Double-light-source laser control circuit

Abstract

The utility model discloses a control circuit of a double-light-source laser. The circuit comprises a power supply step-down control circuit used for realizing power supply; the first control circuit is used for processing data and controlling each circuit element; the second control circuit is electrically connected with the first control circuit and is used for switching and outputting the red light source or the blue light source; one side of the first control circuit is electrically connected with a third control circuit used for transmitting temperature data. The fourth control circuit is used for controlling the fan to dissipate heat; a fifth control circuit for realizing power control is also arranged between the first control circuit and the second control circuit, so that switching output of the red light source and the blue light source can be realized through an integrated circuit design; pID air cooling intelligent temperature control is carried out; and multi-parameter synchronous acquisition and protection are realized.

Description

Technical Field

[0001] This utility model belongs to the field of laser control technology, specifically relating to a dual-source laser control circuit. Background Technology

[0002] Currently, dual-source lasers (red and blue light) are widely used in medical aesthetics, materials processing and other fields, but existing control circuits have the following defects: low red and blue light switching efficiency and lack of intelligent control; high-power lasers heat up quickly and traditional heat dissipation solutions are not accurate enough; data acquisition modules and drive circuits are not integrated, resulting in poor system stability.

[0003] Therefore, in response to the technical problems and defects mentioned above, such as low red-blue light switching efficiency, lack of intelligent control, rapid temperature rise of high-power lasers and insufficient precision of traditional heat dissipation solutions, and poor system stability due to the lack of integration between the data acquisition module and the drive circuit, there is an urgent need to design and develop a dual-source laser control circuit. Utility Model Content

[0004] The purpose of this utility model is to provide a dual-source laser control circuit;

[0005] The purpose of this utility model is achieved as follows: the circuit includes a power supply step-down control circuit for power supply; the circuit also includes a first control circuit for processing data and controlling each circuit element; and a second control circuit electrically connected to the first control circuit and used for switching the output of red light source or blue light source.

[0006] One side of the first control circuit is also electrically connected to a third control circuit for transmitting temperature data; and a fourth control circuit for controlling fan cooling.

[0007] A fifth control circuit for power control is provided between the first control circuit and the second control circuit.

[0008] Furthermore, the first control circuit is provided with a fifteenth control chip, one side of which is electrically connected to the eighteenth and seventeenth pins and the first and second pins of the serial communication module.

[0009] Furthermore, the fifteenth control chip is model STM32F030F4.

[0010] Furthermore, the second control circuit is also provided with a sixth control circuit for realizing constant current control of red light and a seventh control circuit for realizing constant current control of blue light.

[0011] Furthermore, the sixth control circuit is provided with a first control chip; the fourth pin of the first control chip is connected to the gate of the first MOS transistor; the drain of the first MOS transistor is connected to the second pin of the eighth control chip and the anode of the first diode; the cathode of the first diode is connected to the power supply terminal and the first pin of the eighth control chip.

[0012] The first pin of the first control chip is connected to one side of the second MOS transistor and the first variable resistor, respectively.

[0013] Furthermore, the first control chip is model LM321;

[0014] The first MOSFET is model WSF3040; the second MOSFET is model AO3400.

[0015] Furthermore, the seventh control circuit is provided with a seventh control chip; the fourth pin of the seventh control chip is connected to the gate of the sixth MOS transistor; the drain of the sixth MOS transistor is connected to the second pin of the fourth control chip and the anode of the second diode, respectively; the cathode of the second diode is connected to the power supply terminal and the first pin of the fourth control chip, respectively.

[0016] The first pin of the seventh control chip is connected to one side of the sixth MOS transistor and the second variable resistor, respectively.

[0017] Furthermore, the seventh control chip is model LM321; the sixth MOSFET is model WSF3040; and the fifth MOSFET is model AO3400.

[0018] This utility model includes a power supply step-down control circuit for power supply; a first control circuit for data processing and control of various circuit components; a second control circuit electrically connected to the first control circuit for switching between red and blue light source output; a third control circuit for transmitting temperature data is also electrically connected to one side of the first control circuit; and a fourth control circuit for controlling fan cooling; a fifth control circuit for power control is also provided between the first and second control circuits. This integrated circuit design enables red / blue light source switching output; PID intelligent temperature control for air cooling; and multi-parameter synchronous acquisition and protection. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a dual-source laser control circuit according to the present invention;

[0021] Figure 2 This is a schematic diagram of a 5V step-down circuit, which is an embodiment of a dual-source laser control circuit according to this utility model.

[0022] Figure 3 This is a schematic diagram of a 3.3V step-down circuit, which is an embodiment of a dual-source laser control circuit of this utility model.

[0023] Figure 4 This is a schematic diagram of a red light constant current control circuit, which is an embodiment of a dual-source laser control circuit of this utility model.

[0024] Figure 5 This is a schematic diagram of a blue light constant current control circuit, which is an embodiment of a dual-source laser control circuit of this utility model.

[0025] Figure 6 This is a schematic diagram of a power adjustment circuit according to an embodiment of a dual-source laser control circuit of this utility model;

[0026] Figure 7 This is a schematic diagram of a temperature sensing circuit, which is an embodiment of a dual-source laser control circuit according to this utility model.

[0027] Figure 8 This is a schematic diagram of a heat dissipation control circuit according to an embodiment of a dual-source laser control circuit of this utility model;

[0028] Figure 9 This is a schematic diagram of the main control unit circuit (first control circuit) of an embodiment of a dual-source laser control circuit of this utility model.

[0029] In the diagram: U1 - First control chip; U4 - Fourth control chip; U7 - Seventh control chip; U8 - Eighth control chip; U15 - Fifteenth control chip; Q1 - First MOSFET; Q2 - Second MOSFET; D1 - First diode; VR1 - First variable resistor; Q5 - Fifth MOSFET; Q6 - Sixth MOSFET; D2 - Second diode; VR2 - Second variable resistor. Detailed Implementation

[0030] To facilitate a clearer understanding of the purpose, technical solution, and advantages of this utility model, the following description, in conjunction with the accompanying drawings and specific embodiments, will further illustrate this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0031] This utility model can also be implemented or applied through other different specific examples. The details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Secondly, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] like Figures 1-9 As shown, this utility model provides a dual-source laser control circuit, the circuit including a power supply step-down control circuit for realizing power supply; the circuit also includes a first control circuit for processing data and controlling each circuit element; and a second control circuit electrically connected to the first control circuit and used for switching the output of red light source or blue light source.

[0036] The first control circuit is also electrically connected to a third control circuit for transmitting temperature data; and a fourth control circuit for controlling fan cooling; and a fifth control circuit for implementing power control is provided between the first control circuit and the second control circuit.

[0037] The first control circuit includes a fifteenth control chip, one side of which is electrically connected to the first and second pins of the serial communication module via pins eighteen and seventeen. The fifteenth control chip is an STM32F030F4.

[0038] The second control circuit also includes a sixth control circuit for implementing constant current control of red light and a seventh control circuit for implementing constant current control of blue light. The sixth control circuit includes a first control chip; the fourth pin of the first control chip is connected to the gate of a first MOSFET; the drain of the first MOSFET is connected to the second pin of an eighth control chip and the anode of a first diode; the cathode of the first diode is connected to the power supply terminal and the first pin of the eighth control chip.

[0039] The first pin of the first control chip is connected to one side of the second MOSFET and the first variable resistor, respectively. The first control chip is an LM321; the first MOSFET is a WSF3040; and the second MOSFET is an AO3400.

[0040] The seventh control circuit is equipped with a seventh control chip; the fourth pin of the seventh control chip is connected to the gate of the sixth MOS transistor; the drain of the sixth MOS transistor is connected to the second pin of the fourth control chip and the anode of the second diode, respectively; the cathode of the second diode is connected to the power supply terminal and the first pin of the fourth control chip, respectively.

[0041] The first pin of the seventh control chip is connected to one side of the sixth MOS transistor and the second variable resistor, respectively.

[0042] The seventh control chip is model LM321; the sixth MOSFET is model WSF3040; and the fifth MOSFET is model AO3400.

[0043] Specifically, in a specific embodiment of this utility model, a dual-source laser control circuit is provided, namely, an integrated control circuit capable of simultaneously driving a 20W blue laser and a 20W red laser, suitable for multi-wavelength high-power laser applications such as laser processing, medical equipment, and scientific research experiments; the 5V step-down circuit, the input part: the left side of the circuit is marked +5V, indicating that the input voltage is 5V.

[0044] The input is filtered by multiple capacitors (C5, C3, C2, C1), with capacitances of 100nF, 22uF, 22uF, and 100nF, respectively. These capacitors smooth the input voltage, reducing noise and ripple.

[0045] Inductor section: L1 is a 4.7uH inductor used for inductive energy storage in the buck converter.

[0046] Buck converter: U10 and U2 are MP8715 buck converter chips. VIN is the input voltage terminal, connected to one end of inductor L1. SW is the switching terminal, connected to the other end of the inductor.

[0047] EN / SYNC is the enable terminal, used to start and synchronize the converter. BST is the boost terminal, used to control the internal switch. POK is the power OK indicator, used to indicate whether the output voltage is stable. FB is the feedback terminal, connected to the output voltage through a resistor divider network (R12 and R11), used to regulate and stabilize the output voltage.

[0048] Output section: The right side of the circuit is the output voltage section, which is filtered by capacitors C4 (10nF) and C9 (470uF) to smooth the output voltage. R13 is a 10kΩ resistor used in the feedback network to help stabilize the output voltage.

[0049] Grounding section: There are multiple grounding (GND) points in the circuit to provide a stable reference voltage.

[0050] The 3.3V step-down section has an input voltage of +5V. Two capacitors, C11 (100nF) and C10 (22uF), are connected to the input terminal to filter the input voltage and reduce the impact of power supply noise on the circuit.

[0051] The core buck regulator section uses an AMS1117A-3.3V regulator (marked as U13) as its core component. The regulator's VIN pin is connected to the input 5V voltage. The Vss pin is connected to ground (GND) to provide a reference potential for the circuit. The VOUT pin outputs the 3.3V voltage after bucking and regulation.

[0052] Output section: Two capacitors, C12 (22uF) and C13 (100nF), are also connected to the output terminal to further filter the output voltage and ensure the stability and smoothness of the output voltage.

[0053] Grounding section: There are multiple points in the circuit connected to ground (GND) to ensure the normal operation and stability of the circuit.

[0054] In summary, the circuit works as follows: when the input voltage is +5V, it passes through the capacitor at the input terminal for filtering and then enters the AMS1117A-3.3V regulator. The regulator steps down the input 5V voltage and stabilizes it to 3.3V, then filters it through the capacitor at the output terminal, finally outputting a stable 3.3V voltage.

[0055] The constant current drive module, specifically the red light constant current control section, has two +5V power inputs: one supplies the main circuit, and the other supplies the gates of the operational amplifier (U1) and MOSFET (Q1). GND is the circuit's ground terminal.

[0056] Feedback and Regulation Section: U3 is a 10nF capacitor used for filtering and stabilizing the voltage. U2 is a TL431 Zener diode used to provide a reference voltage. VR1 is a 100K potentiometer used to adjust the input voltage, thereby controlling the output current.

[0057] Operational amplifier section: U1 is an LM321 operational amplifier used for amplifying and comparing voltage signals. R1 is a 0.05 ohm resistor used for current sensing.

[0058] MOSFET drive section: Q1 is a WSF3040 MOSFET used for current control switching. D1 is a 5VTVS diode used to protect the circuit from transient voltages.

[0059] Switches and Input Section: SW1 is a switch used for manually controlling the circuit's on and off states. R8, R3, R4, and R5 are 10kΩ resistors used for current limiting and voltage division. Q2 and Q3 are AO3400 MOSFETs used for input signal control.

[0060] Output Section: U8 is an output port connected to ground via R1, used to output control signals. This circuit achieves constant current control of the red LED through a combination of operational amplifier (U1) and MOSFET (Q1). The output current and the switching state of the circuit can be controlled by adjusting the potentiometer (VR1) and switch (SW1). Capacitor (U3) and TVS diode (D1) are used for voltage stabilization and protection circuitry. Supports 1kHz-1MHz frequency input.

[0061] Blue light constant current module: In the power supply section, the +5V power supply is connected to the circuit through resistor R9. GND is the ground terminal of the circuit.

[0062] Voltage Regulation and Reference Voltage Section: U6 (TL431) is a precision bandgap voltage reference source used to provide a stable reference voltage. U5 (10nF) is a capacitor used for filtering and stabilizing the voltage. VR2 (100K ohms) is an adjustable resistor used to regulate the output voltage.

[0063] Operational amplifier section: U7 (LM321) is an operational amplifier used to amplify and adjust signals. Q6 (WSF3040) is a MOSFET used to control current.

[0064] Protection section: D2 (5V TVS) is a transient voltage suppressor diode used to protect the circuit from damage caused by transient voltages. R10 (0.05 ohms) is a small resistor used to measure current.

[0065] MOSFET drive section: Q4 and Q5 (AO3400) are two N-channel MOSFETs used for switching control. R6 and R7 (10k ohms) are resistors used for limiting the base current.

[0066] Input control section: IO is the input control signal. SW2 is a switch used to control the switching state of the circuit.

[0067] Circuit working principle: Reference voltage generation: TL431 generates a stable reference voltage, which can be adjusted via VR2.

[0068] Signal amplification: The LM321 operational amplifier amplifies the input signal and adjusts the output according to the reference voltage.

[0069] MOSFET control: The amplified signal controls the current through MOSFET Q6, while Q4 and Q5 are used for further switching control.

[0070] Current detection and protection: R10 is used to detect current, and D2 is used to protect the circuit from transient voltage.

[0071] The main function of this circuit is to control the output of the operational amplifier by adjusting the reference voltage, thereby controlling the MOSFET and achieving constant current control. It supports input frequencies from 1kHz to 1MHz.

[0072] Power regulation module: U11 interface: power signal and pin input terminals. Among them, pin 1 is the main circuit input power supply, pin 2 is the negative terminal of the input power supply, pin 3 is the PWM / TTL pulse signal used for power control of red / blue laser, and pin 4 is used to select red or blue light. After the main controller collects and processes the data, it controls the switching between red and blue light.

[0073] Temperature Sensing Module: Core Component: DS18B20 Temperature Sensor. The DS18B20 is a digital temperature sensor with three main pins: GND (ground), DQ (data pin), and VDD (power pin). The GND pin is connected to the circuit's common ground to ensure proper sensor operation. The VDD pin is connected to a 3.3V power supply to provide the necessary voltage for the sensor. The DQ pin is used for data communication with the microcontroller, transmitting temperature data.

[0074] The function of resistor R14: Resistor R14 is a 10kΩ resistor connected between the DQ pin and the 3.3V power supply. In this circuit, R14 acts as a pull-up resistor, ensuring that the DQ pin remains high when no other signal is present. The pull-up resistor helps stabilize the voltage levels in the circuit, preventing communication errors caused by signal instability.

[0075] Circuit Connection Instructions: The GND pin of the DS18B20 is directly connected to ground to provide a stable reference potential for the sensor. The VDD pin is connected to a 3.3V power supply to ensure the sensor has sufficient voltage to operate. The DQ pin is connected to the 3.3V power supply through resistor R14, and also to the PA1 pin of the main control circuit for data transmission and reception.

[0076] Circuit operation principle: When temperature data needs to be read, the microcontroller sends a command to the DS18B20 via the DQ pin. After receiving the command, the DS18B20 converts the temperature data into a digital signal and transmits it back to the microcontroller via the DQ pin. The microcontroller then processes and displays the received data, thereby achieving real-time temperature monitoring and control.

[0077] Thermal control module: Power supply and resistor configuration; the circuit uses +5V as the operating power supply. Resistors R15 (100Ω) and R16 (100kΩ) serve as current limiters and voltage dividers in the circuit. R15 is connected between the positive terminal of the power supply and the fan, while R16 is connected between the fan and the collector of transistor Q7.

[0078] The function of transistor Q7: Q7 (CJ3400) is an NPN transistor used as a switching element in a circuit. When the base voltage of the transistor is higher than the emitter voltage, the transistor conducts; otherwise, it is cut off.

[0079] Fan control logic: The start and stop of the fan (FAN) are determined by the on / off state of transistor Q7. When the heat dissipation control module U14 outputs a high-level signal, transistor Q7 is turned on through resistor R15, current flows through the fan, and the fan starts working. When the heat dissipation control module U14 outputs a low-level signal, transistor Q7 is turned off, and the fan stops working.

[0080] Thermal control module U14: U14 is the core of the thermal control module, responsible for outputting control signals based on temperature or other sensor signals. It connects to the base and emitter of transistor Q7 and ground via pins, thereby controlling the fan.

[0081] Overall circuit working principle: The circuit monitors the temperature or receives other control signals through the heat dissipation control module U14. Based on the monitoring results, U14 outputs corresponding PWM signals. These signals are amplified by resistors and transistor Q7, ultimately controlling the start and stop of the fan.

[0082] Main control unit module: Its circuit section mainly shows an STM32F030F4 microcontroller (U15) and a serial communication module (H1).

[0083] Power supply: The 3V3 power supply in the circuit is connected to the VDDA (analog power) and VDD (digital power) pins of the microcontroller through two resistors R17 (100kΩ) and R18 (10kΩ) respectively, providing a stable power supply to the microcontroller.

[0084] Microcontroller core: The STM32F030F4 microcontroller is the core component of the circuit, responsible for processing data and controlling other circuit elements.

[0085] Serial communication interface: The microcontroller's PA9 and PA10 pins are used as TXD (transmit data) and RXD (receive data) pins respectively for UART communication with the serial communication module. The serial communication module's TXD and RXD pins are also connected to the microcontroller's PA9 and PA10 pins respectively, enabling bidirectional data transmission.

[0086] Other connections and components: Pin PA0 is used for acquiring external red and blue light signals. Pin PA1 acquires data from the temperature sensor. Pin PA2 is used to turn the red laser on and off; pin PA3 is used to turn the blue laser on and off. Pin PA4 is used to turn the fan on and off.

[0087] This utility model includes a power supply step-down control circuit for power supply; a first control circuit for data processing and control of various circuit components; a second control circuit electrically connected to the first control circuit for switching between red and blue light source output; a third control circuit for transmitting temperature data is also electrically connected to one side of the first control circuit; and a fourth control circuit for controlling fan cooling; a fifth control circuit for power control is also provided between the first and second control circuits. This integrated circuit design enables red / blue light source switching output; PID intelligent temperature control for air cooling; and multi-parameter synchronous acquisition and protection.

[0088] In other words, in the integrated circuit design of this utility model, the main control board integrates an STM32F030F4 microcontroller and a high-precision ADC module; the communication interface: the UART serial port is reserved for communication with the host computer.

[0089] The technological innovations lie in the red-blue light switching: supporting programmed control (e.g., red light preheating → blue light main output → mixed mode) to avoid light source conflicts15; the heat dissipation solution: PID air cooling with real-time temperature monitoring; and data fusion processing: eliminating sensor noise through a Kalman filter algorithm to improve the accuracy of temperature acquisition. The PWM frequency range of the red-blue light switching drive module is 1kHz-1MHz; the PID algorithm output resolution of the temperature control module reaches 16bit, with a temperature control accuracy of ±0.5℃.

[0090] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-source laser control circuit, the circuit comprising a power supply step-down control circuit for realizing power supply; characterized in that, The circuit also includes a first control circuit for processing data and controlling each circuit element; and a second control circuit electrically connected to the first control circuit and used for switching the output of a red light source or a blue light source. One side of the first control circuit is also electrically connected to a third control circuit for transmitting temperature data; and a fourth control circuit for controlling fan cooling. A fifth control circuit for power control is provided between the first control circuit and the second control circuit.

2. A dual light source laser control circuit according to claim 1, wherein, The first control circuit is equipped with a fifteenth control chip, one side of which is electrically connected to the eighteenth and seventeenth pins and the first and second pins of the serial communication module.

3. A dual light source laser control circuit according to claim 2, wherein, The fifteenth control chip is model STM32F030F4.

4. A dual light source laser control circuit according to claim 1, wherein, The second control circuit is further provided with a sixth control circuit for realizing constant current control of red light and a seventh control circuit for realizing constant current control of blue light.

5. A dual light source laser control circuit according to claim 4, wherein, The sixth control circuit is provided with a first control chip; the fourth pin of the first control chip is connected to the gate of the first MOS transistor; the drain of the first MOS transistor is connected to the second pin of the eighth control chip and the anode of the first diode; the cathode of the first diode is connected to the power supply terminal and the first pin of the eighth control chip. The first pin of the first control chip is connected to one side of the second MOS transistor and the first variable resistor, respectively.

6. A dual light source laser control circuit according to claim 5, wherein, The first control chip is model LM321; The first MOSFET is model WSF3040; the second MOSFET is model AO3400.

7. A dual light source laser control circuit according to claim 4, wherein, The seventh control circuit is equipped with a seventh control chip; the fourth pin of the seventh control chip is connected to the gate of the sixth MOS transistor; the drain of the sixth MOS transistor is connected to the second pin of the fourth control chip and the anode of the second diode, respectively; the cathode of the second diode is connected to the power supply terminal and the first pin of the fourth control chip, respectively. The first pin of the seventh control chip is connected to one side of the fifth MOS transistor and the second variable resistor, respectively.

8. A dual light source laser control circuit according to claim 7, wherein, The seventh control chip is model LM321; The sixth MOSFET is model WSF3040; the fifth MOSFET is model AO3400.

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