CN211606181U - Power supply switching circuit and electronic equipment - Google Patents
Power supply switching circuit and electronic equipment Download PDFInfo
- Publication number
- CN211606181U CN211606181U CN201922335161.7U CN201922335161U CN211606181U CN 211606181 U CN211606181 U CN 211606181U CN 201922335161 U CN201922335161 U CN 201922335161U CN 211606181 U CN211606181 U CN 211606181U
- Authority
- CN
- China
- Prior art keywords
- resistor
- power supply
- effect transistor
- node
- field effect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Electronic Switches (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The embodiment of the utility model provides a power supply switching circuit and electronic equipment, including battery input end, USB direct current power supply input end, first field effect transistor, second field effect transistor, diode, first switch control module group and second switch control module group; the first switch control module controls the first field effect transistor to be conducted when the USB direct-current power supply input end is not powered; the second switch module controls the second field effect transistor to be conducted when the USB direct-current power supply input end does not supply power; the first switch control module controls the first field effect transistor to be disconnected when the USB direct-current power supply input end supplies power; and the second switch module controls the second field effect transistor to be switched off when the USB direct-current power supply input end supplies power. The embodiment of the utility model provides an in having solved current application scene, the application scene that power supply switching circuit exists is too single, energy loss is too much, switch the problem that is restricted by battery voltage.
Description
Technical Field
The embodiment of the utility model provides a relate to electron technical field, especially relate to a power supply switching circuit and electronic equipment.
Background
At present, when a battery power supply circuit is switched by a USB (Universal Serial Bus) power supply, a lot of designers adopt SBD (Schottky Barrier Diode) or a simple PMOS (p-channel enhanced field effect transistor) to switch the power supply, although the functions can be met, the application scene is single, the energy loss is too much, and the problem that the switching of two paths of power supplies can be quickly, normally and safely completed only by limiting the voltage of the battery exists, and the limitation is large.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a power supply switching circuit and electronic equipment to in solving current application scene, the application scene that power supply switching circuit exists is too single, energy loss is too much, switch the problem that is restricted by battery voltage.
In order to solve the technical problem, the utility model discloses a realize like this:
in a first aspect, an embodiment of the present invention provides a power switching circuit, including a battery input terminal, a USB dc power input terminal, a first field-effect transistor, a second field-effect transistor, a diode, a first switch control module, and a second switch control module;
the battery input end is connected with the first pole of the first field effect transistor;
the second pole of the first field effect transistor is connected with the first pole of the second field effect transistor, and the grid electrode of the first field effect transistor is connected with the first switch control module;
the second pole of the second field effect transistor is connected with a system power supply end, and the grid of the second field effect transistor is connected with the second switch control module;
the input end of the USB direct-current power supply is connected with the input end of the diode;
the output end of the diode is connected with the system power supply end;
the first switch control module controls the first field effect transistor to be conducted when the USB direct-current power supply input end is not powered; the second switch module controls the second field effect transistor to be conducted when the USB direct-current power supply input end does not supply power;
the first switch control module controls the first field effect transistor to be disconnected when the USB direct-current power supply input end supplies power; and the second switch module controls the second field effect transistor to be switched off when the USB direct-current power supply input end supplies power.
Optionally, the first field effect transistor is a p-channel enhanced field effect transistor, and the second field effect transistor is a p-channel enhanced field effect transistor.
Optionally, the first switch control module includes: the first resistor, the sixth resistor, the eighth resistor, the first NPN type triode and the second NPN type triode are connected in series;
the base electrode of the first NPN type triode is connected with the node A, the collector electrode of the first NPN type triode is connected with the node B, and the emitting electrode of the first NPN type triode is grounded;
one end of the eighth resistor is connected with the node A, and the other end of the eighth resistor is connected with the emitting electrode of the first NPN type triode;
a base electrode of the second NPN type triode is connected with a node C, a collector electrode of the second NPN type triode is connected with a grid electrode of the first field effect transistor, and an emitting electrode of the second NPN type triode is grounded;
one end of the sixth resistor is connected with the node C, and the other end of the sixth resistor is connected with the emitting electrode of the second NPN type triode;
the battery input end is connected with the node B;
the input end of the USB direct-current power supply is connected with the node A;
the node B is connected with the node C;
one end of the first resistor is connected with the first pole of the first field effect transistor, and the other end of the first resistor is connected with the collector of the first NPN type triode.
Optionally, the first switch control module further includes a fifth resistor, a second resistor, and a fourth resistor;
one end of the fifth resistor is connected with the input end of the USB direct-current power supply, and the other end of the fifth resistor is connected with the node A;
one end of the second resistor is connected with the battery input end, and the other end of the second resistor is connected with the node B;
one end of the fourth resistor is connected with the node B, and the other end of the fourth resistor is connected with the node C.
Optionally, the second switch control module includes: one end of the seventh resistor is grounded, the other end of the seventh resistor is connected with a node D, the input end of the USB direct-current power supply is connected with the node D, and the grid electrode of the second field-effect tube is connected with the node D.
Optionally, the second switch control module further includes: and one end of the third resistor is connected with the grid electrode of the second field effect transistor, and the other end of the third resistor is connected with the node D.
Optionally, the diode is a schottky diode.
In a second aspect, an embodiment of the present invention provides an electronic device, including the power switching circuit according to any one of the first aspect.
Optionally, the electronic device is an intelligent door lock.
The embodiment of the utility model provides an in, through the hardware design who optimizes power supply switching circuit for power conversion turn-offs more thoroughly, does not receive the voltage restriction, has reverse characteristics by, low energy loss, low cost and that application scene is abundant.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a power switching circuit and an electronic device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power switching circuit and an electronic device according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a power switching circuit and an electronic device according to another embodiment of the present invention.
1 a battery input end; 2USB DC power supply input end; 3 a first switch control module; 4 a second switch control module;
q1 first field effect transistor; q2 second field effect transistor; a Q3 second NPN transistor; a Q4 first NPN transistor; a D1 diode;
r1 first resistance; r2 second resistance; r3 third resistor; r4 fourth resistor; r5 fifth resistor; r6 sixth resistor; r7 seventh resistor; an eighth resistor of R8; a node A; a node B; a node C; and D, a node D.
Detailed Description
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 some, not all, of the embodiments of the present invention. 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.
Referring to fig. 1, the present invention provides a power switching circuit, which includes a battery input terminal 1, a USB dc power input terminal 2, a first field effect transistor Q1, a second field effect transistor Q2, a diode D1, a first switch control module 3, and a second switch control module 4;
the battery input end 1 is connected with a first pole of the first field effect transistor Q1;
the second pole of the first field effect transistor Q1 is connected with the first pole of the second field effect transistor Q2, and the grid is connected with the first switch control module 3;
a second pole of the second field effect transistor Q2 is connected with a system power supply end, and a grid of the second field effect transistor Q2 is connected with the second switch control module 4;
the USB direct-current power supply input end 2 is connected with the input end of the diode D1;
the output end of the diode D1 is connected with the system power supply end;
when the USB direct-current power supply input end 2 is not powered, the first switch control module 3 controls the first field-effect transistor Q1 to be turned on; when the USB dc power input terminal 2 is not powered, the second switch module 3 controls the second fet Q2 to be turned on;
when the USB direct current power supply input end 2 supplies power, the first switch control module 3 controls the first field-effect transistor Q1 to be turned off; and when the second switch module 4 supplies power to the USB direct-current power supply input end 2, the second field-effect transistor Q2 is controlled to be turned off.
The embodiment of the utility model provides an in, through the hardware design who optimizes power supply switching circuit, energy loss's problem when having solved the power supply switching for power conversion turn-offs more thoroughly, does not receive the voltage restriction, has reverse characteristics by, low energy loss, low cost and that application scene is abundant.
In some embodiments of the present invention, optionally, the first fet Q1 is a p-channel enhancement fet, and the second fet Q2 is a p-channel enhancement fet.
The embodiment of the utility model provides an in, through setting up 2 p channel enhancement mode field effect transistors, cooperation first switch control module group, second switch control module group carry out state control respectively, have realized battery supply circuit's thorough turn-offs, have solved single p channel enhancement mode field effect transistor and have been applied to power switching circuit and use the scene limited, can not thoroughly turn-off battery supply path, cause battery energy loss's problem.
Referring to fig. 2, fig. 2 is a schematic diagram of a power switching circuit and an electronic device according to another embodiment of the present invention, in which the first fet Q1 is a p-channel enhancement fet, and the second fet Q2 is a p-channel enhancement fet;
in some embodiments of the present invention, optionally, the first switch control module 3 includes: the circuit comprises a first resistor R1, a sixth resistor R6, an eighth resistor R8, a first NPN type triode Q4 and a second NPN type triode Q3;
the base electrode of the first NPN triode Q4 is connected with a node A, the collector electrode of the first NPN triode Q4 is connected with a node B, and the emitting electrode of the first NPN triode Q4 is grounded;
one end of the eighth resistor R8 is connected to the node A, and the other end is connected to the emitter of the first NPN transistor Q4;
the base electrode of the second NPN triode Q3 is connected with the node C, the collector electrode of the second NPN triode Q3 is connected with the grid electrode of the first field effect transistor Q1, and the emitter electrode of the second NPN triode Q3 is grounded;
one end of the sixth resistor R6 is connected to the node C, and the other end is connected to the emitter of the second NPN transistor Q3;
the battery input end 1 is connected with the node B;
the USB direct-current power supply input end 2 is connected with the node A;
the node B is connected with the node C;
one end of the first resistor R1 is connected to the first pole of the first fet Q1, and the other end is connected to the collector of the first NPN transistor Q4.
The embodiment of the utility model provides an in, through introducing pull-up resistance, pull-down resistance and triode, provide a circuit by the switch control module group of battery input end and USB DC power supply input power supply, utilize basic electronic components, do not additionally introduce the third party power, optimize pure hardware circuit, effectively controlled the cost of power switching circuit actual production application.
Referring to fig. 3, fig. 3 is a schematic diagram of a power switching circuit and an electronic device according to another embodiment of the present invention, in which the first fet Q1 is a p-channel enhancement fet and the second fet Q2 is a p-channel enhancement fet;
in some embodiments of the present invention, optionally, the first switch control module 3 further includes a fifth resistor R5, a second resistor R2, and a fourth resistor R4;
one end of the fifth resistor R5 is connected with the USB direct-current power supply input end 1, and the other end is connected with the node A;
one end of the second resistor R2 is connected with the battery input end 1, and the other end of the second resistor R2 is connected with the node B;
one end of the fourth resistor R4 is connected to the node B, and the other end is connected to the node C.
The embodiment of the utility model provides an in, through introducing current-limiting resistor, further optimized switch control module group circuit, strengthened the on-off control to first field effect transistor.
Referring to fig. 2, in some embodiments of the present invention, optionally, the second switch control module 4 includes: and one end of the seventh resistor R7 is grounded, the other end of the seventh resistor R7 is connected with a node D, the USB direct-current power supply input end 1 is connected with the node D, and the grid electrode of the second field-effect transistor Q2 is connected with the node D.
The embodiment of the utility model provides an in, through introducing pull-down resistance, provide a circuit by the switch control module group of USB DC power supply input power supply, utilize basic electronic components, do not additionally introduce the third party power, optimize pure hardware circuit, effectively controlled the cost of power switching circuit actual production application.
Referring to fig. 3, in some embodiments of the present invention, optionally, the second switch control module 4 further includes: and a third resistor R3, wherein one end of the third resistor R3 is connected with the second field effect transistor Q2, and the other end is connected with the node D.
The embodiment of the utility model provides an in, through introducing drop-down resistance, further optimized switch control module group circuit, strengthened the on-off control to the second field effect transistor.
In some embodiments of the present invention, optionally, the diode D1 is a schottky diode.
The embodiment of the utility model provides an in, utilize schottky diode to have reverse characteristic that ends, to the sight of the reverse charging of USB end when having avoided the power to switch to battery powered, effectively kept apart battery power and USB power.
The utility model also provides an electronic equipment, include as above-mentioned arbitrary embodiment the power supply switching circuit.
The embodiment of the utility model provides an in, electronic equipment can be fast, normal, safety, low energy loss, accomplish the switching of two way powers with low costs.
In some embodiments of the present invention, optionally, the electronic device is an intelligent door lock.
Referring to fig. 3, in the embodiment of the present invention, the pull-up resistors R1, R3, R6, R7, and R8 are all 1M Ω, and the current-limiting resistors R2, R4, and R5 are all 4.7K Ω;
the input end of the USB direct-current power supply comprises a USB line connected with a charger or a USB line connected with an adapter, and a 5V power supply is output;
the output of the battery input end is 4.0-6.4V, generally 4 No. 5 dry batteries are connected in series, and the output is 6.0V normally.
When the battery is powered and no external USB is used for power supply, at the moment, the second NPN type triode Q3 is conducted, the grid electrode of the first field-effect tube Q1 is pulled down, the first field-effect tube Q1 is conducted, the grid electrode of the second field-effect tube Q2 is pulled down to the ground through R3 and R7, current flows to the source electrode of the second field-effect tube Q2 through the parasitic diode of the second field-effect tube Q2, Vgs of the second field-effect tube Q2 is larger than the starting voltage, the second field-effect tube Q2 is conducted, and at the moment, the battery input end 1 normally supplies power for the system through the first field-effect tube Q1 and the second field-effect tube Q2.
When an external USB power supply is added, the first NPN type triode Q4 is conducted, the second NPN type triode Q3 is turned off, the grid electrode of the first field effect transistor Q1 is pulled high to a high level again, the first field effect transistor Q1 is turned off, the grid electrode of the second field effect transistor Q2 is pulled high by the accessed external USB power supply, at the moment, Vgs of the second field effect transistor Q2 is larger than 0, the second field effect transistor Q2 is turned off, and at the moment, the external USB power supply normally supplies power to the system through the Schottky diode D1.
The embodiment of the utility model provides an in, under the prerequisite of the demand of the inside battery power supply of outside USB power automatic switch-over of having satisfied intelligent lock, guaranteed the maximize utilization of intelligent lock battery energy simultaneously, power supply switching circuit has low energy loss, low-cost and the extensive characteristic of application scene.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (9)
1. A power supply switching circuit is characterized by comprising a battery input end, a USB direct-current power supply input end, a first field-effect tube, a second field-effect tube, a diode, a first switch control module and a second switch control module;
the battery input end is connected with the first pole of the first field effect transistor;
the second pole of the first field effect transistor is connected with the first pole of the second field effect transistor, and the grid electrode of the first field effect transistor is connected with the first switch control module; the second pole of the second field effect transistor is connected with a system power supply end, and the grid of the second field effect transistor is connected with the second switch control module;
the input end of the USB direct-current power supply is connected with the input end of the diode;
the output end of the diode is connected with the system power supply end;
the first switch control module controls the first field effect transistor to be conducted when the USB direct-current power supply input end is not powered; the second switch module controls the second field effect transistor to be conducted when the USB direct-current power supply input end does not supply power;
the first switch control module controls the first field effect transistor to be disconnected when the USB direct-current power supply input end supplies power; and the second switch module controls the second field effect transistor to be switched off when the USB direct-current power supply input end supplies power.
2. The power switching circuit of claim 1, wherein the first fet is a p-channel enhancement mode fet and the second fet is a p-channel enhancement mode fet.
3. The power switching circuit according to claim 2, wherein the first switch control module comprises: the first resistor, the sixth resistor, the eighth resistor, the first NPN type triode and the second NPN type triode are connected in series;
the base electrode of the first NPN type triode is connected with a node A, the collector electrode of the first NPN type triode is connected with a node B, and the emitting electrode of the first NPN type triode is grounded;
one end of the eighth resistor is connected with the node A, and the other end of the eighth resistor is connected with the emitting electrode of the first NPN type triode;
a base electrode of the second NPN type triode is connected with a node C, a collector electrode of the second NPN type triode is connected with a grid electrode of the first field effect transistor, and an emitting electrode of the second NPN type triode is grounded;
one end of the sixth resistor is connected with the node C, and the other end of the sixth resistor is connected with the emitting electrode of the second NPN type triode;
the battery input end is connected with the node B;
the input end of the USB direct-current power supply is connected with the node A;
the node B is connected with the node C;
one end of the first resistor is connected with the first pole of the first field effect transistor, and the other end of the first resistor is connected with the collector of the first NPN type triode.
4. The power supply switching circuit according to claim 3, wherein the first switch control module further comprises a fifth resistor, a second resistor, and a fourth resistor;
one end of the fifth resistor is connected with the input end of the USB direct-current power supply, and the other end of the fifth resistor is connected with the node A;
one end of the second resistor is connected with the battery input end, and the other end of the second resistor is connected with the node B;
one end of the fourth resistor is connected with the node B, and the other end of the fourth resistor is connected with the node C.
5. The power switching circuit according to claim 2, wherein the second switch control module comprises: one end of the seventh resistor is grounded, the other end of the seventh resistor is connected with a node D, the input end of the USB direct-current power supply is connected with the node D, and the grid electrode of the second field-effect tube is connected with the node D.
6. The power switching circuit of claim 5, wherein the second switch control module further comprises: and one end of the third resistor is connected with the grid electrode of the second field effect transistor, and the other end of the third resistor is connected with the node D.
7. The power switching circuit of claim 1, wherein the diode is a schottky diode.
8. An electronic device comprising the power switching circuit as claimed in any one of claims 1 to 7.
9. The electronic device of claim 8, wherein the electronic device is a smart door lock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922335161.7U CN211606181U (en) | 2019-12-23 | 2019-12-23 | Power supply switching circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922335161.7U CN211606181U (en) | 2019-12-23 | 2019-12-23 | Power supply switching circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211606181U true CN211606181U (en) | 2020-09-29 |
Family
ID=72594686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922335161.7U Active CN211606181U (en) | 2019-12-23 | 2019-12-23 | Power supply switching circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211606181U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113220104A (en) * | 2021-06-02 | 2021-08-06 | 深圳市绘王动漫科技有限公司 | Switching circuit board and TYPE-C line for solving power supply problem |
-
2019
- 2019-12-23 CN CN201922335161.7U patent/CN211606181U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113220104A (en) * | 2021-06-02 | 2021-08-06 | 深圳市绘王动漫科技有限公司 | Switching circuit board and TYPE-C line for solving power supply problem |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104596049B (en) | Current loop communication circuit and air-conditioner | |
| CN205509647U (en) | Switch control device | |
| WO2023016574A1 (en) | Switching circuit, battery management system, battery pack, electrical device and control method | |
| CN210745102U (en) | Bidirectional electronic switch and power supply circuit | |
| CN211606181U (en) | Power supply switching circuit and electronic equipment | |
| CN108110835A (en) | A kind of low power consumpting controling circuit for high-voltage battery system | |
| CN107733413B (en) | Intelligent switch circuit and intelligent terminal of pre-installation battery system | |
| CN104079158A (en) | Ultra-low static power consumption power source starting control circuit | |
| CN109347315B (en) | Power-on buffer circuit of power electronic device | |
| CN110768518A (en) | Power isolation circuit and intelligent door lock system | |
| CN207368744U (en) | Power supply power switching circuit | |
| CN110661412A (en) | Surge circuit and antenna electrically-tuning controller | |
| CN216751197U (en) | Power supply reverse connection prevention circuit and intelligent door lock | |
| CN116203825A (en) | Voltage polarity switching circuit, wire controller and control system | |
| CN205141990U (en) | Soft start power controller | |
| CN214756076U (en) | MOS pipe control circuit and device | |
| CN202094845U (en) | Device for managing power supply | |
| CN211880123U (en) | Output protection device of charger | |
| CN210469114U (en) | Surge circuit and antenna electrically-tuning controller | |
| CN107910849B (en) | Overvoltage, reverse connection and power failure protection circuit | |
| CN209767563U (en) | device capable of transmitting signals through positive and negative lines of power supply | |
| CN216436878U (en) | Power supply automatic switching circuit applied to photovoltaic tracking system | |
| CN211266757U (en) | Power isolation circuit and intelligent door lock system | |
| CN218216797U (en) | Voltage conversion circuit of charger | |
| CN212210571U (en) | Dry battery power supply circuit for temperature measuring gun |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |