CN219107709U - Keyboard backlight brightness adjusting circuit, keyboard and electronic equipment - Google Patents
Keyboard backlight brightness adjusting circuit, keyboard and electronic equipment Download PDFInfo
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- CN219107709U CN219107709U CN202223467398.9U CN202223467398U CN219107709U CN 219107709 U CN219107709 U CN 219107709U CN 202223467398 U CN202223467398 U CN 202223467398U CN 219107709 U CN219107709 U CN 219107709U
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Abstract
The utility model provides a keyboard backlight brightness adjusting circuit, a keyboard and electronic equipment, comprising: the keyboard comprises a controller, a filter loop, a light-emitting unit configured on the keyboard and a switch loop; the output end of the controller is electrically connected with the control end of the switch circuit, the input end of the light-emitting unit is used for being connected with a power supply, the filter circuit is configured between the power supply and the input end of the light-emitting unit, the input end of the switch circuit is electrically connected with the output end of the light-emitting unit, and the output end of the switch circuit is grounded; the light emitting unit is configured to change the brightness degree based on the duty ratio of the PWM signal output by the controller, so that the problems of complex backlight brightness adjustment and few gears of the keyboard in the prior art are solved.
Description
Technical Field
The present utility model relates to the field of electronic power, and in particular, to a keyboard backlight brightness adjusting circuit, a keyboard and an electronic device.
Background
The backlight keyboard originates from a common keyboard, and under the driving of the domestic game market, in order to meet the requirements of more and higher players, keyboard developers begin to research into a multifunctional keyboard. The backlight keyboard is arranged, each key of the keyboard is made of special plastic, the black part has good light shielding performance, and the white part has strong transparency, so that the basic functions of the backlight keyboard are realized. The backlight keyboard is mainly characterized in that the keyboard keys or the panel emit light, so that the backlight keyboard is quite convenient for people handling transactions at night, key letters can be clearly seen under the condition that the lamp is not turned on at night, and the keyboard is attractive in appearance;
the BackLight source of the BackLight keyboard is different from an LCD BackLight source (BackLight), the LCD BackLight source (BackLight) is a light source positioned behind a Liquid Crystal Display (LCD), and the BackLight source of the BackLight keyboard is embedded into a designed keyboard card slot by adopting a high-brightness light emitting diode, in the prior art, the brightness of the BackLight of the keyboard needs to be changed, the power supply voltage of a BackLight loop needs to be adjusted or the current in the BackLight loop needs to be changed, more complicated loop and software control is needed, and the adjustable gear is not too many.
In view of this, the present application is presented.
Disclosure of Invention
The utility model discloses a keyboard backlight brightness adjusting circuit, a keyboard and electronic equipment, and aims to solve the problems that in the prior art, the backlight brightness of a keyboard is complex to adjust and gears are not many.
The first embodiment of the present utility model provides a keyboard backlight brightness adjusting circuit, comprising: the keyboard comprises a controller, a filter loop, a light-emitting unit configured on the keyboard and a switch loop;
the output end of the controller is electrically connected with the control end of the switch circuit, the input end of the light-emitting unit is used for being connected with a power supply, the filter circuit is configured between the power supply and the input end of the light-emitting unit, the input end of the switch circuit is electrically connected with the output end of the light-emitting unit, and the output end of the switch circuit is grounded;
wherein the light emitting unit is configured to change a degree of brightness based on a duty ratio of the PWM signal output from the controller.
Preferably, the filter loop comprises a first capacitor;
the first end of the first capacitor is electrically connected with the power supply, and the second end of the first capacitor is grounded.
Preferably, the switching circuit includes: the first resistor, the second resistor, the third resistor, the second capacitor and the MOS tube;
the output end of the controller is electrically connected with the first end of the first resistor, the second end of the first resistor is electrically connected with the G electrode of the MOS tube, the second end of the first resistor is grounded through the second capacitor, the second end of the first resistor is grounded through the second resistor, the S electrode of the MOS tube is grounded, and the D electrode of the MOS tube is connected with the output end of the light-emitting unit.
Preferably, the MOS transistor is configured such that the light emitting unit is lit when turned on.
Preferably, the MOS tube is an N-type MOS tube.
Preferably, the light emitting unit is a light emitting diode.
The second embodiment of the present utility model provides a keyboard, which includes a keyboard backlight brightness adjusting circuit as described in any one of the above.
A third embodiment of the utility model provides an electronic device comprising a power supply, and a keyboard as described above, wherein the power supply is configured to supply power to the keyboard.
According to the adjusting circuit for the backlight brightness of the keyboard, the keyboard and the electronic equipment, the controller is configured to provide the PWM signals for the switch loop, so that the switch loop acts between the on position and the off position, when the switch loop is in the on position, the light-emitting unit arranged on the keyboard is lightened, when the switch loop is in the off position, the light-emitting unit does not emit light, wherein the light-emitting unit emits light in a gradual change process, when a user needs to obtain brightness level, different brightness can be obtained by adjusting the duty ratio of the PWM, and the problems that the backlight brightness of the keyboard is complex to adjust and the gear is not too many in the prior art are solved.
Drawings
Fig. 1 is a schematic diagram of a circuit for adjusting backlight brightness of a keyboard according to a first embodiment of the present utility model;
FIG. 2 is a waveform diagram of the PWM signal of 0V according to the present utility model;
FIG. 3 is a waveform diagram of the PWM signal of 3.3V according to the present utility model;
fig. 4 is a waveform diagram of the PWM signal provided by the present utility model with a duty cycle of 50%.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
The utility model discloses a keyboard backlight brightness adjusting circuit, a keyboard and electronic equipment, and aims to solve the problems that in the prior art, the backlight brightness of a keyboard is complex to adjust and gears are not many.
Referring to fig. 1, a first embodiment of the present utility model provides a circuit for adjusting backlight brightness of a keyboard, comprising: a controller, a filter circuit 2, a light emitting unit 1 for being arranged on a keyboard, and a switching circuit 3;
the output end of the controller is electrically connected with the control end of the switch circuit 3, the input end of the light-emitting unit 1 is used for being connected with a power supply, the filter circuit 2 is configured between the power supply and the input end of the light-emitting unit 1, the input end of the switch circuit 3 is electrically connected with the output end of the light-emitting unit 1, and the output end of the switch circuit 3 is grounded;
wherein the light emitting unit 1 is configured to change the degree of brightness based on the duty ratio of the PWM signal outputted from the controller.
It should be noted that, with the healthy development of the game environment, the inventor finds that more and more terminal peripherals have the effect of light conversion, for example, many mechanical keyboards are designed on the market to have a slot for placing the light emitting unit 1, however, the brightness adjustment of the light emitting unit 1 configured on the mechanical keyboard adjusts the brightness based on changing the voltage of its power supply or the current in its circuit, however, it needs a more loaded circuit and software control, and the adjustable gear is not more.
In this embodiment, the controller may be a knock-in module of an electronic device, for example, a STM32 series single-chip microcomputer, which is capable of outputting a PWM signal, where the switch circuit 3 is capable of operating between an on position and an off position when receiving the PWM signal, where the light emitting unit 1 disposed on the keyboard is turned on, specifically, the output end of the power supply, the light emitting unit 1, and the switch circuit 3 form a path, where the light emitting unit 1 is turned on, and where the light emitting unit 1 cannot form a path to be turned on in the off position, and where the light emitting unit 1 may be a light emitting diode, and of course, in other embodiments, may be other types of light emitting units 1, where the light emission of the LED has a gradual change process, and when a user needs to obtain a brightness level, different brightness may be obtained by adjusting a duty ratio of PWM, so as to solve the problem that in the prior art, the backlight adjustment of the keyboard is complicated and the backlight has a small number of steps;
in one possible embodiment of the utility model, the filter loop 2 may comprise a first capacitance C1;
the first end of the first capacitor C1 is electrically connected with the power supply, and the second end of the first capacitor C1 is grounded.
It should be noted that, the first capacitor C1 is used to filter noise between the power supply and the light emitting unit 1 to avoid damaging the light emitting unit 1, and of course, in other embodiments, the filter circuit 2 may be further formed by other electronic components, which are not limited herein, but all the solutions are within the scope of the present utility model.
In one possible embodiment of the utility model, the switching circuit 3 comprises: the first resistor R1, the second resistor R2, the third resistor R3, the second capacitor C2 and the MOS tube Q1;
the output end of the controller is electrically connected with the first end of the first resistor R1, the second end of the first resistor R1 is electrically connected with the G electrode of the MOS tube Q1, the second end of the first resistor R1 is grounded through the second capacitor C2, the second end of the first resistor R1 is grounded through the second resistor R2, the S electrode of the MOS tube Q1 is grounded, and the D electrode of the MOS tube Q1 is connected with the output end of the light emitting unit 1.
It should be noted that, the first resistor R1 and the second resistor R2 are voltage dividing resistors, the third resistor R3 is a current limiting resistor, and the second capacitor C2 is a filter capacitor, where the third resistor R3 is used for adjusting the current in the loop, and it should be understood that the specification of the third resistor R3 may be selected during installation to determine the upper and lower limits of the backlight brightness of the keyboard.
With continued reference to fig. 1, in the present embodiment, the MOS transistor Q1 is configured such that the light emitting unit 1 is turned on when turned on, and it should be noted that the power supply, A, E, D and the formation of the path are turned on when the MOS transistor Q1 is turned on, and at this time, the light emitting unit 1 is turned on.
Referring to fig. 2, when the point B PWM signal is 0V, the duty ratio is 0%, the MOS transistor Q1 is in the off state, and at this time, the power supply voltage of the light emitting unit 1 on the keyboard is 0V, and the keyboard light emitting unit 1 does not emit light.
Referring to fig. 3, when the point B PWM signal is 3.3V, the duty ratio is 100%, the MOS transistor Q1 is in the on state, and at this time, the power supply voltage of the light emitting unit 1 on the keyboard is 5V, and the keyboard light emitting unit 1 emits light.
Referring to fig. 4, when the duty ratio of the point B is 50%, the MOS transistor Q1 is switched between on and off continuously, and the LED brightness of the keyboard is reduced by half due to the gradual change of the light emitting of the LED, and other brightness is needed to be obtained in the same way, so that different brightness can be obtained by adjusting the duty ratio of the PWM.
In one possible embodiment of the present utility model, the MOS transistor Q1 may be an N-type MOS transistor Q1.
It should be noted that, in other embodiments, the MOS transistor Q1 may also be a P-type MOS transistor Q1, which may be correspondingly configured according to actual situations, and the circuit structure of which is correspondingly changed, and these schemes are all within the protection scope of the present utility model.
The second embodiment of the present utility model provides a keyboard, which includes a keyboard backlight brightness adjusting circuit as described in any one of the above.
A third embodiment of the utility model provides an electronic device comprising a power supply, and a keyboard as described above, wherein the power supply is configured to supply power to the keyboard.
According to the adjusting circuit for the backlight brightness of the keyboard, the keyboard and the electronic equipment, the controller is configured to provide the PWM signals for the switch loop, so that the switch loop acts between the on position and the off position, when the switch loop is in the on position, the light-emitting unit arranged on the keyboard is lightened, when the switch loop is in the off position, the light-emitting unit does not emit light, wherein the light-emitting unit emits light in a gradual change process, when a user needs to obtain brightness level, different brightness can be obtained by adjusting the duty ratio of the PWM, and the problems that the backlight brightness of the keyboard is complex to adjust and the gear is not too many in the prior art are solved.
The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model.
Claims (8)
1. A keyboard backlight brightness adjusting circuit, comprising: the keyboard comprises a controller, a filter loop, a light-emitting unit configured on the keyboard and a switch loop;
the output end of the controller is electrically connected with the control end of the switch circuit, the input end of the light-emitting unit is used for being connected with a power supply, the filter circuit is configured between the power supply and the input end of the light-emitting unit, the input end of the switch circuit is electrically connected with the output end of the light-emitting unit, and the output end of the switch circuit is grounded;
wherein the light emitting unit is configured to change a degree of brightness based on a duty ratio of the PWM signal output from the controller.
2. The circuit for adjusting backlight brightness of a keyboard according to claim 1, wherein the filter circuit comprises a first capacitor;
the first end of the first capacitor is electrically connected with the power supply, and the second end of the first capacitor is grounded.
3. The keyboard backlight brightness adjusting circuit according to claim 1, wherein the switching circuit comprises: the first resistor, the second resistor, the third resistor, the second capacitor and the MOS tube;
the output end of the controller is electrically connected with the first end of the first resistor, the second end of the first resistor is electrically connected with the G electrode of the MOS tube, the second end of the first resistor is grounded through the second capacitor, the second end of the first resistor is grounded through the second resistor, the S electrode of the MOS tube is grounded, and the D electrode of the MOS tube is connected with the output end of the light-emitting unit.
4. A keyboard backlight brightness adjusting circuit according to claim 3, wherein the MOS transistor is configured such that the light emitting unit is turned on when turned on.
5. The keyboard backlight brightness adjusting circuit according to claim 3, wherein the MOS tube is an N-type MOS tube.
6. The circuit of claim 1, wherein the light emitting unit is a light emitting diode.
7. A keyboard comprising a keyboard backlight brightness adjusting circuit according to any one of claims 1 to 6.
8. An electronic device comprising a power supply, and the keyboard of claim 7, wherein the power supply is configured to supply power to the keyboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223467398.9U CN219107709U (en) | 2022-12-23 | 2022-12-23 | Keyboard backlight brightness adjusting circuit, keyboard and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223467398.9U CN219107709U (en) | 2022-12-23 | 2022-12-23 | Keyboard backlight brightness adjusting circuit, keyboard and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219107709U true CN219107709U (en) | 2023-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223467398.9U Active CN219107709U (en) | 2022-12-23 | 2022-12-23 | Keyboard backlight brightness adjusting circuit, keyboard and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219107709U (en) |
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2022
- 2022-12-23 CN CN202223467398.9U patent/CN219107709U/en active Active
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