CN109474042A - Power supply switch circuit and electronic equipment - Google Patents
Power supply switch circuit and electronic equipment Download PDFInfo
- Publication number
- CN109474042A CN109474042A CN201811601190.7A CN201811601190A CN109474042A CN 109474042 A CN109474042 A CN 109474042A CN 201811601190 A CN201811601190 A CN 201811601190A CN 109474042 A CN109474042 A CN 109474042A
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- power supply
- semiconductor
- oxide
- metal
- triode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/40—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries adapted for charging from various sources, e.g. AC, DC or multivoltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
The present invention discloses a kind of power supply switch circuit and electronic equipment.Power supply switch circuit includes: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and triode；The control terminal of first metal-oxide-semiconductor connects external direct current power supply socket, and first end connects battery, and second end connects load supplying interface；The first end of the control terminal connecting triode of second metal-oxide-semiconductor, first end connect external direct current power supply socket, and second end connects the second end of third metal-oxide-semiconductor；The first end of the control terminal connecting triode of third metal-oxide-semiconductor, first end connect load supplying interface；The control terminal of triode connects external direct current power supply socket, second end ground connection；First metal-oxide-semiconductor, in response to external direct current power supply socket and external power supply disconnection and be connected and in response to external direct current power supply socket access external power supply and by；Second metal-oxide-semiconductor and third metal-oxide-semiconductor, be connected respectively responsive to access and in response to disconnection and by.The power supply switching efficiency of the power supply switch circuit is high, high reliablity and circuit are simple.
Description
Technical field
The present invention relates to electronic circuit technology fields.More particularly, to a kind of power supply switch circuit and electronic equipment.
Background technique
Currently, electronic equipment, especially portable, low power electronic equipment is usually mentioned using battery powered simultaneously
For external direct current power supply socket, to facilitate user to select between external power supply and battery.Under normal conditions, battery and outer
External power supply electron equipment is preferentially selected to power when connecing power supply while accessing.But since battery can occur with charge/discharge
Voltage change, so there are inconsistent phenomenons for the voltage between external power supply and battery, it must be to battery in circuit design
It is isolated with external power supply.A kind of existing simple isolation method is to carry out power supply switching by mechanical switch, is such as passed through
Toggle switch, electromagnetic relay etc..But there are larger disadvantage, toggle switches, and user to be needed to be manually operated for this mode, very not square
Just；And electromagnetic relay then exists that size is larger, have the shortcomings that static leakage current, work has noise.
In addition to the mode for carrying out power supply switching above by mechanical switch, there is also following two modes for the prior art:
The first, a large amount of portable electronic device realizes power supply from cost angle is reduced, using Schottky diode
Between isolation.But the power consumption of portable electronic device is limited, has a little pressure drop using Schottky diode, complete machine can be with work
Make, but power supply efficiency is not high.On rare occasion, such as complete machine moment high power work, under will cause complete machine supply voltage sharply
It drops, even will cause complete machine under extreme case and shut down extremely.
The second, individual electronic equipment is in such a way that PMOS tube combination NMOS tube constitutes two groups of switching switches, one group of power supply
Corresponding one group of switch.Wherein, PMOS tube is as power switch, and by NMOS tube drive control, and the driving condition of NMOS tube then takes
Certainly whether accessed in external power supply.If accessing external power supply, NMOS tube makes the PMOS tube conducting of corresponding external power supply, makes simultaneously
The PMOS tube of corresponding battery is by vice versa.Which is compared in the way of Schottky diode, is mentioned in performance
It rises, since the pressure drop under PMOS tube fully on state is generally less than Schottky diode, so complete machine power supply efficiency is mentioned
It rises.But the disadvantage is that the driving of NMOS tube, which needs to meet Vgs, is greater than unlatching thresholding Vgs (th), this requires NMOS tubes must be by one
A high-voltage power supply driving more higher than supply voltage, such as cell voltage is 4.2V, external power supply voltage is 5.0V, in order to guarantee
NMOS tube can work normally, and need to provide it burning voltage of 7V or more.Obviously, outer must thus increase
Voltage source or system power supply can generate high pressure and be introduced into control circuit, increase circuit cost and circuit is complicated
Property.
In addition, there are also be all using design schemes, the basic ideas of these design schemes such as comparator, microcontrollers
By logical device according to certain condition, for example whether detecting the conditions such as the size of insertion external power supply, supply voltage, switching
Power switch tube, but the circuit realization of these design schemes is complex.
Accordingly, it is desirable to provide a kind of new power supply switch circuit and electronic equipment.
Summary of the invention
The purpose of the present invention is to provide a kind of power supply switch circuit and electronic equipments, to solve of the existing technology ask
At least one of topic.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
First aspect present invention provides a kind of power supply switch circuit, including the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd MOS
Pipe and triode；The control terminal of first metal-oxide-semiconductor connects external direct current power supply socket, and first end connects battery, and second end connects
Connect load supplying interface；The control terminal of second metal-oxide-semiconductor connects the first end of the triode, and first end connection is described external
DC source socket, second end connect the second end of the third metal-oxide-semiconductor；The control terminal connection described three of the third metal-oxide-semiconductor
The first end of pole pipe, first end connect load supplying interface；The control terminal of the triode connects the external direct current power supply and inserts
Mouthful, second end ground connection；
First metal-oxide-semiconductor, in response to external direct current power supply socket and external power supply disconnection and be connected and in response to outer
Connect DC source socket access external power supply and by；Second metal-oxide-semiconductor and third metal-oxide-semiconductor, respectively responsive to the access
And be connected and in response to it is described disconnection and by.
Preferably, first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor are respectively PMOS tube.
Preferably, the second end of second metal-oxide-semiconductor and the second end of third metal-oxide-semiconductor are respectively source electrode, power supply switching electricity
Road further includes first resistor device, and the first end of the first resistor device connects the source electrode of second metal-oxide-semiconductor, and second end connects institute
State the first end of triode.
It preferably, further include second resistor, the first end of the second resistor connects the control of first metal-oxide-semiconductor
End, second end ground connection.
Preferably, the external direct current power supply socket is closed type PWR2.5 socket, and the triode is three pole of NPN type
Pipe, the first end are collector, the control terminal of first metal-oxide-semiconductor, the first end of second metal-oxide-semiconductor and the triode
Control terminal be separately connected the 1st pin of closed type PWR2.5 socket.
Preferably, the external direct current power supply socket is open type PWR2.5 socket, and the triode is three pole of positive-negative-positive
Pipe, the first end are emitter, and the first end of the control terminal of first metal-oxide-semiconductor and second metal-oxide-semiconductor is separately connected often
1st pin of closed form PWR2.5 socket, the 3rd pin of the control terminal connection open type PWR2.5 socket of the triode.
It preferably, further include delay circuit, the input terminal of the delay circuit connects the external direct current power supply socket, defeated
Outlet connects the control terminal of the triode.
Preferably, the delay circuit is RC delay circuit.
It preferably, further include second resistor, the first end of the second resistor connects the control of first metal-oxide-semiconductor
End, second end connect the external direct current power supply socket.
Second aspect of the present invention provides a kind of electronic equipment, and the power supply provided including battery and first aspect present invention is cut
Change circuit.
Beneficial effects of the present invention are as follows:
Technical solution of the present invention by external power supply access after level state variation control metal-oxide-semiconductor conducting/cut
Extremely, realize automatic switchover between battery and external power supply be isolated, realized with pure hardware circuit, without human intervention and software
Programming, power supply switching efficiency height, high reliablity, circuit is simple and circuit cost is lower.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing；
Fig. 1 shows the circuit diagram of the power supply switch circuit of one embodiment of the present of invention offer.
Fig. 2 shows the circuit diagrams of delay circuit.
Fig. 3 show another embodiment of the present invention provides power supply switch circuit circuit diagram.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, An embodiment provides a kind of power supply switch circuit, including the first metal-oxide-semiconductor Q101,
Second metal-oxide-semiconductor Q102, third metal-oxide-semiconductor Q103 and triode Q104.
The control terminal of the first metal-oxide-semiconductor Q101 connects external direct current power supply socket J101, and first end passes through battery interface
VBAT connection battery, the load supplying interface VCC of second end connection load U101.As shown in Figure 1, the control of the first metal-oxide-semiconductor Q101
End processed is its grid, and the first end for connecting battery drains for it, and the second end of connection load supplying interface VCC is its source electrode.Separately
Outside, it may be alternatively provided as the source electrode connection battery of the first metal-oxide-semiconductor Q101, drain electrode connection load supplying interface VCC, the present embodiment is to this
Without limitation.
The control terminal of the second metal-oxide-semiconductor Q102 connects the first end of the triode Q104, and first end connection is described outer
DC source socket J101 is met, second end connects the second end of the third metal-oxide-semiconductor Q103.The control of the third metal-oxide-semiconductor Q103
End processed connects the first end of the triode Q104, and first end connects load supplying interface VCC.The control of the triode Q104
End connects the external direct current power supply socket J101, second end ground connection.As shown in Figure 1, in the present embodiment, the triode Q104
Control terminal be base stage, first end is collector, and second end is emitter.
The first metal-oxide-semiconductor Q101, in response to external direct current power supply socket J101 and external power supply disconnection and be connected simultaneously
In response to external direct current power supply socket J101 access external power supply and by；The second metal-oxide-semiconductor Q102 and third metal-oxide-semiconductor
Q103 is connected respectively responsive to external direct current power supply socket J101 access external power supply and in response to external direct current power supply socket
The disconnection of J101 and external power supply and by.
Power supply switch circuit provided in this embodiment is dexterously utilized the drain electrode of metal-oxide-semiconductor and source electrode symmetry characteristic and posts
Raw body diode effect, cooperation carry out the triode (BJT) of drive control, effectively realize power supply and automatically switch and be isolated,
Middle isolation is that external power supply is prevented directly to charge to battery, because almost all of charging design is all will be by individually charging
Module is realized, and cannot be directly shorted power supply and battery, otherwise will lead to circuit operation irregularity, or even safe thing occurs
Therefore.Power supply switch circuit provided in this embodiment is realized with pure hardware circuit, is switched without human intervention with software programming, power supply
High-efficient, high reliablity, circuit are simple and circuit cost is lower.
In the present embodiment, the first metal-oxide-semiconductor Q101, the second metal-oxide-semiconductor Q102, third metal-oxide-semiconductor Q103 are respectively PMOS tube,
As shown in Figure 1.It will be appreciated that three in the present embodiment can also be made and making corresponding adjust to circuit shown in FIG. 1
Metal-oxide-semiconductor uses NMOS tube.But according to NMOS tube, then there are problems that plus high-pressure is needed to drive, needs to accurately calculate NMOS tube
Biasing resistor resistance value, precise match NMOS tube is arranged by the resistance value of peripheral resistance, once and resistance, supply voltage or
Person's NMOS tube parameter changes (such as temperature change, the change of metal-oxide-semiconductor model etc.), there is the risk for leading to circuit abnormality.Cause
This, the first metal-oxide-semiconductor Q101, the second metal-oxide-semiconductor Q102, third metal-oxide-semiconductor Q103 in the present embodiment are all made of PMOS tube.
In some optional implementations of the present embodiment, the second end and third metal-oxide-semiconductor of the second metal-oxide-semiconductor Q102
The second end of Q103 is respectively source electrode, and power supply switch circuit further includes first resistor device R111, the first resistor device R111's
First end connects the source electrode of the second metal-oxide-semiconductor Q102, and second end connects the control terminal of the triode Q104.Using this realization
Mode is connected by the setting of the source electrode and drain electrode to the second metal-oxide-semiconductor Q102 and third metal-oxide-semiconductor Q103 using source electrode, can avoid
Generate reverse current.It will be appreciated that the second metal-oxide-semiconductor Q102 and third metal-oxide-semiconductor Q103 can also be set to the side that drain electrode connects
Formula, this mode only need cooperation to change the set-up mode of resistor, equally can avoid generating reverse current.
In some optional implementations of the present embodiment, power supply switch circuit provided in this embodiment further includes the second electricity
Device R106 is hindered, the first end of the second resistor R106 connects the control terminal of the first metal-oxide-semiconductor Q101, second end ground connection.
Using this implementation, it is ensured that the first metal-oxide-semiconductor Q101 control terminal in the disconnection of external DC source socket and external power supply
Level be low level and make the first metal-oxide-semiconductor Q101 be connected.
In some optional implementations of the present embodiment, as shown in Figure 1, the external direct current power supply socket J101 is normal
Closed form PWR2.5 socket, the triode Q104 are NPN type triode, and first end is collector, and second end is emitter, described
The base stage of the control terminal of first metal-oxide-semiconductor Q101, the first end of the second metal-oxide-semiconductor Q102 and the triode Q104 is separately connected
1st pin of closed type PWR2.5 socket.Wherein, the external power supply of the 1st pin connection access of closed type PWR2.5 socket, the
2 pins ground connection, the 3rd pin connect the 1st pin；When accessing external power supply, the 3rd pin is flicked with the 2nd pin, and the 3rd pin is outstanding
It is empty.In this implementation, the disconnection of external DC source socket and external power supply and only battery access in the case where, first
The grid of metal-oxide-semiconductor Q101 is low level, and the first metal-oxide-semiconductor Q101 conducting gives load U101 power supply by battery.Work as external direct current power supply
When socket accesses external power supply, the 3rd pin and the 2nd pin of closed type PWR2.5 is flicked, the 3rd pin floating, then external power supply
Input the grid of the first metal-oxide-semiconductor Q101 and the base stage of triode Q104 are sent to by voltage grading resistor R110 respectively.To one
Aspect, the grid of the first metal-oxide-semiconductor Q101 are high level, and the first metal-oxide-semiconductor Q101 is by this time regardless of whether battery interface accesses electricity
Pond can all force to disconnect battery access；On the other hand, the base stage of the triode Q104 of NPN type is also high level, triode Q104
Conducting, and the grid level of the second metal-oxide-semiconductor Q102 and third metal-oxide-semiconductor Q103 are pulled low to low level, so that the second metal-oxide-semiconductor
Q102 and third metal-oxide-semiconductor Q103 are simultaneously turned on, and external power supply gives load U101 power supply.
It further include second resistor R109, the second resistor in some optional implementations of the present embodiment
The first end of R109 connects the control terminal of the first metal-oxide-semiconductor Q101, and second end connects the external direct current power supply socket J101.
In conjunction with aforementioned implementation, the 1st pin of the second end connection closed type PWR2.5 socket of the second resistor R109.
In some optional implementations of the present embodiment, power supply switch circuit provided in this embodiment further includes delay electricity
Road, the input terminal of the delay circuit connect the external direct current power supply socket J101, and output end connects the triode Q104
Control terminal.Further, the delay circuit in the present embodiment is using as shown in Figure 1 by 3rd resistor device R115 and first capacitor
The RC delay circuit that device C113 is constituted, the order of magnitude of single order RC delay circuit in 50ms or so, can about connect external power supply
Mechanical shaking during entering is filtered, and prevents switch oscillating occur in each device short time, in addition, can also be by simply adjusting
The capacitance-resistance parameter of whole single order RC delay circuit by delays time to control in 20~100ms or so accomplishes that insertion shake can be filtered out i.e.
Can, to timing accuracy almost no requirement (NR).In conjunction with aforementioned implementation, the 3rd resistor device R115 of the input terminal as delay circuit
First end, connect closed type PWR2.5 socket the 1st pin.Except as shown in Figure 1 by the electricity of 3rd resistor device R115 and first
Outside the single order RC delay circuit that container C113 is constituted, second order and the above order of second order is also can be used in the delay circuit in the present embodiment
Delay circuit, or, the delay circuit etc. of the other forms such as LC, active power filtering, as shown in Figure 2.
In addition, the second capacitor C105 and third capacitor C107 of earth shown in FIG. 1 are for filtering and denoising.
As shown in figure 3, another embodiment of the present invention provides power supply switch circuit and electricity provided by the above embodiment
The difference of source switching circuit is: the external direct current power supply socket J101 is open type PWR2.5 socket, the triode
Q104 is PNP type triode, and first end is current collection extremely emitter, and second end is collector, the control of the first metal-oxide-semiconductor Q101
The first end of end processed and the second metal-oxide-semiconductor Q102 are separately connected the 1st pin of closed type PWR2.5 socket, the triode
3rd pin of the control terminal connection open type PWR2.5 socket of Q104.Wherein, the 1st pin connection of open type PWR2.5 socket
The external power supply of access, the 2nd pin ground connection；When accessing external power supply, the 3rd pin is contacted with the 2nd pin.
Another embodiment of the present invention provides a kind of electronic equipment, provide including battery and any of the above-described embodiment
Power supply switch circuit.
It should be noted that in the description of the present invention, relational terms such as first and second and the like are used merely to
It distinguishes one entity or operation from another entity or operation, without necessarily requiring or implying these entities or behaviour
There are any actual relationship or orders between work.Moreover, the terms "include", "comprise" or its any other variant
It is intended to non-exclusive inclusion, so that including that the process, method, article or equipment of a series of elements not only includes
Those elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of person's equipment.In the absence of more restrictions, the element limited by sentence "including a ...", not
There is also other identical elements in the process, method, article or apparatus that includes the element for exclusion.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention for those of ordinary skill in the art on the basis of the above description can be with
It makes other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to the present invention
The obvious changes or variations extended out of technical solution still in the scope of protection of the present invention.
Claims (10)
1. a kind of power supply switch circuit, which is characterized in that including the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and triode；
The control terminal of first metal-oxide-semiconductor connects external direct current power supply socket, and first end connects battery, and second end connection load supplying connects
Mouthful；The control terminal of second metal-oxide-semiconductor connects the first end of the triode, and first end connects the external direct current power supply and inserts
Mouthful, second end connects the second end of the third metal-oxide-semiconductor；The control terminal of the third metal-oxide-semiconductor connects the first of the triode
End, first end connect load supplying interface；The control terminal of the triode connects the external direct current power supply socket, the second termination
Ground；
First metal-oxide-semiconductor, in response to external direct current power supply socket and external power supply disconnection and be connected and in response to external straight
Flow outlet access external power supply and by；Second metal-oxide-semiconductor and third metal-oxide-semiconductor are led respectively responsive to the access
It is logical and in response to the disconnection and by.
2. power supply switch circuit according to claim 1, which is characterized in that first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third
Metal-oxide-semiconductor is respectively PMOS tube.
3. power supply switch circuit according to claim 2, which is characterized in that the second end and third of second metal-oxide-semiconductor
The second end of metal-oxide-semiconductor is respectively source electrode, and power supply switch circuit further includes first resistor device, and the first end of the first resistor device connects
The source electrode of second metal-oxide-semiconductor is connect, second end connects the first end of the triode.
4. power supply switch circuit according to claim 1, which is characterized in that it further include second resistor, second electricity
The first end of resistance device connects the control terminal of first metal-oxide-semiconductor, second end ground connection.
5. power supply switch circuit according to claim 2, which is characterized in that the external direct current power supply socket is closed type
PWR2.5 socket, the triode be NPN type triode, the first end be collector, the control terminal of first metal-oxide-semiconductor,
The first end of second metal-oxide-semiconductor and the control terminal of the triode are separately connected the 1st pin of closed type PWR2.5 socket.
6. power supply switch circuit according to claim 2, which is characterized in that the external direct current power supply socket is open type
PWR2.5 socket, the triode be PNP type triode, the first end be emitter, the control terminal of first metal-oxide-semiconductor and
The first end of second metal-oxide-semiconductor is separately connected the 1st pin of closed type PWR2.5 socket, the control terminal connection of the triode
3rd pin of open type PWR2.5 socket.
7. power supply switch circuit according to claim 2, which is characterized in that it further include delay circuit, the delay circuit
Input terminal connect the external direct current power supply socket, output end connects the control terminal of the triode.
8. power supply switch circuit according to claim 7, which is characterized in that the delay circuit is RC delay circuit.
9. power supply switch circuit according to claim 2, which is characterized in that it further include second resistor, second electricity
The first end of resistance device connects the control terminal of first metal-oxide-semiconductor, and second end connects the external direct current power supply socket.
10. a kind of electronic equipment, including battery, which is characterized in that further include power supply as claimed in any one of claims 1-9 wherein
Switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811601190.7A CN109474042A (en) | 2018-12-26 | 2018-12-26 | Power supply switch circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811601190.7A CN109474042A (en) | 2018-12-26 | 2018-12-26 | Power supply switch circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109474042A true CN109474042A (en) | 2019-03-15 |
Family
ID=65677003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811601190.7A Pending CN109474042A (en) | 2018-12-26 | 2018-12-26 | Power supply switch circuit and electronic equipment |
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| CN (1) | CN109474042A (en) |
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| US20120153908A1 (en) * | 2010-12-16 | 2012-06-21 | Chi Mei Communication Systems, Inc. | Power management circuit and electronic device employing the same |
| CN204721079U (en) * | 2015-04-20 | 2015-10-21 | 北京航天自动控制研究所 | Dual-power automatic switching and charging circuit |
| CN105828007A (en) * | 2016-06-07 | 2016-08-03 | 深圳市倍儿酷电子商务有限公司 | Audio and video playing device compatible to USB power supply and OTG output functions |
| WO2016180024A1 (en) * | 2015-05-13 | 2016-11-17 | 中兴通讯股份有限公司 | Method and apparatus for achieving switching |
| CN206559133U (en) * | 2017-03-01 | 2017-10-13 | 江西江铃集团新能源汽车有限公司 | Power supply switch circuit |
| CN107425835A (en) * | 2016-05-23 | 2017-12-01 | 中兴通讯股份有限公司 | A kind of on/off circuit |
| CN209267219U (en) * | 2018-12-26 | 2019-08-16 | 歌尔股份有限公司 | Power supply switch circuit and electronic equipment |
-
2018
- 2018-12-26 CN CN201811601190.7A patent/CN109474042A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120153908A1 (en) * | 2010-12-16 | 2012-06-21 | Chi Mei Communication Systems, Inc. | Power management circuit and electronic device employing the same |
| CN204721079U (en) * | 2015-04-20 | 2015-10-21 | 北京航天自动控制研究所 | Dual-power automatic switching and charging circuit |
| WO2016180024A1 (en) * | 2015-05-13 | 2016-11-17 | 中兴通讯股份有限公司 | Method and apparatus for achieving switching |
| CN107425835A (en) * | 2016-05-23 | 2017-12-01 | 中兴通讯股份有限公司 | A kind of on/off circuit |
| CN105828007A (en) * | 2016-06-07 | 2016-08-03 | 深圳市倍儿酷电子商务有限公司 | Audio and video playing device compatible to USB power supply and OTG output functions |
| CN206559133U (en) * | 2017-03-01 | 2017-10-13 | 江西江铃集团新能源汽车有限公司 | Power supply switch circuit |
| CN209267219U (en) * | 2018-12-26 | 2019-08-16 | 歌尔股份有限公司 | Power supply switch circuit and electronic equipment |
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