Front edge compensation circuit and semiconductor pump light source

Abstract

The utility model provides a leading edge compensation circuit and a semiconductor pump light source. The leading edge compensation circuit comprises an energy storage unit and a synchronous control unit which are connected in sequence, the synchronous control unit is connected with an external pulse current generation circuit; the synchronous control unit is connected with an external laser diode array; the energy storage unit is used for storing electric energy; and the synchronous control unit is used for being closed when receiving the square wave driving signal sent by the pulse current generation circuit, so that the energy storage unit is connected with the laser diode array, and the energy storage unit performs leading edge compensation on the square wave pulse current output by the pulse current generation circuit. In the mode, by arranging the leading edge compensation circuit, a fast pulse current rising edge can be obtained on the premise that the stability of the pulse current is guaranteed, so that the technical problem that the stability of the pulse current of an existing pulse power supply is poor is solved, the stability of the pulse current is improved, and therefore the performance of the semiconductor pump light source is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulse power supply, in particular to a leading edge compensation circuit and a semiconductor pump light source. Background Art

[0002] The existing pulse power supply based on the laser diode array generally adopts the "current closed loop" working mode. Its load is generally a high-power secondary pump light source, and its output pulse is generally between 150μs and 400μs. In order to ensure the pumping efficiency of the above-mentioned high-power secondary pump light source, the driving pulse of the above-mentioned pulse power supply is required to have a faster rise and fall edge, generally around 20μs to 50μs, and the output pulse current value is generally between 200A and 500A, or even larger. For the laser diode array of the above-mentioned pulse power supply, in order to ensure the stability of the output pulse current, it is impossible to have a too fast pulse rise, but a too slow pulse rise will increase the response time of the laser diode array, thereby affecting the overall performance. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a leading-edge compensation circuit and a semiconductor pump light source, which can obtain a faster pulse current rising edge while ensuring the stability of the pulse current, so as to alleviate the technical problem of poor pulse current stability in the existing pulse power supply, improve the stability of the pulse current, and thus improve the performance of the semiconductor pump light source.

[0004] In the first aspect, an embodiment of the utility model provides a leading edge compensation circuit, comprising: an energy storage unit and a synchronization control unit connected in sequence; the synchronization control unit is connected to a pulse current generating circuit of an external device; the synchronization control unit is connected to a laser diode array of an external device; an energy storage unit for storing electrical energy; and a synchronization control unit for closing upon receiving a square wave drive signal sent by the pulse current generating circuit to connect the energy storage unit to the laser diode array, so that the energy storage unit performs leading edge compensation on the square wave pulse current output by the pulse current generating circuit.

[0005] Furthermore, a current limiting unit is provided between the energy storage unit and the synchronous control unit; the current limiting unit is used to limit the current of the leading edge compensation circuit.

[0006] Furthermore, the synchronous control unit includes a first IGBT switch; the gate of the first IGBT switch is connected to the pulse current generating circuit; the emitter of the first IGBT switch is connected to the anode of the laser diode array; and the collector of the first IGBT switch is connected to the current limiting unit.

[0007] Furthermore, the leading edge compensation circuit also includes a first diode; the emitter of the first IGBT switch intersects with the first end of the first diode; and the second end of the first diode is connected to the laser diode array.

[0008] Furthermore, the leading edge compensation circuit also includes a second diode; the emitter of the first IGBT switch, the first end of the first diode and the first end of the second diode intersect; and the second end of the second diode is grounded.

[0009] Furthermore, the leading edge compensation circuit also includes a charging unit; the charging unit is connected to the energy storage unit; the charging unit is used to provide electrical energy to the energy storage unit so that the energy storage unit stores electrical energy.

[0010] Furthermore, the energy storage unit is an energy storage capacitor.

[0011] Furthermore, the current limiting unit is an inductor.

[0012] In a second aspect, an embodiment of the utility model provides a semiconductor pump light source, including a pulse current generating circuit and a laser diode array, and also including the above-mentioned leading edge compensation circuit; the leading edge compensation circuit is connected to the pulse current generating circuit and the laser diode array respectively.

[0013] Furthermore, it also includes a shell; the pulse current generating circuit, the laser diode array and the leading edge compensation circuit are all arranged in the shell.

[0014] The embodiment of the utility model provides a leading edge compensation circuit and a semiconductor pump light source, including: an energy storage unit and a synchronous control unit connected in sequence; the synchronous control unit is connected to a pulse current generating circuit of an external device; the synchronous control unit is connected to a laser diode array of an external device; the energy storage unit is used to store electric energy; the synchronous control unit is used to close when receiving a square wave driving signal sent by the pulse current generating circuit, so that the energy storage unit is connected to the laser diode array, so that the energy storage unit performs leading edge compensation on the square wave pulse current output by the pulse current generating circuit. In this method, by setting a leading edge compensation circuit, the technical problem of poor pulse current stability in the existing pulse power supply can be alleviated, the stability of the pulse current can be improved, and thus the performance of the semiconductor pump light source can be improved.

[0015] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a laser diode array pulse power supply in a current closed-loop working mode provided by an embodiment of the utility model;

[0019] Figure 2 An oscilloscope provided in an embodiment of the utility model shows a waveform of a pulse current changing with time, which pays more attention to the steady current performance;

[0020] Figure 3 An oscilloscope provided in an embodiment of the utility model displays a waveform of a pulse current changing with time with a focus on the rising edge speed of the pulse current;

[0021] Figure 4 A schematic diagram of the structure of a passive linear output mode laser diode array pulse power supply provided by an embodiment of the utility model;

[0022] Figure 5 A schematic diagram of a leading edge compensation circuit provided in Embodiment 1 of the present utility model;

[0023] Figure 6 A schematic diagram of a laser diode array pulse power supply in a current closed-loop working mode including a leading-edge compensation circuit provided in the second embodiment of the present utility model;

[0024] Figure 7 An oscilloscope provided in an embodiment of the utility model shows a waveform of a pulse current changing with time after being compensated by a leading edge compensation circuit;

[0025] Figure 8 A schematic diagram of a passive linear output mode laser diode array pulse power supply including a leading edge compensation circuit provided in Embodiment 3 of the present utility model;

[0026] Fig. 9 This is a schematic diagram of a semiconductor pump light source provided in Embodiment 4 of the present utility model.

[0027] Icons: 1-current closed-loop charging unit; C1-sampling resistor; IGBT2-second IGBT switch; 2-current closed-loop energy storage unit; 3-laser diode array; 4-passive mode charging unit; 5-passive mode energy storage unit; IGBT3-third IGBT switch; 6-energy storage unit; 7-synchronous control unit; C2-energy storage capacitor; IGBT1-first IGBT switch; 8-charging unit; L1-inductor; D1-first diode; D2-second diode; 9-pulse current generation circuit; 10-front compensation circuit. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] At present, the traditional pulse power supply is generally a laser diode array pulse power supply in a current closed-loop working mode. For ease of understanding, Figure 1 This is a schematic diagram of the structure of a laser diode array pulse power supply in a current closed-loop working mode provided by an embodiment of the utility model. Figure 1 As can be seen, the current closed-loop working mode laser diode array pulse power supply includes: a second IGBT switch IGBT2, a current closed-loop charging unit 1, a sampling resistor C1, a second IGBT switch IGBT2, a current closed-loop energy storage unit 2 and a laser diode array 3 connected in series; the collector of the second IGBT switch IGBT2 is connected to the current closed-loop charging unit 1; the emitter of the second IGBT switch IGBT2, one end of the current closed-loop energy storage unit 2 and the anode of the laser diode array 3 intersect; the current closed-loop charging unit 1 is connected to the cathode of the laser diode array 3; the other end of the current closed-loop energy storage unit 2 is connected to the cathode of the laser diode array 3.

[0030] In actual operation, the load of this pulse power supply is mostly used as a high-power secondary pump light source. Its output pulse width is generally between 150μs and 400μs. In order to ensure the pumping efficiency, the driving pulse is required to have a faster rise and fall edge, generally around 20μs to 50μs, and the output pulse current value is generally between 200A and 500A, or even larger. Figure 2 The waveform of the pulse current changing with time which pays more attention to the steady current performance is displayed by an oscilloscope provided in the embodiment of the utility model, referring to Figure 2 , the rising edge of the pulse current in the figure is slow.

[0031] Figure 3 The utility model provides an oscilloscope display of the pulse current waveform over time, which focuses on the pulse current rising edge speed. For the laser diode array, stable pulse current is the basic requirement to ensure its reliable and safe operation, especially under the premise of large current. For the laser diode array pulse power supply in the current closed-loop working mode, to ensure the stability of the pulse current, there must not be too fast pulse rise. If the response time is too fast, such as Figure 3 , the pulse front edge will be improved, but the front edge current overshoot and stability deterioration are prone to occur.

[0032] Figure 4 The structure diagram of a passive linear output mode laser diode array pulse power supply provided by the embodiment of the utility model. Figure 4 As shown, the passive linear output mode laser diode array pulse power supply comprises a passive mode charging unit 4, a passive mode energy storage unit 5, a third IGBT switch IGBT3 and a laser diode array 3 connected in sequence. Among them, the collector of the third IGBT switch IGBT3 is connected to the passive mode energy storage unit 5, the emitter of the third IGBT switch IGBT3 is connected to the laser diode array 3, and the gate of the third IGBT switch IGBT3 is grounded.

[0033] The passive linear output mode laser diode array pulse power supply has a simple structure and stable performance. It reduces the probability of pulse current out of control to zero, and maximizes the safety of laser diode array pulse use. However, there is a natural shortcoming behind the safety of the passive linear output mode laser diode array pulse power supply, namely: the limited energy storage voltage of the linear output network causes the rising edge of the pulse current to be relatively slow, such as Figure 2 The slow growth of the pulse front will increase the response time of the laser diode array, thus affecting the overall performance.

[0034] Based on this, an embodiment of the utility model provides a leading edge compensation circuit and a semiconductor pump light source. By setting up the leading edge compensation circuit, a faster pulse current rising edge can be obtained while ensuring the stability of the pulse current, so as to alleviate the technical problem of poor pulse current stability in the existing pulse power supply, improve the stability of the pulse current, and thus improve the performance of the semiconductor pump light source.

[0035] To facilitate understanding of this embodiment, the embodiment of the utility model is described in detail below.

[0036] Embodiment 1:

[0037] Figure 5 This is a schematic diagram of a leading edge compensation circuit provided in Embodiment 1 of the present utility model.

[0038] Reference Figure 5 , the leading edge compensation circuit comprises: an energy storage unit 6 and a synchronous control unit 7 connected in sequence; the synchronous control unit 7 is connected to a pulse current generating circuit of an external device; the synchronous control unit 7 is connected to a laser diode array 3 of an external device;

[0039] The energy storage unit 6 is used to store electrical energy.

[0040] Here, the energy storage unit 6 is the energy storage capacitor C2.

[0041] In one embodiment, referring to Figure 5 The leading edge compensation circuit also includes a charging unit 8 ; the charging unit 8 is connected to the energy storage unit 6 .

[0042] The charging unit 8 is used to provide electrical energy to the energy storage unit 6 so that the energy storage unit 6 stores electrical energy.

[0043] Here, the charging unit 8 is commercial power.

[0044] The synchronous control unit 7 is used to close when receiving the square wave driving signal sent by the pulse current generating circuit, so that the energy storage unit 6 is connected to the laser diode array 3, so that the energy storage unit 6 performs leading edge compensation on the square wave pulse current output by the pulse current generating circuit.

[0045] In one embodiment, the synchronization control unit 7 comprises a first IGBT switch IGBT1.

[0046] The gate of the first IGBT switch IGBT1 is connected to the pulse current generating circuit; the emitter of the first IGBT switch IGBT1 is connected to the anode of the laser diode array 3; and the collector of the first IGBT switch IGBT1 is connected to the current limiting unit.

[0047] In one embodiment, referring to Figure 5 A limited current unit is set between the energy storage unit 6 and the synchronization control unit 7.

[0048] The current limiting unit is used to limit the current of the leading edge compensation circuit.

[0049] Here, the current limiting unit is an inductor L1 . The collector of the first IGBT switch IGBT1 is connected to one end of the inductor L1 , and the other end of the inductor L1 is connected to the anode of the laser diode array 3 .

[0050] In one embodiment, referring to Figure 5 , the leading edge compensation circuit also includes a first diode D1.

[0051] The emitter of the first IGBT switch IGBT1 intersects with the first end of the first diode D1 ; the second end of the first diode D1 is connected to the laser diode array 3 .

[0052] In one embodiment, referring to Figure 5 , the leading edge compensation circuit also includes a second diode D2.

[0053] The emitter of the first IGBT switch IGBT1, the first end of the first diode D1 and the first end of the second diode D2 intersect; the second end of the second diode D2 is grounded.

[0054] Specifically, the first diode D1 is used to provide a high voltage when the first IGBT switch IGBT1 is turned off, so as to isolate the leading edge boosting circuit from the laser diode array 3. The second diode D2 is used for freewheeling.

[0055] The embodiment of the utility model provides a leading edge compensation circuit, including: an energy storage unit and a synchronous control unit connected in sequence; the synchronous control unit is connected to the pulse current generating circuit of the peripheral device; the synchronous control unit is connected to the laser diode array of the peripheral device; the energy storage unit is used to store electric energy; the synchronous control unit is used to close when receiving the square wave driving signal sent by the pulse current generating circuit, so that the energy storage unit is connected to the laser diode array, so that the energy storage unit performs leading edge compensation on the square wave pulse current output by the pulse current generating circuit. In this way, by setting the leading edge compensation circuit, a faster pulse current rising edge can be obtained under the premise of ensuring the stability of the pulse current, so as to alleviate the technical problem of poor pulse current stability in the existing pulse power supply, improve the stability of the pulse current, and thus improve the performance of the semiconductor pump light source.

[0056] Embodiment 2:

[0057] Figure 6 This is a schematic diagram of a laser diode array pulse power supply in a current closed-loop working mode including a leading-edge compensation circuit provided in the second embodiment of the present utility model.

[0058] Reference Figure 6 , the leading edge compensation circuit mentioned above is Figure 1 The laser diode array is connected to a pulse power supply in the current closed-loop operation mode.

[0059] The gate of IGBT1 in the leading edge compensation circuit is connected to the gate of IGBT2 in the laser diode array pulse power supply in the current closed-loop working mode, and both are connected to the peripheral driving square wave output device, and the driving square wave output device is used to output a square wave driving signal with a preset width and a preset amplitude; IGBT1 and IGBT2 synchronously respond to the square wave driving signal and are closed at the same time, and the current closed-loop energy storage unit 2 and the energy storage unit 6 are simultaneously connected to the laser diode array 3, so as to perform leading edge compensation on the square wave pulse current output by the current closed-loop energy storage unit 2 through the energy storage unit 6, and obtain the following Figure 7The compensated pulse current shown in the figure makes the pulse current output by the laser diode array pulse power supply in the current closed loop working mode be Figure 2 becomes Figure 7 The pulse current with a slower rising edge is effectively compensated, providing the necessary adjustment space for improving the stability of the main pulse current.

[0060] The embodiment of the utility model provides a laser diode array pulse power supply in a current closed-loop working mode including a leading-edge compensation circuit. By setting up the leading-edge compensation circuit, the technical problem of poor pulse current stability in the existing pulse power supply can be alleviated, the stability of the pulse current can be improved, and thus the performance of the semiconductor pump light source can be improved.

[0061] Embodiment three:

[0062] Figure 8 This is a schematic diagram of a passive linear output mode laser diode array pulse power supply including a leading edge compensation circuit provided in Example 3 of the utility model.

[0063] Reference Figure 8 , the leading edge compensation circuit mentioned above is Figure 4 The laser diode array in passive linear output mode is connected to a pulse power supply.

[0064] The gate of IGBT1 in the leading edge compensation circuit is connected to the gate of IGBT3 in the passive linear output mode laser diode array pulse power supply, and both are connected to the peripheral driving square wave output device, which is used to output a square wave driving signal with a preset width and a preset amplitude; IGBT1 and IGBT3 respond to the square wave driving signal synchronously and close at the same time. When IGBT3 is closed, the passive mode energy storage unit 5 generates a square wave pulse current, and sends the square wave pulse current compensated by the energy storage unit 6 of the leading edge compensation circuit to the laser diode array 3. Figure 7 The compensated pulse current shown in the figure makes the pulse current output by the passive linear output mode laser diode array pulse power supply be Figure 2 becomes Figure 7 The pulse current with a slower rising edge is effectively compensated, providing the necessary adjustment space for improving the stability of the main pulse current.

[0065] The embodiment of the utility model provides a passive linear output mode laser diode array pulse power supply including a leading edge compensation circuit. By setting up the leading edge compensation circuit, the technical problem of slow pulse current rise in the existing passive linear output mode laser diode array pulse power supply can be improved, the stability of the pulse current can be improved, and thus the performance of the semiconductor pump light source can be improved.

[0066] Embodiment 4:

[0067] Fig. 9 This is a schematic diagram of a semiconductor pump light source provided in Embodiment 4 of the present utility model.

[0068] Reference Fig. 9 The semiconductor pump light source includes a pulse current generating circuit 9 and a laser diode array 3, and also includes the above-mentioned leading edge compensation circuit 10; the leading edge compensation circuit 10 is connected to the pulse current generating circuit 9 and the laser diode array 3 respectively.

[0069] In one embodiment, it further comprises a housing; the pulse current generating circuit 9, the laser diode array 3 and the leading edge compensation circuit 10 are all arranged in the housing.

[0070] Here, the pulse current generating circuit 9 may be a laser diode array pulse power supply circuit in a current closed-loop operation mode, or may be a laser diode array pulse power supply circuit in a passive linear output mode.

[0071] The embodiment of the utility model provides a semiconductor pump light source. By setting a leading edge compensation circuit, a faster pulse current rising edge can be obtained under the premise of ensuring the stability of the pulse current. The technical problem of poor pulse current stability in the existing pulse power supply can be alleviated, and the stability of the pulse current can be improved, thereby improving the performance of the semiconductor pump light source.

[0072] The computer program product provided in the embodiment of the utility model includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0073] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0074] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the utility model can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the utility model. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0076] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0077] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A leading edge compensation circuit, characterized in that: include: An energy storage unit and a synchronous control unit connected in sequence; the synchronous control unit is connected to a pulse current generating circuit of an external device; the synchronous control unit is connected to a laser diode array of an external device; The energy storage unit is used to store electrical energy; The synchronization control unit is used to close when receiving the square wave driving signal sent by the pulse current generating circuit, so that the energy storage unit is connected to the laser diode array, so that the energy storage unit performs leading edge compensation on the square wave pulse current output by the pulse current generating circuit.

2. The leading edge compensation circuit according to claim 1, characterized in that: A limited current unit is arranged between the energy storage unit and the synchronization control unit; The current limiting unit is used to limit the current of the leading edge compensation circuit.

3. The leading edge compensation circuit according to claim 2, characterized in that: The synchronous control unit includes a first IGBT switch; The gate of the first IGBT switch is connected to the pulse current generating circuit; the emitter of the first IGBT switch is connected to the anode of the laser diode array; and the collector of the first IGBT switch is connected to the current limiting unit.

4. The leading edge compensation circuit according to claim 3, characterized in that: The leading edge compensation circuit also includes a first diode; The emitter of the first IGBT switch intersects with the first end of the first diode; the second end of the first diode is connected to the laser diode array.

5. The leading edge compensation circuit according to claim 4, characterized in that: The leading edge compensation circuit also includes a second diode; The emitter of the first IGBT switch, the first end of the first diode and the first end of the second diode intersect; the second end of the second diode is grounded.

6. The leading edge compensation circuit according to claim 1, characterized in that: The leading edge compensation circuit further includes a charging unit; the charging unit is connected to the energy storage unit; The charging unit is used to provide electrical energy to the energy storage unit so that the energy storage unit stores electrical energy.

7. The leading edge compensation circuit according to claim 1, characterized in that: The energy storage unit is an energy storage capacitor.

8. The leading edge compensation circuit according to claim 2, characterized in that: The current limiting unit is an inductor.

9. A semiconductor pump light source, characterized in that: It comprises a pulse current generating circuit and a laser diode array, and also comprises a leading edge compensation circuit as described in any one of claims 1 to 8; the leading edge compensation circuit is connected to the pulse current generating circuit and the laser diode array respectively.

10. The semiconductor pump light source according to claim 9, characterized in that: It also includes a shell; the pulse current generating circuit, the laser diode array and the leading edge compensation circuit are all arranged in the shell.

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