Laser pumping source driving circuit

Abstract

The utility model provides a laser pumping source driving circuit. The laser pumping source driving circuit comprises a pumping source load; at least two groups or more than two groups of power amplification units, each group of power amplification units is respectively connected with the pumping source load, and the power amplification units are used for amplifying current flowing to the pumping source load; each group of power amplification units is connected with the corresponding driving unit, and the driving units are used for driving the power amplification units; wherein each group of driving units is respectively connected with a pull-up voltage. It can be seen that the laser pumping source driving circuit can eliminate the step of the current rising edge of the laser pumping source, and the laser processing quality is guaranteed.

Description

Technical Field

[0001] The present application belongs to the field of laser technology, and more specifically, relates to a laser pump source driving circuit. Background Art

[0002] At present, the laser power of high-power continuous lasers is getting higher and higher, and the constant current source current required to drive the laser pump source (LD) is getting larger and larger. The traditional constant current source uses a single drive unit to drive multiple parallel MOS tubes. However, due to differences in semiconductor device process levels, the on-resistance of MOS tubes is inconsistent, and the current flowing through each MOS tube is uneven, which will cause the MOS tube to overheat and damage. Therefore, it is necessary to use a MOS tube current-sharing parallel circuit to make the total main current flow evenly through each MOS tube.

[0003] However, due to the differences in parameters of MOS tubes and driving circuit components, as well as the influence of parasitic parameters caused by circuit board layout and wiring, there will be certain differences in the feedback loop signals of the driving unit corresponding to each MOS tube, and the size of the signal output from the driving unit to the gate of the MOS tube will be inconsistent. When the PWM signal is input to the driving unit, the rising edge of the laser pump source current will form a step, which will lead to poor processing quality when performing more precise laser welding and other processes. Utility Model Content

[0004] The present application provides a laser pump source driving circuit capable of eliminating the step on the rising edge of the pump source current.

[0005] The technical solution adopted in this application is a laser pump source driving circuit, comprising:

[0006] Pump source load;

[0007] At least two or more groups of power amplifying units, each group of the power amplifying units is connected to the pump source load respectively, and the power amplifying units are used to amplify the current flowing to the pump source load; and

[0008] A driving unit, each group of the power amplifying units is respectively connected to the driving unit, and the driving unit is used to drive the power amplifying unit; wherein,

[0009] Each group of the driving units is respectively connected to a pull-up voltage.

[0010] It can be seen that the laser pump source driving circuit of the present application includes two or more groups of power amplification units, and the power amplification units are respectively connected to the pump source loads, so that the current driving the pump source becomes larger, and can drive a high-power laser pump source.

[0011] In addition, each group of power amplification units is respectively connected to a group of driving units, and each group of driving units is respectively connected to a pull-up voltage. The pull-up voltage can provide a preset voltage for the driving unit, so that the output voltage of each driving unit can be kept consistent, and then the initial voltage of each power amplification unit can be made consistent, thereby eliminating the step on the rising edge of the laser pump source current when the PWM signal is input into the driving unit, thereby ensuring the quality of laser processing.

[0012] Optionally, the driving unit comprises an amplifier, an output end of the amplifier is connected to the amplifier, and a non-inverting input end of the amplifier is connected to the pull-up voltage.

[0013] Optionally, the driving unit further includes a first resistor, and the first resistor is connected between the pull-up voltage and the non-inverting input terminal of the amplifier.

[0014] Optionally, the driving unit further includes a second resistor, one end of the second resistor is connected to the non-inverting input end of the amplifier, and the other end of the second resistor is grounded.

[0015] Optionally, a control unit is further included, and the control unit is connected to the driving unit respectively, and the control unit is used to output an analog signal to the driving unit.

[0016] Optionally, the control unit is a DA conversion circuit, and the output end of the DA conversion circuit is connected to the in-phase input end of the amplifier.

[0017] Optionally, the driving unit further includes a third resistor, and the third resistor is connected between the non-inverting input terminal of the amplifier and the output terminal of the control unit.

[0018] Optionally, the power amplification unit includes a MOS tube, a gate of the MOS tube is connected to the output end of the amplifier, a source of the MOS tube is connected to the inverting input end of the amplifier, and a drain of the MOS tube is connected to the pump source.

[0019] Optionally, the driving unit further includes a fourth resistor, and the fourth resistor is connected between the inverting input terminal of the amplifier and the source of the MOS tube;

[0020] The driving unit further includes a fifth resistor, and the fifth resistor is connected between the output end of the amplifier and the gate of the MOS tube; and

[0021] The power amplification unit further comprises a sampling resistor, one end of which is respectively connected to the source of the MOS tube and one end of a fourth resistor away from the amplifier, and the other end of the sampling resistor is grounded.

[0022] Optionally, the positive electrode of the pump source is connected to a load supply voltage, and the negative electrode of the pump source is connected to the drain of each of the MOS tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of the structure of a laser pump source driving circuit provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1 A circuit schematic diagram of a laser pump source driving circuit provided in an embodiment.

[0026] Reference numerals:

[0027] 100, power amplification unit; 200, driving unit; 300, pump source; 400, pull-up voltage; 500, control unit. Specific embodiments

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when a metastructure is referred to as being "fixed to" or "set on" another metastructure, it can be directly on the other metastructure or indirectly on the other metastructure. When a metastructure is referred to as being "connected to" another metastructure, it can be directly connected to the other metastructure or indirectly connected to the other metastructure.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element structure referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of some applications, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] See also Figure 1 The present application provides a laser pump source driving circuit, including a pump source 300 load, a power amplification unit 100 and a driving unit 200.

[0033] There are at least two or more power amplification units 100, and the number can be selected according to actual applications and is not specifically limited here.

[0034] Each group of power amplification units 100 is connected to a pump source 300 load, and the power amplification unit 100 is used to amplify the current flowing to the load of the pump source 300. The pump source 300 is a laser pump source 300.

[0035] It can be understood that, since there are at least two or more groups of power amplification units 100 , multiple groups of power amplification units 100 can be used to evenly distribute the current flowing through the load of the pump source 300 .

[0036] Each group of power amplifying units 100 is respectively connected to a driving unit 200 , and the driving unit 200 is used to drive the power amplifying units 100 , so that each power amplifying unit 100 can provide a constant current source to the pump source 300 .

[0037] Furthermore, each group of driving units 200 is respectively connected to a pull-up voltage 400 .

[0038] Specifically, since there are at least two or more groups of power amplification units 100, and each power amplification unit 100 is respectively connected to a driving unit 200, when each group of driving units 200 is respectively connected to a pull-up voltage 400, each pull-up voltage 400 can provide a preset voltage for the driving unit 200, so that the output voltage of each driving unit 200 can be kept consistent, and then the initial voltage of each power amplification unit 100 can be made consistent, thereby eliminating the step on the rising edge of the current of the laser pump source 300 when the PWM signal is input into the driving unit 200, thereby ensuring the quality of laser processing.

[0039] It can be seen that the laser pump source 300 driving circuit of the present application includes two or more groups of power amplification units 100, and the power amplification units 100 are respectively connected to the pump source 300 load, so that the current driving the pump source 300 becomes larger, and can drive a high-power laser pump source 300.

[0040] In addition, each group of power amplification units 100 is respectively connected to a group of driving units 200, and each group of driving units 200 is respectively connected to a pull-up voltage 400. The pull-up voltage 400 can provide a preset voltage for the driving unit 200, so that the output voltage of each driving unit 200 can be kept consistent, and then the initial voltage of each power amplification unit 100 can be made consistent, thereby eliminating the step of the rising edge of the current of the laser pump source 300 when the PWM signal is input into the driving unit 200, thereby ensuring the quality of laser processing.

[0041] See also Figure 2 In some embodiments, the driving unit 200 includes an amplifier, an output end of the amplifier is connected to the pump source 300 load, an output end of the amplifier is connected to the amplifier, and a non-inverting input end of the amplifier is connected to the pull-up voltage 400.

[0042] It can be understood that the pull-up voltage 400 provides a preset voltage for the amplifier, so that the output voltage of each amplifier remains consistent, thereby ensuring that the initial voltage of the power amplification unit 100 is consistent.

[0043] Furthermore, in some embodiments, the driving unit 200 may further include a first resistor, and the first resistor is connected between the pull-up voltage 400 and the non-inverting input terminal of the amplifier. The first resistor plays a role of voltage division for the pull-up voltage 400.

[0044] Specifically, one end of the first resistor is connected to the pull-up voltage 400 , and the other end of the first resistor is connected to the non-inverting input terminal of the amplifier.

[0045] Furthermore, in some embodiments, the driving unit 200 further includes a second resistor, one end of the second resistor is connected to the in-phase input terminal of the amplifier, and the other end of the second resistor is grounded. The second resistor plays a role of voltage division.

[0046] See also Figure 1 The laser pump source driving circuit may further include a control unit 500 , wherein the control unit 500 is respectively connected to the driving unit 200 , and the control unit 500 is used to output an analog signal to the driving unit 200 .

[0047] Specifically, the control unit 500 outputs an analog signal to the amplifier so that the amplifier can drive the power amplification unit 100 .

[0048] See also Figure 2 In some implementations, the control unit 500 may be a DA conversion circuit, and the output end of the DA conversion circuit is connected to the in-phase input end of the amplifier.

[0049] Specifically, the DA conversion circuit is used to convert a digital signal into an analog signal.

[0050] Furthermore, the driving unit 200 may further include a third resistor, and the third resistor is connected between the in-phase input terminal of the amplifier and the output terminal of the control unit 500. It can be understood that the third resistor and the second resistor cooperate to divide the voltage to control the magnitude of the amplifier input voltage.

[0051] Specifically, one end of the third resistor is connected to the non-inverting input terminal of the amplifier, and the other end of the third resistor is connected to the output terminal of the control unit 500 .

[0052] See also Figure 2 In some embodiments, the power amplification unit 100 includes a MOS tube, a gate of the MOS tube is connected to the output end of the amplifier, a source of the MOS tube is connected to the inverting input end of the amplifier, and a drain of the MOS tube is connected to the pump source 300 .

[0053] Furthermore, the driving unit 200 may further include a fourth resistor, and the fourth resistor is connected between the inverting input terminal of the amplifier and the source of the MOS tube.

[0054] Specifically, one end of the fourth resistor is connected to the inverting input end of the amplifier, and the other end of the fourth circuit is connected to the source of the MOS tube.

[0055] The driving unit 200 may further include a fifth resistor, and the fifth resistor is connected between the output end of the amplifier and the gate of the MOS tube.

[0056] Specifically, one end of the fifth resistor is connected to the output end of the amplifier, and the other end of the fifth resistor is connected to the gate of the MOS tube.

[0057] The power amplifying unit 100 may further include a sampling resistor, one end of which is respectively connected to the source of the MOS tube and one end of the fourth resistor away from the amplifier, and the other end of the sampling resistor is grounded.

[0058] In addition, the positive electrode of the pump source 300 can be connected to the load supply voltage, and the negative electrode of the pump source 300 is connected to the drain of each MOS tube respectively.

[0059] See also Figure 2 , taking providing two sets of power amplification units 100 and pump source 300 load connection as an example.

[0060] The laser pump source driving circuit includes a pump source LD, a MOS tube Q1, a MOS tube Q2, an amplifier U1A, an amplifier U1B and a control unit DA.

[0061] The non-inverting input terminal of the amplifier U1A is connected to the pull-up voltage VCC1 , and a first resistor R1 is disposed and connected between the non-inverting input terminal of the amplifier U1A and the pull-up voltage VCC1 .

[0062] The non-inverting input terminal of the amplifier U1B is connected to the pull-up voltage VCC2 , and a first resistor R6 is disposed and connected between the non-inverting input terminal of the amplifier U1B and the pull-up voltage VCC2 .

[0063] Furthermore, the non-inverting input terminal of the amplifier U1A is also connected to one end of the second resistor R4, and the other end of the second resistor R4 is grounded.

[0064] The non-inverting input terminal of the amplifier U1B is also connected to one end of the second resistor R9, and the other end of the second resistor R9 is grounded.

[0065] The control unit DA is connected to the non-inverting input terminal of the amplifier U1A and the non-inverting input terminal of the amplifier U1B respectively, and provides analog signals to the amplifier U1A and the amplifier U1B.

[0066] Furthermore, a third resistor R3 is connected between the control unit DA and the non-inverting input terminal of the amplifier U1A, and a third resistor R8 is connected between the control unit DA and the non-inverting input terminal of the amplifier U1B.

[0067] The gate of the MOS transistor Q1 is connected to the output end of the amplifier UIA, and a fifth resistor R5 is further connected between the gate of the MOS transistor Q1 and the output end of the amplifier UIA.

[0068] The gate of the MOS transistor Q2 is connected to the output end of the amplifier UIB, and a fifth resistor R10 is further connected between the gate of the MOS transistor Q2 and the output end of the amplifier UIB.

[0069] The source of the MOS transistor Q1 is connected to the inverting input terminal of the amplifier U1A, and a fourth resistor R2 is also connected between the source of the MOS transistor Q1 and the inverting input terminal of the amplifier U1A.

[0070] The source of the MOS transistor Q2 is connected to the inverting input terminal of the amplifier U1B, and a fourth resistor R7 is also connected between the source of the MOS transistor Q2 and the inverting input terminal of the amplifier U1B.

[0071] The drain of the MOS transistor Q1 and the drain of the MOS transistor Q2 are connected to the pump source LD respectively.

[0072] Furthermore, the source of the MOS tube Q1 and one end of the fourth resistor R2 away from the amplifier U1A are also connected to one end of the sampling resistor RS1 respectively, and the other end of the sampling resistor RS1 is grounded.

[0073] The source of the MOS tube Q2 and one end of the fourth resistor R7 away from the amplifier U1B are also connected to one end of the sampling resistor RS2 respectively, and the other end of the sampling resistor RS2 is connected.

[0074] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of some applications should be included in the protection scope of some applications.

Claims

1. A laser pump source driving circuit, characterized in that: include: Pump source load; At least two or more groups of power amplification units, each group of the power amplification units is connected to the pump source load respectively, and the power amplification units are used to amplify the current flowing to the pump source load; as well as A driving unit, each group of the power amplifying units is respectively connected to the driving unit, and the driving unit is used to drive the power amplifying unit; wherein, Each group of the driving units is respectively connected to a pull-up voltage.

2. The laser pump source driving circuit according to claim 1, characterized in that: The driving unit comprises an amplifier, an output end of the amplifier is connected to the amplifier, and a non-inverting input end of the amplifier is connected to the pull-up voltage.

3. The laser pump source driving circuit according to claim 2, characterized in that: The driving unit further includes a first resistor, and the first resistor is connected between the pull-up voltage and the non-inverting input terminal of the amplifier.

4. The laser pump source driving circuit according to claim 2, characterized in that: The driving unit further includes a second resistor, one end of the second resistor is connected to the non-inverting input end of the amplifier, and the other end of the second resistor is grounded.

5. The laser pump source driving circuit according to claim 2, characterized in that: It also includes a control unit, which is connected to the driving units respectively, and is used to output analog signals to the driving units.

6. The laser pump source driving circuit according to claim 5, characterized in that: The control unit is a DA conversion circuit, and the output end of the DA conversion circuit is connected to the in-phase input end of the amplifier.

7. The laser pump source driving circuit according to claim 6, characterized in that: The driving unit further includes a third resistor, and the third resistor is connected between the non-inverting input terminal of the amplifier and the output terminal of the control unit.

8. The laser pump source driving circuit according to claim 2, characterized in that: The power amplification unit comprises a MOS tube, a gate of the MOS tube is connected to the output end of the amplifier, a source of the MOS tube is connected to the inverting input end of the amplifier, and a drain of the MOS tube is connected to the pump source.

9. The laser pump source driving circuit according to claim 8, characterized in that: The driving unit further includes a fourth resistor, and the fourth resistor is connected between the inverting input terminal of the amplifier and the source of the MOS tube; The driving unit further includes a fifth resistor, and the fifth resistor is connected between the output end of the amplifier and the gate of the MOS tube; and The power amplification unit further comprises a sampling resistor, one end of which is respectively connected to the source of the MOS tube and one end of a fourth resistor away from the amplifier, and the other end of the sampling resistor is grounded.

10. The laser pump source driving circuit according to claim 8, characterized in that: The positive electrode of the pump source is connected to the load supply voltage, and the negative electrode of the pump source is connected to the drain of each of the MOS tubes.

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