CN218446501U - One-key startup and shutdown circuit applied to battery-powered electronic product - Google Patents

Abstract

The utility model provides a be applied to a key switching on and shutting down circuit of battery powered electronic product, include: the power on/off key circuit, the NOT gate circuit, the LDO circuit with the enable control, the NMOS tube and the central control chip MCU; the power-on and power-off key circuit is electrically connected with the NOT gate circuit, and the input end of the NOT gate circuit is electrically connected with the D pole of the NMOS tube; the output end of the NOT gate circuit is electrically connected with an enabling pin of the LDO circuit, and one output of the central control chip MCU can be matched with a GPIO pin to be electrically connected with the G electrode of the NMOS tube. The utility model discloses be applied to battery powered electronic product's a key switching on and shutting down circuit can make the electronic product start fast, easy operation is convenient, only need a key operation can, the button function is diversified, has realized the function operation variety of product, the overlength standby of shutting down, the circuit is simple, low cost, the reaction is rapid, has extensive practicality and suitability.

Description

One-key startup and shutdown circuit applied to battery-powered electronic product

Technical Field

The utility model relates to a key switching on and shutting down circuit technical field particularly, relates to a be applied to battery powered electronic product's key switching on and shutting down circuit.

Background

Electronic devices are now becoming more popular, most of which are portable, battery-powered electronic products. One-key on-off circuits have been widely used in many battery-powered products, such as smart phones, tablets, bluetooth speakers, etc. The one-key startup and shutdown circuit is simple to use, can be matched with other keys on a product to realize other functions together, and has wide practicability.

However, the current on-off functions on the market can only have two functions: the power-on and power-off functions are single, no other operation functions are used, and the requirements of users on more novel operation modes cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model discloses an aim at designs a key switching on and switching off circuit of being applied to battery powered electronic product, and the start is quick, simple and convenient, only need a key operation can for the button function is diversified, realizes the function operation variety of product.

The utility model provides a be applied to a key switching on and shutting down circuit of battery powered electronic product, include:

the power on/off key circuit, the NOT gate circuit, the LDO circuit with the enable control, the NMOS tube and the central control chip MCU;

the startup and shutdown key circuit is electrically connected with the NOT gate circuit, the input end of the NOT gate circuit is electrically connected with the D pole of the NMOS tube, the output end of the NOT gate circuit is electrically connected with the enable pin of the LDO circuit, and one output of the MCU can be matched with the GPIO pin to be electrically connected with the G pole of the NMOS tube.

Further, the power on/off button circuit includes: the non-lockable resilient button is pressed.

Further, the not gate circuit comprises a logic device with the level of the single-ended input signal and the level of the single-ended output signal being opposite.

Further, the LDO circuit includes: and the low dropout linear regulator is used for generating a suitable power supply voltage of the MCU.

Furthermore, the NMOS tube is a switch tube and is used for switching control, and when the one-key switching circuit system normally operates, the one-key switching circuit system is kept in an open state.

Further, the power on/off button circuit further includes: and the transient voltage suppression diode TVS tube is connected with the key in series and used for preventing ESD electrostatic interference and surge protection.

Furthermore, when the electronic product is in a power-on state, the power-on and power-off key circuit is electrically connected with the detection pin of the central control chip MCU, and is used for detecting which state of long pressing, short pressing and continuous pressing of the key, realizing different functions, and matching with other keys of the product to use together, and realizing a combined function effect.

Furthermore, the central control chip MCU is a main control chip of the electronic product system, and controls each function of the whole electronic product system to be normally implemented.

The utility model discloses a press the button for a period, the on-off keying circuit produces a low level signal, become the enable pin that high level signal gave the LDO circuit through non-gate circuit inverting, enable the work with the LDO circuit, produce the required voltage of central control chip MCU work, wait for on-line initialization normal operating back on the central control chip MCU, with the GPIO pin output high level signal that the G utmost point of NMOS pipe is connected, the D-S utmost point of NMOS pipe switches on ground signal, the input that makes non-gate circuit is low level state, the state that simulation start switch pressed, at this moment can loosen the button realizes start function.

The utility model discloses a key switching on and shutting down circuit realizes the process as follows in battery powered electronic product's application:

a signal of a power-on and power-off button in a normal state is pulled up to the voltage of an electronic product system through a 100k resistor to keep a high level signal, when the button is pressed down, the signal is pulled to the ground to change into a low level signal, and a TVS (transient voltage suppressor) is added to the button to prevent ESD (electro static discharge) electrostatic interference and surge protection;

a starting process: a low level signal generated by pressing a startup and shutdown key is input to a not-gate circuit, the not-gate circuit (2) reversely outputs a high level signal to the LDO circuit, the level of an enabling pin of the LDO circuit becomes high to work, and voltage suitable for the work of a central control chip MCU is output to supply power, the central control chip MCU is initialized to normally operate after being supplied with power, the level of a GPIO pin connected to a G pole of an NMOS tube is always kept in a high level output state, a D-S pole of the NMOS tube is conducted, the input of the not-gate circuit is continuously pulled down to simulate the state of pressing the startup key, and then the key can be released (the key can be released when the screen of an electronic product is bright or a startup prompt sound is generated), so that the startup function is realized;

and (3) shutdown process: manually pressing a power-on and power-off key for a period of time, generating a continuous low level signal, inputting the continuous low level signal to a central control chip MCU through a GPIO pin of the central control chip MCU, configuring the time for detecting the pull-down signal level of the key by a detection pin, namely the power-off time, changing the GPIO pin connected to the G pole of an NMOS (N-channel metal oxide semiconductor) tube into a low level by the central control chip MCU, switching off the D-S pole of the NMOS, generating a power-off interface or a power-off sound prompt by an electronic product system, and then releasing the key to realize the power-off function;

the electronic product is in a starting state, the startup and shutdown key can also detect a pin through a GPIO (general purpose input/output) connected to the MCU (micro control unit), and the startup and shutdown key can be used for detecting which state of long pressing, short pressing and continuous pressing through the MCU software configuration, so that different functions are realized, and the startup and shutdown key can be used together with other keys of the product to realize other novel combined function effects.

The circuit of the utility model is simple, and only comprises a plurality of discrete components and a voltage conversion IC (integrated voltage stabilization chip), so that the cost is low; the circuit has quick response, and the power supply voltage required by the system can be generated within nanosecond-level time after the key is pressed down; the state of the key can be detected, and different states such as long press, short press, continuous press and the like can be reflected to the system control chip to complete different functional operations.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses be applied to battery powered electronic product's a key switch circuit can make the electronic product start quick, easy operation convenient, only need a key operation can, the button function is diversified, has realized the functional operation variety of product, shuts down overlength standby, and the circuit is simple, low cost, and the reaction is rapid, has extensive practicality and suitability.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.

In the drawings:

fig. 1 is a schematic circuit diagram of a one-key power on/off circuit applied to a battery-powered electronic product according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a circuit connection of a one-key switch circuit applied to a battery-powered electronic product according to an embodiment of the present invention.

Labeled in the figures of the drawings:

(1) a startup and shutdown keying circuit, (2) a NOT gate circuit, (3) an LDO circuit, (4) an NMOS tube, and (5) a central control chip MCU.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and products consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if," as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination," depending on the context.

The embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the utility model provides a be applied to a key switching on and shutting down circuit of battery powered electronic product, it is shown with reference to fig. 1, 2, include:

the power on/off control circuit comprises a power on/off key circuit (1), a NOT gate circuit (2), an LDO circuit (3) with enable control, an NMOS (N-channel metal oxide semiconductor) tube (4) and a central control chip MCU (5);

in this embodiment, the power on/off key circuit (1) includes: pressing the unlocked resilient key;

the NOT gate circuit (2) comprises a logic device with the level of a single-ended input signal and the level of a single-ended output signal being inverted;

the NMOS tube (4) is a switching tube and is used for switching control of the LDO, and when the one-key switching circuit system normally operates, the one-key switching circuit system is kept in a straight-on state;

the LDO circuit (3) comprises: the low dropout linear regulator is used for generating a power supply voltage of the central control chip MCU (5);

the central control chip MCU (5) is a main control chip of the electronic product system and controls the normal implementation of all functions of the whole electronic product system;

the power on/off key circuit (1) is electrically connected with the input end of the NOT gate circuit (2), the input end of the NOT gate circuit (2) is electrically connected with the D pole of the NMOS tube (4), and the output end of the NOT gate circuit (2) is electrically connected with an enabling pin of the LDO circuit (3); one output of the central control chip MCU (5) can be matched with a GPIO pin to be electrically connected with a G pole pin of the NMOS tube (4).

The power on/off key circuit (1) further comprises: transient voltage suppression diode TVS pipe, transient voltage suppression diode TVS pipe with button parallel connection for prevent ESD electrostatic interference and surge protection.

When the electronic product is in a starting state, the startup and shutdown key circuit (1) is electrically connected with the detection pin of the central control chip MCU (5) and is used for detecting whether the key is in a long-press state, a short-press state or a continuous-press state, so that different functions are realized, and the electronic product is matched with other keys of the product to be used together, and a combined function effect is realized.

The embodiment of the utility model provides a through pressing the button down a period of time, switch on/off keying circuit (1) produces a low level signal, become the enable pin of high level signal for LDO circuit (3) through NOT gate circuit (2) antiphase, enable work with LDO circuit (3), produce central control chip MCU (5) required voltage of work, wait for central control chip MCU (5) to go up the electricity initialization normal operating after, GPIO pin output a high level signal that links to each other with the G utmost point of NMOS pipe (4), make the D-S utmost point of NMOS pipe (4) switch on ground, make the input of NOT gate circuit (2) be the low level state, the state that simulation start switch pressed, loosen the button realizes the start function.

The embodiment of the utility model provides a key switching on and switching off circuit realizes the process as follows in battery powered electronic product's application:

a signal of a power-on and power-off button in a normal state is pulled up to the voltage of an electronic product system through a 100k resistor to keep a high level signal, when the button is pressed down, the signal is pulled to the ground to be changed into a low level signal, and a TVS (transient voltage suppressor) is added to the button to prevent ESD (electro static discharge) electrostatic interference and surge protection;

the starting process comprises the following steps: a low level signal generated by pressing a startup and shutdown key is input to a NOT gate circuit (2), the NOT gate circuit (2) outputs a high level to an LDO circuit (3), the level of an enable pin of the LDO circuit (3) is changed to work, and voltage suitable for working of a central control chip MCU (5) is output for power supply, after the central control chip MCU (5) is powered on, the central control chip MCU (5) is initialized to normally operate, the level of a GPIO pin connected to a G pole of an NMOS (N-channel metal oxide semiconductor) tube (4) is always kept in a high level output state, a D-S pole of the NMOS tube (4) is conducted, the input of the NOT gate circuit (2) is continuously pulled down, the state of pressing the startup key is simulated, the key can be released at this time (the key can be released when a screen of an electronic product is generally bright or a startup prompt sound is generated), and the startup function is realized;

shutdown process: manually pressing a power-on and power-off key for a period of time, generating a continuous low level signal, inputting the continuous low level signal to a central control chip MCU (5) through a GPIO pin of the central control chip MCU (5), configuring the time for detecting the pull-down signal level of the key by a detection pin, namely the power-off time by the central control chip MCU (5), changing the GPIO pin connected to the G pole of an NMOS (N-channel metal oxide semiconductor) tube (4) into low level by the central control chip MCU (5), enabling an electronic product system to generate a power-off interface or a power-off sound prompt after the NMOS tube is turned off, and then loosening the key to realize the power-off function;

when the electronic product is in a starting state, the startup and shutdown key can be used for detecting which state of long pressing, short pressing and continuous pressing is the startup and shutdown key through a detection pin connected to the central control chip MCU (5), so that different functions are realized, and the startup and shutdown key can be used together with other keys of the product to realize other novel combined functional effects.

In practical application, the starting process: the startup and shutdown key is manually pressed down for a certain time, and the key can be released when the screen of the electronic product is bright or a startup prompt sound is generated, so that the startup function is realized. And (3) shutdown process: the operation is the same as the starting process, the startup and shutdown key is manually pressed for a period of time, the electronic product system generates a shutdown interface or a shutdown sound prompt, and then the key is released to realize the shutdown function.

The circuit of the utility model is simple, and only comprises a plurality of discrete components and a voltage conversion IC (integrated voltage stabilization chip), so that the cost is low; the circuit has quick response, and the power supply voltage required by the system can be generated within nanosecond-level time after the key is pressed down; the state of the key can be detected, and different states such as long press, short press, continuous press and the like are reflected to the system control chip to complete different functional operations.

The embodiment of the utility model provides a be applied to battery powered electronic product's a key switch circuit can make the electronic product start quick, easy operation convenient, only need a key operation can, the button function is diversified, has realized the functional operation variety of product, shuts down overlength standby, and the circuit is simple, low cost, and the reaction is rapid, has extensive practicality and suitability.

Application example

The following describes a specific working principle of the present invention with a specific application example.

The utility model discloses a key switching on and shutting down circuit uses and realizes different functions as follows in MP 4:

a starting function:

under the condition that the power supply of the MP4 battery is enough, after a power-on and power-off button is pressed for 3 seconds, a power-on LOGO picture appears on the MP4 screen and a power-on prompting sound is emitted, at the moment, the button is released, and after the MP4 works normally, all functional operations of the MP4 can be carried out.

Shutdown function:

when a user does not need to use the MP4 to save power during shutdown, after a startup and shutdown key is pressed for 3 seconds, a shutdown LOGO picture appears on the MP4 screen and a shutdown prompt sound is emitted, at the moment, the key is released, and after the MP4 automatically disconnects all power supplies of a system, the MP4 is completely shutdown.

Other novel functions:

under the condition that the MP4 is started, a power on/off key is pressed for a second, so that the MP4 screen power supply is turned off or turned on for standby power saving; the flashlight function of quickly turning on the MP4 is realized by continuously pressing the power on-off key; the power-on and power-off key and the volume plus key are pressed simultaneously, so that the function of quickly switching the next song is realized; the power-on and power-off key and the volume reduction key are pressed simultaneously, so that the function of quickly switching the previous song is realized; and other keys and the startup and shutdown key are combined together to realize different shortcuts for use.

So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions can be made on the related technical features by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions will fall into the protection scope of the invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A one-key switch circuit for use in a battery-powered electronic product, comprising:

the power on/off key circuit, the NOT gate circuit, the LDO circuit with the enable control, the NMOS tube and the central control chip MCU;

the startup and shutdown key circuit is electrically connected with the NOT gate circuit, the input end of the NOT gate circuit is electrically connected with the D pole of the NMOS tube, the output end of the NOT gate circuit is electrically connected with the enable pin of the LDO circuit, and one output of the MCU can be matched with the GPIO pin to be electrically connected with the G pole pin of the NMOS tube.

2. A one-key switch circuit applied to a battery-powered electronic product according to claim 1, wherein the switch key circuit comprises: the non-lockable resilient button is pressed.

3. A key switch circuit for a battery operated electronic product as claimed in claim 1 wherein said not gate circuit comprises logic devices having inverted levels of single ended input signals and single ended output signals.

4. The one-key switch circuit applied to the battery-powered electronic product according to claim 1, wherein the LDO circuit comprises: and the low dropout linear regulator is used for generating a power supply voltage of the MCU.

5. The one-key switch circuit applied to the battery-powered electronic product as claimed in claim 1, wherein the NMOS transistor is a switch transistor for controlling the switch to maintain an on-state after the one-key switch circuit system is normally operated.

6. The one-key power on/off circuit applied to a battery-powered electronic product of claim 2, wherein the power on/off key circuit further comprises: transient voltage suppression diode TVS pipe, transient voltage suppression diode TVS pipe with button parallel connection for prevent ESD electrostatic interference and surge protection.

7. The one-key switch circuit applied to the battery-powered electronic product as claimed in claim 1, wherein when the electronic product is in a power-on state, the switch key circuit is electrically connected to the detection pin of the MCU, and is configured to detect whether the key is pressed for a long time, a short time, or continuously, so as to implement different functions, and to cooperate with other keys of the product to implement a combined functional effect.

8. The one-key switch-on/off circuit applied to the battery-powered electronic product as claimed in claim 1, wherein the central control chip MCU is a main control chip of the electronic product system for controlling the normal implementation of all functions of the whole electronic product system.

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