CN217158940U - Laser driving system - Google Patents
Laser driving system Download PDFInfo
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- CN217158940U CN217158940U CN202220746599.3U CN202220746599U CN217158940U CN 217158940 U CN217158940 U CN 217158940U CN 202220746599 U CN202220746599 U CN 202220746599U CN 217158940 U CN217158940 U CN 217158940U
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Abstract
The present disclosure relates to a laser driving system, comprising: a laser transmitter; the main control chip is provided with a PWM signal output end; the laser driving circuit is provided with a PWM signal receiving end, a driving end and an output voltage end, the PWM signal receiving end of the laser driving circuit is connected with the PWM signal output end of the main control chip, the driving end is connected with the laser emitter, and the laser driving circuit is used for adjusting the laser power value of the laser emitter according to the PWM signal value sent by the main control chip; the input end of the delay protection circuit is connected with the output voltage end of the laser driving circuit, the output end of the delay protection circuit is connected with the PWM signal receiving end of the laser driving circuit, and the delay protection circuit is used for adjusting the receiving state of the PWM signal receiving end of the laser driving circuit according to the output voltage of the laser driving circuit. The scheme can improve or prevent abnormal light emission, thereby improving the condition of laser damage.
Description
Technical Field
The disclosure belongs to the technical field of laser, and particularly relates to a laser driving system.
Background
With the continuous development of laser technology, more and more scenes can use laser equipment. However, at present, the laser driving system in the market is easy to have abnormal light emission or the light emission system is unstable, which causes laser damage.
SUMMERY OF THE UTILITY MODEL
The purpose of the present disclosure is to provide a laser driving system, which can improve or prevent abnormal light emission, thereby improving the occurrence of laser damage.
The present disclosure provides a laser driving system, which includes:
a laser transmitter;
the main control chip is provided with a PWM signal output end;
the laser driving circuit is provided with a PWM signal receiving end, a driving end and an output voltage end, the PWM signal receiving end of the laser driving circuit is connected with the PWM signal output end of the main control chip, the driving end is connected with the laser emitter, and the laser driving circuit is used for adjusting the laser power value of the laser emitter according to the PWM signal value sent by the main control chip;
the input end of the delay protection circuit is connected with the output voltage end of the laser driving circuit, the output end of the delay protection circuit is connected with the PWM signal receiving end of the laser driving circuit, and the delay protection circuit is used for adjusting the receiving state of the PWM signal receiving end of the laser driving circuit according to the output voltage of the laser driving circuit.
In an exemplary embodiment of the present disclosure, the delay protection circuit includes a delay protection chip and an isolation diode;
the input end of the delay protection chip is connected with the output voltage end of the laser driving circuit, the output end of the delay protection chip is connected with the cathode of the isolation diode, the grounding end of the delay protection chip is grounded, and the anode of the isolation diode is connected with the PWM signal receiving end of the laser driving circuit;
the output end of the time delay protection chip is used for outputting a first level signal when the output voltage of the laser driving circuit is greater than the set input voltage of the time delay protection chip so that the PWM signal receiving end of the laser driving circuit can receive the PWM signal sent by the main control chip, and is used for outputting a second level signal when the output voltage of the laser driving circuit is less than the set input voltage of the time delay protection chip so that the signal received by the PWM signal receiving end of the laser driving circuit is 0.
In an exemplary embodiment of the present disclosure, the laser driving circuit includes:
the switch MOS tube is provided with a first end, a second end and a control end, and the first end is grounded;
the laser driving chip is provided with the PWM signal receiving end, the driving end, the output voltage end, an input voltage end, a grounding end and a chip selection end, wherein the input voltage end of the laser driving chip is connected with the power supply end, and the grounding end of the laser driving chip is grounded;
two ends of the first pull-up resistor are respectively connected with a PWM signal receiving end and an output voltage end of the laser driving chip;
the two ends of the current sensing resistor are respectively connected with the input voltage end and the chip selection end of the laser driving chip, and one end of the current sensing resistor connected with the chip selection end is connected with the anode of the laser transmitter;
the two ends of the first overshoot protection resistor are respectively connected with the driving end of the laser driving chip and the control end of the switch MOS tube;
the negative electrode and the positive electrode of the follow current conducting diode are respectively connected with the input voltage end of the laser driving chip and the second end of the switch MOS tube;
and two ends of the energy storage inductor are respectively connected with the second end of the switch MOS tube and the negative electrode of the laser emitter.
In an exemplary embodiment of the present disclosure, the laser driving circuit further includes:
one end of the first filter circuit is connected with the input voltage end of the laser driving chip, and the other end of the first filter circuit is grounded;
one end of the second filter circuit is connected with the output voltage end of the laser driving chip, and the other end of the second filter circuit is grounded;
and one end of the third filter circuit is connected with one end of the current sensing resistor, which is connected with the chip selection end, and the other end of the third filter circuit is connected with one end of the energy storage inductor, which is connected with the negative electrode of the laser transmitter.
In one exemplary embodiment of the present disclosure,
the first filter circuit and the third filter circuit both comprise two filter capacitors which are arranged in parallel, and the second filter circuit comprises one filter capacitor.
In an exemplary embodiment of the present disclosure, the current sensing resistors are provided in two and in parallel.
In an exemplary embodiment of the present disclosure, the laser emitter includes a plurality of laser diodes connected in series, a negative electrode of the laser diode is connected to the energy storage inductor, and a positive electrode of the laser diode is connected to one end of the current sensing resistor, which is connected to the chip selection terminal.
In an exemplary embodiment of the present disclosure, the rated laser power value of the laser diode is 5W, 10W, or 20W.
In an exemplary embodiment of the present disclosure, the laser driver further includes a level conversion circuit connected between the PWM signal output terminal of the main control chip and the PWM signal receiving terminal of the laser driving circuit.
In an exemplary embodiment of the present disclosure, the level conversion circuit further includes:
a current limiting protection resistor;
a second pull-up resistor;
a second overshoot protection resistor;
a base electrode of the first triode is connected with the PWM signal output end of the main control chip through the second overshoot protection resistor, a collector electrode of the first triode is connected with a power supply end through the second pull-up resistor, and an emitting electrode of the first triode is grounded;
and the base electrode of the second triode is connected with the collector of the first triode through the current-limiting protection resistor, the collector of the second triode is connected with the PWM signal receiving end of the laser driving chip, and the emitter of the second triode is grounded.
The scheme disclosed by the invention has the following beneficial effects:
according to the laser transmitter, the delay protection circuit is arranged, the receiving state of a PWM (pulse width modulation) signal receiving end of the laser driving circuit can be adjusted according to the output voltage of the laser driving circuit, specifically, when the delay protection circuit determines that the output voltage of the laser driving circuit reaches a stable voltage threshold value, the output end of the delay protection circuit can output a level signal corresponding to the stable state, and at the moment, the laser driving circuit can normally receive the PWM signal sent by the main control chip and adjust the laser power value of the laser transmitter according to the PWM signal value sent by the main control chip; when the delay protection circuit determines that the output voltage of the laser driving circuit does not reach the stable voltage threshold value, the output end of the delay protection circuit can output level signals corresponding to the non-stable state, at the moment, no matter how the PWM signals sent by the main control chip change, the signals input by the PWM signal output end of the laser driving circuit are 0, so that the laser emitter does not emit laser, the whole laser driving system is protected, abnormal light emission can be improved or prevented, and then the laser damage condition is improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 shows a block diagram of a laser driving system according to an embodiment of the present disclosure;
fig. 2 shows a circuit diagram of a laser driving system according to an embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
The present disclosure is described in further detail below with reference to the figures and the specific embodiments. It should be noted that the technical features involved in the embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present disclosure, and should not be construed as limiting the present disclosure.
The embodiment of the disclosure provides a laser driving system, which is applicable to the field of desktop-level laser equipment; as shown in fig. 1, the laser driving system may include a laser transmitter 100, a main control chip 110, a laser driving circuit 120, and a delay protection circuit 130.
Specifically, the main control chip 110 may have a PWM signal output terminal, and the PWM signal output terminal may be used for outputting a PWM signal. For example, the main control chip 110 may be an MCU (micro controller Unit).
The laser driving circuit 120 may have a PWM signal receiving end, a driving end, and an output voltage end, the PWM signal receiving end of the laser driving circuit 120 is connected to the PWM signal output end of the main control chip 110, the driving end of the laser driving circuit 120 is connected to the laser emitter 100, and the laser driving circuit 120 is configured to adjust the laser power value of the laser emitter 100 according to the PWM signal value sent by the main control chip 110.
The delay protection circuit 130 may have an input terminal and an output terminal, the input terminal of the delay protection circuit 130 is connected to the output voltage terminal of the laser driving circuit 120, the output terminal of the delay protection circuit 130 is connected to the PWM signal receiving terminal of the laser driving circuit 120, and the delay protection circuit 130 is configured to adjust the receiving state of the PWM signal receiving terminal of the laser driving circuit 120 according to the output voltage of the laser driving circuit 120.
In the embodiment of the present disclosure, by providing the delay protection circuit 130 in the laser driving system, the delay protection circuit 130 may adjust a receiving state of a PWM (pulse width modulation) signal receiving end of the laser driving circuit 120 according to an output voltage of the laser driving circuit 120, specifically, when the delay protection circuit 130 determines that the output voltage of the laser driving circuit 120 reaches a stable voltage threshold, an output end of the delay protection circuit 130 may output a level signal corresponding to the stable state, and at this time, the laser driving circuit 120 may normally receive the PWM signal sent by the main control chip 110 and adjust a laser power value of the laser transmitter 100 according to a PWM signal value sent by the main control chip 110; when the delay protection circuit 130 determines that the output voltage of the laser driving circuit 120 does not reach the stable voltage threshold, the output end of the delay protection circuit 130 may output a level signal corresponding to a non-stable state, and at this time, no matter how the PWM signal sent by the main control chip 110 changes, the signal input by the PWM signal output end of the laser driving circuit 120 is 0, so that the laser emitter 100 does not emit laser, thereby protecting the whole laser driving system, improving or preventing abnormal light emission, and further improving the laser damage.
The laser driving system will be described in detail below.
As shown in fig. 1 and fig. 2, the delay protection circuit 130 may include a delay protection chip U2 and an isolation diode D5, an input terminal Vth of the delay protection chip U2 is connected to an output voltage terminal Vcc of the laser driving circuit 120, an output terminal Vout of the delay protection chip U2 is connected to a cathode of the isolation diode D5, a ground terminal Gnd of the delay protection chip U2 is grounded, and an anode of the isolation diode D5 is connected to a PWM signal receiving terminal Vpwm of the laser driving circuit 120.
Specifically, the output terminal Vout of the delay protection chip U2 is used to output a first level signal when the output voltage of the laser driver circuit 120 is greater than the set input voltage of the delay protection chip U2, for example, the first level signal may be a high level signal, so that the PWM signal receiving terminal Vpwm of the laser driver circuit 120 can receive the PWM signal (i.e., MCU-PWM in fig. 2) sent by the main control chip 110, that is, when the output voltage of the output voltage terminal Vcc of the laser driver circuit 120 is greater than the set input voltage of the input terminal Vth of the delay protection chip U2, the delay protection chip U2 determines that the output voltage of the laser driver circuit 120 reaches a stable voltage threshold, and at this time, the entire laser driver system is in a normal state, the laser driver circuit 120 can normally receive the PWM signal sent by the main control chip 110, and adjust the working current of the laser transmitter 100 according to the value of the PWM signal sent by the main control chip 110, thereby adjusting the amount of laser power output by the laser transmitter 100.
The output terminal Vout of the delay protection chip U2 is used to output a second level signal when the output voltage of the laser driving circuit 120 is less than the set input voltage of the delay protection chip U2, for example, the second level signal may be a low level signal, so that the Vpvm receiving terminal of the PWM signal of the laser driving circuit 120 receives a signal of 0, that is, when the Vcc output voltage of the output voltage terminal of the laser driving circuit 120 is less than the set input voltage of the delay protection chip U2, the delay protection chip U2 determines that the output voltage of the laser driving circuit 120 does not reach a stable voltage threshold, at this time, the whole laser driving system is in an abnormal state, no matter how the PWM signal sent by the main control chip 110 changes, the signal input by the Vpwm receiving terminal of the PWM signal of the laser driving circuit 120 is 0, so that the laser emitter 100 does not emit laser, thereby protecting the whole laser driving system, abnormal light emission can be improved or prevented, and then the situation of laser damage is improved.
It should be noted that, in this embodiment, the specific model of the delay protection chip U2 is not limited, as long as the chip can implement the above functions.
In addition, as shown in fig. 1 and fig. 2, the isolation diode D5 is disposed in the delay protection circuit 130, so that the MCU-PWM signal can be isolated from affecting the operation of the delay protection chip U2.
In an embodiment of the present disclosure, as shown in fig. 1 and fig. 2, the laser driving circuit 120 may include a switching MOS transistor Q1, a laser driving chip U1, a first pull-up resistor R5, current sensing resistors R1, R2, a first overshoot protection resistor R3, a freewheeling diode D2, and an energy storage inductor L.
Specifically, as shown in fig. 2, the switching MOS transistor Q1 may have a first terminal S, a second terminal D, and a control terminal G, and the first terminal S of the switching MOS transistor Q1 is grounded DGND. The laser driver chip U1 may have the aforementioned PWM signal receiving terminal Vpwm, driving terminal DRV and output voltage terminal Vcc, and further has an input voltage terminal Vin, a ground terminal Vss and a chip select terminal CS. The input voltage terminal Vin of the laser driver chip U1 is connected to the power supply terminal VCC, for example, the voltage provided by the power supply terminal VCC of the embodiment of the disclosure may be 12V, but is not limited thereto. The ground terminal Vss of the laser driver chip U1 is grounded DGND.
In the embodiment of the disclosure, the switching MOS transistor Q1 functions as a switch, and the driving terminal DRV of the laser driving chip U1 adjusts the change of the output current by adjusting the switching frequency and the time duration of the switching MOS transistor Q1, so as to adjust the laser power value emitted by the laser emitter 100.
For example, the switching MOS transistor Q1 according to the embodiment of the present disclosure may be of an NMOS type, but is not limited thereto, and may also be of a PMOS type.
As shown in fig. 2, both ends of the first pull-up resistor R5 are connected to the PWM signal receiving terminal Vpwm and the output voltage terminal Vcc of the laser driver chip U1, respectively.
As shown in fig. 1 and fig. 2, two current sensing resistors may be disposed and connected in parallel, which correspond to reference numerals R1 and R2 in fig. 2, respectively. Specifically, two ends of the current sensing resistors R1 and R2 are respectively connected to the input voltage terminal Vin and the chip selection terminal CS of the laser driving chip U1, and one ends of the current sensing resistors R1 and R2 connected to the chip selection terminal CS are connected to the positive electrode of the laser emitter 100.
In this embodiment, the current sensing resistors R1 and R2 are used to set the maximum output current of the laser driver chip U1, and specific values may be determined according to specific situations, which are not described in detail herein.
As shown in fig. 2, two ends of the first overshoot protection resistor R3 are respectively connected to the driving terminal DRV of the laser driver chip U1 and the control terminal G of the switching MOS transistor Q1, for performing overshoot protection.
As shown in fig. 2, the negative electrode and the positive electrode of the freewheeling diode D2 are connected to the input voltage terminal Vin of the laser driver chip U1 and the second terminal D of the switch MOS transistor Q1, respectively, and the freewheeling diode D2 plays a freewheeling role to ensure that when the switch MOS transistor Q1 is turned off, the current has a complete conduction loop.
As shown in fig. 1 and fig. 2, two ends of the energy storage inductor L are respectively connected to the second end D of the switching MOS transistor Q1 and the negative electrode of the laser emitter 100.
In the embodiment of the present disclosure, the energy storage inductor L may have an energy storage function, and when the switching MOS transistor Q1 is turned off, since the inductor current cannot change suddenly, the continuity of the current on the laser emitter 100 may be ensured.
The laser transmitter 100 may include a plurality of laser diodes connected in series, for example, two laser diodes shown in fig. 2, which are respectively labeled as D3 and D4, a cathode of the laser diode D4 is connected to the energy storage inductor L, an anode of the laser diode D4 is connected to a cathode of the laser diode D3, and an anode of the laser diode D3 is connected to one end of the current sensing resistor R1 and R2 connected to the chip selection terminal CS.
For example, the rated laser power of the laser diode may be 5W, 10W or 20W, but is not limited thereto, and may be other values as the case may be.
In an exemplary embodiment of the present disclosure, the laser driving circuit 120 further includes a filter circuit to perform a filtering function.
Specifically, three filter circuits can be provided, which are respectively a first filter circuit, a second filter circuit and a third filter circuit.
As shown in fig. 1 and 2, one end of the first filter circuit is connected to the input voltage terminal Vin of the laser driver chip U1, and the other end is grounded to the DGND. One end of the second filter circuit is connected to the output voltage terminal Vcc of the laser driver chip U1, and the other end is grounded DGND. One end of the third filter circuit is connected with one end of the current sensing resistors R1 and R2, which is connected with the chip selection end CS, and the other end of the third filter circuit is connected with one end of the energy storage inductor L, which is connected with the negative electrode of the laser transmitter 100.
Further, as shown in fig. 2, the first filter circuit may include two filter capacitors C3, C4 arranged in parallel, the second filter circuit may include two filter capacitors C1, C2 arranged in parallel, and the second filter circuit includes one filter capacitor C5.
In an embodiment of the present disclosure, as shown in fig. 1 and fig. 2, the laser driving system further includes a level conversion circuit 140 connected between the PWM signal output terminal of the main control chip 110 and the PWM signal receiving terminal Vpwm of the laser driving circuit 120, and the level conversion circuit 140 can improve compatibility of the entire laser driving system, and can be compatible with more types of laser driving chips.
Specifically, as shown in fig. 1 and fig. 2, the level shift circuit 140 further includes a current-limiting protection resistor R6, a second pull-up resistor R4, a second overshoot protection resistor R7, a first transistor Q3, and a second transistor Q2. The base b of the first transistor Q3 is connected to the PWM signal output terminal of the main control chip 110 through the second overshoot protection resistor R7, the collector c of the first transistor Q3 is connected to the power supply terminal through the second pull-up resistor R4, and the emitter e of the first transistor Q3 is grounded DGND.
The base b of the second triode Q2 is connected with the collector of the first triode Q3 through a current-limiting protection resistor R6, the collector c of the second triode Q2 is connected with the PWM signal receiving end Vpwm of the laser driving chip U1, and the emitter e of the second triode Q2 is grounded DGND.
For example, the first transistor Q3 and the second transistor Q2 of the embodiment of the disclosure may be NPN type, but are not limited thereto, and may also be PNP type, as the case may be.
Based on the above, when the voltage output by the output voltage terminal Vcc of the laser driving chip U1 is greater than the set input voltage of the input terminal Vth of the delay protection chip U2, the output terminal Vout of the delay protection chip U2 outputs a high level, and at this time, the laser driving chip U1 normally receives the MCU _ PWM signal to perform laser power adjustment; when the MCU _ PWM is at a high level, a PWM signal receiving end Vpwm of the laser driving chip U1 is a high level signal; when the MCU _ PWM is at a low level, a PWM signal receiving end Vpwm of the laser driving chip U1 is a low level signal; therefore, the normal high-low change of the PWM is realized, at the moment, the whole circuit works normally, and the light power of the output laser is adjusted.
When the laser driving chip U1 is abnormal or failed, namely: when the voltage output by the output voltage terminal Vcc of the laser driving chip U1 is less than the set input voltage of the input terminal Vth of the delay protection chip U2, the output terminal Vout of the delay protection chip U2 is at a low level, and at this time, the PWM signal receiving terminal Vpwm of the laser driving chip U1 is pulled low, and cannot receive the MCU _ PWM signal; the whole system is protected to prevent abnormal laser emission.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, features defined as "first," "second," "third," etc. may explicitly or implicitly include one or more of the features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In the description herein, references to the description of the terms "some embodiments," "exemplary," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or exemplary is included in at least one embodiment or exemplary of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present disclosure have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure, and therefore all changes and modifications that are intended to be covered by the claims and the specification of this disclosure are within the scope of the patent disclosure.
Claims (10)
1. A laser driving system, comprising:
a laser transmitter;
the main control chip is provided with a PWM signal output end;
the laser driving circuit is provided with a PWM signal receiving end, a driving end and an output voltage end, the PWM signal receiving end of the laser driving circuit is connected with the PWM signal output end of the main control chip, the driving end is connected with the laser emitter, and the laser driving circuit is used for adjusting the laser power value of the laser emitter according to the PWM signal value sent by the main control chip;
the input end of the delay protection circuit is connected with the output voltage end of the laser driving circuit, the output end of the delay protection circuit is connected with the PWM signal receiving end of the laser driving circuit, and the delay protection circuit is used for adjusting the receiving state of the PWM signal receiving end of the laser driving circuit according to the output voltage of the laser driving circuit.
2. The laser driving system according to claim 1, wherein the delay protection circuit includes a delay protection chip and an isolation diode;
the input end of the delay protection chip is connected with the output voltage end of the laser driving circuit, the output end of the delay protection chip is connected with the cathode of the isolation diode, the grounding end of the delay protection chip is grounded, and the anode of the isolation diode is connected with the PWM signal receiving end of the laser driving circuit;
the output end of the time delay protection chip is used for outputting a first level signal when the output voltage of the laser driving circuit is greater than the set input voltage of the time delay protection chip so that the PWM signal receiving end of the laser driving circuit can receive the PWM signal sent by the main control chip, and is used for outputting a second level signal when the output voltage of the laser driving circuit is less than the set input voltage of the time delay protection chip so that the signal received by the PWM signal receiving end of the laser driving circuit is 0.
3. The laser driving system according to claim 2, wherein the laser driving circuit comprises:
the switch MOS tube is provided with a first end, a second end and a control end, and the first end is grounded;
the laser driving chip is provided with the PWM signal receiving end, the driving end, the output voltage end, an input voltage end, a grounding end and a chip selection end, wherein the input voltage end of the laser driving chip is connected with the power supply end, and the grounding end of the laser driving chip is grounded;
two ends of the first pull-up resistor are respectively connected with a PWM signal receiving end and an output voltage end of the laser driving chip;
the two ends of the current sensing resistor are respectively connected with the input voltage end and the chip selection end of the laser driving chip, and one end of the current sensing resistor connected with the chip selection end is connected with the anode of the laser transmitter;
the two ends of the first overshoot protection resistor are respectively connected with the driving end of the laser driving chip and the control end of the switch MOS tube;
the negative electrode and the positive electrode of the follow current conducting diode are respectively connected with the input voltage end of the laser driving chip and the second end of the switch MOS tube;
and two ends of the energy storage inductor are respectively connected with the second end of the switch MOS tube and the negative electrode of the laser emitter.
4. The laser driving system according to claim 3, wherein the laser driving circuit further comprises:
one end of the first filter circuit is connected with the input voltage end of the laser driving chip, and the other end of the first filter circuit is grounded;
one end of the second filter circuit is connected with the output voltage end of the laser driving chip, and the other end of the second filter circuit is grounded;
and one end of the third filter circuit is connected with one end of the current sensing resistor, which is connected with the chip selection end, and the other end of the third filter circuit is connected with one end of the energy storage inductor, which is connected with the negative electrode of the laser transmitter.
5. The laser driving system according to claim 4,
the first filter circuit and the third filter circuit both comprise two filter capacitors which are arranged in parallel, and the second filter circuit comprises one filter capacitor.
6. The laser driving system according to claim 3, wherein the current sensing resistors are arranged in two and in parallel.
7. The laser driving system according to claim 3, wherein the laser transmitter comprises a plurality of laser diodes connected in series, a cathode of the laser diode is connected to the energy storage inductor, and an anode of the laser diode is connected to one end of the current sensing resistor connected to the chip selection terminal.
8. The laser driving system according to claim 7, wherein the laser diode has a rated laser power value of 5W, 10W, or 20W.
9. The laser driving system according to claim 1, further comprising a level conversion circuit connected between the PWM signal output terminal of the main control chip and the PWM signal receiving terminal of the laser driving circuit.
10. The laser driving system according to claim 9, wherein the level conversion circuit further comprises:
a current limiting protection resistor;
a second pull-up resistor;
a second overshoot protection resistor;
a base electrode of the first triode is connected with the PWM signal output end of the main control chip through the second overshoot protection resistor, a collector electrode of the first triode is connected with a power supply end through the second pull-up resistor, and an emitting electrode of the first triode is grounded;
and the base electrode of the second triode is connected with the collector electrode of the first triode through the current-limiting protection resistor, the collector electrode of the second triode is connected with the PWM signal receiving end of the laser driving circuit, and the emitting electrode of the second triode is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220746599.3U CN217158940U (en) | 2022-03-31 | 2022-03-31 | Laser driving system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220746599.3U CN217158940U (en) | 2022-03-31 | 2022-03-31 | Laser driving system |
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| CN217158940U true CN217158940U (en) | 2022-08-09 |
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| CN202220746599.3U Active CN217158940U (en) | 2022-03-31 | 2022-03-31 | Laser driving system |
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