CN111781790B - Electronic device and laser unit protection method - Google Patents
Electronic device and laser unit protection method Download PDFInfo
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- CN111781790B CN111781790B CN201910268870.XA CN201910268870A CN111781790B CN 111781790 B CN111781790 B CN 111781790B CN 201910268870 A CN201910268870 A CN 201910268870A CN 111781790 B CN111781790 B CN 111781790B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Optics & Photonics (AREA)
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Abstract
The invention provides an electronic device and a laser unit protection method for protecting a laser unit of the electronic device. The method comprises the steps of sending a first current control signal to a laser power supply unit through a system control unit; providing a current to the laser unit through a first current path according to the first current control signal through the laser power supply unit, wherein a laser current monitoring unit is connected in series with the first current path; continuously detecting a current value of the current via the laser current monitoring unit; and if the current value of the current is greater than a preset threshold value, sending a second current control signal through the laser current monitoring unit to reduce the current value of the current or stop the current from being provided to the laser unit. The electronic device and the laser unit protection method used by the electronic device can effectively avoid providing excessive current to the laser unit in the electronic device.
Description
Technical Field
The present invention relates to a method for protecting a circuit element, and more particularly, to a method for protecting an electronic device and a laser unit.
Background
FIG. 6 is a block diagram of a projector according to the prior art. Referring to fig. 6, a conventional projector (e.g., a laser projector) includes a system control unit, a system power supply unit, a laser power supply circuit, a laser current control and feedback unit, and a laser circuit. Specifically, the laser unit provides a current feedback signal SB to the laser current control and feedback circuit, so that the laser current control and feedback circuit transmits a current control signal SC to the laser power supply circuit, thereby controlling the current provided by the laser power supply circuit to the laser unit; or the laser unit provides a current feedback signal SB to the laser current control and feedback circuit, so that the laser current control and feedback circuit transmits the current feedback signal SB to the system control unit, thereby controlling the system power supply unit to continue or stop providing current or voltage to the laser power supply circuit.
In addition, the laser power supply unit and the laser current control and feedback unit can be integrated into the same unit (as shown in fig. 6 as 1), that is, the laser power supply unit provides current to the laser unit through one path, and receives the current feedback signal SB generated by the laser unit through the other path. Therefore, the laser power supply unit directly receives the current feedback signal SB to adjust the magnitude of the current value of the supplied current.
However, in the conventional laser projector, only the system control unit and the laser power supply unit are used to perform feedback control, such as overcurrent monitoring or overcurrent cutoff, on the current supplied to the laser unit. However, when the system control unit or the laser power supply unit fails, the current value provided by the laser power supply unit to the laser unit exceeds the load of the laser unit, so that the laser unit emits laser with too high intensity. In this case, the laser unit may be damaged by the excessive current, and the user watching the projector may be injured by the excessively strong laser.
Therefore, how to protect the laser unit by other means is a focus of attention of those skilled in the art.
The background section is only used to help the understanding of the present invention, and therefore the disclosure in the background section may include some known techniques which are not known to those skilled in the art. The statements in the "background" section do not represent that matter or the problems which may be solved by one or more embodiments of the present invention, but are known or appreciated by those skilled in the art before filing the present application.
Disclosure of Invention
The invention provides an electronic device and a laser unit protection method used by the same, which can effectively avoid providing excessive current to a laser unit in the electronic device.
An embodiment of the invention provides an electronic device. The electronic device comprises a laser unit, a laser power supply unit, a system control unit and a laser current monitoring unit. The system power supply unit is used for providing power for the electronic device. The system control unit is used for sending a first current control signal to the laser power supply unit. The laser power supply unit is used for providing current to the laser unit through the first current path according to the first current control signal, wherein the current flows back to the laser power supply unit from the laser unit through the second current path. In addition, the laser current monitoring unit is connected in series to the first current path and is used for continuously detecting the current value of the current. If the current value of the current is larger than the preset threshold value, the laser current monitoring unit is used for sending a second current control signal so as to reduce the current value of the current or stop the current from being supplied to the laser unit.
An embodiment of the invention provides a laser unit protection method for an electronic device. The electronic device comprises a laser unit, a laser power supply unit, a system control unit and a laser current monitoring unit, wherein the system power supply unit is used for providing electric power for the electronic device. The laser power supply protection method comprises the following steps: sending a first current control signal to a laser power supply unit through a system control unit; providing a current to the laser unit through the first current path according to the first current control signal by the laser power supply unit, wherein the current flows back to the laser power supply unit from the laser unit through the second current path, and the laser current monitoring unit is connected in series with the first current path; the current value of the current is continuously detected via the laser current monitoring unit. In addition, if the current value of the current is larger than the preset threshold value, a second current control signal is sent through the laser current monitoring unit so as to reduce the current value of the current or stop the current from being supplied to the laser unit.
Based on the above, the electronic device and the laser unit protection method thereof provided by the embodiments of the invention can monitor the current provided to the laser unit of the electronic device through the laser current monitoring unit which operates independently, so as to reduce or stop the current when the current is too large, thereby preventing the laser unit of the electronic device from being damaged due to the too large current.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a block diagram of an electronic device according to an embodiment of the invention.
Fig. 2 is a block diagram of an electronic device according to another embodiment of the invention.
Fig. 3 is a flowchart illustrating a laser current protection method according to an embodiment of the invention.
Fig. 4 is a flowchart illustrating a laser current protection method according to an embodiment of the invention.
Fig. 5 is a block diagram of a laser current monitoring unit according to an embodiment of the invention.
Fig. 6 is a block diagram of a projector according to the prior art.
Detailed Description
The foregoing and other features and advantages of the invention will be apparent from the following, more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.
Fig. 1 is a block diagram of an electronic device 10 according to an embodiment of the invention.
Referring to fig. 1, an electronic device 10 includes a system power supply unit 110, a system control unit 120, a laser power supply unit 130, a laser current monitoring unit 140, and a laser unit 150. The system control unit 120 is coupled (electrically connected) to the system power supply unit 110, the laser power supply unit 130, the laser current monitoring unit 140, and the laser unit 150. In this embodiment, the electronic device 10 may be, for example, a laser projector or other electronic device including a laser element, or may be an LED projector or other electronic device including a light emitting diode.
In the present embodiment, the system control unit 120 is hardware having arithmetic capability. The system control unit 120 is used for executing one or more program codes to manage the overall operation of the electronic device 10. In the present embodiment, the system control Unit 120 is, for example, a Central Processing Unit (CPU), a Programmable microprocessor (Micro-Processor), a Digital Signal Processor (DSP), a Programmable controller, an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), or the like. The system control unit 120 is configured to send a control signal to control the system power supply unit 110 and the laser power supply unit 130, so as to adjust the output current of the laser power supply unit 130, or to stop the output current of the system power supply unit 110 or the laser power supply unit 130. For example, in fig. 1, the control signal may be used to instruct the laser power supply unit 130 to generate the current value of the current C2, or may be used to instruct the system power supply unit 110 to stop outputting the current C1.
The system power supply unit 110 is used for managing power of the electronic device 10, i.e., the system power supply unit 110 is used for providing power to the electronic device 10. The system power supply unit 110 is also used for receiving power from the outside (e.g., commercial power, or other external power). The system power supply unit 110 may have a separate internal power source, such as a battery. In addition, the system power supply unit 110 is coupled to the laser power supply unit 130, and provides a voltage V1 (not shown) to the laser power supply unit 130 to supply power, and the laser power supply unit 130 draws a required current C1 to the system power supply unit 110.
In the present embodiment, the laser power supply unit 130 is used to supply power to the laser unit 150. The system power supply unit 110 provides the electronic device with a system voltage to supply power, and the units in the electronic device draw required current to the system power supply unit 110 according to the requirement. Therefore, the laser power supply unit 130 receives the voltage V1 from the system power supply unit 110 and the current C1 from the system power supply unit 110, the system control unit 120 is configured to send the first current control signal SC1 to the laser power supply unit 130, and the laser power supply unit 130 is configured to generate the current C2 according to the first current control signal SC1 received from the system control unit 120 and provide the current C2 to the laser unit 150 through the current path CP1 (also referred to as a first current path). In another embodiment, the laser power supply unit 130 may be integrated into the system power supply unit 110, i.e., the system power supply unit 110 may generate the current C2 according to the first current control signal SC1 received from the system control unit 120.
In the present embodiment, the current C2 may flow back to the laser power supply unit 130 through the current path CP2 (also referred to as a second current path) after passing through the laser unit 150. In one embodiment, the laser power supply unit 130 may also receive a current feedback signal SB sent from the laser unit 150 to adjust the current value of the current C2 provided to the laser unit 150. In an embodiment, the laser power supply unit 130 may also receive the current feedback signal SB transmitted from the laser unit 150, and transmit information contained in the current feedback signal SB to the system control unit 120, where the information may be used to indicate that the current C2 is too large, and the system control unit 120 may transmit the third current control signal SC3 to the laser power supply unit 130 according to the information contained in the received current feedback signal SB, so that the laser power supply unit 130 adjusts the current value of the current C2 provided to the laser unit 150. Briefly, the laser power supply unit 130 is configured to receive an input current C1 and output a corresponding current C2 according to a received first current control signal SC 1.
In this embodiment, the electronic device 10 may be a projection device, and the projection device is used for receiving image data (e.g., image data received from a data terminal or image data of a user interface generated by the system control unit 120) and projecting an image beam according to the image data to form a projection image on a projection plane. The projection apparatus includes a light source module (including a laser unit 150), an optical engine, and a projection lens. The light source module can emit an illumination beam through at least the laser unit 150, the optical engine converts the illumination beam into an image beam based on the image data, and the projection lens projects the image beam onto a projection plane to form a projection image. The optical engine may include a light valve, such as, but not limited to, a Digital Micro-mirror Device (DMD), a Liquid Crystal On Silicon (LCOS), or a Liquid Crystal Display Panel (LCD Panel).
In the present embodiment, the laser current monitoring unit 140 is connected in series to the first current path CP1. For example, the laser current monitoring unit 140 may be coupled to a node N1 (also referred to as a first node) on the first current path CP1. The first node N1 may be disposed at any position on the first current path CP1. The laser current monitoring unit 140 is configured to monitor a current value of the current C2 flowing through the first node N1, and determine whether to decrease the current value of the current C2 or stop the current C2 according to the monitored current value of the current C2.
Fig. 2 is a block diagram of a laser current monitoring unit 140 according to an embodiment of the invention. In the present embodiment, the laser current monitoring unit 140 includes a current detecting unit 141 and a current managing unit 142. The current detection unit 141 is connected in series to the first current path CP1 to form a first node N1. The current detection unit 141 may be configured to continuously detect a current value of the current C2 and transmit the detected current value of the current C2 to the current management unit 142. The current detecting unit 141 may be any circuit structure or element capable of monitoring the magnitude of the current value in the current path, for example, measuring the voltage across a resistor connected in series on the first current path CP1 to estimate the magnitude of the current, or implemented by a Hall current sensor (Hall-based current sensor) or a channel type Hall current sensor, which is not limited to the invention. It should be noted that when the current sensing is implemented by means of a hall current sensor, the first node N1 does not have to be a node where actual lines intersect.
Specifically, the current management unit 142 is coupled to the current detection unit 141. The current managing unit 142 is configured to determine whether the current value of the current C2 is greater than a preset threshold according to the current value of the current C2 received from the current detecting unit 141. The current management unit 142 is further configured to generate a second current control signal SC2 according to the determination result. The second current control signal SC2 is provided to the system control unit 120 to control the laser power supply unit 130 to reduce the current value of the current C2 or stop providing the current C2, or to control the system power supply unit 110 to stop providing the current C1. Please refer to fig. 1, fig. 3 and fig. 4 for details of the function of the laser current monitoring unit and the method for protecting the laser unit according to the embodiment of the present invention.
Fig. 3 is a flowchart illustrating a laser current protection method according to an embodiment of the invention. Referring to fig. 3, in step S31, the system control unit 120 sends a first current control signal SC1 to the laser power supply unit 130. Next, in step S32, the laser power supply unit 130 provides a current C2 to the laser unit 150 through a first current path CP1 according to the first current control signal SC 1.
In step S33, the laser current monitoring unit 140 continuously detects the current value of the current C2. Specifically, step S33 is continuously executed (e.g., once every fixed predetermined period) to achieve the purpose of immediately controlling the current value of the current C2 not to exceed the preset threshold.
In step S34, the laser current monitoring unit 140 determines whether the current value of the current C2 is greater than a preset threshold value. Specifically, the preset threshold is set according to the specification of the laser unit 150 or the output brightness specification of the projection apparatus. That is, when the laser current monitoring unit 140 detects that the current value of the current C2 exceeds the preset threshold, the laser unit 150 may be damaged, or the projection apparatus (the laser unit 150) outputs an excessively bright image beam, so that the observer may be injured by excessively strong laser.
In response to determining that the current value of the current C2 is not greater than the preset threshold, the process returns to step S33; in response to determining that the current value of the current C2 is greater than the predetermined threshold, step S35 is continued, and the laser current monitoring unit 140 sends a second current control signal SC2 to the laser power supply unit 130 or the system control unit 120, so that the laser power supply unit 130 reduces the current value of the current C2 or stops the current from being supplied to the laser unit.
In an embodiment, the operation of step S35 may include one of the following embodiments (A1) and (A2) to stop providing the current C1 or the current C2.
Embodiment (A1): the current management unit 142 may send a second current control signal SC2 to the laser power supply unit 130 or the system power supply unit 110 to instruct the laser power supply unit 130 or the system power supply unit 110 to stop supplying the current (e.g., the laser power supply unit 130 may stop supplying the current C2, or the system power supply unit 110 may stop supplying the current C1). That is, in the embodiment (A1), the second current control signal SC2 is used to instruct the circuit element receiving the second current control signal SC2 to stop providing the current to be transmitted.
Embodiment (A2): the current managing unit 142 sends a second current control signal SC2 to the system control unit 120. The second current control signal SC2 is used to indicate that the current value of the current C2 is greater than the preset threshold. The system control unit 120 sends a third current control signal SC3 to the laser power supply unit 130 or the system power supply unit 110 according to the received second current control signal SC2, so as to instruct the laser power supply unit 130 or the system power supply unit 110 to stop supplying the current C1 or the current C2. That is, in the embodiment (A2), the third current control signal SC3 is used to instruct the circuit element receiving the third current control signal SC3 to stop providing the current to be transmitted originally.
On the other hand, the system power supply unit 110 may stop providing the current C1 by stopping the system power supply unit 110 from providing the voltage V1 of the system power supply unit 110 or changing the voltage V1 to the ground voltage (0 volt).
In an embodiment, the operation of the step S35 may include one of the following embodiments (B1) and (B2) to reduce the current value of the current C2.
Embodiment (B1): the current management unit 142 sends a second current control signal SC2 to the laser power supply unit 130 to instruct the laser power supply unit 130 to decrease the current value of the current (e.g., the laser power supply unit 130 may decrease the current value of the supplied current C2). That is, in the embodiment (B1), the second current control signal SC2 is used to instruct the circuit element receiving the second current control signal SC2 to decrease the current value of the current originally supplied.
Embodiment (B2): the current managing unit 142 sends a second current control signal SC2 to the system control unit 120, wherein the second current control signal SC2 is used for indicating that the current value of the current is greater than the preset threshold. The system control unit 120 sends a third current control signal SC3 to the laser power supply unit 130 according to the received second current control signal SC2, so as to instruct the laser power supply unit 130 to decrease the current value of the current C2. That is, in the embodiment (B2), the third current control signal SC3 is used to instruct the circuit element receiving the third current control signal SC3 to reduce the supply current to be transmitted.
The circuit element receiving the second/third current control signal SC2/SC3 in the embodiments (A1), (A2), (B1), (B2) may be any device or circuit that is operated to affect the supply of the current C1 or the current C2, for example, the circuit element may be connected in series to the path of the laser power supply unit 130 receiving the voltage V1 from the system power supply unit 110 to turn off the laser power supply unit 130; or a switch for shunting current C2, the actual current flowing into laser unit 150 may be temporarily reduced.
In addition, in order to avoid that the current C2 cannot be effectively reduced, in the examples corresponding to the embodiments (B1) and (B2), the supplied current C2 may be directly stopped according to the reduction count value corresponding to the transmitted second current control signal SC2. This is explained in detail below with reference to fig. 4.
Fig. 4 is a flowchart illustrating a laser current protection method according to an embodiment of the invention. Referring to fig. 4, steps S31 to S34 are the same as steps S31 to S34 in fig. 3, and are not described herein again.
In response to determining that the current value of the current C2 is greater than the predetermined threshold (step S34 → yes), the laser current monitoring unit 140 (the current management unit 142) determines whether the current reduction count value is greater than the reduction count threshold in step S351. Specifically, the initial value of the reduction number is zero, and the current management unit 142 accumulates the reduction number (e.g., adds one) each time the current management unit 142 sends the second current control signal SC2. That is, according to the value of the reduction count value, the current management unit 142 may know the total number of times that the current management unit 142 has transmitted the second current control signal SC2 before the time point when the current value of the current C2 is determined to be greater than the preset threshold value this time. The designer or manufacturer may set the reduction number threshold according to the requirement.
In response to determining that the reduction count value of the current is not greater than the reduction count threshold (step S351 → no), continuing to step S352, the current management unit 142 sends the second current control signal SC2 to reduce the current value of the current C2, and accumulates the reduction count value. Details of step 352 have already been described in the above embodiments (B1) and (B2) of step S35, and are not described herein again.
Then, the flow returns to step S33. That is, the laser current monitoring unit 140 may continue to detect the current value of the current C2 to determine whether the current value of the current C2 is greater than the predetermined threshold again, and further may identify whether the transmitted second current control signal SC2 is active (i.e., determine whether the current value of the current C2 is decreased by the transmitted second current control signal SC 2).
In response to determining that the decreasing number of times of the current is greater than the decreasing number threshold (step S351 → yes), continuing to step S353, the current management unit 142 sends a fourth current control signal SC4, wherein the fourth current control signal SC4 is used for instructing to stop providing the current C1 or the current C2. Specifically, the fourth current control signal SC4 may be sent to the laser power supply unit 130 or the system power supply unit 110 to instruct the laser power supply unit 130 or the system power supply unit 110 to stop supplying the current (e.g., the laser power supply unit 130 may stop supplying the current C2, and the system power supply unit 110 may stop supplying the current C1). In one embodiment, the current management unit 142 sends the fourth current control signal SC4 to the system control unit 120, and the system control unit 120 can send a command to stop the current supply to the laser power supply unit 130 or the system power supply unit 110, so that the laser power supply unit 130 stops providing the current C2 or the system power supply unit 110 stops providing the current C1 or the voltage V1. The fourth current control signal SC4 is the same as the second current control signal SC2 in the above embodiments (A1) and (A2), and details thereof are not repeated here.
On the other hand, in response to determining that the current value of the current C2 is not greater than the preset threshold value (step S34 → no), the current management unit 142 resets the reduction number value to zero in step S354. That is, when the current management unit 142 determines that the current value of the current C2 is not greater than the predetermined threshold, the decrement count value is reset to zero to avoid continuing to accumulate the decrement count value, so as to avoid the unexpected operation of step S353 since the decrement count value is accumulated until the decrement count value exceeds the decrement count threshold. After resetting the number of times of reduction to zero, the flow returns to step S33.
Fig. 5 is a block diagram of an electronic device according to another embodiment of the invention. Referring to fig. 5, different from fig. 1, the electronic device 10 of fig. 5 further includes a current cut-off unit 160. In this another embodiment, the current cut-off unit 160 is disposed on the second node N2 in the first current path CP1. The second node N2 is located between the first node N1 and the laser unit 150.
The current cut-off unit 160 may cut off the first current path CP1 according to a current value of the current C2 greater than a predetermined value (also referred to as a cut-off threshold).
Specifically, in response to the current management unit 160 monitoring that the current value of the current is greater than a cut-off threshold, the current cut-off unit 160 opens the first current path CP1 to stop the current from being supplied to the laser unit 150. The cutoff threshold is greater than the predetermined threshold. The current cut-off unit 160 is a circuit element such as a fuse or a thermistor (PCT), and is disposed on the first current path (which is a part of the first current path) to let the current C2 pass through. However, when the current value of the passing current C2 is greater than the cut-off threshold, the current cut-off unit 160 is blown to disconnect the first current path, thereby preventing the current C2 from flowing to the laser unit 150.
In summary, the electronic device and the laser unit protection method thereof provided by the embodiments of the invention can monitor the current provided to the laser unit of the electronic device through the laser current monitoring unit operating independently, so as to reduce or stop the current when the current is too large, thereby preventing the laser unit of the electronic device from being damaged due to the too large current.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Description of reference numerals:
10: electronic device
110: system power supply unit
120: system control unit
130: laser power supply unit
140: laser current monitoring unit
141: current detection unit
142: current management unit
150: laser unit
160: current cut-off unit
N1, N2: node point
C1, C2: electric current
CP1, CP2: current path
SB: current feedback signal
SC, SC1, SC2, SC3, SC4: current control signal
S31, S32, S33, S34, S35: process steps of laser unit protection method
S31, S32, S33, S34, S351, S352, S353, S354: the process steps of the laser unit protection method.
Claims (6)
1. An electronic device, comprising a system power supply unit, a system control unit, a laser power supply unit, a laser unit, a current cut-off unit and a laser current monitoring unit, wherein the laser current monitoring unit comprises a current detection unit and a current management unit, wherein:
the system power supply unit is used for providing the electronic device power;
the system control unit is used for sending a first current control signal to the laser power supply unit;
the laser power supply unit is used for providing current to the laser unit through a first current path according to the first current control signal, wherein the current flows back to the laser power supply unit from the laser unit through a second current path; and
the laser current monitoring unit is connected in series with the first current path,
the laser current monitoring unit is used for continuously detecting the current value of the current,
wherein if the current value of the current is greater than a preset threshold, the laser current monitoring unit is configured to send a second current control signal to reduce the current value of the current or stop the current from being supplied to the laser unit,
the current detection unit is connected in series on a first current path to form a first node, and the current detection unit is used for continuously detecting the current value of the current;
the current management unit is coupled to the current detection unit, wherein the current management unit is configured to determine whether the current value of the current is greater than the preset threshold,
wherein the current management unit is further configured to generate the second current control signal, and the current management unit is configured to send the second current control signal to the system control unit, wherein the system control unit sends a third current control signal to the laser power supply unit or the system power supply unit according to the received second current control signal, so as to instruct the laser power supply unit or the system power supply unit to stop providing the current,
wherein the current cut-off unit is connected in series on the first current path to form a second node, wherein the second node is located between the first node and the laser unit,
wherein the current cutoff unit is to disconnect the first current path to stop the current from being provided to the laser unit in response to the current management unit monitoring that the current value of the current is greater than a cutoff threshold, wherein the cutoff threshold is greater than the preset threshold,
each time the current management unit sends a second current control signal, the current management unit accumulates a reduction count value,
wherein after the current management unit sends the second current control signal, the current management unit performs the above-mentioned step of determining whether the current value of the current is greater than the preset threshold value again,
wherein when the reduction number value is greater than a reduction number threshold and it is determined that the current value of the current is greater than the preset threshold, the current management unit sends a fourth current control signal to one of the laser power supply unit or the system power supply unit, wherein the fourth current control signal is used to instruct to stop supplying the current,
if the current value of the current is not greater than the preset threshold, the laser current monitoring unit does not reduce the current value of the current or does not stop the current from being supplied to the laser unit.
2. The electronic device according to claim 1, wherein the laser current monitoring unit is configured to send the second current control signal to reduce the current value of the current or stop the current from being supplied to the laser unit,
the current management unit sends the second current control signal to the laser power supply unit to instruct the laser power supply unit to reduce the current value of the current.
3. The electronic device of claim 2,
when the current management unit determines that the current value of the current is not greater than the preset threshold value, the current management unit resets the reduction number value to zero.
4. A laser unit protection method is used for an electronic device, wherein the electronic device comprises a system power supply unit, a system control unit, a laser power supply unit, a laser unit, a current cut-off unit and a laser current monitoring unit, the laser current monitoring unit comprises a current detection unit and a current management unit, the system power supply unit is used for providing power for the electronic device, and the laser power supply protection method comprises the following steps:
sending a first current control signal to the laser power supply unit via the system control unit;
providing a current to the laser unit via a first current path according to the first current control signal via the laser power supply unit, wherein the current flows back from the laser unit to the laser power supply unit via a second current path, wherein the laser current monitoring unit is connected in series to the first current path;
continuously detecting a current value of the current via the laser current monitoring unit; and
sending a second current control signal via the laser current monitoring unit to reduce the current value of the current or stop the current from being supplied to the laser unit if the current value of the current is greater than a preset threshold value,
the current detection unit is connected in series on a first current path to form a first node for executing the step of continuously detecting the current value of the current;
the current management unit is coupled to the current detection unit, wherein the current management unit is configured to perform a step of determining whether the current value of the current is greater than the preset threshold,
sending, by the current management unit, the second current control signal to the system control unit, wherein the second current control signal is used to indicate that the current value of the current is greater than the preset threshold, and sending, by the system control unit, a third current control signal to the laser power supply unit or the system power supply unit according to the received second current control signal to instruct the laser power supply unit or the system power supply unit to stop providing the current,
wherein the current cut-off unit is connected in series on the first current path to form a second node, wherein the second node is located between the first node and the laser unit,
in response to the current management unit monitoring that the current value of the current is greater than a cut-off threshold value, via the current cut-off unit, disconnecting the first current path to stop the current from being provided to the laser unit, wherein the cut-off threshold value is greater than the preset threshold value,
accumulating, via the current management unit, a reduction count value each time the current management unit transmits the second current control signal,
after the current management unit sends the second current control signal, the current management unit re-executes the step of judging whether the current value of the current is greater than the preset threshold value,
sending a fourth current control signal to one of the laser power supply unit or the system power supply unit via the current management unit when the reduction number value is greater than a reduction number threshold and it is determined that the current value of the current is greater than the preset threshold, wherein the fourth current control signal is used for instructing to stop supplying the current,
if the current value of the current is not greater than the preset threshold, not reducing the current value of the current or not stopping the current from being supplied to the laser unit.
5. The laser unit protection method according to claim 4, wherein the step of the laser current monitoring unit sending the second current control signal to reduce the current value of the current or stop the current from being supplied to the laser unit comprises:
sending the second current control signal to the laser power supply unit via the current management unit to instruct the laser power supply unit to reduce the current value of the current.
6. The laser unit protection method according to claim 4,
resetting the reduction number value to zero via the current management unit when the current management unit determines that the current value of the current is not greater than the preset threshold value.
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