CN217590368U - One-key multifunctional application circuit - Google Patents

Abstract

The utility model discloses a one-key multifunctional application circuit, which comprises a key circuit, a power input control circuit and a power supply circuit, wherein the key circuit is used for generating a key control signal; the power input control circuit is respectively connected with the first power supply and the key control circuit so as to control and output the first power supply under the action of the key control signal; the power supply circuit is connected with the power input control circuit to convert the first power supply into a second power supply, and the second power supply maintains the conduction of the power input control circuit to maintain the output of the first power supply. Therefore, the power supply output control of the system power supply of the electronic equipment can be realized through one control key, and the use of a manual switch is reduced. In addition, the load control circuit, the voltage detection switch circuit, the USB power supply circuit and the program burning control circuit are matched. The multifunctional application control of one key can be realized, and the use of control keys is greatly reduced.

Description

One-key multifunctional application circuit

Technical Field

The utility model relates to a mains operated control technical field especially relates to a multi-functional application circuit of a key.

Background

The functions of smart home products are numerous and the corresponding keys are increased, and due to the requirements for product appearance beautification, appearance size control, strict requirements for outdoor application waterproof grade, material cost saving, circuit simplification and the like, the use of the control keys is generally required to be reduced as much as possible to meet the design requirements, and especially in the aspect of power supply of the smart home products, the use of a manual switch is required to be reduced as much as possible.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the present invention is to provide a one-key multifunctional application circuit.

In order to achieve the above object, an embodiment of the present invention provides a one-key multifunctional application circuit, including:

a key circuit for generating a key control signal;

the power input control circuit is respectively connected with a first power supply and the key control circuit so as to control and output the first power supply under the action of the key control signal;

and the power supply circuit is connected with the power input control circuit so as to convert the first power supply into a second power supply, and the conduction of the power input control circuit is maintained through the second power supply so as to maintain the output of the first power supply.

Further, according to an embodiment of the present invention, the one-key multi-function application circuit further includes:

and the load control circuit is connected with the power input control circuit so as to control and output the first power supply output by the power input control circuit.

Further, according to an embodiment of the present invention, the one-key multifunctional application circuit further comprises:

and the voltage detection switch circuit is respectively connected with the key circuit and the power input control circuit so as to carry out output control on the first power supply through the power input control circuit under the action of the key control signal.

Further, according to an embodiment of the present invention, the one-key multi-function application circuit further includes:

the USB power supply circuit is respectively connected with the key circuit, the power input control circuit and the load control circuit so as to supply power to the key circuit, the power input control circuit and the load control circuit in a USB power supply mode;

and the program burning control circuit is connected with the key circuit and outputs a burning control signal under the action of the key control signal.

Further, according to the utility model discloses an embodiment, the keying circuit includes:

one end of the control key S1 is connected with a first power supply through a diode D10;

one end of the resistor R41 is connected with the other end of the control key S1, and the other end of the resistor R41 is connected with a reference ground;

one end of the resistor R40 is connected with the one end of the resistor R41, and the other end of the resistor R40 is connected with the power input control circuit to output the key control signal.

Further, according to an embodiment of the present invention, the power input control circuit includes:

the source electrode of the MOS tube Q3 is connected with the first power supply, the source electrode of the MOS tube Q3 is also connected with the grid electrode of the MOS tube Q3 through a resistor R13, and the drain electrode of the MOS tube Q3 is connected with the power supply circuit to control and output the first power supply;

MOS pipe Q6, MOS pipe Q6's drain electrode with MOS pipe Q3's grid is connected, MOS pipe Q6's grid pass through resistance R22 with key control signal's output is connected, MOS pipe Q6's grid still pass through resistance R23 with MOS pipe Q6's source electrode is connected, MOS pipe Q6's source electrode is connected with reference ground.

Further, according to an embodiment of the present invention, the power supply circuit includes:

a power supply input end of the voltage converter U5 is connected with a drain electrode of the MOS transistor Q3, and a power supply output end of the voltage converter U5 is connected with a grid electrode of the MOS transistor Q6 through an inductor L2;

the power input control circuit further comprises an MOS transistor Q7, a drain electrode of the MOS transistor Q7 is connected with a grid electrode of the MOS transistor Q6, a source electrode of the MOS transistor Q7 is connected with a reference ground, and a grid electrode of the MOS transistor Q7 is connected with an output end of a control end signal of the controller through a resistor R26.

Further, according to an embodiment of the present invention, the load control circuit includes:

the source electrode of the MOS transistor Q4 is connected with the drain electrode of the MOS transistor Q3, the source electrode of the MOS transistor Q4 is also connected with the grid electrode of the MOS transistor Q4 through a resistor R14, and the drain electrode of the MOS transistor Q4 controls and outputs a system power supply output by the drain electrode of the MOS transistor Q3;

the drain electrode of the MOS transistor Q5 is connected with the gate electrode of the MOS transistor Q4, the gate electrode of the MOS transistor Q5 is connected with the output end of a control signal of the controller through a resistor R18, the gate electrode of the MOS transistor Q5 is also connected with the source electrode of the MOS transistor Q5 through a resistor R20, and the source electrode of the MOS transistor Q5 is also connected with a reference ground; and a voltage detection end of the controller is also connected with the key control signal so as to carry out cut-off control on the MOS tube Q5 according to the key control signal.

Further, according to an embodiment of the present invention, the source of the MOS transistor Q6 is connected to a reference ground through the voltage detection switch circuit; wherein the voltage detection switch circuit includes:

the power supply input detection end of the voltage monitoring integrated circuit is connected with the key control signal output end of the key circuit;

MOS pipe Q8, MOS pipe Q8's grid with voltage monitoring integrated circuit's detection signal output end is connected, MOS pipe Q8's source electrode with MOS pipe Q6's source electrode is connected, MOS pipe Q8's drain electrode is connected with reference ground.

Further, according to an embodiment of the present invention, the USB power supply circuit includes:

the source electrode of the MOS tube Q3 is connected with the first power supply through the MOS tube Q2; the source electrode of the MOS tube Q2 is connected with the source electrode of the MOS tube Q3, the drain electrode of the MOS tube Q2 is connected with the first power supply, the grid electrode of the MOS tube Q2 is connected with a reference ground through a resistor R16, and the grid electrode of the MOS tube Q2 is also connected with a USB power supply output end through a resistor R12;

the anode of the diode D11 is connected with the USB power supply output end, and the cathode of the diode D11 is connected with the one end of the control key S1;

the anode of the diode D2 is connected with the USB power supply output end, and the cathode of the diode D2 is connected with the drain of the MOS tube Q3;

and the anode of the diode D5 is connected with the USB power supply output end, and the cathode of the diode D5 is connected with the grid of the MOS tube Q5 through the resistor R18.

The embodiment of the utility model provides a multi-functional application circuit of a key is used for producing the button control signal through the keying circuit; the power input control circuit is respectively connected with a first power supply and the key control circuit so as to control and output the first power supply under the action of the key control signal; the power supply circuit is connected with the power input control circuit so as to convert the first power supply into a second power supply, and the second power supply maintains the conduction of the power input control circuit so as to maintain the output of the first power supply. Therefore, the power supply output control of the system power supply of the electronic equipment can be realized through one control key, and the use of a manual switch is reduced. In addition, the load control circuit, the voltage detection switch circuit, the USB power supply circuit and the program burning control circuit are matched. The multifunctional application control of one key can be realized, and the use of control keys is greatly reduced.

Drawings

Fig. 1 is a block diagram of a one-key multifunctional application circuit according to an embodiment of the present invention;

fig. 2 is a circuit structure diagram of a one-key multifunctional application circuit provided by the embodiment of the present invention.

The purpose of the present invention is to provide a portable electronic device, which can be easily and conveniently operated.

Detailed Description

In order to make the technical field person understand the scheme of the present invention better, the technical scheme in the embodiment of the present invention will be clearly and completely described below with reference to the attached drawings in the embodiment of the present invention. 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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1 and 2, an embodiment of the present invention provides a one-key multifunctional application circuit, including: the KEY circuit is used for generating a KEY control signal POWER _ KEY; as shown in fig. 2, the key circuit includes: the device comprises a control key S1, a resistor R41 and a resistor R40, wherein one end of the control key is connected with a first power supply V _ SYS through a diode D10; one end of the resistor R41 is connected with the other end of the control key S1, and the other end of the resistor R41 is connected with a reference ground; one end of the resistor R40 is connected to the one end of the resistor R41, and the other end of the resistor R40 is connected to the POWER input control circuit to output the KEY control signal POWER _ KEY. Through the one-way conductivity of the diode D10, the reverse power voltage can be prevented from being output after the power is reversely connected, so that the back-end circuit is protected. In use, the control key S1 may be manually depressed. Thus, the first power supply V _ SYS may be output from the other end of the control key S1. And outputs the KEY control signal POWER _ KEY from the other end of the resistor R40 through the resistor R40. When the control KEY S1 is not pressed, the KEY control signal POWER _ KEY is a low level signal under the action of the pull-down level of the resistor R41. When the control KEY S1 is pressed, the KEY control signal POWER _ KEY is converted from a low level to a high level.

The POWER supply input control circuit is respectively connected with a first POWER supply V _ SYS and the KEY control circuit so as to control and output the first POWER supply V _ SYS under the action of the KEY control signal POWER _ KEY; as shown in fig. 2, the power input control circuit includes: the source electrode of the MOS tube Q3 is connected with the first power supply V _ SYS, the source electrode of the MOS tube Q3 is further connected with the grid electrode of the MOS tube Q3 through a resistor R13, and the drain electrode of the MOS tube Q3 is connected with the power supply circuit and controls and outputs the first power supply V _ SYS; the drain electrode of the MOS tube Q6 is connected with the grid electrode of the MOS tube Q3, the grid electrode of the MOS tube Q6 is connected with the output end of the KEY control signal POWER _ KEY through a resistor R22, the grid electrode of the MOS tube Q6 is also connected with the source electrode of the MOS tube Q6 through a resistor R23, and the source electrode of the MOS tube Q6 is connected with a reference ground.

Specifically, the MOS transistor Q3 is disposed on a power supply loop of the first power supply V _ SYS. In this way, the output of the first power supply V _ SYS can be switched. And the MOS tube Q6 is used for driving and controlling the conduction or the cut-off of the MOS tube Q3. In use, the control KEY S1 is turned on by pressing the control KEY S1, and a high level signal is output, so that the KEY control signal POWER _ KEY is a high level signal. The high level signal acts on the gate of the MOS transistor Q6, so that the MOS transistor Q6 is turned on. And then outputs a low level signal to the grid of the MOS transistor Q3, so that the MOS transistor Q3 is conducted. And after the MOS tube Q3 is conducted, the first power supply V _ SYS outputs. And the drain electrode output power supply of the MOS tube Q3 is used as a system power supply VSYS +.

The power supply circuit is connected with the power input control circuit to convert the first power supply V _ SYS into a second power supply WF _3V3, and the second power supply WF _3V3 is used for maintaining the conduction of the power input control circuit so as to maintain the output of the first power supply V _ SYS. As shown in fig. 2, the power supply circuit includes: and a power input end of the voltage converter U5 is connected with a drain electrode of the MOS tube Q3, and a power output end of the voltage converter U5 is connected with a grid electrode of the MOS tube Q6 through an inductor L2.

Specifically, the drain output POWER of the MOS transistor Q3 can be used as the system POWER supply VSYS + by the KEY control signal POWER _ KEY generated by the control KEY S1. However, the KEY control signal POWER _ KEY is usually short-lived, for example, the S1 KEY is pressed for less than 1 second. In order to continuously output and provide the system power supply VSYS + after the system is started, the conduction of the MOS transistor Q3 needs to be maintained. The system power supply VSYS + can be converted into a second power supply WF _3V3 through the voltage converter U5, and the second power supply WF _3V3 can be a 3.3V power supply. The second power supply WF _3V3 is output, passes through the diode D6 and the resistor R22, and then acts on the gate of the MOS transistor Q6, so that the MOS transistor Q6 is kept on. In this way, the drain of the MOS transistor Q6 maintains a low level output, and the MOS transistor Q3 also maintains conduction. Thereby maintaining the first power supply V SYS output. That is, by pressing the S1 key for less than 1 second, the output of the system power supply VSYS + can be realized, thereby supplying power to the system.

Referring to fig. 2, the power input control circuit further includes a MOS transistor Q7, a drain of the MOS transistor Q7 is connected to a gate of the MOS transistor Q6, a source of the MOS transistor Q7 is connected to a reference ground, and a gate of the MOS transistor Q7 is connected to an output terminal of a control terminal signal of the controller through a resistor R26. After the system power supply VSYS + is kept on, in order to realize the management of the system power supply VSYS +, the function of power-off shutdown is realized. And the MOS tube Q7 is used for realizing the closing of a system power supply VSYS +. Specifically, as shown in fig. 2, a system power supply shutdown signal BAT _ SHUT _ OFF may be output through a control terminal of the controller, and when the system power supply shutdown signal BAT _ SHUT _ OFF is a high level signal, the high level signal acts on the gate of the MOS transistor Q7, so that the MOS transistor Q7 may be turned on, and the drain of the MOS transistor Q7 outputs a low level signal, so that the gate of the MOS transistor Q6 is pulled down, and the MOS transistor Q6 is turned OFF. Thus, the MOS transistor Q3 is also turned off. The first power supply V _ SYS cannot be output from the drain of the MOS transistor Q3, and the system is shut down because there is no system power supply VSYS +.

The embodiment of the utility model provides a multi-functional application circuit of a KEY is used for producing button control signal POWER _ KEY through the keying circuit; the POWER input control circuit is respectively connected with a first POWER supply V _ SYS and the KEY control circuit so as to control and output the first POWER supply V _ SYS under the action of the KEY control signal POWER _ KEY; the power supply circuit is connected with the power input control circuit to convert the first power supply V _ SYS into a second power supply WF _3V3, and the second power supply WF _3V3 is used for maintaining the conduction of the power input control circuit so as to maintain the output of the first power supply V _ SYS. Therefore, through one control key, the power supply output control of a system power supply VSYS + of the electronic equipment can be realized, and the use of a manual switch is reduced.

Referring to fig. 1, the one-key multifunction application circuit further includes: and the load control circuit is connected with the power input control circuit so as to control and output the first power supply V _ SYS output by the power input control circuit. IN some applications, IN addition to the system power supply VSYS +, an equipment power supply V _ IN needs to be provided to supply power to the connected equipment, so that the equipment is started to operate, and when the equipment needs to operate, the equipment power supply V _ IN needs to be turned off. Referring to fig. 2, the load control circuit includes: the power supply comprises an MOS tube Q4 and an MOS tube Q5, wherein the source electrode of the MOS tube Q4 is connected with the drain electrode of the MOS tube Q3, the source electrode of the MOS tube Q4 is also connected with the grid electrode of the MOS tube Q4 through a resistor R14, and the drain electrode of the MOS tube Q4 controls and outputs a system power supply VSYS + output by the drain electrode of the MOS tube Q3; the drain electrode of the MOS transistor Q5 is connected with the gate electrode of the MOS transistor Q4, the gate electrode of the MOS transistor Q5 is connected with the output end of a control signal of the controller through a resistor R18, the gate electrode of the MOS transistor Q5 is also connected with the source electrode of the MOS transistor Q5 through a resistor R20, and the source electrode of the MOS transistor Q5 is also connected with a reference ground; and a voltage detection end of the controller is also connected with the KEY control signal POWER _ KEY so as to carry out cut-off control on the MOS tube Q5 according to the KEY control signal POWER _ KEY.

Specifically, as shown IN fig. 2, the MOS transistor Q4 is provided between the system power supply VSYS + and the device power supply V _ IN. Thus, the on/off of the device power supply V _ IN can be controlled by switching, and the MOS transistor Q5 can be driven by connecting the MOS transistor Q5 to the gate of the MOS transistor Q4. Specifically, when power needs to be supplied to the load device, a control end of the controller outputs a device power supply conduction signal CV _ HOST _ WAKE, and when the device power supply conduction signal CV _ HOST _ WAKE is at a high level, the high level signal acts on a gate of the MOS transistor Q5 through a diode D4 and a resistor R18, so that the MOS transistor Q5 is conducted. After the MOS transistor Q5 is conducted, the grid of the MOS transistor Q4 is pulled down to be a low level, and therefore the MOS transistor Q4 is conducted. Therefore, the system power supply VSYS + is output through the drain electrode of the MOS tube Q4, so that an equipment power supply V _ IN is provided for load equipment, and the load equipment is started and normally works. On the contrary, when the load device needs to be turned off, the control KEY S1 can be pressed for a short time less than 1 second after the load device is turned on, and a voltage detection end of the controller can perform cut-off control on the MOS transistor Q5 according to the KEY control signal POWER _ KEY by detecting the KEY control signal POWER _ KEY. For example, when the load device is powered on, and the controller detects that the KEY control signal POWER _ KEY is converted from a low level to a high level, the device POWER supply conduction signal CV _ HOST _ WAKE outputs a low level, and the low level causes the MOS transistors Q5 and Q4 to be respectively turned off. Thus, the device power supply V _ IN stops outputting, and the load device is shut down because there is no power supply. When the load device is not used, power can be saved.

Referring to fig. 1, the one-key multifunction application circuit further includes: and the voltage detection switch circuit is respectively connected with the KEY circuit and the POWER input control circuit so as to carry out output control on the first POWER supply V _ SYS through the POWER input control circuit under the action of the KEY control signal POWER _ KEY. Although the controller can output the system power supply OFF signal BAT _ SHUT _ OFF to control the cut-OFF of the MOS transistor Q6 and the MOS transistor Q3, the system power supply VSYS + can be turned OFF for output, so that the whole system is SHUT down. However, during use, the controller may crash due to software failures. Thus, the system power OFF signal BAT _ SHUT _ OFF may not be output by the controller. Thus, the system power supply VSYS + needs to be manually turned off. This function is realized by the voltage detection switch circuit. As shown in fig. 2, the source of the MOS transistor Q6 is connected to the reference ground through the voltage detection switch circuit; wherein the voltage detection switch circuit includes: the voltage monitoring circuit comprises a voltage monitoring integrated circuit U4 and an MOS tube Q8, wherein a POWER supply input detection end of the voltage monitoring integrated circuit U4 is connected with the KEY control signal POWER _ KEY output end of the KEY circuit; the grid of MOS pipe Q8 with voltage monitoring integrated circuit U4's detection signal output end is connected, MOS pipe Q8's source electrode with MOS pipe Q6's source electrode is connected, MOS pipe Q8's drain electrode is connected with reference ground.

Specifically, as shown in fig. 2, when the system power supply VSYS + needs to be manually turned off, the control key S1 is manually pressed frequently, for example, the pressing time may be 10 seconds, and the voltage monitoring integrated circuit U4 may output a high level signal when it detects that the input terminal is at a high level for a long time. The high level signal output by the voltage monitoring integrated circuit U4 acts on the gate of the MOS transistor Q8, so that the gate of the MOS transistor Q8 is turned off. Thus, the MOS transistor Q6 and the MOS transistor Q3 can be simultaneously cut off. Therefore, the system power supply VSYS + can be turned off to output, and the whole system is turned off. As shown in fig. 2, the detection setting terminal of the voltage monitoring integrated circuit U4 is also connected to a reference ground through a capacitor C18 to set the detection time. In use, the time of the output of the voltage monitoring circuit can be varied by setting the value of the capacitor C18.

Further, in an embodiment of the present invention, the one-key multifunctional application circuit further includes: the USB power supply circuit is respectively connected with the key circuit, the power input control circuit and the load control circuit so as to supply power to the key circuit, the power input control circuit and the load control circuit in a USB power supply mode; in the case of system shutdown, it is sometimes necessary to program the system device. In this application, the system device is connected to the program programming device. Such as a personal computer. At this time, power may be supplied through the USB interface.

Referring to fig. 2, the USB power supply circuit includes: the power supply comprises an MOS (metal oxide semiconductor) tube Q2, a diode D11, a diode D2 and a diode D5, wherein the source electrode of the MOS tube Q3 is connected with the first power supply V _ SYS through the MOS tube Q2; the source electrode of the MOS tube Q2 is connected with the source electrode of the MOS tube Q3, the drain electrode of the MOS tube Q2 is connected with the first power supply V _ SYS, the grid electrode of the MOS tube Q2 is connected with a reference ground through a resistor R16, and the grid electrode of the MOS tube Q2 is also connected with a USB power supply output end through a resistor R12; the anode of the diode D11 is connected with the USB power supply output end, and the cathode of the diode D11 is connected with the one end of the control key S1; the anode of the diode D2 is connected with the USB power supply output end, and the cathode of the diode D2 is connected with the drain electrode of the MOS tube Q3; the anode of the diode D5 is connected with the USB power supply output end, and the cathode of the diode D5 is connected with the grid of the MOS tube Q5 through the resistor R18. The program burning control circuit is connected with the KEY circuit to output a burning control signal under the action of the KEY control signal POWER _ KEY.

Specifically, as shown IN fig. 2, IN the program programming mode, both the system power supply VSYS + and the device power supply V _ IN are supplied by the USB power supply output terminal. Through MOS pipe Q2 setting on first power supply V _ SYS's output circuit, MOS pipe Q2's grid is the high level when USB power supply output comes the power supply to make MOS pipe Q2 cut off, first power supply V _ SYS does not have to the external output. The USB power supply passes through diode D2 output, as system power supply VSYS +. And the USB power supply acts on the grid electrode of the MOS tube Q5 through the diode D5, so that the MOS tube Q5 and the MOS tube Q4 are conducted simultaneously. Therefore, the USB power supply can be output through the MOS tube Q4 and used as the equipment power supply V _ IN to supply power to the equipment. The USB power supply also supplies power to the program burning control circuit through a diode D11. Before starting up, press S1 button and then insert USB to enter downloading program mode. IN the shutdown mode, no matter whether the battery supplies power, the S1 key is pressed first and then the USB is inserted, the whole machine is supplied with power by the VBUS, at the moment, the voltage of V3 is changed to be high to conduct Q9, the voltage of V8 is changed to be high to conduct Q5, the voltage of V9 is changed to be 0 to conduct Q4, and the back-end system load control circuit unit 40 outputs a power supply V _ IN to enter the startup downloading program mode.

In specific application, the one-key multifunctional application circuit has four working modes:

(1) Starting machine when S1 key is pressed for less than 1 second

Under the normal POWER supply, the initial voltage of the voltage V2 is 0 level so that the PMOS Q8 is initially conducted to the ground, the high level signal POWER _ KEY is output to the front-end POWER input control circuit unit 30 and the external MCU control circuit by pressing the S1 KEY for a short time to detect, the voltage V5 gets high level, the Q6 is conducted, and at the same time, the high level of the voltage V6 is converted to 0 level so that the Q3 conducts and outputs the POWER voltage VSYS +, which is input to the U5 POWER conversion integrated circuit, the WIFI POWER supply circuit outputs the POWER voltage WF _3V3 to the front-end POWER input control circuit unit 30 and keeps the Q6 conducted, the front-end POWER input control circuit unit 30 keeps outputting the POWER voltage VSYS + to the back-end system load control circuit unit 40, and at the same time, the external MCU control circuit detects that the POWER _ KEY signal outputs the high level signal hst _ WAKE so that the voltage V8 drives the Q5 to be conducted, the voltage V9 is converted from high level to 0 level Q4, and the back-end system load control circuit unit 40 outputs the POWER voltage V _ IN.

(2) Entering a WIFI setting mode by pressing an S1 key for less than 1 second after starting up

After the starting is finished, the S1 KEY is pressed for a short time, the external MCU detects that the POWER _ KEY signal is changed from 0 level to high level, and then the output signal is changed from 0 level to

CV _ HOST _ WAKE goes high, while V8 goes 0 resulting in Q5 being turned off, the back-end system load control circuit unit 40

And the power supply voltage V _ IN is not output any more, namely the load of the back-end system is turned off, and the WIFI setting mode is entered.

(3) And after the power is turned on, the S1 key is pressed for 5 seconds to enter a power-off mode.

After the POWER-on state, the S1 KEY is pressed for a long time, and the external MCU detects that the POWER _ KEY signal is changed from 0 level to high level for 5 seconds and then outputs a signal BAT _ SHUT _ OFF

The voltage level of the front end power supply is changed from 0 level to high level, the V4 voltage is changed to high level, the Q7 is switched on, the V5 voltage is changed to 0 level, the Q6 is switched off, and the front end power supply is switched on

The input control circuit unit 30 does not output the power VSYS + any more and thus is entirely powered off to enter the shutdown mode.

(4) And in any state, the S1 key is pressed for 10 seconds to enter a hardware reset mode.

When the whole machine is in a dead halt or works normally, the S1 key is pressed for a long time in any state, and after the V1 voltage is changed into the high level for 10 seconds, the U4 voltage monitoring circuit outputs the V2 voltage which is changed into the high level to cause Q8 to be turned off, so that the front-end power input control circuit unit 30 does not output the power voltage VSYS +, the whole power-off mode is realized, and the S1 key needs to be pressed for a short time again to enter the power-on mode.

(5) Before starting up, press S1 button and then insert USB to enter downloading program mode.

IN the shutdown mode, no matter whether the battery supplies power, the S1 key is pressed first and then the USB is inserted, the whole machine is supplied with power by the VBUS, at the moment, the voltage of V3 is changed to be high to conduct Q9, the voltage of V8 is changed to be high to conduct Q5, the voltage of V9 is changed to be 0 to conduct Q4, and the back-end system load control circuit unit 40 outputs a power supply V _ IN to enter the startup downloading program mode.

One-key multifunctional application technology (startup mode + WIFI setting mode + shutdown mode + hardware reset mode + USB download program mode)

(1) And starting the computer when the S1 key is pressed for less than 1 second.

(2) And after the computer is started, the WIFI setting mode is entered by pressing the S1 key for less than 1 second.

(3) And after the power is turned on, the S1 key is pressed for 5 seconds to enter a power-off mode.

(4) And in any state, the S1 key is pressed for 10 seconds to enter a hardware reset mode.

(5) Before starting up, the S1 key is pressed and then the USB is inserted to enter a downloading program mode.

The circuit is matched with a load control circuit, a voltage detection switch circuit, a USB power supply circuit and a program burning control circuit through a key circuit, a power input control circuit, a power supply circuit. The multifunctional application control of one key can be realized, and the use of control keys is greatly reduced.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalent substitutions can be made on the technical solutions described in the foregoing embodiments or some technical features thereof. All utilize the equivalent structure that the specification and the attached drawing content of the utility model were done, direct or indirect application is in other relevant technical field, all the same reason is within the utility model discloses the patent protection within scope.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the invention, and that those skilled in the art may make variations, modifications, substitutions and alterations herein without departing from the spirit and scope of the invention.

Claims (10)

1. A one-key multi-function application circuit, comprising:

a key circuit for generating a key control signal;

the power input control circuit is respectively connected with a first power supply and the key circuit so as to control and output the first power supply under the action of the key control signal;

and the power supply circuit is connected with the power input control circuit so as to convert the first power supply into a second power supply, and the second power supply maintains the conduction of the power input control circuit so as to maintain the output of the first power supply.

2. The one-key multi-function application circuit of claim 1, further comprising:

and the load control circuit is connected with the power input control circuit so as to control and output the first power supply output by the power input control circuit.

3. The one-key multi-function application circuit of claim 2, further comprising:

and the voltage detection switch circuit is respectively connected with the key circuit and the power input control circuit so as to control the output of the first power supply through the power input control circuit under the action of the key control signal.

4. The one-key multi-function application circuit of claim 3, further comprising:

the USB power supply circuit is respectively connected with the key circuit, the power input control circuit and the load control circuit so as to supply power to the key circuit, the power input control circuit and the load control circuit in a USB power supply mode;

and the program burning control circuit is connected with the key circuit and outputs a burning control signal under the action of the key control signal.

5. The one-key multi-function application circuit of claim 4, wherein the key circuit comprises:

one end of the control key S1 is connected with a first power supply through a diode D10;

one end of the resistor R41 is connected with the other end of the control key S1, and the other end of the resistor R41 is connected with a reference ground;

one end of the resistor R40 is connected with the one end of the resistor R41, and the other end of the resistor R40 is connected with the power input control circuit to output the key control signal.

6. The one-touch multi-function application circuit of claim 5, wherein the power input control circuit comprises:

the source electrode of the MOS tube Q3 is connected with the first power supply, the source electrode of the MOS tube Q3 is also connected with the grid electrode of the MOS tube Q3 through a resistor R13, and the drain electrode of the MOS tube Q3 is connected with the power supply circuit to control and output the first power supply;

MOS pipe Q6, MOS pipe Q6's drain electrode with MOS pipe Q3's grid is connected, MOS pipe Q6's grid pass through resistance R22 with key control signal's output is connected, MOS pipe Q6's grid still pass through resistance R23 with MOS pipe Q6's source electrode is connected, MOS pipe Q6's source electrode is connected with reference ground.

7. The one-key-multi-function application circuit of claim 6, wherein the power supply circuit comprises:

a power supply input end of the voltage converter U5 is connected with a drain electrode of the MOS tube Q3, and a power supply output end of the voltage converter U5 is connected with a grid electrode of the MOS tube Q6 through an inductor L2;

the power input control circuit further comprises an MOS transistor Q7, a drain electrode of the MOS transistor Q7 is connected with a grid electrode of the MOS transistor Q6, a source electrode of the MOS transistor Q7 is connected with a reference ground, and a grid electrode of the MOS transistor Q7 is connected with an output end of a control end signal of the controller through a resistor R26.

8. The one-key multi-function application circuit according to claim 6 or 7, wherein the load control circuit comprises:

the source electrode of the MOS tube Q4 is connected with the drain electrode of the MOS tube Q3, the source electrode of the MOS tube Q4 is also connected with the grid electrode of the MOS tube Q4 through a resistor R14, and the drain electrode of the MOS tube Q4 controls and outputs a system power supply output by the drain electrode of the MOS tube Q3;

the drain electrode of the MOS transistor Q5 is connected with the gate electrode of the MOS transistor Q4, the gate electrode of the MOS transistor Q5 is connected with the output end of a control signal of the controller through a resistor R18, the gate electrode of the MOS transistor Q5 is also connected with the source electrode of the MOS transistor Q5 through a resistor R20, and the source electrode of the MOS transistor Q5 is also connected with a reference ground; and a voltage detection end of the controller is also connected with the key control signal so as to carry out cut-off control on the MOS tube Q5 according to the key control signal.

9. The one-key multi-function application circuit of claim 6 or 7, wherein the source of the MOS transistor Q6 is connected to a reference ground through the voltage detection switch circuit; wherein the voltage detection switch circuit includes:

the power supply input detection end of the voltage monitoring integrated circuit is connected with the key control signal output end of the key circuit;

MOS pipe Q8, MOS pipe Q8's grid with voltage monitoring integrated circuit's detected signal output end is connected, MOS pipe Q8's source electrode with MOS pipe Q6's source electrode is connected, MOS pipe Q8's drain electrode is connected with reference ground.

10. The one-key multi-function application circuit of claim 9, wherein the USB power supply circuit comprises:

the source electrode of the MOS transistor Q3 is connected with the first power supply through the MOS transistor Q2; the source electrode of the MOS tube Q2 is connected with the source electrode of the MOS tube Q3, the drain electrode of the MOS tube Q2 is connected with the first power supply, the grid electrode of the MOS tube Q2 is connected with a reference ground through a resistor R16, and the grid electrode of the MOS tube Q2 is also connected with a USB power supply output end through a resistor R12;

the anode of the diode D11 is connected with the USB power supply output end, and the cathode of the diode D11 is connected with the one end of the control key S1;

the anode of the diode D2 is connected with the USB power supply output end, and the cathode of the diode D2 is connected with the drain electrode of the MOS tube Q3;

and the anode of the diode D5 is connected with the USB power supply output end, and the cathode of the diode D5 is connected with the grid of the MOS tube Q5 through the resistor R18.

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