Power control device, laser apparatus, and power control method

Abstract

The invention relates to a power control device, laser equipment and a power control method. The device comprises a control circuit, a power sampling circuit, a temperature sampling circuit, a power driving circuit, a temperature driving circuit and a laser transmitter, wherein the power sampling circuit is used for collecting the output power of the laser transmitter and transmitting the output power to the control circuit; the control circuit is used for adjusting the output current value of the power driving circuit according to the output power and the first target power, and controlling the working mode of the temperature driving circuit according to the output power and the second target power; the first target power is not greater than the second target power; the temperature sampling circuit is used for collecting the temperature value of the laser transmitter; and the control circuit is also used for adjusting the temperature of the laser transmitter through the temperature driving circuit according to the temperature value and the target temperature value under the condition that the working mode of the temperature driving circuit is the operation mode. By adopting the method, the output power of the laser transmitter can be adjusted.

Description

Technical Field

[0001] This application relates to the field of laser control technology, and in particular to a power control device, laser equipment, and power control method. Background Technology

[0002] Lasers are widely used in various fields due to their excellent directionality, high brightness, good monochromaticity, and good coherence. Ensuring the stability of the laser emitter's output power during operation is crucial, as it directly affects the precision and reliability of laser processing, communication, medical, and other applications.

[0003] Because the output power of a laser emitter is very sensitive to temperature, the stability of the output power will be affected by the increase in temperature when the laser emitter is working for a long time.

[0004] However, traditional technologies lack a control method for real-time adjustment of the output power of laser emitters. Summary of the Invention

[0005] Therefore, it is necessary to provide a power control device, laser equipment, and power control method that can control the output power of a laser emitter to address the aforementioned technical problems.

[0006] In a first aspect, this application provides a power control device, which includes a control circuit, a power sampling circuit, a temperature sampling circuit, a power drive circuit, a temperature drive circuit, and a laser emitter;

[0007] The power sampling circuit is used to collect the output power of the laser emitter and transmit the output power to the control circuit.

[0008] The control circuit is used to adjust the output current value of the power drive circuit according to the output power and the first target power, and to control the working mode of the temperature drive circuit according to the output power and the second target power; the first target power is not greater than the second target power.

[0009] Temperature sampling circuit, used to collect the temperature value of the laser emitter;

[0010] The control circuit is also used to adjust the temperature of the laser emitter according to the temperature value and the target temperature value when the temperature drive circuit is in the operating mode.

[0011] In one embodiment, the control circuit is configured to output a first control signal to the power drive circuit when the output power is greater than a first target power; the first control signal is configured to instruct the power drive circuit to reduce the output current value; or...

[0012] If the output power is less than the first target power, a second control signal is output to the power drive circuit; the second control signal is used to instruct the power drive circuit to increase the output current value.

[0013] In one embodiment, the control circuit is used to control the temperature drive circuit to switch to an operating mode when the output power is greater than the second target power.

[0014] In one embodiment, the laser emitter includes a cooling chip and a heating film, and the temperature driving circuit includes a cooling driving circuit and a heating driving circuit. The cooling driving circuit is connected to the cooling chip, and the heating driving circuit is connected to the heating film.

[0015] In one embodiment, the control circuit is configured to output a third control signal to the cooling drive circuit when the temperature value is greater than the target temperature value; the third control signal is used to drive the cooling element to cool; or...

[0016] If the temperature value is lower than the target temperature value, a fourth control signal is output to the heating drive circuit. The fourth control signal is used to drive the heating film to generate heat.

[0017] In one embodiment, the power sampling circuit includes a voltage amplification circuit; the voltage amplification circuit is used to acquire the current signal of the photodiode of the laser emitter and determine the output power based on the current signal.

[0018] In one embodiment, the power sampling circuit includes a cross-group amplifier circuit; the cross-group amplifier circuit is used to acquire the current signal on the photodiode of the laser emitter and determine the output power based on the current signal.

[0019] In one embodiment, the power sampling circuit further includes a reverse bias circuit, which is connected to the positive and negative terminals of the photodiode, respectively.

[0020] A reverse bias circuit is used to provide a reverse bias voltage to a photodiode.

[0021] Secondly, this application also provides a laser device, including a power control device as described in any of the first aspects above.

[0022] Thirdly, this application also provides a power control method, which is applied to a power control device as described in any of the first aspects above, the method comprising:

[0023] Obtain the output power and temperature values ​​of the laser emitter;

[0024] The output current value of the power drive circuit is adjusted according to the output power and the first target power, and the operating mode of the temperature drive circuit is controlled according to the output power and the second target power; the first target power is not greater than the second target power.

[0025] When the temperature driving circuit is in the operating mode, the temperature of the laser emitter is adjusted according to the temperature value and the target temperature value.

[0026] The aforementioned power control device, laser equipment, and power control method include a power control device comprising a control circuit, a power sampling circuit, a temperature sampling circuit, a power drive circuit, a temperature drive circuit, and a laser emitter. The power sampling circuit collects the output power of the laser emitter and transmits it to the control circuit. The control circuit adjusts the output current of the power drive circuit based on the output power and a first target power, and controls the operating mode of the temperature drive circuit based on the output power and a second target power; the first target power is not greater than the second target power. The temperature sampling circuit collects the temperature value of the laser emitter. The control circuit, when the temperature drive circuit is in operating mode, adjusts the temperature of the laser emitter through the temperature drive circuit based on the temperature value and the target temperature value. Thus, the power control device can adjust the output current value output to the laser emitter by acquiring the output power of the laser emitter, thereby adjusting the output power of the laser emitter.

[0027] Furthermore, the output control can also control the operating mode of the temperature drive circuit, thereby adjusting the temperature of the laser emitter when the temperature drive circuit is running. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the power control device in one embodiment;

[0030] Figure 2 This is a schematic diagram of the power control device in another embodiment;

[0031] Figure 3 This is a schematic diagram of the power control device in another embodiment;

[0032] Figure 4 This is a schematic diagram of the voltage amplifier circuit of the power sampling circuit in one embodiment;

[0033] Figure 5 This is a schematic diagram of the cross-group amplifier circuit of the power sampling circuit in one embodiment;

[0034] Figure 6 This is a schematic diagram showing the connection between the photodiode and the laser diode in one embodiment;

[0035] Figure 7 This is a schematic diagram showing the connection between the photodiode and the laser diode in another embodiment;

[0036] Figure 8 This is a schematic diagram showing the connection between the photodiode and the laser diode in another embodiment;

[0037] Figure 9 This is a flowchart illustrating a power control method in one embodiment. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0045] Currently, lasers can be classified into semiconductor lasers and solid-state lasers based on their gain media. Semiconductor lasers use semiconductor materials as the gain medium and emit light through a PN junction structure. As temperature increases, the bandgap of the semiconductor material decreases, the emission wavelength shifts, and the efficiency of the active region generating photons decreases, leading to a drop in output power. Solid-state lasers use solid materials doped with active ions as the gain medium and require an external pump source (such as a semiconductor laser or flash lamp) to provide energy to excite the active ions from their ground state to a higher energy level. Stimulated emission then forms laser oscillations within the resonant cavity, ultimately outputting laser light. Because the pump source, gain medium, and resonant cavity are temperature-sensitive, the output power of solid-state lasers decreases with increasing temperature.

[0046] As can be seen from the above, the output power of a laser emitter is very sensitive to temperature. Therefore, when a laser emitter operates for a long time, the increase in temperature will affect the stability of the output power.

[0047] In view of this, this application provides a power control device that can adjust the output current value output to the laser emitter by acquiring the output power of the laser emitter, thereby adjusting the output power of the laser emitter. Furthermore, the output control can also control the operating mode of the temperature drive circuit, thereby regulating the temperature of the laser emitter when the temperature drive circuit is operating.

[0048] like Figure 1 As shown, the power control device 100 of this application embodiment includes a control circuit 10, a power sampling circuit 20, a temperature sampling circuit 30, a power drive circuit 40, a temperature drive circuit 50, and a laser emitter 60.

[0049] The control circuit 10 can be an MCU (Microcontroller Unit). MCUs are characterized by low power consumption, low cost, and strong control capabilities, and are widely used in various fields. The control circuit 10 outputs a current signal through the power drive circuit 40, and controls the laser emitter 60 to operate through the current signal.

[0050] The power sampling circuit 20 is used to collect the output power of the laser emitter 60 and transmit the output power to the control circuit 10. The control circuit 10 is used to adjust the output current value of the power drive circuit 40 according to the output power and the first target power, and to control the working mode of the temperature drive circuit 50 according to the output power and the second target power; the first target power is not greater than the second target power.

[0051] When the laser emitter 60 is operating, in order to ensure that the laser emitter 60 can output stable output power, the power sampling circuit 10 collects the output power of the laser emitter 60. Optionally, the power sampling circuit 10 can sample the output power of the laser through a voltage amplification circuit or through a cross-group amplification circuit. Then, the collected output signal of the laser emitter 60 is converted and output to the control circuit 10.

[0052] The first target power is the expected value of the power that the laser emitter 60 can stably output. Optionally, the first target power can be a target power value or a range of target power. The control circuit 10 compares the received current output power of the laser emitter 60 with the first target power to determine whether the current output power is the first target power or within the range of the first target power. Based on the comparison result, the output circuit value of the power drive circuit 40 is adjusted to adjust the output power of the laser emitter 60.

[0053] In this embodiment, the power control device 100 can operate in a single-power closed-loop control mode and a dual-power and temperature closed-loop control mode. In the single-power closed-loop control mode, the power drive circuit 40 operates while the temperature drive circuit 50 does not, controlling only the output power of the laser emitter 60. In the dual-power and temperature closed-loop control mode, both the power drive circuit 40 and the temperature drive circuit 50 operate, simultaneously controlling both the output power and temperature of the laser emitter 60.

[0054] The second target power is the expected value of the output power of the laser emitter 60 corresponding to the operating mode of the power control device 100. Optionally, the second target power can be a single target power value or a range of target power values. The control circuit 10 compares the current output power with the second target power to determine whether the current output power is the second target power or within the range of the second target power. Based on the comparison result, the operating mode of the temperature drive circuit 50 is controlled, ensuring that the first target power is not greater than the second target power. The operating mode of the temperature drive circuit 50 can include an operating mode and a sleep mode.

[0055] Optionally, when the output power of the laser emitter 60 is low and the heat dissipation effect is good, the temperature change of the laser emitter 60 is low. At this time, the control circuit 10 determines the working mode of the temperature drive circuit 50 to be sleep mode based on the output power and the second target power. At this time, the power control device 100 operates in single-power closed-loop control mode. The control circuit 10 adjusts the output power of the laser emitter 60 by fine-tuning the output current value of the power drive circuit 40, thereby compensating for the output power fluctuations caused by internal component aging or external environmental changes. Optionally, in this mode, to prevent sudden events such as physical mechanical vibration from causing laser heat dissipation failure, when an abnormal situation is detected, the temperature sampling circuit 30 is activated. The control circuit 10 sets a temperature protection threshold. When the temperature of the laser emitter 60 exceeds the temperature protection threshold, the temperature drive circuit 50 is activated to reduce the temperature of the laser emitter 60. If the temperature does not drop below the normal temperature threshold within a specified time, the laser emitter 60 is immediately shut down to protect the laser emitter 60 from damage.

[0056] When the laser emitter 60 has a high output power and limited heat dissipation, the laser temperature fluctuates significantly, resulting in large variations in laser output power. Therefore, it needs to operate in a dual closed-loop control mode for both power and temperature. Before the laser emitter 60 starts up, the control circuit 10 controls the temperature drive circuit 50 through a closed loop to maintain a stable temperature for the laser emitter 60. Afterward, it controls the power drive circuit 40 to operate the laser emitter 60, using closed-loop control to ensure a stable laser output power by controlling the current flowing through the laser emitter 60.

[0057] Optionally, when operating in single-power closed-loop control mode, the temperature drive circuit 50 is not in operation, and the laser emitter 60 has a lower power, resulting in lower system power consumption. This mode is suitable for applications with low power output and low system power consumption requirements. When operating in dual-power and temperature closed-loop control mode, the temperature drive circuit 50 consumes more power, and the laser emitter 60 generally has a higher power, resulting in higher system power consumption. This mode is suitable for applications with higher power output and higher system power tolerance.

[0058] The temperature sampling circuit 30 is used to collect the temperature value of the laser emitter 60. The control circuit 10 is also used to adjust the temperature of the laser emitter 60 according to the temperature value and the target temperature value when the temperature driving circuit 50 is in the running mode.

[0059] The temperature sampling circuit 30 may include a temperature sensor, which collects the temperature value of the laser emitter 60 and outputs the collected temperature value to the control circuit 10. If the control circuit 10 determines that the temperature driving circuit 50 is in the operating mode based on the above conditions, it compares the received temperature value with the target temperature value. Optionally, the target temperature value is the normal operating temperature value of the laser emitter 60. The target temperature value can be a fixed temperature value or a temperature range. The temperature of the laser emitter 60 is adjusted by the temperature driving circuit 50 based on the comparison result between the temperature value and the target temperature value.

[0060] In the above embodiment, the power control device includes a control circuit, a power sampling circuit, a temperature sampling circuit, a power drive circuit, a temperature drive circuit, and a laser emitter. The power sampling circuit collects the output power of the laser emitter and transmits it to the control circuit. The control circuit adjusts the output current value of the power drive circuit based on the output power and a first target power, and controls the operating mode of the temperature drive circuit based on the output power and the second target power; the first target power is not greater than the second target power. The temperature sampling circuit collects the temperature value of the laser emitter. The control circuit also adjusts the temperature of the laser emitter based on the temperature value and the target temperature value when the temperature drive circuit is in operating mode. Thus, the power control device can adjust the output current value output to the laser emitter by acquiring the output power of the laser emitter, thereby adjusting the output power of the laser emitter.

[0061] Furthermore, the output control can also control the operating mode of the temperature drive circuit, thereby adjusting the temperature of the laser emitter when the temperature drive circuit is running.

[0062] In an embodiment of this application, the control circuit 10 is configured to output a first control signal to the power drive circuit 40 when the output power is greater than the first target power; the first control signal is configured to instruct the power drive circuit 40 to reduce the output current value; or, when the output power is less than the first target power, the control circuit 10 is configured to output a second control signal to the power drive circuit 40; the second control signal is configured to instruct the power drive circuit 40 to increase the output current value.

[0063] Optional, such as Figure 2As shown, the power drive circuit 40 may include a constant current control circuit 41 and a constant current drive circuit 42 connected to each other. The control circuit 10 generates a PWM (Pulse Width Modulation) or analog voltage control signal through the constant current control circuit 41 and inputs it into the constant current drive circuit 42. The target current is output through the constant current drive circuit 42 and flows through the laser emitter 60. At this time, the laser emitter 60 works and outputs a certain optical power.

[0064] The power sampling circuit 20 may include a first sampling circuit 21 and a first analog-to-digital converter circuit 22. The first sampling circuit 21 collects the output power of the laser emitter 60 and converts it into an analog voltage signal, which is then output to the first analog-to-digital converter circuit 22. The first analog-to-digital converter circuit 22 converts the signal into a digital signal, which is then input to the control circuit 10.

[0065] The control circuit 10 compares the received output power with the first target power. When the output power is greater than the first target power or greater than the maximum value of the power range corresponding to the first target power, the control circuit 10 outputs a first control signal to control the power drive circuit 40 to reduce the output current value to the laser emitter 60. When the output power is less than the first target power or less than the minimum value of the power range corresponding to the first target power, the control circuit 10 outputs a second control signal to control the power drive circuit 40 to increase the output current value to the laser emitter 60, thereby enabling the laser emitter 60 to output stably.

[0066] In the above embodiments, by judging the comparison result between the output power and the first target power, the output current value output to the laser emitter 60 is adjusted according to the comparison result, thereby stabilizing the output power of the laser emitter 60.

[0067] In an embodiment of this application, the control circuit 10 is used to control the temperature drive circuit 50 to switch to operating mode when the output power is greater than the second target power.

[0068] Understandably, if the output power exceeds the second target power (which, within the range of the second target power, is greater than the maximum value of that range), then temperature control is required simultaneously. The temperature drive circuit 50 is then switched to operating mode, performing dual closed-loop control of both power and temperature. Optionally, the control circuit 10 can also be configured to operate in a sleep mode when the output power is not greater than the second target power (i.e., less than the second target power or less than the minimum value of the range corresponding to the second target power). In this case, temperature control is not required, and the operating mode of the temperature drive circuit 50 is set to sleep mode.

[0069] In one embodiment, please refer to Figure 3The laser emitter 60 includes a cooling chip 61 and a heating film 62. The temperature driving circuit 50 includes a cooling driving circuit 51 and a heating driving circuit 52. The cooling driving circuit 51 is connected to the cooling chip 61, and the heating driving circuit 52 is connected to the heating film 62.

[0070] Among them, such as Figure 3 As shown, a temperature regulation module is provided on the laser emitter 60. The temperature regulation module includes a cooling chip 61 and a heating film 62. The temperature regulation module is structurally connected to the laser emitter 60.

[0071] The control circuit 10 is used to output a third control signal to the cooling drive circuit 51 when the temperature value is greater than the target temperature value; the third control signal is used to drive the cooling chip 61 to cool; or, when the temperature value is less than the target temperature value, it outputs a fourth control signal to the heating drive circuit 52; the fourth control signal is used to drive the heating film 62 to heat.

[0072] The cooling element 61 can be a TEC cooling element, which is a solid-state thermoelectric cooler based on the Peltier effect. It is commonly used in small, precision temperature control applications. It achieves directional heat transfer through direct current drive. When current flows through it, the cold surface absorbs heat and its temperature decreases, while the hot surface releases heat and its temperature increases. The heating film 62 can convert electrical energy into heat energy, and can heat the laser emitter 60 after being powered on.

[0073] Optionally, the temperature sampling circuit 30 may include a second sampling circuit 31 and a second analog-to-digital converter (ADC) circuit 32. The second sampling circuit 31 acquires the temperature of the laser emitter 60 and converts it using the second ADC circuit 32 before outputting it to the control circuit 10. When the control circuit 10 determines that the temperature value is greater than the target temperature value, it outputs a third control signal through the cooling drive circuit 51. The third control signal is used to supply power to the TEC cooling chip 61, thereby reducing the temperature of the laser emitter 60. When the temperature value is less than the target temperature value, it outputs a fourth control signal through the heating drive circuit 52. The fourth control signal is used to supply power to the heating film 62, thereby increasing the temperature of the laser emitter 60, thus stabilizing the temperature of the laser emitter 60 and ensuring stable output power.

[0074] In the above embodiments, the temperature of the laser emitter 60 is controlled by a cooling chip and a heating film, thereby avoiding the influence of stable changes on the output power and stabilizing the output power of the laser emitter 60.

[0075] In one embodiment, the response speed of the power control device 100 is mainly determined by the operating frequency of the control circuit 10, the conversion time of the digital-to-analog converter circuit, and the response time of the power sampling circuit 20, with the first sampling circuit 21 playing a key role. Therefore, depending on the response speed requirements of different applications, different types of laser power first sampling circuits 21 can be used, mainly including voltage amplifier circuits with slower response speeds and cross-group amplifier circuits with faster response speeds.

[0076] Optionally, the power sampling circuit 20 includes a voltage amplification circuit; the voltage amplification circuit is used to acquire the current signal of the photodiode of the laser emitter 60 and determine the output power based on the current signal.

[0077] The first sampling circuit 21 of the power sampling circuit 20 may include a voltage amplifier circuit, and the structural diagram of the voltage amplifier circuit can be as follows: Figure 4 As shown, R1 is the sampling resistor, and R2 and R3 form the feedback amplification resistor. The voltage amplification circuit collects the current signal from the photodiode of the laser emitter 60, which is generally a weak current signal. This signal is converted into a voltage signal by the sampling resistor R1, and then amplified by a factor of R3 / R2+1 by the feedback resistors R2 and R3, outputting an analog voltage to the subsequent digital-to-analog converter circuit. Optionally, if the laser emitter 60 does not have an integrated photodiode, a photodiode can be connected in parallel with the sampling resistor R1 in the voltage amplification circuit to collect the optical power output by the laser emitter 60.

[0078] In this embodiment, since the voltage amplifier circuit adopts voltage negative feedback, the input impedance is high and the parasitic capacitance inside the voltage amplifier circuit is large. The time constant T=RC determines the response speed. The larger T is, the slower the response time. Therefore, the voltage amplifier circuit has a slow response time and is suitable for applications with low requirements for response speed. However, the first sampling circuit 21 composed of this voltage amplifier circuit has the advantage of low cost.

[0079] In one embodiment, the power sampling circuit 20 includes a cross-group amplifier circuit; the cross-group amplifier circuit is used to acquire the current signal on the photodiode of the laser emitter 60 and determine the output power based on the current signal.

[0080] The first sampling circuit 21 of the power sampling circuit 20 may further include a cross-group amplifier circuit, the structural schematic of which can be shown in the figure below. Figure 5As shown, R4 is the cross-group amplification resistor, C1 is the feedback compensation capacitor, and D1 is a photodiode. D1 converts the laser output from the laser diode of the laser emitter 60 into a current signal. This current signal flows through the feedback resistor R4 to the output terminal Vout, so Vout = R4 * Ipd, where Ipd is the current flowing through the photodiode. The output power of the laser emitter 60 can be calculated from Ipd. Ipd is directly proportional to the output optical power of the laser emitter 60; the higher the output optical power of the laser emitter 60, the higher Ipd. When Ipd is constant, a larger feedback voltage R4 results in a larger Vout, but a smaller system bandwidth. The system bandwidth calculation formula is shown below, where Cs is the parasitic capacitance inside the cross-group amplifier, and GBP is the gain-bandwidth product of the cross-group amplifier.

[0081]

[0082] In the above embodiments, since the cross-group amplifier operational amplifier adopts current negative feedback and has a small parasitic capacitance, the system bandwidth is high and the response time is fast, making it suitable for applications with high response speed requirements.

[0083] Optionally, some laser emitters 60 integrate the aforementioned photodiode, while others do not. The photodiode can be located in the first sampling circuit 21. In the case where the laser emitter 60 integrates the photodiode, the photodiode and the laser diode are connected in series, such as... Figure 6 As shown, at this time, the negative terminal PD- of the photodiode built into the laser emitter 60 can be directly connected to the feedback circuit R4 and C1, and the positive terminal PD+ can be connected to the reverse bias voltage Vb. When the laser diode is working, the negative terminal LD- is usually grounded, and the positive terminal LD+ is connected to a positive voltage. Therefore, PD- is also a voltage. At this time, grounding PD+ will enable the photodiode to work in a reverse bias state, as shown. Figure 7 As shown.

[0084] In one embodiment, if a higher reverse bias voltage is required, a reverse bias circuit needs to be added. That is, the power sampling circuit 20 also includes a reverse bias circuit, which is connected to both the positive and negative terminals of the photodiode. The reverse bias circuit is used to provide a reverse bias voltage to the photodiode. Figure 8 As shown, the photodiode has a faster response speed and a smaller dark current at this time.

[0085] In one embodiment, this application also provides a laser device, including a power control device 100 as described in any of the above embodiments. The power control device 100 can achieve stable output of the laser device's output power, as specifically described above and will not be repeated here. Optionally, this laser device can be used in industrial cutting, welding, marking, medical aesthetics, precision measurement, communication transmission, 3D printing, scientific spectroscopy, and stage lighting, among other applications.

[0086] In one exemplary embodiment, this application also provides a power control method, which is applied to a power control device 100 as described in any of the above embodiments, such as... Figure 9 As shown, the method includes:

[0087] Step 901: Obtain the output power and temperature values ​​of the laser emitter.

[0088] Step 902: Adjust the output current value of the power drive circuit according to the output power and the first target power, and control the working mode of the temperature drive circuit according to the output power and the second target power.

[0089] The first target power is no greater than the second target power.

[0090] Step 903: When the temperature driving circuit is in the running mode, the temperature of the laser emitter is adjusted by the temperature driving circuit according to the temperature value and the target temperature value.

[0091] The controller circuit acquires the output power and temperature values ​​of the laser emitter. If operating in a single-loop power control mode, it adjusts the output current value of the power drive circuit based on the comparison between the output power and the first target power. If operating in a dual-loop power and temperature control mode, it controls the operating mode of the temperature drive circuit to either run or sleep mode based on the output power and the second target power. When the temperature drive circuit is in run mode, it adjusts the temperature of the laser emitter based on the comparison between the current temperature value and the target temperature value. The specific implementation is as described in the power control device section of the above embodiments and will not be repeated here.

[0092] In this embodiment, power detection and power closed-loop control are added to the constant current control of the laser emitter, enabling rapid and precise adjustment of the output power to compensate for laser output power drift caused by temperature changes, device aging, etc. Simultaneously, temperature closed-loop control is added to the single power closed-loop control to ensure the laser operates within a reliable temperature range, guaranteeing the stability of the laser output power while extending its service life.

[0093] Depending on the laser output power, two operating modes are employed: single-power closed-loop control and dual-power-temperature closed-loop control. In low-power output applications, only single-power closed-loop control is used, with temperature closed-loop control only activating overheat and overcooling protection. This ensures stable laser output while reducing power consumption. In high-power output applications, dual-power and temperature closed-loop control is used to guarantee low noise and stability in laser output.

[0094] Furthermore, based on the response speed requirements of the power control device, two different detection circuits are adopted: a voltage amplifier circuit and a cross-group amplifier circuit. The voltage amplifier circuit has a slower response speed but lower cost, while the cross-group amplifier circuit can achieve a fast response speed but has a higher cost.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0096] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power control device, characterized by, The device comprises a control circuit, a power sampling circuit, a temperature sampling circuit, a power driving circuit, a temperature driving circuit and a laser emitter; The power sampling circuit is configured to collect output power of the laser emitter and transmit the output power to the control circuit; The control circuit is configured to adjust an output current value of the power driving circuit according to the output power and a first target power, and control an operation mode of the temperature driving circuit according to the output power and a second target power; the first target power is not greater than the second target power; The temperature sampling circuit is configured to collect a temperature value of the laser emitter; The control circuit is further configured to adjust the temperature of the laser emitter through the temperature driving circuit according to the temperature value and a target temperature value when the operation mode of the temperature driving circuit is a running mode.

2. The power control device of claim 1, wherein The control circuit is configured to output a first control signal to the power driving circuit when the output power is greater than the first target power; the first control signal is used to instruct the power driving circuit to reduce the output current value; Or, output a second control signal to the power driving circuit when the output power is less than the first target power; the second control signal is used to instruct the power driving circuit to increase the output current value.

3. The power control device of claim 1, wherein The control circuit is configured to control the temperature driving circuit to switch to a running mode when the output power is greater than the second target power.

4. The power control device of claim 3, wherein The laser emitter comprises a cooling fin and a heating film, the temperature driving circuit comprises a cooling driving circuit and a heating driving circuit, the cooling driving circuit is connected with the cooling fin, and the heating driving circuit is connected with the heating film.

5. The power control device of claim 4, wherein The control circuit is configured to output a third control signal to the cooling driving circuit when the temperature value is greater than the target temperature value; the third control signal is used to drive the cooling fin to cool; Or, output a fourth control signal to the heating driving circuit when the temperature value is less than the target temperature value; the fourth control signal is used to drive the heating film to heat.

6. The power control device of claim 1, wherein The power sampling circuit comprises a voltage amplification circuit; the voltage amplification circuit is configured to collect a current signal of a photodiode of the laser emitter, and determine the output power based on the current signal.

7. The power control device of claim 1, wherein The power sampling circuit comprises a cross-group amplification circuit; the cross-group amplification circuit is configured to collect a current signal on the photodiode of the laser emitter, and determine the output power based on the current signal.

8. The power control device of claim 7, wherein, The power sampling circuit further comprises a reverse bias circuit, and the reverse bias circuit is connected with the anode and cathode of the photodiode respectively; The reverse bias circuit is configured to provide a reverse bias voltage to the photodiode.

9. A laser apparatus, characterized by comprising: The method is applied to the power control device as claimed in any one of claims 1 to 8, and the method comprises:

10. A power control method, characterized by, collecting output power and a temperature value of a laser emitter; ​ According to the output power and a first target power, an output current value of the power driving circuit is adjusted, and a working mode of the temperature driving circuit is controlled according to the output power and a second target power; the first target power is not greater than the second target power; In a case where the working mode of the temperature driving circuit is a running mode, a temperature of the laser emitter is adjusted by the temperature driving circuit according to the temperature value and a target temperature value.

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