CN216775068U - Key lamp control circuit and key lamp control device - Google Patents

Abstract

The utility model provides a key lamp control circuit which comprises at least two key lamp control branches and a controller, wherein each key lamp control branch comprises a key and an LED lamp, and the controller comprises a public end and at least two independent ends. The controller is used for outputting a first level signal at the independent end and outputting a second level signal at the common end when the key lamp control circuit starts to work so as to enable the key lamp control circuit to be in a preparation state, wherein the first level signal is opposite to the second level signal; the key is used for conducting the independent end and the public end of the controller when being triggered; the LED lamp is used for lighting when a first end of the LED lamp is a first level signal and a second end of the LED lamp is a second level signal; the controller is also used for reading the signals of each independent end in real time in the preparation state and adjusting the level state of each independent end and the common end according to the signals of each independent end so as to control the working state of the LED lamp. The key lamp control circuit can reduce the occupied quantity of I/O and save the design cost.

Description

Key lamp control circuit and key lamp control device

Technical Field

The embodiment of the utility model relates to the technical field of electronic circuits, in particular to a key lamp control circuit and a key lamp control device.

Background

At present, in each field, the circuit application that combines button control LED lamp operating condition (bright/go) as the main control component through controller (like the singlechip) is very general. In the prior art, in order to make the design process simpler, the key identification and the control of the operating state of each LED lamp are usually implemented through different I/O ports in the controller, which results in a larger number of occupied I/O ports. In the actual working condition, in order to save the cost, the number of the I/O ports of the controller selected for use in the control system is limited, so that how to reduce the number of the I/O ports under the condition that the number of the I/O ports is limited, the original functional requirements of the key lamp control circuit are met, the design cost is saved, and the problem to be solved urgently is solved.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a key lamp control circuit and a lamp control device, which can reduce the using number of I/O ports of a controller and save the design cost under the condition of meeting the same functional requirements.

In a first aspect, a key lamp control circuit is provided, which includes at least two key lamp control branches and a controller, each key lamp control branch includes a key and an LED lamp, and the controller includes a common terminal and at least two independent terminals, wherein the common terminal and the independent terminals are input/output ports of the controller.

In each key lamp control branch, the first end of the LED lamp is connected with an independent end of the controller and the second end of the key respectively, and the second end of the LED lamp is connected with the first end of the key and the public end of the controller respectively.

The controller is used for outputting a first level signal at an independent end of the key-press light control circuit and outputting a second level signal at a public end of the key-press light control circuit when the key-press light control circuit starts to work so as to enable the key-press light control circuit to be in a preparation state, wherein the first level signal is opposite to the second level signal, and the controller can obtain the level signal of the independent end when and only when the key-press light control circuit is in the preparation state.

When the key is triggered, the independent end and the common end of the controller are conducted, so that the independent end of the controller receives a level signal of the common end; the LED lamp is used for lighting when the first end of the LED lamp is a first level signal and the second end of the LED lamp is a second level signal.

The controller is further configured to obtain a signal of each independent end of the controller in real time in the preparation state, and set a first independent end as a second level signal and maintain a preset time when the first independent end exists in each independent end, where the first independent end is an independent end whose level signal is the second level signal; setting the common end of the first level signal as a first level signal and maintaining the first level signal for a preset time; and when the preset time is reached, setting the first independent end as a first level signal and the public end as a second level signal, and continuously acquiring the signal of each independent end in real time.

In some embodiments, the key lamp control branch further comprises an isolation circuit.

The first end of the isolation circuit is connected with the second end of the key, and the second end of the isolation circuit is respectively connected with the first end of the LED lamp and the independent end connected with the first end of the LED lamp; the isolation circuit is used for preventing the level signals of the independent end and the common end of the controller from interfering with each other.

In some embodiments, the key lamp control branch further comprises a current limiting circuit.

The first end of the current limiting circuit is respectively connected with the independent end of the controller connected with the key lamp control branch and the second end of the key, and the second end of the current limiting circuit is connected with the first end of the LED lamp; the current limiting circuit is used for limiting current.

In some embodiments, the isolation circuit is a diode when the first level is a low level.

The anode of the diode is connected with the second end of the key, and the cathode of the diode is respectively connected with the first end of the LED lamp and the independent end of the controller connected with the first end of the LED lamp.

In some embodiments, the current limiting circuit includes a resistor.

The first end of the resistor is connected with the independent end of the controller connected with the LED lamp and the second end of the key respectively, and the second end of the resistor is connected with the first end of the LED lamp.

In some embodiments, the controller is a single chip.

In a second aspect, a key lamp control device is provided, which includes a key lamp module and a control module, wherein the key lamp module includes a first socket and a key lamp control circuit, and the control module includes a second socket and a controller.

The key lamp control circuit is connected with the input end of the first row of plugs, the output end of the first row of plugs is connected with the input end of the second row of plugs, and the output end of the second row of plugs is connected with the controller.

Different from the prior art, the embodiment of the utility model provides a key lamp control circuit, which comprises at least two (assumed to be N) key lamp control branches and a controller, wherein each key lamp control branch comprises a key circuit and an LED lamp circuit, each key lamp control branch is connected with an independent I/O port of the controller and is connected with a common I/O port of the controller, the circuit can meet the control requirement only by occupying (N +1) I/O ports, and does not need to be additionally grounded or added with components, compared with the technical schemes of realizing key identification and control of the working state of each LED lamp (the number of occupied I/O ports is 2N) by utilizing different I/O ports or reducing the number of used I/O ports by additionally arranging additional components and the like in the prior art, the number of used I/O ports of the controller is reduced, but also can save space and reduce additional wiring and components, thereby saving the design cost.

Drawings

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

Fig. 1 is a schematic block diagram of a key lighting circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a key lighting circuit according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a key lighting circuit according to another embodiment of the present invention;

FIG. 4 is a schematic block diagram of a key lighting circuit according to another embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a key lighting circuit according to another embodiment of the present invention;

fig. 6 is a schematic block diagram of a key lamp control device according to an embodiment of the present invention.

Detailed Description

The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the utility model in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.

In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It should be noted that, if not conflicted, the various features of the embodiments of the utility model may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.

In a first aspect, referring to fig. 1, the key light control circuit 10 in fig. 1 includes N key light control branches (101-10N, where N ≧ 2, and 10N denotes the nth key light control branch in the key light control circuit 10) and a controller 200, each of the key light control branches includes a key and an LED lamp, the controller 200 includes a common terminal (COM) and at least N independent terminals (I/O1-I/ON), each of the independent terminals is connected to one of the key light control branches. It should be noted that, in this embodiment, the common port and the independent port of the controller 200 are both input/output ports (i.e., I/O ports) of the controller 200, and are named as the common port or the independent port only according to the connection manner of the common port and the key lamp control branch, so as to facilitate those skilled in the art to understand the technical solution of the present application.

In each of the key lamp control branches, a first end of each LED lamp is connected to an independent end of the controller 200 and a second end of each key, and a second end of each LED lamp is connected to the first end of each key and a common end of the controller 200.

The controller 200 is configured to output a first level signal to each independent end of the controller 200 and a second level signal to the common end of the controller 200 when the key lamp control circuit 10 starts to operate, so that the key lamp control circuit 10 is in a ready state, where the first level signal is opposite to the second level signal, and when and only when the key lamp control circuit is in the ready state (i.e., the independent end of the controller 200 is the first level signal and the common end of the controller 200 is the second level signal), the controller 200 may obtain the level signal of each independent end in real time, that is, the I/O port of the controller 200 operates in a time-division multiplexing mode, so as to avoid confusion of the operating state of the key lamp control circuit 10. In this embodiment, if the cathode of the LED lamp is connected to the independent end of the controller 200, the first level signal is a low level signal; and if the anode of the LED lamp is connected to the independent terminal of the controller 200, the first level signal is a high level signal.

When the key is triggered, the connection between the independent end connected to the LED lamp of the key lamp control branch and the common end is conducted, so that the independent end receives the level signal of the common end of the controller 200.

When the first end of the LED lamp is the first level signal and the second end of the LED lamp is the second level signal, and the first level signal and the second level signal meet the conduction condition of the LED lamp, the LED lamp is lightened.

The controller 200 is further configured to obtain a level signal of each independent end of the controller 200 in real time when the key lamp control circuit 10 is in a ready state, and set a first independent end as a second level signal when the first independent end exists in each independent end, and maintain a preset time (e.g., 5ms), where the first independent end is an independent end whose level signal is the second level signal; meanwhile, the common terminal of the controller 200 is set to be the first level signal and maintained for the preset time; when the preset time is reached, the first independent end is set as a first level signal, and the public end of the controller 200 is set as a second level signal (i.e. the key lamp control circuit 10 enters the preparation state again), and the level signals of each independent end of the controller 200 are continuously read in real time.

The key lamp control circuit 10 operates according to the following principle:

when the key lamp control circuit 10 starts to work, the controller 200 sets each independent end as a first level signal and sets the common end as a second level signal, so that the key lamp control circuit 10 is in a ready state, in which the LED lamp LED is in an unlit state, the controller 200 reads the signal of each independent end in real time, when the first level signal of one independent end in the ready state is changed into the second level signal, it indicates that the key in the key lamp control branch connected to the independent end is triggered, the controller 200 sets the independent end as the second level signal for a preset time (e.g. 5ms) correspondingly, and sets the common end as the first level signal for the preset time, at this time, the LED lamp is lit within the preset time.

When the preset time is reached, the controller 200 sets the independent end as the first level signal and sets the common end as the second level signal, so that the key lamp control circuit 10 enters the preparation state again, at this time, the LED lamp is turned off, and the controller 200 continues to acquire the level signal of each independent end in real time.

It should be noted that, in order to prevent the operating state of the key lamp control circuit 10 from being confused, the controller 200 adopts an operating mode in which the I/O ports are multiplexed in time, that is, when the independent I/O port of the controller 200 is used for driving the LED lamp to light, the controller 200 does not read the level state of the independent I/O port; only when the key lamp control circuit 10 is restored to the ready state (i.e., the independent end of the controller 200 is the first level signal and the common end is the second level signal, and the LED lamp is turned off at this time, i.e., the I/O port does not perform the driving task), the controller 200 obtains the level signal of the independent I/O port thereof in real time (i.e., whether the key is triggered is determined by the type of the level signal of the I/O port), thereby avoiding that the operating state of the key lamp control circuit 10 is affected by the key malfunction during the lighting of the LED lamp.

Different from the prior art, the embodiment of the utility model provides a key lamp control circuit, which comprises at least two (assumed to be N) key lamp control branches and a controller, wherein each key lamp control branch comprises a key and an LED lamp, each key lamp control branch is connected with an independent I/O port of the controller and is connected with a common I/O port of the controller, the circuit can meet the control requirement only by occupying (N +1) I/O ports, and does not need to be additionally grounded or added with components, compared with the technical scheme that the key identification and the working state control of each LED lamp (the occupied number of the I/O ports is 2N) are realized by utilizing different I/O ports in the prior art or the number of the I/O ports is reduced by additionally arranging additional components, the number of the I/O ports of the controller is reduced, but also can save space and reduce additional wiring and components, thereby saving the design cost.

In some embodiments, referring to fig. 2 and 3 together, the key control circuit 10 in fig. 2 and 3 includes two key control branches (i.e., a first key branch 101 and a second key branch 102), and each key control branch includes a key and an LED lamp. Specifically, as shown in fig. 2 and 3, the first key lamp control branch 101 includes a first key S1 and a first LED lamp LED1, and the second key lamp control branch 102 includes a second key S2 and a second LED lamp LED 2.

The first end of the first LED lamp LED1 is connected to the first independent end (I/O1) of the controller 200 and the second end of the first button S1, the second end of the first LED lamp LED1 is connected to the first end of the first button S1, the first end of the second button S2, the second end of the second LED lamp LED2 and the common end of the controller 200, and the first end of the second LED lamp LED2 is connected to the second independent end (I/O2) of the controller 200 and the second end of the second button S2.

It should be noted that, when the first level is a low level, as shown in fig. 2, a first end of the first LED lamp LED 1/the second LED lamp LED2 corresponds to an anode of the LED lamp, and a second end of the first LED lamp LED 1/the second LED lamp LED2 corresponds to a cathode of the LED lamp; when the first level is a high level, as shown in fig. 3, the first end of the first LED lamp LED 1/the second LED lamp LED2 corresponds to the cathode of the LED lamp, and the second end of the first LED lamp LED 1/the second LED lamp LED2 corresponds to the anode of the LED lamp.

The operating principle of the key lighting circuit 10 shown in fig. 2 is as follows:

when the key lamp control circuit 10 starts to work, the controller 200 sets the first independent end (I/O1) and the second independent end (I/O2) as low level signals and sets the common end (COM) as high level signals, and in this state, the first LED lamp LED1 and the second LED lamp LED2 are not turned on; the controller 200 reads the states of the first independent terminal (I/O1) and the second independent terminal (I/O2) in real time, when the first independent terminal (I/O1)/the second independent terminal (I/O2) changes to high level, it indicates that the first key S1/the second key S2 is triggered, the controller 200 sets the first independent terminal (I/O1)/the second independent terminal (I/O2) to high level signal for a preset time (e.g. 5ms) and sets the common terminal (COM) to low level signal for the preset time, and at this time, the first LED lamp LED 1/the second LED lamp LED2 lights up within the preset time.

The operating principle of the key lighting circuit 10 shown in fig. 3 is as follows:

when the key lamp control circuit 10 starts to work, the controller 200 sets the first independent end (I/O1) and the second independent end (I/O2) to high level and sets the common end (COM) to low level signal, and in this state, the first LED lamp LED1 and the second LED lamp LED2 are not turned on; the controller 200 reads the states of the first independent terminal (I/O1) and the second independent terminal (I/O2) in real time, when the first independent terminal (I/O1)/the second independent terminal (I/O2) changes to a low level, it indicates that the first key S1/the second key S2 is triggered, the controller 200 sets the first independent terminal (I/O1)/the second independent terminal (I/O2) to a low level signal for a preset time (e.g., 5ms) and sets the common terminal (COM) to a high level signal for the preset time, and at this time, the first LED lamp LED 1/the second LED lamp LED2 lights up within the preset time.

In some embodiments, referring to fig. 4, the key lighting circuit 10 in fig. 4 includes N key lighting branches (101-10N), and each key lighting branch further includes an isolation circuit.

The first end of the isolation circuit is connected with the second end of the key, and the second end of the isolation circuit is respectively connected with the first end of the LED lamp and the independent end of the controller 200.

The isolation circuit is used for isolating the level signals of the independent end and the common end of the controller 200, so as to avoid the influence on the working state of the LED lamp caused by the mutual interference of the level signal of the common end of the controller 200 and the level signal of the independent end when the corresponding key is pressed again during the lighting period of the LED lamp.

In some embodiments, referring to fig. 4 again, each key lamp control branch further includes a current limiting circuit.

The first end of the current limiting circuit is respectively connected with the independent end of the controller 200 connected with the key branch where the current limiting circuit is located and the second end of the key, and the second end of the current limiting circuit is connected with the first end of the LED lamp; the current limiting circuit is used for limiting current so as to prevent the LED lamp from being burnt out through large current.

When the first level signal is a low level signal, a first end of the LED lamp corresponds to an anode of the LED lamp, and a second end of the LED lamp corresponds to a cathode of the LED lamp; when the first level signal is a high level signal, the first end of the LED lamp corresponds to the cathode of the LED lamp, and the second end of the LED lamp corresponds to the anode of the LED lamp.

In some embodiments, referring to fig. 5, fig. 5 is a schematic circuit diagram illustrating a further key light control circuit, in which the key light control circuit 10 in fig. 5 includes two key light control branches (i.e., a first key light control branch 101 and a second key light control branch 102), and when the first level signal is a low level signal, the isolation circuit is a diode.

As shown in fig. 5, in the first key lamp control branch 101, an anode of the first diode D1 is connected to the second end of the first key S1, and a cathode of the first diode D1 is connected to the first independent end (I/O1) of the controller 200 and the first end of the first LED lamp LED1, respectively; in the second key lamp control branch 102, an anode of the second diode D2 is connected to the second end of the second key S2, and a cathode of the second diode D2 is connected to the second independent end (I/O2) of the second key 200 and the first end of the second LED lamp LED2, respectively.

In some embodiments, referring again to fig. 5, the current limiting circuit includes a resistor, i.e., the first key control branch 101 includes a first resistor R1, and the second key control branch 102 includes a second resistor R2.

In the first key lamp control branch 101, a first end of a first resistor R1 is connected to a first independent end (I/O1) and a second end of a first key S1, respectively, and a second end of a first resistor R1 is connected to a first end of a first LED lamp LED 1; in the second key lamp control branch 102, a first end of the second resistor R2 is connected to the second independent end (I/O2) and a second end of the second key S2, respectively, and a second end of the second resistor R2 is connected to a first end of the second LED lamp LED 2.

The operating principle of the key lighting circuit 10 shown in fig. 5 is as follows:

when the key lamp control circuit 10 starts to work, the controller 200 sets the first independent end (I/O1) and the second independent end (I/O2) to low level and sets the common end (COM) to high level, and in this state, the first LED lamp LED1 and the second LED lamp LED2 are not turned on; the controller 200 reads the states of the first independent terminal (I/O1) and the second independent terminal (I/O2) in real time, when the first independent terminal (I/O1)/the second independent terminal (I/O2) changes to high level, it indicates that the first key S1/the second key S2 is triggered, the controller 200 sets the first independent terminal (I/O1)/the second independent terminal (I/O2) to high level signal for a preset time (e.g. 5ms) and sets the common terminal (COM) to low level signal for the preset time, and at this time, the first LED lamp LED 1/the second LED lamp LED2 lights up within the preset time.

After the preset time is reached, the controller 200 sets the first independent terminal (I/O1)/the second independent terminal (I/O2) to be a low level signal and the common terminal (COM) to be a high level signal, at this time, the first LED lamp LED 1/the second LED lamp LED2 are turned off, and the controller 200 continues to read the level states of the first independent terminal (I/O1) and the second independent terminal (I/O2) in real time.

In this embodiment, since the isolation circuit (diode) is added in the key lamp control branch, when the LED lamp is on (i.e. when the COM port of the controller 200 is a low level signal and the I/O port of the controller 200 is a high level signal), if the key is triggered, the level signal of the common port of the controller 200 is isolated, so that the level state of the independent port is not affected, and the operating state of the LED lamp is not affected. Specifically, when the key is triggered, since the cathode of the diode is in a high level state and the anode thereof is in a low level state, the diode is turned off, and even if the key is triggered, the COM port of the controller 200 and the I/O port thereof are not physically conducted, so that the level signal of the COM port of the controller 200 does not affect the level signal state of the I/O port thereof, that is, the level signal of the I/O port of the controller 200 is not changed from the high level state to the low level state due to the triggering of the key, thereby causing the abnormal extinction of the LED lamp.

And because the current-limiting circuit (resistor) is added in the key lamp control branch, the LED lamp is ensured not to be burnt out due to the large current, and the reliability of the key lamp control circuit is improved.

In some embodiments, the controller 200 is a single chip. The single chip microcomputer has the characteristics of powerful function, low price, high integration level, small volume, good reliability, low power consumption and the like.

In a second aspect, referring to fig. 6, fig. 6 shows a key light control device, where the light control device 20 includes a key light module 400 and a control module 500, the key light module 400 includes a first socket J1 and a key light control circuit, and the control module 500 includes a second socket J2 and a controller.

The key lamp control circuit is connected with the input end of a first row of plug J1, the output end of the first row of plug J1 is connected with the input end of a second row of plug J2, and the output end J2 of the second row of plug is connected with the controller.

It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention and to provide a more thorough understanding of the present disclosure. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.

Claims (7)

1. A key lamp control circuit is characterized by comprising at least two key lamp control branches and a controller, wherein each key lamp control branch comprises a key and an LED lamp, the controller comprises a public end and at least two independent ends, and the public end and the independent ends are input/output ports of the controller;

in each key lamp control branch, a first end of the LED lamp is respectively connected with an independent end of the controller and a second end of the key, and a second end of the LED lamp is respectively connected with the first end of the key and a public end of the controller;

the controller is used for outputting a first level signal at the independent end and a second level signal at the public end when the key lamp control circuit starts to work so as to enable the key lamp control circuit to be in a preparation state, wherein the first level signal is opposite to the second level signal, and the controller can obtain the level signal of the independent end when and only when the key lamp control circuit is in the preparation state;

the key is used for conducting the independent end and the public end when being triggered so that the independent end receives a level signal of the public end;

the LED lamp is used for being lightened when a first end of the LED lamp is a first level signal and a second end of the LED lamp is a second level signal;

the controller is further configured to obtain a signal of the independent end in real time in the preparation state, set the first independent end as the second level signal and maintain a preset time when a first independent end exists in each independent end, set the common end as the first level signal and maintain the preset time, set the first independent end as the first level signal and set the common end as the second level signal when the preset time is reached, and set the common end as the first level signal and set the common end as the second level signal and continue to obtain the signal of the independent end in real time.

2. The key lamp control circuit according to claim 1, wherein the key lamp control branch further comprises an isolation circuit;

the first end of the isolation circuit is connected with the second end of the key, and the second end of the isolation circuit is respectively connected with the first end of the LED lamp and the independent end connected with the first end of the LED lamp;

the isolation circuit is used for preventing the level signals of the independent terminal and the common terminal from interfering with each other.

3. The key light control circuit of claim 1, wherein the key light control branch further comprises a current limiting circuit;

the first end of the current limiting circuit is connected with the independent end connected with the key lamp control branch circuit and the second end of the key respectively, and the second end of the current limiting circuit is connected with the first end of the LED lamp;

the current limiting circuit is used for limiting current.

4. The key lamp control circuit according to claim 2, wherein when the first level signal is a low level signal, the isolation circuit is a diode;

the anode of the diode is connected with the second end of the key, and the cathode of the diode is respectively connected with the first end of the LED lamp and the independent end connected with the first end of the LED lamp.

5. The key press lighting circuit of claim 3, wherein said current limiting circuit comprises a resistor;

the first end of the resistor is connected with the independent end connected with the LED lamp and the second end of the key respectively, and the second end of the resistor is connected with the first end of the LED lamp.

6. The key lamp control circuit of claim 1, wherein the controller is a single chip microcomputer.

7. A key light control device, comprising a key light module and a control module, wherein the key light module comprises a first socket and a key light control circuit according to any one of claims 1 to 6, and the control module comprises a second socket and a controller according to any one of claims 1 to 6;

the key lamp control circuit is connected with the input end of the first extension socket, the output end of the first extension socket is connected with the input end of the second extension socket, and the output end of the second extension socket is connected with the controller.

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