A dispensing control system for an automatic die bonder

Abstract

The present invention relates to dispensing control, and particularly to a dispensing control system for an automatic die bonder, a human-machine interaction module, which performs image recognition on the images captured by a camera on the dispenser, determines the dispensing position by analyzing the features of the target object, and monitors the operating state of the dispensing control system, and adjusts the dispensing parameters by recording and analyzing the dispensing operation data; a dispensing control module, which determines whether the solenoid valve opening condition is satisfied according to the state of the dispenser, and when the solenoid valve opening condition is satisfied, generates a control signal to control the solenoid valve of the dispenser at a specific time point based on the comprehensive analysis of the dispensing program, the dispensing position and the dispensing parameters, and performs regulation when the solenoid valve opening condition is not satisfied; the technical solution provided by the present invention can effectively overcome the defects of low dispensing accuracy, inability to effectively adjust the temperature and pressure during dispensing, inability to accurately control the dispensing amount, and inability to accurately and efficiently adjust the dispensing parameters.

Description

Technical Field

[0001] The present invention relates to dispensing control, and particularly to a dispensing control system for an automatic die bonder. Background Art

[0002] Die bonding generally involves sucking the chips on the wafer from the chip supply position by a die bonding swing arm, then moving to the die bonding position on the substrate, precisely placing the chips on the substrate, and using a dispenser for dispensing to achieve die bonding.

[0003] The positioning and alignment of traditional dispensers usually rely on manual adjustment by operators, with relatively low positioning and alignment accuracy, which may lead to deviations in the die bonding position, affecting product quality and stability. Moreover, operators need to manually set and adjust dispensing parameters, with a high degree of manual dependence, increasing the risk of human errors and having high requirements for the experience and skills of operators. Due to the lack of data recording and analysis functions in traditional dispensers, it is difficult to perform flexible process adjustment and optimization. During the production process, the adjustment of dispensing parameters often requires repeated tests, resulting in low efficiency.

[0004] Traditional dispensers usually do not have the function of automatic adjustment of temperature and pressure, making it difficult to precisely control the temperature and pressure during die bonding, bringing difficulties to the practical application of dispensing processes that require special temperature and pressure conditions. In addition, the clock accuracy of traditional dispensers is also relatively low, and the timing control is not stable and accurate enough, which may have a greater impact on some applications with high timing requirements, such as integrated circuit packaging. Summary of the Invention

[0005] Aiming at the above-mentioned disadvantages of the prior art, the present invention provides a dispensing control system for an automatic die bonder, which can effectively overcome the defects of the prior art, such as low dispensing accuracy, inability to effectively adjust the temperature and pressure during dispensing, inability to accurately control the dispensing amount, and inability to accurately and efficiently adjust dispensing parameters.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] A dispensing control system for an automatic die bonder includes a human-machine interaction module and a dispensing control module;

[0008] The human-machine interaction module creates different dispensing modes and methods as needed, edits and generates corresponding dispensing programs and sends them to the dispensing control module, performs image recognition on the images captured by the camera on the dispenser, determines the dispensing position by analyzing the characteristics of the target object, has the function of allowing operators to set dispensing parameters, and simultaneously monitors the operating status of the dispensing control system, and adjusts the dispensing parameters by recording and analyzing the dispensing operation data;

[0009] The dispensing control module determines whether the solenoid valve opening condition is met based on the state of the dispensing machine. When the solenoid valve opening condition is met, a control signal is generated at a specific time point based on a comprehensive analysis of the dispensing program, dispensing position, and dispensing parameters to control the solenoid valve of the dispensing machine, and regulation is performed when the solenoid valve opening condition is not met.

[0010] Preferably, the dispensing control module includes a dispensing control circuit, a serial communication interface circuit, a solenoid valve drive circuit, an alarm circuit, a dispensing storage circuit, a dispensing power supply circuit, and a clock circuit;

[0011] The serial communication interface circuit receives the dispensing program, dispensing position sent by the human-machine interaction module, and generates updated dispensing parameters for the dispensing operation data, and sends the dispensing operation data generated during the dispensing operation to the human-machine interaction module, and at the same time receives the detection data of the temperature sensor and the pressure sensor;

[0012] The dispensing control circuit determines whether the solenoid valve opening condition is met based on the detection data of the temperature sensor and the pressure sensor, and when the solenoid valve opening condition is met, a control signal is generated at a specific time point based on a comprehensive analysis of the dispensing program, dispensing position, and dispensing parameters to control the solenoid valve drive circuit;

[0013] The solenoid valve drive circuit completes the opening and closing actions of the solenoid valve of the dispensing machine under the control of the dispensing control circuit;

[0014] The alarm circuit is used to give an alarm under the control of the dispensing control circuit when the solenoid valve opening condition is not met.

[0015] Preferably, the dispensing control circuit includes a control chip U1, and the control chip U1 is connected to the serial communication interface circuit, the solenoid valve drive circuit, the alarm circuit, the dispensing storage circuit, the dispensing power supply circuit, and the clock circuit, and is responsible for the control and coordination work of the entire dispensing control module.

[0016] Preferably, the serial communication interface circuit includes a MAX232 chip U2 and a serial communication interface J3. A first current-limiting resistor R1 and a second current-limiting resistor R2 for limiting the signal current are connected between the MAX232 chip U2 and the serial communication interface J3 to ensure the stability and reliability of the circuit;

[0017] A third capacitor C3 and a fourth capacitor C4 for stabilizing and filtering are respectively connected between the 1st and 3rd pins and between the 4th and 5th pins of the MAX232 chip U2 to ensure the stability and reliability of the power supply voltage.

[0018] Preferably, the control chip U1 is connected to the temperature sensor and the pressure sensor through a signal filtering circuit and a signal amplifying circuit in sequence, amplifies and filters the analog voltage signals output by the temperature sensor and the pressure sensor to obtain stable analog voltage signals;

[0019] The control chip U1 uses the built-in analog-to-digital converter to convert the analog voltage signals into digital voltage signals, and comprehensively analyzes the digital voltage signals of the temperature sensor and the pressure sensor;

[0020] When the detection data of both the temperature sensor and the pressure sensor are within the preset threshold range, the control chip U1 determines that the solenoid valve opening condition is met, and generates a control signal to control the solenoid valve drive circuit;

[0021] When the detection data of the temperature sensor and / or the pressure sensor are not within the preset threshold range, the control chip U1 determines that the solenoid valve opening condition is not met, and generates a control signal to control the alarm circuit;

[0022] Among them, when the detection data of the temperature sensor are not within the preset threshold range, the control chip U1 activates the corresponding temperature adjustment device to regulate the temperature within the set threshold range;

[0023] When the detection data of the pressure sensor are not within the preset threshold range, the control chip U1 controls the pressure of the dispensing output by regulating the current signal of the solenoid valve to achieve precise control of the flow and stop of the dispensing.

[0024] Preferably, the solenoid valve drive circuit includes a relay control circuit, an optocoupler control circuit, and a drive circuit connected in sequence;

[0025] The relay control circuit includes a relay K2, a rectifier diode D3, and a second triode Q2. The base of the second triode Q2 is connected to the control chip U1 through a seventh resistor R7. A rectifier diode D3 is reversely connected in parallel between the 3rd and 4th pins of the relay K2. The collector of the second triode Q2 is connected to the 3rd pin of the relay K2. The output end of the relay K2 is connected to the optocoupler control circuit;

[0026] The optocoupler control circuit includes an optocoupler U5, a first current-limiting resistor R1, and a second current-limiting resistor R2. The input end of the optocoupler U5 is connected to the output end of the relay K2. One output end of the optocoupler U5 is connected to the power supply through the second current-limiting resistor R2. The other output end of the optocoupler U5 is connected to the drive circuit through the first current-limiting resistor R1;

[0027] The driving circuit includes a third triode Q3, a solenoid valve interface J4, and an indicator light LED2. The base of the third triode Q3 is connected to a first current-limiting resistor R1. The collector of the third triode Q3 is connected to the solenoid valve interface J4 through a potentiometer R5. The collector of the third triode Q3 is connected to the solenoid valve interface J4 and the power supply through the indicator light LED2. A rectifier diode D1 is connected in parallel with the indicator light LED2.

[0028] Preferably, the alarm circuit includes a first triode Q1 and a buzzer beep1. The base of the first triode Q1 is connected to the control chip U1 through a fourth resistor R4. The collector of the first triode Q1 is connected to the power supply. The emitter of the first triode Q1 is grounded through the buzzer beep1.

[0029] Preferably, the dispensing storage circuit includes a storage chip U4. The serial data input / output pin SDA of the storage chip U4 is connected to the control chip U1, serving as a bidirectional channel for sending and receiving data.

[0030] The serial clock input pin SCL of the storage chip U4 is connected to the control chip U1. The control chip U1 determines the speed and timing of data transmission by controlling this pin.

[0031] A nineteenth capacitor C19 for preventing clutter signals from entering the storage chip U4 is connected between the VCC and GND pins of the storage chip U4 to improve the working reliability of the storage chip U4.

[0032] Preferably, the dispensing power supply circuit includes a power supply chip U3. An eighth capacitor C8 and a ninth capacitor C9 are connected in parallel between the input terminal of the power supply chip U3 and the ground. A tenth capacitor C10 and an eleventh capacitor C11 are connected in parallel between the output terminal of the power supply chip U3 and the ground.

[0033] Preferably, the clock circuit includes an external crystal oscillator circuit and an internal RC oscillator circuit for providing a clock signal. The external crystal oscillator circuit is respectively connected to the OSC IN and OSC OUT pins of the control chip U1. The crystal oscillator frequency of the external crystal oscillator circuit is 8 MHz.

[0034] The internal RC oscillator circuit is respectively connected to the OSC32 IN and OSC32 OUT pins of the control chip U1. The crystal oscillator frequency of the internal RC oscillator circuit is 32.768 KHz.

[0035] Compared with the prior art, the dispensing control system for an automatic die bonder provided by the present invention has the following beneficial effects:

[0036] 1) The human-machine interaction module performs image recognition on the images captured by the camera on the dispenser, determines the dispensing position by analyzing the features of the target object, can achieve high-precision positioning and alignment, making the die bonding position more accurate, and improving the product quality and stability;

[0037] 2) It has the function of automatic temperature and pressure adjustment. Different materials have different sensitivities to temperature and pressure. Some materials are very sensitive to changes in temperature and pressure. The temperature and pressure during dispensing can be adjusted according to needs to meet the requirements of different application scenarios;

[0038] 3) It is more accurate in terms of clock accuracy, can provide more stable and accurate timing control. At the same time, by combining the timing function of the clock circuit with the solenoid valve drive circuit, precise control of the dispensing volume is achieved, improving the consistency and stability of the product;

[0039] 4) The dispensing control module sends the dispensing operation data generated during the dispensing operation to the human-machine interaction module. The human-machine interaction module monitors the running state of the dispensing control system, adjusts the dispensing parameters by recording and analyzing the dispensing operation data, so that the dispensing parameters can be accurately and efficiently adjusted. At the same time, by recording the dispensing operation data related to each die bonding, the production process becomes more controllable, facilitating process improvement and quality analysis. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 is the system schematic diagram of the present invention;

[0042] Figure 2 is the flow schematic diagram of the present invention;

[0043] Figure 3 is the circuit diagram of the dispensing control circuit in the present invention;

[0044] Figure 4 is the circuit diagram of the serial communication interface circuit in the present invention;

[0045] Figure 5 is the circuit diagram of the solenoid valve drive circuit in the present invention;

[0046] Figure 6 is the circuit diagram of the alarm circuit in the present invention;

[0047] Figure 7 This is the circuit diagram of the dispensing storage circuit of the present invention;

[0048] Figure 8 This is the circuit diagram of the dispensing power supply circuit of the present invention;

[0049] Figure 9 This is the circuit diagram of the clock circuit of the present invention. Detailed implementation manners

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] A dispensing control system for an automatic die bonder, as Figure 1 shown, includes a human-machine interaction module and a dispensing control module;

[0052] The human-machine interaction module creates different dispensing modes and methods as needed, edits and generates corresponding dispensing programs and sends them to the dispensing control module, performs image recognition on the images captured by the camera on the dispenser, determines the dispensing position by analyzing the features of the target object, has the function of allowing operators to set dispensing parameters (such as dispensing volume, dispensing speed, dispensing trajectory, dispensing time, etc.), and monitors the operating status of the dispensing control system at the same time, and adjusts the dispensing parameters by recording and analyzing the dispensing operation data;

[0053] The dispensing control module determines whether the solenoid valve opening condition is met according to the state of the dispenser. When the solenoid valve opening condition is met, based on the comprehensive analysis of the dispensing program, dispensing position and dispensing parameters, a control signal is generated at a specific time point to control the solenoid valve of the dispenser, and regulation is performed when the solenoid valve opening condition is not met.

[0054] The dispensing control module includes a dispensing control circuit, a serial communication interface circuit, a solenoid valve drive circuit, an alarm circuit, a dispensing storage circuit, a dispensing power supply circuit and a clock circuit;

[0055] The serial communication interface circuit receives the dispensing program, dispensing position sent by the human-machine interaction module, and the updated dispensing parameters generated for the dispensing operation data, sends the dispensing operation data generated during the dispensing operation to the human-machine interaction module, and simultaneously receives the detection data of the temperature sensor and the pressure sensor;

[0056] The dispensing control circuit determines whether the solenoid valve opening condition is met based on the detection data of the temperature sensor and the pressure sensor, and when the solenoid valve opening condition is met, generates a control signal at a specific time point to control the solenoid valve drive circuit based on the comprehensive analysis of the dispensing program, dispensing position, and dispensing parameters;

[0057] The solenoid valve drive circuit completes the opening and closing actions of the dispensing machine solenoid valve under the control of the dispensing control circuit;

[0058] The alarm circuit is used to give an alarm under the control of the dispensing control circuit when the solenoid valve opening condition is not met.

[0059] 1) As Figure 3 shown, the dispensing control circuit includes a control chip U1, and the control chip U1 is connected to a serial communication interface circuit, a solenoid valve drive circuit, an alarm circuit, a dispensing storage circuit, a dispensing power supply circuit, and a clock circuit, and is responsible for the control and coordination of the entire dispensing control module.

[0060] 2) As Figure 4 shown, the serial communication interface circuit includes a MAX232 chip U2 and a serial communication interface J3. A first current limiting resistor R1 and a second current limiting resistor R2 for limiting the signal current are connected between the MAX232 chip U2 and the serial communication interface J3 to ensure the stability and reliability of the circuit;

[0061] A third capacitor C3 and a fourth capacitor C4 for stabilizing and filtering are respectively connected between pins 1 and 3, and between pins 4 and 5 of the MAX232 chip U2 to ensure the stability and reliability of the power supply voltage.

[0062] In the technical solution of this application, the control chip U1 is connected to the temperature sensor and the pressure sensor through a signal filtering circuit and a signal amplification circuit in sequence, and amplifies and filters the analog voltage signals output by the temperature sensor and the pressure sensor to obtain stable analog voltage signals;

[0063] The control chip U1 uses the built-in analog-to-digital converter to convert the analog voltage signal into a digital voltage signal, and comprehensively analyzes the digital voltage signals of the temperature sensor and the pressure sensor;

[0064] When the detection data of both the temperature sensor and the pressure sensor are within the preset threshold range, the control chip U1 determines that the solenoid valve opening condition is met, and generates a control signal to control the solenoid valve drive circuit;

[0065] When the detection data of the temperature sensor and / or the pressure sensor is not within the preset threshold range, the control chip U1 determines that the solenoid valve opening condition is not met, and generates a control signal to control the alarm circuit;

[0066] Among them, when the detection data of the temperature sensor is not within the preset threshold range, the control chip U1 activates the corresponding temperature adjustment device to regulate the temperature within the set threshold range, ensuring that the glue exhibits the best viscosity, fluidity, and reaction speed, thereby guaranteeing the dispensing quality;

[0067] When the detection data of the pressure sensor is not within the preset threshold range, the control chip U1 controls the pressure of the dispensing output by regulating the current signal of the solenoid valve, achieving precise control of the flow and stop of the dispensing.

[0068] The temperature sensor utilizes the characteristics of thermosensitive materials. A thermistor is an element with a temperature-dependent resistance value, and its resistance value changes significantly with temperature. The thermistor exhibits a negative temperature coefficient characteristic. When the temperature rises, the resistance value of the NTC thermistor decreases. By measuring the change in the resistance value, the change in temperature can be determined, and the temperature sensor then converts it into an analog voltage signal through an internal converter.

[0069] The pressure sensor adopts a strain measurement type pressure sensor. This type of sensor utilizes the characteristics of strain gauges. A strain gauge is a sensitive material that deforms when pressure is applied to it, thereby changing its resistance value. The strain gauge is usually combined with a cantilever beam or diaphragm. When the measured pressure acts on the cantilever beam or diaphragm, it causes the strain gauge to deform, resulting in strain in the strain gauge, and the resistance value of the strain gauge changes accordingly. By measuring the change in the resistance value, the change in pressure can be indirectly measured, and the pressure sensor then converts it into an analog voltage signal through an internal converter.

[0070] 3) As Figure 5 shown, the solenoid valve drive circuit includes a relay control circuit, an optocoupler control circuit, and a drive circuit connected in sequence;

[0071] The relay control circuit includes a relay K2 (HK4100F), a rectifier diode D3 (1N4007), and a second triode Q2. The base of the second triode Q2 is connected to the control chip U1 through the seventh resistor R7. A rectifier diode D3 is reversely connected in parallel between the 3rd and 4th pins of the relay K2. The collector of the second triode Q2 is connected to the 3rd pin of the relay K2, and the output end of the relay K2 is connected to the optocoupler control circuit;

[0072] The optocoupler control circuit includes an optocoupler U5, a first current-limiting resistor R1, and a second current-limiting resistor R2. The input end of the optocoupler U5 is connected to the output end of the relay K2. One output end of the optocoupler U5 is connected to the power supply through the second current-limiting resistor R2, and the other output end of the optocoupler U5 is connected to the drive circuit through the first current-limiting resistor R1;

[0073] The drive circuit includes a third triode Q3, a solenoid valve interface J4, and an indicator light LED2. The base of the third triode Q3 is connected to a first current-limiting resistor R1. The collector of the third triode Q3 is connected to the solenoid valve interface J4 through a potentiometer R5. The collector of the third triode Q3 is connected to the solenoid valve interface J4 and the power supply through the indicator light LED2. A rectifier diode D1 (1N4007) is connected in parallel with the indicator light LED2.

[0074] In the relay control circuit, the rectifier diode D3 can conduct reverse current immediately after the electromagnetic field of the relay K2 is cut off, reducing the peak values of voltage and current to protect the second triode Q2. When the PB12 pin of the control chip U1 outputs a high level, the second triode Q2 conducts, outputting a large enough current to attract the electromagnet of the relay K2, and the relay K2 closes.

[0075] In the optocoupler control circuit, as the input current of the optocoupler U5 increases, the brightness of the internal light-emitting diode also increases, and the output current of the optocoupler U5 will increase accordingly. An optocoupler generally consists of three parts: light emission, light reception, and signal amplification. The input electrical signal drives the light-emitting diode to emit light of a certain wavelength, which is received by the photodetector to generate a photocurrent, and then further amplified and output to complete the "electric-optical-electric" conversion, thus playing the role of input and output isolation. In this circuit, only a small current is sufficient to drive the third triode Q3, so the first current-limiting resistor R1 and the second current-limiting resistor R2 are added.

[0076] In the drive circuit, when the third triode Q3 conducts, the indicator light LED2 lights up, and at the same time, the dispensing machine solenoid valve opens. The function of the potentiometer R5 is to debug the circuit. Since the specific driving voltage of the solenoid valve has a certain floating value and the accuracies of solenoid valves of different specifications are different, after debugging, a fixed-value resistor can be used instead, so that the opening of the solenoid valve and the lighting of the indicator light can be synchronized. The function of the rectifier diode D1 is to form a return circuit with the solenoid valve to weaken the impact of the reverse current.

[0077] After the solenoid valve opens, high-pressure gas enters the syringe, pushing the piston to make the colloid flow out of the needle tip. In this process, the amount of glue dispensed on the substrate can be controlled according to the set gas pressure and operation time.

[0078] 4) As Figure 6 shown, the alarm circuit includes a first triode Q1 and a buzzer beep1. The base of the first triode Q1 is connected to the control chip U1 through a fourth resistor R4. The collector of the first triode Q1 is connected to the power supply. The emitter of the first triode Q1 is grounded through the buzzer beep1.

[0079] When the control chip U1 determines that the solenoid valve opening condition is not met, the PB10 pin of the control chip U1 outputs a high level, the first triode Q1 conducts, and the buzzer beep1 alarms.

[0080] 5) As Figure 7 shown, the dispensing storage circuit includes a storage chip U4. The serial data input / output pin SDA of the storage chip U4 is connected to the control chip U1, serving as a two-way channel for sending and receiving data;

[0081] The serial clock input pin SCL of the storage chip U4 is connected to the control chip U1. The control chip U1 determines the speed and timing of data transmission by controlling this pin;

[0082] A nineteenth capacitor C19 for blocking clutter signals from entering the storage chip U4 is connected between the VCC and GND pins of the storage chip U4 to improve the working reliability of the storage chip U4, ensure that the storage chip U4 can work properly and accurately access and store data.

[0083] 6) As Figure 8 shown, the dispensing power supply circuit includes a power supply chip U3. An eighth capacitor C8 and a ninth capacitor C9 are connected in parallel between the input terminal of the power supply chip U3 and the ground, and a tenth capacitor C10 and an eleventh capacitor C11 are connected in parallel between the output terminal of the power supply chip U3 and the ground.

[0084] The four capacitors are connected in parallel, which can effectively filter out high-frequency clutter and electromagnetic interference in the power supply, improve the quality of the output voltage, and also play a voltage stabilizing role, providing a stable and reliable power supply to ensure the normal operation of each component. At the same time, it can also control and protect the output voltage to avoid component damage or improper operation caused by abnormal voltage.

[0085] 7) As Figure 9 shown, the clock circuit includes an external crystal oscillator circuit and an internal RC oscillator circuit for providing clock signals. The external crystal oscillator circuit is respectively connected to the OSC IN and OSC OUT pins of the control chip U1, and the crystal oscillator frequency of the external crystal oscillator circuit is 8 MHz;

[0086] The internal RC oscillator circuit is respectively connected to the OSC32 IN and OSC32 OUT pins of the control chip U1, and the crystal oscillator frequency of the internal RC oscillator circuit is 32.768 KHz.

[0087] In practical applications, the external crystal oscillator circuit or the internal RC oscillator circuit can be selected according to needs to provide the clock signal. For scenarios with high timing requirements, the external crystal oscillator can be selected to switch to, while for scenarios with high energy-saving requirements, the internal RC oscillator can be selected to switch to. By switching different clock sources, different power consumption requirements and application scenarios can be met on the basis of ensuring accuracy.

[0088] As Figure 2 shown, the specific dispensing control method of the technical solution of this application includes:

[0089] S1. The computer connected to the die bonder uses dispensing software to compile the program, creates different dispensing modes and methods as needed, edits and generates the corresponding dispensing program, and sends it to the dispensing control module through the serial communication interface circuit;

[0090] S2. The operator uses the image recognition function of the human-machine interaction module to analyze the characteristics of the target object to determine the dispensing position, realizes automatic positioning, and ensures the dispensing accuracy;

[0091] S3. The operator sets the dispensing parameters through the human-machine interaction module, and the human-machine interaction module sends the dispensing position and dispensing parameters to the dispensing control module through the serial communication interface circuit;

[0092] S4. The dispensing control circuit judges whether the solenoid valve opening condition is satisfied according to the detection data of the temperature sensor and the pressure sensor. When the solenoid valve opening condition is satisfied, based on the comprehensive analysis of the dispensing program, dispensing position and dispensing parameters, a control signal is generated at a specific time point to control the solenoid valve of the dispenser, and regulation is carried out when the solenoid valve opening condition is not satisfied;

[0093] S5. When the solenoid valve is opened, the clock circuit starts timing. When the count reaches the preset value, the dispensing control circuit sends a clearing signal to the clock circuit to stop counting, closes the solenoid valve, and performs the dispensing operation at the next dispensing position;

[0094] S6. After all dispensing operations are completed, the collected data is processed and analyzed by the software in the dispensing control system, generates the corresponding dispensing operation data, and is fed back to the computer connected to the die bonder through the serial communication interface circuit. The computer connected to the die bonder records and analyzes the dispensing operation data to adjust the dispensing parameters;

[0095] Among them, the dispensing operation data includes the difference between the actual dispensing parameters and the preset dispensing parameters during the dispensing operation process, as well as the specific dispensing parameter values that need to be adjusted, etc.

[0096] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dispensing control system for an automatic die bonder, characterized in that: it includes a human-machine interaction module and a dispensing control module; The human-machine interaction module creates different dispensing modes and methods as needed, edits and generates corresponding dispensing programs and sends them to the dispensing control module, performs image recognition on the images captured by the camera on the dispenser, determines the dispensing position by analyzing the features of the target object, has the function of allowing operators to set dispensing parameters, and at the same time monitors the operating status of the dispensing control system, and adjusts the dispensing parameters by recording and analyzing the dispensing operation data; The dispensing control module judges whether the solenoid valve opening condition is met according to the state of the die bonder. When the solenoid valve opening condition is met, based on the comprehensive analysis of the dispensing program, dispensing position and dispensing parameters, it generates a control signal at a specific time point to control the solenoid valve of the die bonder, and makes adjustments when the solenoid valve opening condition is not met; The dispensing control module includes a dispensing control circuit, a serial communication interface circuit, a solenoid valve drive circuit, an alarm circuit, a dispensing storage circuit, a dispensing power supply circuit and a clock circuit; The serial communication interface circuit receives the dispensing program, dispensing position sent by the human-machine interaction module, and updated dispensing parameters generated for the dispensing operation data, sends the dispensing operation data generated during the dispensing operation to the human-machine interaction module, and at the same time receives the detection data of the temperature sensor and the pressure sensor; The dispensing control circuit judges whether the solenoid valve opening condition is met according to the detection data of the temperature sensor and the pressure sensor. When the solenoid valve opening condition is met, based on the comprehensive analysis of the dispensing program, dispensing position and dispensing parameters, it generates a control signal at a specific time point to control the solenoid valve drive circuit; The solenoid valve drive circuit completes the opening and closing actions of the solenoid valve of the die bonder under the control of the dispensing control circuit; The alarm circuit is used to give an alarm under the control of the dispensing control circuit when the solenoid valve opening condition is not met; The dispensing control circuit includes a control chip (U1), and the control chip (U1) is connected to the serial communication interface circuit, the solenoid valve drive circuit, the alarm circuit, the dispensing storage circuit, the dispensing power supply circuit and the clock circuit, and is responsible for the control and coordination of the entire dispensing control module; The control chip (U1) is connected to the temperature sensor and the pressure sensor through a signal filtering circuit and a signal amplification circuit in sequence, and amplifies and filters the analog voltage signals output by the temperature sensor and the pressure sensor to obtain stable analog voltage signals; The control chip (U1) uses the built-in analog-to-digital converter to convert the analog voltage signal into a digital voltage signal, and comprehensively analyzes the digital voltage signals of the temperature sensor and the pressure sensor; When the detection data of both the temperature sensor and the pressure sensor are within the preset threshold range, the control chip (U1) judges that the solenoid valve opening condition is met, and generates a control signal to control the solenoid valve drive circuit; When the detection data of the temperature sensor and / or the pressure sensor is not within the preset threshold range, the control chip (U1) judges that the solenoid valve opening condition is not met, and generates a control signal to control the alarm circuit; Among them, when the detection data of the temperature sensor is not within the preset threshold range, the control chip (U1) activates the corresponding temperature adjustment device to regulate the temperature within the preset threshold range; When the detection data of the pressure sensor is not within the preset threshold range, the control chip (U1) controls the pressure of the dispensing output by regulating the current signal of the solenoid valve to achieve precise control of the flow and stop of the dispensing.

2. The dispensing control system for an automatic die bonder according to claim 1, characterized in that: The serial communication interface circuit includes a MAX232 chip (U2) and a serial communication interface (J3). A first current-limiting resistor (R1) and a second current-limiting resistor (R2) for limiting the signal current are connected between the MAX232 chip (U2) and the serial communication interface (J3) to ensure the stability and reliability of the circuit; Between the 1st and 3rd pins, and between the 4th and 5th pins of the MAX232 chip (U2), a third capacitor (C3) and a fourth capacitor (C4) for stabilizing and filtering are respectively connected to ensure the stability and reliability of the power supply voltage.

3. The dispensing control system for an automatic die bonder according to claim 1, characterized in that: The solenoid valve drive circuit includes a relay control circuit, an optocoupler control circuit and a drive circuit connected in sequence; The relay control circuit includes a relay (K2), a rectifier diode (D3) and a second triode (Q2). The base of the second triode (Q2) is connected to the control chip (U1) through a seventh resistor (R7). A rectifier diode (D3) is reversely connected in parallel between the 3rd and 4th pins of the relay (K2). The collector of the second triode (Q2) is connected to the 3rd pin of the relay (K2). The output end of the relay (K2) is connected to the optocoupler control circuit; The optocoupler control circuit includes an optocoupler (U5), a first current-limiting resistor (R1) and a second current-limiting resistor (R2). The input end of the optocoupler (U5) is connected to the output end of the relay (K2). One output end of the optocoupler (U5) is connected to the power supply through the second current-limiting resistor (R2). The other output end of the optocoupler (U5) is connected to the drive circuit through the first current-limiting resistor (R1); The drive circuit includes a third triode (Q3), a solenoid valve interface (J4) and an indicator light (LED2). The base of the third triode (Q3) is connected to the first current-limiting resistor (R1). The collector of the third triode (Q3) is connected to the solenoid valve interface (J4) through a potentiometer (R5). The collector of the third triode (Q3) is connected to the solenoid valve interface (J4) and the power supply through the indicator light (LED2). A rectifier diode (D1) is connected in parallel on the indicator light (LED2).

4. The dispensing control system for an automatic die bonder according to claim 1, characterized in that: The alarm circuit includes a first triode (Q1) and a buzzer (beep1). The base of the first triode (Q1) is connected to the control chip (U1) through a fourth resistor (R4). The collector of the first triode (Q1) is connected to the power supply, and the emitter of the first triode (Q1) is grounded through the buzzer (beep1).

5. The dispensing control system for an automatic die bonder according to claim 1, wherein: the dispensing storage circuit includes a storage chip (U4). The serial data input / output pin SDA of the storage chip (U4) is connected to the control chip (U1) and serves as a two-way channel for sending and receiving data; the serial clock input pin SCL of the storage chip (U4) is connected to the control chip (U1). The control chip (U1) determines the speed and timing of data transmission by controlling this pin; a nineteenth capacitor (C19) for preventing clutter signals from entering the storage chip (U4) is connected between the VCC and GND pins of the storage chip (U4) to improve the working reliability of the storage chip (U4).

6. The dispensing control system for an automatic die bonder according to claim 1, wherein: the dispensing power supply circuit includes a power supply chip (U3). An eighth capacitor (C8) and a ninth capacitor (C9) are connected in parallel between the input end of the power supply chip (U3) and the ground, and a tenth capacitor (C10) and an eleventh capacitor (C11) are connected in parallel between the output end of the power supply chip (U3) and the ground.

7. The dispensing control system for an automatic die bonder according to claim 1, wherein: the clock circuit includes an external crystal oscillator circuit and an internal RC oscillator circuit for providing a clock signal. The external crystal oscillator circuit is respectively connected to the OSC IN and OSC OUT pins of the control chip (U1), and the crystal oscillator frequency of the external crystal oscillator circuit is 8 MHz; the internal RC oscillator circuit is respectively connected to the OSC32 IN and OSC32 OUT pins of the control chip (U1), and the crystal oscillator frequency of the internal RC oscillator circuit is 32.768 KHz.

Images