CN112198746B - Laser light source drive circuit and system - Google Patents
Laser light source drive circuit and system Download PDFInfo
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- CN112198746B CN112198746B CN201910610406.4A CN201910610406A CN112198746B CN 112198746 B CN112198746 B CN 112198746B CN 201910610406 A CN201910610406 A CN 201910610406A CN 112198746 B CN112198746 B CN 112198746B
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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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- 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
- G03B21/206—Control of light source other than position or intensity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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Abstract
The invention is suitable for the technical field of laser projection display, and provides a laser light source driving circuit and a system, which can realize monitoring and feedback control of working parameters of a laser light source, protect the laser light source from being damaged, reduce the damage risk of the laser light source, improve the driving reliability and further improve the overall performance of the system.
Description
Technical Field
The invention belongs to the technical field of laser projection display, and particularly relates to a laser light source driving circuit and a laser light source driving system.
Background
The laser projection display technology is a fourth generation display technology following black and white display, color display, and digital display. Among the numerous display technologies that are being developed, the laser display technology represents the trend and the mainstream direction of the future development of the display technology, and is the focus of competition in the future display field. How to effectively drive and control the laser light source meeting the technical requirements of laser projection display, the laser light source is protected from being damaged, the damage risk of the laser light source is reduced, the driving reliability is improved, and the overall performance of the system is further improved, so that the problem to be solved is urgent.
Disclosure of Invention
Embodiments of the present invention provide a laser light source driving circuit and system to solve at least one of the above problems.
A first aspect of an embodiment of the present invention provides a laser light source driving circuit, including a control module, at least one driving module, and at least one monitoring module;
the control module is respectively electrically connected with each driving module and each monitoring module, each driving module, each monitoring module and each laser light source module correspond to each other in pairs, and the driving modules and the monitoring modules are used for being electrically connected with the corresponding laser light source modules;
the control module is used for outputting a control signal to the driving module, the driving module is used for entering a working state according to the control signal and lighting the corresponding laser light source module, and the monitoring module is used for collecting working parameters of the corresponding laser light source module and feeding the working parameters back to the control module.
In one embodiment, the driving module includes a driving unit, a power supply unit, and a voltage sampling unit;
the driving unit is electrically connected with the control module, the power supply unit and the voltage sampling unit, and the power supply unit is electrically connected with the voltage sampling unit and is used for being electrically connected with a power supply positive end of the laser light source module corresponding to the driving module;
the driving unit is used for entering a working state according to the driving enabling control signal output by the control module and controlling the power supply unit to output a light source driving power supply according to the light source power supply control signal output by the control module;
the voltage sampling unit is used for sampling the voltage parameter of the light source driving power supply and sending the voltage parameter to the driving unit;
the driving unit is further used for controlling the power supply unit to adjust the voltage of the light source driving power supply according to the voltage parameter, so that the voltage of the light source driving power supply is smaller than or equal to the rated working voltage of the laser light source module corresponding to the driving module.
In one embodiment, the driving module comprises a driving unit, a power supply unit and a current sampling unit;
the driving unit is electrically connected with the control module, the power supply unit and the current sampling unit, the power supply unit is electrically connected with the current sampling unit, and the current sampling unit is used for being electrically connected with a power supply positive end of the laser light source module corresponding to the driving module;
the driving unit is used for entering a working state according to the driving enabling control signal output by the control module and controlling the power supply unit to output a light source driving power supply according to the light source power supply control signal output by the control module;
the current sampling unit is used for sampling the current parameter of the light source driving power supply and sending the current parameter to the driving unit;
the driving unit is further used for controlling the power supply unit to adjust the current of the light source driving power supply according to the current parameter, so that the current of the light source driving power supply is smaller than or equal to the rated working current of the three-base laser light source module corresponding to the driving module.
In one embodiment, the driving module includes a driving unit and a switching unit;
the driving unit is electrically connected with the control module and the switch unit, and the switch unit is electrically connected with the monitoring module corresponding to the driving module and is used for being electrically connected with the power supply negative end of the laser light source module corresponding to the driving module;
the driving unit is used for entering a working state according to the driving enabling control signal output by the control module and controlling the switch unit to be switched on or switched off according to the light source enabling control signal output by the control module;
the switch unit is used for switching on the electric connection between the monitoring module corresponding to the driving module and the power supply negative end of the laser light source module when the switch unit is conducted, so that the laser light source module corresponding to the driving module is lightened; and the switch unit is also used for disconnecting the electric connection between the monitoring module corresponding to the driving module and the power supply negative end of the laser light source module when the laser light source module is disconnected, so that the laser light source module corresponding to the driving module is extinguished.
In one embodiment, the monitoring module comprises a monitoring unit and an analog-to-digital conversion unit;
the monitoring unit is electrically connected with the analog-to-digital conversion unit and the driving module corresponding to the monitoring module, and the analog-to-digital conversion unit is electrically connected with the control module;
the monitoring unit is used for monitoring a working temperature parameter when the laser light source module corresponding to the monitoring module is lightened, obtaining a working current parameter and a working voltage parameter according to an output power supply of the laser light source module corresponding to the monitoring module, and outputting the working temperature parameter, the working current parameter and the working voltage parameter to the analog-to-digital conversion unit;
the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the working temperature parameter, the working current parameter and the working voltage parameter and outputting the analog-to-digital conversion to the control module.
In one embodiment, the monitoring unit comprises a temperature monitoring subunit, a current sampling subunit and a voltage sampling subunit, and the analog-to-digital conversion unit comprises a first analog-to-digital conversion subunit, a second analog-to-digital conversion subunit and a third analog-to-digital conversion subunit;
the current sampling subunit and the voltage sampling subunit are electrically connected with a driving module corresponding to the monitoring module, the first analog-to-digital conversion unit is electrically connected with the temperature monitoring subunit and the control module, the second analog-to-digital conversion unit is electrically connected with the current sampling subunit and the control module, and the third analog-to-digital conversion unit is electrically connected with the voltage sampling subunit and the control module;
the temperature monitoring subunit is used for monitoring a working temperature parameter when the three-base laser light source module corresponding to the monitoring module is lightened and outputting the working temperature parameter to the first analog-to-digital conversion subunit;
the current sampling subunit is used for obtaining working current parameters according to an output power supply of the three-base laser light source module corresponding to the monitoring module and outputting the working current parameters to the second analog-to-digital conversion subunit;
the voltage sampling subunit is used for obtaining working voltage parameters according to the output power supply of the three-base laser light source module corresponding to the monitoring module and outputting the working voltage parameters to the third analog-to-digital conversion subunit;
the first analog-to-digital conversion subunit is used for performing analog-to-digital conversion on the working temperature parameter and outputting the working temperature parameter to the control module;
the second analog-to-digital conversion subunit is used for performing analog-to-digital conversion on the working current parameter and outputting the working current parameter to the control module;
and the third analog-to-digital conversion subunit is used for performing analog-to-digital conversion on the working voltage parameter and outputting the working voltage parameter to the control module.
In one embodiment, the laser light source driving circuit further comprises a first driving buffer module and a second driving buffer module;
the first driving buffer module and the second driving buffer module are electrically connected with the main control module and the driving module;
the control module is used for outputting a light source enabling control signal to the driving module through the first driving buffer module, and the first driving buffer module is used for temporarily storing the light source enabling control signal;
the control module is further configured to output a light source power control signal to the driving module through the second driving buffer module, and the second driving buffer module is configured to temporarily store the light source power control signal.
In one embodiment, the laser light source driving circuit further comprises at least one fan driving module;
the fan driving module is electrically connected with the control module and at least one fan, and one fan driving module corresponds to at least one laser light source module;
the control module is used for controlling the fan driving module corresponding to the laser light source module to drive at least one fan to start or close according to the working temperature parameter of the laser light source module.
In one embodiment, the laser light source module comprises at least one laser light source unit, and the laser light source unit comprises at least one laser light source;
the at least one laser light source unit is connected in series or in parallel, and the at least one laser light source unit is connected in series.
A second aspect of the embodiments of the present invention provides a laser light source driving system, including a digital light processing module and the laser light source driving circuit;
the digital light processing module is electrically connected with the control module;
the digital light processing module is used for outputting a control signal to the control module;
the control module is used for outputting the control signal output by the digital light processing module to the driving module, or directly outputting the control signal to the driving module;
the priority of the control signal output by the digital light processing module is higher than that of the control signal output by the control module.
In one embodiment, the laser light source driving circuit further comprises an or module electrically connected with the control module, the driving module and the digital light processing module;
the digital light processing module and the control module are used for outputting control signals to the OR module and outputting the control signals to the driving module through the OR module.
In one embodiment, the laser light source driving system further comprises a display control module;
the display control module is electrically connected with the digital light processing module and the control module;
the display control module is used for controlling the working states of the digital light processing module and the laser driving circuit and displaying the working parameters of the laser light source module.
The embodiment of the invention provides a laser light source driving circuit comprising a control module, at least one driving module and at least one monitoring module, wherein the control module is electrically connected with each driving module and each monitoring module respectively, one driving module corresponds to one monitoring module, and one driving module and one corresponding monitoring module are used for being electrically connected to the same corresponding laser light source module; control signals are output to the driving module through the control module, the driving module enters the working state according to the control signals and lights the corresponding laser light source modules, the working parameters of the corresponding laser light source modules are collected through the monitoring module and fed back to the control module, monitoring and feedback control over the working parameters of the laser light source can be achieved, the laser light source is protected from being damaged, the risk of damage to the laser light source is reduced, the driving reliability is improved, and the overall performance of the system is further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a laser light source driving circuit according to a first embodiment of the present invention;
FIG. 2 is a waveform diagram of a light source enable control signal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a laser light source driving circuit according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a first structure of a laser light source driving circuit according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of a second structure of a laser light source driving circuit according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of a third structure of a laser light source driving circuit according to a third embodiment of the present invention;
fig. 7 is a schematic diagram of a fourth structure of a laser light source driving circuit according to a third embodiment of the present invention;
fig. 8 is a schematic diagram of a fifth structure of a laser light source driving circuit according to a third embodiment of the present invention;
fig. 9 is a schematic view of a first structure of a laser light source module according to a third embodiment of the present invention;
fig. 10 is a schematic view of a second structure of a laser light source module according to a third embodiment of the present invention;
fig. 11 is a schematic structural diagram of a laser light source module according to a third embodiment of the present invention;
fig. 12 is a schematic structural diagram of a laser light source driving system according to a fourth embodiment of the present invention;
fig. 13 is a schematic structural diagram of a laser light source driving system according to a fifth embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Example one
As shown in fig. 1, the present embodiment provides a laser light source driving circuit 100, which includes a control module 10, at least one driving module (respectively denoted as a driving module 21, a driving module 22, … …, and a driving module 2N), and at least one monitoring module (respectively denoted as a monitoring module 31, a monitoring module 32, a monitoring module … …, and a monitoring module 3N); wherein N is not less than 1 and N is an integer.
As shown in fig. 1, in the present embodiment, the control module 10 is electrically connected to the driving modules 21 to 2N and the monitoring modules 31 to 3N, each of the driving modules, each of the monitoring modules and each of the laser source modules correspond to each other, and the driving modules and the monitoring modules are used to be electrically connected to the corresponding laser source modules (fig. 1 exemplarily shows that the driving module 21 and the monitoring module 31 are electrically connected to the laser source module 1, the driving module 22 and the monitoring module 32 are electrically connected to the laser source module 2, and … … shows that the driving module 2N and the monitoring module 3N are electrically connected to the laser source module N).
In the embodiment, the control module 10 is configured to output a control signal to the driving modules 21-2N, and the driving modules 21-2N are configured to enter a working state or a shutdown state according to the control signal. Specifically, the control module 10 is configured to output a driving enable control signal, a light source enable control signal, and a light source power control signal to the driving modules 21-2N; the driving enabling control signal is used for controlling the driving modules 21-2N to enter a working state or a closing state.
In a Specific Application, the control module may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The control module is internally provided with a control kernel, a crystal oscillator and an I/O resource minimum system module. The control module can be electrically connected with the monitoring modules through an I2C bus, and the communication mode between the control module and each monitoring module is a master-slave communication mode based on a master-slave communication protocol.
In specific application, the driving enabling control signal is a level signal for controlling the driving module to enter a working state or a closing state, and the driving enabling control signal can be set to be active at a high level or active at a low level according to actual needs; when the high level is effective, the driving enabling control signal is a high level signal and is used for controlling the driving module to enter a working state, and the driving enabling control signal is a low level signal and is used for controlling the driving module to enter a closing state; when the low level is effective, the driving enabling control signal is a low level signal and is used for controlling the driving module to enter a working state, and the driving enabling control signal is a high level signal and is used for controlling the driving module to enter a closing state.
In a specific application, the laser light source module is a three-primary-color (R (red), G (green), and B (blue)) laser light source module, and includes a three-primary-color laser light source. The light source enabling control signal is a Pulse Width Modulation (PWM) signal for controlling the on/off of the three-primary-color laser light sources, and the time proportion of the signal for controlling R, G, B three-color laser light sources in the light source enabling control signal can be set according to actual needs.
As shown in fig. 2, a waveform diagram of a light source enable control signal is exemplarily shown; in fig. 2, the time ratio of signals for controlling R, G, B laser light sources of three colors in the light source enable control signal is 1:1:1, R _ EN represents a waveform corresponding to a red laser light source in the light source enable control signal, G _ EN represents a waveform corresponding to a green laser light source in the light source enable control signal, and B _ EN represents a waveform corresponding to a blue laser light source in the light source enable control signal.
In specific application, R, G, B laser light sources of three colors can be turned on according to the duty ratio shown in fig. 2 or other duty ratios, and laser light sources of any color can also be turned on or off continuously, so that the on-off state of the laser light sources of three colors can be controlled in a self-defined manner, and the characteristics of the laser light sources can be conveniently researched.
In a specific application, the light source power control signal is a pulse width modulation signal for controlling the brightness of the laser light sources when being turned on, and the brightness of the laser light sources of each color when being turned on can be changed by changing the voltage of the signal corresponding to the laser light sources of each color in the light source power control signal.
In a specific application, the driving enable control signal, the light source enable control signal and the light source power supply control signal are output by an I/O interface of the control module.
In this embodiment, each driving module is configured to enter a working state or a shutdown state according to a driving enable control signal; when the driving module enters a working state, controlling the corresponding laser light source module to be turned on or turned off according to the light source enabling control signal, and outputting a light source driving power supply to the corresponding laser light source module according to the light source power supply control signal;
when each laser light source module is lightened, the laser light source module sends out a laser signal with brightness corresponding to the light source driving power supply.
In specific application, the control module can only lead out a drive enabling control signal line, a light source enabling control signal line and a light source power supply control signal line, the three signal lines are electrically connected with each drive module and used for controlling signals of different drive modules to execute corresponding operations to be distinguished through the time sequence of the signals, namely, the communication mode between the control module and at least one drive module can be master-slave communication, and a master-slave communication protocol is adopted to transmit the signals; the control module can also be led out with N drive enabling control signal lines, N light source enabling control signal lines and N light source power supply control signal lines, and each drive module is independently connected with one drive enabling control signal, one light source enabling control signal and one light source power supply control signal, so that signals do not need to be distinguished in time sequence, and the signal transmission efficiency and accuracy can be effectively improved.
Fig. 1 exemplarily shows a case where only one driving enable control signal line, one light source enable control signal line, and one light source power supply control signal line are led out from the control module 10.
In a specific application, the voltage of the light source driving power supply is positively correlated with the brightness of the corresponding laser light source module.
In this embodiment, each monitoring module is configured to monitor a working parameter when the corresponding laser light source module is turned on and output the working parameter to the control module 10. Specifically, each monitoring module is configured to monitor a working temperature parameter when the corresponding laser light source module is turned on, obtain a working current parameter and a working voltage parameter according to an output power source of the corresponding laser light source module, and feedback and output the working temperature parameter, the working current parameter, and the working voltage parameter to the control module 10.
In this embodiment, the control module 10 is further configured to control the driving module to feedback control the working parameters of the corresponding laser light source module according to the working parameters when each laser light source module is turned on. Specifically, the control module 10 is further configured to adjust the driving enable control signal, the light source enable control signal and the light source power control signal according to the working temperature parameter, the working current parameter and the working voltage parameter output by the monitoring module, so as to feedback-control the working parameter of the corresponding laser light source module through the driving module.
In specific application, the monitoring module can be realized by a temperature sensor, a current sampling circuit and a voltage sampling circuit, and the feedback control of the working parameters of the laser light source module can be realized by monitoring the working temperature parameters, the working current parameters and the working voltage parameters of the laser light source module and outputting the parameters to the control module.
In a specific application, the laser light source module comprises at least one laser light source, and the laser light source can be a three-primary-color laser light source.
In this embodiment, by providing a laser light source driving circuit including a control module, at least one driving module and at least one monitoring module, the control module is electrically connected to each driving module and each monitoring module, so that a driving module, a monitoring module and a laser light source module correspond to each other in pairs, and the driving module is used for being electrically connected to the corresponding laser light source module; control signals are output to the driving module through the control module, the driving module enters the working state according to the control signals and lights the corresponding laser light source modules, the working parameters of the corresponding laser light source modules are collected through the monitoring module and fed back to the control module, monitoring and feedback control over the working parameters of the laser light source can be achieved, the laser light source is protected from being damaged, the risk of damage to the laser light source is reduced, the driving reliability is improved, and the overall performance of the system is further improved.
Example two
As shown in fig. 3, in this embodiment, the laser light source driving circuit 100 in the first embodiment further includes a first driving buffer module 40 and a second driving buffer module 50;
the first driving buffer module 40 and the second driving buffer module 50 are electrically connected with the main control module 10 and the driving modules 21-2N.
In this embodiment, the control module 10 outputs the light source enable control signal to the driving modules 21 to 2N through the first driving buffer module 40, and the first driving buffer module 40 is used for temporarily storing the light source enable control signal;
the control module 10 outputs the light source power control signal to the driving modules 21 to 2N through the second driving buffer module 50, and the second driving buffer module 50 is used for temporarily storing the light source power control signal.
In specific application, the first driving buffer module and the second driving buffer module can be buffers or buffer chips, the number of the first driving buffer modules is equal to the number of the light source enabling control signal lines led out by the control module, and the number of the second driving buffer modules is equal to the number of the light source power supply control signal lines led out by the control module.
As shown in fig. 3, in the present embodiment, the laser light source driving circuit 100 in the first embodiment further includes at least one fan driving module (only one fan driving module 60 is exemplarily shown in fig. 3);
the fan driving modules 60 are electrically connected to the control module 10 and at least one fan (not shown in fig. 3), and one fan driving module 60 corresponds to at least one laser light source module.
In specific application, the number of the fan driving modules and the number of the fans can be set according to actual needs, specifically, the number of the laser light source modules and the number of the heating values can be set according to actual needs, and the number of the laser light source modules and the number of the heating values are positively correlated with the number of the fan driving modules and the number of the fans. The fan drive module may be a dc drive motor.
In this embodiment, the control module 10 is further configured to control the fan driving module 60 corresponding to the laser light source module to drive at least one fan to start or stop according to the operating temperature parameter of the laser light source module.
In specific application, one laser light source module corresponds to at least one fan, the fan is arranged near the laser light source module, the control module is used for driving the fan arranged near the laser light source module to start working through the fan driving module corresponding to the laser light source module when the working temperature parameter of the laser light source module is larger than a preset working temperature threshold value, and the working power of the fan is positively correlated with the working temperature parameter of the laser light source module and is smaller than or equal to the rated working power of the fan.
In the embodiment, the first drive buffer module is arranged in the laser light source drive circuit and used for temporarily storing the light source enable control signal, and the second drive buffer module is arranged for temporarily storing the light source power supply control signal, so that the working speeds of the control module working at a high speed and the drive module working at a low speed can be coordinated, and the synchronization of data transmission between the control module and the drive module is realized; the fan driving module is used for driving the fan to work, the working temperature of the laser light source module can be reduced, the damage risk of the laser light source is reduced, and the stability of the laser light source is improved.
EXAMPLE III
In the embodiment, any one of the driving modules 21-2N comprises a driving unit, a power supply unit and at least one of a voltage sampling unit, a current sampling unit and a switch unit.
In one embodiment, any one of the driving modules 21-2N comprises a driving unit, a power supply unit and a voltage sampling unit.
For convenience of illustration in fig. 4, the case where the driving module 21 includes the driving unit 211, the power supply unit 212, and the voltage sampling unit 213 is illustrated only by way of example.
As shown in fig. 4, the driving unit 211 is electrically connected to the control module 10, the power supply unit 212 and the voltage sampling unit 213, and the power supply unit 212 is electrically connected to the voltage sampling unit 213 and is used for electrically connecting to the power supply positive terminal LD + a of the laser light source module 1 corresponding to the driving module 21.
In one embodiment, any one of the driving modules 21-2N comprises a driving unit and a power supply unit and a current sampling unit.
For convenience of illustration in fig. 5, a case where the driving module 21 includes a driving unit 211, a power supply unit 212, and a current sampling unit 214 is illustrated only by way of example.
As shown in fig. 5, the driving unit 211 is electrically connected to the control module 10, the power supply unit 212 and the current sampling unit 214, the power supply unit 212 is electrically connected to the current sampling unit 214, and the current sampling unit 213 is used for being electrically connected to the power supply positive terminal LD + a of the laser light source module 1 corresponding to the driving module 21.
In one embodiment, any one of the drive modules 21-2N includes a drive unit and a switch unit.
For convenience of illustration in fig. 6, a case where the driving module 21 includes the driving unit 211 and the switching unit 215 is illustrated only by way of example.
As shown in fig. 6, the driving unit 211 is electrically connected to the control module 10 and the switch unit 215, and the switch unit 215 is electrically connected to the monitoring module 31 corresponding to the driving module 21 and is used for electrically connecting to the power supply negative terminal LD-K of the laser light source module 1 corresponding to the driving module 21. In one embodiment, any one of the driving modules 21-2N comprises a driving unit, a power supply unit, a voltage sampling unit, a current sampling unit and a switch unit.
For convenience of illustration in fig. 7, a case where the driving module 21 includes a driving unit 211, a power supply unit 212, a voltage sampling unit 213, a current sampling unit 214, and a switching unit 215 is illustrated only by way of example.
As shown in fig. 7, the driving unit 211 is electrically connected to the control module 10, the power supply unit 212, the voltage sampling unit 213, the current sampling unit 214, and the switch unit 215, the power supply unit 212 is electrically connected to the voltage sampling unit 213 and the current sampling unit 214, the current sampling unit 213 is electrically connected to the power supply positive terminal LD + a of the laser light source module 1 corresponding to the driving module 21, and the switch unit 215 is electrically connected to the power supply negative terminal LD-K of the laser light source module 1 corresponding to the driving module 21 and the corresponding monitoring module 31.
In this embodiment, the driving unit 211 is configured to enter an on state or an off state according to a driving enable control signal; when the driving unit 211 enters the operating state, the switching unit 215 is controlled to be turned on or off according to the light source enable control signal, and the power supply unit 212 is also controlled to output the light source driving power according to the light source power supply control signal.
In a specific application, the driving unit may be a Power management Control Circuit or chip (PMCC) having Power management and Control functions, and the built-in buffer or buffer chip may buffer a pulse width modulation signal output to the Control switch unit for switching on or off the switch unit; the power supply unit can be a power supply conversion topological circuit composed of components such as an inductor, a diode and a field effect transistor and is used for being connected with an external power supply and converting the external power supply into a light source driving power supply suitable for the laser light source module; the switch unit may be an electronic switch tube having an electronic switching function, such as a triode or a field effect transistor.
In one embodiment, the switching unit is an N-channel field effect transistor.
In this embodiment, the voltage sampling unit 213 is used for sampling the voltage parameter of the light source driving power supply and transmitting the voltage parameter to the driving unit 211.
In a specific application, the voltage sampling unit may be a voltage feedback circuit or a chip with a voltage feedback function.
In this embodiment, the current sampling unit 214 is used for sampling the current parameter of the light source driving power supply and sending the current parameter to the driving unit 211.
In a specific application, the current sampling unit may be a current sampling circuit or a chip with a current sampling function.
In this embodiment, the driving unit 211 is configured to control the power supply unit 212 to adjust the voltage and the current of the light source driving power according to the voltage parameter and the current parameter, so that the voltage of the light source driving power is less than or equal to the rated working voltage of the laser light source module 1 corresponding to the driving module 21, and the current of the light source driving power is less than or equal to the rated working current of the laser light source module 1 corresponding to the driving module 21.
In specific application, the driving unit is used for controlling and adjusting the voltage and the current of the light source driving power supply output by the power supply unit according to the voltage parameter and the current parameter in a feedback mode, so that the voltage of the light source driving power supply does not exceed the rated working voltage of the laser light source module, the current of the light source driving power supply does not exceed the rated working current of the laser light source module, and the working safety and the reliability of the laser light source module are effectively improved.
In this embodiment, when the switch unit 215 is turned on, the power supply negative terminal LD-K of the laser light source module 1 corresponding to the driving module 21 is electrically connected to the corresponding monitoring module 31, and the laser light source module 1 corresponding to the driving module 21 is turned on; when the switch unit 215 is turned off, the power supply negative terminal LD-K of the laser light source module 1 corresponding to the driving module 21 is electrically disconnected from the corresponding monitoring module 31, and the laser light source module 1 corresponding to the driving module 21 is turned off.
In specific application, the driving unit controls the switch unit to be switched on or switched off according to the light source enabling control signal so as to control the laser light source module to be turned on or off, and therefore the on-off control of the laser light source module is achieved.
In the embodiment, any one of the monitoring modules 31-3N comprises a monitoring unit and an analog-to-digital conversion unit.
For convenience of illustration in fig. 7, the case where the monitoring module 31 includes the monitoring unit 311 and the analog-to-digital conversion unit 312 is illustrated only by way of example.
As shown in fig. 7, in the present embodiment, the monitoring unit 311 is electrically connected to the analog-to-digital conversion unit 312 and the switch unit 215 of the driving module 21 corresponding to the monitoring module 31, and the analog-to-digital conversion unit 312 is electrically connected to the control module 10.
In this embodiment, the monitoring unit 311 is configured to monitor a working temperature parameter when the laser light source module 1 corresponding to the monitoring module 31 is turned on, obtain a working current parameter and a working voltage parameter according to an output power of the laser light source module 1 corresponding to the monitoring module 31, and output the working temperature parameter, the working current parameter, and the working voltage parameter to the analog-to-digital conversion unit 312.
In a specific application, the monitoring unit can be realized by a temperature sensor, a current sampling circuit and a voltage sampling circuit.
In the present embodiment, the analog-to-digital conversion unit 312 is configured to perform analog-to-digital conversion on the operating temperature parameter, the operating current parameter and the operating voltage parameter, and output the analog-to-digital conversion to the control module 10.
In a specific application, the Analog-to-Digital Converter (ADC) or the chip may be used to implement the ADC.
In this embodiment, the monitoring unit of any one of the monitoring modules includes a temperature monitoring subunit, a current sampling subunit, and a voltage sampling subunit, and the analog-to-digital conversion unit of any one of the monitoring modules includes a first analog-to-digital conversion subunit, a second analog-to-digital conversion subunit, and a third analog-to-digital conversion subunit.
For convenience of illustration in fig. 8, the monitoring unit 311 is only exemplarily shown to include a temperature monitoring sub-unit 3111, a current sampling sub-unit 3112 and a voltage sampling sub-unit 3113, and the analog-to-digital conversion unit 312 includes a first analog-to-digital conversion sub-unit 3121, a second analog-to-digital conversion sub-unit 3122 and a third analog-to-digital conversion sub-unit 3123.
As shown in fig. 8, in this embodiment, the current sampling sub-unit 3112 and the voltage sampling sub-unit 3113 are electrically connected to the switch unit 215, the first analog-to-digital conversion unit 3121 is electrically connected to the temperature monitoring sub-unit 3111 and the control module 10, the second analog-to-digital conversion unit 3122 is electrically connected to the current sampling sub-unit 3112 and the control module 10, and the third analog-to-digital conversion unit 3123 is electrically connected to the voltage sampling sub-unit 3113 and the control module 10.
In this embodiment, the temperature monitoring subunit 3111 is configured to monitor a working temperature parameter when the laser light source module 1 corresponding to the monitoring module 31 is turned on, and output the working temperature parameter to the first analog-to-digital conversion subunit 3121.
In a specific application, the temperature monitoring subunit may be a temperature sensor disposed near the laser light source module, and the first analog-to-digital converting subunit may be an analog-to-digital converter.
In this embodiment, the current sampling subunit 3112 is configured to obtain the operating current parameter according to the output power of the laser light source module 1 corresponding to the monitoring module 31 and output the operating current parameter to the second analog-to-digital conversion subunit 3122.
In a specific application, the current sampling subunit may be a current sampling circuit or a chip, and the second analog-to-digital conversion subunit may be an analog-to-digital converter.
In this embodiment, the voltage sampling subunit 3113 is configured to obtain the working voltage parameter according to the output power of the laser light source module 1 corresponding to the monitoring module 31 and output the working voltage parameter to the third analog-to-digital conversion subunit 3123.
In a specific application, the voltage sampling subunit may be a voltage sampling circuit or a chip, and the third analog-to-digital conversion subunit may be an analog-to-digital converter.
In this embodiment, the first analog-to-digital conversion subunit 3121 is configured to perform analog-to-digital conversion on the operating temperature parameter and output the operating temperature parameter to the control module 10;
the second analog-to-digital conversion subunit 3122 is configured to perform analog-to-digital conversion on the working current parameter and output the working current parameter to the control module 10;
the third analog-to-digital conversion subunit 3123 is configured to perform analog-to-digital conversion on the operating voltage parameter and output the operating voltage parameter to the control module 10.
In a specific application, the sampling precision of the first analog-to-digital conversion subunit, the second analog-to-digital conversion subunit and the third analog-to-digital conversion subunit can be set to be 8 bits to 32 bits according to actual needs.
In this embodiment, any one of the laser light source modules 1 to N includes at least one laser light source unit, and each laser light source unit includes at least one laser light source;
at least one laser light source unit is connected in series or in parallel, and at least one laser light source unit is connected in series.
In specific application, the number of the laser light source units and the number of the laser light sources included in the laser light source module can be set according to actual needs, and the laser light sources can be laser emitting diodes.
For convenience of illustration in fig. 9, it is only exemplarily shown that one laser light source unit 11 of the laser light source module 1 includes M laser light sources, which are respectively denoted as LD1, LD2, … …, and LDM; wherein M is not less than 1 and M is an integer.
For convenience of illustration, fig. 10 only shows an example of a case where the laser light source module 1 includes m laser light source units (respectively, 11, 12, … …, and 1m) and the m laser light source units are connected in series, where m ≧ 1 and m are integers.
For convenience of illustration, fig. 11 only shows the case where the laser light source module 1 includes m laser light source units (respectively 11, 12, … …, and 1m) and the m laser light source units are connected in parallel, where m ≧ 1 and m are integers.
In a specific application, the colors of all the laser light sources in one laser light source unit may be completely the same, partially the same or completely different, and the colors of the laser light sources in two different laser light source units may be the same or different, and may be set according to actual needs.
Example four
As shown in fig. 12, the present embodiment provides a laser light source driving system 1000, which includes a digital light processing module 200 and a laser light source driving circuit 100;
the digital light processing module 200 is electrically connected with the control module 10;
the digital light processing module 200 is used for outputting a control signal to the control module 10 and outputting the control signal to the driving modules 21-2N through the control module 10;
the priority of the control signal output by the digital light processing module 200 is higher than the priority of the control signal output by the control module 10.
In a specific application, the control signal includes a driving enable control signal, a light source enable control signal and a light source power control signal. The digital optical processing module and the control module can output a drive enabling control signal, a light source enabling control signal and a light source power supply control signal, when the digital optical processing module and the control module output the drive enabling control signal, the light source enabling control signal and the light source power supply control signal, the priority of the drive enabling control signal, the light source enabling control signal and the light source power supply control signal output by the digital optical processing module is higher than the priority of the drive enabling control signal, the light source enabling control signal and the light source power supply control signal output by the control module, and the control module only outputs the drive enabling control signal, the light source enabling control signal and the light source power supply control signal output by the digital optical processing module to the drive module; when the digital light processing module does not output the driving enabling control signal, the light source enabling control signal and the light source power supply control signal, the control module outputs the driving enabling control signal, the light source enabling control signal and the light source power supply control signal.
In a specific application, the Digital Light Processing module may be a DLP (Digital Light Processing) chip or a circuit board including a DMD (Digital Micromirror Device) chip.
As shown in fig. 12, in the present embodiment, the laser light source driving system 1000 further includes a display control module 300;
the display control module 300 is electrically connected with the digital light processing module 200 and the control module 10;
the display control module 300 is used for controlling the working states of the digital light processing module 200 and the laser driving circuit 100, and displaying a working temperature parameter, a working current parameter and a working voltage parameter.
In a specific application, the display control module may be a touch display panel with display and control functions, or may be a combination of a display and a human-computer interaction device such as a keyboard and a mouse.
This embodiment can realize the drive control and the monitoring and the feedback control of working parameter to at least one laser source module through providing a laser source actuating system, and the protection laser source is not damaged, reduces the laser source and damages the risk, improves the drive reliability, and then improves the wholeness ability of system.
EXAMPLE five
As shown in fig. 13, in the present embodiment, the laser light source driving circuit 100 further includes an or module 70, or the or module 70 is electrically connected to the control module 10, the driving modules 21 to 2N and the digital light processing module 200;
the digital light processing module 200 and the control module 10 output control signals to the or module 70, and output the control signals to the driving modules 21-2N through the or module 70.
In a specific application, when the digital light processing module and the control module output the control signal simultaneously, or the module selects to output the control signal output by the digital light processing module to the driving module according to a preset priority principle (that is, the priority of the control signal output by the digital light processing module is higher than the priority of the control signal output by the control module); when one of the digital light processing module and the control module outputs a control signal, the OR module outputs the output control signal to the driving module.
In a particular application, the or module may be an or circuit or a or chip.
The laser light source driving circuit and the laser light source driving system provided by the embodiment of the invention can be applied to an RGB three-color laser projector or equipment for debugging or testing the working performance of a laser light source.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (12)
1. A laser light source driving circuit is characterized by comprising a control module, at least one driving module and at least one monitoring module;
the control module is respectively electrically connected with each driving module and each monitoring module, each driving module, each monitoring module and each laser light source module correspond to each other in pairs, and the driving modules and the monitoring modules are used for being electrically connected with the corresponding laser light source modules;
the control module is used for outputting a control signal to the driving module, the driving module is used for entering a working state according to the control signal and lightening the corresponding laser light source module, the monitoring module is used for collecting the working parameters of the corresponding laser light source module and feeding back the working parameters to the control module, the control signals include a drive enable control signal, a light source enable control signal and a light source power control signal, wherein, one of the driving modules comprises a driving unit, a power supply unit and a switch unit, the driving unit is used for entering a working state according to the driving enabling control signal, the power supply unit is controlled to output a light source driving power supply according to the light source power supply control signal, the switch unit is controlled to be switched on or switched off according to the light source enabling control signal, the light source power supply control signal is a pulse width modulation signal for controlling the brightness of the laser light source when the laser light source is lighted.
2. The laser light source driving circuit according to claim 1, wherein the driving module includes a voltage sampling unit;
the driving unit is electrically connected with the control module, the power supply unit and the voltage sampling unit, and the power supply unit is electrically connected with the voltage sampling unit and is used for being electrically connected with a power supply positive end of the laser light source module corresponding to the driving module;
the voltage sampling unit is used for sampling the voltage parameter of the light source driving power supply and sending the voltage parameter to the driving unit;
the driving unit is further used for controlling the power supply unit to adjust the voltage of the light source driving power supply according to the voltage parameter, so that the voltage of the light source driving power supply is smaller than or equal to the rated working voltage of the laser light source module corresponding to the driving module.
3. The laser light source driving circuit according to claim 1, wherein the driving module includes a current sampling unit;
the driving unit is electrically connected with the control module, the power supply unit and the current sampling unit, the power supply unit is electrically connected with the current sampling unit, and the current sampling unit is used for being electrically connected with a power supply positive end of the laser light source module corresponding to the driving module;
the current sampling unit is used for sampling the current parameter of the light source driving power supply and sending the current parameter to the driving unit;
the driving unit is further used for controlling the power supply unit to adjust the current of the light source driving power supply according to the current parameter, so that the current of the light source driving power supply is smaller than or equal to the rated working current of the laser light source module corresponding to the driving module.
4. The laser light source driving circuit according to claim 1, wherein the driving unit is electrically connected to the control module and the switch unit, and the switch unit is electrically connected to the monitoring module corresponding to the driving module and is configured to be electrically connected to a negative power terminal of the laser light source module corresponding to the driving module;
the switch unit is used for switching on the electric connection between the monitoring module corresponding to the driving module and the power supply negative end of the laser light source module when the switch unit is conducted, so that the laser light source module corresponding to the driving module is lightened; and the switch unit is also used for disconnecting the electric connection between the monitoring module corresponding to the driving module and the power supply negative end of the laser light source module when the laser light source module is disconnected, so that the laser light source module corresponding to the driving module is extinguished.
5. The laser light source driving circuit according to claim 1, wherein the monitoring module includes a monitoring unit and an analog-to-digital conversion unit;
the monitoring unit is electrically connected with the analog-to-digital conversion unit and the driving module corresponding to the monitoring module, and the analog-to-digital conversion unit is electrically connected with the control module;
the monitoring unit is used for monitoring a working temperature parameter when the laser light source module corresponding to the monitoring module is lightened, obtaining a working current parameter and a working voltage parameter according to an output power supply of the laser light source module corresponding to the monitoring module, and outputting the working temperature parameter, the working current parameter and the working voltage parameter to the analog-to-digital conversion unit;
the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the working temperature parameter, the working current parameter and the working voltage parameter and outputting the analog-to-digital conversion to the control module.
6. The laser light source driving circuit according to claim 5, wherein the monitoring unit comprises a temperature monitoring sub-unit, a current sampling sub-unit and a voltage sampling sub-unit, and the analog-to-digital conversion unit comprises a first analog-to-digital conversion sub-unit, a second analog-to-digital conversion sub-unit and a third analog-to-digital conversion sub-unit;
the current sampling subunit and the voltage sampling subunit are electrically connected with a driving module corresponding to the monitoring module, the first analog-to-digital conversion unit is electrically connected with the temperature monitoring subunit and the control module, the second analog-to-digital conversion unit is electrically connected with the current sampling subunit and the control module, and the third analog-to-digital conversion unit is electrically connected with the voltage sampling subunit and the control module;
the temperature monitoring subunit is used for monitoring a working temperature parameter when the laser light source module corresponding to the monitoring module is lightened and outputting the working temperature parameter to the first analog-to-digital conversion subunit;
the current sampling subunit is used for obtaining working current parameters according to the output power supply of the laser light source module corresponding to the monitoring module and outputting the working current parameters to the second analog-to-digital conversion subunit;
the voltage sampling subunit is used for obtaining working voltage parameters according to the output power supply of the laser light source module corresponding to the monitoring module and outputting the working voltage parameters to the third analog-to-digital conversion subunit;
the first analog-to-digital conversion subunit is used for performing analog-to-digital conversion on the working temperature parameter and outputting the working temperature parameter to the control module;
the second analog-to-digital conversion subunit is used for performing analog-to-digital conversion on the working current parameter and outputting the working current parameter to the control module;
and the third analog-to-digital conversion subunit is used for performing analog-to-digital conversion on the working voltage parameter and outputting the working voltage parameter to the control module.
7. The laser light source driving circuit according to claim 1, further comprising a first driving buffer module and a second driving buffer module;
the first driving buffer module and the second driving buffer module are electrically connected with the control module and the driving module;
the control module is used for outputting a light source enabling control signal to the driving module through the first driving buffer module, and the first driving buffer module is used for temporarily storing the light source enabling control signal;
the control module is further configured to output a light source power control signal to the driving module through the second driving buffer module, and the second driving buffer module is configured to temporarily store the light source power control signal.
8. The laser light source driving circuit according to claim 1, further comprising at least one fan driving module;
the fan driving module is electrically connected with the control module and at least one fan, and one fan driving module corresponds to at least one laser light source module;
the control module is used for controlling the fan driving module corresponding to the laser light source module to drive at least one fan to start or close according to the working temperature parameter of the laser light source module.
9. The laser light source driving circuit according to claim 1, wherein the laser light source module comprises at least one laser light source unit, the laser light source unit comprising at least one laser light source;
the at least one laser light source unit is connected in series or in parallel, and the at least one laser light source unit is connected in series.
10. A laser light source driving system, comprising a digital light processing module and the laser light source driving circuit of any one of claims 1 to 9;
the digital light processing module is electrically connected with the control module;
the digital light processing module is used for outputting a control signal to the control module;
the control module is used for outputting the control signal output by the digital light processing module to the driving module, or directly outputting the control signal to the driving module;
the priority of the control signal output by the digital light processing module is higher than that of the control signal output by the control module.
11. The laser light source driving system according to claim 10, wherein the laser light source driving circuit further comprises an or module electrically connected to the control module, the driving module, and the digital light processing module;
the digital light processing module and the control module are used for outputting control signals to the OR module and outputting the control signals to the driving module through the OR module.
12. The laser light source driving system according to claim 10 or 11, further comprising a display control module;
the display control module is electrically connected with the digital light processing module and the control module;
the display control module is used for controlling the working states of the digital light processing module and the laser light source driving circuit and displaying the working parameters of the laser light source module.
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