding wire control device according to claim 5, characterized in that: A shielding box is also provided, and the shielding box is fixed on the first PCB board; the third PCB board and the ignition module are both arranged in the shielding box.

7. The welding wire control device according to claim 6, characterized in that: An indicator light is disposed on the first PCB board, and the indicator light is electrically connected to the control module.

8. The welding wire control device according to claim 7, characterized in that: The first mounting portion is provided with a double-row bent female plug, and the second PCB board is connected to the first PCB board via the double-row bent female plug.

9. The welding wire control device according to claim 8, characterized in that: The control module is also used to connect to a host computer, and is used to control the operation of the ignition module and the welding wire detection module according to a control signal from the host computer.

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