CN211830739U - Light touch key power supply circuit and electronic equipment - Google Patents
Light touch key power supply circuit and electronic equipment Download PDFInfo
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- CN211830739U CN211830739U CN202020764366.7U CN202020764366U CN211830739U CN 211830739 U CN211830739 U CN 211830739U CN 202020764366 U CN202020764366 U CN 202020764366U CN 211830739 U CN211830739 U CN 211830739U
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Abstract
The utility model relates to a button start circuit technical field especially relates to a dab button supply circuit and electronic equipment. The power supply circuit for the touch key comprises: the key detection unit, the power supply self-locking unit, the signal conversion unit and the power supply follow current switch; the key detection unit is used for sending a power supply trigger signal to the power supply follow current switch when the startup and shutdown key is triggered and the circuit to be powered is in a state to be powered; the signal conversion unit is used for continuously sending a power supply self-locking signal to the power supply self-locking unit when the circuit to be powered receives the power supply current transmitted by the power supply freewheeling switch; the power supply self-locking unit is used for receiving a power supply self-locking signal, converting the power supply self-locking signal into a power supply trigger signal and continuously outputting the power supply trigger signal to the power supply follow current switch; and the power supply follow current switch is used for conducting a path between the power supply and the circuit to be supplied with power when receiving the power supply trigger signal. The light-touch on-off of the electronic product is realized through the circuit.
Description
Technical Field
The utility model relates to a button start circuit technical field especially relates to a dab button supply circuit and electronic equipment.
Background
The traditional touch switch circuit can jump along with the pressing of a user, and has no corresponding self-locking level; the function of switching between normal open and normal close can not be realized; the product can only be designed to be in a standby state without power off when being turned off, so that the standby time of electronic design is seriously influenced. If the touch switch is applied to a power supply system, the touch switch is required to be designed by adopting the pull switch, or the touch switch is required to be pressed for a long time to realize the touch switch; many products may not select to design a circuit for pulling the switch due to ID limitation; and the user experience is destroyed when the computer is started up by using a long-time key.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a touch key power supply circuit and an electronic device, which are designed to be turned on and off via a short-time key.
In order to achieve the above object, the utility model provides a touch button supply circuit, touch button supply circuit includes: the key detection unit, the power supply self-locking unit, the signal conversion unit and the power supply follow current switch; wherein the content of the first and second substances,
the detection end of the key detection unit is connected with the output end of the on-off key; the second output end of the key detection unit is connected with the input end of the signal conversion unit; the output end of the signal conversion unit is connected with the controlled end of the power supply self-locking unit; the first output end of the key detection unit is connected with the controlled end of the power supply follow current switch, and the output end of the power supply self-locking unit is connected with the controlled end of the power supply follow current switch;
the key detection unit is used for sending a power supply trigger signal to the power supply follow current switch when the power on/off key is triggered and the circuit to be powered is in a state to be powered;
the signal conversion unit is used for continuously sending a power supply self-locking signal to the power supply self-locking unit when the circuit to be powered receives the power supply current transmitted by the power supply freewheeling switch;
the power supply self-locking unit is used for receiving the power supply self-locking signal, converting the power supply self-locking signal into a power supply trigger signal and continuously outputting the power supply trigger signal to the power supply follow current switch;
and the power supply follow current switch is used for conducting a path between a power supply and a circuit to be supplied with power when the power supply trigger signal is received.
Preferably, the key detection unit includes a first diode, a first pin of the first diode is connected to the controlled end of the power supply freewheeling switch, a third pin of the first diode is connected to the output end of the power on/off key, and when the power on/off key is triggered, the first pin outputs a low potential as the power supply trigger signal to the power supply freewheeling switch.
Preferably, a second pin of the first diode is connected to an input end of the signal conversion unit, and when the circuit to be powered is in a power supply state and the power on/off key is triggered, the second pin outputs a low potential as a power off trigger signal to the signal conversion unit.
Preferably, the signal conversion unit comprises a fourth resistor, a sixth resistor and a micro control unit, a first end of the fourth resistor is connected with a system voltage end, a second end of the fourth resistor is connected with a signal input end of the micro control unit, a signal output end of the micro control unit is connected with a first end of the sixth resistor, a second end of the sixth resistor is connected with the system voltage end, and the micro control unit is further connected to a second pin of the key detection unit and the power supply self-locking unit; when the circuit to be powered receives the power supply current, a system voltage end outputs power supply voltage to the micro control unit, the micro control unit is input with the power supply voltage, and high level is output to the power supply self-locking unit to serve as a power supply self-locking signal;
and when the micro control unit is input with a low level, the micro control unit outputs the low level to the power supply self-locking unit as a self-locking release signal.
Preferably, the power supply self-locking unit comprises a signal receiving subunit, a charging and discharging subunit, a switch subunit and a power supply subunit; wherein the content of the first and second substances,
the controlled end of the signal receiving subunit is connected with the output end of the micro control unit, and the output end of the signal receiving subunit is connected with the input end of the charge-discharge electronic unit; the signal receiving subunit receives the high level output by the micro control unit, outputs the high level to the charge and discharge electronic unit, and charges the charge and discharge electronic unit; the output end of the charge-discharge electronic unit is connected with the input end of the switch subunit; the control end of the switch subunit is connected with the controlled end of the power supply follow current switch, and the output end of the power supply electronic unit is connected with the controlled end of the power supply follow current switch; the charging and discharging electronic unit triggers the switch subunit to be conducted when charging is saturated, and the switch subunit outputs a low level to the power supply follow current switch to serve as a power supply trigger signal when being conducted.
Preferably, the signal receiving subunit includes a second diode, the charge-discharge electronic unit includes a third resistor, a second resistor and a second capacitor, and the switch subunit includes a triode; wherein the content of the first and second substances,
a second pin of the second diode is a controlled end of the signal receiving subunit, the second pin receives a high level output by the micro control unit, a second end of the third resistor is connected with a third pin of the second diode, and the third pin outputs the high level to the second end of the third resistor;
the first end of the third resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the second end of the second capacitor, the first end of the second resistor is connected with the first end of the second capacitor, the first end of the second capacitor is connected with the base electrode of the triode, the second end of the second capacitor is connected with the emitting electrode of the triode, and the emitting electrode of the triode is grounded; the second capacitor receives the high level output by the first end of the third resistor and stores the high level to enable the triode to be triggered and conducted;
and the collector of the triode is connected with the controlled end of the power supply follow current switch, and the triode transmits a low level to the power supply follow current switch to be used as a power supply trigger signal when being conducted.
Preferably, the second pin of the second diode is further configured to receive a low level output by the micro control unit and output the low level to the second end of the third resistor;
the second capacitor receives the low level output by the first end of the third resistor, and the second capacitor discharges to cut off the triode;
the collector of the triode is also connected with the power supply electronic unit, and the power supply electronic unit comprises a first resistor and a power supply voltage end; the second end of the first resistor is connected with the collector of the triode, and the first end of the first resistor is connected with the power supply voltage end;
when the triode is cut off, the power supply voltage end sends a high level to the power supply follow current switch through the first resistor to serve as a power supply cut-off signal, and when the power supply follow current switch receives the power supply cut-off signal, a path between a power supply and a circuit to be supplied with power is cut off.
Preferably, the light touch key power supply circuit further comprises an adapter power supply unit, an output end of the adapter power supply unit is connected with an input end of the power supply self-locking unit, and an input end of the adapter power supply unit is connected with an adapter voltage end;
the adapter power supply unit is used for sending an adapter power supply signal to the power supply self-locking unit when the adapter is connected;
the power supply self-locking unit is also used for receiving the adapter power supply signal, converting the adapter power supply signal into a power supply trigger signal and sending the power supply trigger signal to the power supply follow current switch;
and the power supply follow current switch is also used for conducting a path between the adapter and the circuit to be powered when the power supply trigger signal is received.
Preferably, the adapter power supply unit includes a fifth resistor and an adapter voltage terminal, a first terminal of the fifth resistor is connected to the second pin of the second diode, a second terminal of the fifth resistor is connected to the adapter voltage terminal, and the adapter voltage terminal outputs a high level to the second pin through the fifth resistor as an adapter power supply signal when the adapter is connected.
In addition, in order to achieve the above object, the present invention further provides an electronic device, which includes the tact key power supply circuit as described above.
The utility model provides a dab button supply circuit, dab button supply circuit includes: the key detection unit, the power supply self-locking unit, the signal conversion unit and the power supply follow current switch; the detection end of the key detection unit is connected with the output end of the on-off key; the second output end of the key detection unit is connected with the input end of the signal conversion unit; the output end of the signal conversion unit is connected with the controlled end of the power supply self-locking unit; the first output end of the key detection unit is connected with the controlled end of the power supply follow current switch, and the output end of the power supply self-locking unit is connected with the controlled end of the power supply follow current switch; the key detection unit is used for sending a power supply trigger signal to the power supply follow current switch when the power on/off key is triggered and the circuit to be powered is in a state to be powered; the signal conversion unit is used for continuously sending a power supply self-locking signal to the power supply self-locking unit when the circuit to be powered receives the power supply current transmitted by the power supply freewheeling switch; the power supply self-locking unit is used for receiving the power supply self-locking signal, converting the power supply self-locking signal into a power supply trigger signal and continuously outputting the power supply trigger signal to the power supply follow current switch; and the power supply follow current switch is used for conducting a path between a power supply and a circuit to be supplied with power when the power supply trigger signal is received. The circuit realizes the touch on-off of the circuit to be powered when an internal power supply supplies power, has simple circuit, low wiring difficulty and high system response speed, is favorable for reducing the occupied space of the on-off circuit, has more flexible product design, can realize intelligent power supply of the product and effectively improves the user experience; under the condition of shutdown and power failure of the battery product, the storage time of the product is effectively prolonged, and the battery is effectively protected from irreversible damage caused by long-term undervoltage of overdischarge.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the power supply circuit for a touch key of the present invention;
fig. 2 is a schematic circuit diagram of a first embodiment of the power supply circuit for the touch key of the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of the touch key power supply circuit of the present invention;
fig. 4 is a schematic circuit diagram of a second embodiment of the touch key power supply circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| D1～D2 | First to second bipolar tubes | VA | Adapter voltage terminal | |
| C1～C2 | First to second capacitors | V | Supply voltage terminal | |
| | Triode transistor | 100 | Key detection unit | |
| R1～R6 | First to |
200 | Power supply follow current switch | |
| | Grounding terminal | 300 | Signal conversion unit | |
| VS | |
400 | Power supply self-locking unit | |
| KEY | Startup and |
500 | |
|
| 401 | |
402 | Charging and discharging |
|
| 403 | |
404 | Power supply electronic unit | |
| MCU | Micro control unit |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a first embodiment of a power supply circuit for a touch key of the present invention; fig. 2 is a schematic circuit diagram of a first embodiment of the power supply circuit for the touch key of the present invention;
the utility model relates to a dab button supply circuit, dab button supply circuit includes: the key detection unit 100, the power supply self-locking unit 400, the signal conversion unit 300 and the power supply freewheeling switch 200.
The detection end of the KEY detection unit 100 is connected with the output end of the power-on/off KEY KEY; the controlled end of the power supply freewheeling switch 200, the output end of the power supply self-locking unit 400 and the first output end of the key detection unit 100 are connected; a second output end of the key detection unit 100 is connected with an input end of the signal conversion unit 300; the output end of the signal conversion unit 300 is connected with the controlled end of the power supply self-locking unit 400.
It should be understood that a tap is a short duration action. The utility model discloses a dab the button power supply, dab the button and make switch on & off button and its back end circuit short-term contact, thereby pass through short-term contact makes the feed end and treats that the passageway between the supply circuit briefly switches on, forms the power supply self-locking mode fast at the in-process that briefly switches on, makes briefly switch on and convert and continuously switches on, realizes treat supply circuit's last electricity start.
The KEY detection unit 100 is configured to send a power supply trigger signal to the power supply freewheeling switch 200 when the power on/off KEY is triggered and the circuit to be powered is in a state to be powered;
the KEY detecting unit 100 includes a first diode D1, a first pin of the first diode D1 is connected to the controlled terminal of the power supply freewheeling switch 200, a second pin of the first diode D1 is connected to the input terminal of the signal converting unit 300, and a third pin of the first diode D1 is connected to the output terminal of the power on/off KEY. The first pin and the second pin of the bipolar tube are anodes of the bipolar tube, and the third pin of the bipolar tube is a cathode of the bipolar tube. The first pin of the first diode D1 is the first output terminal of the key detect unit 100, the second pin of the first diode D1 is the second output terminal of the key detect unit 100, and the third pin of the first diode D1 is the detect terminal of the key detect unit 100.
It should be noted that the power supply voltage terminal V provides a high level, and when the circuit to be powered is not powered and the on/off KEY is triggered, the on/off KEY is in contact with the third pin of the first diode D1, so that the third pin becomes a ground terminal. The diode of the first pin of the first diode D1 and the supply voltage terminal V form a ground loop, the controlled terminal of the power supply freewheeling switch 200 is at the level of the tube voltage drop of the diode of the first pin of the first diode D1, the tube voltage drops of the two diodes included in the diode are equal, and the tube voltage drop of the diode is 0.3V in this embodiment.
It is easy to understand that when the on/off KEY is not lightly pressed to trigger and the circuit to be powered is not powered, the controlled terminal of the power supply freewheeling switch 200 is at a high level due to the action of the power supply voltage terminal V, and when the controlled terminal is pressed, the high level is reduced to a low level of 0.3V due to the formation of the ground loop, so as to trigger the power supply freewheeling switch 200 to be turned on. Since the on/off KEY is only touched, the on state is only conducted for a short time.
The power supply freewheeling switch 200 is configured to, when receiving the power supply trigger signal, turn on a path between a power supply and a circuit to be powered or a load (not shown) to enable the power supply to output a power supply current to the circuit to be powered or the load.
It should be noted that the power supply freewheeling switch 200 is a P-MOS power supply freewheeling switch in this embodiment, and when the controlled terminal of the P-MOS power supply freewheeling switch receives a low level, the P-MOS power supply freewheeling switch is turned on. For example, before the key is pressed, the controlled terminal is at a high level, the P-MOS power supply freewheeling switch is turned off, and when the key is pressed, the controlled terminal is pulled down to 0.3V, and the P-MOS power supply freewheeling switch is turned on. The power supply may be a built-in battery of the electronic device, a power panel of the electronic device, and the like, one end of the power supply is connected to the power supply voltage end V, and an output end of the power supply is connected to the circuit to be powered.
The signal conversion unit 300 is configured to continuously send a power supply self-locking signal to the power supply self-locking unit 400 when the circuit to be powered receives a power supply current;
it should be noted that the signal conversion unit 300 includes a fourth resistor R4, a sixth resistor R6 and a MCU, a first end of the fourth resistor R4 is connected to the system voltage end VS, a second end of the fourth resistor R4 is connected to a signal input end of the MCU, a signal output end of the MCU is connected to a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is connected to the system voltage end VA.
It should be noted that the system voltage end VS converts the power supply voltage into the voltage input to the signal conversion unit 300 after the circuit to be powered receives the power supply current. That is, the system voltage VS is applied only after the circuit to be powered receives the supply current.
The power supply self-locking unit 400 is configured to receive the power supply self-locking signal, convert the power supply self-locking signal into a power supply trigger signal, and continuously output the power supply trigger signal to the power supply freewheeling switch 200, so that the power supply freewheeling switch 200 is continuously turned on.
The power supply self-locking unit 400 comprises a signal receiving subunit 401, a charging and discharging subunit 402, a switch subunit 403 and a power supply unit; the controlled end of the signal receiving subunit 401 is connected to the output end of the signal conversion unit 300, the output end of the signal receiving subunit 401 is connected to the input end of the charge and discharge electronic unit 402, and the output end of the charge and discharge electronic unit 402 is connected to the input end of the switch subunit 403; the control end of the switch subunit 403 is connected to the controlled end of the power supply freewheeling switch 200, and the output end of the power supply electronic unit 404 is connected to the controlled end of the power supply freewheeling switch 200.
The signal receiving subunit 401 includes a second diode D2, a second pin of the second diode D2 is used for connecting with the output terminal of the adapter power supply unit, a first pin of the second diode D2 is connected with the output terminal of the signal conversion unit 300, and a third pin of the second diode D2 is connected with the input terminal of the power supply self-locking unit 400.
The charge and discharge electronic unit 402 comprises a third resistor R3, a second resistor R2 and a second capacitor C2; a second terminal of the third resistor R3 is connected to the third pin of the second diode D2, a first terminal of the third resistor R3 is connected to a first terminal of the second resistor R2, a second terminal of the second resistor R2 is connected to a second terminal of the second capacitor C2, and a first terminal of the second capacitor C2 is connected to a first terminal of the second resistor R2 and the input terminal of the switch subunit 403.
The switch subunit 403 includes a transistor Q1 and a first capacitor C1, a first end of the first capacitor C1 is connected to the controlled end of the power supply freewheeling switch 200, a base of the transistor Q1 is connected to a first end of the second capacitor C2, an emitter of the transistor Q1 is connected to a ground terminal GND and a second end of the first capacitor C1, and a collector of the transistor Q1 is connected to the controlled end of the power supply freewheeling switch 200.
The power supply electronic unit 404 includes a first resistor R1, a first end of the first resistor R1 is connected to the power supply terminal V, and a second end of the first resistor R1 is connected to the controlled terminal of the power supply freewheeling switch 200.
It should be noted that the power supply electronic unit 404 is configured to receive a voltage from the power supply terminal vin and provide a high level for the controlled terminal of the power supply freewheeling switch 200. From the above, when the power on/off KEY is touched lightly, the level of the controlled terminal of the power supply freewheeling switch is pulled down to the tube voltage drop of the diode. The power supply follow current switch 200 is turned on, but the on time caused by the light touch is not long, and the power supply follow current switch needs to be turned on for a long time to power on the circuit to be powered. The first capacitor C1 plays a role in charging and discharging, and delays the level change of the controlled terminal of the power supply freewheeling switch 200.
It is easy to understand that when the circuit to be powered receives the supply current, the micro control unit MCU in the signal conversion unit 300 receives the system voltage output from the system voltage terminal VS, and therefore can send a high level, i.e. a power supply self-locking signal, to the first pin of the second diode D2. After receiving the high level, the third resistor R3 and the second resistor R2 in the charge and discharge electronic unit 402 divide the voltage to charge the second capacitor C2. As the second capacitor C2 is charged, the voltage across the second capacitor C2 gradually reaches the turn-on voltage of the transistor Q1. The transistor Q1 is turned on, the emitter of the transistor Q1 is grounded, at this time, the first resistor R1 in the power supply subunit 404, the power supply voltage terminal V, and the transistor Q1 in the switch subunit 403 form a ground loop, at this time, the controlled terminal of the power supply freewheeling switch 200 is pulled down to a low level, and in the case of the low level, the power supply freewheeling switch 200 will remain on.
It should be understood that when the power supply freewheeling switch 200 is turned on, the circuit to be powered continuously receives the power supply current and continuously outputs the voltage to the MCU, the MCU can continuously apply a high-level signal, i.e., the power supply self-locking signal, to the first pin of the second diode D2, the second capacitor C2 is continuously charged, and the transistor Q1 is continuously turned on to form the self-mode locking mode. And the conduction of the triode Q1 forms the controlled end of the power supply freewheeling switch 200 to keep low level, and the power supply freewheeling switch 200 is continuously conducted, so that the startup of the circuit to be powered after power-on is completed.
A second pin of the first diode D1 in the KEY detection unit 100 is connected to an input end of the signal conversion unit 300, and when the circuit to be powered is in a power supply state and the power on/off KEY is triggered, the second pin outputs a low potential as a power off trigger signal to the signal conversion unit 300. The MCU in the signal conversion unit 300 receives the shutdown trigger signal and outputs a low level to the power supply self-locking unit 400, where the low level is a self-locking release signal.
It should be noted that, when the circuit to be powered is in a power supply state, the power on/off KEY is pressed, which represents that a user has an intention to power off, at this time, the power on/off KEY and the third pin of the first diode D1 are in short-term contact to form a short-term ground loop, and at this time, the diode corresponding to the second pin of the first diode D1 and the fourth resistor R4 form a ground loop. The first end of the fourth resistor R4 is connected with a system voltage end VS for receiving a system voltage, the second end of the fourth resistor R4 is connected with the input end of the micro control unit MCU and pulled down to a diode tube voltage drop of 0.3V, and the micro control unit MCU receives the low level, namely a shutdown trigger signal.
The power supply self-locking unit 400 is further configured to receive the self-locking release signal, and stop outputting a power supply trigger signal to the power supply freewheeling switch 200 according to the self-locking release signal;
the power supply freewheeling switch 200 is further configured to disconnect a path between the power supply and a circuit to be powered when the power supply trigger signal is not received.
It will be appreciated that the shutdown trigger signal is converted to a latching contact signal, which is low and is sent to the first pin of the second diode D2. After receiving the low level, the charge and discharge electronic unit 402 changes from a charge state to a discharge state, the voltage across the second capacitor C2 gradually decreases, the conduction voltage of the triode Q1 cannot be reached, the triode Q1 is cut off, an underground loop cannot be formed, the level of the controlled end of the power supply freewheeling switch 200 recovers to a high level, the power supply freewheeling switch 200 is turned off, the path between the circuit to be supplied with power and the power supply is turned off, and power supply is stopped. The process realizes the startup and shutdown of the circuit to be powered when the power supply supplies power to the circuit to be powered.
The first embodiment of the utility model realizes the touch on/off of the circuit to be powered when the internal power supply supplies power through the circuit, the circuit is simple, the wiring difficulty is low, the system reaction speed is fast, the occupied space of the on/off circuit is favorably reduced, the product design is more flexible, meanwhile, the product can realize intelligent power supply, and the user experience is effectively improved; under the condition of shutdown and power failure of the battery product, the storage time of the product is effectively prolonged, and the battery is effectively protected from irreversible damage caused by long-term undervoltage of overdischarge.
Based on the first embodiment of the light-touch key power supply circuit of the utility model, the second embodiment of the light-touch key power supply circuit of the utility model is provided, refer to fig. 3 and fig. 4, and fig. 3 is a schematic structural diagram of the second embodiment of the light-touch key power supply circuit of the utility model; fig. 4 is a schematic circuit diagram of a second embodiment of the touch key power supply circuit of the present invention.
The touch key power supply circuit further comprises an adapter power supply unit 500, the output end of the adapter power supply unit 500 is connected with the input end of the power supply self-locking unit 400, and the input end of the adapter power supply unit 500 is connected with an adapter voltage end VA. Adapter voltage end VA be used for to power supply auto-lock unit 400 output high level, in the concrete implementation adapter lug connection adapter voltage end VA, or not lug connection adapter voltage end VA, the utility model discloses it is not right the restriction is done to the concrete connection of adapter, as long as apply the adapter voltage can realize the utility model aims at.
The adapter power supply unit 500 comprises a fifth resistor R5, wherein a first terminal of the fifth resistor R5 and a second pin of the second diode D2 are connected to a second terminal of the fifth resistor R5 and an adapter voltage terminal VA.
The adapter power supply unit 500 is configured to send a high level as an adapter power supply signal to the power supply self-locking unit 400 when an adapter is connected;
the power supply self-locking unit 400 is further configured to receive the adapter power supply signal, convert the adapter power supply signal into a power supply trigger signal, and send the power supply trigger signal to the power supply freewheeling switch 200;
in the adapter power supply unit 500, when the adapter is connected, the fifth resistor R5 divides the voltage, so that the adapter inputs a high level to the second pin of the second diode D2 and inputs the high level to the charge and discharge unit 402. Based on the first embodiment, when the charge and discharge electronic unit 402 is charged, the voltage across the second capacitor C2 rises, so that the transistor Q1 is turned on, the transistor Q1 and the first resistor R1 form a ground loop, the voltage at the controlled terminal of the power supply freewheeling switch 200 is pulled low, the controlled terminal of the power supply freewheeling switch 200 receives a low level, and the power supply freewheeling switch 200 is turned on.
The power supply freewheeling switch 200 is further configured to receive the power supply trigger signal and turn on a path between the adapter and a circuit to be powered, so that the adapter outputs a power supply current to the circuit to be powered.
The signal conversion unit 300 is configured to continuously send a power supply self-locking signal to the power supply self-locking unit 400 when the circuit to be powered receives the power supply current output by the adapter;
the power supply self-locking unit 400 is configured to receive the power supply self-locking signal, convert the power supply self-locking signal into a power supply trigger signal, and continuously send the power supply trigger signal to the power supply freewheeling switch 200, so that the power supply freewheeling switch 200 is continuously turned on.
It is easy to understand that, based on the principle of the first embodiment, when the circuit to be powered receives the power supply current, the voltage is applied to the system voltage terminal VS, and the micro control unit MCU receives the high level and continuously outputs the high level as the power supply self-locking signal to the power supply self-locking unit 400. The power supply self-locking unit 400 receives a power supply self-locking signal, so that the charge and discharge electronic unit 402 is continuously charged, the voltages at the two ends of the second capacitor C2 are continuously kept at the conduction voltage of the triode Q1, the triode Q1 is continuously conducted, the controlled end of the power supply freewheeling switch 200 is continuously at a low level, the power supply freewheeling switch 200 is continuously conducted, the adapter and the circuit of the circuit to be powered are continuously conducted, power is continuously supplied to the circuit to be powered, a cycle is formed, and the self-locking power supply unit 400 forms a self-locking power supply mode.
The KEY detection unit 200 is further configured to send a standby trigger signal to the signal conversion unit 300 when the adapter is accessed and the on/off KEY is detected to be triggered;
the signal conversion unit 300 is further configured to receive the standby trigger signal and send a standby signal to the circuit to be powered, so that the circuit to be powered enters a standby state.
It should be noted that, when the adapter is connected, the internal power supply may be in a shutdown state or a startup state, and when the adapter is connected, the adapter may continuously supply power to the circuit to be powered. When the adapter is connected, the power on/off KEY is pressed, based on the first embodiment, the voltage at the input end of the micro control unit MCU may become a diode voltage drop, and the micro control unit MCU receives a low level and transmits a standby signal to the circuit to be powered, and when the circuit to be powered enters a standby state.
It should be noted that, in a standby state, if the adapter is unplugged and the internal power supply is not supplying power, the MCU detects that the circuit to be powered no longer receives the power supply circuit output by the adapter, and sends a shutdown signal to the circuit to be powered. Based on the first embodiment, at this time, the MCU sends a low level, i.e., a self-locking release signal, to the first pin of the second diode D2, the second capacitor C2 enters a discharging mode, the voltage across the second capacitor C2 is lower than the on-state voltage of the transistor Q1, the transistor Q1 is turned off, the ground loop is broken, and the power supply freewheeling switch 200 is turned off. When the circuit finishes the power supply of the adapter, the circuit to be powered on, standby and power off.
The first embodiment of the utility model realizes the touch startup, shutdown and standby of the power supply circuit to be waited when the adapter supplies power through the circuit, the circuit is simple, the wiring difficulty is low, the system reaction speed is fast, the occupied space of the startup and shutdown circuit is favorably reduced, the product design is more flexible, meanwhile, the product can realize intelligent power supply, and the user experience is effectively improved; under the condition of shutdown and power failure of the battery product, the storage time of the product is effectively prolonged, and the battery is effectively protected from irreversible damage caused by long-term undervoltage of overdischarge.
In addition, in order to achieve the above object, the present invention further provides an electronic device, which includes the tact key power supply circuit as described above.
It is easy to understand that the light touch key may be a switch key of a device such as a mobile phone or a notebook computer, or may be a key on a touch panel of a device such as a household appliance or a sound box.
It should be noted that the electronic device may be a portable electronic product with a battery for supplying power, such as: mobile terminals, notebook computers, tablet computers, and the like; the electronic equipment can also be provided with three power supply modes, namely power supply by a power panel, power supply by a built-in battery and power supply by an external power supply, such as a Bluetooth sound box, household appliances and the like.
Since the electronic device adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in the specific application, those skilled in the art can set the solution as required, and the present invention is not limited thereto.
It should be noted that the above-described work flow is only illustrative, and does not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to practical needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment can be referred to the power supply circuit for the touch key provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A light touch key power supply circuit is characterized by comprising: the key detection unit, the power supply self-locking unit, the signal conversion unit and the power supply follow current switch; wherein the content of the first and second substances,
the detection end of the key detection unit is connected with the output end of the on-off key; the second output end of the key detection unit is connected with the input end of the signal conversion unit; the output end of the signal conversion unit is connected with the controlled end of the power supply self-locking unit; the first output end of the key detection unit is connected with the output end of the power supply self-locking unit and the controlled end of the power supply follow current switch;
the key detection unit is used for sending a power supply trigger signal to the power supply follow current switch when the power on/off key is triggered and the circuit to be powered is in a state to be powered;
the signal conversion unit is used for continuously sending a power supply self-locking signal to the power supply self-locking unit when the circuit to be powered receives the power supply current transmitted by the power supply freewheeling switch;
the power supply self-locking unit is used for receiving the power supply self-locking signal, converting the power supply self-locking signal into a power supply trigger signal and continuously outputting the power supply trigger signal to the power supply follow current switch;
and the power supply follow current switch is used for conducting a path between a power supply and a circuit to be supplied with power when the power supply trigger signal is received.
2. The power supply circuit for a touch key of claim 1, wherein the key detection unit comprises a first diode, a first pin of the first diode is connected with a controlled end of the power supply freewheeling switch, a third pin of the first diode is connected with an output end of the power on/off key, and when the power on/off key is triggered, the first pin outputs a low potential as the power supply triggering signal to the power supply freewheeling switch.
3. The power supply circuit for a touch key of claim 2, wherein a second pin of the first diode is connected to the input terminal of the signal conversion unit, and when the power supply circuit is in a power supply state and the power on/off key is triggered, the second pin outputs a low potential as a power off trigger signal to the signal conversion unit.
4. The light touch key power supply circuit according to claim 3, wherein the signal conversion unit comprises a fourth resistor, a sixth resistor and a micro control unit, a first end of the fourth resistor is connected with a system voltage end, a second end of the fourth resistor is connected with a signal input end of the micro control unit, a signal output end of the micro control unit is connected with a first end of the sixth resistor, a second end of the sixth resistor is connected with the system voltage end, and the micro control unit is further connected to a second pin of the key detection unit and the power supply self-locking unit.
5. The light-touch key power supply circuit of claim 4, wherein the power supply self-locking unit comprises a signal receiving subunit, a charging and discharging subunit, a switch subunit and a power supply subunit; wherein the content of the first and second substances,
the controlled end of the signal receiving subunit is connected with the output end of the micro control unit, and the output end of the signal receiving subunit is connected with the input end of the charge-discharge electronic unit; the output end of the charge-discharge electronic unit is connected with the input end of the switch subunit; the control end of the switch subunit is connected with the controlled end of the power supply follow current switch, and the output end of the power supply electronic unit is connected with the controlled end of the power supply follow current switch.
6. The light-touch key power supply circuit of claim 5, wherein the signal receiving subunit comprises a second diode, the charge-discharge electronic unit comprises a third resistor, a second resistor and a second capacitor, and the switch subunit comprises a triode; wherein the content of the first and second substances,
a second pin of the second diode is a controlled end of the signal receiving subunit, the second pin receives a high level output by the micro control unit, a second end of the third resistor is connected with a third pin of the second diode, and the third pin outputs the high level to the second end of the third resistor;
the first end of the third resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the second end of the second capacitor, the first end of the second resistor is connected with the first end of the second capacitor, the first end of the second capacitor is connected with the base electrode of the triode, the second end of the second capacitor is connected with the emitting electrode of the triode, and the emitting electrode of the triode is grounded; the second capacitor receives the high level output by the first end of the third resistor and stores the high level to enable the triode to be triggered and conducted;
and the collector of the triode is connected with the controlled end of the power supply follow current switch, and the triode transmits a low level to the power supply follow current switch to be used as a power supply trigger signal when being conducted.
7. The light-touch key power supply circuit of claim 6, wherein the second pin of the second diode is further configured to receive a low level output by the micro control unit and output the low level to the second end of the third resistor;
the second capacitor receives the low level output by the first end of the third resistor, and the second capacitor discharges to cut off the triode;
the collector of the triode is also connected with the power supply electronic unit, and the power supply electronic unit comprises a first resistor and a power supply voltage end; the second end of the first resistor is connected with the collector of the triode, and the first end of the first resistor is connected with the power supply voltage end;
when the triode is cut off, the power supply voltage end sends a high level to the power supply follow current switch through the first resistor to serve as a power supply cut-off signal, and when the power supply follow current switch receives the power supply cut-off signal, a path between a power supply and a circuit to be supplied with power is cut off.
8. The touch key power supply circuit according to claim 7, wherein the touch key power supply circuit further comprises an adapter power supply unit, an output end of the adapter power supply unit is connected with an input end of the power supply self-locking unit, and an input end of the adapter power supply unit is connected with an adapter voltage end;
the adapter power supply unit is used for sending an adapter power supply signal to the power supply self-locking unit when the adapter is connected;
the power supply self-locking unit is also used for receiving the adapter power supply signal, converting the adapter power supply signal into a power supply trigger signal and sending the power supply trigger signal to the power supply follow current switch;
and the power supply follow current switch is also used for conducting a path between the adapter and the circuit to be powered when the power supply trigger signal is received.
9. The light touch key power supply circuit of claim 8, wherein the adapter power supply unit comprises a fifth resistor and an adapter voltage terminal, a first terminal of the fifth resistor is connected to the second pin of the second diode, a second terminal of the fifth resistor is connected to the adapter voltage terminal, and the adapter voltage terminal outputs a high level to the second pin through the fifth resistor as the adapter power supply signal when the adapter is connected.
10. An electronic device, characterized in that the electronic device comprises the power supply circuit for the tact key according to any one of claims 1 to 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922498444 | 2019-12-31 | ||
| CN2019224984443 | 2019-12-31 |
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| CN211830739U true CN211830739U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020764366.7U Active CN211830739U (en) | 2019-12-31 | 2020-05-09 | Light touch key power supply circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023279288A1 (en) * | 2021-07-07 | 2023-01-12 | 东莞新能安科技有限公司 | Key circuit, control method, battery management system, and power consuming apparatus |
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- 2020-05-09 CN CN202020764366.7U patent/CN211830739U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023279288A1 (en) * | 2021-07-07 | 2023-01-12 | 东莞新能安科技有限公司 | Key circuit, control method, battery management system, and power consuming apparatus |
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