CN219304466U - Laser source protection circuit, laser projection module and depth camera - Google Patents
Laser source protection circuit, laser projection module and depth camera Download PDFInfo
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- CN219304466U CN219304466U CN202222509038.4U CN202222509038U CN219304466U CN 219304466 U CN219304466 U CN 219304466U CN 202222509038 U CN202222509038 U CN 202222509038U CN 219304466 U CN219304466 U CN 219304466U
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Abstract
The utility model provides a laser source protection circuit, a laser projection module and a depth camera. The laser source protection circuit comprises a pulse signal circuit, a switch detection circuit and a control circuit; the pulse signal circuit, the switch detection circuit and the control circuit are respectively connected with the power supply and the driving circuit, and the switch detection circuit is connected with the control circuit; the pulse signal circuit is used for outputting a pulse signal to drive the driving circuit; the switch detection circuit is used for detecting whether the driving current of the driving circuit is abnormal or not; the control circuit is used for detecting whether the pulse width of the pulse signal is abnormal or not and detecting whether the input voltage of the driving circuit is abnormal or not; the control circuit is further configured to control the switch detection circuit to cut off the supply of electric power between the power supply and the drive circuit when at least one of the drive current of the drive circuit, the pulse width of the pulse signal, and the input voltage of the drive circuit is abnormal. The utility model improves the comprehensiveness of the laser source protection function.
Description
[ field of technology ]
The present utility model relates to the field of laser technologies, and in particular, to a laser source protection circuit, a laser projection module, and a depth camera.
[ background Art ]
In the related art, a depth camera generally includes a laser source and a driving circuit electrically connected to the laser source, wherein the driving circuit is used for performing low-frequency (such as 30Hz or 60 Hz) and constant-current driving on the laser source so as to make the laser source emit laser. As known, the driving current of the laser product is relatively large, which results in relatively high output power of the laser, and the depth camera is not exceptional, if the design of the circuit of the laser source is unreasonable or abnormal during use, serious laser safety problems are faced, such as damage to sensitive parts of eyes, skin and the like caused by the laser emitted by the laser source directly or indirectly, damage of the light source, open fire and the like, so when the laser product is used, besides the safety design in the fields of optics, structure and the like, the safety design is needed to be carried out on the circuit to improve the safety performance.
However, the driving circuit in the existing depth camera only has a single protection function such as overcurrent or overvoltage, which results in poor comprehensiveness of the depth camera on the protection function of the laser source, thereby reducing the safety performance of the depth camera.
Therefore, there is a need for an improvement in the structure of the laser source circuit in the depth camera.
[ utility model ]
The utility model provides a laser source protection circuit, a laser projection module and a depth camera, and aims to solve the problem of poor comprehensiveness of a laser source protection function in the related art.
In order to solve the technical problems, the embodiment of the utility model comprises a power supply and a driving circuit, wherein the driving circuit is used for driving a laser source to work; further comprises: a pulse signal circuit for outputting a pulse signal to drive the driving circuit; a switch detection circuit for detecting whether the driving current of the driving circuit is abnormal; a control circuit for detecting whether the pulse width of the pulse signal is abnormal or not and detecting whether the input voltage of the driving circuit is abnormal or not; and the control circuit is connected with the switch detection circuit and is also used for controlling the switch detection circuit to cut off the supply of electric energy between the power supply and the driving circuit when at least one of the driving current of the driving circuit, the pulse width of the pulse signal and the input voltage of the driving circuit is abnormal.
In some embodiments, the output end of the pulse signal circuit is provided with a signal detection point, and the control circuit is specifically configured to detect whether the pulse width of the pulse signal is abnormal through the signal detection point. The output end of the driving circuit is provided with a signal detection point, and the control circuit is specifically used for detecting whether the pulse width of the pulse signal is abnormal or not through the signal detection point. The output end of the pulse signal circuit is provided with a first signal detection point, and the output end of the driving circuit is provided with a second signal detection point; the laser source protection circuit also comprises a switch; when the change-over switch is in a first connection state, the control circuit is connected with the first signal detection point to detect whether the pulse width of the pulse signal is abnormal or not; when the change-over switch is in the second connection state, the control circuit is connected with the second signal detection point to detect whether the pulse width of the pulse signal is abnormal. The input end of the driving circuit is provided with a current detection point, and the switch detection circuit is specifically used for detecting whether the driving current of the driving circuit is abnormal or not through the current detection point.
In some embodiments, the switch detection circuit includes a power switch branch; the power switch branch is used for adjusting the working state of the power switch branch to be in an off state according to the off signal; the off state is that the power supply between the power supply and the driving circuit is disconnected, and the off signal is output by the control circuit when the driving current of the driving circuit is abnormal, the pulse width of the pulse signal is abnormal or the input voltage of the driving circuit is abnormal. The switch detection circuit comprises an overcurrent detection branch circuit, wherein the overcurrent detection branch circuit is used for detecting whether the driving current of the driving circuit is abnormal or not and outputting an abnormal signal when the driving current of the driving circuit is abnormal; the control circuit is specifically used for outputting a turn-off signal according to the abnormal signal. The control circuit comprises a pulse width detection branch circuit, wherein the pulse width detection branch circuit is used for detecting whether the pulse width of the pulse signal is abnormal or not and outputting a turn-off signal when the pulse width of the pulse signal is abnormal. The control circuit comprises an overvoltage detection branch circuit, wherein the overvoltage detection branch circuit is used for detecting whether the input voltage of the driving circuit is abnormal or not and outputting a turn-off signal when the input voltage of the driving circuit is abnormal.
The second aspect of the embodiment of the utility model provides a depth camera, which comprises a laser source and the laser source protection circuit; the laser source protection circuit is used for driving the laser source to emit laser and disconnecting the power supply when the driving current of the driving circuit is abnormal, the pulse width of the pulse signal is abnormal or the input voltage of the driving circuit is abnormal.
As can be seen from the above description, the present utility model has the following advantageous effects compared with the related art:
the pulse signal circuit, the switch detection circuit and the control circuit are arranged between a power supply and a driving circuit in the laser source, and an electrical connection relationship among the pulse signal circuit, the switch detection circuit, the control circuit, the power supply and the driving circuit is established, and an electrical connection relationship between the switch detection circuit and the control circuit is established. In practical application, when the driving circuit is over-current, broken down (i.e. the driving circuit is directly shorted), or output is shorted (i.e. the output end of the driving circuit is shorted to ground), the driving current of the driving circuit is increased, i.e. the driving current of the driving circuit presents an abnormal state, the switch detection circuit can detect the abnormal state, so that the control circuit controls the switch detection circuit to cut off the supply of electric energy between the power supply and the driving circuit; when the pulse width of the pulse signal for driving the driving circuit is overtime, the pulse width of the pulse signal is abnormal, the control circuit can detect the abnormal state and control the switch detection circuit to cut off the power supply between the power supply and the driving circuit; when the driving circuit is over-voltage, the input voltage of the driving circuit is increased, namely, the input voltage of the driving circuit presents an abnormal state, the control circuit can detect the abnormal state, and the switch detection circuit is controlled to cut off the supply of electric energy between the power supply and the driving circuit. It can be understood that the utility model has at least five protection functions (namely, protection function when pulse width of pulse signal is abnormal, and protection function when driving circuit is over-current, over-voltage, breakdown and output short circuit) for the laser source, thereby improving the comprehensiveness of the protection function of the laser source and enabling the depth camera to have higher safety performance.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the related art or embodiments of the present utility model, the drawings that are needed in the description of the related art or embodiments of the present utility model will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, but not all embodiments, and that other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a structured light depth camera according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a first circuit structure of a laser source protection circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a second circuit structure of a laser source protection circuit according to an embodiment of the present utility model;
fig. 4 is a schematic circuit structure diagram of a laser source protection circuit according to an embodiment of the present utility model when the laser source protection circuit is implemented in an integrated chip manner.
[ detailed description ] of the utility model
In order to make the objects, technical solutions and advantages of the present utility model more obvious and understandable, the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model and the corresponding drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. It should be understood that the following embodiments of the present utility model are only for explaining the present utility model and are not intended to limit the present utility model, that is, all other embodiments obtained by persons skilled in the art without making any inventive effort based on the embodiments of the present utility model are within the scope of protection of the present utility model. Furthermore, the technical features referred to in the embodiments of the present utility model described below may be combined with each other as long as they do not make a conflict with each other.
Referring to fig. 1, a schematic structural diagram of a structured light depth camera according to an embodiment of the present utility model is provided, the structured light depth camera mainly includes a laser projection module 13, an image acquisition module 14, a main control board 12 and a processor 11, the processor 11 is integrated on the main control board 12, and the laser projection module 13 and the image acquisition module 14 are connected with the main control board 12 through an interface. The laser projection module 13 is configured to project the encoded structured light pattern into the target space, and the image acquisition module 14 acquires the structured light pattern and processes the structured light pattern by the processor 11 to obtain a depth image of the target space. In one embodiment, the structured light image is an infrared laser speckle pattern having a relatively uniform particle distribution but a high local uncorrelation, where local uncorrelation refers to each sub-region of the pattern having a high uniqueness. The corresponding image acquisition module 14 is an infrared camera corresponding to the projection module 13. The processor is used for acquiring the depth image, specifically, after receiving the speckle pattern acquired by the image acquisition module, the processor is used for further acquiring the depth image by calculating the deviation value between the speckle pattern and the reference speckle pattern. The laser projection module 13 comprises a laser source, the laser source is electrically connected with a main control board, a laser source protection circuit is arranged on the main control board and used for driving the light source to emit laser and cutting off the power supply of the power supply when the driving current of the driving circuit is abnormal, the pulse width of the pulse signal is abnormal or the input voltage of the driving circuit is abnormal, and the use safety performance of the laser is improved through safety design. It should be noted that the laser protection circuit of the present utility model can also be used for a TOF depth camera.
Referring to fig. 2, fig. 2 is a schematic diagram of a first circuit structure of a laser source protection circuit according to an embodiment of the utility model. The laser source protection circuit provided by the embodiment of the utility model is applied to a laser source 60, and comprises a power supply 50 and a driving circuit 40; the power supply 50 is connected to the driving circuit 40, and the driving circuit 40 is connected to the laser source 60. Specifically, the power supply 50 is used to supply the laser source 60 and the driving circuit 40 with electric power required for operation, and the driving circuit 40 is used to drive the laser source 60 to emit laser light.
Further, the laser source protection circuit provided by the embodiment of the utility model comprises a pulse signal circuit 10, a switch detection circuit 20 and a control circuit 30; the pulse signal circuit 10, the switch detection circuit 20, and the control circuit 30 are connected to the power supply 50 and the drive circuit 30, respectively, and the switch detection circuit 20 is connected to the control circuit 30. Specifically, the pulse signal circuit 10 is for outputting a pulse signal to drive the drive circuit 40; the switch detection circuit 20 is used for detecting whether the driving current of the driving circuit 40 is abnormal; the control circuit 30 is configured to detect whether the pulse width of the pulse signal is abnormal or not, and to detect whether the input voltage of the driving circuit 40 is abnormal or not; the control circuit 30 is also configured to control the switch detection circuit 20 to cut off the supply of electric power between the power supply 50 and the drive circuit 40 when at least one of the drive current of the drive circuit 40, the pulse width of the pulse signal, and the input voltage of the drive circuit 40 is abnormal. In addition, the power supply 50 is also used to supply the power required for operation to the switch detection circuit 20, the control circuit 30, and the pulse signal circuit 10.
Generally, if the driving circuit 40 is in an overcurrent state at the current time, it means that the driving circuit 40 loses control over the driving current, i.e. the driving current exceeds a preset current threshold, which we define as an overcurrent abnormal state. If the driving circuit 40 is shorted by breakdown at the current time (which is equivalent to connecting a switch to the driving circuit 40, and the driving circuit 40 is directly shorted when the switch is closed), it means that the driving circuit 40 loses control over the driving current, i.e. the driving current exceeds the preset current threshold, which we define as breakdown abnormal state. If the driving circuit 40 is short-circuited at the current time (corresponding to a switch connected to ground at the output of the driving circuit 40, the output of the driving circuit 40 is short-circuited to ground when the switch is closed), this means that the driving circuit 40 loses control over the driving current, i.e. the driving current exceeds the preset current threshold, which we define as a short-circuit abnormal state. If the duty ratio of the pulse signal circuit 10 exceeds the set value at the current time, that is, the pulse width of the pulse signal output by the pulse signal circuit 10 is overtime, the light power of the laser emitted by the laser source 60 is severely beyond the standard, which can result in the aggravation of the temperature rise of the laser source 60, and the laser source 60 is burned when serious, which is defined as the abnormal pulse width state. If the driving circuit 40 is in an over-voltage state at the current time, the input voltage exceeds a predetermined voltage threshold, which is defined as an over-voltage abnormal state. The laser source protection circuit provided by the embodiment of the utility model is designed for the abnormal states.
In practical applications, when the driving circuit 40 is in an overcurrent abnormal state, a breakdown abnormal state or a short-circuit abnormal state, the driving current of the driving circuit 40 exceeds a preset current threshold, and the switch detection circuit 20 detects the abnormal state of the driving current, so that the control circuit 30 controls the switch detection circuit 20 to cut off the supply of electric energy between the power supply 50 and the driving circuit 40; when the driving circuit 40 is in an abnormal state of pulse width, a phenomenon of pulse width timeout occurs in a pulse signal for driving the driving circuit 40, the control circuit 30 detects the abnormal state of the pulse signal, and controls the switch detection circuit 20 to cut off the supply of electric power between the power supply 50 and the driving circuit 40; when the driving circuit 40 is in an overvoltage abnormal state, the input voltage of the driving circuit 40 exceeds a preset voltage threshold, and the control circuit 30 detects the abnormal state of the input voltage and controls the switch detection circuit 20 to cut off the supply of electric power between the power supply 50 and the driving circuit 40.
From the above, the embodiment of the utility model has at least five protection functions (namely, protection functions in the overcurrent abnormal state, the breakdown abnormal state, the short circuit abnormal state, the pulse width abnormal state and the overvoltage abnormal state) on the laser source, thereby improving the comprehensiveness of the protection function of the laser circuit and enabling the depth camera to have higher safety performance. In addition, it should be noted that, although the connection between the driving circuit 40 and the laser source 60 in fig. 1 belongs to the common cathode driving mode, it is well known that the common cathode driving mode and the common anode driving mode are two most common connection modes of the laser, so the connection between the driving circuit 40 and the laser source 60 in fig. 1 can be replaced by the common anode driving mode, that is, the laser source protection circuit provided by the embodiment of the present utility model is applicable to both the common cathode driving mode and the common anode driving mode.
As an implementation manner, please further refer to fig. 3, fig. 3 is a schematic diagram of a second circuit structure of the laser source protection circuit according to an embodiment of the present utility model. The output end of the pulse signal circuit 10 (corresponding to the input end of the driving circuit 40) may be provided with a first signal detection point a, the output end of the driving circuit 40 may be provided with a second signal detection point b, and the pulse signal to be detected is acquired by the first signal detection point a or the second signal detection point b in this embodiment. Based on this, the laser source protection circuit provided in the embodiment of the present utility model may further include a switch KG, where the control circuit 30 is connected to the first signal detection point a or the second signal detection point b through the switch KG. It can be understood that, when the switch KG is connected to the first signal detection point a, the control circuit 30 detects whether the pulse width of the pulse signal is abnormal through the first signal detection point a, that is, obtains the pulse signal to be detected from the first signal detection point a; when the switch KG is connected to the second signal detecting point b, the control circuit 30 detects whether the pulse width of the pulse signal is abnormal through the second signal detecting point b, that is, obtains the pulse signal to be detected from the second signal detecting point b. Of course, in other embodiments, only the first signal detection point a may be provided, and the control circuit 30 detects whether the pulse width of the pulse signal is abnormal only through the first signal detection point a; similarly, only the second signal detection point b may be provided, and the control circuit 30 may detect whether the pulse width of the pulse signal is abnormal only through the second signal detection point b.
In the present embodiment, the first signal detection point a is a pulse width from the pulse signal circuit 10 side to monitor the pulse signal, and the second signal detection point b is a pulse width from the output side of the driving circuit 40 to monitor the pulse signal, or a pulse width from the pulse signal circuit 10 side to monitor the pulse signal. In practical applications, the connection relationship between the switch KG and the first signal detecting point a and the second signal detecting point b can be adjusted according to the actual requirement, so that the control circuit 30 obtains the pulse signal to be detected from the first signal detecting point a or the second signal detecting point b. It will be appreciated that the first signal detection point a is monitored from the signal source end, and the second signal detection point b is monitored from the output end of the driving circuit 40 to the signal source end, so that the safety performance is higher, and therefore, it is preferable that the control circuit 30 obtains the pulse signal to be detected from the second signal detection point b.
As an embodiment, still referring to fig. 3, the input terminal of the driving circuit 40 may be provided with a current detection point c, and the switch detection circuit 20 detects whether the driving current of the driving circuit 40 is abnormal through the current detection point c, that is, obtains the driving current to be detected from the current detection point c. It can be understood that the current detection point c is disposed at the input end of the driving circuit 40 in this embodiment, so that the detection range of the driving current is wider, for example, when the driving circuit 40 and the current on the laser source 60 side have problems, the current detection point c can be detected in this embodiment.
As an embodiment, still referring to fig. 3, the output terminal of the power supply 50 may be provided with a voltage detection point d, and the control circuit 30 detects whether the input voltage of the driving circuit 40 is abnormal through the voltage detection point d, that is, obtains the input voltage to be detected from the voltage detection point d. It will be appreciated that the input voltage of the driving circuit 40 is actually the output voltage of the power supply 50, so this embodiment sets the voltage detection point d at the output terminal of the power supply 50, which is the most direct detection mode.
As an embodiment, still referring to fig. 2, the switch detection circuit 20 may include an over-current detection branch 21 and a power switch branch 22, and the control circuit 30 may include an over-voltage detection branch 31 and a pulse width detection branch 32.
Specifically, the overcurrent detection branch 21 is configured to detect whether the driving current of the driving circuit 40 is abnormal, and output an abnormal signal to the control circuit 30 when the driving current of the driving circuit 40 is abnormal, so that the control circuit 30 outputs a turn-off signal to the power switch branch 22 according to the abnormal signal; the pulse width detection branch 32 is used for detecting whether the pulse width of the pulse signal is abnormal or not, and outputting a turn-off signal to the power switch branch 22 when the pulse width of the pulse signal is abnormal; the overvoltage detection branch 31 is used for detecting whether the input voltage of the driving circuit 40 is abnormal or not, and outputting a turn-off signal to the power switch branch 22 when the input voltage of the driving circuit 40 is abnormal; the power switch branch 22 is used for adjusting the working state of the power switch branch to be in an off state according to the off signal; wherein the off state indicates that the power supply between the power supply 50 and the driving circuit 40 is disconnected. Accordingly, the operating state of the power switching leg 22 also includes an open state, indicating that the power supply between the power source 50 and the drive circuit 40 is established.
It should be noted that each of the above-mentioned branches is a specific detection or switching function of the corresponding circuit, and is not necessarily a specific circuit, and is used only for understanding convenience, and is not particularly limited thereto.
It should be understood that the foregoing implementation is merely a preferred implementation of the embodiments of the present utility model, and is not the only limitation on the specific configurations of the switch detection circuit 20 and the control circuit 30, and the specific settings of the current detection point, the signal detection point, and the voltage detection point; in this regard, those skilled in the art may flexibly set according to the actual application scenario on the basis of the embodiment of the present utility model.
In view of the foregoing, the embodiment of the present utility model provides a laser source protection circuit, which can perform safety protection against an overcurrent abnormal state, a breakdown abnormal state, a short-circuit abnormal state, a pulse width abnormal state, and an overvoltage abnormal state of the driving circuit 40, specifically, when the driving circuit 40 is in at least one of the abnormal states, the power supply between the power supply 50 and the driving circuit 40 is cut off, and once the driving circuit 40 is no longer in any abnormal state, the power supply to the driving circuit 40 can be restored (that is, the working state of the power switch branch 22 is adjusted to be an on state). Preferably, the laser source protection circuit provided in the embodiment of the present utility model is implemented by using an integrated chip, and the preferred implementation scheme is briefly described below with reference to a schematic circuit structure diagram when the laser source protection circuit shown in fig. 4 is implemented by using an integrated chip.
When the laser source protection circuit is implemented by using an integrated chip, the function of the pulse signal circuit 10 may be implemented by the main control chip in fig. 4, the function of the switch detection circuit 20 may be implemented by the switch detection chip in fig. 4, the function of the control circuit 30 may be implemented by the control chip in fig. 4, and the function of the driving circuit 40 may be implemented by the driving chip in fig. 4. In practical application, when the driving chip is in an overcurrent abnormal state, a breakdown abnormal state or a short-circuit abnormal state, the driving current of the driving chip obtained from the current detection point c by the switch detection chip exceeds a preset current threshold value, and in this case, the FAULT output function of the switch detection chip is triggered, that is, the pin FAULT of the switch detection chip outputs an abnormal signal to the pin GPIO1 of the control chip, and after receiving the abnormal signal, the control chip outputs a turn-off signal to the enable pin EN of the switch detection chip through the other pin GPIO2 so as to turn off the enable pin EN, thereby cutting off the supply of electric energy between the power supply 50 and the driving chip. When the driving chip is in the abnormal pulse width state, the pulse width of the pulse signal acquired by the pin GPIO3 of the control chip from the first signal detection point a or the second signal detection point b exceeds the preset pulse width range threshold, which means that the pulse signal for driving the driving chip has a phenomenon of pulse width timeout, and in this case, the control chip can quickly output a turn-off signal to the enable pin EN of the switch detection chip through the pin GPIO2 thereof to turn off the enable pin EN, thereby cutting off the power supply between the power supply 50 and the driving chip. When the driving chip is in an overvoltage abnormal state, the input voltage of the driving chip obtained from the voltage detection point d by the control chip exceeds a preset voltage threshold, and in this case, the control chip can quickly output a turn-off signal to the enable pin EN of the switch detection chip through the self pin GPIO2 to turn off the enable pin EN, so that the power supply between the power supply 50 and the driving chip is cut off.
It should be noted that, in the present disclosure, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It should also be noted that in the present disclosure, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. The laser source protection circuit comprises a power supply and a driving circuit, wherein the driving circuit is used for driving the laser source to work; characterized by further comprising:
a pulse signal circuit for outputting a pulse signal to drive the driving circuit;
a switch detection circuit for detecting whether or not a driving current of the driving circuit is abnormal;
a control circuit for detecting whether the pulse width of the pulse signal is abnormal or not, and detecting whether the input voltage of the driving circuit is abnormal or not;
and the control circuit is connected with the switch detection circuit and is also used for controlling the switch detection circuit to cut off the electric energy supply between the power supply and the driving circuit when at least one of the driving current of the driving circuit, the pulse width of the pulse signal and the input voltage of the driving circuit is abnormal.
2. The laser source protection circuit according to claim 1, wherein the output end of the pulse signal circuit is provided with a signal detection point, and the control circuit is specifically configured to detect whether the pulse width of the pulse signal is abnormal through the signal detection point.
3. The laser source protection circuit according to claim 1, wherein the output end of the driving circuit is provided with a signal detection point, and the control circuit is specifically configured to detect whether the pulse width of the pulse signal is abnormal through the signal detection point.
4. The laser source protection circuit according to claim 1, wherein the output end of the pulse signal circuit is provided with a first signal detection point, and the output end of the driving circuit is provided with a second signal detection point; the laser source protection circuit further comprises a switch;
when the change-over switch is in a first connection state, the control circuit is connected with a first signal detection point to detect whether the pulse width of the pulse signal is abnormal or not;
when the change-over switch is in a second connection state, the control circuit is connected with the second signal detection point to detect whether the pulse width of the pulse signal is abnormal.
5. The laser source protection circuit according to claim 1, wherein the input end of the driving circuit is provided with a current detection point, and the switch detection circuit is specifically configured to detect whether the driving current of the driving circuit is abnormal through the current detection point.
6. The laser source protection circuit of claim 1, wherein the switch detection circuit comprises a power switch branch;
the power switch branch is used for adjusting the working state of the power switch branch to be in an off state according to the off signal; the off state is that the electric energy supply between the power supply and the driving circuit is disconnected, and the off signal is output by the control circuit when the driving current of the driving circuit is abnormal, and the pulse width of the pulse signal is abnormal or the input voltage of the driving circuit is abnormal.
7. The laser source protection circuit according to claim 6, wherein the switch detection circuit includes an overcurrent detection branch for detecting whether or not a driving current of the driving circuit is abnormal, and outputting an abnormality signal when the driving current of the driving circuit is abnormal;
the control circuit is specifically configured to output the shutdown signal according to the abnormal signal.
8. The laser source protection circuit according to claim 6, wherein the control circuit includes a pulse width detection branch for detecting whether a pulse width of the pulse signal is abnormal, and outputting the off signal when the pulse width of the pulse signal is abnormal.
9. The laser source protection circuit according to claim 6, wherein the control circuit includes an overvoltage detection branch for detecting whether an input voltage of the driving circuit is abnormal, and outputting the off signal when the input voltage of the driving circuit is abnormal.
10. A laser projection module comprising a laser source and a laser source protection circuit as claimed in any one of claims 1 to 9; the laser source protection circuit is used for driving the light source to emit laser and disconnecting the power supply of the power supply when the driving current of the driving circuit is abnormal, the pulse width of the pulse signal is abnormal or the input voltage of the driving circuit is abnormal.
11. A depth camera comprising a laser source and the laser source protection circuit according to any one of claims 1 to 9, wherein the laser source protection circuit is configured to drive the laser source to emit a laser beam and to disconnect the power supply of the power supply when abnormality of a driving current of the driving circuit, abnormality of a pulse width of the pulse signal, or abnormality of an input voltage of the driving circuit is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222509038.4U CN219304466U (en) | 2022-09-21 | 2022-09-21 | Laser source protection circuit, laser projection module and depth camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222509038.4U CN219304466U (en) | 2022-09-21 | 2022-09-21 | Laser source protection circuit, laser projection module and depth camera |
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| Publication Number | Publication Date |
|---|---|
| CN219304466U true CN219304466U (en) | 2023-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222509038.4U Active CN219304466U (en) | 2022-09-21 | 2022-09-21 | Laser source protection circuit, laser projection module and depth camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219304466U (en) |
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2022
- 2022-09-21 CN CN202222509038.4U patent/CN219304466U/en active Active
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