CN111694418A - Power switch circuit for electronic product - Google Patents
Power switch circuit for electronic product Download PDFInfo
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- CN111694418A CN111694418A CN202010331905.2A CN202010331905A CN111694418A CN 111694418 A CN111694418 A CN 111694418A CN 202010331905 A CN202010331905 A CN 202010331905A CN 111694418 A CN111694418 A CN 111694418A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
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Abstract
The invention discloses a power switch circuit for electronic products, comprising: the control unit, the switch unit, the power conversion unit and the microswitch are provided with a power switch and a functional key; one end of the microswitch is connected with an input power supply, and the other end of the microswitch is respectively connected with the input end of the power supply conversion unit and the first I/O interface of the control unit; the microswitch is used as a power switch when being pressed for a long time, and is used as a functional key when being clicked; the power supply conversion unit is used for providing working power supply for the control unit; and after the control unit is not electrified and the microswitch is pressed for a long time, the control unit is electrified and outputs a starting-up instruction to the switch unit through the second I/O interface, so that the switch unit locks the input end of the power supply conversion unit to supply power. By using the invention, the power switch on the electronic product has the function of a functional key, and the difficulty in designing the electronic product die and arranging elements is reduced.
Description
Technical Field
The invention relates to the technical field of power switches, in particular to a power switch circuit for an electronic product.
Background
The power switch is used for providing electrical connection from a voltage source or ground to a load, and in the existing electronic product, the power switch mostly uses independent keys, so that when a product mold is designed, the position of the control key is required to be reserved, and the position of one more power switch is required to be arranged, so that the miniaturization difficulty of the electronic product is increased; for products with limited internal space, the difficulty of mold design and element arrangement is undoubtedly increased.
Disclosure of Invention
The invention provides a power switch circuit for an electronic product, which is used for optimizing the design of a power switch on the existing electronic product.
Therefore, the invention provides the following technical scheme:
a power switching circuit for an electronic product, the circuit comprising: the control unit, the switch unit, the power conversion unit and the microswitch are provided with a power switch and a functional key; one end of the microswitch is connected with an input power supply, and the other end of the microswitch is respectively connected with the input end of the power supply conversion unit and the first I/O interface of the control unit; the microswitch is used as a power switch when being pressed for a long time, and the microswitch is used as a function key when being clicked;
the power supply conversion unit is used for providing a working power supply for an active device in the electronic product;
and after the control unit is not powered on and the microswitch is pressed for a long time, the control unit is powered on, and the second I/O interface of the control unit outputs a starting-up instruction to the switch unit, so that the switch unit locks the input end of the power conversion unit to supply power.
Optionally, the circuit further comprises: and the driving unit is arranged between the control unit and the switch unit and is used for driving the switch unit to lock the input end of the power conversion unit for power supply according to the starting instruction.
Optionally, the driving unit is an NPN-type triode, a base of the triode is connected to the second I/O interface of the control unit, and a collector of the triode is connected to the switching unit and is connected to the input power supply through a pull-up resistor; and the emitter of the triode is grounded.
Optionally, the switch unit is a P-channel MOS transistor; the grid electrode of the MOS tube is connected with the collector electrode of the triode, the source electrode of the MOS tube is connected with the input power supply, and the drain electrode of the MOS tube is connected with the input end of the power supply conversion unit.
Optionally, after the microswitch is pressed for a long time during the operation of the control unit, the second I/O interface of the control unit outputs a shutdown instruction to the switch unit, so that the switch unit disconnects the power supply from the input end of the power conversion unit.
Optionally, the control unit is further configured to, when it is detected that there is no user operation within the set time, output a shutdown instruction to the switch unit by the second I/O interface, so that the switch unit disconnects power supply to the input terminal of the power conversion unit.
Optionally, the control unit is a single chip microcomputer, and the starting instruction is a high level signal; the shutdown instruction is a low level signal.
Optionally, the circuit further comprises: a first protection unit disposed between the input power source and the micro switch.
Optionally, the circuit further comprises: and the second protection unit is arranged between the micro switch and the power conversion unit.
Optionally, the circuit further comprises: a third protection unit disposed between the control unit and the driving unit.
The power switch circuit for the electronic product uses the micro switch to enable the micro switch to have a power switch and a function key, wherein one end of the micro switch is connected with an input power supply, and the other end of the micro switch is respectively connected with the input end of the power conversion unit and the first I/O interface of the control unit. After the control unit is not powered on and the microswitch is pressed for a long time, the microswitch is connected with the input power supply and the power supply conversion unit, so that the power supply conversion unit provides working power supply for the control unit; after the control unit is powered on, the control unit outputs a starting-up instruction to the switch unit through the second I/O interface, so that the switch unit locks the input end of the power conversion unit to supply power and further locks the working power supply, the whole system of the electronic product keeps normal power supply, all the function keys can execute corresponding operations, and the microswitch can execute the operations corresponding to the function keys. According to the scheme of the invention, a micro switch is used as a power supply self-locking switch, so that one power supply switch can be reduced, the PCB layout space of a power supply part is reduced, the die design and element arrangement difficulty of an electronic product are reduced, and hardware resources can be effectively saved.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a functional block diagram of a power switching circuit for an electronic product according to the present invention;
FIG. 2 is another functional block diagram of the power switching circuit for an electronic product of the present invention;
fig. 3 is a specific circuit diagram of the power switching circuit for electronic products according to the present invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
The invention provides a power switch circuit for an electronic product, which has the advantages that a microswitch is utilized to have a power switch and a function key, one end of the microswitch is connected with an input power supply, and the other end of the microswitch is respectively connected with the input end of a power conversion unit and a first I/O interface of a control unit. After the control unit is not powered on and the microswitch is pressed for a long time, the microswitch is connected with the input power supply and the power supply conversion unit, so that the power supply conversion unit provides working power supply for the control unit; after the control unit is powered on, the control unit outputs a starting-up instruction to the switch unit through the second I/O interface, so that the switch unit locks the input end of the power conversion unit to supply power, and further locks the working power supply, thereby the whole system of the electronic product keeps normal power supply, all the function keys can execute corresponding operations, and the microswitch can execute the operations corresponding to the function keys.
Fig. 1 is a schematic block diagram of a power switching circuit for an electronic product according to the present invention.
In this embodiment, the circuit includes: a control unit, a switch unit, a power conversion unit, and a microswitch SW3 having both a power switch and a function key; one end of the microswitch SW3 is connected with an input power VBAT +, and the other end of the microswitch SW3 is respectively connected with the input end Vin of the power conversion unit and the first I/O interface of the control unit; the microswitch SW3 is used as a power switch when pressed for a long time, and the microswitch SW3 is used as a function key when clicked.
The power supply conversion unit is used for providing a working power supply for an active device in the electronic product;
after the control unit is not powered on and the micro switch is pressed for a long time, the control unit is powered on, and the second I/O interface of the control unit outputs a Power-on instruction Power _ EN to the switch unit, so that the switch unit locks the input end of the Power conversion unit to supply Power, and further locks the working Power supply.
It should be noted that the control unit may be a single chip, and according to the type and the required power supply required by the actual application, the power supply conversion unit may convert the input power supply VBAT + into the voltage required by each active device in the electronic product, for example, the voltage required by the control unit, so as to provide the operating power supply for these functional units. Of course, in practical applications, according to different models of the single chip microcomputer, the power input end of the control unit may be connected to the output end Vout of the power conversion unit, as shown in fig. 1, or connected to the input end Vin of the power conversion unit, that is, the rear end of the power conversion unit may supply power to the control unit, or the front end of the power conversion unit may supply power to the control unit, which is not limited in the present invention.
In addition, the output end of the power conversion unit may have one path or multiple paths, and respectively output different voltages for different active devices in the same electronic product.
In addition, the power conversion unit may adopt some power conversion modules existing in the market.
The switching unit may be directly powered by the input power supply VBAT +, i.e. the input power supply VBAT + is directly connected to the power supply input of the switching unit.
The operation of the circuit is described below with reference to fig. 1.
When the microswitch SW3 is pressed for a long time, the microswitch is used as a power switch to switch on the input power supply VBAT + and the power conversion unit, so that the power conversion unit provides working power supply to the control unit, thereby powering on the control unit.
After the control unit is powered on, the second I/O interface outputs a Power-on instruction Power _ EN to the switch unit, so that the switch unit locks the input end of the Power conversion unit for Power supply, and further locks the working Power supply.
After the working power supply is locked, when the microswitch SW3 is clicked, the microswitch serves as a function key to output a control instruction to the first I/O interface of the control unit, namely, the control instruction corresponding to the function key.
The microswitch is a switch having a minute contact gap and a snap action mechanism, which is a contact mechanism for performing a switching action with a predetermined stroke and a predetermined force, and covered with a case, and a drive lever is provided outside the case. In the embodiment of the invention, the microswitch is used as the power supply self-locking switch, so that the microswitch has a power supply switch and a function key, the whole system of the electronic product can be normally powered, all the function keys can execute corresponding operation, and the microswitch can execute the operation corresponding to the function keys.
Further, in order to avoid the control unit from being damaged or working abnormally due to the impact of the external interference signal and the like on the control unit when the Power-on command Power _ EN is sent, as shown in fig. 2, in another embodiment of the Power switch circuit for an electronic product of the present invention, the circuit may further include: the Power supply switching device comprises a control unit, a driving unit, a switching unit and a Power supply, wherein the driving unit is arranged between the control unit and the switching unit and used for driving the switching unit to lock the input end of the Power supply switching unit for Power supply according to the starting instruction Power _ EN, and then the working Power supply is locked. The drive unit may likewise be directly powered by the input power supply VBAT +.
When the power-off is needed, the microswitch SW3 can be pressed for a long time, and after the control unit receives a corresponding long-press operation signal, the second I/O interface outputs a power-off instruction to the switch unit to make the switch unit disconnect the power supply of the input terminal Vin of the power conversion unit, so that the power conversion unit does not output any working power supply required by each active device any more, and the power-off is realized.
Fig. 3 is a specific circuit diagram of the power switch circuit for electronic products according to the present invention.
The control unit and the power conversion unit are omitted in fig. 3 for clarity.
In this example, the driving unit employs an NPN transistor Q1, and the switching unit employs a P-channel MOS transistor Q2. Of course, other one or more components with corresponding functions may also be used to implement the present invention, and the embodiment of the present invention is not limited thereto.
Referring to fig. 3, the base of the transistor Q1 is connected to the second I/O interface of the control unit, the collector of the transistor Q1 is connected to the gate G of the MOS transistor Q2, and the collector of the transistor Q1 is further connected to the input power VBAT + via a pull-up resistor R8; the emitter of the transistor Q1 is grounded.
The gate G of the MOS transistor Q2 is connected to the collector of the transistor Q1, the source S of the MOS transistor Q2 is connected to the input power VBAT +, and the drain D of the MOS transistor Q2 is connected to the input Vin of the power conversion unit.
In the embodiment shown in fig. 3, the power-on command is a high level signal, and the power-off command is a low level signal.
Further, the circuit may further include: a first protection unit disposed between the input power VBAT + and the micro switch SW3, such as a diode D1 connected between the input power VBAT + and ground in fig. 3, may prevent VBAT + from flowing backward.
Further, the circuit may further include: a second protection unit disposed between the micro switch SW3 and the power conversion unit, such as a diode D2 connected between the micro switch SW3 and the power conversion unit in fig. 3. By utilizing the one-way conductivity of the diode D2, the voltage of Vin can be effectively prevented from being higher than VBAT +. In addition, as shown in fig. 3, the second protection unit may further include a pull-down resistor R11 connected between the microswitch SW3 and ground, so that the level of the microswitch SW3 may be kept stable when it is used as a function key, i.e., when the microswitch SW3 is not pressed when it is used as a function key, the level is always kept at a low level.
Further, the circuit may further include: a third protection unit disposed between the control unit and the driving unit, such as a lower resistor R6 connected between the base of the transistor Q1 and ground in fig. 3, can stabilize the base level of the transistor Q1 when the control unit does not output the Power _ EN signal.
Continuing to refer to fig. 3, when the microswitch SW3 is pressed, the input Power VBAT + is conducted to the input terminal Vin of the Power conversion unit through the diode D2, at this time, the control unit is powered on to start initialization, and after the control unit sends the Power-on command Power _ EN, the input Power VBAT + is conducted to the input terminal Vin of the Power conversion unit through the MOS transistor Q2, at this time, the system works normally, and the SW3 can be released.
Because the control unit is initialized, the second I/O interface of the control unit sends a Power-on command Power _ EN to enable the base electrode of the triode Q1 to continuously keep a high level state, the triode Q1 pushes the MOS transistor Q2 to keep a conducting state, then the system Power supply is locked, then the SW3 can be operated as a function KEY, and when the W3 is used as the function KEY, the KEY _ STOP is a KEY function command receiving port. KEY _ STOP may be connected to one I/O interface of the control unit, i.e. the first I/O interface described before.
When the power supply of the system needs to be cut off, the microswitch SW3 can be pressed again for a long time, after the control unit receives a corresponding long press operation signal, the second I/O interface outputs a shutdown instruction to the switch unit, namely the second I/O interface is changed into low level, so that the triode Q1 and the MOS tube Q2 are cut off, the path from the input power VBAT + to the input end Vin of the power conversion unit through the MOS tube Q2 is cut off, the power conversion unit does not output working power required by each active device any more, at the moment, the system is powered off, and the SW3 is loosened, so that shutdown is realized.
In addition, in some electronic product applications, the control unit may be further configured to output a shutdown instruction to the switch unit through the second I/O interface when no user operation is detected within a set time, so that the switch unit disconnects power supply to the input terminal of the power conversion unit.
The power switch circuit for the electronic product uses the micro switch to enable the micro switch to have a power switch and a function key, wherein one end of the micro switch is connected with an input power supply, and the other end of the micro switch is respectively connected with the input end of the power conversion unit and the first I/O interface of the control unit. After the control unit is not powered on and the microswitch is pressed for a long time, the microswitch is connected with the input power supply and the power supply conversion unit, so that the power supply conversion unit provides working power supply for the control unit; after the control unit is powered on, the control unit outputs a starting-up instruction to the switch unit through the second I/O interface, so that the switch unit locks the input end of the power conversion unit to supply power and further locks the working power supply, the whole system of the electronic product keeps normal power supply, all the function keys can execute corresponding operations, and the microswitch can execute the operations corresponding to the function keys. According to the scheme of the invention, a micro switch is used as a power supply self-locking switch, so that one power supply switch can be reduced, the PCB layout space of a power supply part is reduced, the die design and element arrangement difficulty of an electronic product are reduced, and hardware resources can be effectively saved.
In addition, compared with the existing power switch used independently, the power switch controlled by the control unit in the scheme of the invention can quickly eliminate the related welding problem of the control unit, and the problem point can be quickly locked only by testing whether the weak current part is electrified or not.
In addition, when the electronic product using the power switch circuit is used in factory test or when a user is installed in a home, the power of the control unit can be switched off when the power is not used after the input power is switched on, instead of only enabling the control unit to be in a sleep mode, so that the power consumption can be effectively reduced, and the power utilization safety of the electronic product can be ensured.
The above embodiments of the present invention have been described in detail, and the present invention has been described herein with reference to particular embodiments, but the above embodiments are merely intended to facilitate an understanding of the methods and apparatuses of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A power switching circuit for an electronic product, the circuit comprising: the control unit, the switch unit, the power conversion unit and the microswitch are provided with a power switch and a functional key; one end of the microswitch is connected with an input power supply, and the other end of the microswitch is respectively connected with the input end of the power supply conversion unit and the first I/O interface of the control unit; the microswitch is used as a power switch when being pressed for a long time, and the microswitch is used as a function key when being clicked;
the power supply conversion unit is used for providing a working power supply for an active device in the electronic product;
and after the control unit is not powered on and the microswitch is pressed for a long time, the control unit is powered on, and the second I/O interface of the control unit outputs a starting-up instruction to the switch unit, so that the switch unit locks the input end of the power conversion unit to supply power.
2. The power switching circuit of claim 1, further comprising: and the driving unit is arranged between the control unit and the switch unit and is used for driving the switch unit to lock the input end of the power conversion unit for power supply according to the starting instruction.
3. The power switch circuit according to claim 2, wherein the driving unit is an NPN-type transistor, a base of the transistor is connected to the second I/O interface of the control unit, and a collector of the transistor is connected to the switching unit and to the input power supply through a pull-up resistor; and the emitter of the triode is grounded.
4. The power switching circuit according to claim 3, wherein the switching unit is a P-channel MOS transistor; the grid electrode of the MOS tube is connected with the collector electrode of the triode, the source electrode of the MOS tube is connected with the input power supply, and the drain electrode of the MOS tube is connected with the input end of the power supply conversion unit.
5. A power switching circuit according to any one of claims 1 to 4,
after the microswitch is pressed for a long time in the work of the control unit, the second I/O interface of the control unit outputs a shutdown instruction to the switch unit, so that the switch unit cuts off the power supply of the input end of the power supply conversion unit.
6. The power switch circuit according to claim 5, wherein the control unit is further configured to output a shutdown instruction to the switch unit through the second I/O interface when no user operation is detected within a set time, so that the switch unit disconnects power supply to the input terminal of the power conversion unit.
7. The power switch circuit of claim 5, wherein the control unit is a single chip, and the power-on command is a high-level signal; the shutdown instruction is a low level signal.
8. The power switching circuit of claim 5, further comprising: a first protection unit disposed between the input power source and the micro switch.
9. The power switching circuit of claim 5, further comprising: and the second protection unit is arranged between the micro switch and the power conversion unit.
10. The power switching circuit of claim 5, further comprising: a third protection unit disposed between the control unit and the driving unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010331905.2A CN111694418A (en) | 2020-04-24 | 2020-04-24 | Power switch circuit for electronic product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010331905.2A CN111694418A (en) | 2020-04-24 | 2020-04-24 | Power switch circuit for electronic product |
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| CN111694418A true CN111694418A (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010331905.2A Pending CN111694418A (en) | 2020-04-24 | 2020-04-24 | Power switch circuit for electronic product |
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Application publication date: 20200922 |