Welding wire detection method, circuit and welding wire machine

Abstract

The invention provides a welding wire detection method and circuit and a welding wire machine, and the method comprises the steps: sampling the voltage and current outputted by an ignition discharge loop in the working process of the welding wire machine; determining a voltage sampling maximum value, a voltage sampling minimum value, a current sampling maximum value and a current sampling minimum value; and determining the working state of the wire welding machine according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value. In the embodiment of the invention, in the working process of the wire bonder, the voltage output state and the current output state of the ignition and discharge loop are determined by sampling the voltage and the current output by the ignition and discharge loop, so that the working state of the wire bonder is determined from the two aspects of the output voltage and the output current of the wire bonder, and the welding wire detection precision is further improved.

Description

Technical Field

[0001] The present application relates to the field of intelligent manufacturing technology, and in particular to a wire bonding detection method, circuit and wire bonding machine. Background Art

[0002] In the field of intelligent manufacturing technology, wire bonding machine is a machine mainly used for welding the inner leads of high-power devices, MOS tubes, light-emitting diodes, laser tubes, small and medium-sized power transistors, integrated circuits and some special semiconductor devices.

[0003] During the wire bonding process of the wire bonding machine, negative high voltage is used to break through the air to form a current channel, and the negative pressure environment for a period of time generates a constant current to quickly melt the end of the gold wire into a ball. When foreign matter or stains are attached to the end of the gold wire, it will cause fluctuations in the constant current voltage for rapid ball formation, affecting the ball quality and producing defective balls. In the prior art, the current during the operation of the wire bonding machine is usually sampled, and the wire bonding detection is achieved through the current size.

[0004] However, bad balls may also be caused by other working factors. The existing technology only detects the working current of the wire bonding machine, which has the technical problem of low detection accuracy. Summary of the invention

[0005] The main purpose of the present application is to provide a wire bonding detection method, circuit and wire bonding machine, aiming to solve the technical problem of low detection accuracy in existing wire bonding detection methods.

[0006] To achieve the above object, the present application provides a welding wire detection method, which is applied to a welding wire machine, wherein the welding wire machine includes an ignition discharge circuit, and the method includes:

[0007] During the operation of the wire bonding machine, sampling the voltage and current output by the ignition discharge circuit;

[0008] Determine the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value;

[0009] The working state of the wire bonding machine is determined according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value.

[0010] Optionally, determining the working state of the wire bonding machine according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value, and the current sampling minimum value includes:

[0011] Determining a voltage output state of the wire bonding machine according to the voltage sampling maximum value and the voltage sampling minimum value;

[0012] Determining a current output state of the wire bonding machine according to the current sampling maximum value and the current sampling minimum value;

[0013] When the voltage output state of the wire bonding machine is abnormal and / or the current output state of the wire bonding machine is abnormal, it is determined that the wire bonding machine is operating abnormally.

[0014] Optionally, determining the voltage output state of the wire bonding machine according to the voltage sampling maximum value and the voltage sampling minimum value includes:

[0015] Calculating a voltage sampling difference between the voltage sampling maximum value and the voltage sampling minimum value;

[0016] When the voltage sampling difference is greater than or equal to the voltage threshold, determining that the voltage output state of the wire bonding machine is abnormal;

[0017] When the voltage sampling difference is less than the voltage threshold, it is determined that the voltage output state of the wire bonding machine is normal.

[0018] Optionally, the method further comprises:

[0019] During the operation of the wire bonding machine, and when the working state of the wire bonding machine is normal, detecting the maximum voltage value and the minimum voltage value output by the ignition discharge circuit;

[0020] Calculating a voltage detection difference between the maximum voltage value and the minimum voltage value;

[0021] The voltage threshold is determined according to the voltage detection difference.

[0022] Optionally, determining the current output state of the wire bonding machine according to the current sampling maximum value and the current sampling minimum value includes:

[0023] Calculating a current sampling difference between the current sampling maximum value and the current sampling minimum value;

[0024] When the current sampling difference is greater than or equal to the current threshold, determining that the current output state of the wire bonding machine is abnormal;

[0025] When the current sampling difference is less than the current threshold, it is determined that the current output state of the wire bonding machine is normal.

[0026] Optionally, the method further comprises:

[0027] During the operation of the wire bonding machine, and when the working state of the wire bonding machine is normal, detecting the maximum current value and the minimum current value output by the ignition discharge circuit;

[0028] calculating a current detection difference between the maximum current value and the minimum current value;

[0029] The current threshold is determined according to the current detection difference.

[0030] In addition, to achieve the above-mentioned purpose, the present application also provides a bonding wire detection circuit, the bonding wire detection circuit comprising a micro control unit, a current sampling circuit and a voltage sampling circuit;

[0031] The input end of the current sampling circuit is electrically connected to the current sampling end of the ignition discharge circuit, the output end of the current sampling circuit is electrically connected to the first input end of the micro control unit, the input end of the voltage sampling circuit is electrically connected to the voltage sampling end of the ignition discharge circuit, the output end of the voltage sampling circuit is electrically connected to the second input end of the micro control unit, and the output end of the micro control unit is electrically connected to the signal input end of the ignition discharge circuit;

[0032] Wherein, the current sampling circuit is used to sample the current output by the ignition discharge circuit during the operation of the wire welding machine;

[0033] The voltage sampling circuit is used to sample the voltage output by the ignition discharge circuit during the operation of the wire bonding machine;

[0034] The micro control unit is used to determine the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value;

[0035] The working state of the wire bonding machine is determined according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value.

[0036] Optionally, the voltage sampling circuit includes a DC voltage divider, an inverting amplifier and an AD converter, and the current sampling circuit includes a current sampling subcircuit and an AD converter.

[0037] Optionally, the bonding wire detection circuit further includes a negative high voltage control circuit, a negative high voltage high frequency transformer, a negative low voltage drive circuit, a negative low voltage high frequency transformer, a DA converter and a constant current control circuit;

[0038] The input end of the negative high voltage control circuit is electrically connected to the pulse signal output end of the micro control unit, the output end of the negative high voltage control circuit is electrically connected to the input end of the negative high voltage high frequency transformer, and the output end of the negative high voltage high frequency transformer is electrically connected to the first signal input end of the ignition discharge circuit;

[0039] The input end of the negative low-voltage drive circuit is electrically connected to the PWM signal output end of the micro control unit, the output end of the negative low-voltage drive circuit is electrically connected to the first input end of the negative low-voltage high-frequency transformer, the input end of the DA converter is electrically connected to the signal output end of the micro control unit, the output end of the DA converter is electrically connected to the input end of the constant current control circuit, the output end of the constant current control circuit is electrically connected to the second input end of the negative low-voltage high-frequency transformer, and the output end of the negative low-voltage high-frequency transformer is electrically connected to the second signal input end of the ignition discharge circuit.

[0040] In addition, to achieve the above-mentioned purpose, the present application also provides a wire bonding machine, which includes a wire bonding detection circuit configured to implement the above-mentioned wire bonding detection method, and an ignition discharge circuit.

[0041] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0042] The present application provides a wire welding detection method, circuit and wire welding machine, the method comprising: sampling the voltage and current output by the sparking discharge circuit during the operation of the wire welding machine; determining the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value; determining the working state of the wire welding machine according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value. In the embodiment of the present application, during the operation of the wire welding machine, the voltage output state and the current output state of the sparking discharge circuit are determined by sampling the voltage and current output of the sparking discharge circuit, so as to determine the working state of the wire welding machine from the output voltage and output current of the wire welding machine, thereby improving the accuracy of wire welding detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 is a flow chart of a welding wire detection method provided in an embodiment of the present application;

[0045] Figure 2 is an application flow chart of the welding wire detection method provided in an embodiment of the present application;

[0046] Figure 3 is one of the circuit diagrams of the bonding wire detection circuit provided in the embodiment of the present application;

[0047] Figure 4This is the second circuit diagram of the bonding wire detection circuit provided in the embodiment of the present application. DETAILED DESCRIPTION

[0048] All technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0051] like Figure 1 As shown, the present application provides a welding wire detection method, which is applied to a welding wire machine, the welding wire machine includes an ignition discharge circuit, and the above method includes:

[0052] S110, during the operation of the wire welding machine, sampling the voltage and current output by the ignition discharge circuit.

[0053] In an optional application scenario, the welding wire detection method provided in the embodiment of the present application can be applied to a welding wire detection circuit, which is electrically connected to an ignition discharge circuit. It should be understood that the welding wire machine includes an electronic ignition system, and the ignition discharge circuit is a working circuit of the electronic ignition system.

[0054] In this step, the wire bonding detection circuit includes a sampling circuit. During the operation of the wire bonding machine, the voltage and current output by the ignition discharge circuit are sampled through the sampling circuit.

[0055] S120, determining a voltage sampling maximum value, a voltage sampling minimum value, a current sampling maximum value, and a current sampling minimum value.

[0056] In this step, in the process of sampling the voltage and current output by the ignition discharge circuit, the voltage sampling value and the current sampling value are obtained, and the maximum value among the voltage sampling values ​​is determined as the voltage sampling maximum value, and the minimum value among the voltage sampling values ​​is determined as the voltage sampling minimum value; the maximum value among the current sampling values ​​is determined as the current sampling maximum value, and the minimum value among the current sampling values ​​is determined as the current sampling minimum value.

[0057] An optional implementation is to detect the voltage and current values ​​output by the ignition discharge circuit in real time through a sampling circuit, and update the voltage sampling maximum value, voltage sampling minimum value, current sampling maximum value and current sampling minimum value.

[0058] S130, determining the working state of the wire bonding machine according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value, and the current sampling minimum value.

[0059] In this step, after determining the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value, the voltage working state of the wire bonding machine can be determined according to the voltage sampling maximum value and the voltage sampling minimum value, and the current working state of the wire bonding machine can be determined according to the current sampling maximum value and the current sampling minimum value; and then the working state of the wire bonding machine can be determined according to the voltage working state and the current working state. For specific implementation methods, please refer to the subsequent embodiments.

[0060] In an embodiment of the present application, during the operation of the wire bonding machine, the voltage and current output by the ignition discharge circuit are sampled to determine the voltage output state and the current output state of the ignition discharge circuit, thereby determining the working state of the wire bonding machine from the output voltage and the output current of the wire bonding machine, thereby improving the wire bonding detection accuracy.

[0061] Optionally, determining the working state of the wire bonding machine according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value, and the current sampling minimum value includes:

[0062] Determining a voltage output state of the wire bonding machine according to the voltage sampling maximum value and the voltage sampling minimum value;

[0063] Determining a current output state of the wire bonding machine according to the current sampling maximum value and the current sampling minimum value;

[0064] When the voltage output state of the wire bonding machine is abnormal and / or the current output state of the wire bonding machine is abnormal, it is determined that the wire bonding machine is operating abnormally.

[0065] In this embodiment, after sampling the spark discharge circuit and obtaining the voltage sampling value of the spark discharge circuit, the maximum value among the voltage sampling values ​​is determined as the voltage sampling maximum value, and the minimum value among the voltage sampling values ​​is determined as the voltage sampling minimum value, and then the voltage output state of the wire bonding machine is determined according to the voltage sampling maximum value and the voltage sampling minimum value. It should be understood that the voltage output state of the wire bonding machine can characterize whether the output voltage of the wire bonding machine is abnormal.

[0066] After sampling the spark discharge circuit and obtaining the current sampling value of the spark discharge circuit, the maximum value among the current sampling values ​​is determined as the current sampling maximum value, and the minimum value among the current sampling values ​​is determined as the current sampling minimum value, and then the current output state of the wire bonding machine is determined according to the current sampling maximum value and the current sampling minimum value. It should be understood that the current output state of the wire bonding machine can indicate whether the output current of the wire bonding machine is abnormal.

[0067] Optionally, when it is determined that the voltage output state of the wire bonding machine is abnormal based on the voltage sampling maximum value and the voltage sampling minimum value, it is determined that the wire bonding machine is operating abnormally, and an alarm is issued or the machine is shut down.

[0068] Optionally, when it is determined that the current output state of the wire bonding machine is abnormal based on the current sampling maximum value and the current sampling minimum value, it is determined that the wire bonding machine is operating abnormally, and an alarm is issued or the machine is shut down.

[0069] Optionally, the current output state of the wire welding machine is determined to be abnormal based on the current sampling maximum value and the current sampling minimum value, and when the current output state of the wire welding machine is determined to be abnormal based on the current sampling maximum value and the current sampling minimum value, it is determined that the wire welding machine is operating abnormally, and an alarm or shutdown is issued.

[0070] Optionally, determining the voltage output state of the wire bonding machine according to the voltage sampling maximum value and the voltage sampling minimum value includes:

[0071] Calculating a voltage sampling difference between the voltage sampling maximum value and the voltage sampling minimum value;

[0072] When the voltage sampling difference is greater than or equal to the voltage threshold, determining that the voltage output state of the wire bonding machine is abnormal;

[0073] When the voltage sampling difference is less than the voltage threshold, it is determined that the voltage output state of the wire bonding machine is normal.

[0074] In this embodiment, the voltage sampling difference between the voltage sampling maximum value and the voltage sampling minimum value is calculated, and the voltage sampling difference is compared with the voltage threshold. If the voltage sampling difference is greater than or equal to the voltage threshold, it means that the fluctuation of the output voltage is not within a reasonable range, and the voltage output state of the wire bonding machine is determined to be abnormal; if the voltage sampling difference is less than the voltage threshold, it means that the fluctuation of the output voltage is within a reasonable range, and the voltage output state of the wire bonding machine is determined to be normal.

[0075] In this embodiment, by comparing the magnitude relationship between the voltage sampling difference and the voltage threshold, it is determined whether the fluctuation of the output voltage is reasonable, and then it is accurately determined whether the working state of the wire bonding machine is abnormal according to the voltage output state.

[0076] The following describes how to set the voltage threshold:

[0077] Optionally, the method further comprises:

[0078] During the operation of the wire bonding machine, and when the working state of the wire bonding machine is normal, detecting the maximum voltage value and the minimum voltage value output by the ignition discharge circuit;

[0079] Calculating a voltage detection difference between the maximum voltage value and the minimum voltage value;

[0080] The voltage threshold is determined according to the voltage detection difference.

[0081] In this embodiment, when the wire welding machine is working normally, the maximum voltage value and the minimum voltage value output by the spark discharge circuit are detected by the sampling circuit. Optionally, the voltage value output by the spark discharge circuit within a preset time period can be detected by the sampling circuit, and the maximum value is determined as the maximum voltage value, and the minimum value is determined as the minimum voltage value.

[0082] A voltage detection difference between the maximum voltage value and the minimum voltage value is calculated, and a numerical range of the voltage detection difference is expanded to obtain a voltage threshold.

[0083] One implementation method of expanding the voltage detection difference is to determine the sum of the voltage detection difference and the preset value as the voltage threshold; another implementation method of expanding the voltage detection difference is to determine the product of the voltage detection difference and the preset value as the voltage threshold. It should be understood that the value range of the voltage detection difference can also be expanded in other ways, which are not specifically limited here.

[0084] Optionally, determining the current output state of the wire bonding machine according to the current sampling maximum value and the current sampling minimum value includes:

[0085] Calculating a current sampling difference between the current sampling maximum value and the current sampling minimum value;

[0086] When the current sampling difference is greater than or equal to the current threshold, determining that the current output state of the wire bonding machine is abnormal;

[0087] When the current sampling difference is less than the current threshold, it is determined that the current output state of the wire bonding machine is normal.

[0088] In this embodiment, the current sampling difference between the current sampling maximum value and the current sampling minimum value is calculated, and the current sampling difference is compared with the current threshold value. If the current sampling difference is greater than or equal to the current threshold value, it means that the fluctuation of the output current is not within a reasonable range, and it is determined that the current output state of the wire bonding machine is abnormal; if the current sampling difference is less than the current threshold value, it means that the fluctuation of the output current is within a reasonable range, and it is determined that the current output state of the wire bonding machine is normal.

[0089] In this embodiment, by comparing the magnitude relationship between the current sampling difference and the current threshold, it is determined whether the fluctuation of the output current is reasonable, and then it is accurately determined whether the working state of the wire bonding machine is abnormal according to the current output state.

[0090] The following describes how to set the current threshold:

[0091] Optionally, the method further comprises:

[0092] During the operation of the wire bonding machine, and when the working state of the wire bonding machine is normal, detecting the maximum current value and the minimum current value output by the ignition discharge circuit;

[0093] calculating a current detection difference between the maximum current value and the minimum current value;

[0094] The current threshold is determined according to the current detection difference.

[0095] In this embodiment, when the wire welding machine is working normally, the maximum current value and the minimum current value output by the spark discharge circuit are detected by the sampling circuit. Optionally, the current value output by the spark discharge circuit within a preset time period can be detected by the sampling circuit, and the maximum value is determined as the maximum current value, and the minimum value is determined as the minimum current value.

[0096] A current detection difference between the maximum current value and the minimum current value is calculated, and a numerical range of the current detection difference is expanded to obtain a current threshold value.

[0097] One implementation method of expanding the current detection difference is to determine the sum of the current detection difference and the preset value as the current threshold; another implementation method of expanding the current detection difference is to determine the product of the current detection difference and the preset value as the current threshold. It should be understood that the value range of the current detection difference can also be expanded in other ways, which are not specifically limited here.

[0098] To understand the overall technical solution, please refer to Figure 2 ,like Figure 2 As shown, when the ignition discharge circuit is working normally, the output voltage of the ignition discharge circuit is sampled to obtain the voltage sampling maximum and voltage sampling minimum, and the voltage sampling difference is calculated, and then the voltage sampling difference is compared with the voltage threshold. When the voltage sampling difference is greater than or equal to the voltage threshold, it is determined that the wire welding machine is operating abnormally.

[0099] When the ignition discharge circuit is operating normally, the output current of the ignition discharge circuit is sampled to obtain the current sampling maximum and minimum values, and the current sampling difference is calculated. Then, the current sampling difference is compared with the current threshold value. When the current sampling difference is greater than or equal to the current threshold value, it is determined that the wire welding machine is operating abnormally.

[0100] When the voltage sampling difference is smaller than the voltage threshold and the current sampling difference is also smaller than the current threshold, it is determined that the wire bonding machine is operating normally.

[0101] Further references Figure 3 , Figure 3 It is one of the circuit diagrams of the bonding wire detection circuit provided in the embodiment of the present application, the bonding wire detection circuit micro control unit, the current sampling circuit and the voltage sampling circuit provided in the present application;

[0102] The input end of the current sampling circuit is electrically connected to the current sampling end of the ignition discharge circuit, the output end of the current sampling circuit is electrically connected to the first input end of the micro control unit, the input end of the voltage sampling circuit is electrically connected to the voltage sampling end of the ignition discharge circuit, the output end of the voltage sampling circuit is electrically connected to the second input end of the micro control unit, and the output end of the micro control unit is electrically connected to the signal input end of the ignition discharge circuit;

[0103] Wherein, the current sampling circuit is used to sample the current output by the ignition discharge circuit during the operation of the wire welding machine;

[0104] The voltage sampling circuit is used to sample the voltage output by the ignition discharge circuit during the operation of the wire bonding machine;

[0105] The micro control unit is used to determine the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value;

[0106] The working state of the wire bonding machine is determined according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value.

[0107] In an embodiment of the present application, during the operation of the wire bonding machine, the voltage and current output by the ignition discharge circuit are sampled to determine the voltage output state and the current output state of the ignition discharge circuit, thereby determining the working state of the wire bonding machine from the output voltage and the output current of the wire bonding machine, thereby improving the wire bonding detection accuracy.

[0108] Optionally, the voltage sampling circuit includes a DC voltage divider, an inverting amplifier and an AD converter, and the current sampling circuit includes a current sampling subcircuit and an AD converter.

[0109] This embodiment provides a wire bonding detection circuit micro control unit, a current sampling circuit, and a voltage sampling circuit.

[0110] Optionally, the current sampling circuit includes a current sampling subcircuit and an AD converter.

[0111] The working principle of the current sampling circuit is to sample the output current of the ignition discharge circuit through the current sampling sub-circuit, and convert the sampled current into a digital signal through an AD converter, and then output it to the micro control unit.

[0112] Optionally, the voltage sampling circuit includes a DC voltage divider, an inverting amplifier and an AD converter.

[0113] The working principle of the voltage sampling circuit is to sample the output voltage of the ignition discharge circuit through a DC voltage divider and an inverting amplifier, and convert the sampled voltage into a digital signal through an AD converter, and then output it to the microcontroller unit.

[0114] In this embodiment, the sampled voltage is converted into a digital signal by a voltage sampling circuit and output to a micro control unit, and the sampled current is converted into a digital signal by a current sampling circuit and output to a micro control unit, so that the micro control unit determines the working state of the wire bonding machine.

[0115] See also Figure 4 , Optionally, the welding wire detection circuit also includes a negative high voltage control circuit, a negative high voltage high frequency transformer, a negative low voltage drive circuit, a negative low voltage high frequency transformer, a DA converter and a constant current control circuit;

[0116] The input end of the negative high voltage control circuit is electrically connected to the pulse signal output end of the micro control unit, the output end of the negative high voltage control circuit is electrically connected to the input end of the negative high voltage high frequency transformer, and the output end of the negative high voltage high frequency transformer is electrically connected to the first signal input end of the ignition discharge circuit;

[0117] The input end of the negative low-voltage drive circuit is electrically connected to the PWM signal output end of the micro control unit, the output end of the negative low-voltage drive circuit is electrically connected to the first input end of the negative low-voltage high-frequency transformer, the input end of the DA converter is electrically connected to the PWM signal output end of the micro control unit, the output end of the DA converter is electrically connected to the input end of the constant current control circuit, the output end of the constant current control circuit is electrically connected to the second input end of the negative low-voltage high-frequency transformer, and the output end of the negative low-voltage high-frequency transformer is electrically connected to the second signal input end of the ignition discharge circuit.

[0118] In this embodiment, the microcontroller unit outputs a pulse signal to the negative high-voltage control circuit, and the negative high-voltage control circuit outputs a corresponding voltage to the negative high-voltage high-frequency transformer according to the pulse signal. The negative high-voltage high-frequency transformer outputs the adjusted voltage to the ignition discharge circuit, so that the ignition discharge circuit responds to the pulse signal output by the microcontroller unit.

[0119] The microcontroller unit outputs a PWM signal to the negative low-voltage drive circuit, and the negative low-voltage control circuit outputs a corresponding voltage to the negative low-voltage high-frequency transformer according to the PWM signal; the microcontroller unit also sends a digital signal including commands and data to the DA converter, and the above data includes current output parameters and voltage output parameters. The DA converter converts the received commands and data into real voltages, and the constant current control circuit outputs the above voltage to the negative low-voltage high-frequency transformer; and then the negative low-voltage high-frequency transformer outputs the adjusted voltage to the ignition discharge circuit according to the received voltage, so that the ignition discharge circuit responds to the PWM signal output by the microcontroller unit.

[0120] The present application also provides a wire bonding machine, the wire bonding machine comprising a wire bonding detection circuit configured to implement the wire bonding detection method as described above, and an ignition discharge circuit. Since the wire bonding machine provided by the present application can implement the wire bonding detection method provided by the present application, the wire bonding machine provided by the present application also has all the technical effects of the wire bonding detection method.

[0121] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A welding wire detection method, characterized in that: Applied to a wire bonding machine, the wire bonding machine includes an ignition discharge circuit, and the method includes: During the operation of the wire bonding machine, sampling the voltage and current output by the ignition discharge circuit; Determine the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value; The working state of the wire bonding machine is determined according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value.

2. The method according to claim 1, characterized in that The determining the working state of the wire bonding machine according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value comprises: Determining a voltage output state of the wire bonding machine according to the voltage sampling maximum value and the voltage sampling minimum value; Determining a current output state of the wire bonding machine according to the current sampling maximum value and the current sampling minimum value; When the voltage output state of the wire bonding machine is abnormal and / or the current output state of the wire bonding machine is abnormal, it is determined that the wire bonding machine is operating abnormally.

3. The method according to claim 2, characterized in that Determining the voltage output state of the wire bonding machine according to the voltage sampling maximum value and the voltage sampling minimum value includes: Calculating a voltage sampling difference between the voltage sampling maximum value and the voltage sampling minimum value; When the voltage sampling difference is greater than or equal to the voltage threshold, determining that the voltage output state of the wire bonding machine is abnormal; When the voltage sampling difference is less than the voltage threshold, it is determined that the voltage output state of the wire bonding machine is normal.

4. The method according to claim 3, characterized in that The method further comprises: During the operation of the wire bonding machine, and when the working state of the wire bonding machine is normal, detecting the maximum voltage value and the minimum voltage value output by the ignition discharge circuit; Calculating a voltage detection difference between the maximum voltage value and the minimum voltage value; The voltage threshold is determined according to the voltage detection difference.

5. The method according to claim 2, characterized in that: The step of determining the current output state of the wire bonding machine according to the current sampling maximum value and the current sampling minimum value comprises: Calculating a current sampling difference between the current sampling maximum value and the current sampling minimum value; When the current sampling difference is greater than or equal to the current threshold, determining that the current output state of the wire bonding machine is abnormal; When the current sampling difference is less than the current threshold, it is determined that the current output state of the wire bonding machine is normal.

6. The method according to claim 5, characterized in that The method further comprises: During the operation of the wire bonding machine, and when the working state of the wire bonding machine is normal, detecting the maximum current value and the minimum current value output by the ignition discharge circuit; calculating a current detection difference between the maximum current value and the minimum current value; The current threshold is determined according to the current detection difference.

7. A wire bonding detection circuit, characterized in that: The bonding wire detection circuit includes a micro control unit, a current sampling circuit and a voltage sampling circuit; The input end of the current sampling circuit is electrically connected to the current sampling end of the ignition discharge circuit, the output end of the current sampling circuit is electrically connected to the first input end of the micro control unit, the input end of the voltage sampling circuit is electrically connected to the voltage sampling end of the ignition discharge circuit, the output end of the voltage sampling circuit is electrically connected to the second input end of the micro control unit, and the output end of the micro control unit is electrically connected to the signal input end of the ignition discharge circuit; Wherein, the current sampling circuit is used to sample the current output by the ignition discharge circuit during the operation of the wire welding machine; The voltage sampling circuit is used to sample the voltage output by the ignition discharge circuit during the operation of the wire bonding machine; The micro control unit is used to determine the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value; The working state of the wire bonding machine is determined according to the voltage sampling maximum value, the voltage sampling minimum value, the current sampling maximum value and the current sampling minimum value.

8. The wire bonding detection circuit according to claim 7, characterized in that: The voltage sampling circuit includes a DC voltage divider, an inverting amplifier and an AD converter, and the current sampling circuit includes a current sampling subcircuit and an AD converter.

9. The wire bonding detection circuit according to claim 7, characterized in that: The welding wire detection circuit also includes a negative high voltage control circuit, a negative high voltage high frequency transformer, a negative low voltage drive circuit, a negative low voltage high frequency transformer, a DA converter and a constant current control circuit; The input end of the negative high voltage control circuit is electrically connected to the pulse signal output end of the micro control unit, the output end of the negative high voltage control circuit is electrically connected to the input end of the negative high voltage high frequency transformer, and the output end of the negative high voltage high frequency transformer is electrically connected to the first signal input end of the ignition discharge circuit; The input end of the negative low-voltage drive circuit is electrically connected to the PWM signal output end of the micro control unit, the output end of the negative low-voltage drive circuit is electrically connected to the first input end of the negative low-voltage high-frequency transformer, the input end of the DA converter is electrically connected to the signal output end of the micro control unit, the output end of the DA converter is electrically connected to the input end of the constant current control circuit, the output end of the constant current control circuit is electrically connected to the second input end of the negative low-voltage high-frequency transformer, and the output end of the negative low-voltage high-frequency transformer is electrically connected to the second signal input end of the ignition discharge circuit.

10. A wire bonding machine, characterized in that: The wire bonding machine comprises a wire bonding detection circuit configured to implement the wire bonding detection method according to any one of claims 1 to 6, and an ignition discharge circuit.

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