CN201608555U - Automatic switchover circuit of electric power supply - Google Patents
Automatic switchover circuit of electric power supply Download PDFInfo
- Publication number
- CN201608555U CN201608555U CN2009202724074U CN200920272407U CN201608555U CN 201608555 U CN201608555 U CN 201608555U CN 2009202724074 U CN2009202724074 U CN 2009202724074U CN 200920272407 U CN200920272407 U CN 200920272407U CN 201608555 U CN201608555 U CN 201608555U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The utility model discloses an automatic switchover circuit of an electric power supply. The automatic switchover circuit comprises a first power input end, a second power input end, a switchover module and an output end, wherein the first power input end is the local DC supply input, one path of the first power input end is directly connected with the output end, and the other path thereof is connected with a first input end of the switchover module; the second power input end is connected with a second input end of the switchover module; the output of the switchover module is connected with the output end; and the switchover module has not output when the first power input end has input. The output priority of the first power input end is higher than that of the second power input end. The automatic switchover circuit can not be limited to the switchover selection of the local power supply and the POE power supply and can be expanded to the occasions with the similar switchover selection of two paths of power supply, so as to realize the automatic switchover of two power supplies. The automatic switchover circuit is simple and practical, has the advantages of low cost and high reliability and has the functions of power-up buffering of the power supply voltage, overcurrent protection, reverse-connection protection, filter and noise isolation and the like.
Description
Technical field
The utility model relates to a kind of automatic switch-over circuit of power supply.
Background technology
At present at ONU (the OpticalNetwork Unit in GPON/EPON (Gigabit-Capable Passive Optical Network/Ethernet Passive Optical Network) optical communication Access Network field, optical network unit) in the power supply of the 48V power supply of equipment, commonly used have power supplied locally and a Power over Ethernet (POE, Power over Ethernet) dual mode, most equipment all only adopt a kind of supply power mode wherein.POE power supply is a kind of technology that the required electric energy of ONU equipment can be provided by the grid line in the Ethernet, makes original grid line both can the Data transmission data, can also work as the power line use.Generally speaking, use the equipment of Power over Ethernet not need to obtain electric energy from power supplied locally again, still, in some cases, such as the Power over Ethernet module damage of ONU equipment, perhaps, still need from the power taking of power supplied locally power supply under the situations such as technical staff's debugging maintenance convenience.But support POE when power supply again when equipment, both power simultaneously and will have issue of priority, promptly will guarantee preferentially from power supplied locally, and can automatically switch to the POE power supply after local power supply cuts off the power supply, and can not cause any service disconnection.In addition, need between off-gauge POE power supply or other power supplys and direct current supply, switch under the certain situation, and guarantee the high priority of direct current supply.
Application number is that 200710186392.5 patent has proposed a kind of power transfer device between POE power supply and local direct current supply, but the present invention can only be used for the switching between POE power supply and the direct current supply, can not realize the switching between non-POE reference power supply and the direct current supply, and circuit is complicated, and cost is higher.
Summary of the invention
The technical problems to be solved in the utility model is: at the deficiencies in the prior art, a kind of automatic switch-over circuit of power supply is provided, can realize two kinds of automatic switchovers between the power supply, a kind of power supply is a dc power supply, another kind of power supply can be a standard P OE power supply, or off-gauge POE power supply or other power supplys, and guarantee that dc power supply has high priority, and circuit is simpler, cost is lower.
The technical solution of the utility model is: a kind of automatic switch-over circuit of power supply, comprise first power input, second source input, handover module and output, described first power input is local direct current supply input, one the tunnel directly connects output, another road connects the first input end of handover module, described second source input connects second input of handover module, the output of handover module connects output, and when first power input has input, the handover module no-output.
More detailed technical scheme of the present utility model is:
Described handover module comprises first device, second device and the 3rd device that links to each other successively; First power input connects the input of first device, and the input of second device connects the output of first device, and the first input end of the 3rd device connects the output of second device, and second input of the 3rd device connects the second source input.
At described second source input input is arranged, when first power input does not have input, described first device ends, second break-over of device, the 3rd break-over of device, handover module has output; When first power input has input, described first break-over of device, second device ends, and the 3rd device ends, the handover module no-output.
In the switching selection course of first power input and second source input, guarantee that the priority of first power input is higher than the second source input.
First device of described handover module is an optocoupler, and second device and the 3rd device are respectively triode and field effect transistor.
The positive pole of the light-emitting diode of described optocoupler connects first power input, the positive pole of feedback light electric diode connects the base stage of triode, the collector electrode of triode connects the grid of field effect transistor, and the source electrode of field effect transistor connects the second source input, and drain electrode connects output.
Described second input is standard P OE power supply or non-standard POE power supply, perhaps other forms of power supply.
Also be connected with overcurrent fuse protection circuit and filtering and eliminating noise circuit between described first power input, second source input and the output.
The utility model has the advantages that: this utility model is not limited to the switching of local power supply and POE power supply and selects, can expand to and much similarly exist the two-way power supply to switch the occasion of selection problem, can realize two kinds of automatic switchovers between the power supply, a kind of power supply is a dc power supply, another kind of power supply can be a standard P OE power supply, or off-gauge POE power supply or other power supplys, and guarantee that dc power supply has high priority.Circuit module of the present utility model is simple and practical; cost is low; and reliability height; have the supply voltage functions such as buffering, overcurrent protection, anti-reverse protection, filtering, noise isolation that power on; can be applied to the production in enormous quantities of ONU equipment, high cost performance is arranged, have the higher utility of ratio; and this circuit also can be extended in the switch product, is of wide application.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is the structured flowchart of embodiment of the present utility model;
Fig. 2 is the circuit theory diagrams of embodiment of the present utility model;
Fig. 3 is the transformation circuit theory diagrams partly of the circuit rear end of embodiment of the present utility model.
Wherein: 1 first power input; 2 second source inputs; 3 handover modules; 31 first devices; 32 second devices; 33 the 3rd devices; 4 outputs.
Embodiment
Embodiment: as shown in Figure 1, the automatic switch-over circuit of the power supply of present embodiment comprises first power input 1, second source input 2, handover module 3 and output 4.First power input 1 is local direct current supply input, one the tunnel directly connects output 4, another road connects the first input end of handover module 3, the second source input connects second input of handover module 3, the output of handover module 3 connects output 4, and when the first power input LOCAL_IN had input, handover module 3 no-outputs were to guarantee the high priority of first power input.
In the present embodiment, second source input 2 can be standard P OE power supply or non-standard POE power supply, perhaps other forms of power supply.
Described handover module 3 comprises first device 31, second device 32 and the 3rd device 33 that links to each other successively, the input of second device 32 connects the output of first device 31, the first input end of the 3rd device 33 connects the output of second device 32, and second input of the 3rd device 33 connects second source input 2.
When second source input Second_IN input is arranged, when the first power input LOCAL_IN does not have input, described first device 31 ends, 32 conductings of second device, 33 conductings of the 3rd device, handover module 3 has output, the electric energy of output second source input Second_IN.When the first power input LOCAL_IN has input, 31 conductings of first device, second device 32 ends.No matter whether second source input 2 has input Second_IN ends the 3rd device 33 all the time, thus handover module 3 no-outputs, and only powered to output by first power input this moment.
Be illustrated in figure 2 as the physical circuit schematic diagram of present embodiment.First device 31 of the handover module 3 of present embodiment is an optocoupler, and second device 32 and the 3rd device 33 are respectively triode and field effect transistor.More specifically, first device 31 of present embodiment is optocoupler U41, and second device 32 is NPN type triode Q8, and the 3rd device 33 is P type field effect transistor Q7.The positive pole of the light-emitting diode of optocoupler U41 connects first power input 1 by a resistance R 419, the positive pole of feedback light electric diode connects the base stage of triode Q8 by a resistance R 503, connect the source electrode of field effect transistor Q7 simultaneously by resistance R 421, light-emitting diode is connected virtual earth with the negative pole of feedback light electric diode.The collector electrode of triode Q8 is by the grid of resistance R 420 connection field effect transistor Q7, and shunt capacitance C408 between the collector and emitter is in series with resistance R 422 between the source electrode of the collector electrode of triode and field effect transistor Q7.The source electrode of field effect transistor Q8 is connected to second source input 2 by the fuse F1 of an overcurrent fuse protection, is parallel with capacitor C 407 between its source electrode and the virtual earth, is used for filtering.The drain electrode of field effect transistor Q8 is connected to output 3 by the diode D11 of an anti-reverse protection.
In addition, also be connected with disconnected protective circuit of overcurrent and filtering and eliminating noise circuit between first power input 1 and the output 4.Particularly; comprise the fuse F2 with overcurrent fuse protection function, shunt capacitance C422 with filtering pooling feature; between power supplied locally power supply and ground, all be connected with magnetic bead FB1 and FB2; play filtering, every the effect of making an uproar; to guarantee the noise jamming between the pure stable of power supply power supply and reduction two-way power supply, after magnetic bead FB1, be connected with diode D2 and be used for anti-reverse protection.The first via output of first power input 1 links to each other with the output of handover module 3, be parallel with the big capacitor C 1 of polarity energy storage to virtual earth, level and smooth in order to guarantee the power supply input, the first via output and the outputing to of handover module 3 of first power input 1 also are connected with common mode inductance L2 between the output, being used to suppress common-mode noise disturbs, also be parallel with the big capacitor C 436 of energy storage in addition, guarantee behind power cut-off, can also can improve the interference rejection ability of system simultaneously in short-term to system's power supply.
When not having the second source input as local power supply, local power supply is directly by diode D2 process common mode inductance L2 noise reduction powering load; When existing local power supply has second source again, optocoupler U41 conducting, triode Q8 ends owing to base potential is very low, thereby the grid potential of P type field effect transistor Q7 is approximately equal to its source potential, therefore field effect transistor Q7 also is in cut-off state, do not have electric current among the diode D11, supply power mode at this moment still is a local power supply; When second source being arranged when no local power supply, not conducting of optocoupler U41, triode Q8 base stage is a high voltage, the triode conducting, field effect transistor Q7 conducting, thus there is electric current to flow through among the diode D11, realize the second source power supply.When optocoupler U41 conducting, the resistance R 419 in the circuit, R421 are current-limiting resistance; When field effect pipe Q7 and the equal conducting of triode Q8, the resistance R 420 in the circuit plays metering function.In field effect transistor Q7 conducting with by the moment of switching mutually, capacitor C 408 can play cushioning effect in addition, and the better protect transistor prevents that moment impact is excessive.
Fig. 3 is the circuit theory diagrams of the transformation part of circuit rear end, and the chip U75 of process transformation part becomes the required voltage of circuit working with the voltage transitions of output 4, and as magnitudes of voltage such as 3.3V, 5V, this is than mature technique.
The voltage of the two-way power input of present embodiment is of wide application, the voltage of first power input can be higher than the second source input, also can be lower than the second source input, first power input and second source input can be the power supplys of 48V, also can be the 12V power supply, or the power supply of other voltages.
The above only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented with this, and all simple conversion of doing according to the utility model claim and description all should still belong to protection range of the present utility model.
Claims (8)
1. the automatic switch-over circuit of a power supply, comprise first power input (1), second source input (2), handover module (3) and output (4), it is characterized in that: described first power input (1) is local direct current supply input, one the tunnel directly connects output (4), another road connects the first input end of handover module (3), described second source input connects second input of handover module (3), the output of handover module (3) connects output (4), and at first power input (1) when input is arranged, handover module (3) no-output.
2. according to the automatic switch-over circuit of the power supply described in the claim 1, it is characterized in that: described handover module (3) comprises first device (31), second device (32) and the 3rd device (33) that links to each other successively; First power input (1) connects the input of first device (31), the input of second device (32) connects the output of first device (31), the first input end of the 3rd device (33) connects the output of second device (32), and second input of the 3rd device (33) connects second source input (2).
3. according to the automatic switch-over circuit of the power supply described in the claim 2, it is characterized in that: have input, first power input (1) not to have when input at described second source input (2), described first device (31) ends, second device (32) conducting, the 3rd device (33) conducting, handover module (3) has output; At first power input (1) when input is arranged, described first device (31) conducting, second device (32) ends, and the 3rd device (33) ends, handover module (3) no-output.
4. according to the automatic switch-over circuit of the power supply described in the claim 1, it is characterized in that: the output priority of first power input (1) is higher than second source input (2).
5. want the automatic switch-over circuit of the power supply described in 2 according to right, it is characterized in that: first device (31) of described handover module (3) is an optocoupler, and second device (32) is a triode, and the 3rd device (33) is a field effect transistor.
6. according to the automatic switch-over circuit of the power supply described in the claim 5, it is characterized in that: the positive pole of the light-emitting diode of described optocoupler connects first power input (1), the positive pole of feedback light electric diode connects the base stage of triode, the collector electrode of triode connects the grid of field effect transistor, the source electrode of field effect transistor connects second source input (2), and drain electrode connects output.
7. according to the automatic switch-over circuit of the power supply described in the claim 1, it is characterized in that: described second input is standard P OE power supply or non-standard POE power supply.
8. according to the automatic switch-over circuit of the power supply described in the claim 1, it is characterized in that: also be connected with overcurrent fuse protection circuit and filtering and eliminating noise circuit between described first power input (1), second source input (2) and the output (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202724074U CN201608555U (en) | 2009-11-18 | 2009-11-18 | Automatic switchover circuit of electric power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202724074U CN201608555U (en) | 2009-11-18 | 2009-11-18 | Automatic switchover circuit of electric power supply |
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| Publication Number | Publication Date |
|---|---|
| CN201608555U true CN201608555U (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202724074U Expired - Lifetime CN201608555U (en) | 2009-11-18 | 2009-11-18 | Automatic switchover circuit of electric power supply |
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| CN (1) | CN201608555U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497276A (en) * | 2011-12-20 | 2012-06-13 | 青岛海信网络科技股份有限公司 | Power source conversion circuit and network camera with same |
| CN103427473A (en) * | 2012-05-23 | 2013-12-04 | 智邦科技股份有限公司 | Power management method and power management device |
| CN105847015A (en) * | 2016-03-21 | 2016-08-10 | 上海斐讯数据通信技术有限公司 | Power supply control system for solar router, solar router and network device |
| CN107425598A (en) * | 2017-09-12 | 2017-12-01 | 上海剑桥科技股份有限公司 | The power selection circuit powered for adapter and POE |
| CN110994973A (en) * | 2019-11-08 | 2020-04-10 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN111181359A (en) * | 2020-02-27 | 2020-05-19 | 北京交大思诺科技股份有限公司 | Novel LKJ power plug-in |
-
2009
- 2009-11-18 CN CN2009202724074U patent/CN201608555U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497276A (en) * | 2011-12-20 | 2012-06-13 | 青岛海信网络科技股份有限公司 | Power source conversion circuit and network camera with same |
| CN102497276B (en) * | 2011-12-20 | 2015-06-24 | 青岛海信网络科技股份有限公司 | Power source conversion circuit and network camera with same |
| CN103427473A (en) * | 2012-05-23 | 2013-12-04 | 智邦科技股份有限公司 | Power management method and power management device |
| CN103427473B (en) * | 2012-05-23 | 2016-01-06 | 智邦科技股份有限公司 | power management method and power management device |
| CN105847015A (en) * | 2016-03-21 | 2016-08-10 | 上海斐讯数据通信技术有限公司 | Power supply control system for solar router, solar router and network device |
| CN107425598A (en) * | 2017-09-12 | 2017-12-01 | 上海剑桥科技股份有限公司 | The power selection circuit powered for adapter and POE |
| CN110994973A (en) * | 2019-11-08 | 2020-04-10 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN110994973B (en) * | 2019-11-08 | 2021-08-17 | 苏州浪潮智能科技有限公司 | Power supply and server |
| CN111181359A (en) * | 2020-02-27 | 2020-05-19 | 北京交大思诺科技股份有限公司 | Novel LKJ power plug-in |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101013 |