Pump driving method of laser and laser

Abstract

The invention discloses a pumping driving method of a laser and the laser, and belongs to the technical field of driving circuits. The method comprises the following steps: performing voltage sampling on a pumping device through a sampling circuit, and outputting a sampling voltage value; a voltage control signal corresponding to the working mode of the pumping device is generated through the FPGA main control module according to the sampling voltage value, the voltage control signal is transmitted to the voltage regulation circuit through the first output end, and a current modulation signal corresponding to the working mode of the pumping device is generated and transmitted to the current modulation circuit through the second output end; the output end of the voltage regulating circuit is set to be output voltage corresponding to the working mode through the voltage regulating circuit according to the voltage control signal; and outputting a control signal corresponding to the working mode through a current modulation circuit according to the current modulation signal. According to the method, the voltage control signal and the current modulation signal corresponding to the working mode of the pumping device can be output, and the power consumption of the current modulation circuit is reduced while the duration of the current waveform rising edge is shortened.

Description

Technical Field

[0001] The present application belongs to the technical field of drive circuits, and in particular, relates to a pump drive method for a laser and a laser. Background Art

[0002] During the use of the laser, the pump operating voltage increases with the increase of the operating current. The operating current is different in different working modes, and the voltage difference required for the pump operation also has a large range, and the maximum voltage difference can reach more than 2V.

[0003] In order to meet the switching response speed of the pump current in the laser, a linear current source is generally used. When the linear current source meets various working conditions of the laser, such as different currents and pulse modes, its pump power supply must have enough margin ΔV1 to be compatible with multiple working conditions. Usually ΔV1 ≥ 2V. For example, the laser diode has a maximum working current corresponding to an operating voltage of 30V, and can adjust the voltage range corresponding to multiple working modes according to the working mode.

[0004] In existing laser circuits, pump devices have relatively high requirements for switch response speed. In order to shorten the rising edge of the pump and ensure circuit performance, a higher voltage is required for backward compatibility, resulting in excessive voltage drop of the MOS tube and excessive power consumption in the continuous current mode. If a lower voltage is provided to reduce power consumption, the duration of the rising edge of the pump current waveform becomes longer and the switch response speed becomes slower. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a pump driving method of a laser and a laser, which can output a voltage control signal and a current modulation signal corresponding to the working mode of the pump device, shorten the duration of the rising edge of the current waveform and reduce the power consumption of the current modulation circuit.

[0006] In a first aspect, the present application provides a pump driving method for a laser, which is applied to a pump driving circuit of a pump device, wherein the pump driving circuit comprises: an FPGA main control module, a voltage regulating circuit, a current modulation circuit and a sampling circuit;

[0007] The first output end of the FPGA main control module is connected to the input end of the pump device and the first input end of the sampling circuit through a voltage regulating circuit;

[0008] The second output end of the FPGA main control module is connected to the output end of the pump device and the second input end of the sampling circuit through the current modulation circuit;

[0009] The output end of the sampling circuit is connected to the input end of the FPGA main control module;

[0010] The circuit comprises:

[0011] The sampling circuit samples the voltage of the pump device and outputs the sampled voltage value;

[0012] By means of the FPGA main control module, a voltage control signal corresponding to the working mode of the pump device is generated according to the sampled voltage value, and the voltage control signal is output to the voltage regulating circuit through the first output terminal, and a current modulation signal corresponding to the working mode of the pump device is generated, and the current modulation signal is output to the current modulation circuit through the second output terminal;

[0013] By means of the voltage regulating circuit, according to the voltage control signal, the output end of the voltage regulating circuit is set to the output voltage corresponding to the working mode;

[0014] The current modulation circuit outputs a control signal corresponding to the working mode according to the current modulation signal.

[0015] According to an embodiment of the present application, the sampling circuit includes a signal processing circuit and an ADC sampling module connected in sequence, and the sampling circuit performs voltage sampling on the pump device and outputs a sampled voltage value, including:

[0016] The signal processing circuit collects and amplifies the signal of the pump device and outputs a voltage signal;

[0017] The voltage signal is sampled through the ADC sampling module to output a sampled voltage value.

[0018] According to one embodiment of the present application, the signal processing circuit includes: a resistor R1, a resistor R2, a resistor R3, and a resistor R4, a resistor R5, a resistor R6, a second operational amplifier, a capacitor C1, a capacitor C2 and a voltage stabilizing diode D;

[0019] One end of the resistor R1 is connected to the first input end of the signal processing circuit, and the other end of the resistor R1 is connected to one end of the resistor R2 and the second input end of the signal processing circuit;

[0020] The other end of the resistor R2 is connected to the non-inverting input terminal of the second operational amplifier and is grounded through the resistor R3;

[0021] Capacitor C1 and Zener diode D are both connected in parallel with resistor R3;

[0022] The inverting input terminal of the second operational amplifier is connected to one end of the resistor R5 and is grounded through the resistor R4;

[0023] The other end of the resistor R5 is connected to the output end of the second operational amplifier and one end of the resistor R6 , and the other end of the resistor R6 is connected to the output end of the signal processing circuit and is grounded through the capacitor C2 .

[0024] According to an embodiment of the present application, the current modulation circuit includes a modulation voltage output module and a current source connected in sequence, and the current modulation circuit outputs a control signal corresponding to the working mode according to the current modulation signal, including:

[0025] Generate a control pulse according to the current modulation signal through the modulation voltage output module;

[0026] A control signal corresponding to the working mode is outputted through the current source according to the control pulse.

[0027] According to one embodiment of the present application, the current source includes a first operational amplifier, a resistor R sense and MOS tubes;

[0028] The same-direction input terminal of the first operational amplifier is connected to the output terminal of the modulation voltage output module, and the reverse input terminal of the first operational amplifier is connected to the resistor R sense One end and the source of the MOS tube, the resistor R sense The other end is grounded;

[0029] The output end of the first operational amplifier is connected to the gate of the MOS tube, and the drain of the MOS tube is connected to the output end of the pump device and the input end of the signal processing circuit.

[0030] According to an embodiment of the present application, the voltage regulating circuit includes a voltage regulating module and a DC / DC power supply module connected in sequence, and the output end of the voltage regulating circuit is set to the output voltage corresponding to the working mode according to the voltage control signal through the voltage regulating circuit, including:

[0031] Outputting an analog voltage according to the current modulation signal through the voltage regulation module;

[0032] The output voltage is adjusted according to the analog voltage through the DC / DC power supply module.

[0033] According to one embodiment of the present application, the voltage regulating module includes a DAC chip and a resistor R8 connected in sequence;

[0034] The input end of the DAC chip is connected to the first output end of the FPGA main control module;

[0035] The output end of the DAC chip is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the output end of the voltage regulating module.

[0036] According to one embodiment of the present application, the DC / DC power supply module includes a resistor R7, a resistor R9 and a power supply IC;

[0037] One end of the resistor R7 is connected to the input end of the pump device, and the other end of the resistor R7 is connected to the input end of the DC / DC power module and the output end of the power IC, and is grounded through a resistor R9.

[0038] According to an embodiment of the present application, the pumping device is a laser diode LD.

[0039] In a second aspect, the present application provides a laser for executing the laser pump driving method as described in the first aspect.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

[0041] The present application provides a laser pump driving method and a laser, which have the following beneficial effects compared with the prior art:

[0042] (1) The voltage of the pump device is sampled through the sampling circuit. The FPGA main control module outputs the voltage control signal and current modulation signal corresponding to the working mode of the pump device according to the sampled voltage value. It can provide sufficient voltage difference and large current for the pump device, shorten the duration of the rising edge of the current waveform, and reduce the power consumption of the current modulation circuit. It has the characteristics of high efficiency and high performance. By accurately adjusting the pump voltage and current, the stability, efficiency and performance of the laser are ensured.

[0043] (2) The signal processing circuit and ADC sampling module can realize accurate monitoring of the working status of the pump device. The signal processing circuit effectively amplifies and filters the signal to ensure that the signal is clear and stable. The ADC sampling module converts the analog signal into a digital signal for subsequent processing. The entire laser pump drive circuit can efficiently realize closed-loop control, optimize the operating performance of the laser, and improve the response speed and accuracy of the laser pump drive circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0045] Figure 1 This is one of the structural schematic diagrams of the pump driving circuit of the laser provided in the embodiment of the present application;

[0046] Figure 2 It is a schematic flow chart of a pump driving method for a laser provided in an embodiment of the present application;

[0047] Figure 3 This is the second structural schematic diagram of the pump driving circuit of the laser provided in the embodiment of the present application;

[0048] Figure 4 is a schematic diagram of the structure of a signal processing circuit provided in an embodiment of the present application;

[0049] Figure 5 is a structural schematic diagram of a voltage regulating module provided in an embodiment of the present application;

[0050] Figure 6 It is a schematic diagram of the working process of the pump driving circuit of the laser provided in the embodiment of the present application;

[0051] Reference numerals:

[0052] FPGA main control module 110 ; voltage regulation circuit 120 ; current modulation circuit 130 ; sampling circuit 140 . DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0054] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0055] The pump driving method and the laser provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0056] like Figure 1 As shown, the pump driving circuit of the laser includes an FPGA main control module 110, a voltage regulating circuit 120, a current modulation circuit 130 and a sampling circuit 140;

[0057] The first output end of the FPGA main control module 110 is connected to the input end of the pump device and the first input end of the sampling circuit 140 through the voltage regulating circuit 120;

[0058] The second output end of the FPGA main control module 110 is connected to the output end of the pump device and the second input end of the sampling circuit 140 through the current modulation circuit 130;

[0059] The output end of the sampling circuit 140 is connected to the input end of the FPGA main control module 110;

[0060] like Figure 2 As shown, the method includes:

[0061] Step 210, sampling the voltage of the pump device through the sampling circuit 140, and outputting the sampled voltage value;

[0062] Step 220: Generate a voltage control signal corresponding to the working mode of the pump device according to the sampled voltage value through the FPGA main control module 110, output the signal to the voltage regulator circuit 120 through the first output terminal, and generate a current modulation signal corresponding to the working mode of the pump device, output the signal to the current modulation circuit 130 through the second output terminal;

[0063] Step 230, setting the output end of the voltage regulating circuit 120 to an output voltage corresponding to the working mode according to the voltage control signal through the voltage regulating circuit 120;

[0064] Step 240: Output a control signal corresponding to the working mode according to the current modulation signal through the current modulation circuit 130.

[0065] In some embodiments, the pump device is a laser diode LD.

[0066] The FPGA main control module 110 may be a Field Programmable Gate Array (FPGA) main control board.

[0067] The FPGA main control module 110 is used to control signal generation, feedback processing and working mode switching. Its main function is to generate the voltage and current modulation signals required by the pump device according to the feedback voltage sampling value to control the working state of the voltage regulation circuit 120 and the current modulation circuit 130.

[0068] The FPGA main control module 110 obtains the voltage feedback of the pump device through the output end of the sampling circuit 140. The voltage value reflects the working state of the pump device; according to the sampled voltage value, the FPGA main control module 110 generates a voltage control signal and a current modulation signal according to the preset working mode of the pump device (such as power mode, frequency mode, etc.); the first output end of the FPGA main control module 110 outputs the voltage control signal to the input end of the voltage regulating circuit 120, and the second output end outputs the current modulation signal to the input end of the current modulation circuit 130; through the feedback interaction with the voltage regulating circuit 120 and the current modulation circuit 130, the FPGA main control module 110 realizes precise control of the pump device to ensure that it works in an ideal mode.

[0069] In the voltage regulating circuit 120 , a digital-to-analog converter (DAC) or an adjustable voltage regulated power supply module may be used.

[0070] The voltage regulating circuit 120 adjusts the output voltage according to the voltage control signal output by the FPGA main control module 110, thereby achieving fine regulation of the voltage of the pump device.

[0071] The voltage regulating circuit 120 adjusts the output voltage to the working voltage required by the corresponding pump device according to the voltage control signal from the FPGA main control module 110. The voltage regulation process can be achieved by adjusting a transformer, a power supply voltage regulator module or a digital-to-analog converter (DAC) and other components.

[0072] The voltage regulating circuit 120 can monitor the output voltage by cooperating with the sampling circuit 140 and feed back the voltage to the FPGA main control module 110 to ensure that the voltage control signal is continuously adjusted according to the feedback value.

[0073] In the current modulation circuit 130 , a digital current source and a current regulating chip (such as an operational amplifier, an analog switch, etc.) may be provided.

[0074] The current modulation circuit 130 adjusts the driving current of the pump device according to the current modulation signal output by the FPGA main control module 110. This is very important for adjusting the output power, efficiency and stability of the laser.

[0075] The current modulation circuit 130 adjusts the operating current of the pump device according to the current modulation signal. The current may be realized by an adjustable current source, a digitally controlled current regulation circuit or an analog current regulation circuit; the current modulation circuit 130 can quickly respond to the regulation signal of the FPGA main control module 110 to ensure the stable operation of the pump device in different working modes.

[0076] In the sampling circuit 140 , a voltage sensor, an analog-to-digital converter (ADC), etc. may be used to implement voltage sampling and signal transmission.

[0077] The sampling circuit 140 is responsible for obtaining the feedback voltage value from the pump device and transmitting it to the FPGA main control module 110. The accuracy of the sampling circuit 140 is crucial to the regulation accuracy of the entire circuit.

[0078] The sampling circuit 140 is connected to the input or output of the pump device in parallel or in series to sample the voltage value of the pump device in real time; the sampling circuit 140 transmits the sampled voltage value to the input of the FPGA through a signal channel to provide the FPGA with necessary feedback information; in order to improve system stability, the sampling circuit 140 may include a filtering circuit to remove noise and ensure the accuracy of the sampling signal.

[0079] In actual execution, the FPGA main control module 110 generates an initial voltage and current modulation signal according to a preset working mode of the pump device (for example, the power mode and frequency mode of the laser, etc.). The sampling circuit 140 monitors the working voltage of the pump device in real time and feeds back the voltage value to the FPGA main control module 110. The PGA calculates and adjusts the voltage control signal and the current modulation signal according to the feedback voltage value to optimize the working state of the pump device. The voltage regulating circuit 120 and the current modulation circuit 130 respectively receive the control signal of the FPGA and adjust the output voltage to adapt to the input voltage and driving voltage of the pump device. Under the joint regulation of the FPGA main control module 110 and various circuit modules, the pump device works stably in its working mode.

[0080] According to the pump driving method of the laser provided in the embodiment of the present application, the voltage of the pump device is sampled by a sampling circuit, and the FPGA main control module outputs a voltage control signal and a current modulation signal corresponding to the working mode of the pump device according to the sampled voltage value, which can provide a sufficient voltage difference and a large current for the pump device, shorten the duration of the rising edge of the current waveform, and reduce the power consumption of the current modulation circuit. It has the characteristics of high efficiency and high performance, and ensures the stability, efficiency and performance of the laser by accurately adjusting the pump voltage and current.

[0081] In some embodiments, Figure 3 As shown, the sampling circuit 140 includes a signal processing circuit and an ADC sampling module connected in sequence. The sampling circuit samples the voltage of the pump device and outputs the sampled voltage value, including:

[0082] The signal processing circuit collects and amplifies the signal of the pump device and outputs a voltage signal;

[0083] The voltage signal is sampled through the ADC sampling module to output a sampled voltage value.

[0084] The output end of the pump device is connected to the input end of the FPGA main control module 110 through the signal processing circuit and the ADC sampling module.

[0085] The role of the signal processing circuit is to obtain the signal from the pump device and amplify it to ensure that the signal is suitable for further sampling.

[0086] Signal acquisition obtains the low-level voltage analog signal output from the pump device. Since the signal output by the pump device may be too weak, it needs to be amplified to a range suitable for sampling through an amplifier with adjustable gain in the amplification circuit. In order to remove noise, the signal may need to be processed by a filter after amplification to remove high-frequency noise components and ensure that the sampled signal is stable and clean.

[0087] The first input end of the signal processing circuit is connected to the input end of the pump device, and the second input end of the signal processing circuit is connected to the output end of the pump device to obtain the analog voltage signal transmitted from the pump device.

[0088] The signal enters an adjustable gain operational amplifier (Op-Amp) in the signal processing circuit to amplify the weak signal to a voltage range suitable for sampling. For example, if the input signal is 1mV and the ADC sampling module requires a 2V input range, the amplifier will amplify the signal to the required range.

[0089] To reduce noise interference, the signal enters a low-pass filter after amplification, for example, through an RC filter to remove high-frequency noise or other unwanted frequency components.

[0090] The amplified and filtered signal will be passed to the ADC sampling module through the output end. The output voltage signal is clear and stable, which can ensure the accuracy of subsequent sampling.

[0091] Among them, the voltage signal is a continuously changing voltage value, which reflects the actual working state of the pump device.

[0092] The ADC sampling module converts the voltage signal (analog signal) output by the signal processing circuit into a digital signal, and transmits the sampled voltage value to the FPGA main control module 110 .

[0093] The input end of the ADC sampling module is connected to the output end of the signal processing circuit to receive the processed voltage signal.

[0094] The ADC sampling module samples the input voltage signal periodically. In the high-speed sampling mode, the sampling rate may reach several million times per second to ensure the responsiveness of the FPGA main control module 110 .

[0095] While sampling, the ADC quantizes the signal and converts the continuous analog signal into a discrete digital signal. For example, if the ADC has 12-bit accuracy, the analog signal can be mapped to a digital value between 0 and 4095.

[0096] The ADC module transmits the digitized sampled voltage value to the FPGA main control module 110 through a serial interface (such as SPI, I2C, etc.) or a parallel data bus. The digital signal facilitates subsequent data processing and analysis, and can achieve more precise control and regulation.

[0097] The sampled digital voltage value can be processed and analyzed by the FPGA main control module 110 or other microprocessors.

[0098] The FPGA main control module 110 dynamically adjusts the working state of the pump device according to the analysis result to optimize its performance.

[0099] In this embodiment, the signal processing circuit and the ADC sampling module can realize accurate monitoring of the working state of the pump device. The signal processing circuit effectively amplifies and filters the signal to ensure that the signal is clear and stable. The ADC sampling module converts the analog signal into a digital signal for subsequent processing. The pump drive circuit of the entire laser can efficiently realize closed-loop control, optimize the operating performance of the laser, and improve the response speed and accuracy of the pump drive circuit of the laser.

[0100] In some embodiments, Figure 4 As shown, the signal processing circuit includes: resistors R1, R2, R3, and R4, R5, R6, a second operational amplifier OP2, capacitors C1, C2 and a voltage stabilizing diode D;

[0101] One end of the resistor R1 is connected to the first input end of the signal processing circuit, and the other end of the resistor R1 is connected to one end of the resistor R2 and the second input end of the signal processing circuit;

[0102] The other end of the resistor R2 is connected to the non-inverting input end of the second operational amplifier OP2 and is grounded through the resistor R3;

[0103] Capacitor C1 and Zener diode D are both connected in parallel with resistor R3;

[0104] The inverting input terminal of the second operational amplifier OP2 is connected to one end of the resistor R5 and is grounded through the resistor R4;

[0105] The other end of the resistor R5 is connected to the output end of the second operational amplifier OP2 and one end of the resistor R6 , and the other end of the resistor R6 is connected to the output end of the signal processing circuit and is grounded through the capacitor C2 .

[0106] When the current source is not working, resistors R1, R2, and R3 provide a circuit for sampling the voltage division of the MOS tube. When the current source is working normally, V mos The voltage at the non-inverting input terminal of the second operational amplifier OP2 is reduced by the voltage division of the resistor R2 and the resistor R3.

[0107] When the current source is working normally or not working, the sampled voltage value V collected by the ADC sampling module is MOS Not the same.

[0108] The capacitor C1 is used for filtering, the voltage stabilizing diode D is used for voltage stabilization, the second operational amplifier OP2 is used for signal amplification, and the resistors R6 and C2 form an RC filter.

[0109] In the signal processing circuit, the voltage drop of the MOS tube is processed by voltage division and amplification to facilitate the sampling of the subsequent ADC sampling module.

[0110] In order to get V MOS , real-time adjustment of V out , so that V MOS Reach the voltage value corresponding to the working mode.

[0111] In some embodiments, the current modulation circuit 130 includes a modulation voltage output module and a current source connected in sequence, and the current modulation circuit outputs a control signal corresponding to the working mode according to the current modulation signal, including:

[0112] Generate a control pulse according to the current modulation signal through the modulation voltage output module;

[0113] A control signal corresponding to the working mode is outputted through the current source according to the control pulse.

[0114] The current regulating signal generated by the FPGA main control module 110 is used to regulate the output current of the current source.

[0115] The modulation voltage output module generates corresponding control pulses according to the input current modulation signal, thereby controlling the working mode of the current source. The modulation voltage output module modulates the voltage signal to adapt to the input requirements of the current source.

[0116] The modulation voltage output module receives the current modulation signal and generates a control voltage signal corresponding to the current modulation signal through modulation techniques such as PWM modulation circuit and digital filter circuit.

[0117] If the input current modulation signal is a digital signal, the modulation voltage output module can convert it into a modulation pulse through PWM technology. The frequency and duty cycle of the PWM signal determine the output characteristics of the current source. The modulation voltage signal generates a fixed-frequency square wave signal through the PWM modulation circuit, and the duty cycle is adjusted to control the output current.

[0118] For analog current modulation signals, the modulation voltage output module can convert the input signal into a smooth voltage signal through a filtering circuit such as a low-pass filter.

[0119] The modulation voltage output module generates a corresponding control pulse signal according to the modulation voltage. The control pulse may be a high-frequency PWM pulse or other types of pulse signals (such as a pulse with adjustable frequency or width) for controlling the switch of the current source and the output current.

[0120] The current source outputs a control signal corresponding to the working mode according to the received control pulse signal, which is used to drive the load and adjust the working current or voltage.

[0121] The current source receives a control pulse signal from the modulated voltage output module. The characteristics of the control pulse (such as frequency, duty cycle or pulse width) will affect the output current of the current source. The frequency and duty cycle of the control pulse determine the average current or current amplitude output by the current source.

[0122] According to the received control pulse signal, the current source determines the current working mode. The working modes can be divided into the following types:

[0123] In continuous current mode, the current source provides a stable output current, and the duty cycle or frequency of the control pulse may be used to adjust the output current of the current source.

[0124] In the pulse current mode, the current source needs to output current in a pulsed manner, and the pulse generated by the modulation voltage output module controls the amplitude and width of each pulse output by the current source.

[0125] The current source adjusts its output signal according to the control pulse. In the continuous current mode, the current source outputs a fixed current, or outputs a pulse signal of a certain width and intensity in the pulse current mode. The specific control method depends on the pulse characteristics transmitted by the modulation voltage output module.

[0126] In the modulation voltage output module, a DAC and an analog switch are included. The DAC outputs a stable and continuous voltage. In the continuous current mode, the analog switch is directly connected to control the pulse signal to be a stable and continuous voltage.

[0127] In the pulse current mode, after the analog switch is switched, a pulse analog signal with a certain amplitude, frequency and duty cycle is output as a control pulse signal.

[0128] In the current source, a precision operational amplifier, a current sensing element R sense It forms negative feedback with the MOS tube and generates a current output corresponding to the working mode under the control of the control pulse signal.

[0129] In this embodiment, the modulation voltage output module and the current source are used together to achieve precise control of the current output. The modulation voltage output module generates control pulses according to the current modulation signal, and the current source adjusts the output current according to these pulses, thereby achieving the operating mode and performance required by the system.

[0130] In some embodiments, the current source includes a first operational amplifier OP1, a resistor R sense and MOS tubes;

[0131] The same-direction input terminal of the first operational amplifier OP1 is connected to the output terminal of the modulation voltage output module, and the reverse input terminal of the first operational amplifier OP1 is connected to the resistor R sense One end and the source (S pole) of the MOS tube, the resistor R sense The other end is grounded;

[0132] The output end of the first operational amplifier OP1 is connected to the gate (G pole) of the MOS tube, and the drain (D pole) of the MOS tube is connected to the output end of the pump device and the input end of the signal processing circuit.

[0133] In some embodiments, the voltage regulating circuit 120 includes a voltage regulating module and a DC / DC power supply module connected in sequence, and the output end of the voltage regulating circuit is set to the output voltage corresponding to the working mode according to the voltage control signal through the voltage regulating circuit, including:

[0134] Outputting an analog voltage according to the current modulation signal through the voltage regulation module;

[0135] The output voltage is adjusted according to the analog voltage through the DC / DC power supply module.

[0136] In the voltage regulation module, the FPGA main control module 110 communicates with the DAC chip to make it output an analog voltage, which is superimposed on the FB pin of the DC / DC power supply chip to match the DAC output impedance and the input impedance of the current source. Then, through the analog switch (MOS tube), it enters the non-inverting input terminal of the first operational amplifier OP1, which enables the current source to output the corresponding current and achieve the voltage regulation effect.

[0137] In the pulse current mode, the pulse analog signal is output by switching the MOS tube on and off.

[0138] In some embodiments, Figure 5As shown, the voltage regulating module includes a DAC chip and a resistor R8 connected in sequence.

[0139] The input end of the DAC chip is connected to the first output end of the FPGA main control module 110;

[0140] The output end of the DAC chip is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the output end of the voltage regulating module.

[0141] In some embodiments, the DC / DC power supply module includes a resistor R7, a resistor R9 and a power supply IC;

[0142] One end of the resistor R7 is connected to the input end of the pump device, and the other end of the resistor R7 is connected to the input end of the DC / DC power module and the output end of the power IC, and is grounded through a resistor R9.

[0143] like Figure 6 As shown, the FPGA main control module 110 outputs the voltage control signal corresponding to the working mode of the pump device (laser diode LD);

[0144] The FPGA main control module 110 determines the working mode of the current source (the working mode of the pump device), including a pulse current mode (pulse pluse mode) and a continuous current mode (CW mode);

[0145] When the current source operates in CW mode, the sampling circuit samples the voltage at the output end of the laser diode LD and outputs the sampled voltage value V MOS To the FPGA main control module 110, the FPGA main control module 110 generates a voltage signal according to the sampling voltage value V MOS Output voltage control signal, adjust the output of DC / DC power module until the output voltage V CW ;

[0146] When the current source operates in the pulse plus mode, the sampling circuit samples the voltage at the output end of the laser diode LD and outputs the sampled voltage value V MOS To the FPGA main control module 110, the FPGA main control module 110 generates a voltage signal according to the sampling voltage value V MOS Output voltage control signal, adjust the output of DC / DC power module until the output voltage V pluse .

[0147] In this embodiment, the voltage drop of the MOS tube is controlled to adjust the signal output of the FPGA main control module 110, and the voltage V output by the DC / DC power supply module is adjusted. out Adjustments are made to meet the needs of the laser diode LD in various working modes, thereby reducing useless power consumption and improving efficiency.

[0148] In actual implementation, ΔV dc is the transient response voltage drop of the DC / DC power module when it is fully loaded, and the working current of the current source is I ld , the instantaneous power consumption of the MOS tube in the current source is P MOS In continuous current mode, the DC / DC power module outputs an output voltage of V CW In pulse current mode, the DC / DC power module outputs an output voltage of V pulse , the real-time working voltage of the pump is V LD .

[0149] In continuous current mode, the output voltage V CW for:

[0150] V CW =V LD +V MOS

[0151] V MOS According to the selected MOS tube V DS -I d The characteristic curve shows that V DS is the voltage difference between the drain voltage and the source voltage of the MOS tube, I d is the current from drain to source. If a certain margin ΔV2 is left on its basis, that is, V MOS =V DS +ΔV2, generally V MOS =0.5V can meet the working requirements.

[0152] Pulse current mode, output voltage V pulse for:

[0153] V pulse =V LD +V MOS +ΔV dc

[0154] ΔV dc It is related to the performance of the DC / DC power module, generally ±5% of the module output voltage. dc V out *5%, i.e. ΔV dc =V out *5%;

[0155] The output voltage of the DC / DC power module before improving efficiency is V out , that is, V out =V LDmax +ΔV1; ΔV1 is the supply voltage margin of the pump device, V LDmax It is the voltage when the laser diode LD operates at maximum current.

[0156] The same working current I LD Continuous current mode efficiency improvement:

[0157] ΔP CW =I LD *(V out -V CW )=I LD *[(V LDmax +ΔV1)-(V LD +V DS +ΔV2)]

[0158] The same working current I LD Pulse current mode efficiency improvement:

[0159] ΔP pulse =I LD *(V out -V pulse )=I LD *[(V LDmax +ΔV1)-(V LD +V DS +ΔV2+ΔV dc )]

[0160] The embodiments of the present application also provide a laser for executing the pump driving method of the laser as described in the above embodiments.

[0161] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0162] In the description of the present application, “plurality” means two or more.

[0163] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0164] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0165] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for pumping a laser, characterized in that: A pump driving circuit applied to a pump device, the pump driving circuit comprising an FPGA main control module, a voltage regulating circuit, a current modulation circuit and a sampling circuit; The first output end of the FPGA main control module is connected to the input end of the pump device and the first input end of the sampling circuit through a voltage regulating circuit; The second output end of the FPGA main control module is connected to the output end of the pump device and the second input end of the sampling circuit through the current modulation circuit; The output end of the sampling circuit is connected to the input end of the FPGA main control module; The method comprises: The sampling circuit samples the voltage of the pump device and outputs the sampled voltage value; By means of the FPGA main control module, a voltage control signal corresponding to the working mode of the pump device is generated according to the sampled voltage value, and the voltage control signal is output to the voltage regulating circuit through the first output terminal, and a current modulation signal corresponding to the working mode of the pump device is generated, and the current modulation signal is output to the current modulation circuit through the second output terminal; By means of the voltage regulating circuit, according to the voltage control signal, the output end of the voltage regulating circuit is set to the output voltage corresponding to the working mode; The current modulation circuit outputs a control signal corresponding to the working mode according to the current modulation signal.

2. The laser pump driving method according to claim 1, characterized in that: The sampling circuit includes a signal processing circuit and an ADC sampling module connected in sequence. The sampling circuit performs voltage sampling on the pump device and outputs a sampled voltage value, including: The signal processing circuit collects and amplifies the signal of the pump device and outputs a voltage signal; The voltage signal is sampled through the ADC sampling module to output a sampled voltage value.

3. The laser pump driving method according to claim 2, characterized in that: The signal processing circuit includes: a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a second operational amplifier, a capacitor C1, a capacitor C2 and a voltage stabilizing diode D; One end of the resistor R1 is connected to the first input end of the signal processing circuit, and the other end of the resistor R1 is connected to one end of the resistor R2 and the second input end of the signal processing circuit; The other end of the resistor R2 is connected to the non-inverting input terminal of the second operational amplifier and is grounded through the resistor R3; Capacitor C1 and Zener diode D are both connected in parallel with resistor R3; The inverting input terminal of the second operational amplifier is connected to one end of the resistor R5 and is grounded through the resistor R4; The other end of the resistor R5 is connected to the output end of the second operational amplifier and one end of the resistor R6 , and the other end of the resistor R6 is connected to the output end of the signal processing circuit and is grounded through the capacitor C2 .

4. The laser pump driving method according to claim 1, characterized in that: The current modulation circuit includes a modulation voltage output module and a current source connected in sequence, and outputs a control signal corresponding to the working mode according to the current modulation signal through the current modulation circuit, including: Generate a control pulse according to the current modulation signal through the modulation voltage output module; A control signal corresponding to the working mode is outputted through the current source according to the control pulse.

5. The laser pump driving method according to claim 4, characterized in that: The current source includes a first operational amplifier, a resistor R sense and MOS tubes; The same-direction input terminal of the first operational amplifier is connected to the output terminal of the modulation voltage output module, and the reverse input terminal of the first operational amplifier is connected to the resistor R sense One end and the source of the MOS tube, the resistor R sense The other end is grounded; The output end of the first operational amplifier is connected to the gate of the MOS tube, and the drain of the MOS tube is connected to the output end of the pump device and the input end of the signal processing circuit.

6. The laser pump driving method according to claim 1, characterized in that: The voltage regulating circuit comprises a voltage regulating module and a DC / DC power supply module connected in sequence, wherein the output end of the voltage regulating circuit is set to an output voltage corresponding to the working mode according to the voltage control signal through the voltage regulating circuit, including: Outputting an analog voltage according to the current modulation signal through the voltage regulation module; The output voltage is adjusted according to the analog voltage through the DC / DC power supply module.

7. The laser pump driving method according to claim 6, characterized in that: The voltage regulation module includes a DAC chip and a resistor R8 connected in sequence; The input end of the DAC chip is connected to the first output end of the FPGA main control module; The output end of the DAC chip is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the output end of the voltage regulating module.

8. The laser pump driving method according to claim 6, characterized in that: The DC / DC power supply module includes a resistor R7, a resistor R9 and a power supply IC; One end of the resistor R7 is connected to the input end of the pump device, and the other end of the resistor R7 is connected to the input end of the DC / DC power module and the output end of the power IC, and is grounded through a resistor R9.

9. The laser pump driving method according to claim 1, characterized in that: The pump device is a laser diode LD.

10. A laser, characterized in that: Used to execute the pump driving method of the laser as claimed in any one of claims 1 to 9.

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