A fiber laser pump source driver

Abstract

The present invention relates to a fiber laser pump source driver, the driver comprises a control mainboard, a 5V adjustable power module, a switch control module, a constant current module, an isolation output module and a PWM modulation module which are electrically connected in sequence, the PWM modulation module having a positive output terminal VO+ and a negative output terminal VO‑, the positive output terminal VO+ and the negative output terminal VO‑ are both electrically connected to a laser pump source, and the negative output terminal VO‑ is electrically connected to the constant current module; the control mainboard is electrically connected to the switch control module and the PWM modulation module; the present invention has the advantages of strong anti-interference ability, strong compatibility and the like, and can effectively enhance the service life of the fiber laser.

Description

Technical Field

[0001] The invention relates to the technical field of laser pump source driving, and in particular to a fiber laser pump source driver. Background Art

[0002] A laser is a device that generates photons using the principle of stimulated emission. The energy and power of its output beam depends on the size of the injected current. In order to maintain the stability and reliability of the laser output, a constant current module is needed to control the size of the current injected into the laser. Constant current modules have important applications in lasers.

[0003] In the existing similar technologies, the current output is controlled by a voltage signal, and its amplitude corresponds to 0-100% current in the range of 0-2.5V, and the two are in a linear proportional relationship. However, this low-voltage signal has obvious defects in industrial applications: it is easy to produce errors during the transmission process, especially when a high-power load impacts the power supply system, the electrical interference will be easily transmitted to the constant current module. At this time, a small voltage fluctuation will cause the current fluctuation at the constant current output end. This unstable current fluctuation will destroy the constant power output of the laser, thereby shortening its service life; and because the voltage control signal starts to adjust from 0V, sometimes the analog port of the control motherboard cannot output the 0V signal of the constant current module reference ground, which may cause compatibility problems, and the voltage signal of tens of mV may cause the constant current module to generate current output, thereby bringing safety hazards. In addition, the existing technology only has a constant current function, but cannot perform signal modulation on the laser output, so it is impossible to achieve the output of a pulsed laser beam. Summary of the invention

[0004] In view of this, the present invention provides a fiber laser pump source driver that overcomes the above technical problems or at least partially solves the above problems.

[0005] The technical solution adopted by the present invention is:

[0006] A fiber laser pump source driver, the driver comprising a control mainboard, a 5V adjustable power module, a switch control module, a constant current module, an isolation output module and a PWM modulation module electrically connected in sequence, the PWM modulation module having a positive output terminal VO+ and a negative output terminal VO-, the positive output terminal VO+ and the negative output terminal VO- are both electrically connected to a laser pump source, and the negative output terminal VO- is electrically connected to the constant current module; the control mainboard is electrically connected to the switch control module and the PWM modulation module;

[0007] The driver also includes a power supply module, which is electrically connected to the V adjustable power supply module, the switch control module, the constant current module, the isolated output module and the PWM modulation module, and is used to provide power for the V adjustable power supply module, the switch control module, the constant current module, the isolated output module and the PWM modulation module.

[0008] In a specific embodiment, the 5V adjustable power supply module includes:

[0009] Voltage stabilized power supply module, used to generate +5V power supply;

[0010] A negative voltage power supply module, electrically connected to the voltage-stabilized power supply module, for generating a -5V power supply;

[0011] A voltage conversion module, whose input end is electrically connected to the current source, and is used to convert the current signal of the current source into a voltage signal for output;

[0012] A zero adjustment signal module, used as an adjustable reference voltage signal;

[0013] A differential amplifier module, which has two input terminals, the two input terminals of the differential amplifier module are electrically connected to the power conversion module and the zeroing signal module respectively, and is used to compare the voltage signal in the voltage conversion module with the voltage signal of the zeroing signal module and amplify the voltage difference and output it;

[0014] An adjustable amplification module, electrically connected to the differential amplification module, for receiving the voltage signal in the differential amplification module and amplifying and adjusting the voltage signal;

[0015] The zero adjustment signal module is used to make the voltage output range of the output terminal UO of the adjustable amplifier module be 0-5V when adjusting at the zero adjustment point in the zero adjustment signal module.

[0016] In one embodiment, the current value output by the current source ranges from 4 to 20 mA; and the voltage value of the current source is 24 V.

[0017] In one embodiment, the current source is controlled by the control mainboard.

[0018] In one embodiment, the control mainboard is a single chip microcomputer control mainboard.

[0019] In one embodiment, the switch control module is controlled by the control main board, and the switch control module includes a first switch circuit and a second switch circuit electrically connected to each other, and the first switch circuit and the second switch circuit are both electrically connected to the control main board. When the first switch circuit is turned on, the second switch circuit is turned on.

[0020] In one embodiment, the first switch circuit is a triode switch circuit, and the second switch circuit is a MOS switch circuit.

[0021] In one embodiment, the constant current module is composed of a plurality of constant current circuits connected in parallel, and the constant current circuit is a constant current circuit based on a MOS tube and an operational amplifier.

[0022] Compared with the prior art, the fiber laser pump source driver provided by the present invention has the following beneficial effects:

[0023] The 5V adjustable power supply module provided in the present invention can realize the conversion of the current value range of the control current signal from 4-20ma to the voltage output of 0-5V, which effectively solves the obvious defects in the prior art due to the application of the low-voltage signal of 0-2.5V in the fiber laser pump source driver (such as the defects of easy error in signal transmission, weak anti-interference ability, poor compatibility, etc.), has the advantages of strong anti-interference ability and strong compatibility, and can effectively enhance the service life of the fiber laser;

[0024] The present invention is provided with a PWM modulation module, which can realize modulation of the laser signal, thereby realizing the output of a pulsed laser beam, and effectively enhancing the application flexibility and application range of the optical fiber laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a circuit structure block diagram of the fiber laser pump source driver according to an embodiment of the present invention;

[0026] Figure 2 This is a circuit structure block diagram of the 5V adjustable power supply module described in an embodiment of the present invention;

[0027] Figure 3 This is a specific circuit structure diagram of the 5V adjustable power supply module described in an embodiment of the present invention;

[0028] Figure 4 is a specific circuit structure diagram of the switch control module in an embodiment of the present invention;

[0029] Figure 5 is a specific circuit structure diagram of the constant current module described in an embodiment of the present invention;

[0030] Figure 6 is a specific circuit structure diagram of the constant current circuit described in an embodiment of the present invention;

[0031] Figure 7 is a specific circuit structure diagram of the isolated output module described in an embodiment of the present invention;

[0032] Figure 8 is a specific circuit structure diagram of the PWM modulation module in an embodiment of the present invention;

[0033] Fig. 9 is a specific circuit structure diagram of the power supply described in an embodiment of the present invention;

[0034] Fig.10 This is another circuit structure block diagram of the fiber laser pump source driver described in an embodiment of the present invention.

[0035] The figures in the drawings are:

[0036] 10. Control main board; 20. 5V adjustable power supply module; 21. Voltage-stabilized power supply module; 22. Negative voltage power supply module; 23. Current source; 24. Voltage conversion module; 25. Zero adjustment signal module; 26. Differential amplifier module; 27. Adjustable amplifier module; 28. Connection terminal; 30. Switch control module; 31. First switch circuit; 32. Second switch circuit; 33. Third connection terminal; 40. Constant current module; 41. Constant current circuit; 50. Isolation output module; 60. PWM modulation module; 70. Power supply module. DETAILED DESCRIPTION

[0037] In order to better understand the purpose, technical solution and technical effect of the present invention, the present invention is further explained below in conjunction with the accompanying drawings and embodiments. At the same time, it is stated that the embodiments described below are only used to explain the present invention and are not used to limit the present invention.

[0038] Example

[0039] like Figure 1 As shown, a fiber laser pump source driver, the driver includes a control mainboard 10, a 5V adjustable power module 20, a switch control module 30, a constant current module 40, an isolation output module 50 and a PWM modulation module 60 which are electrically connected in sequence, the PWM modulation module having a positive output terminal VO+ and a negative output terminal VO-, the positive output terminal VO+ and the negative output terminal VO- are both electrically connected to the laser pump source, and the negative output terminal VO- is electrically connected to the constant current module; the control mainboard is electrically connected to the switch control module and the PWM modulation module;

[0040] The driver also includes a power supply module 70, which is electrically connected to the 5V adjustable power supply module, the switch control module, the constant current module, the isolated output module and the PWM modulation module, and is used to provide power for the V adjustable power supply module, the switch control module, the constant current module, the isolated output module and the PWM modulation module.

[0041] Among them: the 5V adjustable power supply module is used to provide an adjustable voltage of 0-5V, its input current is greater than 0ma (milliampere) current, and its output voltage is a corresponding 0-5V voltage signal; the PWM modulation module is used to perform pulse width modulation on the output voltage of the isolation output module and then output the voltage.

[0042] In this embodiment, the 5V adjustable power supply module is used to realize the function of converting the corresponding control current signal input to the output voltage of 0-5V (for example, when the input end of the 5V adjustable power supply module receives a certain current signal, the output end of the 5V adjustable power supply module can output a corresponding 0-5V voltage signal), so as to effectively solve the obvious defects of the prior art due to the application of 0-2.5V low-voltage signal in the fiber laser pump source driver (such as signal transmission is prone to errors, weak anti-interference ability, poor compatibility, etc.);

[0043] The PWM modulation module is used to perform pulse width modulation to achieve pulse modulation of the laser pump source, thereby achieving the output of a pulsed laser beam.

[0044] In a specific embodiment, the 5V adjustable power supply module is as shown in the attached Figure 2 As shown, it includes:

[0045] A voltage-stabilized power supply module 21, used to generate a +5V power supply;

[0046] A negative voltage power supply module 22, electrically connected to the voltage-stabilizing power supply module, for generating a -5V power supply;

[0047] A voltage conversion module 24, whose input end is electrically connected to the current source 23, is used to convert the current signal of the current source into a voltage signal for output;

[0048] A zero adjustment signal module 25, used as an adjustable reference voltage signal;

[0049] A differential amplifier module 26, which has two input terminals, the two input terminals of the differential amplifier module are electrically connected to the power conversion module and the zero adjustment signal module respectively, and is used to compare the voltage signal in the voltage conversion module with the voltage signal of the zero adjustment signal module and amplify the voltage difference and output it; wherein the differential amplifier module is also electrically connected to the negative voltage power supply module and the voltage stabilizing power supply module;

[0050] An adjustable amplification module 27, electrically connected to the differential amplification module, for receiving the voltage signal in the differential amplification module and amplifying and adjusting it;

[0051] The zero adjustment signal module is used to make the voltage output range of the output terminal UO of the adjustable amplifier module be 0-5V when adjusting at the zero adjustment point in the zero adjustment signal module.

[0052] In this embodiment, the current source is controlled by the control mainboard, and the control mainboard is preferably a single-chip control mainboard. In order to facilitate connection with other functional circuits, the 5V adjustable power supply module is also provided with a connection terminal 28, and the output terminal UO of the adjustable amplifier module (also the output terminal of the 5V adjustable power supply module) is connected to the connection terminal 28. Figure 2 shown.

[0053] Preferably, the current value range of the current source output is 4-20ma, and the voltage value of the current source is 24V. For example, in a specific application, the power value of the current source is 24V, and the current value of the current signal outputted by the current source is 4-20ma. When the 5V adjustable power supply module receives the current signal of 4-20ma outputted by the current source, its output terminal UO can output a voltage signal of 0-5V correspondingly, thereby effectively solving the obvious defects in the prior art due to the application of 0-2.5V low-voltage signals in the fiber laser pump source driver.

[0054] In a specific embodiment, the specific circuit of the 5V adjustable power supply module is as shown in the attached Figure 3 As shown;

[0055] In this embodiment, the voltage-stabilized power supply module is mainly composed of a voltage-stabilizing chip 78M05, which can output a +5V voltage source after stabilizing the external voltage source through the voltage-stabilizing chip 78M05. The negative voltage power supply module is mainly composed of a 7660 negative voltage chip, which can convert the +5V voltage source output by the voltage-stabilizing chip 78M05 into a -5V voltage source; the voltage conversion module, the zero adjustment signal module, the differential amplifier module and the adjustable amplifier module are mainly composed of an operational amplifier and a number of resistors. In this embodiment, a chip LM324 with four operational amplifiers is selected, and the four operational amplifiers are respectively used as parts of the voltage conversion module, the zero adjustment signal module, the differential amplifier module and the adjustable amplifier module. The specific circuit structure is shown in the attached figure. Figure 3 Attached Figure 3 In the figure, P1 and P2 are connection terminals, which are respectively called the first connection terminal and the second connection terminal in this embodiment; wherein the first connection terminal P1 is used to connect the current source 23, and the second connection terminal P2 is used to connect the external voltage source and the output terminal UO, and the voltage of the external voltage source is 7-32V.

[0056] The circuit working principle of the 5V adjustable power supply module described in this embodiment is:

[0057] The voltage of 7-32V inputted from the external voltage source is outputted as +5V voltage after passing through the voltage-stabilizing power supply module, and then -5V voltage can be obtained through the negative voltage power supply module. The obtained +5V voltage and -5V voltage can provide the corresponding required voltage signal for the chip LM324; the zeroing point of the adjustable resistor RP2 in the zeroing signal module is adjusted, and the voltage after zeroing is inputted into the inverting input terminal of the operational amplifier U1A in the differential amplifier module as a zero-point signal after passing through the operational amplifier U1D; the current signal (current size is 4-20ma) of the current source at the first connection terminal P1 is current-detected, amplified and voltage-converted through a circuit composed of a plurality of resistors and the operational amplifier U1B, thereby realizing the conversion of the input current signal into a voltage signal for output, and the conversion The converted voltage signal is sent to the non-inverting input terminal of the operational amplifier U1A in the differential amplifier module through the voltage divider network composed of the resistor R8 and the resistor R6, and is amplified by the non-inverting phase of the operational amplifier U1A (in this embodiment, it is amplified to twice the original signal). Finally, the voltage signal output by the operational amplifier U1A is output to the connection terminal P2 port through the adjustable amplifier composed of the operational amplifier U1C in the adjustable amplifier module. By adjusting the adjustable resistor RP2 in the zero adjustment signal module and the adjustable resistor RP1 in the adjustable amplifier module, the voltage value output by the output terminal UO in the adjustable amplifier module can be made 0-5V, and finally the function of inputting a 4-20ma current signal at the first connection terminal P1 and converting it into an output 0-5V voltage signal at the connection terminal P2 can be realized.

[0058] In one of the preferred embodiments, the switch control module 30 is controlled by the control main board 10, and the switch control module includes a first switch circuit 31 and a second switch circuit 32 that are electrically connected to each other, and the first switch circuit and the second switch circuit are both electrically connected to the control main board. When the first switch circuit is turned on, the second switch circuit is turned on; preferably, the first switch circuit is a triode switch tube circuit, and the second switch circuit is a MOS tube switch tube circuit.

[0059] In a specific embodiment, the specific circuit structure of the switch control module is as shown in the attached Figure 4 As shown, the first switch circuit is composed of a transistor Q11 and a plurality of resistors and capacitors, and the second switch circuit is composed of a MOS tube Q15 and a plurality of resistors and capacitors; the first switch circuit and the second switch circuit in this embodiment belong to conventional technical means in this technical field or belong to functional modules that can be realized by the prior art in this field, and their specific composition and working principle will not be further described in detail here.

[0060] The switch control module is also provided with a third connection terminal 33 for connecting to the single-chip control mainboard. Figure 4The node UO in is the node connected to the output terminal UO of the 5V adjustable power module, and P3 is the third connection terminal. The corresponding IO port in the single-chip control mainboard is connected to the corresponding pin on the third connection terminal to realize the control of the switch control module and the PWM modulation module.

[0061] Specifically, the pin J5-2 (node ​​VI VERF+) on the third connection terminal is connected to the second switch circuit through the resistor R105, and the pin J5-1 of D on the third connection terminal is connected to the first switch circuit. The IO port of the single-chip microcomputer outputs the corresponding switch signal to realize the control of the first switch circuit and the second switch circuit. The output terminal UO of the 5V adjustable power supply module is connected to the node VI VERF+ (pin J5-2), so the output voltage signal of the 5V adjustable power supply module can also realize the control of the second switch circuit, thereby realizing the control of the switch state of the switch control module, and then realizing the current source output of 4-20ma current signal, which can control the switch control module, and finally realize the current output control of the constant current module and the drive control of the laser pump source.

[0062] In one preferred embodiment, the constant current module 40 is composed of a plurality of constant current circuits 41 connected in parallel, and the constant current circuit is a constant current circuit based on a MOS tube and an operational amplifier. Preferably, the MOS tube is a high-power MOS tube.

[0063] In a specific embodiment, the constant current module 40 is as shown in the attached Figure 5 As shown, it is composed of four constant current circuits 41 arranged in parallel. The constant current circuit is based on a high-power MOS tube and an operational amplifier. The specific circuit structure is shown in the attached Figure 6 The constant current circuit in this embodiment belongs to conventional technical means in the technical field or belongs to a functional module that can be realized by the prior art in the technical field, and its specific working principle will not be further described in detail here.

[0064] The constant current module in this embodiment can effectively increase the power by using a high-power MOS tube and setting multiple constant current circuits in parallel. In addition, the control end of the constant current module is connected to the single-chip control mainboard through a switch control module, so that the output power of the constant current module can be controlled by the single-chip control mainboard.

[0065] The fiber laser pump source driver in the embodiment of the present invention can modulate the laser signal and output a pulsed laser beam by setting multiple constant current circuits based on high-power MOS tubes in parallel and cooperating with a single-chip microcomputer control mainboard and a PWM modulation module, thereby effectively enhancing the application flexibility and scope of the fiber laser.

[0066] In one preferred embodiment, an isolated output module 50 is also provided in this embodiment to isolate the current information output by the constant current module and then transmit it to the PWM modulation module, thereby effectively improving the reliability and safety of the circuit. The specific circuit of the isolated output module in this embodiment is shown in the attached Figure 7 As shown, its specific composition and connection relationship will not be described in detail here.

[0067] In one specific embodiment, the specific circuit of the PWM modulation module is as shown in the attached Figure 8 As shown, Figure 8 The nodes VO+ and VO- in are the positive output terminal VO+ and the negative output terminal VO- of the PWM modulation module, which are used to be connected to the load. The load in this embodiment is a laser pump source. The PWM modulation module in this embodiment belongs to the conventional technical means in this technical field or belongs to a functional module that can be realized by the prior art in this field. Its specific working principle will not be further described in detail here.

[0068] In one specific embodiment, the specific circuit of the power module 70 is as shown in the attached Fig. 9 As shown, the power supply module is used to provide corresponding voltage sources for the 5V adjustable power supply module, the switch control module, the constant current module, the isolated output module and the PWM modulation module. In actual application, power can also be provided for the single-chip control mainboard as needed. The power supply module in this embodiment belongs to conventional technical means in the field of this technology or belongs to a functional module that can be realized by the prior art in this field, and its specific working principle will not be further described here.

[0069] To better understand the attached Figure 3-9 For the connection relationship of each specific circuit in the Fig.10 For example, the output terminal UO of the 5V adjustable power module is connected to the switch control module, the nodes VIVERF+ and VI VERF- of the single-chip control mainboard are electrically connected to the switch control module, and the node VI VERF+ is also electrically connected to the output terminal UO of the 5V adjustable power module, the output terminals CS1, CS2, CS3, and CS4 of the four constant current circuits in the constant current module are respectively connected to the isolation output module, and the output terminal OUT of the isolation output module is connected to the PWM modulation module. For details, please refer to the attached Figure 3-10 , the connection relationship between the functional modules will not be further described here.

[0070] By using the fiber laser pump source driver provided by the embodiment of the present invention and applying it to a fiber laser, the following beneficial technical effects can be obtained:

[0071] (1) It has the advantages of strong anti-interference ability and strong compatibility, and can effectively enhance the service life of fiber lasers;

[0072] (2) The laser signal can be modulated to achieve the output of a pulsed laser beam, effectively enhancing the application flexibility and scope of fiber lasers.

[0073] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the inventive concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fiber laser pump source driver, characterized in that: The driver includes a control mainboard, and also includes a 5V adjustable power module, a switch control module, a constant current module, an isolation output module and a PWM modulation module which are electrically connected in sequence, wherein the PWM modulation module has a positive output terminal VO+ and a negative output terminal VO-, wherein the positive output terminal VO+ and the negative output terminal VO- are both electrically connected to a laser pump source, and the negative output terminal VO- is electrically connected to the constant current module; the control mainboard is electrically connected to the switch control module and the PWM modulation module; The driver also includes a power module, which is electrically connected to the 5V adjustable power module, the switch control module, the constant current module, the isolated output module and the PWM modulation module, and is used to provide power for the 5V adjustable power module, the switch control module, the constant current module, the isolated output module and the PWM modulation module; The 5V adjustable power supply module includes: Voltage stabilized power supply module, used to generate +5V power supply; A negative voltage power supply module, electrically connected to the voltage-stabilized power supply module, for generating a -5V power supply; A voltage conversion module, whose input terminal is electrically connected to the current source, for converting the current signal of the current source into a voltage signal for output; A zero adjustment signal module, used as an adjustable reference voltage signal; A differential amplifier module, which has two input terminals, the two input terminals of the differential amplifier module are electrically connected to the voltage conversion module and the zeroing signal module respectively, and is used to compare the voltage signal in the voltage conversion module with the voltage signal of the zeroing signal module and amplify the voltage difference and output it; An adjustable amplification module, electrically connected to the differential amplification module, for receiving the voltage signal in the differential amplification module and amplifying and adjusting the voltage signal; The zero adjustment signal module is used to make the voltage output range of the output terminal UO of the adjustable amplifier module 0-5V when the zero adjustment point in the zero adjustment signal module is adjusted; The current value range of the current source output is 4-20 mA; The current source is controlled by the control mainboard; The switch control module is controlled by the control main board, and includes a first switch circuit and a second switch circuit electrically connected to each other. The first switch circuit and the second switch circuit are both electrically connected to the control main board. When the first switch circuit is turned on, the second switch circuit is turned on.

2. The fiber laser pump source driver according to claim 1, characterized in that: The voltage value of the current source is 24V.

3. The fiber laser pump source driver according to claim 1, characterized in that: The control main board is a single chip microcomputer control main board.

4. The fiber laser pump source driver according to claim 1, characterized in that: The first switch circuit is a triode switch circuit, and the second switch circuit is a MOS switch circuit.

5. The fiber laser pump source driver according to claim 1, characterized in that: The constant current module is composed of a plurality of constant current circuits arranged in parallel, and the constant current circuit is a constant current circuit based on a MOS tube and an operational amplifier.

6. The fiber laser pump source driver according to claim 4, characterized in that: The constant current module is composed of four constant current circuits arranged in parallel.

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