CN109617040A - A kind of power supply circuit - Google Patents
A kind of power supply circuit Download PDFInfo
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- CN109617040A CN109617040A CN201811584174.1A CN201811584174A CN109617040A CN 109617040 A CN109617040 A CN 109617040A CN 201811584174 A CN201811584174 A CN 201811584174A CN 109617040 A CN109617040 A CN 109617040A
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- Prior art keywords
- switch
- power supply
- transistor
- power
- input
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the present invention provides a kind of power supply circuit, including the first power input, second source input terminal, first switch, second switch and control circuit, the control circuit selects first switch and the second switch conducting according to the validity of first power input and the second source input terminal, thus, different power supplys can be switched to load supplying, improve the reliability and usability of power supply circuit, and reduce the loss of circuit, improve the efficiency of circuit, simultaneously, the power supply circuit construction of the embodiment of the present invention is simple, it is easy to accomplish.
Description
Technical field
The present embodiments relate to electron electric power technical fields, more particularly, to a kind of power supply circuit.
Background technique
Currently, fractional load needs to keep data communication in use, wherein common communication interface includes USB
Interface etc..USB interface has taken into account power supply and communication function.Since the power consumption of fractional load itself is larger, USB interface is individually used
Power supply is it cannot be guaranteed that therefore load global function operation usually increases an external power supply power supply power supply port to load, to use
Dual power supply is to load supplying.It but using the efficiency and switching problem of dual power supply is urgently solved in dual power supply field
Certainly the problem of.
Summary of the invention
The embodiment of the present invention provides a kind of power supply circuit as a result, to realize that switching different power supplys powers to equipment, improves
The reliability and usability of power supply circuit, and the loss of circuit is reduced, improve the efficiency of circuit.
In a first aspect, the embodiment of the present invention provides a kind of power supply circuit, the circuit includes:
First power input；
Second source input terminal；
Output end；
First switch is coupled between first power input and the output end；
Second switch is coupled between the second source input terminal and the output end；And
Control circuit is configured to respond to the validity of first power input and the second source input terminal
The first switch or second switch is selected to be connected.
Further, the control circuit is configured to respond to first power input there are effective input powers
When control that the first switch is in the conductive state, and the second switch is in an off state.
Further, it is electric there is no effectively inputting to be configured to respond to first power input for the control circuit
Source, and the second source input terminal is there are effective input power, it is in an off state to control the first switch, and described second
It switchs in the conductive state.
Further, the control circuit includes the first transistor, and the first transistor is configured as controlling described
The switch state of one switch.
Further, the first switch is p-type metal-oxide-semiconductor, and the first transistor is N-type metal-oxide-semiconductor；
The first transistor is coupled between the grid and ground terminal of the first switch, the grid of the first transistor
Pole is pulled to first power input.
Further, the control circuit includes second transistor and third transistor, the second transistor and third
Transistor is configured as controlling the switch state of the second switch.
Further, the second switch is p-type metal-oxide-semiconductor, and the second transistor and third transistor are N-type MOS
Pipe；
The second transistor is coupled between the grid and ground terminal of the second switch, the grid of the second transistor
Pole is pulled to the second source input terminal, the third transistor be coupled in the second transistor grid and ground terminal it
Between, the grid of the third transistor is pulled to first power input.
Further, corresponding first power supply of first power input is external power supply power supply, the second source
The corresponding second source of input terminal is USB power supply.
The power supply circuit of the embodiment of the present invention includes the first power input, second source input terminal, first switch, second
Switch and control circuit, the control circuit is according to the validity of first power input and the second source input terminal
First switch and the second switch conducting is selected, powers thus, it is possible to switch different power supplys to equipment, improves power supply circuit
Reliability and usability, and the loss of circuit is reduced, the efficiency of circuit is improved, meanwhile, the confession of the embodiment of the present invention
Electric circuit structure is simple, it is easy to accomplish.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the circuit diagram of the power supply circuit of the prior art；
Fig. 2 is the tube voltage drop of the diode in the power supply circuit of the prior art with the schematic diagram of curent change；
Fig. 3 is the schematic diagram of the power supply circuit of the embodiment of the present invention.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
Text is detailed to describe some specific detail sections in datail description of the invention.Do not have for a person skilled in the art
The present invention can also be understood completely in the description of these detail sections.In order to avoid obscuring essence of the invention, well known method, mistake
There is no narrations in detail for journey, process, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through electrically by least one element or sub-circuit
The galvanic circle that connection or electromagnetism connect and compose.When title element or the " connection of another element of circuit " being connected to " or element/circuit
" between two nodes when, it, which can be, is directly coupled or connected another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " directly connecting
Be connected to " another element when, it is meant that the two be not present intermediary element.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it is to be understood that, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
It is two or more.
Fig. 1 is the circuit diagram of the power supply circuit of the prior art.As shown in Figure 1, the power supply circuit of the prior art includes outside
Power supply input terminal i1, USB power supply input terminal i2, diode D1, diode D2 and output end o1 (namely the electricity of load
Source input terminal).Diode D1 is connected between external power supply power input i1 and output end o1.Diode D2 is connected to USB
Between input terminal i2 and output end o1.
Wherein, diode D1 and diode D2 form OR circuit 11 so that external power supply power input i1 and/or
USB power supply input terminal i2 powers to output end o1.That is, in external power supply input terminal i1, there are external power supplies
Power supply, when USB power supply is not present in USB power supply input terminal i2, OR circuit 11 makes external power supply power supply to load
Power supply.External power supply power supply is not present in external power supply input terminal i1, there are USB power supplies by USB power supply input terminal i2
When power supply, OR circuit 11 makes USB power supply powering load.In external power supply input terminal i1, there are external power supplies
There is also when USB power supply, OR circuit 11 makes external power supply power supply and USB power for power supply, USB power supply input terminal
Power supply while powering load.The prior art can not achieve external power supply power supply and the switching power supply of USB power supply as a result, together
When, tube voltage drop of the diode in conducting is larger, and can increase with the increase of electric current, this makes the voltage of output end o1
It can fluctuate less than supply voltage and with the variation of electric current, so that the supply voltage for causing power supply circuit is unstable, and
With biggish loss, the power supply efficiency of power supply circuit is reduced.
Fig. 2 is the tube voltage drop of the diode in the power supply circuit of the prior art with the schematic diagram of curent change.Such as Fig. 2 institute
Show, when the electric current Id for flowing through diode reaches 100mA, the tube voltage drop Vd of diode is about 0.6V, is flowing through diode
When electric current Id reaches 1000mA, the tube voltage drop Vd of diode is more than 1V.Therefore, when system global function is run, biggish electric current
Meeting causes the electricity of external power supply power input i1 and/or USB power supply input terminal i2 so that the tube voltage drop of diode is larger
Pressure cannot all supply load namely power supply circuit output end o1 voltage be less than external power supply power input i1 and/or
The voltage of USB power supply input terminal i2.Also, since the tube voltage drop of diode changes with curent change, negative
When the changed power of load, the voltage of the output end o1 of power supply circuit will appear fluctuation, and lower and unstable supply voltage can make
The power supply instability that must be loaded, which increase the probability of the job insecurity of load.Simultaneously as flow through the electric current of diode compared with
Greatly, the power of diode own loss is also bigger, thus cause the power supply efficiency of load lower, and diode fever is serious,
The service life of diode may be reduced.
Fig. 3 is the schematic diagram of the power supply circuit of the embodiment of the present invention.As shown in figure 3, the power supply circuit 3 of the present embodiment includes
First power input i3, second source input terminal i4, output end o2, first switch S1, second switch S2 and control circuit 31.
Wherein, first switch S1 is coupled between the first power input i3 and output end o2.First switch S1 is in the first power input
Holding i3, there are conductings controlled when effective input power, so that the corresponding effective input power of the first power input i3 is to load
Power supply.Second switch S2 is coupled between second source input terminal i4 and output end o2.Second switch S2 is inputted in second source
It holds i4 there are effective input power and controlled conducting when effective input power is not present in the first power input i3, so that second
The corresponding effective input power powering load of power input i4.Control circuit 31 is configured to respond to the first power input
Hold validity (namely whether there are effect input powers) selection first switch S1 or second of i3 and second source input terminal i4
Switch S2 conducting.
In an optional implementation manner, corresponding first power supply of the first power input i3 is external power supply power supply.
The corresponding second source of second source input terminal i4 is USB power supply.In the present embodiment, system can be current by detecting
Effective input power be external power supply power supply or USB power supply, and load is adjusted according to current effective input power
Operation power.Wherein, when external power supply is effective input power, system can be run with global function.It powers in USB electric
When source is effective input power, the underpower that can be provided due to USB power supply so that system global function is run,
Need to limit the power of load, to guarantee that system can operate normally.It is readily appreciated that, closes the input of USB power supply, not
Influence the communication function of USB.
In the present embodiment, control circuit 31 is configured to respond to the first power input i3 in the presence of effectively input electricity
Source, control first switch S1 is in the conductive state, and control second switch S2 is in an off state, so that the first power input
The corresponding effective input power of i3 is load supplying.Control circuit 31 is additionally configured to not deposit in response to the first power input i3
In effective input power, and there are effective input powers by second source input terminal i4, and control first switch S1 is in an off state,
It is in the conductive state to control second switch S2, so that the corresponding effective input power of second source input terminal i4 is that load supplies
Electricity.Since external power supply power supply is enough to support the global function of system to run, and the underpower that USB power supply can be provided with
Meet the power demands of system, therefore, in the presence of external power supply, so that external input power powering load is to guarantee
The power demands of system, and make system that the input of USB power supply be automatically closed.
As shown in figure 3, in the present embodiment, first switch S1 is p-type metal-oxide-semiconductor (MOS memory).
Control circuit 31 includes the first transistor Q1.Wherein, the first transistor Q1 is configured as according to the defeated of the first power input i3
Enter the switch state of voltage control first switch S1.First switch S1 be coupled in the first power input i3 and output end o2 it
Between.The first transistor Q1 is coupled between the grid and ground terminal of first switch S1.The grid of the first transistor Q1 is pulled to
One power input i3.In an optional implementation manner, control circuit 31 further includes first resistor R1 and second resistance R2.
First resistor R1 is coupled between the first power input i3 and the grid of the first transistor Q1.Second resistance R2 is coupled in first
Between the grid and output end o2 of switch S1.For the present embodiment using first switch S1 as p-type metal-oxide-semiconductor, the first transistor Q1 is N-type
It is described for metal-oxide-semiconductor.Wherein, the drain electrode of first switch S1 is coupled to the first power input i3, the source of first switch S1
Pole is coupled to output end o2.The drain electrode of the first transistor Q1 is coupled to the grid of first switch S1, the drain electrode of the first transistor Q1
It is coupled to ground terminal.
In the first power input i3 there are when effective input power, due to the presence of first resistor R1, so that first is brilliant
Body pipe Q1 gate source voltage (namely the first transistor Q1 grid voltage and source voltage pressure difference) meet the first transistor Q1
Turn-on condition so that the first transistor Q1 be connected.Due to the first transistor Q1 be coupled in first switch S1 grid and
Between ground terminal, therefore, in the first transistor Q1 conducting, the grid voltage of first switch S1 is 0.Also, in the first power supply
For input terminal i3 there are when effective input power, the electric current of generation flows through the body diode of first switch S1, simultaneously because the second electricity
The presence of R2 is hindered, so that the source voltage of first switch S1 is gradually increased, until meeting the gate source voltage of first switch S1
Its turn-on condition, so that first switch S1 is connected, the corresponding effective input power of the first power input i3 is that load supplies
Electricity.It is readily appreciated that, in the present embodiment, first switch S1 is p-type metal-oxide-semiconductor, and the first transistor Q1 is N-type metal-oxide-semiconductor, therefore, the
For the gate source voltage of one switch S1 less than 0, the gate source voltage of the first transistor Q1 is greater than 0.Due to the DC impedance after metal-oxide-semiconductor conducting
Minimum (generally tens milliohms), therefore, in the present embodiment, even if the changed power of load is very big, the pipe pressure of metal-oxide-semiconductor conducting
Drop still very little, thereby it is ensured that the stability of power supply, reduces the loss of metal-oxide-semiconductor itself, improve power supply efficiency.
In the present embodiment, second switch S1 is p-type metal-oxide-semiconductor.Control circuit 31 further includes second transistor Q2.Wherein,
Second transistor Q2 is configured as controlling the switch state of second switch S2 according to the input voltage of second source input terminal i4.The
Two switch S2 are coupled between second source input terminal i4 and output end o2.Second transistor Q2 is coupled in the grid of second switch S2
Between pole and ground terminal.The grid of second transistor Q2 is pulled to second source input terminal i4.In a kind of optional implementation
In, control circuit 31 further includes 3rd resistor R3 and the 4th resistance R4.3rd resistor R3 be coupled in second source input terminal i4 and
Between the grid of second transistor Q2.4th resistance R4 is coupled between the grid of second switch S2 and output end o2.This implementation
Example is using second switch S2 as p-type metal-oxide-semiconductor, and second transistor Q2 is is described for N-type metal-oxide-semiconductor.Wherein, second switch S2
Drain electrode is coupled to second source input terminal i4, and the source electrode of second switch S2 is coupled to output end o2.The drain electrode of second transistor Q2
It is coupled to the grid of second switch S2, the drain electrode of second transistor Q2 is coupled to ground terminal.
Control circuit 31 further includes third transistor Q3 and the 5th resistance R5.Wherein, third transistor Q3 is coupled in second
Between the grid and ground terminal of transistor Q2, the grid of third transistor Q3 is pulled to the first power input by resistance R5
i3.In the present embodiment, third transistor Q3 is N-type metal-oxide-semiconductor.As shown in Figure 3, it is assumed that switch S1 is in an off state at this time,
Switch S2 it is in the conductive state (namely at this time the first power input i3 be not present effective input power, second source input terminal
There are effective input powers by i4), at a certain moment later, corresponding first power supply of the first power input i3 starts effectively,
Namely first power input i3 there are effective input powers, then due to the presence of resistance R5, the grid source electricity of third transistor Q3
Pressure progressivelyes reach its turn-on condition and is connected.In third transistor Q3 conducting, so that the grid voltage of second transistor Q2 is
0, second transistor Q2 controlled shutdown, so that second switch S2 is turned off.Meanwhile control circuit 31 is defeated in response to the first power supply
Entering to hold i3, there are the control first switch S1 conductings of effective input power.There is effectively input in the first power input i3 as a result,
When power supply, the corresponding effective input power powering load of the first power input i3, and second switch S2 is turned off, to close
Close the power input of second source input terminal i4.
Effective input power is not present in response to the first power input i3, the third transistor Q3 in control circuit 31 by
Control shutdown, so that third transistor Q3 no longer clamps down on the switch of second transistor Q2.At this point, if second source input terminal
There are effective input power, the then controlled conductings of second transistor Q2 by i4, so that second switch S2 conducting is controlled, so that the second electricity
The corresponding effective input power powering load of source input terminal i4.
Specifically, effective input power namely third transistor Q3 controlled shutdown is not present in the first power input i3
When, if second source input terminal i4 there are effective input power, due to the presence of 3rd resistor R3, so that second transistor Q2
Gate source voltage (namely second transistor Q2 grid voltage and source voltage pressure difference) meet the conducting item of second transistor Q2
Part, so that second transistor Q2 is connected.Due to second transistor Q2 be coupled in second switch S2 grid and ground terminal it
Between, therefore, in second transistor Q2 conducting, the grid voltage of second switch S2 is 0.Also, in second source input terminal i4
There are when effective input power, the electric current of generation flows through the body diode of second switch S2, simultaneously because the 4th resistance R4's deposits
So that the source voltage of second switch S2 is gradually increased, until making the gate source voltage of second switch S2 meet it is connected item
Part, so that second switch S2 is connected, the corresponding effective input power of second source input terminal i4 starts to supply to load
Electricity.It is readily appreciated that, in the present embodiment, second switch S2 is p-type metal-oxide-semiconductor, and second transistor Q2 is N-type metal-oxide-semiconductor, therefore, the
For the gate source voltage of two switch S2 less than 0, the gate source voltage of second transistor Q2 is greater than 0.Due to the DC impedance after metal-oxide-semiconductor conducting
Minimum (generally tens milliohms), therefore, in the present embodiment, even if the changed power of load is very big, the pipe pressure of metal-oxide-semiconductor conducting
Drop still very little, thereby it is ensured that the stability of power supply, reduces the loss of metal-oxide-semiconductor itself, improve power supply efficiency.
The present embodiment selects first switch and second according to the validity of the first power input and second source input terminal
Switch conduction improves the reliability and usability of power supply circuit thus, it is possible to switch different power supplys to load supplying,
And the loss for reducing circuit improves the efficiency of circuit, meanwhile, the power supply circuit construction of the embodiment of the present invention is simple, easily
In realization.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For, the invention can have various changes and changes.All any modifications made within the spirit and principles of the present invention are equal
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of power supply circuit, which is characterized in that the circuit includes:
First power input；
Second source input terminal；
Output end；
First switch is coupled between first power input and the output end；
Second switch is coupled between the second source input terminal and the output end；And
Control circuit is configured to respond to the validity selection of first power input and the second source input terminal
The first switch or second switch conducting.
2. power supply circuit according to claim 1, which is characterized in that the control circuit is configured to respond to described
One power input is in the conductive state there are the first switch is controlled when effective input power, and the second switch, which is in, to close
Disconnected state.
3. power supply circuit according to claim 1, which is characterized in that the control circuit is configured to respond to described
One power input is not present effective input power, and the second source input terminal is there are effective input power, described in control
First switch is in an off state, and the second switch is in the conductive state.
4. power supply circuit according to claim 1, which is characterized in that the control circuit includes the first transistor, described
The first transistor is configured as controlling the switch state of the first switch.
5. power supply circuit according to claim 4, which is characterized in that the first switch be p-type metal-oxide-semiconductor, described first
Transistor is N-type metal-oxide-semiconductor；
The first transistor is coupled between the grid and ground terminal of the first switch, on the grid of the first transistor
It is pulled to first power input.
6. power supply circuit according to claim 1, which is characterized in that the control circuit includes second transistor and third
Transistor, the second transistor and third transistor are configured as controlling the switch state of the second switch.
7. power supply circuit according to claim 6, which is characterized in that the second switch be p-type metal-oxide-semiconductor, described second
Transistor and third transistor are N-type metal-oxide-semiconductor；
The second transistor is coupled between the grid and ground terminal of the second switch, on the grid of the second transistor
It is pulled to the second source input terminal, the third transistor is coupled between the grid and ground terminal of the second transistor,
The grid of the third transistor is pulled to first power input.
8. power supply circuit described in any one of -7 according to claim 1, which is characterized in that first power input is corresponding
The first power supply be external power supply power supply, the corresponding second source of the second source input terminal is USB power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811584174.1A CN109617040A (en) | 2018-12-24 | 2018-12-24 | A kind of power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811584174.1A CN109617040A (en) | 2018-12-24 | 2018-12-24 | A kind of power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109617040A true CN109617040A (en) | 2019-04-12 |
Family
ID=66011773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811584174.1A Pending CN109617040A (en) | 2018-12-24 | 2018-12-24 | A kind of power supply circuit |
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| Country | Link |
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| CN (1) | CN109617040A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111130344A (en) * | 2019-12-18 | 2020-05-08 | 上海空间电源研究所 | Space microsecond level pulse power supply circuit |
| CN111769541A (en) * | 2020-07-29 | 2020-10-13 | 深圳市绿联科技有限公司 | Power supply circuit, terminal accessory and method for preventing voltage backflow |
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| CN202906569U (en) * | 2012-11-29 | 2013-04-24 | 威胜集团有限公司 | Internal and external power-supply switching circuit for electric energy meter |
| CN204205704U (en) * | 2014-10-28 | 2015-03-11 | 上海斐讯数据通信技术有限公司 | A kind of power selection circuit |
| CN205595888U (en) * | 2016-04-25 | 2016-09-21 | 深圳赤马通信技术有限公司 | Activestandby power supply switching circuit |
| CN106648008A (en) * | 2016-12-13 | 2017-05-10 | 曙光信息产业(北京)有限公司 | Power supply system of blade server |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202906569U (en) * | 2012-11-29 | 2013-04-24 | 威胜集团有限公司 | Internal and external power-supply switching circuit for electric energy meter |
| CN204205704U (en) * | 2014-10-28 | 2015-03-11 | 上海斐讯数据通信技术有限公司 | A kind of power selection circuit |
| CN205595888U (en) * | 2016-04-25 | 2016-09-21 | 深圳赤马通信技术有限公司 | Activestandby power supply switching circuit |
| CN106648008A (en) * | 2016-12-13 | 2017-05-10 | 曙光信息产业(北京)有限公司 | Power supply system of blade server |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111130344A (en) * | 2019-12-18 | 2020-05-08 | 上海空间电源研究所 | Space microsecond level pulse power supply circuit |
| CN111769541A (en) * | 2020-07-29 | 2020-10-13 | 深圳市绿联科技有限公司 | Power supply circuit, terminal accessory and method for preventing voltage backflow |
| CN111769541B (en) * | 2020-07-29 | 2022-03-15 | 深圳市绿联科技股份有限公司 | Power supply circuit, terminal accessory and method for preventing voltage backflow |
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Application publication date: 20190412 |