Laser heating circuit and heating method

Abstract

The invention discloses a laser heating circuit and a heating method, and the circuit comprises a power supply circuit which is provided with a first grounding end and is used for providing an initial power supply; the main power supply circuit is provided with a third grounding end and is used for converting the initial power supply to obtain a first power supply; the auxiliary power supply circuit is provided with a second grounding end and is used for converting the initial power supply to obtain a second power supply; the main board is used for receiving a heating instruction; the controller is provided with a fourth grounding end and is used for generating a heating control signal according to the heating instruction; the driver is provided with a third grounding end and is used for generating a driving signal in response to the heating control signal; the heating array is provided with a third grounding end and is suitable for responding to a driving signal and emitting a heating light beam; wherein a first type isolator is arranged between the mainboard and the controller, and a second type isolator is arranged between the controller and the driver. By adopting the technical scheme, the operation safety and stability of the laser heating circuit can be improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of laser heating, and in particular to a laser heating circuit and a heating method. Background Art

[0002] Laser heating is the process of heating the material to be heated by laser energy. The working process is as follows: the laser beam is emitted from the laser, transmitted and focused, and irradiated to the surface of the material. Part of it is reflected, and part of it enters the interior of the material and is absorbed by the material, so that the temperature of the surface of the material rises rapidly.

[0003] At present, a laser heating circuit with a heating device is usually used to heat the material to be heated. However, in actual heating, the heating scheme of the existing laser heating circuit still has problems. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a laser heating circuit and a heating method, which can improve the operating safety and stability of the laser heating circuit.

[0005] An embodiment of the present invention provides a laser heating circuit, comprising: A power supply circuit having a first ground terminal for providing an initial power supply; A main power supply circuit having a third ground terminal, used for converting the initial power supply to obtain a first power supply; An auxiliary power supply circuit, having a second ground terminal, for converting the initial power supply to obtain a second power supply; A main board, coupled to the auxiliary power circuit, and configured to receive a heating instruction; A controller having a fourth ground terminal and coupled to the mainboard, and configured to generate a heating control signal according to the heating instruction; a driver, having the third ground terminal and coupled to the main power circuit and the controller respectively, for generating a driving signal in response to the heating control signal; A heating array having the third ground terminal and coupled to the driver, adapted to respond to the driving signal; There is a first type isolator between the mainboard and the controller, and a second type isolator between the controller and the driver.

[0006] In the above embodiment, different grounds are used on the power supply side, the control side and the drive side, and a first type of isolator is provided between the mainboard and the controller, and a second type of isolator is provided between the controller and the driver. This achieves isolation of voltages of different amplitudes, and even if there are abnormal modules, it will not affect the use of other devices, thereby improving the operating safety and stability of the laser heating circuit.

[0007] Optionally, the first type isolator includes a first DCDC converter, and the first DCDC converter has the fourth ground terminal.

[0008] In the above embodiment, by using the first DCDC converter as an isolator, surge current can be prevented from damaging the controller, and a plurality of isolated positive and / or negative output voltages can be generated to provide a suitable voltage for the controller.

[0009] Optionally, the first DCDC converter has a first output branch and a second output branch; The laser heating circuit further includes at least one of the following: A low voltage drop linear regulator has the fourth ground terminal and is respectively coupled to the first output branch and the controller; a temperature sensor, having the fourth ground terminal and coupled to the first output branch and the controller respectively, for detecting the temperature of the mainboard and outputting a temperature detection signal to the controller; The communication interface has the fourth ground terminal and is coupled to the second output branch.

[0010] In the above embodiment, the low voltage difference linear regulator can respond quickly to the voltage change of the first DCDC converter output, thereby generating an output voltage with lower ripple, making the working stability of the controller better; by setting a communication interface, it can be used to connect different devices and support different data transmission and charging functions; by detecting the temperature of the mainboard, the mainboard can always be kept at a temperature that meets the working requirements, further improving the operating safety and stability of the laser heating circuit. In short, while enriching the functions of the laser heating circuit, the operating safety and stability of the laser heating circuit are improved.

[0011] Optionally, the second type isolator includes a digital isolator, and the digital isolator is coupled between the third ground terminal and the fourth ground terminal.

[0012] In the above embodiment, the digital isolator can prevent signal interference, noise propagation and fault transmission, and improve the accuracy of the heating control signal output to the driver.

[0013] Optionally, the digital isolator includes at least one of the following: Optocoupler isolator; Electromagnetic coupling isolator; Capacitor.

[0014] In the above embodiments, isolation can be achieved by adopting any digital isolator, thereby improving the universality of the digital isolator.

[0015] Optionally, the laser heating circuit further includes: a PWM signal generator having the third ground terminal and disposed between the driver and the second type isolator, wherein the PWM signal generator is adapted to generate a control signal having a corresponding duty cycle to the driver according to the heating control signal output by the controller; The second type isolator is also coupled to the driver, and a connecting branch between the second type isolator and the driver has the first ground terminal.

[0016] In the above embodiment, by setting a PWM signal generator, the duty cycle of the control signal can be adjusted in real time, so that the heating array can output a light beam that meets the heating requirement.

[0017] Optionally, the laser heating circuit further includes: a signal sampling circuit, having the third ground terminal and coupled to the driver and the controller respectively, for collecting a driving voltage value and / or a driving current value in a driving signal output by the driver, generating a corresponding sampling signal, and outputting the sampling signal to the controller; The controller is further adapted to adjust the duty cycle of the heating control signal according to the voltage value and / or current value in the sampling signal and a preset voltage value and / or current value.

[0018] In the above embodiment, the driving voltage value and / or driving current value in the driving signal will directly determine the heating temperature of the material to be heated. By setting a signal sampling circuit, the driving voltage value and / or driving current value in the driving signal can be collected, so as to determine whether the driving voltage value and / or driving current value meet the working requirements. In this way, the controller can adjust the duty cycle of the heating control signal according to the voltage value and / or current value in the sampling signal and the preset voltage value and / or current value, so that the heating array can stably emit light according to the set electrical parameters.

[0019] Optionally, the signal sampling circuit includes at least one of a voltage sampling unit and a current sampling unit, wherein: The voltage sampling unit is coupled to the controller and the driver, respectively, and includes: a voltage detector composed of a first transistor, a second transistor and a first capacitor, a first switch, a first operational amplifier, a converter composed of a third transistor and a first resistor, a converter composed of a third transistor and a first resistor, a first current mirror composed of a fourth transistor and a fifth transistor, and a second resistor, wherein: the control ends of the first transistor and the second transistor are both coupled to the controller, and the first transistor and the second transistor are turned on in time-sharing, the first end of the first transistor inputs the driving voltage value, the second end of the first transistor is respectively coupled to the first end of the second transistor, the first end of the first switch, and the first end of the first capacitor; the second end of the second transistor and the second end of the second capacitor are both connected to the third ground terminal; the second terminal of the first switch is coupled to the controller, and the third terminal of the first switch is coupled to the first input terminal of the first operational amplifier; the second input terminal of the first operational amplifier is respectively coupled to the first end of the first resistor and the second end of the third transistor, and the output terminal of the first operational amplifier is coupled to the control terminal of the third transistor; the second terminal of the first resistor is connected to the third ground terminal; the first terminal of the third transistor is respectively coupled to the first end of the fourth transistor, the control terminal of the fourth transistor and the control terminal of the fifth transistor; the second terminal of the fourth transistor is coupled to the second end of the fifth transistor and inputs a bias voltage; the first terminal of the fifth transistor is respectively coupled to the first end of the second resistor and the controller, and the second terminal of the second resistor is connected to the third ground terminal; The current sampling unit is coupled to the controller and the driver respectively, and includes: a second current mirror composed of a sixth transistor and a seventh transistor, a triode as a current detector, a second operational amplifier, and a two-stage inverter composed of an eighth transistor, a ninth transistor, a tenth transistor and an eleventh transistor, wherein: the second end of the sixth transistor, the second end of the seventh transistor, the second end of the eighth transistor and the second end of the tenth transistor are all coupled to the driver, the control end of the sixth transistor, the control end of the seventh transistor, and the first end of the sixth transistor are connected and connected to the third ground terminal; the first end of the seventh transistor is connected to the control end of the sixth transistor and the control end of the seventh transistor, and the first end of the sixth transistor is connected and connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the sixth ... One end is coupled to the collector of the transistor and the first input end of the second operational amplifier respectively; the base and emitter of the transistor are both connected to the third ground terminal; the second input end of the second operational amplifier inputs a reference voltage, and the output end of the second operational amplifier is coupled to the control end of the eighth transistor and the control end of the ninth transistor respectively; the first end of the eighth transistor is coupled to the first end of the ninth transistor, the control end of the tenth transistor, and the control end of the eleventh transistor respectively; the second end of the ninth transistor and the second end of the eleventh transistor are both connected to the third ground terminal; the first end of the tenth transistor and the first end of the eleventh transistor are both coupled to the controller.

[0020] Optionally, the laser heating circuit further includes: the laser heating circuit further includes: a third type isolator located between the signal sampling circuit and the controller, and the third type isolator has a fourth ground terminal and a third ground terminal; The third type isolator includes: an isolation type operational amplifier.

[0021] In the above embodiment, by setting up a third type of isolator, isolation between the signal sampling circuit and the controller can be achieved, and the controller can be protected; and by making the third type of isolator include an isolated operational amplifier, electrical isolation between the input and output can be provided, which can prevent current from flowing directly between circuits, thereby protecting the circuit and the operator from electric shock and circuit damage.

[0022] Optionally, the laser heating circuit further includes: a fourth type isolator having a fifth ground terminal and coupled to the main board and the display module.

[0023] By setting up the fourth type of isolator, on the one hand, isolation between the mainboard and the display module can be achieved, and on the other hand, the power supply can be converted so that the power output to the display module can meet the requirements, so that the operating data of the laser heating circuit can be displayed in real time.

[0024] Correspondingly, an embodiment of the present invention further provides a laser heating method, which is applied to the laser heating circuit described in any of the above embodiments, and the laser heating method includes: Configuring the grounding terminals of the power supply circuit, the main power supply circuit, the auxiliary power supply circuit, the mainboard, the controller, the driver and the heating array so that the power supply circuit has a first grounding terminal, the main power supply circuit, the driver and the heating array have a third grounding terminal, the auxiliary power supply circuit has the third grounding terminal, and the controller has a fourth grounding terminal; Disposing a first type isolator between the mainboard and the controller; providing a second type isolator between the controller and the driver; receiving a heating instruction through the mainboard; generating a heating control signal by the controller in response to the heating instruction; Based on the heating control signal, generating a driving signal through the driver; In response to the driving signal, a heating light beam is emitted through the heating array.

[0025] In the above embodiment, different grounds are used on the power supply side, the control side and the drive side, and a first type of isolator is provided between the mainboard and the controller, and a second type of isolator is provided between the controller and the driver. This achieves isolation of voltages of different amplitudes, and even if there are abnormal modules, it will not affect the use of other devices, thereby improving the operating safety and stability of the laser heating circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a laser heating circuit in the first embodiment of the present invention is shown; Figure 2 A schematic diagram of the structure of a laser heating circuit in a second embodiment of the present invention is shown; Figure 3 A schematic diagram of the structure of a laser heating circuit in a third embodiment of the present invention is shown; Figure 4 A schematic diagram of the structure of a signal sampling circuit in a first embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of a signal sampling circuit in a second embodiment of the present invention is shown; Figure 6 A flow chart of a laser heating method in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0028] As described in the background technology, in actual heating, the existing laser heating solutions still have problems. This is because: in a laser heating circuit, a ground terminal is used between each device or unit in the laser heating circuit. For example, the power supply ground, signal sampling ground and drive control ground are all the same ground. In this way, when one of the systems is abnormal, it will affect the normal operation of other devices or units.

[0029] To solve the above technical problems, an embodiment of the present invention provides a laser heating circuit, comprising: a power supply circuit, having a first ground terminal, for providing an initial power supply; a main power supply circuit, having a third ground terminal, for converting the initial power supply to obtain a first power supply; an auxiliary power supply circuit, having a second ground terminal, for converting the initial power supply to obtain a second power supply; a mainboard, coupled to the auxiliary power supply circuit, for receiving a heating instruction; a controller, having a fourth ground terminal, coupled to the mainboard, for generating a heating control signal according to the heating instruction; a driver, having the third ground terminal, respectively coupled to the main power supply circuit and the controller, for generating a driving signal in response to the heating control signal; a heating array, having the third ground terminal, coupled to the driver, suitable for responding to the driving signal; There is a first type isolator between the mainboard and the controller, and a second type isolator between the controller and the driver.

[0030] Using the laser heating circuit in the embodiment of the present invention, different grounds are used for the power supply side, the control side and the drive side, and a first type of isolator is provided between the mainboard and the controller, and a second type of isolator is provided between the controller and the driver. In this way, isolation of voltages of different amplitudes is achieved. Even if there are abnormal modules, it will not affect the use of other devices, thereby improving the operating safety and stability of the laser heating circuit.

[0031] In order to enable those skilled in the art to better understand and implement the present invention, the specific scheme, principle, advantages and effects of the present invention are described in detail through specific embodiments with reference to the accompanying drawings.

[0032] See also Figure 1 The structure diagram of a laser heating circuit in the first embodiment of the present invention is shown in FIG. Figure 1 As shown, the laser heating circuit may include: The power supply circuit 110 has a first ground terminal PGND for providing an initial power supply; The main power circuit 120 has a third ground terminal PGND2, which is used to convert the initial power supply to obtain a first power supply; The auxiliary power supply circuit 130 has a second ground terminal PGND1, which is used to convert the initial power supply to obtain a second power supply; A main board 140, coupled to the auxiliary power circuit 130, for receiving a heating instruction; The controller 150 has a fourth ground terminal MGND and is coupled to the mainboard 140 and is used to generate a heating control signal according to the heating instruction; The driver 160 has the third ground terminal PGND2 and is coupled to the main power circuit 120 and the controller 150 respectively, and is used to generate a driving signal in response to the heating control signal; The heating array 170 has the third ground terminal PGND2 and is coupled to the driver 160 and is adapted to respond to the driving signal; A first type isolator 180 is provided between the mainboard 140 and the controller 150 , and a second type isolator 190 is provided between the controller 150 and the driver 160 .

[0033] In this embodiment, the working principle of the laser heating circuit is: The main power supply circuit 120 and the auxiliary power supply circuit 130 respectively convert the initial power supply provided by the power supply circuit 110 to obtain a first power supply and a second power supply, respectively (as a non-limiting example, the initial power supply is AC220V / 16A, then after conversion, the first power supply is DC24V / 12A, and the second power supply is DC24V / 2A. In other words, the first type of power supply is converted into the second type of power supply, and the first power supply and the second power supply are different), so as to respectively power circuits with different functions.

[0034] Under the action of the second power supply, the main board 140 can operate normally, so that when receiving a heating instruction from the external input, the heating instruction is output to the controller 150, and by setting a first type of isolator 180 on the main board 140 and the controller 150, on the one hand, the isolation of the main board 140 and the controller 150 can be achieved, and on the other hand, the power supply can be converted so that the power output to the controller 150 can meet the requirements.

[0035] In response to the received heating instruction, the controller 150 can output a heating control signal (such as a PWM signal) with a corresponding duty cycle to the driver 160, and by setting a second type of isolator 190 between the controller 150 and the driver 160, isolation between the controller 150 and the driver 160 can be achieved, interference with the heating control signal can be reduced, and the controller 150 can be protected.

[0036] When receiving the first power supply from the main power circuit 120, the driver 160 can output a driving signal (the size of the driving signal is determined by the heating control signal) to the heating array 170, and the heating array 170 can emit a heating beam to heat the material.

[0037] It can be seen that by adopting different ground terminals and isolation devices, each unit is made independent of each other, thereby improving the operating safety and stability of the laser heating circuit.

[0038] The power supply circuit 110 may be a circuit with a voltage conversion function composed of components such as resistors and capacitors, or may be a power supply, which is not limited in the present invention.

[0039] The main power supply circuit 120 and the auxiliary power supply circuit 130 can be circuits with voltage conversion function composed of components such as resistors and capacitors. The specific implementation of the main power supply circuit 120 and the auxiliary power supply circuit 130 can refer to the existing scheme. Here, only the relationship between the ground terminals of different power supplies is represented.

[0040] The mainboard 140 is used to connect the controller 150 and other components, and the mainboard 140 itself integrates some common and necessary components. For example, the mainboard 140 has slots or interfaces, through which the mainboard 140 can be connected to other components.

[0041] The controller 150 refers to a type of device with a control function. For example, the controller 150 may include a microprocessor MCU. By setting the controller 150, the heating parameters (such as heating time, heating temperature, etc.) of the laser heating circuit during heating can be controlled.

[0042] In some other embodiments, the controller 150 may be implemented by a processing chip such as a central processing unit CPU, a field programmable gate array FPGA, or may be implemented by a specific integrated circuit ASIC or one or more integrated circuits configured to implement the embodiments of the present disclosure.

[0043] The driver 160 is used to provide a stable voltage and current to the heating array 170 according to the heating control signal to ensure that the output power of the heating array 170 is accurately controllable under different working conditions (as a non-limiting example, the working conditions may include at least one of: temperature, humidity and electromagnetic interference ring).

[0044] The heating array 170 may be composed of a plurality of heating devices (as a non-limiting example, the heating devices include at least one of a light emitting diode and a laser diode). By driving the heating devices in different heating areas of the heating array 170, heating of different areas of the material to be heated can be achieved.

[0045] See also Figure 2 The structure diagram of a laser heating circuit in the second embodiment of the present invention is shown in FIG. The same parts as the previous embodiment will not be described again. The difference is that: In this embodiment, the first type isolator 180 may include a first DCDC converter, and the first DCDC converter has the fourth ground terminal MGND.

[0046] By using the first DCDC converter as an isolator, it is possible to prevent surge current from damaging the controller 150 , and to generate a plurality of isolated positive and / or negative output voltages to provide a suitable voltage for the controller 150 .

[0047] As a nonlinear example, after the first DCDC converter, the power output to the controller 150 is 5V / 3A.

[0048] In this embodiment, the first DCDC converter has a first output branch and a second output branch.

[0049] In this case, the laser heating circuit may further include: a low voltage dropout linear regulator 200 having the fourth ground terminal MGND and coupled to the first output branch and the controller 150 respectively.

[0050] The low dropout linear regulator (LDO) 200 can respond quickly to the voltage change of the first DCDC converter output, thereby generating an output voltage with lower ripples, so that the operation stability of the controller 150 is better.

[0051] The laser heating circuit may further include: a communication interface 210 having a fourth ground terminal MGND and coupled to the second output branch.

[0052] By providing the communication interface 210 , it can be used to connect different devices and support different data transmission and charging functions.

[0053] As a non-limiting example, the communication interface 210 may be a USB interface, which enables data transmission and power supply between different devices.

[0054] The laser heating circuit may further include: a temperature sensor 220 having the fourth ground terminal MGND and coupled to the first output branch and the controller 150 respectively, for detecting the temperature of the mainboard 140 and outputting a temperature detection signal to the controller 150 .

[0055] By detecting the temperature of the main board 140 , the main board 140 can always be kept at a temperature that meets the working requirements, further improving the operating safety and stability of the laser heating circuit.

[0056] In addition, the controller 150 may also generate a first control signal based on the temperature included in the temperature detection signal and a preset temperature to adjust the temperature of the mainboard 140 .

[0057] It should be noted that, first, when the laser heating circuit includes both the temperature sensor 220 and the low-voltage dropout linear regulator 200, the low-voltage dropout linear regulator 200 is coupled to the temperature sensor 220, so that the voltage on the temperature sensor 220 has a lower ripple, thereby improving the working stability of the temperature sensor 220; second, in actual applications, the laser heating circuit may include at least one of the low-voltage dropout linear regulator 200, the temperature sensor 220 and the communication interface 210.

[0058] In this embodiment, the second type isolator 190 may include a digital isolator, and the digital isolator is coupled between the third ground terminal PGND2 and the fourth ground terminal MGND.

[0059] The digital isolator can prevent signal interference, noise propagation, and fault transmission, thereby improving the accuracy of the heating control signal output to the driver 160 .

[0060] In this embodiment, the digital isolator includes at least one of an optocoupler isolator, an electromagnetic coupling isolator and a capacitor, wherein: Optocoupler isolators can achieve signal isolation through light-emitting diodes (LEDs) and photoelectric converters (phototransistors or photodiodes). Specifically, the input signal drives the LED to generate a light signal, which is transmitted through the isolation barrier and then converted into an output voltage or current by the photoelectric converter.

[0061] Electromagnetic isolators use a magnetic field coupler (such as a transformer) to achieve signal isolation, where the input signal generates a magnetic field in one winding, which is transferred through the insulating material to the other winding and induces a voltage or current at the output.

[0062] Capacitors achieve isolation by utilizing changes in electric fields.

[0063] See also Figure 3 The structure diagram of a laser heating circuit in the third embodiment of the present invention is shown in FIG. The same parts as the previous embodiments are not described again. The difference is that: See also Figure 3 The laser heating circuit may further include: a signal sampling circuit 230, having the third ground terminal PGND2, and coupled to the driver 160 and the controller 150 respectively, for collecting the driving voltage value and / or driving current value in the driving signal output by the driver 160, generating a corresponding sampling signal, and outputting it to the controller 150.

[0064] Specifically, the driving signal output by the driver 160 directly affects the performance of the heating beam of the heating array 170. More specifically, the voltage value and / or current value in the driving signal will directly determine the heating temperature of the material to be heated. By setting the signal sampling circuit 230, the voltage value and / or current value in the driving signal can be collected, so as to determine whether the voltage value and / or current value meets the working requirements.

[0065] Correspondingly, the controller 150 is further adapted to adjust the duty cycle of the heating control signal according to the voltage value and / or current value in the sampling signal and a preset voltage value and / or current value.

[0066] Specifically, when the controller 150 obtains a sampling signal, it compares the voltage value in the sampling signal with the set voltage value, and / or compares the current value in the sampling signal with the set current value, so that based on the comparison result, it can adjust the duty cycle of the heating control signal output to the driver, thereby changing the driving voltage value and / or driving current value, so that the heating array 170 emits light stably according to the set electrical parameters.

[0067] It should be noted that the set voltage value and current value are determined based on the duty cycle of the heating control signal in the current state, and the set voltage value and current value corresponding to the heating control signal with different duty cycles are different.

[0068] In this embodiment, combined with Figure 3 , see Figure 4 A schematic diagram of the structure of a signal sampling circuit in an embodiment of the present invention is shown in FIG. Figure 4As shown, the signal sampling circuit 230 includes: a voltage sampling unit, coupled to the controller 150 and the driver 160 respectively, and the voltage sampling unit may include: a voltage detector composed of a first transistor M1, a second transistor M2 and a first capacitor C1, a first switch K1, a first operational amplifier OA1, a converter composed of a third transistor M3 and a first resistor R1, a first current mirror composed of a fourth transistor M4 and a fifth transistor M5, and a second resistor R2, wherein: The control ends of the first transistor M1 and the second transistor M2 are both coupled to the controller 150, and the first transistor M1 and the second transistor M2 are turned on in time-sharing mode, the first end of the first transistor M1 inputs the driving voltage value Vin, the second end of the first transistor M1 is coupled to the first end of the second transistor M2, the first end of the first switch K1, and the first end of the first capacitor C1 respectively; the second end of the second transistor M2 and the second end of the second capacitor C2 are both connected to the third ground terminal PGND2; the second end of the first switch K1 is coupled to the controller 150, and the third end of the first switch K1 is coupled to the first input end of the first operational amplifier OA1; the second end of the first operational amplifier OA1 is coupled to the first input end of the first operational amplifier OA1; The input end is respectively coupled to the first end of the first resistor R1 and the second end of the third transistor M3, and the output end of the first operational amplifier OA1 is coupled to the control end of the third transistor M3; the second end of the first resistor R1 is connected to the third ground end; the first end of the third transistor M3 is respectively coupled to the first end of the fourth transistor M4, the control end of the fourth transistor M4 and the control end of the fifth transistor M5; the second end of the fourth transistor M4 is coupled to the second end of the fifth transistor M5, and the bias voltage Vb is input; the first end of the fifth transistor M5 is respectively coupled to the first end of the second resistor R2 and the controller 150, and the second end of the second resistor R2 is connected to the third ground end PGND2.

[0069] When it is necessary to execute the detection process of the driving voltage value Vin, the controller 150 outputs a first control signal to turn on the first transistor M1, and outputs a second control signal to turn off the second transistor M2. At this time, the first switch K1 is in an off state, so that under the action of the driving voltage value Vin, the first capacitor C1 can be charged. When the voltage on the first capacitor C1 reaches a certain value, the first switch K1 is triggered, so that the voltage value of the first input terminal of the first operational amplifier OA1 is Vin. Based on the characteristics of the first operational amplifier OA1, the potentials of the first input terminal and the second input terminal of the first operational amplifier OA1 are the same, so that the voltage output to the first resistor R1 is Vin, and a detection current can be generated on the first resistor R1.

[0070] When the third transistor M3 is turned on, the detection current can be mirrored (mirror ratio is 1:1) to the second resistor R2 through the fourth transistor M4 and the fifth transistor M5, so that the voltage output to the controller 150 is the product of the detection current and the resistance value of the second resistor R2. By comparing the product value with the preset voltage, the duty cycle of the heating control signal output to the driver 160 can be adjusted, thereby changing the driving voltage value, so that the heating array 170 emits light stably according to the set voltage parameters.

[0071] When the first switch K1 is triggered, the states of the first control signal and the second control signal change, so that the first transistor M1 is in an off state and the second transistor M2 is in an off state, so that the first capacitor C1 can be discharged through the second transistor M2, so that the first switch K1 is in an off state.

[0072] It should be noted that, in actual operation, the voltage drop of the second resistor R2 needs to be converted into an analog signal, which is not illustrated here.

[0073] In this embodiment, combined with Figure 3 , see Figure 5 FIG. 1 is a schematic diagram of another signal sampling circuit in an embodiment of the present invention. Figure 5 As shown, the signal sampling circuit 230 may include: a current sampling unit, coupled to the controller 150 and the driver 160 respectively, the current sampling unit including: a second current mirror composed of a sixth transistor M6 and a seventh transistor M7, a transistor Q1 as a current detector, a second operational amplifier OA2, and a two-stage inverter composed of an eighth transistor M8, a ninth transistor M9, a tenth transistor M10 and an eleventh transistor M11, wherein: The second end of the sixth transistor M6, the second end of the seventh transistor M7, the second end of the eighth transistor M8 and the second end of the tenth transistor M10 are all coupled to the driver 160 to obtain the driving current value, the control end of the sixth transistor M6, the control end of the seventh transistor M7, and the first end of the sixth transistor M6 are connected and connected to the third ground terminal PGND2; the first end of the seventh transistor M7 is coupled to the collector of the transistor Q1 and the first input end of the second operational amplifier OA2 respectively; the base and emitter of the transistor Q1 are both connected to the third ground terminal PGND2; the second The reference voltage Vref is input to the second input terminal of the operational amplifier OA2, and the output terminal of the second operational amplifier OA2 is coupled to the control terminal of the eighth transistor M8 and the control terminal of the ninth transistor M9 respectively; the first terminal of the eighth transistor M8 is coupled to the first terminal of the ninth transistor M9, the control terminal of the tenth transistor M10, and the control terminal of the eleventh transistor M11 respectively; the second terminal of the ninth transistor M9 and the second terminal of the eleventh transistor M11 are both connected to the third ground terminal PGND2; the first terminal of the tenth transistor M10 and the first terminal of the eleventh transistor M11 are both coupled to the controller 150.

[0074] The second current mirror composed of the sixth transistor M6 and the seventh transistor M7 can mirror the driving current value to the transistor Q1, thereby generating a detection voltage in the transistor Q1. By comparing the detection voltage with the reference voltage Vref, the comparison signal output to the first inverter (composed of the eighth transistor M8 and the ninth transistor M9) has different states, and then the current detection signal output to the controller 150 is consistent with the comparison signal through the first inverter and the second inverter (composed of the tenth transistor M10 and the eleventh transistor M11), so that the controller 150 can output the duty cycle of the heating control signal to the driver 160 according to the current detection signal, thereby changing the driving current value, so that the heating array 170 emits light stably according to the set current parameters.

[0075] In this embodiment, see Figure 3 The laser heating circuit may further include: a third type isolator 240 located between the signal sampling circuit 230 and the controller 150, and the third type isolator 240 has a fourth ground terminal MGND and a third ground terminal PGND2.

[0076] By providing the third type isolator 240 , isolation between the signal sampling circuit 230 and the controller 150 can be achieved, and the controller 150 can be protected.

[0077] In this embodiment, the third type isolator 240 may include: an isolated operational amplifier (specific structure), which can provide electrical isolation between input and output, prevent direct flow of current between circuits, and thus protect circuits and operators from electric shock and circuit damage.

[0078] In this embodiment, the laser heating circuit may further include: a PWM signal generator 250, having a third ground terminal PGND2, and arranged between the driver 160 and the second type isolator 190, and the PWM signal generator is suitable for generating a control signal with a corresponding duty cycle to the driver 160 according to the heating control signal output by the controller 150.

[0079] By setting a PWM signal generator, the duty cycle of the control signal can be adjusted in real time, so that the heating array 170 can output a light beam that meets the heating requirements.

[0080] In this case, the second type isolator 190 is also coupled to the driver 160 , and the connecting branch between the second type isolator 190 and the driver 160 has the first ground terminal PGND.

[0081] In this embodiment, the laser heating circuit further includes: a fourth type isolator 250 having a fifth ground terminal GND1 and coupled to the mainboard 140 and the display module 260 .

[0082] In other words, by setting the fourth type isolator 250, on the one hand, isolation between the mainboard 140 and the display module 260 (such as a display screen) can be achieved, and on the other hand, the power supply can be converted so that the power output to the display module 260 can meet the requirements, thereby enabling the operating data of the laser heating circuit to be displayed in real time.

[0083] In this embodiment, the fourth type isolator 250 may include a second DCDC converter. By adopting the first DCDC converter as an isolator, it can prevent surge current from damaging the display module 260, and can generate multiple isolated positive and / or negative output voltages to provide a suitable voltage for the display module 260.

[0084] It can be understood that the above describes multiple implementation schemes provided by the embodiments of the present invention, and the various optional methods introduced in each implementation scheme can be combined and cross-referenced with each other without conflict, thereby extending a variety of possible implementation schemes, which can all be regarded as implementation schemes disclosed and invented by the present invention.

[0085] An embodiment of the present invention further provides a laser heating method, which can be applied to the laser heating circuit described in any of the aforementioned examples to control the heating process of the laser heating circuit.

[0086] See also Figure 6 A laser heating method in an embodiment of the present invention is shown, Figure 6 As shown, the following steps can be performed: Step A, configuring the grounding terminals of the power supply circuit, the main power supply circuit, the auxiliary power supply circuit, the mainboard, the controller, the driver and the heating array, so that the power supply circuit has a first grounding terminal, the main power supply circuit, the driver and the heating array have a third grounding terminal, the auxiliary power supply circuit has the third grounding terminal, and the controller has a fourth grounding terminal; Step B, providing a first type isolator between the mainboard and the controller; Step C, providing a second type isolator between the controller and the driver; Step D, receiving a heating instruction through the mainboard; Step E, generating a heating control signal by the controller in response to the heating instruction; Step F, generating a driving signal through the driver based on the heating control signal; Step G, emitting a heating light beam through the heating array in response to the driving signal.

[0087] It should be noted that, in the specific execution steps, the execution order of step B and step C can be changed, as long as steps B and C are executed before step D is executed.

[0088] Therefore, by adopting the laser heating method in the above example, different grounds are used on the power supply side, the control side and the drive side, and a first type of isolator is provided between the mainboard and the controller, and a second type of isolator is provided between the controller and the driver. In this way, isolation of voltages of different amplitudes is achieved. Even if there are abnormal modules, it will not affect the use of other devices, thereby improving the operating safety and stability of the laser heating circuit.

[0089] It is understood that the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined by the terms "first", "second", etc. may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or indicate importance. It is understood that the terms used in this way are interchangeable where appropriate so that the embodiments of the invention described herein can be implemented in an order other than those illustrated or described herein.

[0090] Although the embodiments of the present invention are disclosed above, the invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A laser heating circuit, It is characterized in that include: A power supply circuit having a first ground terminal for providing an initial power supply; A main power supply circuit having a third ground terminal, used for converting the initial power supply to obtain a first power supply; An auxiliary power supply circuit, having a second ground terminal, for converting the initial power supply to obtain a second power supply; A main board, coupled to the auxiliary power circuit, and configured to receive a heating instruction; A controller having a fourth ground terminal and coupled to the mainboard, and configured to generate a heating control signal according to the heating instruction; a driver, having the third ground terminal and coupled to the main power circuit and the controller respectively, for generating a driving signal in response to the heating control signal; A heating array having the third ground terminal and coupled to the driver, adapted to respond to the driving signal; There is a first type isolator between the mainboard and the controller, and a second type isolator between the controller and the driver.

2. The laser heating circuit according to claim 1, It is characterized in that The first type isolator includes a first DCDC converter, and the first DCDC converter has the fourth ground terminal.

3. The laser heating circuit according to claim 2, It is characterized in that The first DCDC converter has a first output branch and a second output branch; The laser heating circuit further includes at least one of the following: A low voltage drop linear regulator has the fourth ground terminal and is coupled to the first output branch and the controller respectively; a temperature sensor, having the fourth ground terminal and coupled to the first output branch and the controller respectively, for detecting the temperature of the mainboard and outputting a temperature detection signal to the controller; The communication interface has the fourth ground terminal and is coupled to the second output branch.

4. The laser heating circuit according to claim 1, It is characterized in that The second type isolator includes a digital isolator coupled between the third ground terminal and the fourth ground terminal.

5. The laser heating circuit according to claim 4, It is characterized in that The digital isolator includes at least one of the following: Optocoupler isolator; Electromagnetic coupling isolator; Capacitor.

6. The laser heating circuit according to claim 1 or 4, It is characterized in that The laser heating circuit further includes: a PWM signal generator having the third ground terminal and arranged between the driver and the second type isolator, the PWM signal generator being adapted to generate a control signal having a corresponding duty cycle to the driver according to the heating control signal output by the controller; The second type isolator is also coupled to the driver, and a connecting branch between the second type isolator and the driver has the first ground terminal.

7. The laser heating circuit according to claim 1, It is characterized in that The laser heating circuit also includes: a signal sampling circuit, having the third ground terminal and coupled to the driver and the controller respectively, for collecting a driving voltage value and / or a driving current value in a driving signal output by the driver, generating a corresponding sampling signal, and outputting the sampling signal to the controller; The controller is further adapted to adjust the duty cycle of the heating control signal according to the voltage value and / or current value in the sampling signal and a preset voltage value and / or current value.

8. The laser heating circuit according to claim 7, It is characterized in that The signal sampling circuit includes at least one of a voltage sampling unit and a current sampling unit, wherein: The voltage sampling unit is coupled to the controller and the driver, respectively, and includes: a voltage detector composed of a first transistor, a second transistor and a first capacitor, a first switch, a first operational amplifier, a converter composed of a third transistor and a first resistor, a converter composed of a third transistor and a first resistor, a first current mirror composed of a fourth transistor and a fifth transistor, and a second resistor, wherein: the control ends of the first transistor and the second transistor are both coupled to the controller, and the first transistor and the second transistor are turned on in time-sharing, the first end of the first transistor inputs the driving voltage value, the second end of the first transistor is respectively coupled to the first end of the second transistor, the first end of the first switch, and the first end of the first capacitor; the second end of the second transistor and the second end of the second capacitor are both connected to the third ground terminal; the second terminal of the first switch is coupled to the controller, and the third terminal of the first switch is coupled to the first input terminal of the first operational amplifier; the second input terminal of the first operational amplifier is respectively coupled to the first end of the first resistor and the second end of the third transistor, and the output terminal of the first operational amplifier is coupled to the control terminal of the third transistor; the second terminal of the first resistor is connected to the third ground terminal; the first terminal of the third transistor is respectively coupled to the first end of the fourth transistor, the control terminal of the fourth transistor and the control terminal of the fifth transistor; the second terminal of the fourth transistor is coupled to the second end of the fifth transistor and inputs a bias voltage; the first terminal of the fifth transistor is respectively coupled to the first end of the second resistor and the controller, and the second terminal of the second resistor is connected to the third ground terminal; The current sampling unit is coupled to the controller and the driver respectively, and includes: a second current mirror composed of a sixth transistor and a seventh transistor, a triode as a current detector, a second operational amplifier, and a two-stage inverter composed of an eighth transistor, a ninth transistor, a tenth transistor and an eleventh transistor, wherein: the second end of the sixth transistor, the second end of the seventh transistor, the second end of the eighth transistor and the second end of the tenth transistor are all coupled to the driver, the control end of the sixth transistor, the control end of the seventh transistor, and the first end of the sixth transistor are connected and connected to the third ground terminal; the first end of the seventh transistor is connected to the control end of the sixth transistor and the control end of the seventh transistor, and the first end of the sixth transistor is connected and connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the seventh transistor is connected to the control end of the seventh transistor and the first end of the sixth transistor is connected to the third ground terminal; the second end of the sixth ... One end is coupled to the collector of the transistor and the first input end of the second operational amplifier respectively; the base and emitter of the transistor are both connected to the third ground terminal; the second input end of the second operational amplifier inputs a reference voltage, and the output end of the second operational amplifier is coupled to the control end of the eighth transistor and the control end of the ninth transistor respectively; the first end of the eighth transistor is coupled to the first end of the ninth transistor, the control end of the tenth transistor, and the control end of the eleventh transistor respectively; the second end of the ninth transistor and the second end of the eleventh transistor are both connected to the third ground terminal; the first end of the tenth transistor and the first end of the eleventh transistor are both coupled to the controller.

9. The laser heating circuit according to claim 7, It is characterized in that The laser heating circuit further includes: a third type isolator located between the signal sampling circuit and the controller, and the third type isolator has the fourth ground terminal and the third ground terminal; The third type isolator includes: an isolation type operational amplifier.

10. The laser heating circuit according to claim 1, It is characterized in that The laser heating circuit further includes: a fourth type isolator having a fifth ground terminal and coupled to the main board and the display module.

11. A laser heating method, It is characterized in that Applicable to the laser heating circuit according to any one of claims 1 to 10, the laser heating method comprising: Configuring the grounding terminals of the power supply circuit, the main power supply circuit, the auxiliary power supply circuit, the mainboard, the controller, the driver and the heating array so that the power supply circuit has a first grounding terminal, the main power supply circuit, the driver and the heating array have a third grounding terminal, the auxiliary power supply circuit has the third grounding terminal, and the controller has a fourth grounding terminal; Disposing a first type isolator between the mainboard and the controller; providing a second type isolator between the controller and the driver; receiving a heating instruction through the mainboard; generating a heating control signal by the controller in response to the heating instruction; Based on the heating control signal, generating a driving signal through the driver; In response to the driving signal, a heating light beam is emitted through the heating array.

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