CN208986674U - Dual power supply automatic switch-over circuit - Google Patents
Dual power supply automatic switch-over circuit Download PDFInfo
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- CN208986674U CN208986674U CN201821759852.9U CN201821759852U CN208986674U CN 208986674 U CN208986674 U CN 208986674U CN 201821759852 U CN201821759852 U CN 201821759852U CN 208986674 U CN208986674 U CN 208986674U
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- pmos
- power supply
- pmos tube
- link together
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- 230000009977 dual effect Effects 0.000 title claims abstract description 9
- 230000000630 rising effect Effects 0.000 claims 1
- 230000010354 integration Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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Abstract
This application involves a kind of dual power supply automatic switch-over circuits, including pair pmos, second pair of PMOS tube, the S1 of pair pmos terminates the first positive pole, the end G1, the end G2 of pair pmos, which link together, is followed by the end D1 to second pair of PMOS tube, the end D2, the end D1, the end D2 of pair pmos, which link together, is followed by the end G1 to second pair of PMOS tube, the end G2, the S1 termination second source anode of second pair of PMOS tube；Pair pmos, second pair of PMOS tube the end S2 link together after as public output anode, connect with the first power cathode, second source cathode to public output.The application compared with prior art, has the following advantages that and effect: small in size, reliable operation；Operating voltage range is relatively wide, is more suitable for now on the market to product fining, the requirement of High Density Integration.
Description
Technical field
This application involves a kind of dual power supply automatic switch-over circuits, are primarily adapted for use in LED battery portable lamp, may be implemented
External adapter input is automatically switched with battery powered two-way power supply.
Background technique
As the market demand of DC power supply and LED illumination lamp is increasing, while to the safety of matched load and equipment
More stringent requirements are proposed for property.Traditional dual power supply switching uses relay, circuit complexity and occupied space.
Summary of the invention
The technical issues of the application solves is to overcome the above deficiencies in the existing technologies, and provide a kind of structure letter
It is clean, small in size, high efficiency, the dual power supply automatic switch-over circuit of reliable operation；Operating voltage range is wide, is more suitable for present city
Product is refined on face, the requirement of High Density Integration.
The application solves technical solution used by above-mentioned technical problem:
A kind of dual power supply automatic switch-over circuit is made of pair pmos, second pair of PMOS tube, first couple of PMOS
The S1 of pipe terminates the first positive pole, and the end G1, the end G2 of pair pmos, which link together, to be followed by the second pair of PMOS tube
The end D1, the end D2, the end D1, the end D2 of pair pmos, which link together, is followed by the end G1 to second pair of PMOS tube, the end G2, and second
The S1 termination second source anode of double PMOS tube；Pair pmos, second pair of PMOS tube the end S2 link together after conduct
Public output anode, connect with the first power cathode, second source cathode to public output.
The application is compared two-way power supply by two double PMOS tube cooperations, it is preferential select output voltage high or
Identical supply voltage responds first power supply and is exported, and another way electricity is rapidly switched to when the power down of power supply all the way in office
Source power supply, so that it is guaranteed that output loading work is reliable and stable.
The application compared with prior art, has the following advantages that and effect: it is few, small in size that circuit simplifies device, high-efficient,
Reliable operation；Operating voltage range is wide, is more suitable for now on the market to product fining, the requirement of High Density Integration.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present application.
Specific embodiment
It is described in further detail with reference to the accompanying drawing and by embodiment to the application, following embodiment is to this Shen
Explanation please and the application is not limited to following embodiment.
Referring to Fig. 1, the present embodiment dual power supply automatic switch-over circuit is by pair pmos Q1, second couple of PMOS tube Q2
Composition, the S(source electrode of pair pmos Q1) 1 termination the first power supply A anode, the G(grid of pair pmos Q1) 1 end, G2
End, which links together, to be followed by draining to the D(of second couple of PMOS tube Q2) 1 end, the end D2, the end D1, the end D2 of pair pmos Q1 connects
It is connected together and is followed by the end G1 to second couple of PMOS tube Q2, the end G2, the S1 termination second source B anode of second couple of PMOS tube Q2；
Pair pmos Q1, second couple of PMOS tube Q2 the end S2 link together after as public output anode OUTPUT, it is public
Output end GND connect with the first power supply A cathode, second source B cathode.
The application passes through double PMOS tube and realizes A, B duplex feeding input, exports powering load by public output.
Width funtion input service principle explanation:
1, the road A supply voltage is greater than the road B supply voltage, when two-way power supply has power supply, the output of the road A power supply；Once the road A is electric
Source power-off, the road B power supply automatically switch to output.
2, similarly, the road B supply voltage is greater than the road A power supply, and the road B power supply preferentially exports；Once the road B power cut-off, the road A
Power supply automatically switches to output.
3, when A, B duplex feeding voltage are equal, which road first responds the just preferential output of which road；It is another after any road power supply power-off
Automatically switch to output all the way outside.
The simple deformation or combination of all present techniques features and technical solution, it is considered that fall into the protection of the application
Range.
Claims (1)
1. a kind of dual power supply automatic switch-over circuit, it is characterized in that: be made of pair pmos, second pair of PMOS tube, the
The S1 of pair pmos terminates the first positive pole, and the end G1, the end G2 of pair pmos, which link together, to be followed by second pair
The end D1, the end D2 of PMOS tube, the end D1, the end D2 of pair pmos link together be followed by the end G1 to second pair of PMOS tube,
The end G2, the S1 termination second source anode of second pair of PMOS tube；Pair pmos, second pair of PMOS tube the end S2 be connected to one
As public output anode after rising, it is connect with the first power cathode, second source cathode to public output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821759852.9U CN208986674U (en) | 2018-10-29 | 2018-10-29 | Dual power supply automatic switch-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821759852.9U CN208986674U (en) | 2018-10-29 | 2018-10-29 | Dual power supply automatic switch-over circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208986674U true CN208986674U (en) | 2019-06-14 |
Family
ID=66789504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821759852.9U Active CN208986674U (en) | 2018-10-29 | 2018-10-29 | Dual power supply automatic switch-over circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208986674U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245287A (en) * | 2018-10-29 | 2019-01-18 | 宁波耀泰电器有限公司 | A kind of dual power supply automatic switch-over circuit |
-
2018
- 2018-10-29 CN CN201821759852.9U patent/CN208986674U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245287A (en) * | 2018-10-29 | 2019-01-18 | 宁波耀泰电器有限公司 | A kind of dual power supply automatic switch-over circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 315400 no.cn8, Far East Industrial City, Yuyao City, Ningbo City, Zhejiang Province Patentee after: Ningbo Yaotai Optoelectronic Technology Co.,Ltd. Country or region after: China Address before: 315400 no.cn8, Far East Industrial City, Yuyao City, Ningbo City, Zhejiang Province Patentee before: Ningbo UTEC Electric Co.,Ltd. Country or region before: China |
|
| CP03 | Change of name, title or address |