CN101521376A - Power polar protective circuit - Google Patents
Power polar protective circuit Download PDFInfo
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- CN101521376A CN101521376A CN200810300403A CN200810300403A CN101521376A CN 101521376 A CN101521376 A CN 101521376A CN 200810300403 A CN200810300403 A CN 200810300403A CN 200810300403 A CN200810300403 A CN 200810300403A CN 101521376 A CN101521376 A CN 101521376A
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- input
- electronic switch
- negative
- input end
- positive
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Abstract
The invention relates to a power polar protective circuit, which comprises a first input end, a second input end, a comparison amplifier, a first electronic switch, a second electronic switch, a third electronic switch, a fourth electronic switch, a positive output end and a negative output end. A positive input end and a reverse input end of the comparison amplifier are connected to the first input end and the second input end respectively; when the first input end and the second input end are connected with a positive electrode and a negative electrode of a DC power supply respectively, the first electronic switch and the second electronic switch are conducted, and the positive output end and the negative output end are communicated with the first input end and the second input end respectively; and when the first input end and the second input end are connected with the negative electrode and the positive electrode of the DC power supply respectively, the positive output end and the negative output end are communicated with the second input end and the first input end through the fourth electronic switch and the third electronic switch, so that a correct polar is output. The power polar protective circuit has a simple structure.
Description
Technical field
The present invention relates to a kind of power polar protective circuit.
Background technology
Electronic equipment is when using the external direct current power supply power supply, the polarity of its input must be identical with the polarity of external direct current power supply output, can be effectively, work safely, and the operator is when being connected electronic equipment with external power supply, sometimes that the positive and negative output termination of the positive and negative power input of electronic equipment and external power supply is anti-, gently then make the electronic equipment cisco unity malfunction, heavy then cause equipment burnout, even major accident, cause irreparable damage.
Summary of the invention
In view of above content, be necessary to provide a kind of power polar protective circuit, be without prejudice inverse time connecing with the protection electronic equipment with external direct current power supply polarity.
A kind of power polar protective circuit; comprise first and second inputs; one comparison amplifier; first; second; third and fourth electronic switch is just reaching; negative output terminal; the forward of described comparison amplifier; reverse input end connects described first respectively; second input; described first; second; first end of third and fourth electronic switch all connects the output of described comparison amplifier; second of described first electronic switch; the 3rd end is connected to described positive output end and described first input end respectively; second of described second electronic switch; the 3rd end is connected to described second input and described negative output terminal respectively; second of described the 3rd electronic switch; the 3rd end is connected to described negative output terminal and described first input end respectively; second of described quadrielectron switch; the 3rd end is connected to described second input and described positive output end respectively; when described first; second input just is being connected to a direct current power supply; during negative pole; described comparison amplifier output high level makes described first; the second electronic switch conducting; the described the 3rd; quadrielectron switch ends; just described; negative output terminal is respectively with described first; second input is communicated with and exports correct polarity; when described first; second input is connected to the negative of described DC power supply; anodal; described comparison amplifier output low level makes described first; second electronic switch ends; the described the 3rd; quadrielectron switch conduction, just described; negative output terminal is respectively with described second; first input end is communicated with and exports correct polarity.
Described power polar protective circuit is controlled the conducting or the closure of some electronic switches by a comparison amplifier; no matter two inputs of circuit insert the polarity correctness of DC power supply; all can make its positive and negative output by the different correct polarity of path output, simple in structure.
Description of drawings
Below in conjunction with accompanying drawing and better embodiment the present invention is described in further detail:
Fig. 1 is the circuit diagram of power polar protective circuit better embodiment of the present invention.
Embodiment
Please refer to Fig. 1; power polar protective circuit of the present invention is installed between an electronic equipment power source input and the direct current power supply (figure does not show); its better embodiment comprises two inputs 1 and 2, one comparison amplifier U, four triode Q1, Q2, Q3 and Q4 and positive and negative outputs 3,4 as electronic switch; described triode Q1, Q2 are NPN type triode, and described triode Q3, Q4 are the positive-negative-positive triode.
Described input 1,2 just are being used to connect described DC power supply, negative pole, the forward of described comparison amplifier U, reverse input end connects described input 1 respectively, 2, described triode Q1, Q2, Q3, the base stage of Q4 all connects the output of described comparison amplifier U, the collector electrode of described triode Q1 is connected to described input 1, emitter is connected to described positive output end 3, the collector electrode of described triode Q2 is connected to described negative output terminal 4, emitter is connected to described input 2, the collector electrode of described triode Q3 is connected to described input 1, emitter is connected to described negative output terminal 4, the collector electrode of described triode Q4 is connected to described positive output end 3, and emitter is connected to described input 2.
When the positive pole of the described DC power supply of described input 1 connection, when described input 2 connects the negative pole of described DC power supply, described comparison amplifier U output high level makes described triode Q1, Q2 conducting, described triode Q3, Q4 end, and described positive and negative output 3,4 is communicated with described input 1,2 by described triode Q1, Q2 respectively; Otherwise, connect the negative pole of described DC power supply when described input 1, when input 2 connects described DC power supply anodal, described comparison amplifier U output low level is ended described triode Q1, Q2, described triode Q4, Q5 conducting, described positive and negative output 3,4 are communicated with described input 2,1 by described triode Q4, Q3 respectively; Therefore, described positive and negative output 3,4 all can be by suitable path with correct polarity output.
As other execution modes, described triode Q1, Q2 can be respectively N-channel MOS type field-effect transistor and replace, described triode Q3, Q4 can be respectively P channel MOS type field-effect transistor and replace, the annexation of the grid of described N raceway groove, P channel MOS type field-effect transistor, drain electrode, the source electrode connected mode with the base stage of corresponding triode, collector electrode, emitter respectively is identical, and described N raceway groove, P channel MOS type field-effect transistor are identical with the application principle of corresponding triode, repeat no more.
Described power polar protective circuit can guarantee to connect inverse time in the polarity of input 1,2, and its positive and negative output 3,4 also with correct polarity output, makes the electronic equipment operate as normal that is connected between the described positive and negative output 3,4.
Claims (3)
- [claim 1] a kind of power polar protective circuit; comprise first and second inputs; one comparison amplifier; first; second; third and fourth electronic switch is just reaching; negative output terminal; the forward of described comparison amplifier; reverse input end connects described first respectively; second input; described first; second; first end of third and fourth electronic switch all connects the output of described comparison amplifier; second of described first electronic switch; the 3rd end is connected to described positive output end and described first input end respectively; second of described second electronic switch; the 3rd end is connected to described second input and described negative output terminal respectively; second of described the 3rd electronic switch; the 3rd end is connected to described negative output terminal and described first input end respectively; second of described quadrielectron switch; the 3rd end is connected to described second input and described positive output end respectively; when described first; second input just is being connected to a direct current power supply; during negative pole; described comparison amplifier output high level makes described first; the second electronic switch conducting; the described the 3rd; quadrielectron switch ends; just described; negative output terminal is respectively with described first; second input is communicated with and exports correct polarity; when described first; second input is connected to the negative of described DC power supply; anodal; described comparison amplifier output low level makes described first; second electronic switch ends; the described the 3rd; quadrielectron switch conduction, just described; negative output terminal is respectively with described second; first input end is communicated with and exports correct polarity.
- [claim 2] power polar protective circuit as claimed in claim 1; it is characterized in that: described first, second electronic switch is a NPN type triode; described the 3rd, quadrielectron switch is the positive-negative-positive triode, and described first, second, third end is respectively base stage, emitter, collector electrode.
- [claim 3] power polar protective circuit as claimed in claim 1; it is characterized in that: described first, second electronic switch is a N-channel MOS type field-effect transistor; described the 3rd, quadrielectron switch is a P channel MOS type field-effect transistor, and described first, second, third end is respectively grid, source electrode, drain electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810300403A CN101521376A (en) | 2008-02-27 | 2008-02-27 | Power polar protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810300403A CN101521376A (en) | 2008-02-27 | 2008-02-27 | Power polar protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101521376A true CN101521376A (en) | 2009-09-02 |
Family
ID=41081808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810300403A Pending CN101521376A (en) | 2008-02-27 | 2008-02-27 | Power polar protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101521376A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970011A (en) * | 2012-11-13 | 2013-03-13 | 海能达通信股份有限公司 | Load device, power line and reverse connection preventing device |
-
2008
- 2008-02-27 CN CN200810300403A patent/CN101521376A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970011A (en) * | 2012-11-13 | 2013-03-13 | 海能达通信股份有限公司 | Load device, power line and reverse connection preventing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090902 |