CN220894858U - Key wake-up circuit and power terminal - Google Patents
Key wake-up circuit and power terminal Download PDFInfo
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- CN220894858U CN220894858U CN202322653453.1U CN202322653453U CN220894858U CN 220894858 U CN220894858 U CN 220894858U CN 202322653453 U CN202322653453 U CN 202322653453U CN 220894858 U CN220894858 U CN 220894858U
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Abstract
The application provides a key wake-up circuit and an electric power terminal, and relates to the field of key wake-up of electric power terminals. The circuit comprises a power-down detection module, a wake-up module and a discharge module, wherein one end of the discharge module is respectively and electrically connected with the power-down detection module and the wake-up module, the other end of the discharge module is electrically connected with a backup power supply, and the other end of the power-down detection module is electrically connected with an external power supply; the power-down detection module is used for being turned off when the external power supply is powered down; the wake-up module is used for sending a driving signal to the discharge module when the power-down detection module is turned off and the wake-up signal is received, so that the discharge module controls the backup power supply to discharge. The key wake-up circuit and the power terminal provided by the application have the advantages of simple circuit, low cost, strong carrying capacity, high performance reliability and the like.
Description
Technical Field
The application relates to the field of key awakening of power terminals, in particular to a key awakening circuit and a power terminal.
Background
With the continuous updating of the power terminal, the key wakeup is an indispensable basic function of the terminal according to the requirements of the power terminal specification. At present, the power supply mode for the power terminal is divided into two kinds, the first is to directly supply power to the outside of the power terminal, and the second is the backup power supply, and the backup power supply includes super capacitor and battery inside the power terminal, because the capacity of battery and capacitor is limited, can not supply power for the power terminal for a long time, the electric department requires: when the terminal is only powered by the standby power supply, various functions such as display, uplink communication and the like are normal. If no key operation is performed within 3 minutes, the terminal should enter a shutdown state. In the shutdown state, the terminal is started by pressing the cancel key for 3 seconds. For the corresponding electric department requirements, the terminal needs to have a key wake-up function.
At present, the key wake-up circuit of the power terminal mainly controls the MOS tube to control the standby power supply to discharge so as to enable the terminal to work, but the scheme has the advantages of complex circuit, high cost, poor carrying capacity and higher requirement on the electric stress of the MOS tube.
In summary, the key wake-up circuit of the power terminal in the prior art has the problems of complex circuit, high cost, poor carrying capacity and low performance reliability.
Disclosure of utility model
The application aims to provide a key wake-up circuit which solves the problems of complex circuit, high cost, poor carrying capacity and low performance reliability in the prior art.
Another object of the present application is to provide a power terminal, which solves the problems of complex circuit, high cost, poor load capacity and low performance reliability in the prior art.
The application is realized in the following way:
in one aspect, an embodiment of the application provides a key wake-up circuit, which comprises a power-down detection module, a wake-up module and a discharge module, wherein one end of the discharge module is respectively and electrically connected with the power-down detection module and the wake-up module, the other end of the discharge module is electrically connected with a backup power supply, and the other end of the power-down detection module is electrically connected with an external power supply; wherein,
The power-down detection module is used for being turned off when the external power supply is powered down;
The wake-up module is used for sending a driving signal to the discharge module when the power-down detection module is turned off and the wake-up signal is received, so that the discharge module controls the backup power supply to discharge.
Further, the discharging module comprises a current limiting protection chip, and the enabling end of the current limiting protection chip is electrically connected with the output ends of the power failure detection module and the wake-up module respectively;
The current limiting protection chip is used for controlling the backup power supply to discharge when the enabling end receives the driving signal.
Further, the discharging module further comprises a soft start capacitor and a current limiting resistor, one end of the current limiting resistor is connected with a current limiting pin of the current limiting protection chip, and the other end of the current limiting resistor is grounded; one end of the soft start capacitor is connected with a soft start pin of the current-limiting protection chip, and the other end of the soft start capacitor is grounded.
Further, the wake-up module comprises a key module and a soft control module, and the enabling end of the current-limiting protection chip is respectively and electrically connected with the output ends of the key module and the soft control module.
Further, the button module includes physical button, first resistance, second resistance, third resistance and first switch tube, the one end of second resistance is connected the physical button, the other end is connected the control end of first switch tube, the one end of first resistance with the second resistance electricity is connected, the other end with the first port electricity of first switch tube is connected, the one end of third resistance with the second port electricity of first switch tube is connected, the other end with the enabling end electricity of current-limiting protection chip is connected.
Further, the soft control module comprises a fourth resistor and a first diode, one end of the fourth resistor is connected with the anode of the first diode, the other end of the fourth resistor is connected with the MCU, and the cathode of the first diode is electrically connected with the enabling end of the current-limiting protection chip.
Further, the power failure detection module comprises a fifth resistor and a second switching tube, a control end of the second switching tube is electrically connected with the fifth resistor, a first port is electrically connected with an enabling end of the current-limiting protection chip, and a second port is grounded.
Further, the key wake-up circuit further comprises a boosting module, the input end of the boosting module is electrically connected with the output end of the discharging module, the boosting module comprises a boosting chip and a voltage dividing circuit, and the voltage dividing circuit is electrically connected with the output end of the boosting chip and the feedback end respectively.
Further, the voltage dividing circuit comprises a sixth resistor, a seventh resistor and an eighth resistor, the sixth resistor, the seventh resistor and the eighth resistor are sequentially connected in series, one end of the sixth resistor is grounded, one end of the eighth resistor is electrically connected with the output end of the boost chip, and the feedback end of the boost chip is connected between the sixth resistor and the seventh resistor.
On the other hand, the embodiment of the application also provides a power terminal, which comprises the key wake-up circuit according to any one of the previous embodiments.
Compared with the prior art, the application has the following beneficial effects:
The application provides a key wake-up circuit and a power terminal, wherein the key wake-up circuit comprises a power-down detection module, a wake-up module and a discharge module, one end of the discharge module is respectively and electrically connected with the power-down detection module and the wake-up module, the other end of the discharge module is electrically connected with a backup power supply, and the other end of the power-down detection module is electrically connected with an external power supply; the power-down detection module is used for being turned off when the external power supply is powered down; the wake-up module is used for sending a driving signal to the discharge module when the power-down detection module is turned off and the wake-up signal is received, so that the discharge module controls the backup power supply to discharge. The key wake-up circuit controls the backup power supply to discharge by controlling the current-limiting protection chip, so that the key wake-up circuit has the advantages of simplicity, low cost, strong carrying capacity, high performance reliability and the like.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a schematic structural diagram of a key wake-up circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a discharge module according to an embodiment of the present application;
Fig. 3 is a schematic circuit diagram of a power failure detection module according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a key module according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a soft control module according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another key wake-up circuit according to an embodiment of the present application;
fig. 7 is a schematic circuit diagram of a boost module according to an embodiment of the present application;
Fig. 8 is a schematic circuit diagram of a filtering module according to an embodiment of the present application.
Icon: 100-key wake-up circuit; 110-a power-down detection module; a 120-wake-up module; 130-a discharge module; 140-a boost module; r492-current limiting resistor; C427-Soft Start capacitor; r346-a first voltage dividing resistor; r439-a second voltage divider resistor; r316-a first resistor; r339-a second resistor; r345-third resistance; r438-fourth resistance; r441-fifth resistor; r488-sixth resistance; r490-seventh resistance; r491-eighth resistor; V311-PNP triode; V314-NPN triode; VD 345-first diode; VD 325-second diode; VD 326-third diode; c423-a first capacitor; c425-a second capacitance; CE 207-third capacitance.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The term "coupled" is to be interpreted broadly, as being a fixed connection, a removable connection, or an integral connection, for example; can be directly connected or indirectly connected through an intermediate medium.
At present, the key wake-up circuit of the power terminal mainly controls the MOS tube to control the standby power supply to discharge, so that the power terminal works. However, the scheme has the advantages of complex circuit, high cost, poor carrying capacity and higher requirement on the electric stress of the MOS tube.
In view of the above, the present application provides a key wake-up circuit with low cost, simple circuit and high performance reliability, which controls the current limiting protection chip to control the backup power discharging.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present application provides a key wake-up circuit 100, where the key wake-up circuit 100 includes a power-down detection module 110, a wake-up module 120 and a discharge module 130,
One end of the discharging module 130 is respectively electrically connected with the power-down detection module 110 and the wake-up module 120, the other end of the discharging module 130 is electrically connected with a backup power supply, and the other end of the power-down detection module 110 is electrically connected with an external power supply; the power-down detection module 110 is used for being turned off when the external power supply is powered down; the wake-up module 120 is configured to send a driving signal to the discharge module 130 when the power-down detection module 110 is turned off and the wake-up signal is received, so that the discharge module 130 controls the backup power supply to discharge.
Referring to fig. 2, fig. 2 shows a circuit schematic diagram of the discharging module 130, the discharging module 130 includes a current-limiting protection chip, and an enable end of the current-limiting protection chip is electrically connected to output ends of the power failure detection module 110 and the wake-up module 120 at a signal point a through a first voltage dividing resistor R346 and a second voltage dividing resistor R439. The current limiting protection chip can be in a working state only when the enabling end is in a high level, so that the standby power supply is controlled to discharge.
The current-limiting pin of the current-limiting protection chip is connected with one end of the current-limiting resistor R492, the other end of the current-limiting resistor R492 is grounded, and the maximum value of the output current is regulated by regulating the resistance value of the current-limiting resistor R492.
In the embodiment of the present application, the type of the current limiting protection chip is MP5036, the maximum value of the output current is 2.78A, and of course, the type and the current limiting value of the current limiting protection chip may be adjusted according to the actual situation, which is not particularly limited in the embodiment.
Since a large capacity capacitor is usually present in the power supply circuit, a large surge current is required for the moment of applying a voltage to the capacitor, and a power supply short circuit is likely to be caused.
In view of this, in order to ensure that the current-limiting protection chip is not damaged during the start-up, as an implementation manner, a soft start pin of the current-limiting protection chip is connected to one end of the soft start capacitor C427, and the other end of the soft start capacitor C427 is grounded. The soft start time is adjusted by adjusting the capacitance of the soft start capacitor C427, so that the surge current is reduced, the output voltage is slowly increased, and the overshoot value of the output voltage is reduced.
Referring to fig. 3, fig. 3 shows a circuit schematic of the power failure detection module 110, in an embodiment of the application, the power failure detection module 110 includes a fifth resistor R441 and a second switching tube, wherein a control end of the second switching tube is electrically connected to the fifth resistor R441, a first port is electrically connected to an enable end of the current-limiting protection chip, and a second port is grounded.
Preferably, in the embodiment of the present application, the second switching tube is an NPN triode V314, that is, a base electrode of the NPN triode V314 is electrically connected to the fifth resistor R441, a collector electrode is electrically connected to an enable terminal of the current-limiting protection chip, and an emitter electrode is grounded. NPN triode V314 is used as an output signal bit by the collector, and can realize the inverse logic output of a signal, namely, the collector outputs a low level when the base inputs a high level, and the collector outputs a high level when the base inputs a low level.
Because one end of the POWER failure detection module 110 is connected to an external POWER supply, when the external POWER supply supplies POWER, the chk_power pin connected to the external POWER supply is at a high level, that is, the base of the NPN triode V314 inputs a high level, the NPN triode V314 is turned on, at this time, the enabling end of the current-limiting protection chip is grounded through the NPN triode V314, that is, the enabling end is at a low level, and the current-limiting protection chip is in a closed state.
When the external POWER supply is powered down, the CHK_POWER pin connected with the external POWER supply is at a low level, namely the base electrode of the NPN triode V314 inputs a low level, and the NPN triode V314 is cut off.
Based on the above design, it is ensured that the discharging module 130 is in the off state regardless of whether the wake-up module 120 works or not under the condition of the external power supply; in the case of power failure of the external power supply, the power failure detection module 110 is in an off state, and at this time, the wake-up module 120 may control the operation state of the discharge module 130.
Specifically, referring to fig. 4 and 5, in an embodiment of the present application, the wake-up module 120 includes a key module and a soft control module, fig. 4 shows a circuit schematic of the key module, and fig. 5 shows a circuit schematic of the soft control module. The enabling end of the current-limiting protection chip is electrically connected with the output ends of the key module and the soft control module respectively.
As shown in fig. 4, the key module includes a physical key, a first resistor R316, a second resistor R339, a third resistor R345, and a first switching tube. One end of the second resistor R339 is connected with the physical key, the other end of the second resistor R339 is connected with the control end of the first switch tube, one end of the first resistor R316 is electrically connected with the second resistor R339, the other end of the second resistor R316 is electrically connected with the first port of the first switch tube, one end of the third resistor R345 is electrically connected with the second port of the first switch tube, and the other end of the third resistor R345 is electrically connected with the enabling end of the current-limiting protection chip.
Preferably, in the embodiment of the present application, the first switching transistor is a PNP transistor V311, that is, a base electrode of the PNP transistor V311 is electrically connected to the second resistor R339, a collector electrode is electrically connected to the third resistor R345, an emitter electrode is electrically connected to the first resistor R316, and an output signal of the PNP transistor V311 is output from the emitter electrode.
When the physical KEY is pressed, the pin is grounded, namely the base electrode of the PNP triode V311 inputs a low level, the PNP triode V311 is conducted, the enabling end of the current-limiting protection chip is at a high level, and the current-limiting protection chip starts to work.
In order to solve the problem that the discharging module 130 stops discharging after the physical key is released, in the embodiment of the present application, the wake-up module 120 further includes a soft control module.
Specifically, referring to fig. 5, fig. 5 shows a schematic circuit diagram of a soft control module, and the soft control module includes a fourth resistor R438 and a first diode VD345. One end of the fourth resistor R438 is electrically connected to the MCU, the other end is connected to the anode of the first diode VD345, and the cathode of the first diode VD345 is electrically connected to the enable end of the current limiting protection chip.
When the external power supply is powered down and the physical key is pressed, the current-limiting protection chip controls the backup power supply to discharge, at the moment, the MCU is powered up, and the CTRL_I/O_BATT pin is at a high level. When the physical key is released, although the PNP triode V311 is cut off, the CTRL_I/O_BATT pin in the soft control module is at a high level, and the first diode VD345 is conducted, so that the enabling end of the current-limiting protection chip is at a high level, and the current-limiting protection chip is still in a working state, namely the soft control module ensures that the battery can continuously discharge after the physical key is released.
The voltage value of the battery can be reduced along with the reduction of the actual electric quantity of the battery, and the interface voltage cannot be fluctuated excessively when the standby power supply supplies power due to the requirements of the electric department.
In view of this, in order to stabilize the voltage interface voltage to the target value, as an implementation manner, referring to fig. 6, the key wake-up circuit 100 further includes a boost module 140 according to an embodiment of the present application. The input end of the boost module 140 is electrically connected to the output end of the discharge module 130.
Referring to fig. 7, fig. 7 shows a circuit schematic of a boost module 140, where the boost module 140 includes a boost chip and a voltage dividing circuit, and the voltage dividing circuit is electrically connected to an output end and a feedback end of the boost chip respectively.
And the voltage output by the current limiting protection chip is boosted by the boosting chip to finally obtain the target output voltage. It should be noted that, the target output voltage can be adjusted according to the actual requirement, and the output voltage of the boost chip can be adjusted through the voltage dividing circuit, and in the embodiment of the application, the target output voltage is 5.2V.
Specifically, the voltage dividing circuit includes a sixth resistor R488, a seventh resistor R490, and an eighth resistor R491. The sixth resistor R488, the seventh resistor R490 and the eighth resistor R491 are sequentially connected in series, one end of the sixth resistor R488 is grounded, one end of the eighth resistor R491 is electrically connected with the output end of the boost chip, and the feedback end of the boost chip is connected between the sixth resistor R488 and the seventh resistor R490. By adjusting the ratio of the resistance values of the sixth resistor R488, the seventh resistor R490 and the eighth resistor R491, the voltage of 5.2V can be obtained at the output end of the boost chip.
In the embodiment of the application, after the output voltage of the boost chip is filtered in parallel by the first capacitor C423 and the second capacitor C425 and the second diode VD325 and the third diode VD326 are isolated in parallel, a target voltage of 5.2V is obtained. Finally, the target voltage is filtered again by the third capacitor CE207 as shown in fig. 8.
Optionally, the embodiment of the present application further provides an electric power terminal, where the electric power terminal includes the key wake-up circuit 100 according to any one of the foregoing embodiments.
In summary, the embodiment of the application provides a key wake-up circuit and a power terminal, when an external power supply is powered down, a power-down detection module is turned off, and when the wake-up module receives a wake-up signal, namely a physical key is pressed down, a current-limiting protection chip in a discharge module starts to work, so that the discharge of a backup power supply is controlled.
The soft control module in the wake-up module ensures that the discharge module can still work continuously after the physical key is released. The discharging module also comprises a soft start capacitor, the soft start capacitor is connected with the current-limiting protection chip, surge current is reduced, and output voltage is slowly increased, so that the current-limiting protection chip is prevented from being damaged when being started. The input end of the boosting module is electrically connected with the output end of the discharging module, so that the interface voltage can be ensured to be stabilized to a target value when the standby power supply supplies power.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The key wake-up circuit is characterized by comprising a power-down detection module, a wake-up module and a discharge module, wherein one end of the discharge module is respectively and electrically connected with the power-down detection module and the wake-up module, the other end of the discharge module is electrically connected with a backup power supply, and the other end of the power-down detection module is electrically connected with an external power supply; wherein,
The power-down detection module is used for being turned off when the external power supply is powered down;
The wake-up module is used for sending a driving signal to the discharge module when the power-down detection module is turned off and the wake-up signal is received, so that the discharge module controls the backup power supply to discharge.
2. The key wake-up circuit of claim 1, wherein the discharging module comprises a current limiting protection chip, and an enabling end of the current limiting protection chip is electrically connected with the power-down detection module and an output end of the wake-up module respectively;
The current limiting protection chip is used for controlling the backup power supply to discharge when the enabling end receives the driving signal.
3. The key wake-up circuit of claim 2, wherein the discharging module further comprises a soft start capacitor and a current limiting resistor, one end of the current limiting resistor is connected with a current limiting pin of the current limiting protection chip, and the other end of the current limiting resistor is grounded; one end of the soft start capacitor is connected with a soft start pin of the current-limiting protection chip, and the other end of the soft start capacitor is grounded.
4. The key wake-up circuit of claim 2, wherein the wake-up module comprises a key module and a soft control module, and the enabling end of the current limiting protection chip is electrically connected with the output ends of the key module and the soft control module respectively.
5. The key wake-up circuit of claim 4, wherein the key module comprises a physical key, a first resistor, a second resistor, a third resistor and a first switch tube, one end of the second resistor is connected with the physical key, the other end of the second resistor is connected with a control end of the first switch tube, one end of the first resistor is electrically connected with the second resistor, the other end of the first resistor is electrically connected with a first port of the first switch tube, one end of the third resistor is electrically connected with a second port of the first switch tube, and the other end of the third resistor is electrically connected with an enabling end of the current-limiting protection chip.
6. The key wake-up circuit of claim 4, wherein the soft control module comprises a fourth resistor and a first diode, one end of the fourth resistor is connected with an anode of the first diode, the other end of the fourth resistor is connected with the MCU, and a cathode of the first diode is electrically connected with an enabling end of the current-limiting protection chip.
7. The key wake-up circuit of claim 2, wherein the power-down detection module comprises a fifth resistor and a second switching tube, a control end of the second switching tube is electrically connected with the fifth resistor, a first port is electrically connected with an enabling end of the current-limiting protection chip, and a second port is grounded.
8. The key wake-up circuit of claim 1, further comprising a boost module, wherein an input end of the boost module is electrically connected with an output end of the discharge module, the boost module comprises a boost chip and a voltage dividing circuit, and the voltage dividing circuit is electrically connected with an output end and a feedback end of the boost chip respectively.
9. The key wake-up circuit of claim 8, wherein the voltage dividing circuit comprises a sixth resistor, a seventh resistor and an eighth resistor, the sixth resistor, the seventh resistor and the eighth resistor are sequentially connected in series, one end of the sixth resistor is grounded, one end of the eighth resistor is electrically connected with the output end of the boost chip, and the feedback end of the boost chip is connected between the sixth resistor and the seventh resistor.
10. An electrical terminal comprising a key wake-up circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322653453.1U CN220894858U (en) | 2023-09-28 | 2023-09-28 | Key wake-up circuit and power terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322653453.1U CN220894858U (en) | 2023-09-28 | 2023-09-28 | Key wake-up circuit and power terminal |
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| CN220894858U true CN220894858U (en) | 2024-05-03 |
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| CN202322653453.1U Active CN220894858U (en) | 2023-09-28 | 2023-09-28 | Key wake-up circuit and power terminal |
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