CN220067729U

CN220067729U - Flashlight lamp switch control circuit and corresponding handheld device

Info

Publication number: CN220067729U
Application number: CN202320140061.2U
Authority: CN
Inventors: 陈敏; 后建京
Original assignee: Wuxi Yuning Intelligent Technology Co ltd
Current assignee: Wuxi Yuning Intelligent Technology Co ltd
Priority date: 2023-02-01
Filing date: 2023-02-01
Publication date: 2023-11-21
Anticipated expiration: 2033-02-01

Abstract

The utility model provides a flashlight lamp switch control circuit and corresponding handheld equipment. The terminal control button is used for sending out the button signal, and the LED drive module is used for receiving button signal and switch-on signal to when the switch-on signal is the shut-off signal, LED drive module can be based on button signal output LED drive signal. The LED switch module is used for receiving the LED driving signal, and the LED switch module can control the flashlight lamp according to the LED driving signal. The software driving module is used for receiving the key signal and the on-off signal, and can output a key function signal based on the key signal when the on-off signal is a starting signal.

Description

Flashlight lamp switch control circuit and corresponding handheld device

Technical Field

The utility model relates to the field of circuits, in particular to a flashlight lamp switch control circuit and corresponding handheld equipment.

Background

In the prior art, the hand-held device is not provided with a special flashlight light switch key. Thus, existing handheld devices only support the on state to turn on the flashlight, and the handheld devices do not support the off state to turn on the flashlight. Therefore, when the handset is in a powered off state, the user cannot use the flashlight of the handheld device. Thus, there is a technical problem in that it is inconvenient for a user to use the existing handheld device.

Therefore, a flashlight switch control circuit and a corresponding handheld device are needed to solve the above-mentioned problems.

Disclosure of Invention

The utility model provides a flashlight lamp switch control circuit and corresponding handheld equipment, which effectively solve the technical problem that users are inconvenient to use the existing handheld equipment.

The utility model provides a flashlight lamp switch control circuit, which comprises:

the terminal control button is used for sending out a button signal;

the LED driving module is used for receiving the key signals and the on-off signals and outputting LED driving signals based on the key signals when the on-off signals are off signals;

the filtering module is used for carrying out filtering operation on the LED driving signals;

the LED switch module is used for receiving the LED driving signal and controlling a flashlight lamp according to the LED driving signal;

the software driving module is used for receiving the key signals and the on-off signals, outputting key function signals based on the key signals when the on-off signals are on signals, and is used for solving the function of turning on the flashlight lamp in the off state, structurally reducing a special key bit for controlling the flashlight lamp to be turned on or off in the off state, multiplexing any appointed key to realize, and simplifying structural design. In addition, the key operation in the starting state and the control flow of the flashlight are consistent with the flow which does not support the shutdown control of the flashlight, and software does not need to be adjusted.

In the flashlight lamp switch control circuit, when the on-off signal is a start-up signal, the LED driving module stops receiving the key signal; and when the on-off signal is a shutdown signal, the software driving module stops receiving the key signal.

In the flashlight lamp switch control circuit, the LED driving module comprises an LED driving chip, a first MOS tube and a second MOS tube, wherein the LED driving chip comprises an input pin, an output pin and an enabling pin, a grid electrode of the first MOS tube is used for receiving the switching-on and switching-off signal, a drain electrode of the first MOS tube is connected with a power supply, a source electrode of the first MOS tube is grounded, a grid electrode of the second MOS tube is used for receiving the key signal, a drain electrode of the second MOS tube is connected with the drain electrode of the first MOS tube and the enabling pin, a source electrode of the second MOS tube is grounded, the input pin is connected with the power supply, and the output pin is used for outputting the LED driving signal;

when the on-off signal is an off signal, the first MOS tube is in an off state, so that the drain electrode of the second MOS tube is controllable, and the LED driving module outputs the LED driving signal based on the key signal; when the on-off signal is a start-up signal, the first MOS tube is in a conducting state, so that the drain electrode of the second MOS tube is very low and uncontrollable, and the LED driving module stops receiving the key signal.

In the flashlight lamp switch control circuit, the software driving module further comprises a software driving chip, wherein the software driving chip comprises a signal output pin and a driving pin, the signal output pin is used for outputting the switch-on and switch-off signal, the driving pin is connected with the LED switch module, and the driving pin is used for outputting the driving signal; when the on-off signal is a starting signal, the driving pin outputs a driving signal, and the LED switch module controls the flashlight lamp based on the driving signal.

In the flashlight lamp switch control circuit, the LED switch module comprises a flashlight lamp and a first triode, one end of the flashlight lamp is connected with a power supply, the other end of the flashlight lamp is connected with a collector electrode of the first triode, a base electrode of the first triode is connected with the output pin, and an emitting electrode of the first triode is grounded.

In the flashlight lamp switch control circuit of the present utility model, the LED driving module further includes a first resistor group, the first resistor group is connected between the base of the first triode and the output pin, and the first resistor group is used for performing voltage division and current limiting operations on the first driving signal.

In the flashlight lamp switch control circuit of the utility model, the LED switch module comprises a flashlight lamp and a second triode, one end of the flashlight lamp is connected with a power supply, the other end of the flashlight lamp is connected with a collector electrode of the second triode, a base electrode of the second triode is connected with the driving pin, and an emitting electrode of the second triode is grounded.

In the flashlight lamp switch control circuit of the present utility model, the software driving module further includes a second resistor group, the second resistor group is connected between the base of the second triode and the driving pin, and the second resistor group is used for performing voltage dividing and current limiting operations on the second driving signal.

In the flashlight lamp switch control circuit, the LED driving module further comprises a filter capacitor, one end of the filter capacitor is connected with the input pin, the other end of the filter capacitor is grounded, and the filter capacitor is used for conducting filtering operation on voltage input by a power supply.

A hand-held device comprising a flashlight lamp switch control circuit as claimed in any one of the preceding claims.

Compared with the prior art, the utility model has the beneficial effects that: the utility model provides a flashlight lamp switch control circuit which comprises a terminal control key, an LED lamp driving module, an LED lamp switch module and a software driving module. The terminal control button is used for sending a button signal, and the LED driving module is used for receiving the button signal and the on-off signal. And when the on-off signal is an off signal, the LED driving module can output an LED driving signal based on the key signal. The LED switch module is used for receiving the LED driving signal, and the LED switch module can control the flashlight lamp according to the LED driving signal. Therefore, when the device is in a shutdown state, a user can also control the flashlight to be turned on or off through the terminal control key. The technical problem that a user cannot use the flashlight lamp of the handheld device when the mobile phone is in the off state is effectively solved, so that the user can use the device more conveniently.

The software driving module is used for receiving the key signal and the on-off signal, and outputting a key function signal based on the key signal when the on-off signal is a starting signal. In the off state, the terminal control key can control the on and off of the flashlight lamp. However, in the on state, the terminal control button is no longer binding the switch flashlight function. The terminal control key is used as a common key only, and can execute other functions. The device can reduce the key positions for switching on and off the flashlight in a power-off state on the mechanical structure of the device. The device can multiplex any appointed key to realize the function of switching on and off the flashlight lamp in the off state, and the structural design of the device is effectively simplified.

Drawings

FIG. 1 is a block diagram of one embodiment of a flashlight switch control circuit according to the present utility model.

Fig. 2 is a circuit diagram of an embodiment of a flashlight switch control circuit according to the present utility model.

In the figure, 10, a flashlight switch control circuit; 11. an LED driving module; 111. a first resistor group; 12. an LED switch module; 13. a software driving module; 131. a second resistor group; 14. a power supply; 15. and a power on/off signal input module.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms of directions used in the present utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are used for explaining and understanding the present utility model only with reference to the orientation of the drawings, and are not intended to limit the present utility model.

The words "first," "second," and the like in the terminology of the present utility model are used for descriptive purposes only and are not to be construed as indicating or implying relative importance and not as limiting the order of precedence.

In the drawings, like structural elements are denoted by like reference numerals.

Referring to fig. 1 and 2, the present utility model provides a flashlight switch control circuit 10. The flashlight switch control circuit 10 is applied to a handheld device, and the flashlight switch control circuit 10 comprises a terminal control key S501, an LED driving module 11, an LED switching module 12, a software driving module 13 and an on-off signal input module 15. The on-off signal input module 15 is configured to input an on-off signal, and when the handheld device is in an on-state, the on-off signal input module 15 inputs a high-level on-off signal. When the handheld device is in a shutdown state, the on-off signal input module 15 inputs a low-level shutdown signal. The terminal control button S501 is configured to send a button signal, and the LED driving module 11 is configured to receive the button signal and the on-off signal. And outputting an LED driving signal based on the key signal when the on-off signal is an off signal. The LED switch module 12 is configured to receive the LED driving signal, and the LED switch module 12 controls the flashlight according to the LED driving signal. The software driving module 13 is configured to receive the key signal and the on-off signal, and when the on-off signal is a power-on signal, the software driving module 13 outputs a key function signal based on the key signal. Moreover, when the on-off signal is the on-signal, the LED driving module 11 stops receiving the key signal. When the on-off signal is the off signal, the software driving module 13 stops receiving the key signal.

Referring to fig. 1 and 2, in the off state, the terminal control button S501 can control the flashlight to be turned on and off. However, in the on state, the terminal control button S501 is no longer binding the switch flashlight function. The terminal control key S501 is used as a normal key only, the terminal control key S501 can execute other functions, and the functions of the terminal control key S501 can be defined by software at will. Because the terminal control key S501 unbinds the logical association between the key function and the flashlight function in the on state, the user uses the terminal control key S501 more flexibly. The device can reduce the key positions for switching on and off the flashlight in a power-off state on the mechanical structure of the device. The device can multiplex any appointed key to realize the function of switching on and off the flashlight lamp in the off state, and the structural design of the device is effectively simplified. Moreover, the operation of the on-state terminal control button S501 and the control flow of the flashlight are consistent with the flow which does not support the shutdown control of the flashlight, so that the software does not need to be adjusted. The flashlight switch control circuit 10 has a simpler circuit structure, and the devices required by the circuit are more conventional, so that the circuit is low in implementation cost.

Referring to fig. 1 and 2, the LED driving module 11 includes an LED driving chip U607, a first MOS transistor Q602 and a second MOS transistor Q603, where the first MOS transistor Q602 and the second MOS transistor Q603 are both NMOS transistors. The LED driving chip U607 includes an input pin IN, an output pin OUT, and an enable pin EN, and the gate of the first MOS transistor Q604 is configured to receive a switch signal. The drain electrode of the first MOS tube Q602 is connected with the power supply 14, and the source electrode of the first MOS tube Q602 is grounded. The gate of the second MOS transistor Q603 is configured to receive the key signal, the drain of the second MOS transistor Q603 is connected to the drain of the first MOS transistor Q602 and the enable pin EN, and the source of the second MOS transistor Q603 is grounded. The input pin IN is connected to the power supply 14, and the output pin OUT is used for outputting LED driving signals. When the on-off signal is an off signal, the first MOS transistor Q602 is in an off state. Accordingly, the drain electrode of the second MOS transistor Q603 is controllable, and the LED driving module 11 outputs an LED driving signal based on the key signal. When the on-off signal is the on-state signal, the first MOS transistor Q602 is in the on-state. Therefore, the drain electrode of the second MOS transistor Q603 is shorted to the ground and is not controllable, and the LED driving module 11 stops receiving the key signal.

Referring to fig. 1 and 2, the led driving module 11 further includes a filter capacitor C618. One end of the filter capacitor C618 is connected with the input pin IN, and the other end of the filter capacitor C618 is grounded. The capacitance of the filter capacitor C618 is 1 μf, and the filter capacitor C618 is used for performing a filtering operation on the voltage input by the power supply 14. The LED driving module 11 further includes a ninth resistor R626 and a tenth resistor R610, and the filtering module includes a first capacitor C619. One end of the first capacitor C619 is connected to the output pin OUT. The other end of the first capacitor C619 is grounded, the capacitance reactance of the first capacitor C619 is 1 mu F, and the first capacitor C619 is used for filtering the LED driving signal. One end of the ninth resistor R626 is connected to the enable pin EN, and the other end of the ninth resistor R626 is connected to the output pin OUT. One end of a tenth resistor R610 is connected with the drain electrode of the first MOS tube Q602, the other end of the tenth resistor R610 is connected with the input pin OUT, and the impedance of the tenth resistor R610 is 100KΩ.

Referring to fig. 1 and 2, the led driving module 11 further includes a first resistor set 111, where the first resistor set 111 is connected between the base of the first triode Q604 and the output pin OUT, and the first resistor set 111 is used for performing voltage division and current limiting on the first driving signal. The first resistor group 111 includes a first resistor R625 and a second resistor R634, where one end of the first resistor R625 is connected to the base of the first triode Q604, and the other end of the first resistor R625 is connected to the output pin OUT. One end of the second resistor R634 is connected to the base of the first triode Q604, and the other end of the second resistor R634 is grounded. The resistance of the first resistor R625 is 3.3kΩ, and the resistance of the second resistor R634 is 15kΩ.

Referring to fig. 1 and 2, the software driving module 13 further includes a software driving chip CPU, where the software driving chip CPU includes a signal output pin VDDIO and a driving pin GPIO. The signal output pin VDDIO is used for outputting a switching signal, the driving pin is connected with the LED switch module 12, and the driving pin GPIO is used for outputting a driving signal. When the on-off signal is an on-signal, the driving pin GPIO outputs a driving signal, and the LED switch module 12 controls the flashlight D601 to be turned on and off based on the driving signal. When the on-off signal is a shutdown signal, the software driving chip CPU is turned off, and the driving pin GPIO cannot output a driving signal. And, the software driver chip CPU also stops receiving the key signal.

Referring to fig. 1 and 2, the software driving module 13 further includes a second resistor group 131, the second resistor group 131 is connected between the base of the second triode Q601 and the driving pin GPIO, and the second resistor group 131 is used for performing voltage division and current limiting operations on the second driving signal. The second resistor group 131 includes a third resistor R603 and a fourth resistor R601, one end of the third resistor R603 is connected to the base of the second triode Q601, and the other end of the third resistor R603 is connected to the driving pin GPIO. One end of the fourth resistor R601 is connected with the base electrode of the second triode Q601, and the other end of the fourth resistor R601 is grounded. The resistance of the third resistor R603 is 3.3kΩ, and the resistance of the fourth resistor R601 is 15kΩ. The software driver module 13 further includes a diode D603, and the software driver chip CPU further includes a KEY signal input pin key_in. The anode of the diode D603 is connected to the KEY signal input pin key_in, the cathode of the diode D603 is connected to the base of the second MOS transistor Q603, and the diode D603 is used for performing level conversion on the KEY signal. The software driving module 13 further includes an eleventh resistor R617, and one end of the eleventh resistor R617 is connected to the receiving pin VDDIO. The other end of the eleventh resistor R617 is connected to the KEY signal input pin key_in, and the resistance value of the eleventh resistor R617 is 100kΩ.

Referring to fig. 1 and 2, the led switch module 12 includes a flashlight D601, a first transistor Q604, and a second transistor Q601. One end of a flashlight D601 is connected with a power supply 14, and the other end of the flashlight D601 is connected with a collector electrode of a first triode Q604 and a collector electrode of a second triode Q601. The base of the first transistor Q604 is connected to the output pin OUT, and the emitter of the first transistor Q604 is grounded. The base of the second triode Q601 is connected with a driving pin GPIO, and the emitter of the second triode Q601 is grounded. The LED switch module 12 further includes a fifth resistor R628, a sixth resistor R609, a seventh resistor R602, and an eighth resistor R627, where one end of the fifth resistor R628 is connected to the collector of the first triode Q604. The other end of the fifth resistor R628 is connected to the flashlight D601, and the sixth resistor R609 is connected in parallel with the fifth resistor R628. One end of the seventh resistor R602 is connected to the power supply 14, the other end of the seventh resistor R602 is connected to the flashlight D601, and the eighth resistor R627 is connected in parallel with the seventh resistor R602.

Referring to fig. 1 and 2, the flashlight switch control circuit 10 further includes a twelfth resistor R611. One end of the twelfth resistor R611 is connected to the on/off signal input module 15, the other end of the twelfth resistor R611 is connected to the gate of the first MOS transistor Q602, and the resistance of the twelfth resistor R611 is 100kΩ. The flashlight switch control circuit 10 further includes a thirteenth resistor R502 and a fourteenth resistor R612, and the terminal control button S501 includes a first end, a second end, a third end, and a fourth end, where the first end, the second end, and the fourth end are all grounded. One end of the thirteenth resistor R502 is connected to the third end of the terminal control button S501, and the other end of the thirteenth resistor R502 is connected to the fourteenth resistor R612. The fourteenth resistor R612 is connected to the gate of the second MOS transistor Q603, and the resistance of the thirteenth resistor R602 and the resistance of the fourteenth resistor R612 are both 1kΩ. The flashlight switch control circuit 10 further includes a second capacitor C615 and a voltage regulator TVBS01, wherein one end of the second capacitor C615 is connected to the thirteenth resistor R502, and the other end of the second capacitor C615 is grounded. One end of the voltage stabilizing tube TVS 01 is connected with a fourteenth resistor R612, and the other end of the voltage stabilizing tube TVS 01 is grounded. The flashlight switch control circuit 10 includes a fifteenth resistor R613, and one end of the fifteenth resistor R613 is connected to the power source 14. The other end of the fifteenth resistor R613 is connected to a fourteenth resistor R612, and the resistance value of the fifteenth resistor R613 is 100kΩ.

The working principle of the utility model is as follows: when the handheld device is in a shutdown state, the on-off signal input module 15 outputs a low-level shutdown signal. Thus, the first MOS transistor Q602 is in an off state. The gate of the second MOS transistor Q603 is pulled up to the power supply 14 by the fifteenth resistor R613, so that the second MOS transistor Q603 is in a conducting state, and a user can control the flashlight D601 to be turned on and off through the terminal key switch S501. When the user presses the terminal key switch S501, the terminal control key S501 emits a key signal, and the second MOS transistor Q603 is turned off based on the key signal. The drain electrode of the second MOS transistor Q603 is pulled up to the power supply 14 by the tenth resistor R610, so that the enable pin EN of the LED driving chip U607 can receive a high level signal. Therefore, the LED driving chip U607 is turned on. Further, the LED driving chip U607 outputs an LED driving signal, and the voltage of the LED driving signal is 1.8V. After the LED driving signal is divided and limited by the first resistor R625 and the second resistor R624, the LED driving signal may drive the first transistor Q604 to be turned on. Thus, the LED switch module 12 is turned on, and the flashlight D601 may be turned on. The transistor has a constant current characteristic and the current through flashlight D601 is continuously stable even if the voltage of power supply 14 changes.

When the handheld device is in a power-on state, the power-on/off signal input module 15 outputs a power-on signal of a high level. Thus, the first MOS transistor Q602 is turned on, and the drain of the first MOS transistor Q602 outputs a low-level signal. At this time, the LED driving chip U607 is in an off state regardless of whether the terminal key switch S501 is pressed. The first transistor Q604 is thus also turned off, and thus the terminal key switch S501 cannot control the flashlight to be turned on or off. But the key signal inputted by the terminal key switch S501 can be level-converted via the diode D603, and the key signal can be recognized by the software driving chip CPU. Therefore, the software driving chip CPU can recognize that the terminal key switch operates normally in the starting state, and the software driving chip CPU outputs a key function signal based on the key signal. Based on the key function signal, the terminal control key S501 may be used as a normal key only, and the terminal control key S501 may be used to perform other functions. Meanwhile, the switching operation of the flashlight is performed by a driving pin GPIO of a software driving chip CPU. The driving pin GPIO may output a high-level driving signal, and after the driving signal is divided and limited by the third resistor R603 and the fourth resistor R601, the driving signal may drive the second triode Q601 to be turned on. Thus, the LED switch module 12 is turned on, and the flashlight D601 may be turned on.

The utility model provides a flashlight lamp switch control circuit which comprises a terminal control key, an LED lamp driving module, an LED lamp switch module and a software driving module. The terminal control button is used for sending a button signal, and the LED driving module is used for receiving the button signal and the on-off signal. And when the on-off signal is an off signal, the LED driving module outputs an LED driving signal based on the key signal. The LED switch module is used for receiving the LED driving signal, and the LED switch module can control the flashlight lamp according to the LED driving signal. Therefore, when the device is in a shutdown state, a user can also control the flashlight to be turned on or off through the terminal control key. The technical problem that a user cannot use the flashlight lamp of the handheld device when the mobile phone is in the off state is effectively solved, so that the user can use the device more conveniently.

In summary, although the present utility model has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model is defined by the appended claims.

Claims

1. A flashlight light switch control circuit, comprising:

the terminal control button is used for sending out a button signal;

and the software driving module is used for receiving the key signal and the on-off signal and outputting a key function signal based on the key signal when the on-off signal is a starting signal.

2. The flashlight of claim 1, wherein the LED driver module stops receiving the key signal when the on/off signal is an on signal; and when the on-off signal is a shutdown signal, the software driving module stops receiving the key signal.

3. The flashlight lamp switch control circuit of claim 1, wherein the LED driving module comprises an LED driving chip, a first MOS tube and a second MOS tube, the LED driving chip comprises an input pin, an output pin and an enable pin, the grid electrode of the first MOS tube is used for receiving the switch-on/off signal, the drain electrode of the first MOS tube is connected with a power supply, the source electrode of the first MOS tube is grounded, the grid electrode of the second MOS tube is used for receiving the key signal, the drain electrode of the second MOS tube is connected with the drain electrode of the first MOS tube and the enable pin, the source electrode of the second MOS tube is grounded, the input pin is connected with the power supply, and the output pin is used for outputting the LED driving signal;

when the on-off signal is an off signal, the first MOS tube is in an off state, so that the second MOS tube is conducted, and the LED driving module outputs the LED driving signal based on the key signal; when the on-off signal is a start-up signal, the first MOS tube is in a conducting state, so that the drain electrode of the second MOS tube is short-circuited to the ground and does not act, and the LED driving module stops receiving the key signal.

4. The flashlight of claim 1, wherein the software driver module further comprises a software driver chip, the software driver chip comprises a signal output pin and a driver pin, the signal output pin is used for outputting the on-off signal, the driver pin is connected with the LED switch module, and the driver pin is used for outputting the driver signal; when the on-off signal is a starting signal, the driving pin outputs a driving signal, and the LED switch module controls the flashlight lamp based on the driving signal.

5. A flashlight switch control circuit as claimed in claim 3 wherein said LED switch module comprises a flashlight and a first triode, one end of said flashlight is connected to a power source, the other end of said flashlight is connected to a collector of said first triode, a base of said first triode is connected to said output pin, and an emitter of said first triode is grounded.

6. The flashlight of claim 5, wherein the LED driving module further comprises a first resistor group, the first resistor group is connected between the base of the first transistor and the output pin, and the first resistor group is used for performing voltage dividing and current limiting operations on the first driving signal.

7. The flashlight of claim 4, wherein the LED switch module comprises a flashlight and a second triode, wherein one end of the flashlight is connected to a power source, the other end of the flashlight is connected to a collector of the second triode, a base of the second triode is connected to the driving pin, and an emitter of the second triode is grounded.

8. The flashlight of claim 7, wherein the software driver module further comprises a second resistor set, the second resistor set is connected between the base of the second transistor and the driving pin, and the second resistor set is configured to perform a voltage dividing and current limiting operation on a second driving signal.

9. A flashlight lamp switch control circuit as claimed in claim 3 wherein said LED driver module further comprises a filter capacitor, one end of said filter capacitor is connected to said input pin, the other end of said filter capacitor is grounded, said filter capacitor is used for filtering the voltage input from said power source.

10. A hand-held device comprising a flashlight lamp switching control circuit as claimed in any one of claims 1 to 9.