Keyboard light control circuit and keyboard

Abstract

The utility model discloses a keyboard light control circuit and a keyboard, and relates to the technical field of keyboards. The keyboard light control circuit comprises a first power supply input end, a driving control circuit, a light detection circuit, an infrared induction circuit and a control circuit. Wherein the infrared induction circuit can output an induction signal when it is detected that the change of infrared radiation information exceeds a preset range, and the light detection circuit can detect the light intensity of the external environment of the keyboard. The control circuit can judge whether a user exists around the keyboard or not according to the level of the induction signal, when no user exists around the keyboard, the control circuit controls the multiple LED lamps to be turned off, and when a user exists around the keyboard, the control circuit adjusts the multiple LED lamps to emit light according to the detected environment light intensity. Therefore, by using the keyboard light control circuit of the utility model, a user does not need to manually adjust or repeatedly adjust the keyboard light, and the light adjusting efficiency of the keyboard is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of keyboards, and particularly relates to a keyboard lighting control circuit and a keyboard. Background Technique

[0002] Most of the backlights of the keyboards on the market emit light constantly. For example, in different light environments, the backlight remains at a fixed brightness, which may be too high or too low, and is likely to cause additional pressure and fatigue to the eyes.

[0003] The existing keyboard lighting control circuit usually needs to be adjusted manually to adjust the backlight. When the user is not familiar with the keyboard or the ambient light is relatively dim, the user needs to adjust repeatedly or cannot find the adjustment key, which is likely to lead to incorrect adjustment and affect work efficiency. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a keyboard lighting control circuit, aiming to solve the problem of low adjustment efficiency of the existing keyboard lighting control circuit.

[0005] To achieve the above purpose, a keyboard lighting control circuit proposed by the utility model is applied to a keyboard. The keyboard includes a plurality of LED lights. The keyboard lighting control circuit includes:

[0006] A first power input terminal;

[0007] A drive control circuit, the power input terminal of the drive control circuit is connected to the first power input terminal, and a plurality of power output terminals of the drive control circuit are respectively connected to the plurality of LED lights in one-to-one correspondence;

[0008] A light detection circuit, the power input terminal of the light detection circuit is connected to the first power input terminal, and the light detection circuit is used to detect the light intensity of the external environment of the keyboard and output a light detection signal;

[0009] An infrared induction circuit, the power input terminal of the infrared induction circuit is connected to the first power input terminal, and the infrared induction circuit is used to output an induction signal when the detected change in infrared radiation information exceeds a preset range;

[0010] A control circuit, the control circuit is respectively connected to the drive control circuit, the light detection circuit, the infrared induction circuit and the first power input terminal; the control circuit is used to receive the induction signal and the light detection signal, and control the operation of the drive control circuit according to the induction signal and the light detection signal.

[0011] In one embodiment, the infrared sensing circuit includes an infrared sensor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, and a first operational amplifier;

[0012] Wherein, one end of the first resistor is connected to the power input terminal of the infrared sensing circuit, and the other end of the first resistor, the power terminal of the infrared sensor, and one end of the first capacitor are connected; the ground terminal of the infrared sensor and the other end of the first capacitor are grounded; the output terminal of the infrared sensor is connected to one end of the second resistor; the other end of the second resistor is connected to the non-inverting input terminal of the first operational amplifier; the inverting input terminal of the first operational amplifier, one end of the third resistor, and one end of the fourth resistor are connected to one end of the third capacitor; the output terminal of the first operational amplifier, the other end of the fourth resistor, and the other end of the third capacitor are connected to one end of the fifth resistor; the positive power terminal of the first operational amplifier is connected to the power input terminal of the infrared sensing circuit, and the negative power terminal of the first operational amplifier is grounded; the other end of the third resistor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; the other end of the fifth resistor is connected to the control circuit.

[0013] In one embodiment, the light detection circuit includes a first light detection circuit and a second light detection circuit. The first light detection element of the first light detection circuit and the second light detection element of the second light detection circuit are symmetrically arranged on both side surfaces of the keyboard; the first light detection circuit is used to output a first light detection signal, and the second light detection circuit is used to output a second light detection signal; the control circuit is further used to control the operation of the drive control circuit according to the first light detection signal and the second light detection signal.

[0014] In one embodiment, the first light detection element is a first photosensitive resistor; the first light detection circuit further includes a sixth resistor, a seventh resistor, an eighth resistor, a fourth capacitor, a first diode, and a second operational amplifier;

[0015] One end of the first photosensitive resistor is connected to the power input terminal of the first light detection circuit; the other end of the first photosensitive resistor, one end of the sixth resistor and one end of the seventh resistor are connected, and the other end of the sixth resistor is grounded; the other end of the seventh resistor and one end of the fourth capacitor are connected to the non-inverting input terminal of the second operational amplifier; the inverting input terminal of the second operational amplifier is connected to one end of the eighth resistor, and the other end of the eighth resistor and the other end of the fourth capacitor are grounded; the output terminal of the second operational amplifier is connected to the positive electrode of the first diode; the positive electrode of the power supply terminal of the second operational amplifier is connected to the power input terminal of the first light detection circuit, and the negative electrode of the power supply terminal of the second operational amplifier is grounded; the negative electrode of the first diode is connected to the control circuit.

[0016] In one embodiment, the first light detection element is a second photosensitive resistor; the first light detection circuit further includes a ninth resistor, a tenth resistor, an eleventh resistor, a fifth capacitor, a second diode and a third operational amplifier;

[0017] One end of the second photosensitive resistor is connected to the power input terminal of the second light detection circuit; the other end of the second photosensitive resistor, one end of the ninth resistor and one end of the tenth resistor are connected, and the other end of the ninth resistor is grounded; the other end of the tenth resistor and one end of the fifth capacitor are connected to the non-inverting input terminal of the third operational amplifier; the inverting input terminal of the third operational amplifier is connected to one end of the eleventh resistor, and the other end of the eleventh resistor and the other end of the fifth capacitor are grounded; the output terminal of the third operational amplifier is connected to the positive electrode of the second diode; the positive electrode of the power supply terminal of the third operational amplifier is connected to the power input terminal of the second light detection circuit, and the negative electrode of the power supply terminal of the third operational amplifier is grounded; the negative electrode of the second diode is connected to the control circuit.

[0018] In one embodiment, the drive control circuit includes a sixth capacitor, a twelfth resistor, a first drive chip and a plurality of switching tubes;

[0019] One end of the sixth capacitor, the power supply terminal of the first drive chip and the power input terminal of the drive control circuit are connected; the other end of the sixth capacitor is grounded; the controlled terminal of the first drive chip is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the control circuit; a plurality of power output terminals of the first drive chip are respectively connected to the first ends of the plurality of switching tubes in one-to-one correspondence; the grounding terminal of the first drive chip is grounded; the second ends of the plurality of switching tubes are connected to the plurality of LED lights in one-to-one correspondence; the controlled terminals of the plurality of switching tubes are connected to the control circuit.

[0020] In one embodiment, the keyboard lighting control circuit further includes a reminder light circuit. The power input terminal of the reminder light circuit is connected to the first power input terminal, and the controlled terminal of the reminder light circuit is connected to the control circuit;

[0021] The control circuit is further configured to count when receiving the induction signal, and control the reminder light circuit to emit lights of different colors according to the counting result.

[0022] In one embodiment, the reminder light circuit includes a thirteenth resistor, a fourteenth resistor, a seventh capacitor, a second driving chip, a red light-emitting diode, a blue light-emitting diode, and a green light-emitting diode;

[0023] Wherein, one end of the seventh capacitor, the power supply terminal of the second driving chip, and the power input terminal of the reminder light circuit are connected; the other end of the seventh capacitor is grounded; the controlled terminal of the second driving chip is connected to the thirteenth resistor, and the other end of the thirteenth resistor is connected to the control circuit; the first power output terminal of the second driving chip is connected to the positive electrode of the red light-emitting diode, the second power output terminal of the second driving chip is connected to the positive electrode of the blue light-emitting diode, and the third power output terminal of the second driving chip is connected to the positive electrode of the green light-emitting diode; the negative electrodes of the red light-emitting diode, the blue light-emitting diode, and the green light-emitting diode are connected to one end of the fourteenth resistor; the other end of the fourteenth resistor is grounded to the grounding terminal of the second driving chip.

[0024] In one embodiment, the keyboard lighting control circuit further includes a voltage conversion circuit. The power input terminal of the voltage conversion circuit is connected to the first power input terminal, and the power output terminal of the voltage conversion circuit is connected to the drive control circuit, the light detection circuit, the infrared induction circuit, and the control circuit; the voltage conversion circuit is configured to perform voltage conversion on the external power supply voltage input from the first power input terminal and then output it.

[0025] The present utility model further provides a keyboard, which includes the keyboard lighting control circuit as described above.

[0026] The technical solution of the present utility model adopts a keyboard lighting control circuit, which is applied to a keyboard. The keyboard includes multiple LED lights. The keyboard lighting control circuit includes a first power input terminal, a drive control circuit, a light detection circuit, an infrared induction circuit and a control circuit. Among them, the infrared induction circuit can detect whether there is a human body around by detecting the change of infrared radiation information around the keyboard. Specifically, when there is no human body around, the change of the infrared radiation information detected by the infrared induction circuit is within a preset range. At this time, the infrared induction circuit outputs a low level, and the control circuit controls the drive control circuit to have no output, and the multiple LED lights remain in the off state. When there is a human body around, the change of the infrared radiation information detected by the infrared induction circuit exceeds the preset range, and an induction signal is output to the control circuit. The control circuit outputs a PWM signal to control the drive control circuit, and the drive control circuit drives the multiple LED lights to light up according to the PWM signal. At the same time, the light detection circuit can detect the brightness of the keyboard environment and output light detection signals with different voltages to the control circuit according to the environmental brightness. The control circuit can adjust the duty cycle of the output PWM signal according to the voltage value of the light detection signal. For example, in a brighter environment, the voltage value of the output light detection signal is larger, and the duty cycle of the output PWM signal can be adjusted to decrease to lower the brightness of the multiple LED lights. In a darker environment, the voltage value of the output light detection signal is smaller, and the duty cycle of the output PWM signal can be adjusted to increase to increase the brightness of the multiple LED lights. It can be understood that the control circuit can make different adjustments to the duty cycle of the output PWM signal according to specific situations, such as adjusting the output PWM signal in different ways during the day and at night, which is not limited here. In this way, the adaptive adjustment of the multiple LED lights and the environmental brightness can be realized. The present utility model can control the keyboard backlight to turn off when there is no one, and can adjust the brightness of the backlight according to the environmental brightness when someone is using it. It can realize the automatic adjustment of the keyboard backlight, without the need for the user to manually adjust or repeatedly adjust, improving the efficiency of adjusting the keyboard backlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 FIG. is a schematic structural diagram of an embodiment of the keyboard lighting control circuit provided by the present utility model;

[0029] Figure 2Schematic diagram of another embodiment of the keyboard lighting control circuit provided by the present utility model;

[0030] Figure 3 Electronic circuit diagram of another embodiment of the keyboard lighting control circuit provided by the present utility model.

[0031] Explanation of the reference numerals in the attached drawings:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the attached drawings. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the attached drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0038] In the existing keyboard lighting control circuit, adjusting the backlight usually requires manual adjustment. When the user is not familiar with the keyboard or the ambient light is relatively dim, the user needs to adjust repeatedly or cannot find the adjustment key, which is likely to cause incorrect adjustment and affect work efficiency.

[0039] To solve the above problems, the present utility model proposes a keyboard lighting control circuit.

[0040] Please refer to Figure 1 , in an embodiment of the present utility model, the keyboard lighting control circuit is applied to a keyboard. The keyboard includes a plurality of LED lights. The keyboard lighting control circuit includes:

[0041] A first power input terminal;

[0042] A drive control circuit 10. The power input terminal of the drive control circuit 10 is connected to the first power input terminal, and a plurality of power output terminals of the drive control circuit 10 are respectively connected to the plurality of LED lights in one-to-one correspondence;

[0043] A light detection circuit 20. The power input terminal of the light detection circuit 20 is connected to the first power input terminal. The light detection circuit 20 is used to detect the light intensity of the external environment of the keyboard and output a light detection signal;

[0044] An infrared induction circuit 30. The power input terminal of the infrared induction circuit 30 is connected to the first power input terminal. The infrared induction circuit 30 is used to output an induction signal when the detected change in infrared radiation information exceeds a preset range;

[0045] A control circuit 40. The control circuit 40 is respectively connected to the drive control circuit 10, the light detection circuit 20, the infrared induction circuit 30 and the first power input terminal; the control circuit 40 is used to receive the induction signal and the light detection signal, and control the operation of the drive control circuit 10 according to the induction signal and the light detection signal.

[0046] It should be noted that this embodiment is used to achieve automatic adjustment of the illumination of multiple LED lights on the keyboard, specifically including brightness adjustment of multiple LED lights. Among them, the infrared sensing circuit 30 can detect whether there is a human body around by detecting changes in the infrared radiation information around the keyboard. Specifically, when there is no human body around, the change in the infrared radiation information detected by the infrared sensing circuit 30 is within a preset range. At this time, a low level is output, and the control circuit 40 controls the drive control circuit 10 to have no output, and multiple LED lights remain in the extinguished state. When there is a human body around, the change in the infrared radiation information detected by the infrared sensing circuit 40 exceeds the preset range, and an induction signal is output to the control circuit 40. The control circuit 40 outputs a PWM signal to control the drive control circuit 10, and the drive control circuit 10 outputs a drive power supply according to the PWM signal to drive multiple LED lights to light up. At the same time, the light detection circuit 20 can detect the brightness of the keyboard environment and output light detection signals with different voltages to the control circuit 40 according to the environmental brightness. The control circuit 40 can adjust the duty cycle of the output PWM signal according to the voltage value of the light detection signal. For example, in a brighter environment, the voltage value of the output light detection signal is larger, and the duty cycle of the output PWM signal can be adjusted to decrease to lower the brightness of multiple LED lights. In a darker environment, the voltage value of the output light detection signal is smaller, and the duty cycle of the output PWM signal can be adjusted to increase to increase the brightness of multiple LED lights. It can be understood that the control circuit 40 can make different adjustments to the duty cycle of the output PWM signal according to specific situations, such as adjusting the output PWM signal in different ways during the day and at night, which is not limited here. In this way, adaptive adjustment of multiple LED lights to the environmental brightness can be achieved. In this way, this embodiment can control the keyboard backlight to turn off when there is no one, and can adjust the brightness of the backlight according to the environmental brightness when someone is using it, realizing automatic adjustment of the keyboard backlight, without the need for the user to manually adjust or repeatedly adjust, improving the efficiency of adjusting the keyboard backlight.

[0047] It should be noted that this embodiment is not limited to only adjusting the brightness of the LED lights, but can also include adjusting the hue of the backlight. For example, in a low-light environment, the backlight is adjusted to a brighter warm color tone to provide a better keyboard lighting effect and reduce eye fatigue; in a bright environment, the backlight is adjusted to a darker cool color tone to reduce the irritation to the eyes while maintaining a clear keyboard visual effect. In this way, by combining light detection and infrared sensing, the color and brightness of the backlight can be automatically adjusted, achieving the effect of reducing the fatigue caused by the keyboard backlight to the eyes.

[0048] In this utility model, the infrared sensing circuit 30 can detect whether there is a human body around by detecting the change of infrared radiation information around the keyboard. Specifically, when there is no human body around, the change of the infrared radiation information detected by the infrared sensing circuit 30 is within a preset range. At this time, a low level is output, and the control circuit 40 controls the drive control circuit 10 to have no output, and multiple LED lights remain in the off state. When there is a human body around, the change of the infrared radiation information detected by the infrared sensing circuit 40 exceeds the preset range, and an induction signal is output to the control circuit 40. The control circuit 40 outputs a PWM signal to control the drive control circuit 10, and the drive control circuit 10 outputs a drive power supply according to the PWM signal to drive multiple LED lights to light up. At the same time, the light detection circuit 20 can detect the brightness of the keyboard environment and output a light detection signal with different voltages to the control circuit 40 according to the ambient brightness. The control circuit 40 can adjust the duty cycle of the output PWM signal according to the voltage value of the light detection signal. For example, in a brighter environment, the voltage value of the output light detection signal is larger, and the duty cycle of the output PWM signal can be adjusted to decrease to lower the brightness of multiple LED lights. In a darker environment, the voltage value of the output light detection signal is smaller, and the duty cycle of the output PWM signal can be adjusted to increase to increase the brightness of multiple LED lights. It can be understood that the control circuit 40 can make different adjustments to the duty cycle of the output PWM signal according to specific situations, such as adjusting the output PWM signal in different ways during the day and at night, which is not limited here. In this way, the adaptive adjustment of multiple LED lights and the ambient brightness can be realized. In this way, this utility model can control the keyboard backlight to turn off when there is no one, and can adjust the brightness of the backlight according to the ambient brightness when someone is using it, realizing the automatic adjustment of the keyboard backlight, without the need for the user to manually adjust or repeatedly adjust, improving the efficiency of adjusting the keyboard backlight.

[0049] Please refer to Figure 3 , in an embodiment of this utility model, the infrared sensing circuit 30 includes an infrared sensor U2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a first operational amplifier O1;

[0050] Wherein, one end of the first resistor R1 is connected to the power input terminal of the infrared sensing circuit 30, and the other end of the first resistor R1, the power terminal of the infrared sensor U2 are connected to one end of the first capacitor C1; the ground terminal of the infrared sensor U2 and the other end of the first capacitor C1 are grounded; the output terminal of the infrared sensor U2 is connected to one end of the second resistor R2; the other end of the second resistor R2 is connected to the non-inverting input terminal of the first operational amplifier O1; the inverting input terminal of the first operational amplifier O1, one end of the third resistor R3, and one end of the fourth resistor R4 are connected to one end of the third capacitor C3; the output terminal of the first operational amplifier O1, the other end of the fourth resistor R4, and the other end of the third capacitor C3 are connected to one end of the fifth resistor R5; the positive pole of the power supply terminal of the first operational amplifier O1 is connected to the power input terminal of the infrared sensing circuit 30, and the negative pole of the power supply terminal of the first operational amplifier O1 is grounded; the other end of the third resistor R3 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded; the other end of the fifth resistor R5 is connected to the control circuit 40.

[0051] It should be noted that the control circuit 40 in this embodiment may include a control chip U1, and the GPIO1 pin of the control chip U1 is connected to the infrared sensing circuit 30 to achieve communication connection with the infrared sensing circuit 30.

[0052] In this embodiment, when the infrared sensor U2 fails to detect a human body around, it outputs a low level, that is, the infrared sensing circuit 30 has no output. When the infrared sensor U2 detects a human body around, and at this time the change in the infrared radiation information exceeds the preset range, it outputs an induction signal of high level. Among them, the first resistor R1 can play a current limiting role, and the first capacitor C1 can stabilize the power input of the infrared sensor U2 and reduce the power supply noise. The circuit composed of the fourth resistor R4, the third capacitor C3, the third resistor R3 and the second capacitor C2 can adjust the gain of the first operational amplifier O1, compare and amplify the induction signal and then output it to the control chip U1. In this way, this embodiment can detect the change in the infrared radiation information of the environment around the keyboard, improve the accuracy of sensing the human body, and the stability of the induction signal output.

[0053] Please refer to Figure 2 , in an embodiment of the present invention, the light detection circuit 20 includes a first light detection circuit 21 and a second light detection circuit 22. The first light detection element of the first light detection circuit 21 and the second light detection element of the second light detection circuit 22 are symmetrically arranged on both side surfaces of the keyboard respectively; the first light detection circuit 21 is used to output a first light detection signal, and the second light detection circuit 22 is used to output a second light detection signal; the control circuit 40 is further used to control the operation of the drive control circuit 10 according to the first light detection signal and the second light detection signal.

[0054] It can be understood that the ambient light, the occlusion of the user, and the brightness of the display screen will all affect the detection of light. When setting up a light detection circuit 20, the detection of ambient light may be inaccurate. To enhance the accuracy of ambient light detection, this embodiment adopts a dual light detection element. The dual light detection element can be symmetrically arranged on both sides of the keyboard, and can more effectively sense the light at different angles and directions, and then send the detected first light detection signal and second light detection signal to the control circuit 40. In this embodiment, the control circuit 40 can set a delay time. When the voltage values of the first light detection signal and the second light detection signal are relatively stable within the delay time, the backlight emission is adjusted according to the light intensity of the current environment. In this embodiment, a first preset voltage value can be set. When the sum of the voltage values of the first light detection signal and the second light detection signal is greater than the first preset voltage value, the keyboard backlight is adjusted to the daytime mode. Specifically, multiple LED lights can be adjusted to emit cold light, or no light is emitted; a second preset voltage value can also be set. When the sum of the voltage values of the first light detection signal and the second light detection signal is less than the second preset voltage value, the keyboard backlight is adjusted to the night mode. Specifically, multiple LED lights can be adjusted to emit warm light, or the emitted light is weak to avoid hurting the eyes. In this way, this embodiment can more effectively sense the light at different angles and directions, and improves the accuracy of light detection.

[0055] Please refer to Figure 3 , in an embodiment of the present invention, the first light detection element is the first photosensitive resistor RA; the first light detection circuit 21 further includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fourth capacitor C4, a first diode D1, and a second operational amplifier O2;

[0056] Among them, one end of the first photosensitive resistor RA is connected to the power input terminal of the first light detection circuit 21; the other end of the first photosensitive resistor RA, one end of the sixth resistor R6, and one end of the seventh resistor R7 are connected. The other end of the sixth resistor R6 is grounded; the other end of the seventh resistor R7, one end of the fourth capacitor C4 are connected to the positive input terminal of the second operational amplifier O2; the negative input terminal of the second operational amplifier O2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is grounded together with the other end of the fourth capacitor C4; the output terminal of the second operational amplifier O2 is connected to the positive electrode of the first diode D1; the positive electrode of the power supply terminal of the second operational amplifier O2 is connected to the power input terminal of the first light detection circuit 21, and the negative electrode of the power supply terminal of the second operational amplifier O2 is grounded; the negative electrode of the first diode D1 is connected to the control circuit 40.

[0057] In this embodiment, the GPIO2 pin of the control chip U1 is connected to the first light detection circuit 21 to realize the communication connection with the first light detection circuit 21.

[0058] In this embodiment, when different lights are received, the resistance value of the first photosensitive resistor RA will change. For example, when stronger light is received, the resistance value of the first photosensitive resistor RA becomes smaller, the voltage division of the sixth resistor R6 increases, and the voltage input to the second operational amplifier O2 increases. When weaker light is received, the resistance value of the first photosensitive resistor RA becomes larger, the voltage division of the sixth resistor R6 decreases, and the voltage input to the second operational amplifier O2 decreases. Among them, the seventh resistor R7 and the fourth capacitor C4 can form a low-pass filter to enhance the stability of the input to the second operational amplifier O2, and the first diode D1 can protect the circuit. In this way, the second operational amplifier O2 can output a corresponding voltage signal according to the resistance value of the first photosensitive resistor RA to trigger the corresponding control operation of the control chip U1. The first light detection circuit 21 of this embodiment is relatively simple to implement and has strong stability.

[0059] Please refer to Figure 3 , in an embodiment of the present utility model, the first light detection element is the second photosensitive resistor RB; the first light detection circuit 21 further includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fifth capacitor C5, a second diode D2 and a third operational amplifier O3;

[0060] Among them, one end of the second photosensitive resistor RB is connected to the power input terminal of the second light detection circuit 22; the other end of the second photosensitive resistor RB, one end of the ninth resistor R9 and one end of the tenth resistor R10 are connected, and the other end of the ninth resistor R9 is grounded; the other end of the tenth resistor R10, one end of the fifth capacitor C5 and the non-inverting input terminal of the third operational amplifier O3 are connected; the inverting input terminal of the third operational amplifier O3 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 and the other end of the fifth capacitor C5 are grounded; the output terminal of the third operational amplifier O3 is connected to the positive electrode of the second diode D2; the positive electrode of the power supply terminal of the third operational amplifier O3 is connected to the power input terminal of the second light detection circuit 22, the negative electrode of the power supply terminal of the third operational amplifier O3 is grounded; the negative electrode of the second diode D2 is connected to the control circuit 40.

[0061] In this embodiment, the GPIO3 pin of the control chip U1 is connected to the second light detection circuit 22 to realize the communication connection with the second light detection circuit 22.

[0062] In this embodiment, when different lights are received, the resistance value of the second photosensitive resistor RB changes. For example, when stronger light is received, the resistance value of the second photosensitive resistor RB becomes smaller, then the voltage division of the ninth resistor R9 increases, and the voltage input to the third operational amplifier O3 increases. When weaker light is received, the resistance value of the second photosensitive resistor RB becomes larger, then the voltage division of the ninth resistor R9 decreases, and the voltage input to the third operational amplifier O3 decreases. Among them, the tenth resistor R10 and the fifth capacitor C5 can form a low-pass filter to enhance the stability of the input to the third operational amplifier O3, and the second diode D2 can protect the circuit. In this way, the third operational amplifier O3 can output a corresponding voltage signal according to the resistance value of the second photosensitive resistor RB to trigger the corresponding control operation of the control chip U1. The second light detection circuit 22 of this embodiment is relatively simple to implement and has strong stability.

[0063] Please refer to Figure 3 , in an embodiment of the present invention, the drive control circuit 10 includes a sixth capacitor C6, a twelfth resistor R12, a first drive chip U3, and multiple switching tubes;

[0064] Among them, one end of the sixth capacitor C6, the power supply terminal of the first drive chip U3 are connected to the power input terminal of the drive control circuit 10; the other end of the sixth capacitor C6 is grounded; the controlled terminal of the first drive chip U3 is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the control circuit 40; multiple power output terminals of the first drive chip U3 are respectively connected to the first ends of multiple switching tubes in one-to-one correspondence; the grounding terminal of the first drive chip U3 is grounded; the second ends of multiple switching tubes are connected to multiple LED lights in one-to-one correspondence; the controlled terminals of multiple switching tubes are connected to the control circuit 40.

[0065] In this embodiment, the GPIO4 pin of the control chip U1 is connected to the drive control circuit 10 to achieve communication connection with the drive control circuit 10. The power input terminals of multiple LED lights can be connected to the second ends of multiple switching tubes, and the power output terminals of multiple LED lights can be grounded through the eighteenth resistor R18.

[0066] In this embodiment, the drive control circuit 10 can control the brightness display and switch state of multiple LED lights. When the control circuit 40 sends different PWM signals to the first drive chip U3, different drive powers will be generated correspondingly at multiple power output terminals of the first drive chip U3. In this embodiment, M switch tubes can be used to control the lighting / extinguishing of M LED lights, and personalized settings of the backlight can be realized, such as the lighting of some LED lights and the extinguishing of some LED lights. Among them, the switch tube can be an NMOS tube. When a high level is output, the LED light can be lit, and when a low level is output, the LED light remains in the extinguished state. In this way, this embodiment can realize various control functions of the backlight and meet the personalized design of light emission, such as dynamic gradual change and flicker of light emission.

[0067] Please refer to Figure 2 , in an embodiment of the present utility model, the keyboard lighting control circuit further includes a warning light circuit 50. The power input terminal of the warning light circuit 50 is connected to the first power input terminal, and the controlled terminal of the warning light circuit is connected to the control circuit 40;

[0068] The control circuit 40 is further configured to count when receiving the induction signal, and control the warning light circuit 50 to emit lights of different colors according to the counting result.

[0069] It should be noted that the introduction of the warning light circuit 50 in this embodiment is mainly to remind the user to appropriately control the keyboard usage duration to avoid health problems that may be caused by excessive fatigue and long-term keyboard operation. Specifically, when the user uses the keyboard for a short time, the warning light circuit 50 can be set not to emit light or emit green light, indicating that the keyboard usage time is within the safe range and does not require much attention. When the user uses the keyboard for a moderate time, the warning light circuit 50 can be set to emit yellow or orange light, indicating that the keyboard usage time has reached a certain level, and it is recommended that the user take a proper rest or change the posture to relieve hand and eye fatigue. When the user uses the keyboard for too long, the warning light circuit 50 can be set to emit red light, indicating that the keyboard usage time has exceeded the safe range, and it is recommended that the user immediately stop keyboard operation and take proper rest and relaxation to protect hand and eye health. In this way, the user can understand their keyboard usage situation according to the color of the warning light and adjust the usage time in a timely manner to protect their health.

[0070] It should be noted that the control circuit 40 may internally include a counter, a comparator, a controller, and a clock circuit. Among them, the comparator can be used to compare the voltage value output by the infrared sensing circuit 30 with a preset voltage value, and output a high-level comparison signal when the voltage value output by the infrared sensing circuit 30 is greater than the preset voltage value. The clock circuit is used to provide a stable clock signal, and the counter can output a counting result according to the clock signal and the comparison signal. Thus, in this embodiment, the prompt lamp circuit 50 can be controlled to emit lights of different colors according to the counting result to remind the user of the usage duration of the keyboard.

[0071] Please refer to Figure 3 , in an embodiment of the present invention, the prompt lamp circuit 50 includes a thirteenth resistor R13, a fourteenth resistor R14, a seventh capacitor C7, a second driver chip U4, a red light-emitting diode DR, a blue light-emitting diode DB, and a green light-emitting diode DG;

[0072] Among them, one end of the seventh capacitor C7, the power supply terminal of the second driver chip U4 are connected to the power input terminal of the prompt lamp circuit 50; the other end of the seventh capacitor C7 is grounded; the controlled terminal of the second driver chip U4 is connected to one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the control circuit 40; the first power output terminal of the second driver chip U4 is connected to the positive electrode of the red light-emitting diode DR, the second power output terminal of the second driver chip U4 is connected to the positive electrode of the blue light-emitting diode DB, and the third power output terminal of the second driver chip U4 is connected to the positive electrode of the green light-emitting diode DG; the negative electrodes of the red light-emitting diode DR, the blue light-emitting diode DB, and the green light-emitting diode DG are connected to one end of the fourteenth resistor R14; the other end of the fourteenth resistor R14 is grounded to the ground terminal of the second driver chip U4.

[0073] In this embodiment, the GPIO5 pin of the control chip U1 is connected to the prompt lamp circuit 50 to achieve communication connection with the prompt lamp circuit 50.

[0074] In this embodiment, the principle of trichromatic color can be utilized to combine and emit prompt lights of different colors by controlling the light emission of the red light-emitting diode DR, the blue light-emitting diode DB, and the green light-emitting diode DG. Specifically, the control chip U1 can output a control signal to control the second driver chip U4, and the second driving signal can output different driving powers at the first power output terminal, the second power output terminal, and the third power output terminal respectively to control the red light-emitting diode DR, the blue light-emitting diode DB, and the green light-emitting diode DG to emit prompt lights of different intensities. For example, when the user uses the keyboard for a short time, the green light-emitting diode DG can be controlled to light up, and the red light-emitting diode DR and the blue light-emitting diode DB can be turned off to emit a green prompt light; when the user uses the keyboard for a moderate time, the red light-emitting diode DR and the green light-emitting diode DG can be controlled to light up, and the blue light-emitting diode DB can be turned off to emit a yellow prompt light; when the user uses the keyboard for too long, the red light-emitting diode DR can be controlled to light up, and the green light-emitting diode DG and the blue light-emitting diode DB can be turned off to emit a red prompt light. It can be understood that emitting green, yellow, and red prompt lights is only used to illustrate the principle, and prompt lights of gradient colors can be emitted according to the user's keyboard usage duration to more accurately prompt the user of the keyboard usage time. In this way, this embodiment can utilize the principle of trichromatic color to achieve light prompting, which is beneficial for the user to adjust the usage time in a timely manner and protect their own health.

[0075] Please refer to Figure 3 , in an embodiment of the present utility model, the keyboard light control circuit further includes a voltage conversion circuit 60. The power input terminal of the voltage conversion circuit 60 is connected to the first power input terminal, and the power output terminal of the voltage conversion circuit 60 is connected to the driving control circuit 10, the light detection circuit 20, the infrared sensing circuit 30, and the control circuit 40; the voltage conversion circuit 60 is used for converting the external power supply voltage input at the first power input terminal and then outputting.

[0076] In this embodiment, the voltage conversion circuit 60 can convert the voltage input from the first power input terminal and then output it to the drive control circuit 10, the light detection circuit 20, the infrared sensing circuit 30, and the control circuit 40 for power supply. In one embodiment, the voltage conversion circuit 60 includes an eighth capacitor C8, a ninth capacitor C9, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and a voltage conversion chip U5. One end of the eighth capacitor C8, one end of the fifteenth resistor R15, and the power input terminal of the voltage conversion chip U5 are connected to the first power input terminal. The other end of the eighth capacitor C8 and the ground terminal of the voltage conversion chip U5 are grounded. The output terminal of the voltage conversion chip U5, one end of the sixteenth resistor R16, and one end of the ninth capacitor C9 are connected to the power output terminal of the voltage conversion circuit 60. The other end of the sixteenth resistor R16 and one end of the seventeenth resistor R17 are connected to the feedback terminal of the voltage conversion chip U5. The other end of the seventeenth resistor R17 and the other end of the ninth capacitor C9 are grounded. In this embodiment, the voltage input from the first power input terminal can be converted and regulated and then output, which is beneficial to providing a reliable power supply.

[0077] The present utility model also proposes a keyboard, which includes the above-mentioned keyboard lighting control circuit. The specific structure of the keyboard lighting control circuit refers to the above-mentioned embodiment. Since this keyboard adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated herein one by one.

[0078] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the technical concept of the present utility model, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A keyboard lighting control circuit, characterized in that: Applied to a keyboard, the keyboard includes a plurality of LED lights, and the keyboard light control circuit includes: A first power input terminal; A drive control circuit, wherein a power input terminal of the drive control circuit is connected to the first power input terminal, and a plurality of power output terminals of the drive control circuit are connected to the plurality of LED lamps in a one-to-one correspondence; A light detection circuit, wherein a power input terminal of the light detection circuit is connected to the first power input terminal, and the light detection circuit is used to detect the light intensity of the external environment of the keyboard and output a light detection signal; an infrared sensing circuit, wherein a power input terminal of the infrared sensing circuit is connected to the first power input terminal, and the infrared sensing circuit is used to output a sensing signal when detecting that a change in infrared radiation information exceeds a preset range; A control circuit, wherein the control circuit is respectively connected to the drive control circuit, the light detection circuit, the infrared sensing circuit and the first power input terminal; the control circuit is used to receive the sensing signal and the light detection signal, and control the operation of the drive control circuit according to the sensing signal and the light detection signal.

2. The keyboard lighting control circuit according to claim 1, characterized in that: The infrared sensing circuit includes an infrared sensor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor and a first operational amplifier; Among them, one end of the first resistor is connected to the power input end of the infrared sensing circuit, and the other end of the first resistor and the power end of the infrared sensor are connected to one end of the first capacitor; the ground end of the infrared sensor and the other end of the first capacitor are grounded; the output end of the infrared sensor is connected to one end of the second resistor; the other end of the second resistor is connected to the positive input end of the first operational amplifier; the inverting input end of the first operational amplifier, one end of the third resistor, and one end of the fourth resistor are connected to one end of the third capacitor; the output end of the first operational amplifier, the other end of the fourth resistor, and the other end of the third capacitor are connected to one end of the fifth resistor; the positive pole of the power end of the first operational amplifier is connected to the power input end of the infrared sensing circuit, and the negative pole of the power end of the first operational amplifier is grounded; the other end of the third resistor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; the other end of the fifth resistor is connected to the control circuit.

3. The keyboard lighting control circuit according to claim 1, characterized in that: The light detection circuit includes a first light detection circuit and a second light detection circuit, and the first light detection element of the first light detection circuit and the second light detection element of the second light detection circuit are symmetrically arranged on the two side surfaces of the keyboard respectively; the first light detection circuit is used to output a first light detection signal, and the second light detection circuit is used to output a second light detection signal; the control circuit is also used to control the operation of the drive control circuit according to the first light detection signal and the second light detection signal.

4. The keyboard lighting control circuit as claimed in claim 3, characterized in that: The first light detection element is a first photoresistor; the first light detection circuit further includes a sixth resistor, a seventh resistor, an eighth resistor, a fourth capacitor, a first diode and a second operational amplifier; Among them, one end of the first photoresistor is connected to the power input end of the first light detection circuit; the other end of the first photoresistor and one end of the sixth resistor are connected to one end of the seventh resistor, and the other end of the sixth resistor is grounded; the other end of the seventh resistor and one end of the fourth capacitor are connected to the non-inverting input end of the second operational amplifier; the inverting input end of the second operational amplifier is connected to one end of the eighth resistor, and the other end of the eighth resistor and the other end of the fourth capacitor are grounded; the output end of the second operational amplifier is connected to the positive electrode of the first diode; the positive electrode of the power supply end of the second operational amplifier is connected to the power input end of the first light detection circuit, and the negative electrode of the power supply end of the second operational amplifier is grounded; the negative electrode of the first diode is connected to the control circuit.

5. The keyboard lighting control circuit as claimed in claim 3, characterized in that: The first light detection element is a second photoresistor; the first light detection circuit further includes a ninth resistor, a tenth resistor, an eleventh resistor, a fifth capacitor, a second diode and a third operational amplifier; Among them, one end of the second photoresistor is connected to the power input end of the second light detection circuit; the other end of the second photoresistor and one end of the ninth resistor are connected to one end of the tenth resistor, and the other end of the ninth resistor is grounded; the other end of the tenth resistor and one end of the fifth capacitor are connected to the non-inverting input end of the third operational amplifier; the inverting input end of the third operational amplifier is connected to one end of the eleventh resistor, and the other end of the eleventh resistor and the other end of the fifth capacitor are grounded; the output end of the third operational amplifier is connected to the positive electrode of the second diode; the positive electrode of the power supply end of the third operational amplifier is connected to the power input end of the second light detection circuit, and the negative electrode of the power supply end of the third operational amplifier is grounded; the negative electrode of the second diode is connected to the control circuit.

6. The keyboard lighting control circuit as claimed in claim 1, characterized in that: The driving control circuit includes a sixth capacitor, a twelfth resistor, a first driving chip and a plurality of switch tubes; Among them, one end of the sixth capacitor and the power supply end of the first driver chip are connected to the power supply input end of the drive control circuit; the other end of the sixth capacitor is grounded; the controlled end of the first driver chip is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the control circuit; the multiple power supply output ends of the first driver chip are respectively connected to the first ends of the multiple switch tubes in a one-to-one correspondence; the ground end of the first driver chip is grounded; the second ends of the multiple switch tubes are connected to the multiple LED lamps in a one-to-one correspondence; and the controlled ends of the multiple switch tubes are connected to the control circuit.

7. The keyboard lighting control circuit as claimed in claim 1, characterized in that: The keyboard light control circuit further comprises a prompt light circuit, wherein a power input terminal of the prompt light circuit is connected to the first power input terminal, and a controlled terminal of the prompt light circuit is connected to the control circuit; The control circuit is also used to count when receiving the sensing signal, and control the warning light circuit to emit lights of different colors according to the counting result.

8. The keyboard lighting control circuit as claimed in claim 7, characterized in that: The warning light circuit includes a thirteenth resistor, a fourteenth resistor, a seventh capacitor, a second driving chip, a red light emitting diode, a blue light emitting diode and a green light emitting diode; Among them, one end of the seventh capacitor and the power supply end of the second driving chip are connected to the power supply input end of the warning light circuit; the other end of the seventh capacitor is grounded; the controlled end of the second driving chip is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the control circuit; the first power supply output end of the second driving chip is connected to the positive electrode of the red light-emitting diode, the second power supply output end of the second driving chip is connected to the positive electrode of the blue light-emitting diode, and the third power supply output end of the second driving chip is connected to the positive electrode of the green light-emitting diode; the cathode of the red light-emitting diode, the cathode of the blue light-emitting diode, and the cathode of the green light-emitting diode are connected to one end of the fourteenth resistor; the other end of the fourteenth resistor is grounded to the ground end of the second driving chip.

9. The keyboard lighting control circuit as claimed in claim 1, characterized in that: The keyboard light control circuit also includes a voltage conversion circuit, the power input end of the voltage conversion circuit is connected to the first power input end, and the power output end of the voltage conversion circuit is connected to the drive control circuit, the light detection circuit, the infrared sensing circuit and the control circuit; the voltage conversion circuit is used to convert the external power supply voltage input from the first power input end and output it.

10. A keyboard, characterized in that: The keyboard comprises the keyboard lighting control circuit as claimed in any one of claims 1 to 9.

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