CN217522820U - One-key switching circuit and electronic equipment - Google Patents
One-key switching circuit and electronic equipment Download PDFInfo
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- CN217522820U CN217522820U CN202220834179.0U CN202220834179U CN217522820U CN 217522820 U CN217522820 U CN 217522820U CN 202220834179 U CN202220834179 U CN 202220834179U CN 217522820 U CN217522820 U CN 217522820U
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Abstract
The utility model is suitable for an electronic equipment technical field provides a key switching on and shutting down circuit and electronic equipment, and a key switching on and shutting down circuit includes: the circuit comprises a key, a capacitor, a first resistor, a first switch module, a second switch module and a third switch module; the first end of the key is electrically connected with the key detection end and the first end of the capacitor respectively, and the second end of the key is electrically connected with the grounding end; the second end of the capacitor is electrically connected with the first end of the first resistor, the first switch module and the third switch module respectively; the second end of the first resistor is electrically connected with a first power supply end; the first switch module is also electrically connected with the first power supply and the second switch module respectively; the second switch module is also electrically connected with the grounding terminal and the second power supply terminal respectively; the third switch module is also electrically connected with the grounding end and the control end respectively, and the control end is electrically connected with the control module; the key detection end is electrically connected with a first power supply; the first power terminal is electrically connected to a power supply. The utility model discloses control cost and volume.
Description
Technical Field
The utility model belongs to the technical field of electronic equipment, especially, relate to a key switch circuit and electronic equipment.
Background
At present, the existing common electronic equipment adopts an independent self-locking key to carry out on-off operation on the equipment, but the volume occupied by the independent self-locking key cannot meet the volume requirements of some electronic products with higher volume requirements, and other key functions (such as an automatic on-off function) are required to be realized, and a key needs to be additionally installed, so that the application is very complex and the occupied volume is large; in the existing electronic equipment, a chip special for one-key startup and shutdown is also partially adopted to replace an independent self-locking key, but the chip has high cost.
SUMMERY OF THE UTILITY MODEL
The utility model provides a key switching on and shutting down circuit aims at solving the problem that the existing circuit of going occupies bulky while with high costs.
The utility model discloses a realize like this, provide a key switching on and shutting down circuit, a key switching on and shutting down circuit includes: the circuit comprises a key, a capacitor, a first resistor, a first switch module, a second switch module and a third switch module;
the first end of the key is electrically connected with the key detection end and the first end of the capacitor respectively, and the second end of the key is electrically connected with the grounding end;
the second end of the capacitor is electrically connected with the first end of the first resistor, the first switch module and the third switch module respectively;
the second end of the first resistor is electrically connected with a first power supply end;
the first switch module is also electrically connected with the first power supply and the second switch module respectively;
the second switch module is also electrically connected with a grounding terminal and a second power supply terminal respectively;
the third switch module is also respectively electrically connected with a grounding end and a control end, and the control end is electrically connected with the control module;
the key detection end is electrically connected with the first power supply;
the first power end is electrically connected with a power supply.
Furthermore, the power supply device further comprises a power supply interface, wherein the power supply interface is electrically connected with the first power supply end and the grounding end respectively.
Furthermore, the first switch module comprises a first MOS tube and a first diode connected with the first MOS tube in an anti-parallel mode;
the grid electrode of the first MOS tube is electrically connected with the first end of the first resistor, the second end of the capacitor and the third switch module respectively;
the source electrode of the first MOS tube is electrically connected with the first power supply end, the power supply interface and the cathode of the first diode tube respectively;
the drain electrode of the first MOS tube is electrically connected with the anode of the first diode.
Furthermore, the second switch module comprises a second MOS transistor and a second diode connected in anti-parallel with the second MOS transistor;
the grid electrode of the second MOS tube is electrically connected with a grounding end, and the drain electrode of the second MOS tube is respectively electrically connected with the drain electrode of the first MOS tube and the anode of the second diode;
and the source electrode of the second MOS tube is respectively and electrically connected with the cathode of the second diode and the second power supply end.
Furthermore, the second switch module further includes a second resistor, a first end of the second resistor is electrically connected to the source of the second MOS transistor and the second power supply terminal, respectively, and a second end of the second resistor is electrically connected to a ground terminal.
Furthermore, the second MOS transistor is a PMOS transistor.
Furthermore, the third switch module comprises a triode, a collector of the triode is electrically connected with the first end of the first resistor, the gate of the first MOS transistor and the second end of the capacitor, a base of the triode is electrically connected with the control end, and an emitter of the triode is electrically connected with the ground terminal.
Furthermore, the third switch module further comprises a third resistor and a fourth resistor, the first end of the third resistor is electrically connected to the control terminal, the second end of the third resistor is electrically connected to the first end of the fourth resistor and the base of the triode, respectively, and the second end of the fourth resistor is electrically connected to the ground terminal.
Furthermore, the touch control device further comprises a fifth resistor, wherein a first end of the fifth resistor is electrically connected with the key detection end, and a second end of the fifth resistor is electrically connected with the first power end and a second end of the first resistor respectively.
An embodiment of the utility model provides an electronic equipment is still provided, include: the one-key switch circuit described in the above embodiments.
The utility model discloses the beneficial effect who reaches: the utility model discloses owing to utilize the characteristic of electric capacity to control switching on or closing of first switch module, second switch module and third switch control module, realize a pulse key switching on and shutting down. The constructed circuit is simple and reliable, the required elements are fewer, the functional integrity and stability are ensured, and meanwhile, the low power consumption of the circuit is realized, and the cost and the volume of the circuit are controlled. The control logic of the circuit is simple, the charging characteristic of the capacitor is utilized, the pulse startup and shutdown is realized, meanwhile, the automatic disconnection of the power supply when the key is pressed for a long time accidentally is realized, the power supply is prevented from being short-circuited, the key can be automatically switched on and off, and more application scenes are possessed.
Drawings
Fig. 1 is a schematic circuit structure diagram of a one-key switch circuit according to an embodiment of the present invention.
Wherein, 1, pressing a key; 2. a capacitor; 3 a first resistor; 4. the first switch module 41, the first MOS tube 42 and the first diode; 5. the second switch module 51, a second MOS transistor 52, a second diode 53 and a second resistor; 6. the third switch module 61, the triode 62, the third resistor 63 and the fourth resistor; 7. A fifth resistor; 8. and a power interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. 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 utility model discloses owing to utilize the characteristic of electric capacity to control switching on or closing of first switch module, second switch module and third switch control module, realize a pulse key switching on and shutting down. The built circuit is simple and reliable, the required elements are fewer, the functional integrity and stability are ensured, and meanwhile, the low power consumption of the circuit is realized, and the cost and the volume of the circuit are controlled. The control logic of the circuit is simple, the charging characteristic of the capacitor is utilized, the pulse startup and shutdown is realized, meanwhile, the automatic disconnection of the power supply when the key is pressed for a long time accidentally is realized, the power supply is prevented from being short-circuited, the key can be automatically switched on and off, and more application scenes are possessed.
Example one
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a one-key power on/off circuit provided in an embodiment of the present invention, where the one-key power on/off circuit includes: the switch comprises a key 1, a capacitor 2, a first resistor 3, a first switch module 4, a second switch module 5 and a third switch module 6. The first end of the KEY 1 is electrically connected with the KEY detection end KEY _ TEST and the first end of the capacitor 2, and the second end of the KEY 1 is electrically connected with the ground terminal GND. The second end of the capacitor 2 is electrically connected to the first end of the first resistor 3, the first switch module 4 and the third switch module 6, respectively. The second end of the first resistor 3 is electrically connected to a first power supply terminal BAT. The first switch module 4 is also electrically connected to the first power supply and the second switch module 5, respectively. The second switch module 5 is further electrically connected to a ground GND and a second power terminal VCC _1, respectively. The third switch module 6 is further electrically connected with a ground terminal GND and a control terminal Power _ lock respectively, and the control terminal Power _ lock is electrically connected with the control module. The KEY detection end KEY _ TEST is electrically connected with the first power supply; the first power supply terminal BAT is electrically connected to a power supply 9, and the second power supply terminal VCC _1 is electrically connected to a power supply input terminal of the load.
Specifically, the capacitor 2 is charged by pressing the key 1, so that the first switch module 4 is controlled to be conducted to work, and the second switch module 5 is further controlled to be conducted to work. At this moment, the first Power supply terminal BAT and the second Power supply terminal VCC _1 are switched on, the system normally works, the control module controls the third switch module 6 to be switched on and work through the control terminal Power _ lock, and then controls the first switch module 4 to be switched on and off, so that pulse one-key on-off is realized.
More specifically, a pulse is generated to control the on/off of the first switch module 4 by using the charging characteristic of the capacitor 2, so as to implement the on/off operation, and the time for starting the pulse is determined by the capacitance value of the capacitor 2 and the resistance value of the first resistor 3. Meanwhile, the pulse is adopted, so that the situation that the power supply is automatically cut off when the key 1 is pressed for a long time by accident is avoided, and low power consumption is realized.
It should be noted that, during the power-on process, the KEY detection terminal KEY _ TEST is connected to the KEY 1 detection input port of the CPU of the operating system in which the one-KEY power-on/off circuit is located, and is used to detect whether the KEY 1 is pressed or not, and to customize the short-press and long-press functions of the KEY 1, so that the circuit can be applied to more scenes.
The control end Power _ lock is a control pin connected with an output port of a CPU of a working system where the one-key Power on/off circuit is located, and in the Power-on process, the CPU in the control module controls the on/off of the third switch module 6 through the control end Power _ lock pin, so that the on/off of the first switch module 4 is controlled, and self-locking and self-fixing Power on/off time are realized.
In the embodiment of the present invention, since the first switch module 4, the second switch module 5, and the third switch control module 6 are controlled to be turned on or off by using the characteristics of the capacitor 2, the pulse one-key on/off operation is realized. The built circuit is simple and reliable, the required elements are fewer, the functional integrity and stability are ensured, and meanwhile, the low power consumption of the circuit is realized, and the cost and the volume of the circuit are controlled. The control logic of the circuit is simple, the charging characteristic of the capacitor 2 is utilized, the pulse on-off is realized, meanwhile, the functions of automatically disconnecting the power supply when the key 1 is pressed for a long time by accident, preventing the short circuit of the power supply, automatically setting the key 1 to be switched on and off are realized, and more application scenes are possessed.
The embodiment of the utility model provides an in, still include power source 8, power source 8 respectively with first power end BAT and earthing terminal GND electricity are connected for be connected with external power supply electricity, in order to provide working power supply.
In the embodiment of the present invention, the first switch module 4 includes a first MOS transistor 41 and a first diode 42 connected in anti-parallel with the first MOS transistor 41. The gate of the first MOS transistor 41 is electrically connected to the first end of the first resistor 3, the second end of the capacitor 2, and the third switching module 6, respectively. The source of the first MOS transistor 41 is electrically connected to the first power terminal BAT, the power interface 8, and the cathode of the first diode 42, respectively. The drain of the first MOS transistor 41 is electrically connected to the anode of the first diode 42. Specifically, the first switching module 4 is turned on or off by controlling the first MOS transistor 41 to be turned on or off. The first diode 42 is connected in anti-parallel with the first MOS transistor 41, and is used for protecting the first MOS transistor 41 from being damaged, further protecting the circuit from being damaged, and improving the safety and the service life of the circuit.
In the embodiment of the present invention, the second switch module 5 includes a second MOS transistor 51 and a second diode 52 connected in anti-parallel with the second MOS transistor 51. The gate of the second MOS transistor 51 is electrically connected to a ground GND, and the drain of the second MOS transistor 51 is electrically connected to the drain of the first MOS transistor 41 and the anode of the second diode 52, respectively. The source of the second MOS transistor 51 is electrically connected to the cathode of the second diode 52 and the second power terminal VCC _1, respectively. Specifically, the second switching module 5 is turned on or off by controlling the second MOS transistor 51 to be turned on or off. The second diode 52 is connected in anti-parallel with the second MOS transistor 51, and is used for protecting the second MOS transistor 51 from being damaged, further protecting the circuit from being damaged, and improving the safety and the service life of the circuit.
In the embodiment of the present invention, the second switch module 5 further includes a second resistor 53, a first end of the second resistor 53 is respectively connected to the source of the second MOS transistor 51 and the second power terminal VCC _1, and a second end of the second resistor 53 is electrically connected to the ground terminal GND. Specifically, the second resistor 53 may serve as a bias voltage for the second MOS transistor 51. Meanwhile, the second resistor 53 may also function as a discharge resistor, thereby protecting the gate and the source of the second MOS transistor 51.
The second MOS transistor 51 is a PMOS transistor. By utilizing the characteristics of the PMOS tube, the reverse connection prevention of the power supply is realized, the voltage difference of the power supply is reduced while the circuit is protected, and the low power consumption is realized.
In the embodiment of the present invention, the third switch module 6 includes a triode 61, the collector of the triode 61 respectively with the first end of the first resistor 3, the gate of the first MOS transistor 41 and the second end of the capacitor 2 are electrically connected, the base of the triode 61 with the control end Power _ lock is electrically connected, the emitter of the triode 61 is electrically connected with the ground terminal GND. Specifically, the third switching module 6 is turned on or off by controlling the transistor 61 to be turned on or off. The triode 61 has simple structure, strong stability and low cost, and further does not provide the stability of the circuit and reduces the circuit cost.
In the embodiment of the present invention, the third switch module 6 further includes a third resistor 62 and a fourth resistor 63, the first end of the third resistor 62 is electrically connected to the control terminal Power _ lock, the second end of the third resistor 62 is respectively electrically connected to the first end of the fourth resistor 63 and the base of the transistor 61, and the second end of the fourth resistor 63 is electrically connected to the ground terminal GND. Specifically, the third resistor 62 and the fourth resistor 63 can protect the transistor 61, so as to prolong the service life of the transistor 61 and improve the stability of the circuit, thereby prolonging the service life and improving the stability of the circuit.
In the embodiment of the present invention, the power supply further includes a fifth resistor 7, the first end of the fifth resistor 7 is electrically connected to the KEY detection end KEY _ TEST, and the second end of the fifth resistor 7 is electrically connected to the first power source terminal BAT and the second end of the first resistor 3, respectively. Specifically, the fifth resistor 7 can function as a protection circuit.
Example two
The specific embodiment of the utility model provides an electronic equipment is still provided, and this electronic equipment includes: the one-key switch circuit described in the above embodiments.
The embodiment of the present invention provides a pulse one-key switch-on/off device, which is realized by controlling the on/off of the first switch module, the second switch module and the third switch control module by using the characteristics of the capacitor. The built circuit is simple and reliable, the required elements are fewer, the functional integrity and stability are guaranteed, meanwhile, the low power consumption of the circuit is achieved, the cost and the size of the circuit are controlled, and the cost and the size of electronic equipment are further controlled. The control logic of the circuit is simple, the charging characteristic of the capacitor is utilized, the pulse startup and shutdown is realized, meanwhile, the automatic disconnection of the power supply when the key is pressed for a long time accidentally is realized, the power supply is prevented from being short-circuited, the key can be automatically switched on and off, and more application scenes are possessed.
The terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. 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 application. 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 those skilled in the art that the embodiments described herein can be combined with other embodiments, and that the connections described above refer to electrical connections.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A one-touch power-on/off circuit, comprising: the circuit comprises a key, a capacitor, a first resistor, a first switch module, a second switch module and a third switch module;
the first end of the key is electrically connected with the key detection end and the first end of the capacitor respectively, and the second end of the key is electrically connected with the grounding end;
the second end of the capacitor is electrically connected with the first end of the first resistor, the first switch module and the third switch module respectively;
the second end of the first resistor is electrically connected with a first power supply end;
the first switch module is also electrically connected with the first power supply and the second switch module respectively;
the second switch module is also electrically connected with a grounding terminal and a second power supply terminal respectively;
the third switch module is also electrically connected with a grounding end and a control end respectively, and the control end is electrically connected with the control module;
the key detection end is electrically connected with the first power supply;
the first power end is electrically connected with a power supply.
2. The one-key switch circuit of claim 1, further comprising a power interface electrically connected to the first power terminal and a ground terminal, respectively.
3. The one-key switch circuit of claim 2, wherein the first switch module comprises a first MOS transistor and a first diode connected in anti-parallel with the first MOS transistor;
the grid electrode of the first MOS tube is electrically connected with the first end of the first resistor, the second end of the capacitor and the third switch module respectively;
the source electrode of the first MOS tube is electrically connected with the first power supply end, the power supply interface and the cathode of the first diode tube respectively;
the drain electrode of the first MOS tube is electrically connected with the anode of the first diode.
4. The one-key switching circuit according to claim 3, wherein the second switching module includes a second MOS transistor and a second diode connected in anti-parallel with the second MOS transistor;
the grid electrode of the second MOS tube is electrically connected with a grounding end, and the leakage marks of the second MOS tube are respectively electrically connected with the drain electrode of the first MOS tube and the anode of the second diode;
and the source electrode of the second MOS tube is respectively and electrically connected with the cathode of the second diode and the second power supply end.
5. The one-touch switch circuit of claim 4, wherein the second switch module further comprises a second resistor, a first end of the second resistor is electrically connected to the source of the second MOS transistor and the second power terminal, respectively, and a second end of the second resistor is electrically connected to a ground terminal.
6. The one-key switch circuit according to any one of claims 4 to 5, wherein the second MOS transistor is a PMOS transistor.
7. The one-key switch circuit of claim 3, wherein the third switch module comprises a triode, a collector of the triode is electrically connected to the first terminal of the first resistor, the gate of the first MOS transistor, and the second terminal of the capacitor, respectively, a base of the triode is electrically connected to the control terminal, and an emitter of the triode is electrically connected to a ground terminal.
8. The one-key switch circuit of claim 7, wherein the third switch module further comprises a third resistor and a fourth resistor, a first end of the third resistor is electrically connected to the control terminal, a second end of the third resistor is electrically connected to a first end of the fourth resistor and the base of the triode, respectively, and a second end of the fourth resistor is electrically connected to a ground terminal.
9. The one-key switch circuit according to claim 1, further comprising a fifth resistor, a first end of the fifth resistor being electrically connected to the key detection terminal, and a second end of the fifth resistor being electrically connected to the first power supply terminal and the second end of the first resistor, respectively.
10. An electronic device, comprising: the one-key switch circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220834179.0U CN217522820U (en) | 2022-04-12 | 2022-04-12 | One-key switching circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220834179.0U CN217522820U (en) | 2022-04-12 | 2022-04-12 | One-key switching circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217522820U true CN217522820U (en) | 2022-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220834179.0U Active CN217522820U (en) | 2022-04-12 | 2022-04-12 | One-key switching circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217522820U (en) |
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2022
- 2022-04-12 CN CN202220834179.0U patent/CN217522820U/en active Active
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