CN216982015U - Projector circuit with adjustable light source output power and projector - Google Patents
Projector circuit with adjustable light source output power and projector Download PDFInfo
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- CN216982015U CN216982015U CN202220433904.3U CN202220433904U CN216982015U CN 216982015 U CN216982015 U CN 216982015U CN 202220433904 U CN202220433904 U CN 202220433904U CN 216982015 U CN216982015 U CN 216982015U
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Abstract
The application relates to a projector circuit and a projector with adjustable light source output power, which comprises a communication module, a storage circuit, a main control chip and a dimming control circuit, wherein the communication module is used for receiving a dimming control instruction, the storage circuit is used for storing preset light source power values corresponding to the dimming control instructions, the main control chip is used for outputting corresponding PWM control signals according to the received dimming control instruction, the dimming control circuit is used for detecting the average power value of a white light source circuit and outputting corresponding power feedback signals, so that when the main control chip receives the power feedback signals, the main control chip compares the power value corresponding to the power feedback signals with the preset light source power values and outputs the adjusted PWM control signals, so that the white light source circuit adjusts the output average power value to the preset light source power values based on the adjusted PWM control signals, thereby realizing the adjustment of the white light source circuit power, and then realize the purpose of the luminance of the screen luminance of adjustment intelligent projecting apparatus, improved user experience and felt.
Description
Technical Field
The application relates to the technical field of projection equipment, in particular to a projector circuit with adjustable light source output power and a projector.
Background
Nowadays, an intelligent projector is one of many intelligent electronic products in recent years, and is a projection product integrating human-computer interaction, multimedia interconnection and network search. The method has very wide application in smart families and smart office scenes. The maximum value of the screen brightness of the intelligent projector mainly depends on the power of the light source, and the higher the power of the light source, the higher the screen brightness. That is, the screen brightness directly affects the viewing experience of the user, but the requirements of different users for the screen brightness are different.
Most of the existing intelligent projectors cannot adjust the power of a light source, the screen brightness can be roughly adjusted only by adjusting a back plate of a display screen, the number of adjusted gears is small, stepless adjustment cannot be achieved, and user experience is influenced.
At present, no effective solution is provided aiming at the problem that the power of a light source cannot be adjusted and the user experience is poor in the related art.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a projector circuit with adjustable light source output power and a projector, and aims to at least solve the problem that in the related art, an intelligent projector cannot adjust the power of a light source and causes poor user experience.
In a first aspect, an embodiment of the present application provides a projector circuit with adjustable output power of a light source, where the circuit includes:
the communication module is used for receiving a dimming control instruction;
the storage circuit is used for storing the preset light source power value corresponding to each dimming control instruction;
the main control chip is respectively connected with the communication module and the storage circuit, and is used for outputting a corresponding PWM (Pulse Width Modulation) control signal according to the received dimming control instruction, and reading a preset light source power value corresponding to the dimming control instruction from the storage circuit when receiving the dimming control instruction;
the dimming control circuit is respectively connected with the main control chip and the white light source circuit and is used for detecting the average power value of the white light source circuit and outputting a corresponding power feedback signal when receiving the PWM control signal; and the main control chip is used for comparing a power value corresponding to the power feedback signal with the preset light source power value and outputting an adjusted PWM control signal when receiving the power feedback signal, so that the white light source circuit adjusts the output average power value to the preset light source power value based on the adjusted PWM control signal.
In some embodiments, the dimming control circuit comprises a constant current input end, a first power input end, a high-voltage impact prevention protection circuit, a level conversion circuit, a first switch tube and a detection circuit; wherein the content of the first and second substances,
the constant current input end is connected with a constant current source;
the first power supply input end receives an input first voltage;
the input end of the high-voltage impact prevention protection circuit is connected with a PWM signal end of the main control chip, and the high-voltage impact prevention protection circuit is used for receiving the PWM control signal and outputting a protection signal when detecting that the voltage output by the PWM signal end is higher than a preset voltage value;
the power supply input end of the level conversion circuit is connected with the first power supply input end, the controlled end of the level conversion circuit is connected with the output end of the high-voltage impact prevention protection circuit, the power supply output end of the level conversion circuit is grounded, and the level conversion circuit is used for converting the PWM control signal to obtain a converted PWM control signal;
the input end of the first switching tube is connected with the constant current input end, the controlled end of the first switching tube is connected with the output end of the level conversion circuit, the output end of the first switching tube is connected with the white light source power supply end through a detection circuit, and the first switching tube is used for conducting after receiving the converted PWM control signal;
the detection circuit is connected with the acquisition end of the main control chip and used for detecting the average power value of the white light source circuit and outputting a corresponding power feedback signal when the first switching tube is conducted.
In some embodiments, the level shift circuit includes a first resistor and a first NPN triode, a first terminal of the first resistor is a power input terminal of the level shift circuit, a second terminal of the first resistor is connected to a collector of the first NPN triode, a base of the first NPN triode is a controlled terminal of the level shift circuit, and an emitter of the first NPN triode is a power output terminal of the level shift circuit.
In some embodiments, the dimming control circuit further comprises:
the power input end of the first switch circuit is connected with the second power input end, the controlled end of the first switch circuit is connected with the output end of the high-voltage impact prevention protection circuit, the power output end of the first switch circuit is grounded, the output end of the first switch circuit is connected with the controlled end of the level conversion circuit, and the first switch circuit is used for being conducted when receiving the PWM control signal, so that the level conversion circuit obtains the converted PWM control signal.
In some embodiments, the first switch circuit includes a second resistor and a second switch tube, a first end of the second resistor is a power input end of the first switch circuit, a second end of the second resistor is an output end of the first switch circuit, a second end of the second resistor is connected to an input end of the second switch tube, a controlled end of the second switch tube is a controlled end of the first switch circuit, and an output end of the second switch tube is a power output end of the first switch circuit.
In some embodiments, the second switch is an NPN transistor or a PNP transistor.
In some of these embodiments, the high voltage surge protection circuit is a third resistor.
In some embodiments, the detection circuit includes a sampling resistor, a first end of the sampling resistor, an output end of the first switch tube and a first sampling end of the main control chip are interconnected, and a second end of the sampling resistor, a second sampling end of the main control chip and the white light source power supply end are interconnected.
In some embodiments, the communication module is an integrated communication module or infrared receiving module integrating WIFI and bluetooth, and the storage circuit is an EMMC chip.
In a second aspect, the projector according to the embodiments of the present application includes the projector circuit with adjustable output power of the light source as described above.
In the embodiment, the communication module receives the dimming control instruction, the storage circuit stores the preset light source power value corresponding to each dimming control instruction, the main control chip outputs the corresponding PWM control signal according to the received dimming control instruction, the dimming control circuit detects the average power value of the white light source circuit and outputs the corresponding power feedback signal, so that when the main control chip receives the power feedback signal, the main control chip compares the power value corresponding to the power feedback signal with the preset light source power value and outputs the adjusted PWM control signal, so that the white light source circuit adjusts the output average power value to the preset light source power value based on the adjusted PWM control signal, thereby adjusting the power of the white light source circuit and further adjusting the brightness of the screen brightness of the intelligent projector, in addition, the duty ratio of the PWM signal output by the main control chip can be infinitely adjustable from 0% to 100%, and then the power of the white light source circuit can be adjusted in a stepless manner by 0-100%, so that the purpose of accurately controlling the output of the power of the white light source can be realized, compared with the prior art that the screen brightness can only be roughly adjusted by adjusting a back plate of a display screen, the adjustment gears are few, and the stepless adjustment mode cannot be realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a first functional block of a projector circuit with adjustable output power of a light source according to an embodiment of the present application;
FIG. 2 is a diagram illustrating the correspondence between "brightness adjustment index value" and "light source power" according to an embodiment of the present application;
FIG. 3 is a schematic diagram of functional modules of the circuit of the projector with adjustable output power of the light source according to the embodiment;
FIG. 4 is a first circuit schematic diagram of a projector circuit with adjustable light source output power according to an embodiment of the present application;
FIG. 5 is a second circuit schematic diagram of a projector circuit with adjustable light source output power according to an embodiment of the present application;
fig. 6 is a second circuit schematic diagram of a projector circuit with adjustable light source output power according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
Nowadays, an intelligent projector is one of many intelligent electronic products in recent years, and is a projection product integrating human-computer interaction, multimedia interconnection and network search. The method has wide application in intelligent families and intelligent office scenes. However, most of the existing intelligent projectors cannot adjust the power of the light source, and only the brightness of the screen can be roughly adjusted by adjusting the back plate of the display screen, the number of the adjusted gears is small, stepless adjustment cannot be achieved, and user experience is affected.
In order to solve the above problem, the present application provides a projector circuit with adjustable light source output power, fig. 1 is a schematic diagram of a first functional module of the projector circuit with adjustable light source output power according to an embodiment of the present application, and as shown in fig. 1, the projector with adjustable light source output power includes:
a communication module 110, configured to receive a dimming control instruction; the dimming control instruction is a brightness adjusting instruction sent by a user through selecting a corresponding button by a remote controller;
the storage circuit 120 is configured to store a preset light source power value corresponding to each dimming control instruction; the storage circuit 120 may be implemented by a memory chip or the like, and in addition, a preset light source power value corresponding to each dimming control instruction is set according to a user requirement; the dimming control command can be understood as a division value of a brightness adjustment button of a UI interface on a screen, the division value of the brightness adjustment button is set to be 100, each division value of the brightness adjustment button corresponds to a light source power value, calibration is performed by a data relationship between the division value of the brightness adjustment and the light source power, and a calibration result (i.e., a preset light source power value corresponding to the dimming control command) is stored in the storage circuit 120, so that it is convenient to subsequently serve as a basis for feedback adjustment of the PWM control signal. Fig. 2 is a schematic diagram of a corresponding relationship between a "brightness adjustment division value" and "light source power" according to an embodiment of the present application, and as shown in fig. 2, the division values of the "brightness adjustment buttons" are set to be 100, each of the brightness adjustment button division values corresponds to a light source power value, and the duty ratio of the PWM signal output by the main control chip can be steplessly adjusted in 0-100%, so that the power of the white light source circuit can also be steplessly adjusted in 0-100%; those skilled in the art will appreciate that the stepless adjustment is an adjustment mode that is not a jump type adjustment, but is any relatively smooth adjustment within a range, and therefore, the details thereof are not repeated herein.
The main control chip 130 is respectively connected to the communication module 110 and the storage circuit 120, and configured to output a corresponding PWM control signal according to the received dimming control instruction, and read a preset light source power value corresponding to the dimming control instruction from the storage circuit 120 when receiving the dimming control instruction;
the dimming control circuit 140 is respectively connected to the main control chip 130 and the white light source circuit 150, and is configured to detect an average power value of the white light source circuit 150 and output a corresponding power feedback signal when receiving the PWM control signal; it should be noted that the white light source circuit 150 of the present embodiment is implemented by using an existing driving circuit and a white light emitting LED lamp assembly, and certainly, in other embodiments, other circuits may be used, which is not limited herein; and the main control chip 130 is configured to compare a power value corresponding to the power feedback signal with a preset light source power value when receiving the power feedback signal, and output an adjusted PWM control signal, so that the white light source circuit 150 adjusts an output average power value to the preset light source power value based on the adjusted PWM control signal. For example, when the main control chip 130 detects that the power value corresponding to the power feedback signal fed back by the dimming control circuit 140 is higher than the preset light source power value, the main control chip 130 decreases the PWM duty ratio, otherwise, when the main control chip 130 detects that the power value corresponding to the power feedback signal fed back by the dimming control circuit 140 is lower than the preset light source power value, the main control chip 130 increases the PWM duty ratio until the detected power value corresponding to the fed back power feedback signal and the preset light source power value equal to the preset light source power value calibrated in advance are output, so that the white light source circuit 150 adjusts the output average power value to the preset light source power value based on the adjusted PWM control signal, thereby adjusting the power of the white light source circuit 150, and further achieving the purpose of adjusting the brightness of the screen brightness of the intelligent projector, and in addition, since the duty ratio of the PWM signal output by the main control chip 130 can be infinitely adjustable by 0-100%, the power of the white light source circuit 150 can be adjusted in a stepless manner by 0-100%, so that the output of the power of the white light source can be accurately controlled, the requirements of different users on the screen brightness of the projector are met, compared with the prior art that the screen brightness can only be roughly adjusted by adjusting the back plate of the display screen, the adjustment gear is few, stepless adjustment cannot be achieved, and good viewing experience is brought to the users.
It should be noted that fig. 3 is a schematic diagram of a functional module of the projector circuit with adjustable light source output power in this embodiment, referring to fig. 3, the projector circuit with adjustable light source output power in this embodiment further includes a power module, where the power module includes an adapter (not shown in the figure), a rechargeable battery and a power driving circuit (not shown in the figure), and of course, in other embodiments, the power module may be other, and is not limited herein; in this embodiment, the power module supplies power to the display screen and the white light source circuit 150, and the dimming control circuit 140 detects an average power value of the white light source circuit 150 and outputs a corresponding power feedback signal, so that the main control chip 130 adjusts the power value of the white light source circuit 150 by outputting the adjusted PWM control signal. In addition, in order to reduce the overall size, the communication module 110, the storage circuit 120, the main control chip 130, the power module (not shown in the figure) and the dimming control circuit 140 in this embodiment are all integrated on an electronic control board (i.e. the system motherboard in fig. 3), but in some other embodiments, each circuit may also be independently configured, which is not specifically limited herein;
in the technical solution of this embodiment, the communication module 110 receives the dimming control command, the storage circuit 120 stores the preset light source power value corresponding to each dimming control command, the main control chip 130 outputs a corresponding PWM control signal according to the received dimming control command, the dimming control circuit 140 detects the average power value of the white light source circuit 150 and outputs a corresponding power feedback signal, so that when the main control chip 130 receives the power feedback signal, the main control chip 130 compares the power value corresponding to the power feedback signal with the preset light source power value and outputs an adjusted PWM control signal, so that the white light source circuit 150 adjusts the output average power value to the preset light source power value based on the adjusted PWM control signal, thereby adjusting the power of the white light source circuit 150 and further achieving the purpose of adjusting the brightness of the screen brightness of the intelligent projector, in addition, the duty ratio of the PWM signal output by the main control chip 130 can be adjusted in a stepless manner of 0-100%, so that the power of the white light source circuit 150 can be adjusted in a stepless manner of 0-100%, and therefore the purpose of accurately controlling the power output of the white light source can be achieved.
Fig. 4 is a first circuit schematic diagram of a projector circuit with adjustable light source output power according to an embodiment of the present application, and referring to fig. 4, in some embodiments, the dimming control circuit 140 includes a constant current input terminal, a first power input terminal VCC, a high voltage impact protection circuit 410, a level conversion circuit 420, a first switch tube TR1, and a detection circuit 430; wherein the content of the first and second substances,
the constant current input end is connected with a constant current source;
a first power supply input end VCC receives an input first voltage; the first voltage can be set according to the actual requirement of a user;
the input end of the high-voltage impact prevention protection circuit 410 is connected with the PWM signal end of the main control chip 130, and the high-voltage impact prevention protection circuit 410 is configured to receive a PWM control signal and output a protection signal when detecting that the voltage output by the PWM signal end is higher than a preset voltage value; the high voltage impact prevention protection circuit 410 of the present embodiment functions to protect the PWM pin of the main control chip 130 from high voltage impact, so as to improve the safety of the circuit; the preset voltage value can be set according to the actual requirement of a user;
the power input end of the level conversion circuit 420 is connected with the first power input end VCC, the controlled end of the level conversion circuit 420 is connected with the output end of the high-voltage impact protection circuit 410, the power output end of the level conversion circuit 420 is grounded, and the level conversion circuit 420 is used for converting PWM control signals to obtain converted PWM control signals; since the high level of the PWM signal of the main control chip 130 is only 3.3V, and the first switching tube TR1 cannot be directly driven, the level shifter 420 is added to the circuit to perform level shifting and improve the driving capability of the PWM signal.
The input end of the first switching tube TR1 is connected with the constant current input end, the controlled end of the first switching tube TR1 is connected with the output end of the level conversion circuit 420, the output end of the first switching tube TR1 is connected with the white light source power supply end through the detection circuit, and the first switching tube TR1 is used for being switched on after receiving the converted PWM control signal; the constant current module (i.e. constant current source) supplies power to the white light source through the first switch tube TR1, the PWM signal adjusts the average power value of the white light source by controlling the first switch tube TR1 to be turned on and off periodically, and in addition, the first switch tube TR1 in this embodiment is a PMOS tube.
The detection circuit 430 is connected to the acquisition end of the main control chip 130, and is configured to detect an average power value of the white light source circuit 150 and output a corresponding power feedback signal when the first switching tube TR1 is turned on. It should be noted that, an ADC chip is built in the main control chip 130 of this embodiment, and the acquisition end of the main control chip 130 of this embodiment is the acquisition end of the ADC chip built in the main control chip 130, and certainly, in some other embodiments, the main control chip 130 and the external ADC may also be used to implement connection with the detection circuit 430, detect the average power value of the white light source circuit 150, and output a corresponding power feedback signal, which is not limited specifically here.
In some embodiments, referring to fig. 4, the level shifter circuit 420 includes a first resistor R6 and a first NPN transistor Q1, a first end of the first resistor R6 is a power input end of the level shifter circuit 420, a second end of the first resistor R6 is connected to a collector of the first NPN transistor Q1, a base of the first NPN transistor Q1 is a controlled end of the level shifter circuit 420, and an emitter of the first NPN transistor Q1 is a power output end of the level shifter circuit 420.
Fig. 5 is a second circuit schematic diagram of a projector circuit with adjustable light source output power according to an embodiment of the present application, and referring to fig. 5, in some embodiments, the dimming control circuit 140 further includes:
the power input end of the first switch circuit 510 is connected to the second power input end, the controlled end of the first switch circuit 510 is connected to the output end of the high-voltage impact protection circuit 410, the power output end of the first switch circuit 510 is grounded, the output end of the first switch circuit 510 is connected to the controlled end of the level conversion circuit 420, and the first switch circuit 510 is used for conducting when receiving the PWM control signal, so that the level conversion circuit 420 obtains the converted PWM control signal.
In some embodiments, referring to fig. 5, the first switch circuit 510 includes a second resistor R4 and a second switch Q2, a first end of the second resistor R4 is a power input end of the first switch circuit 510, a second end of the second resistor R4 is an output end of the first switch circuit 510, a second end of the second resistor R4 is connected to an input end of the second switch Q2, a controlled end of the second switch Q2 is a controlled end of the first switch circuit 510, and an output end of the second switch Q2 is a power output end of the first switch circuit 510.
In an embodiment, the second switching tube Q2 is an NPN triode or a PNP triode, fig. 6 is a second circuit schematic diagram of the projector circuit with adjustable light source output power according to the embodiment of the present application, as shown in fig. 6, in this embodiment, when the second switching tube Q2 is an NPN, an ADC module built in the main control chip 130 collects voltages U1_ P and U1_ N at two ends of a resistor R3, and calculates an average power P1 of the white light source, where a calculation formula is as follows:
the embodiment adjusts the voltage values of the U1_ P and the U1_ N by adjusting the duty ratio of the PWM signal, so as to adjust the average power P1 of the white light source, wherein the larger the duty ratio, the larger the value of the light source power P1, and the brighter the screen.
Referring to fig. 4 to 6, in an embodiment, the high voltage impact protection circuit 410 is the third resistor R1, but in other embodiments, the high voltage impact protection circuit 410 may also adopt a high voltage impact protection chip with better protection performance, which is not limited herein.
Referring to fig. 4 to 6, in an embodiment, the detection circuit 430 includes a sampling resistor R3, a first end of the sampling resistor R3, an output end of the first switching tube TR1 and a first sampling end ADC _ P of the main control chip 130 are interconnected, and a second end of the sampling resistor R3, a second sampling end ADC _ N of the main control chip 130 and a white light source power supply end are interconnected, but in other embodiments, the detection circuit 430 may employ other sampling chips, which is not limited herein.
In an embodiment, the communication module 110 is the integrated communication module 110 or infrared receiving module of integrated WIFI and bluetooth, so, conveniently receive the signal of remote controller, and the memory circuit 120 is an EMMC (Embedded multimedia controller) chip, the EMMC chip has the characteristic that the data is not lost in the power failure, a PWM signal that main control chip 130 outputs when being used for the storage power failure also, so, even the system power failure, can not lead to losing information yet, when the user opens the intelligent projector next time, the screen can resume luminance before shutting down, user's experience is felt has been improved.
The present embodiment further provides a projector, where the projector includes the projector circuit with adjustable output power of the light source, and since the projector adopts all the technical solutions of all the embodiments, the projector at least has all the beneficial effects brought by the technical solutions of the embodiments, and details are not repeated herein.
It should be understood by those skilled in the art that various features of the above embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. A projector circuit with adjustable light source output power, the circuit comprising:
the communication module is used for receiving a dimming control instruction;
the storage circuit is used for storing the preset light source power value corresponding to each dimming control instruction;
the main control chip is respectively connected with the communication module and the storage circuit and used for outputting a corresponding PWM control signal according to the received dimming control command and reading a preset light source power value corresponding to the dimming control command from the storage circuit when receiving the dimming control command;
the dimming control circuit is respectively connected with the main control chip and the white light source circuit and is used for detecting the average power value of the white light source circuit and outputting a corresponding power feedback signal when receiving the PWM control signal; and the main control chip is used for comparing a power value corresponding to the power feedback signal with the preset light source power value and outputting an adjusted PWM control signal when receiving the power feedback signal, so that the white light source circuit adjusts the output average power value to the preset light source power value based on the adjusted PWM control signal.
2. The circuit of claim 1, wherein the dimming control circuit comprises a constant current input terminal, a first power supply input terminal, a high voltage surge protection circuit, a level conversion circuit, a first switch tube and a detection circuit; wherein the content of the first and second substances,
the constant current input end is connected with a constant current source;
the first power supply input end receives an input first voltage;
the input end of the high-voltage impact prevention protection circuit is connected with a PWM signal end of the main control chip, and the high-voltage impact prevention protection circuit is used for receiving the PWM control signal and outputting a protection signal when detecting that the voltage output by the PWM signal end is higher than a preset voltage value;
the power input end of the level conversion circuit is connected with the first power input end, the controlled end of the level conversion circuit is connected with the output end of the high-voltage impact protection circuit, the power output end of the level conversion circuit is grounded, and the level conversion circuit is used for converting the PWM control signal to obtain a converted PWM control signal;
the input end of the first switching tube is connected with the constant current input end, the controlled end of the first switching tube is connected with the output end of the level conversion circuit, the output end of the first switching tube is connected with the white light source power supply end through a detection circuit, and the first switching tube is used for conducting after receiving the converted PWM control signal;
the detection circuit is connected with the acquisition end of the main control chip and used for detecting the average power value of the white light source circuit and outputting a corresponding power feedback signal when the first switching tube is conducted.
3. The circuit of claim 2, wherein the level shift circuit comprises a first resistor and a first NPN transistor, a first terminal of the first resistor is a power input terminal of the level shift circuit, a second terminal of the first resistor is connected to a collector of the first NPN transistor, a base of the first NPN transistor is a controlled terminal of the level shift circuit, and an emitter of the first NPN transistor is a power output terminal of the level shift circuit.
4. The circuit of claim 2, wherein the dimming control circuit further comprises:
the power input end of the first switch circuit is connected with the second power input end, the controlled end of the first switch circuit is connected with the output end of the high-voltage impact prevention protection circuit, the power output end of the first switch circuit is grounded, the output end of the first switch circuit is connected with the controlled end of the level conversion circuit, and the first switch circuit is used for being conducted when receiving the PWM control signal, so that the level conversion circuit obtains the converted PWM control signal.
5. The circuit of claim 4, wherein the first switch circuit comprises a second resistor and a second switch tube, a first end of the second resistor is a power input end of the first switch circuit, a second end of the second resistor is an output end of the first switch circuit, a second end of the second resistor is connected with an input end of the second switch tube, a controlled end of the second switch tube is a controlled end of the first switch circuit, and an output end of the second switch tube is a power output end of the first switch circuit.
6. The circuit of claim 5, wherein the second switch is an NPN triode or a PNP triode.
7. The circuit of claim 2, wherein the high voltage surge protection circuit is a third resistor.
8. The circuit of claim 2, wherein the detection circuit comprises a sampling resistor, a first end of the sampling resistor, an output end of the first switch tube and a first sampling end of the main control chip are interconnected, and a second end of the sampling resistor, a second sampling end of the main control chip and the white light source power supply end are interconnected.
9. The circuit of claim 1, wherein the communication module is an integrated communication module integrating WIFI and Bluetooth or an infrared receiving module, and the storage circuit is an EMMC chip.
10. A projector comprising the light source output power adjustable projector circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220433904.3U CN216982015U (en) | 2022-02-28 | 2022-02-28 | Projector circuit with adjustable light source output power and projector |
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| CN202220433904.3U CN216982015U (en) | 2022-02-28 | 2022-02-28 | Projector circuit with adjustable light source output power and projector |
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2022
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