CN202513668U - Switching circuit for direct-current power supplies - Google Patents
Switching circuit for direct-current power supplies Download PDFInfo
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- CN202513668U CN202513668U CN2012201907915U CN201220190791U CN202513668U CN 202513668 U CN202513668 U CN 202513668U CN 2012201907915 U CN2012201907915 U CN 2012201907915U CN 201220190791 U CN201220190791 U CN 201220190791U CN 202513668 U CN202513668 U CN 202513668U
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Abstract
The embodiment of the utility model discloses a switching circuit for direct-current power supplies, which comprises a main power supply, an auxiliary power supply and a switching switch circuit, wherein the switching switch circuit comprises a first diode and a second diode, the positive pole of the first diode is connected with the output end of the main power supply, the positive pole of the second diode is connected with the output end of the auxiliary power supply, and the negative poles of the first diode and the second diode are connected with the input end of a load. The switching circuit for the direct-current power supplies is used for quickly switching on the standby power supply when a fault occurs in the main power supply. A system is not powered down at the moment of switching, and the normal operation of the system is not influenced.
Description
Technical field
The utility model relates to power technique fields, is specifically related to a kind of DC power supply commutation circuit.
Background technology
In the telecommunications field, the watch-dog of safety-protection system especially all need be under the situation of outage that meets accident; Still can guarantee that power supply is uninterrupted in a period of time; Assurance system operate as normal is sent some important warning messages, and preserves current important data message; So that related personnel's handling failure information is in time found out failure cause.
In the prior art, (Uninterruptible Power System UPS) backs up main power source, and under the situation of primary power source de-energizes, UPS provides stand-by power supply to system mainly to adopt uninterrupted power supply.UPS generally includes rectification, energy storage, conversion and switch and controls four parts, and this kind implementation cost is higher relatively.
Summary of the invention
In order to solve the problems of the technologies described above, the utility model provide a kind of simple in structure, cost is low, the DC power supply commutation circuit of good stability.The purpose of the utility model is to provide a kind of can connect stand-by power supply rapidly when power supply breaks down, switch moment not power down of system, does not influence the operate as normal of system and mains power failure is given alarm indication.
For realizing above-mentioned purpose, the technical scheme of the utility model is:
A kind of DC power supply commutation circuit; Comprise main power source, auxiliary power and switching switch circuit; Said switching switch circuit comprises first diode and second diode; The positive pole of said first diode is connected with the output of said main power source, and the positive pole of said second diode is connected with the output of said auxiliary power, and the negative pole of said first diode and second diode is connected with load input terminal.
Preferably; Further comprise electric source monitoring circuit; Said electric source monitoring circuit further comprises first resistance, second resistance and control unit, the output of a termination switching switch circuit of first resistance, and an end of the other end of first resistance and second resistance is connected in series; And be connected the other end ground connection of second resistance with the input of control unit.
Preferably, further comprise the indication alarm unit, said indication alarm unit is connected with the output of said electric source monitoring circuit.
Preferably, said control unit is the single-chip microcomputer with A/D sampling function.
Through adopting above technical scheme, the beneficial effect of the utility model is:
(1) adopts hardware to realize switching switch circuit, improve the power supply switching response time, guarantee to switch not power down of moment;
(2) adopt the microcomputer monitoring supply voltage, simplify hardware circuit design, improve circuit reliability.
Description of drawings
Fig. 1 is the structured flowchart of the embodiment one of the utility model DC power supply commutation circuit;
Fig. 2 is the structured flowchart of the embodiment two of the utility model DC power supply commutation circuit.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
On the contrary, the utility model is contained any alternative, the modification of on the marrow of the utility model and scope, making, equivalent method and scheme by claim definition.Further, the utility model is had a better understanding in order to make the public, in hereinafter the details of the utility model being described, detailed some specific detail sections of having described.There is not the description of these detail sections can understand the utility model fully for a person skilled in the art yet.
Referring to Fig. 1; Be depicted as the structured flowchart of a kind of DC power supply commutation circuit of the utility model embodiment one; Comprise main power source 101, auxiliary power 102 and switching switch circuit 103, switching switch circuit 103 comprises the first diode D1 and the second diode D2, and the positive pole of the first diode D1 is connected with the output of main power source 101; The positive pole of the second diode D2 is connected with the output of auxiliary power 102, and the negative pole of the first diode D1 and the second diode D2 is connected with load 200 inputs.Main power source 101 adopts the power supply that stable DC output is arranged by the electric main power supply, and auxiliary power adopts dc-battery, under the situation of mains power failure, by the auxiliary power powering load.The first diode D1 and the second diode D2 have formed a simple switching switch circuit 103, utilize the forward conduction property of diode, and promptly the tube voltage drop of diode is greater than 0.7V, diode current flow then, otherwise just end.Regulate the output voltage of main power source 101 and auxiliary power 102; Make it have the above pressure reduction of 1V, promptly more than the high 1V of output voltage of the output voltage of main power source than auxiliary power, during the main power source operate as normal; The connected first diode D1 conducting; Then not enough so that its conducting of the pressure drop at the second diode D2 two ends, therefore the second diode D2 ends, and give load 200 power supplies by main power source 101 this moment; When main power source 101 faults, then just in time opposite, the first diode D1 ends, and the second diode D2 conducting gives load 200 power supplies by auxiliary power 102.
Further, referring to Fig. 2, be depicted as the structured flowchart of a kind of DC power supply commutation circuit of the utility model embodiment two; Compare with embodiment one; Further increased electric source monitoring circuit 105 and indication alarm unit 106, said electric source monitoring circuit 105 further comprises the output of a termination switching switch circuit 103 of first resistance R 1, second resistance R 2 and control unit 104, the first resistance R 1; One end of the other end of first resistance R 1 and second resistance R 2 is connected in series; And be connected with the input of control unit 104, the other end ground connection of second resistance R 2, indication alarm unit 106 is connected with the output of electric source monitoring circuit 105.The single-chip microcomputer of control unit 104 for having A/D sampling function.Adopt the single-chip microcomputer PIC16F684 of the U.S. little core company (Microchip) in the present embodiment.Electric voltage is through the dividing potential drop of first resistance R 1 and second resistance R 2, and control unit 104 these voltages of sampling judge it is by which power supply power supply according to sample voltage value.When being under the battery powered situation by auxiliary power, judge whether further that according to this magnitude of voltage battery electric quantity exhausts soon, these situation are fed back to the user through indicating alarm device.
Through above technical scheme, adopt a kind of simple circuit to realize that power supply switches, and give alarm indication, improved the response speed and the stability of circuit, reduced cost.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (4)
1. DC power supply commutation circuit; It is characterized in that; Comprise main power source, auxiliary power and switching switch circuit, said switching switch circuit comprises first diode and second diode, and the positive pole of said first diode is connected with the output of said main power source; The positive pole of said second diode is connected with the output of said auxiliary power, and the negative pole of said first diode and second diode is connected with load input terminal.
2. DC power supply commutation circuit according to claim 1; It is characterized in that further comprise electric source monitoring circuit, said electric source monitoring circuit further comprises first resistance, second resistance and control unit; The output of one termination switching switch circuit of first resistance; One end of the other end of first resistance and second resistance is connected in series, and is connected with the input of control unit, the other end ground connection of second resistance.
3. DC power supply commutation circuit according to claim 2 is characterized in that, further comprises the indication alarm unit, and said indication alarm unit is connected with the output of said electric source monitoring circuit.
4. DC power supply commutation circuit according to claim 2 is characterized in that, said control unit is the single-chip microcomputer with A/D sampling function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201907915U CN202513668U (en) | 2012-04-25 | 2012-04-25 | Switching circuit for direct-current power supplies |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201907915U CN202513668U (en) | 2012-04-25 | 2012-04-25 | Switching circuit for direct-current power supplies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202513668U true CN202513668U (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201907915U Expired - Fee Related CN202513668U (en) | 2012-04-25 | 2012-04-25 | Switching circuit for direct-current power supplies |
Country Status (1)
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| CN (1) | CN202513668U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113131A (en) * | 2014-06-26 | 2014-10-22 | 航科院（北京）科技发展有限公司 | Power-off detection protection system used for aircraft data recording equipment |
| CN105630057A (en) * | 2016-03-24 | 2016-06-01 | 航天科技控股集团股份有限公司 | Direct-current power source switching circuit |
| CN106026372A (en) * | 2016-07-29 | 2016-10-12 | 江西洪都航空工业集团有限责任公司 | Remote measuring equipment adaptive power supply device |
| CN115709659A (en) * | 2022-10-26 | 2023-02-24 | 国创巨湾(广州)能源科技有限公司 | IGBT-based direct current charging device, method and storage medium |
-
2012
- 2012-04-25 CN CN2012201907915U patent/CN202513668U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113131A (en) * | 2014-06-26 | 2014-10-22 | 航科院（北京）科技发展有限公司 | Power-off detection protection system used for aircraft data recording equipment |
| CN105630057A (en) * | 2016-03-24 | 2016-06-01 | 航天科技控股集团股份有限公司 | Direct-current power source switching circuit |
| CN105630057B (en) * | 2016-03-24 | 2017-03-29 | 航天科技控股集团股份有限公司 | DC source switching circuit |
| CN106026372A (en) * | 2016-07-29 | 2016-10-12 | 江西洪都航空工业集团有限责任公司 | Remote measuring equipment adaptive power supply device |
| CN115709659A (en) * | 2022-10-26 | 2023-02-24 | 国创巨湾(广州)能源科技有限公司 | IGBT-based direct current charging device, method and storage medium |
| CN115709659B (en) * | 2022-10-26 | 2023-08-08 | 国创巨湾(广州)能源科技有限公司 | IGBT-based direct current charging device, method and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 Termination date: 20140425 |