Laser drive control circuit

Abstract

This disclosure discloses a laser drive control circuit. Only when a foot switch circuit outputs a foot signal will the digital-to-analog conversion circuit output a corresponding operating voltage setting signal to the constant current output circuit, thereby controlling the operating current and output power of the laser. In the event of a control circuit failure, the foot switch circuit can be used to control the constant current output circuit to stop output, thereby improving the safety of the laser. Furthermore, the laser drive control circuit provided by this disclosure can cause the laser to output different powers by pressing different pedals in the foot switch circuit, thereby enabling safe and rapid switching of laser power.

Description

Technical Field

[0001] The present disclosure generally relates to the field of lasers and, more particularly, to a laser driving control circuit. Background Art

[0002] Due to the advantages of laser therapy, such as short surgical time, minimal trauma, and high control precision, medical lasers have been widely used in cosmetic surgery, surgery, and brain treatment. In particular, medical lasers, capable of generating varying laser powers, are suitable for different surgical scenarios or procedures, making them widely adopted by various medical institutions. At the same time, in practical applications, the demand for safe and rapid switching between different laser powers, as well as protective control, is also increasing.

[0003] In traditional applications, the safe and rapid switching of medical laser power and protection control rely on the output of analog signals and logical judgment of the controller, which poses the risk of uncontrollable treatment if the controller loses control.

[0004] In view of this, there is an urgent need to provide a solution that can improve the safety of medical laser use. Summary of the Invention

[0005] In order to at least solve one or more of the technical problems mentioned above, the present disclosure proposes a laser drive control circuit, which uses a foot switch circuit to achieve safe and rapid switching of the laser's corresponding gradient power output to improve the safety of laser use.

[0006] The disclosed embodiment provides a laser drive control circuit for performing gradient power drive control on a laser, comprising: a control circuit, a digital-to-analog conversion circuit, a switching power supply circuit, a foot switch circuit, and a constant current output circuit; the control circuit is connected to the digital-to-analog conversion circuit and the switching power supply circuit, respectively, and is configured to send a power enable signal to the switching power supply circuit by sending a plurality of operating voltage setting signals to the digital-to-analog conversion circuit; the foot switch circuit is connected to the digital-to-analog conversion circuit, and is configured to send a foot signal to the digital-to-analog conversion circuit, and the foot signal is configured to turn on or off the gradient power output of the laser; the digital-to-analog conversion circuit is further connected to the constant current output circuit, and is configured to receive a plurality of operating voltage setting signals; and when receiving the foot signal, is configured to select a corresponding operating voltage setting signal according to the foot signal and send the foot signal to the constant current output circuit. The laser is output from a circuit, and different operating voltage setting signals correspond to different gradient powers of the laser; the constant current output circuit is connected to the laser, and is also used to generate an operating current corresponding to the operating voltage setting signal and provide it to the laser to achieve the output of the corresponding gradient power; the switching power supply circuit is also connected to the laser, and controls the power on and off of the laser under the control of the power enable signal; the foot switch circuit is also connected to the control circuit; the control circuit is also used to send a foot enable signal to the foot switch circuit, and the foot enable signal is used to control the operating mode of the foot switch circuit, and the operating mode includes a normal use mode and a detection mode; the foot switch circuit is also used to switch to the operating mode corresponding to the foot enable signal when receiving the foot enable signal, and to send a switch state signal to the control circuit.

[0007] In a specific embodiment of the present disclosure, the control circuit is further configured to detect the foot switch circuit according to the switch state signal when the foot switch circuit enters a detection mode.

[0008] In a specific embodiment of the present disclosure, the digital-to-analog conversion circuit includes: a setting module, a selection module and an output module; the setting module is connected to the control circuit and is used to receive multiple working voltage setting signals sent by the control circuit; the selection module is respectively connected to the foot switch circuit, the setting module and the output module, and is used to select the corresponding working voltage setting signal from the setting module according to the foot signal when receiving the foot signal and output it to the output module; the output module is used to output the working voltage setting signal selected by the selection module to the constant current output circuit.

[0009] In a specific embodiment of the present disclosure, the foot switch circuit includes: a bus buffer, a NOT gate logic chip, a JK trigger, a state switch and multiple power switches; the selection module includes: a multiple-select-one analog switch chip; the input end of the bus buffer is connected to the state switch, the control end of the bus buffer is connected to the output end of the NOT gate logic chip, and the output end of the bus buffer is connected to the control end of the JK trigger; the input end of the NOT gate logic chip is connected to the control circuit for receiving the foot enable signal sent by the control circuit; the first input end, The second input terminal and the reset terminal are connected to the working power supply, and the set terminal of the JK trigger is connected to the control circuit for receiving the foot enable signal sent by the control circuit; the control terminal of the multi-select analog switch chip is connected to the inverting output terminal of the JK trigger, the multiple selection input terminals of the multi-select analog switch chip are connected one by one to multiple power switches, the output terminal of the multi-select analog switch chip is connected to the output module, and the signal input terminal of the multi-select analog switch chip is connected to the setting module; the status switch is also connected to the control circuit, and multiple power switches are respectively connected to the control circuit.

[0010] In a specific embodiment of the present disclosure, the setting module has an internal storage function for storing multiple operating voltage setting signals sent by the control circuit.

[0011] In a specific embodiment of the present disclosure, it also includes: a protection circuit; the protection circuit is connected to the digital-to-analog conversion circuit, the constant current output circuit and the plug-in port of the laser; the digital-to-analog conversion circuit is also used to send the operating voltage setting signal it wants to output to the constant current output circuit to the protection circuit; the constant current output circuit is also used to send an actual operating voltage signal to the protection circuit; the protection circuit is used to detect the port plug-in status of the laser, and determine whether the laser will overcurrent based on the operating voltage setting signal and the actual operating voltage signal it receives, and when the port plug-in status is normal and the laser will not overcurrent, send a process signal to the digital-to-analog conversion circuit; the digital-to-analog conversion circuit is used to select the corresponding operating voltage setting signal according to the foot signal, and output the selected operating voltage setting signal to the constant current output circuit when receiving the process signal.

[0012] In a specific embodiment of the present disclosure, the protection circuit includes: a temperature sensor plug-in protection circuit, an optical fiber plug-in protection circuit and an overcurrent protection circuit; the temperature sensor plug-in protection circuit is connected to the temperature sensor plug-in port, and is used to detect the plug-in status of the temperature sensor plug-in port; the optical fiber plug-in protection circuit is connected to the optical fiber plug-in port, and is used to detect the plug-in status of the optical fiber plug-in port; the overcurrent protection circuit is respectively connected to the digital-to-analog conversion circuit and the constant current output circuit, and is used to receive the actual working voltage signal and the working voltage setting signal sent by the digital-to-analog conversion circuit, and determine whether the laser will overcurrent based on the working voltage setting signal and the actual working voltage signal received.

[0013] In a specific embodiment of the present disclosure, the temperature sensor plug-in protection circuit includes: a first resistor, a second resistor, a third resistor, a first switch tube and an input terminal; the emitter of the first switch tube, the first resistor, the second resistor and the base of the first switch tube are connected in sequence, and the connection end of the first resistor and the second resistor is connected to the input terminal; the input terminal is also connected to the temperature sensor plug-in port; the third resistor is arranged between the collector of the first switch tube and the ground, and the connection end of the third resistor and the collector of the first switch tube serves as the output end of the plug-in protection circuit.

[0014] In a specific embodiment of the present disclosure, the input terminal is a thermistor; it also includes: an over-temperature protection circuit; the over-temperature protection circuit includes a first follower, a first comparator, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a first capacitor; the positive input terminal of the first follower is connected to the connection terminal of the first resistor and the second resistor, and the negative input terminal of the first follower is connected to the output terminal of the first follower; the output terminal of the first follower is connected to the positive input terminal of the first comparator via the fourth resistor, the negative input terminal of the first comparator is connected to the common terminal of the fifth resistor and the sixth resistor, and the output terminal of the first comparator serves as the output terminal of the over-temperature protection circuit; the fifth resistor and the sixth resistor are connected in series between the working power supply and the ground; the seventh resistor is arranged between the output terminal of the first comparator and the working power supply; the first capacitor is arranged between the output terminal of the first comparator and the ground.

[0015] In a specific embodiment of the present disclosure, the optical fiber plug-in protection circuit includes: a photoelectric sensor, a first amplifier, a second comparator, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, and a third capacitor; the input end of the photoelectric sensor is used to receive an optical signal from a fiber plug-in port, and the output end of the photoelectric sensor is connected to the negative input end of the first amplifier; the positive input end of the first amplifier is connected to the constant current output circuit for receiving the actual working voltage signal sent by the constant current output circuit, and the eighth resistor is connected in series between the negative input end of the first amplifier and the output end of the first amplifier; the output end of the first amplifier is connected to the positive input end of the second comparator via the ninth resistor, the negative input end of the second comparator is connected to the common end of the tenth resistor and the eleventh resistor, and the output end of the second comparator serves as the output end of the optical fiber plug-in protection circuit; the tenth resistor and the eleventh resistor are connected in series between the working power supply and ground; the twelfth resistor is arranged between the output end of the second comparator and the working power supply; the second capacitor is arranged between the output end of the second comparator and ground; and the third capacitor is arranged between the positive input end of the second comparator and ground.

[0016] In a specific embodiment of the present disclosure, the overcurrent protection circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a second amplifier and a third comparator; one end of the thirteenth resistor is connected to the output end of the digital-to-analog conversion circuit, and the other end of the thirteenth resistor is connected to the positive phase input end of the second amplifier; the negative phase input end of the second amplifier is grounded via the fourteenth resistor, the fifteenth resistor is arranged between the negative phase input end of the second amplifier and the output end of the second amplifier, and the sixteenth resistor is arranged between the output end of the second amplifier and the positive phase input end of the third comparator; the positive phase input end of the third comparator is connected to the constant current output circuit via the seventeenth resistor to receive the actual working voltage signal of the constant current output circuit; the output end of the third comparator serves as the output end of the overcurrent protection circuit.

[0017] In a specific embodiment of the present disclosure, it also includes: a power delay circuit and an electrostatic protection circuit; the power delay circuit is respectively connected to the control circuit and the switching power supply circuit, and is used to receive the power enable signal sent by the control circuit, and send the power enable signal to the switching power supply circuit after delay; the electrostatic protection circuit is respectively connected to the control circuit and the laser, and is used to short-circuit the anode and cathode of the laser when the power enable signal is not received, and disconnect the anode and cathode of the laser when the power enable signal is received.

[0018] In a specific embodiment of the present disclosure, it also includes: an enable power supply circuit; the enable power supply circuit is respectively connected to the control circuit, the foot switch circuit and the switching power supply circuit, and is used to send the power enable signal to the switching power supply circuit when receiving the foot signal sent by the foot switch circuit and the power enable signal sent by the control circuit.

[0019] In a specific embodiment of the present disclosure, the foot switch circuit includes: a first XOR logic circuit; the output end of each power switch of the foot switch circuit is connected to the input end of the first XOR logic circuit, and the output end of the first XOR logic circuit is connected to the enable power supply circuit.

[0020] In a specific embodiment of the present disclosure, the control circuit is also used to send a modulation signal to the digital-to-analog conversion circuit; the digital-to-analog conversion circuit is used to select the presentation form of the working voltage setting signal corresponding to the foot signal according to the modulation signal, and the presentation form includes: a pulse signal and a continuous signal.

[0021] In a specific embodiment of the present disclosure, the foot switch circuit is also used to send a switch status signal to the control circuit; the control circuit is also used to send a power enable signal to the power circuit when the switch status signal indicates that the foot switch circuit is in a working state.

[0022] In a specific embodiment of the present disclosure, the foot switch circuit includes: a second XOR logic circuit; the output end of each power switch of the foot switch circuit is connected to the input end of the second XOR logic circuit, and the output end of the second XOR logic circuit is connected to the control circuit.

[0023] In a specific embodiment of the present disclosure, the protection circuit is also connected to the control circuit; the protection circuit is used to detect the port plug-in status of the laser and the status of the control circuit, and sends a process signal to the digital-to-analog conversion circuit when the port plug-in status is normal, the laser will not overcurrent, and the status of the control circuit is normal.

[0024] The disclosed embodiments provide a laser drive control circuit in which, only when the foot switch circuit outputs a foot signal, does the digital-to-analog conversion circuit output a corresponding operating voltage setting signal to the constant current output circuit, thereby controlling the operating current and output gradient power of the laser. In the event of a control circuit failure, the foot switch circuit can be used to control the constant current output circuit to stop output, thereby improving the safety of the laser. Furthermore, the disclosed laser drive control circuit allows the laser to output corresponding gradient powers by pressing different pedals in the foot switch circuit, thereby enabling safe and rapid switching of the laser gradient power. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0026] Figure 1 A block diagram of a laser driving control circuit according to an embodiment of the present disclosure is shown;

[0027] Figure 2 A block diagram of another laser driving control circuit according to an embodiment of the present disclosure is shown;

[0028] Figure 3 A schematic diagram showing a foot switch circuit in a laser drive control circuit according to an embodiment of the present disclosure is shown;

[0029] Figure 4 A partial schematic diagram of a foot switch circuit and a digital-to-analog conversion circuit in a laser driving control circuit according to an embodiment of the present disclosure is shown;

[0030] Figure 5 A schematic diagram showing an optical fiber plugging and unplugging protection circuit in a laser driving control circuit according to an embodiment of the present disclosure is shown;

[0031] Figure 6 A schematic diagram showing a temperature sensor plug-in protection circuit and an over-temperature protection circuit in a laser drive control circuit according to an embodiment of the present disclosure is shown;

[0032] Figure 7 A schematic diagram of a laser driving control circuit according to an embodiment of the present disclosure is shown;

[0033] Figure 8 A schematic diagram of a protection circuit in a laser driving control circuit according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of this disclosure in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this disclosure, not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this disclosure.

[0035] It should be understood that the terms “include” and “comprising” used in the specification and claims of the present disclosure indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terminology used in this disclosure is for the purpose of describing specific embodiments only and is not intended to limit the disclosure. As used in this disclosure and the claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should be further understood that the term "and / or" as used in this disclosure and the claims refers to any and all possible combinations of one or more of the associated listed items, including and including these combinations.

[0037] As used in this specification and claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0038] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0039] Figure 1 A block diagram of a laser driving control circuit to which the embodiments of the present disclosure can be applied is shown. Figure 1 The laser drive control circuit shown is used to perform gradient power drive control on the laser. Figure 1 As shown, the laser drive control circuit includes: a control circuit 101, a digital-to-analog conversion circuit 102, a switching power supply circuit 103, a foot switch circuit 104, and a constant current output circuit 105. The laser is a semiconductor laser, and its operating current and output gradient power can be set as needed. Different operating currents correspond to different output gradient powers. Gradient power refers to the different optical output powers that the laser can output, with each optical output power increasing or decreasing. The switching power supply circuit 103 is the power supply circuit for the laser, and the constant current output circuit 105 determines the operating current of the laser.

[0040] Specifically, the control circuit 101 is connected to the digital-to-analog conversion circuit 102 and the switching power supply circuit 103, respectively. The digital-to-analog conversion circuit 102 is further connected to the foot switch circuit 104 and the constant current output circuit 105, respectively. The switching power supply circuit 103 and the constant current output circuit 105 are further connected to the laser 106, respectively. The control circuit can be a control device with signal and data processing capabilities, such as an FPGA (Field Programmable Gate Array) or an MCU (Microcontroller Unit). In actual applications, the laser 106 can be a medical laser that can output lasers with different gradient powers. The specific output gradient power depends on the actual product and usage scenario.

[0041] Furthermore, the control circuit 101 is configured to send multiple operating voltage setting signals to the digital-to-analog conversion circuit 102 and a power enable signal to the switching power supply circuit 103. The foot switch circuit 104 is configured to send a foot signal to the digital-to-analog conversion circuit 102. The operating voltage setting signal is also referred to as the SetPower signal, the power enable signal is also referred to as the PowerEn signal, and the foot signal is also referred to as the FootS signal. The FootS signal is used to turn the gradient power output of the laser 106 on or off. In other words, different FootS signals ultimately cause the laser 106 to emit laser light with different gradient powers. In actual use, the control circuit 101 can send multiple operating voltage setting signals to the digital-to-analog conversion circuit 102 via a bus. More specifically, the control circuit 101 can use a communication bus protocol such as the IIC (Inter-Integrated Circuit) protocol or the SPI (Serial Peripheral Interface) protocol to send multiple operating voltage setting signals to the digital-to-analog conversion circuit 102. It should be noted that the control circuit 101 sends a digital signal via the bus, and the digital-to-analog conversion circuit 102 needs to perform digital-to-analog conversion on the received digital signal to obtain multiple operating voltage setting signals in the form of analog signals.

[0042] Furthermore, the digital-to-analog conversion circuit 102 is configured to receive multiple operating voltage setting signals and foot pedal signals sent by the control circuit 101. The digital-to-analog conversion circuit is further configured to, upon receiving the foot pedal signal, select a corresponding operating voltage setting signal based on the foot pedal signal and output the selected operating voltage setting signal to the constant current output circuit. Different operating voltage setting signals correspond to different gradient powers of the laser. In practical applications, the digital-to-analog conversion circuit 102 is directly connected to each power output pin of the foot pedal circuit 104 to obtain the corresponding foot pedal signal when the foot pedal is depressed. It should be noted that when the foot pedal signal is a signal for shutting down the gradient power output of the laser, the gradient power output of the laser is zero. Alternatively, when the foot pedal signal is a signal for shutting down the gradient power output of the laser, the selected operating voltage setting signal is an invalid signal, and the constant current output circuit 105 does not generate an operating current.

[0043] Furthermore, the constant current output circuit 105 is used to generate an operating current corresponding to the operating voltage setting signal it receives and provide the operating current to the laser 106 to achieve output of the corresponding gradient power.

[0044] After receiving the power enable signal from the control circuit 101, the switching power supply circuit 103 controls the power on and off of the laser 106 under the control of the power enable signal. Thus, under the control of the constant current output circuit 105 and the switching power supply circuit 103, the laser 106 generates a laser with a gradient power corresponding to the foot pedal signal output by the foot pedal circuit 104.

[0045] It should be noted that, in practical applications, the foot switch circuit 104 includes a foot switch and a configuration circuit of the foot switch.

[0046] In the laser drive control circuit provided by the embodiment of the present disclosure, only when the foot switch circuit 104 outputs a foot signal will the digital-to-analog conversion circuit 102 output a corresponding operating voltage setting signal to the constant current output circuit 105, thereby controlling the operating current and output gradient power of the laser 106. In the event of a failure of the control circuit 101, the constant current output circuit 105 can be controlled to stop output by the foot switch circuit 104, thereby improving the safety of the use of the laser 106. In addition, the laser drive control circuit provided by the present disclosure can cause the laser 106 to output lasers of different gradient powers by stepping on different pedals in the foot switch circuit 104. This enables safe and rapid switching of the laser gradient power. This reduces the control circuit resource consumption, improves the robustness of the system operation, and thus improves the safety of the treatment process.

[0047] To improve the reliability of the foot switch circuit itself, see Figure 1 As shown, in a specific embodiment of the present disclosure, the foot switch circuit 104 is also connected to the control circuit 101.

[0048] Specifically, in this embodiment, the control circuit 101 is further configured to send a foot enable signal to the foot switch circuit 104. The foot enable signal, also referred to as the FOOT_EN signal, is used to control the operating mode of the foot switch circuit 104. In other words, the control circuit 101 sends different foot enable signals to switch the foot switch circuit 104 between different operating modes. The operating modes of the foot switch circuit 104 include a normal use mode and a detection mode.

[0049] Upon receiving the foot enable signal from the control circuit 101, the foot switch circuit 104 switches to an operating mode corresponding to the foot enable signal. The foot switch circuit 104 is also configured to send a switch status signal to the control circuit. Thus, when the foot switch circuit 104 enters the detection mode, the control circuit 101 detects the foot switch circuit 104 based on the switch status signal.

[0050] In this specific embodiment, the control circuit 101 can realize the switching between the detection mode and the normal use mode of the foot switch circuit 104. When the foot switch circuit 104 enters the detection mode, it can be determined whether the foot switch circuit 104 has a fault based on the switch state signal of the foot switch circuit 104, thereby improving the reliability of the foot switch circuit 104. It should be noted that Figure 1 The foot switch circuit 104 is connected to the control circuit 101 , but the two may not be connected if the foot switch circuit fault detection is not considered.

[0051] Further, see Figure 2 As shown, in Figure 1 Based on the illustrated embodiment, the digital-to-analog conversion circuit 102 may include: a setting module, a selection module, and an output module.

[0052] Specifically, the setting module is connected to the control circuit 101 and is configured to receive multiple operating voltage setting signals sent by the control circuit 101. In some implementations, the setting module has an internal storage function for storing the multiple operating voltage setting signals sent by the control circuit 101. This allows the operating voltage setting signals to be saved after the digital-to-analog conversion circuit 102 is powered off, eliminating the need to retrieve them from the control circuit 101 the next time the circuit is used. It is understood that in other implementations, the setting module may not have an internal storage function, in which case the operating voltage setting signals must be retrieved from the control circuit 101 each time the circuit is powered on.

[0053] The selection module is connected to the foot switch circuit 104, the setting module, and the output module. The selection module receives a foot signal from the foot switch circuit 104. Upon receiving the foot signal, the selection module selects a corresponding operating voltage setting signal from the setting module based on the foot signal and outputs it to the output module. In actual use, the selection module is directly connected to each power output pin of the foot switch circuit 104 to receive the corresponding foot signal when the foot switch is pressed. When the foot signal corresponds to a certain gradient power laser, the corresponding operating voltage setting signal is selected from the setting module and output to the output module.

[0054] The output module is used to output the operating voltage setting signal selected by the selection module to the constant current output circuit 105. In practical applications, the output module can be an analog switch.

[0055] It should be noted that, in other implementations, the operating voltage setting signal output by the selection module may also be directly output to the constant current output circuit.

[0056] Furthermore, in some embodiments, the control circuit 101 is further configured to send a modulation signal to the digital-to-analog conversion circuit 102. The digital-to-analog conversion circuit 102 selects the presentation format of the operating voltage setting signal corresponding to the foot pedal signal based on the modulation signal. Specifically, the presentation format may include a pulse signal and a continuous signal. For example, when the gradient power corresponding to the laser is large, the operating mode corresponding to the continuous signal causes severe heating of the laser drive control circuit. In this case, a pulse signal may be used. On the other hand, when the gradient power corresponding to the laser is small, heat generation is reduced, and a continuous signal may be used for driving.

[0057] Here, a more detailed description is given when the digital-to-analog conversion circuit 102 includes an output module. In this case, the control circuit 101 is connected to the output module, and under the action of the modulation signal, controls the on-off mode of the analog switch in the output module, and outputs the selected operating voltage setting signal to the constant current output circuit 105 in a pulsed or continuous manner.

[0058] Furthermore, in one embodiment of the present disclosure, the foot switch circuit 104 may include a bus buffer, a NOT gate logic chip, a JK flip-flop, a state switch, and multiple power switches. The selection module may include a multiple-choose-one analog switch chip. Each power switch corresponds to a laser power level, and unused power switches correspond to different gradient powers. The number of power switches corresponds to the number of gradient powers that the laser can output.

[0059] The input of the bus buffer is connected to the state switch, the control of the bus buffer is connected to the output of the NOT gate logic chip, and the output of the bus buffer is connected to the control of the JK flip-flop. The input of the NOT gate logic chip is connected to the control circuit 101 for receiving a foot-operated enable signal from the control circuit 101. The first input, second input, and reset of the JK flip-flop are connected to the operating power supply, and the set of the JK flip-flop is connected to the control circuit for receiving a foot-operated enable signal from the control circuit 101. The control of the multiple-select analog switch chip is connected to the inverting output of the JK flip-flop, the multiple selection inputs of the multiple-select analog switch chip are connected one-to-one with the multiple power switches, the output of the multiple-select analog switch chip is connected to the output module, and the signal input of the multiple-select analog switch chip is connected to the setting module.

[0060] The status switch is also connected to the control circuit 101 , and multiple power switches are respectively connected to the control circuit 101 , so that the switch status signals of the status switch and the power switch are sent to the control circuit 101 , and the control circuit 101 can use the switch status signals to detect the foot switch circuit 104 .

[0061] For ease of understanding, the following example uses a foot switch including two power switches and one status switch. Figure 3 and Figure 4 S1 and S2 are power switches, S3 is a state switch, U4 is a bus buffer, U5 is a NOT gate logic chip, U3 is a JK flip-flop, and U6 is a four-to-one analog switch chip. In some implementations, U3 can be a JK flip-flop with RS function.

[0062] Figure 3 In the figure, VCC represents the operating power supply; R01, R02, and R03 are protection resistors that provide an initial voltage for S1, S2, and S3; C01, C02, and C03 are filter capacitors that provide filtering. U1A, U1B, and U1C are Schmitt shaping chips that shape the initial switch signals KEY1, KEY2, and KEY3 output by S1, S2, and S3, and output the corresponding pedal signals FOOT_H, FOOT_L, and FOOT_C.

[0063] Combine Figure 4, the signal FOOT_C generated by the status switch is transmitted to the input end of U4, the control end of U4 is connected to the output end of U5 for manually switching the working mode, and the output end of U4 is connected to the control end clk of U3. The input end of U5 is connected to the control circuit 101 for receiving the FOOT_EN signal sent by the control circuit 101. The first input end J, the second input end K and the reset end reset of U3 are connected to the working power supply VCC, and the set end set of U3 is connected to the control circuit for receiving the FOOT_EN signal sent by the control circuit 101. The control end EN of U6 is connected to the inverting output end of U3 The selection input terminal A0 of U6 is connected to S1 to receive the signal FOOT_H. The selection input terminal A1 of U6 is connected to S2 to receive the signal FOOT_L. The output terminal of U6 is connected to the output module to output the selected working voltage setting signal ADC_OT to the output module. The signal input terminals S1 and S2 of U6 are connected to the setting module to obtain the working voltage setting signals ADC_L and ADC_H of the setting module respectively.

[0064] Furthermore, the status switch S3 is connected to the control circuit 101, and the power switches S1 and S2 are connected to the control circuit 101, respectively. This allows the on / off status signal FOOT_CO from S3 and the on / off status signals FOOT_LO and FOOT_HO from S1 and S2 to be transmitted to the control circuit 101. The control circuit 101 can use these switch status signals to detect the foot switch circuit 104. Furthermore, the power pin VSS and ground pin GND of U6 are connected to ground, the power pin VDD of U6 is connected to the operating power supply VCC, and capacitor C04 is used for filtering. Diodes D1, D2, and D3 prevent the pedal signals FOOT_H, FOOT_L, and FOOT_C from interfering with the signals of the control circuit 101.

[0065] In actual use, FOOT_C is used to switch the laser working state, FOOT_H is used for high gradient power selection, and FOOT_L is used for low gradient power selection. The specific working principle is as follows:

[0066] The FOOT_EN signal is an output signal from control circuit 101. When it is low, the foot switch is in detection mode. U3 and U4 are disabled and unable to output the ADC_OT signal. Under normal conditions, the input signals FOOT_CO, FOOT_LO, and FOOT_HO to control circuit 101 should follow the changes in FOOT_C, FOOT_H, and FOOT_L. For example, when the FOOT_C, FOOT_H, and FOOT_L signals are low, the corresponding switch status signals FOOT_CO, FOOT_LO, and FOOT_HO in control circuit 101 should also be low. Therefore, a malfunction in foot switch circuit 104 can be determined based on the changes in the switch status signals from control circuit 101 when the corresponding switch is pressed.

[0067] Correspondingly, when the FOOT_EN signal is high, the foot switch circuit 104 enters the normal use mode, or the normal working mode. At this time, by changing the FOOT_C signal, that is, changing the reverse output terminal of U3 The FOOT_H or FOOT_L signal is used to select ADC_L or ADC_H as the operating voltage setting signal when U6 is enabled. Testing has shown that this circuit has fast response speed and high security.

[0068] It is scalable. In practical applications, the signals FOOT_C / FOOT_H / FOOT_L can also be equipped with anti-ESD circuits, filtering circuits and Schmitt circuits to improve the stability of the circuit and ensure that the input foot signals are correct.

[0069] Continue to see Figure 2 As shown, in a specific embodiment of the present disclosure, the laser driving control circuit may further include: a protection circuit 107. The protection circuit 107 is connected to the plug-in port of the digital-to-analog conversion circuit 102, the constant current output circuit 105 and the laser 106.

[0070] Specifically, the digital-to-analog conversion circuit 102 is further configured to send an operating voltage setting signal to be output to the constant current output circuit 105 to the protection circuit 107. The constant current output circuit 105 is further configured to send an actual operating voltage signal to the protection circuit 107. In this manner, the protection circuit 107 determines whether the laser 106 will experience an overcurrent based on the received operating voltage setting signal and the actual operating voltage signal. Determining whether the laser 106 will experience an overcurrent can be understood as a process of comparing the operating voltage setting signal and the actual operating voltage signal, with the determination of whether the laser 106 will experience an overcurrent based on the comparison result.

[0071] Furthermore, the protection circuit 107 is used to detect the port plug-in / out status of the laser 106 , and send a process signal to the digital-to-analog conversion circuit 102 when it is detected that the port plug-in / out status is normal and the laser 106 will not overcurrent.

[0072] The digital-to-analog conversion circuit 102 is used to select a corresponding operating voltage setting signal according to the foot pedal signal, and output the selected operating voltage setting signal to the constant current output circuit when receiving the process signal.

[0073] In this specific embodiment, the process signal serves to protect laser 106. Specifically, the process signal is only transmitted when conditions such as the laser 106 port plug-in status is normal and there is no overcurrent. Upon receiving the process signal, the digital-to-analog conversion circuit 102 outputs the selected operating voltage setting signal to the constant current output circuit 105, causing the constant current output circuit to output the corresponding operating current to the laser 106. Therefore, using this specific embodiment, laser 106 will only operate normally when conditions such as the laser 106 port plug-in status is normal and there is no overcurrent, thereby improving safety. It should be noted that, when failures such as the laser plug-in status are not considered, or when certain types of lasers 106 are not susceptible to similar failures, in other embodiments, the protection circuit may not be provided.

[0074] The following describes some specific forms of protection circuits. Figure 2 As shown, the protection circuit 107 may include a plug-in protection circuit and an overcurrent protection circuit. The plug-in protection circuit includes a temperature sensor plug-in protection circuit and an optical fiber plug-in protection circuit.

[0075] Specifically, a temperature sensor plug-in protection circuit is connected to the temperature sensor plug-in port and is used to detect the plug-in status of the temperature sensor plug-in port; and a fiber optic plug-in protection circuit is connected to the fiber optic plug-in port and is used to detect the plug-in status of the fiber optic plug-in port. Both the temperature sensor plug-in port and the fiber optic plug-in port are plug-in ports on the laser 106, and the plug-in status of the laser 106 can be detected through the temperature sensor plug-in port and the fiber optic plug-in port. The plug-in protection circuit requires the user to insert the optical fiber and temperature sensor into the designated ports. If they are inserted incorrectly or not inserted at all, the laser drive control circuit will not function properly.

[0076] The overcurrent protection circuit is connected to the digital-to-analog conversion circuit 102 and the constant current output circuit 105 respectively, and is used to receive the actual operating voltage signal sent by the constant current output circuit 105 and the operating voltage setting signal sent by the digital-to-analog conversion circuit, and determine whether the laser will overcurrent based on the operating voltage setting signal and the actual operating voltage signal it receives.

[0077] More specifically, see Figure 5 As shown, in a specific embodiment of the present disclosure, the optical fiber plug-in protection circuit includes: a photoelectric sensor, a first amplifier U7, a second comparator U8, an eighth resistor R23, a ninth resistor R24, a tenth resistor R20, an eleventh resistor R21, a twelfth resistor R22, a second capacitor C06, and a third capacitor C05. The eighth resistor R23 is a feedback resistor, the ninth resistor R24 ​​is a current-limiting resistor to prevent excessive current from entering U8, the tenth resistor R20 and the eleventh resistor R21 provide a set voltage for the negative input terminal of U8, and the set voltage can be modified by adjusting the resistance values ​​of R20 and R21. R22 provides an initial voltage for the output terminal of U8.

[0078] It should be noted that Figure 5 The photoelectric sensor includes a photodiode S4 and a current transformer i1. However, in actual use, other types of photoelectric sensors may also be used.

[0079] Specifically, the input end of the photoelectric sensor is used to receive the optical signal from the optical fiber plug-in port, and the output end of the photoelectric sensor is connected to the negative phase input end of the first amplifier U7. The positive phase input end of the first amplifier U7 is connected to the constant current output circuit 105 and is used to receive the actual operating voltage signal Vref sent by the constant current output circuit 105. An eighth resistor R23 is connected in series between the negative phase input end of the first amplifier U7 and the output end of the first amplifier U7.

[0080] The output of the first amplifier U7 is connected to the non-inverting input of the second comparator U8 via a ninth resistor R24. The negative input of the second comparator U8 is connected to the common terminal of the tenth resistor R20 and the eleventh resistor R21. The output of the second comparator U8 serves as the output of the optical fiber plug-in protection circuit. The tenth resistor R20 and the eleventh resistor R21 are connected in series between the operating power supply VCC and ground GND. The twelfth resistor R22 is provided between the output of the second comparator U8 and the operating power supply VCC. The second capacitor C06 is provided between the output of the second comparator U8 and ground GND. The third capacitor C05 is provided between the non-inverting input of the second comparator U8 and ground.

[0081] The fiber optic plug-in protection circuit works as follows: a photoelectric sensor, along with U7 and R23, forms a trans-impedance amplifier (TIA), converting the photoelectric detection signal into a voltage signal. The output voltage Det_v = Vref + i1 * R23. The output voltage Det_v is then compared with a set voltage via U8 to produce a high- or low-level signal Det_Safe. A high level for Det_Safe indicates a good fiber connection. This ensures that the output of laser 106 ensures the reliability of the fiber optic connection.

[0082] Further, see Figure 6 As shown, in a specific embodiment of the present disclosure, the temperature sensor plug protection circuit includes: a first resistor R25, a second resistor R26, a third resistor R27, a first switch tube Q4 and an input terminal RT1. It should be noted that, in Figure 6 In the circuit, since the temperature sensor plug protection circuit and the over-temperature protection circuit share the input terminal RT1, Figure 6 The input terminal in the circuit is a thermistor. However, the embodiment of the present disclosure is not limited thereto. In other embodiments of the present disclosure, input terminals may be provided for the temperature sensor plug protection circuit and the over-temperature protection circuit, respectively.

[0083] Specifically, the emitter of the first switching transistor Q4, the first resistor R25, the second resistor R26, and the base of the first switching transistor Q4 are connected in sequence, and the connecting end of the first resistor R25 and the second resistor R26 is connected to the input terminal, which is also connected to the temperature sensor plug-in port. The third resistor R27 is provided between the collector of the first switching transistor Q4 and ground, and the connection end between the third resistor R27 and the collector of the first switching transistor Q4 serves as the output terminal VP of the temperature sensor plug-in protection circuit.

[0084] Continue to see Figure 2 and Figure 6 As shown, in a specific embodiment of the present disclosure, the protection circuit 107 may further include: an over-temperature protection circuit.

[0085] Specifically, the over-temperature protection circuit includes a first follower U9, a first comparator U10, a fourth resistor R28, a fifth resistor R30, a sixth resistor R31, a seventh resistor R29 and a first capacitor C5.

[0086] The positive phase input terminal of the first follower U9 is connected to the connection terminal of the first resistor R25 and the second resistor R26, and the negative phase input terminal of the first follower U9 is connected to the output terminal of the first follower U9. The output terminal of the first follower U9 is connected to the positive phase input terminal of the first comparator U10 via the fourth resistor R28. The negative phase input terminal of the first comparator U10 is connected to the common terminal of the fifth resistor R30 and the sixth resistor R31. The output terminal of the first comparator U10 serves as the output terminal of the overtemperature protection circuit. The fifth resistor R30 and the sixth resistor R31 are connected in series between the operating power supply and ground.

[0087] The seventh resistor R29 is disposed between the output terminal of the first comparator U10 and the working power supply VCC, and the first capacitor C5 is disposed between the output terminal of the first comparator U10 and the ground GND.

[0088] Figure 6The working principle is as follows: when RT1 is not connected to the laser, the VP output is low. When the laser is connected, Q4 is turned on and the VP output signal is high. By judging the level of the VP level, the connection of the laser is guaranteed. In addition, by configuring the resistance values ​​of R25 and R26, the voltage of the positive input terminal of U9 can be modified. By configuring the resistance values ​​of R31 and R30, the protection voltage can be set, and the high and low levels are output by comparing with the actual input voltage. When the temperature inside the laser is different, the resistance of the thermistor RT1 is different. According to the voltage divider principle, the voltage at the positive input terminal of U9 changes. This signal is input to the "+" pole (that is, the positive input terminal) of U10 through the U9 follower, and is compared with the protection voltage at the negative input terminal of U10 to output the high and low level signal TempSafe. Among them, when TempSafe is high, it ensures that overheating will not occur. The protection voltage of the negative phase input terminal of U10 is determined according to the temperature tolerance of the laser. In other words, the protection voltage of the negative phase input terminal of U10 corresponds to the operating temperature setting value of the laser. The operating temperature setting value can be understood as the temperature threshold at which the laser can operate safely.

[0089] It should be noted here that, if there is no over-temperature problem, in other embodiments of the present disclosure, the over-temperature protection circuit may not be included.

[0090] Furthermore, in a specific embodiment of the present disclosure, the overcurrent protection circuit may include a thirteenth resistor R8, a fourteenth resistor R11, a fifteenth resistor R12, a sixteenth resistor R16, a seventeenth resistor R18, a second amplifier U12 and a third comparator U6B.

[0091] Specifically, one end of the thirteenth resistor R8 is connected to the output end of the digital-to-analog conversion circuit, and the other end of the thirteenth resistor R8 is connected to the non-inverting input end of the second amplifier U12. When the digital-to-analog conversion circuit includes an output module, the thirteenth resistor is connected to the output module.

[0092] The negative phase input terminal of the second amplifier U12 is grounded via the fourteenth resistor R11. A fifteenth resistor R12 is provided between the negative phase input terminal of the second amplifier U12 and the output terminal of the second amplifier U12. A sixteenth resistor R16 is provided between the output terminal of the second amplifier U12 and the positive phase input terminal of the third comparator U6B.

[0093] A non-inverting input terminal of the third comparator U6B is connected to the constant current output circuit via the seventeenth resistor R18 to receive an actual operating voltage signal of the constant current output circuit.

[0094] The output terminal of the third comparator U6B serves as the output terminal of the overcurrent protection circuit.

[0095] exist Figure 7The output module includes an analog switch chip U11. Its normally open pin NO receives the operating voltage setting signal ADC_OT output by the selection module. Its normally closed pin NC is connected to GND. The common pin COM is used for output, and the input pin IN is connected to the control circuit 101. Specifically, the control circuit 101 sends a modulation signal Laser_PWM to the control circuit 101 output. The signal Laser_PWM can be either a pulse signal or a continuous signal. Under the influence of the modulation signal Laser_PWM, the output module delays and modulates the ADC_OT signal to generate the signal Laser_ADC, which is then output to the constant current output circuit.

[0096] exist Figure 7 The constant current output circuit includes a fourth amplifier U3B, a fifth amplifier U5B, a MOS tube Q3, a fast diode D6, an eighteenth resistor R4, a nineteenth resistor R13, a twentieth resistor R9, a twenty-first resistor R5, a twenty-second resistor R10, a twenty-third resistor R15, a twenty-fourth resistor R14, a twenty-fifth resistor R17, a twenty-sixth resistor R19 and a sampling resistor RS1. The connection relationship of each component is shown in FIG. Figure 7 Detailed description is omitted here. Sampling resistor RS1 is used to sample the actual operating voltage. The presence of fast diode D6 improves the dynamic characteristics of U3B. U5B matches the impedance between the drain and gate of MOS tube Q3, enabling a slow start-up of Q3. Slow start-up reduces overshoot, mitigating overshoot generated when Q3 operates in pulsed mode, thereby protecting the laser and extending its lifespan. The fast bleeder formed by D6 and R9 enables a fast shutdown of Q3, further enhancing laser safety.

[0097] U12 performs a protection amplification on the set voltage (also known as the operating voltage setting signal ADC_OT). The amplification factor can be modified using resistors R11 and R12. The amplified signal then serves as the input signal to the positive input terminal of U6B. The voltage across the sampling resistor RS1 is amplified by the U5B op amp and output as the input signal to the negative input terminal of U6B. The output level Current_Safe is determined by comparing the amplified actual operating voltage with the amplified set voltage.

[0098] Figure 7The circuit operates as follows: I represents the actual operating current. The actual operating voltage at the top of sampling resistor RS1 is (I*RS1). This actual operating voltage is divided by R14 and R15 and serves as the input signal to the positive input of U5B. R17 and R19 are used to configure the amplification factor. The overall amplification factor of U5B is (1+R19 / R17), meaning the output signal from U5B is (I*RS1)*(R14 / R15)*(1+R19 / R17). This output signal is input to the negative input of U6B via R18. The positive terminal of U6B is (1+R12 / R11) times the input operating voltage setting signal (ADC_OT), meaning (1+R2 / R11) is the protection factor. When ADC_OT*(1+R12 / R11) is greater than (I*RS1)*(R14 / R15)*(1+R19 / R17), U6B outputs a high level, indicating that the circuit does not exceed the protection range; otherwise, U6B outputs a low level, indicating that the circuit exceeds the protection range.

[0099] It should be noted that Figure 7 Resistor R2, capacitor C2, diode D7, and light-emitting diode LD together form the laser. R2 and C2 form a resistance-capacitance absorption circuit, and D7 ensures the laser's reverse current discharge to prevent the laser from being broken down by reverse voltage.

[0100] See also Figure 2 As shown, in a specific embodiment of the present disclosure, the laser driving control circuit may further include: a power delay circuit 108 and an electrostatic protection circuit 109 .

[0101] Specifically, the power delay circuit 108 is connected to the control circuit 101 and the switching power supply circuit 103, respectively, and is used to receive the power enable signal sent by the control circuit 101 and send the power enable signal to the switching power supply circuit 103 after delay. The electrostatic protection circuit 109 is connected to the control circuit 101 and the laser 106, respectively, and is used to short-circuit the anode and cathode of the laser 106 when the power enable signal is not received, and disconnect the anode and cathode of the laser 106 when the power enable signal is received.

[0102] Further, Figure 7 A schematic diagram of an electrostatic protection circuit is shown in FIG. Figure 7 To explain in detail: Figure 7The electrostatic protection circuit shown includes: a normally closed relay Q1, a freewheeling diode D8, a switch tube Q2, a resistor R3, a resistor R6, and a resistor R7. When the laser is not in operation, the electrostatic protection circuit connects the cathode and anode of the laser to eliminate a potential difference, thereby achieving the protection purpose. Accordingly, when the control circuit sends the power enable signal PowerEn, the PowerEn signal passes through the isolation resistor R3, is driven by the switch circuit composed of the switch tube Q2, the resistor R6, and the resistor R7, and is output to the normally closed relay Q1. The electromagnetic effect causes Q1 to open, and the laser operates normally. It should be noted that in actual use, the output signal PowerEn of the control circuit 101 may contain abnormal signals, which can be filtered out by Schmidt shaping.

[0103] ESD (Electro-Static discharge) is a common cause of laser failure. If there is no electrostatic protection circuit during the optical fiber access or removal process, the laser may suffer a shortened service life or irreversible damage due to static electricity. The disclosed embodiment adds an electrostatic protection circuit and connects the laser cathode and anode when the laser is not working, so that there is no potential difference, thereby achieving the protection purpose.

[0104] In addition, the presence of the power delay circuit ensures that after the laser parameter configuration is completed, the DelayEn signal, a delayed version of the PowerEn signal, is output to the switching power supply circuit to initiate power supply. This ensures that power is first disconnected when the laser is shut down, thereby ensuring the normal operation of the laser. In actual use, the power delay circuit can be a timer chip. The delayed output generated by the power delay circuit not only ensures that the laser complies with the specified regulatory requirements in medical applications, but also ensures its operational safety. Specifically, the power supply is powered on after all parameter configurations are completed. For example, the power delay circuit ensures that the electrostatic protection circuit has sufficient time to disconnect, thus preventing overcurrent caused by failure to disconnect. Timer chips, such as the NE555, can be configured through external peripherals to output signal period and pulse width.

[0105] Continue to see Figure 2 As shown, in a specific embodiment of the present disclosure, the laser driving control circuit may further include: an enabling power supply circuit 110 .

[0106] The enable power supply circuit 110 is respectively connected to the control circuit 101, the foot switch circuit 104 and the switching power supply circuit 103. The enable power supply circuit 110 is configured to send a power enable signal to the switching power supply circuit 103 upon receiving a foot signal sent by the foot switch circuit 104 and a power enable signal sent by the control circuit 101.

[0107] The specific embodiment of the present disclosure is provided with an enable power supply circuit 110, so that the power enable signal will be transmitted only when the foot pedal signal and the power enable signal are received simultaneously, further ensuring the safety of the laser operation. In actual use, the enable power supply circuit 110 can be an AND gate circuit.

[0108] It will be appreciated that in other embodiments, the foot switch circuit 104 may be connected to the control circuit 101. Furthermore, the foot switch circuit 104 is configured to send a switch status signal to the control circuit 101. When the switch status signal indicates that the foot switch circuit is in an operating state, the control circuit 101 sends a power enable signal to the power supply circuit to enhance laser operation safety. In other words, the control circuit 101 is configured to send a power enable signal to the switching power supply circuit when the foot switch circuit 104 enters normal operation mode and the switch status signal indicates that the foot switch circuit is in an operating state.

[0109] In actual use, when selecting the output gradient power of the laser, it is sometimes possible to accidentally step on the power switch, that is, step on multiple power switches at the same time, which is bound to cause serious safety problems. To this end, in a specific embodiment of the present disclosure, the foot switch circuit 104 includes: an exclusive OR logic circuit (i.e., a second exclusive OR logic circuit). The output end of each power switch in the foot switch circuit is connected to the input end of the exclusive OR logic circuit, and the output end of the exclusive OR logic circuit is connected to the control circuit. In this way, when multiple power switches are simultaneously turned on, the switch state signal output by the exclusive OR logic circuit indicates that the foot switch circuit is in a non-working state, and the control circuit does not issue a power enable signal, thereby ensuring the safety of the laser.

[0110] See here Figure 3 For a more intuitive explanation, for example, when the user steps on S1 and S2 at the same time, FOOT_L and FOOT_H signals are generated at the same time. At this time, due to the use of the XOR logic circuit U2, the output switch state signal FOOT_S is an invalid signal, and the power enable signal cannot be generated or transmitted to the switching power supply circuit 103. Figure 3 Pins A and B are the input terminals of U2, pin Y is the output terminal of U2, VCC is the working power supply, and C19 is the filter capacitor.

[0111] It can be understood that when the laser drive control circuit includes an enable power supply circuit 110, the XOR logic circuit (i.e., the first XOR logic circuit) can be connected to the enable power supply circuit 110. At this time, when multiple power switches are stepped on at the same time, the XOR logic circuit sends an invalid signal to the enable power supply circuit 110, which can also ensure the safety of the laser. It can also prevent the erroneous operation of stepping on two power switches at the same time, thereby increasing the robustness of the laser drive control circuit.

[0112] Furthermore, in one embodiment of the present disclosure, the protection circuit 107 is also connected to the control circuit 101. In this case, the protection circuit 107 is used to detect the port plug-in status of the laser 106 and the status of the control circuit 101. When the port plug-in status is normal, the laser 106 is not overcurrent-prone, and the control circuit 101 is in normal operation, the protection circuit 107 sends a process signal to the digital-to-analog conversion circuit 102. In this embodiment, no process signal is generated when the controller is abnormal, further improving the safety of the laser.

[0113] It should be noted that when the protection circuit includes multiple circuits such as overcurrent protection and plug-in protection, an AND gate can be used to merge the various signals into one process signal.

[0114] For ease of understanding, here we combine Figure 8 Provide explanation. Figure 8 In this example, the control circuit is an MCU, and the protection circuit also includes a temperature sensor plug-in protection circuit, a fiber optic plug-in protection circuit, an overcurrent protection circuit, and an overtemperature protection circuit. The MCU's protection output and the output of the overtemperature protection circuit are connected to the input of AND gate U1B. The output of U1B and the output of the fiber optic plug-in protection circuit are connected to the input of AND gate U1C. The output of U1C and the output of the overcurrent protection circuit are connected to the input of AND gate U1D. The output of U1D and the output of the temperature sensor plug-in protection circuit are connected to the input of AND gate U1A. The output of U1A serves as the output of the process signal ProS. It can be seen that the ProS signal is only output when the high-level and low-level signals VP output by the temperature sensor plug-in protection circuit are high, the high-level and low-level signals TempSafe output by the overtemperature protection circuit are high, the high-level and low-level signals Current_Safe output by the overcurrent protection circuit are high, the high-level and low-level signals Det_Safe output by the fiber optic plug-in protection circuit are high, and the high-level and low-level signals MCUSafe output by the MCU are high. Then the digital-to-analog conversion circuit 102 will output the operating voltage setting signal to the constant current output circuit 105 , thereby improving the safety of the laser.

[0115] Although a plurality of embodiments of the present disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many modifications, changes, and alternatives without departing from the ideas and spirit of the present disclosure. It should be understood that in practicing the present disclosure, various alternatives to the embodiments of the present disclosure described herein may be adopted. The appended claims are intended to define the scope of protection of the present disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A laser driving control circuit, characterized in that: Used to perform gradient power drive control on the laser, including: control circuit, digital-to-analog conversion circuit, switching power supply circuit, foot switch circuit and constant current output circuit; The control circuit is connected to the digital-to-analog conversion circuit and the switching power supply circuit respectively, and is used to send a plurality of operating voltage setting signals to the digital-to-analog conversion circuit and send a power enable signal to the switching power supply circuit; The foot switch circuit is connected to the digital-to-analog conversion circuit and is used to send a foot signal to the digital-to-analog conversion circuit, and the foot signal is used to turn on or off the gradient power output of the laser; The digital-to-analog conversion circuit is also connected to the constant current output circuit, and is used to receive multiple operating voltage setting signals; and is used to select a corresponding operating voltage setting signal according to the foot pedal signal when receiving the foot pedal signal and output it to the constant current output circuit, where different operating voltage setting signals correspond to different gradient powers of the laser; The constant current output circuit is connected to the laser and is also used to generate an operating current corresponding to the operating voltage setting signal and provide it to the laser to achieve the output of the corresponding gradient power; the switching power supply circuit is also connected to the laser and controls the power on and off of the laser under the control of the power enable signal; The foot switch circuit is also connected to the control circuit; The control circuit is further configured to send a foot-operated enable signal to the foot-operated switch circuit, wherein the foot-operated enable signal is configured to control an operating mode of the foot-operated switch circuit, wherein the operating mode includes a normal use mode and a detection mode; The foot switch circuit is further configured to switch to a working mode corresponding to the foot enable signal upon receiving the foot enable signal, and to send a switch state signal to the control circuit.

2. The laser driving control circuit according to claim 1, characterized in that: The control circuit is further configured to detect the foot switch circuit according to the switch state signal when the foot switch circuit enters a detection mode.

3. The laser driving control circuit according to claim 2, characterized in that: The digital-to-analog conversion circuit includes: a setting module, a selection module and an output module; The setting module is connected to the control circuit and is used to receive a plurality of operating voltage setting signals sent by the control circuit; The selection module is connected to the foot switch circuit, the setting module and the output module respectively, and is used to select the corresponding working voltage setting signal from the setting module according to the foot signal when receiving the foot signal and output it to the output module; The output module is used to output the operating voltage setting signal selected by the selection module to the constant current output circuit.

4. The laser driving control circuit according to claim 3, characterized in that: The foot switch circuit includes: a bus buffer, a NOT gate logic chip, a JK trigger, a state switch and multiple power switches; the selection module includes: a multiple-select-one analog switch chip; The input end of the bus buffer is connected to the state switch, the control end of the bus buffer is connected to the output end of the NOT gate logic chip, and the output end of the bus buffer is connected to the control end of the JK trigger; The input end of the NOT gate logic chip is connected to the control circuit and is used to receive the pedal enable signal sent by the control circuit; The first input terminal, the second input terminal and the reset terminal of the JK trigger are connected to the working power supply, and the set terminal of the JK trigger is connected to the control circuit for receiving the pedal enable signal sent by the control circuit; The control end of the multiple-select-one analog switch chip is connected to the inverting output end of the JK trigger, the multiple selection input ends of the multiple-select-one analog switch chip are connected one-to-one with the multiple power switches, the output end of the multiple-select-one analog switch chip is connected to the output module, and the signal input end of the multiple-select-one analog switch chip is connected to the setting module; The state switch is also connected to the control circuit, and a plurality of power switches are respectively connected to the control circuit.

5. The laser driving control circuit according to claim 3, characterized in that: The setting module has an internal storage function for storing a plurality of operating voltage setting signals sent by the control circuit.

6. The laser driving control circuit according to claim 1, characterized in that: Also includes: Protection circuit; The protection circuit is connected to the digital-to-analog conversion circuit, the constant current output circuit and the plug-in port of the laser; The digital-to-analog conversion circuit is further configured to send, to the protection circuit, a working voltage setting signal that it intends to output to the constant current output circuit; The constant current output circuit is further configured to send an actual operating voltage signal to the protection circuit; the protection circuit is configured to detect the port plug-in / out status of the laser, and determine whether the laser will overcurrent based on the received operating voltage setting signal and the actual operating voltage signal, and send a process signal to the digital-to-analog conversion circuit when the port plug-in / out status is normal and the laser will not overcurrent; The digital-to-analog conversion circuit is used to select a corresponding operating voltage setting signal according to the foot pedal signal, and output the selected operating voltage setting signal to the constant current output circuit when receiving the process signal.

7. The laser driving control circuit according to claim 6, characterized in that: The protection circuit includes: a temperature sensor plug-in protection circuit, an optical fiber plug-in protection circuit and an overcurrent protection circuit; The temperature sensor plug protection circuit is connected to the temperature sensor plug port and is used to detect the plug status of the temperature sensor plug port; The optical fiber plug-in protection circuit is connected to the optical fiber plug-in port and is used to detect the plug-in status of the optical fiber plug-in port; The overcurrent protection circuit is respectively connected to the digital-to-analog conversion circuit and the constant current output circuit, and is used to receive the actual operating voltage signal and the operating voltage setting signal sent by the digital-to-analog conversion circuit, and determine whether the laser will overcurrent based on the received operating voltage setting signal and the actual operating voltage signal.

8. The laser driving control circuit according to claim 7, characterized in that: The temperature sensor plug protection circuit includes: a first resistor, a second resistor, a third resistor, a first switch tube and an input terminal; The emitter of the first switching tube, the first resistor, the second resistor and the base of the first switching tube are connected in sequence, and the connecting end of the first resistor and the second resistor is connected to the input terminal; The input terminal is also connected to the temperature sensor plug-in port; The third resistor is arranged between the collector of the first switching tube and the ground, and the connection end between the third resistor and the collector of the first switching tube serves as the output end of the plug protection circuit.

9. The laser driving control circuit according to claim 8, characterized in that: The input terminal is a thermistor; and further comprising: an over-temperature protection circuit; The over-temperature protection circuit includes a first follower, a first comparator, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a first capacitor; The positive phase input terminal of the first follower is connected to the connection terminal of the first resistor and the second resistor, and the negative phase input terminal of the first follower is connected to the output terminal of the first follower; The output end of the first follower is connected to the positive phase input end of the first comparator via the fourth resistor, the negative phase input end of the first comparator is connected to the common end of the fifth resistor and the sixth resistor, and the output end of the first comparator serves as the output end of the over-temperature protection circuit; The fifth resistor and the sixth resistor are connected in series between the working power supply and the ground; The seventh resistor is arranged between the output terminal of the first comparator and the working power supply; The first capacitor is arranged between the output terminal of the first comparator and the ground.

10. The laser driving control circuit according to claim 7, characterized in that: The optical fiber plugging protection circuit includes: a photoelectric sensor, a first amplifier, a second comparator, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor and a third capacitor; The input end of the photoelectric sensor is used to receive the optical signal of the optical fiber plug-in port, and the output end of the photoelectric sensor is connected to the negative phase input end of the first amplifier; the positive phase input end of the first amplifier is connected to the constant current output circuit, and is used to receive the actual working voltage signal sent by the constant current output circuit, and the eighth resistor is connected in series between the negative phase input end of the first amplifier and the output end of the first amplifier; The output end of the first amplifier is connected to the positive phase input end of the second comparator via the ninth resistor, the negative phase input end of the second comparator is connected to the common end of the tenth resistor and the eleventh resistor, and the output end of the second comparator serves as the output end of the optical fiber plugging protection circuit; The tenth resistor and the eleventh resistor are connected in series between the working power supply and the ground; The twelfth resistor is arranged between the output terminal of the second comparator and the working power supply; The second capacitor is arranged between the output terminal of the second comparator and the ground; The third capacitor is arranged between the non-inverting input terminal of the second comparator and the ground.

11. The laser driving control circuit according to claim 8, characterized in that: The overcurrent protection circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a second amplifier and a third comparator; One end of the thirteenth resistor is connected to the output end of the digital-to-analog conversion circuit, and the other end of the thirteenth resistor is connected to the non-inverting input end of the second amplifier; The negative phase input terminal of the second amplifier is grounded via the fourteenth resistor, the fifteenth resistor is provided between the negative phase input terminal of the second amplifier and the output terminal of the second amplifier, and the sixteenth resistor is provided between the output terminal of the second amplifier and the positive phase input terminal of the third comparator; The non-inverting input terminal of the third comparator is connected to the constant current output circuit via the seventeenth resistor to receive the actual working voltage signal of the constant current output circuit; The output end of the third comparator serves as the output end of the overcurrent protection circuit.

12. The laser driving control circuit according to any one of claims 1 to 11, characterized in that: Also includes: Power delay circuit and electrostatic protection circuit; The power delay circuit is connected to the control circuit and the switching power circuit respectively, and is used to receive the power enable signal sent by the control circuit, and send the power enable signal to the switching power circuit after delaying; The electrostatic protection circuit is connected to the control circuit and the laser respectively, and is used to short-circuit the anode and cathode of the laser when the power enable signal is not received, and disconnect the anode and cathode of the laser when the power enable signal is received.

13. The laser driving control circuit according to any one of claims 1 to 11, characterized in that: Also includes: Enable the power supply circuit; The enable power supply circuit is respectively connected to the control circuit, the foot switch circuit and the switching power supply circuit, and is used to send the power enable signal to the switching power supply circuit when receiving the foot signal sent by the foot switch circuit and the power enable signal sent by the control circuit.

14. The laser driving control circuit according to claim 13, characterized in that: The foot switch circuit includes: a first XOR logic circuit; The output end of each power switch of the foot switch circuit is connected to the input end of the first XOR logic circuit, and the output end of the first XOR logic circuit is connected to the enable power supply circuit.

15. The laser driving control circuit according to any one of claims 1 to 11, characterized in that: The control circuit is further configured to send a modulation signal to the digital-to-analog conversion circuit; The digital-to-analog conversion circuit is used to select a presentation form of the working voltage setting signal corresponding to the pedal signal according to the modulation signal, and the presentation form includes: a pulse signal and a continuous signal.

16. The laser driving control circuit according to any one of claims 1 to 11, characterized in that: The foot switch circuit is also used to send a switch state signal to the control circuit; The control circuit is further configured to send a power enable signal to the power circuit when the switch state signal indicates that the foot switch circuit is in a working state.

17. The laser driving control circuit according to any one of claims 1 to 11, characterized in that: The foot switch circuit includes: a second XOR logic circuit; The output end of each power switch of the foot switch circuit is connected to the input end of the second XOR logic circuit, and the output end of the second XOR logic circuit is connected to the control circuit.

18. The laser driving control circuit according to any one of claims 7 to 11, characterized in that: The protection circuit is also connected to the control circuit; The protection circuit is used to detect the port plug-in status of the laser and the status of the control circuit, and sends a process signal to the digital-to-analog conversion circuit when the port plug-in status is normal, the laser does not overcurrent, and the control circuit is in a normal state.

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