CN203589722U - Reverse connection resistant circuit used for DC power supply - Google Patents
Reverse connection resistant circuit used for DC power supply Download PDFInfo
- Publication number
- CN203589722U CN203589722U CN201320706281.3U CN201320706281U CN203589722U CN 203589722 U CN203589722 U CN 203589722U CN 201320706281 U CN201320706281 U CN 201320706281U CN 203589722 U CN203589722 U CN 203589722U
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- diode
- power supply
- reversal connection
- circuit
- electronic product
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- 230000001681 protective effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses a reverse connection resistant circuit used for DC power supply. The circuit is characterized by allowing a positive terminal and a negative terminal of a power supply line to be respectively in series connection with a one-way conduction diode D1 and a one-way conduction diode D4. A light emitting diode D3, a current-limiting resistor R1 and a diode D2 are in series connection and then jointly in parallel connection with positive and negative terminals of a power supply. Since the above circuit structure is adopted, the circuit is advantaged by (1) playing a protective role in case of reverse connection of a DC power supplying electronic product, (2) timely alarming and prompting, and (3) being simple in structure and having no influence to normal usage of the electronic product.
Description
Technical field
The utility model relates to and a kind ofly for direct current supply, prevents reversal connection circuit.
Background technology
In the electronic product of direct current supply when there is reversal connection, if do not have reverse connecting protection to tend to cause electronic product to be burned.Traditional DC reverse connection is protected only anode or an one-way conduction diode of negative terminal series connection of Shi supply line.This method is when reverse power connection, power supply and product are not isolated completely, always there is one end to communicate with product, under power supply is unstable or the circuit of product own is processed over the ground the specific condition such as bad, product still has and may be burned, and there is no reversal connection warn device, operator is difficult to very first time discovering device reversal connection.
For the problems referred to above, a kind of novel circuit is provided, in the electronic product generation reversal connection of direct current supply, reach the effect of protection, and can carry out in time alarm.
Utility model content
Technical problem to be solved in the utility model is, provide a kind of for direct current supply prevent reversal connection circuit, in the electronic product generation reversal connection of direct current supply, reach the effect of protection, and can carry out in time alarm.
For achieving the above object, the technical solution of the utility model is, a kind of for direct current supply prevent reversal connection circuit, it is characterized in that: described prevent that reversal connection circuit from being the anode of supply line and negative terminal connect respectively diode D1, the D4 of an one-way conduction; After light-emitting diode D3, current-limiting resistance R1, diode D2 series connection, be parallel to the positive and negative port of power supply.
Described diode D1, D4 forward conduction when electronic product just connects; Diode D2 oppositely ends.
Described diode D1, D4 oppositely end in electronic product reversal connection; Diode D2 forward conduction, light-emitting diode D3 electrified light emitting.
For direct current supply prevent a reversal connection circuit, owing to adopting above-mentioned circuit structure, the utility model has the advantage of: 1, in the electronic product generation reversal connection of direct current supply, reach the effect of protection; 2, can carry out in time alarm; 3, simple in structure, do not affect the normal use of electronic product.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail;
Fig. 1 is a kind of circuit diagram that prevents reversal connection circuit for direct current supply of the utility model.
Embodiment
As shown in Figure 1, the utility model is at the anode of supply line and negative terminal connect respectively one-way conduction diode D1, a D4, when reversal connection, two diode D1, D4 oppositely end, isolate electric power system and product completely, avoided the thing that product is burned when power supply is unstable or the circuit of product own is processed over the ground the specific condition such as bad to occur.The utility model is parallel to light-emitting diode D3, current-limiting resistance R1, diode D2 the anti-reverse warn device of the positive and negative port formation of power supply simultaneously after being cascaded, when reversal connection, one-way conduction diode current flow D2 in warn device, light-emitting diode D3 is shinny, can prompting operation person's very first time find reversal connection.
Concrete, the utility model comprises diode D1, D2, D4, light-emitting diode D3, current-limiting resistance R1.
As the positive termination POWER IN+ of DC power supply, when negative terminal meets POWER IN –, diode D1, D4 forward conduction, diode D2 oppositely ends, the product that is connected on POWER OUT+, POWER OUT – two ends can normally be worked, and reversal connection indicator light light-emitting diode D3 does not work;
As the positive termination POWER IN-of DC power supply, when negative terminal meets POWER IN+, diode D1, D4 oppositely end, diode D2 forward conduction, the product that is connected on POWER OUT+, POWER OUT – two ends is not powered, and can not work, and D3 is bright for reversal connection indicator light light-emitting diode.
Because the utility model is mainly in the face of the electric power system of display module product, the power supply overwhelming majority of display module product is not more than DC30V, so current-limiting resistance R1 is chosen as 1K, when reversal connection DC30V, the electric current that flows through light-emitting diode is 30mA.When if the utility model need to be used in the DC power supply that is greater than DC30V, need to improve as the case may be the resistance of R1, prevent light-emitting diode overcurrent.
By reference to the accompanying drawings the utility model is exemplarily described above; obviously the utility model specific implementation is not subject to the restrictions described above; as long as the various improvement that adopted technical solutions of the utility model to carry out; or directly apply to other occasion without improvement, all within protection range of the present utility model.
Claims (3)
- For direct current supply prevent a reversal connection circuit, it is characterized in that: described prevent that reversal connection circuit from being the anode of supply line and negative terminal connect respectively diode D1, the D4 of an one-way conduction; After light-emitting diode D3, current-limiting resistance R1, diode D2 series connection, be parallel to the positive and negative port of power supply.
- According to claim 1 a kind of for direct current supply prevent reversal connection circuit, it is characterized in that: described diode D1, D4 forward conduction when electronic product just connects; Diode D2 oppositely ends.
- According to claim 1 a kind of for direct current supply prevent reversal connection circuit, it is characterized in that: described diode D1, D4 oppositely end in electronic product reversal connection; Diode D2 forward conduction, light-emitting diode D3 electrified light emitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320706281.3U CN203589722U (en) | 2013-11-08 | 2013-11-08 | Reverse connection resistant circuit used for DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320706281.3U CN203589722U (en) | 2013-11-08 | 2013-11-08 | Reverse connection resistant circuit used for DC power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203589722U true CN203589722U (en) | 2014-05-07 |
Family
ID=50587574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320706281.3U Expired - Lifetime CN203589722U (en) | 2013-11-08 | 2013-11-08 | Reverse connection resistant circuit used for DC power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203589722U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133431A (en) * | 2019-05-27 | 2019-08-16 | 上海广为美线电源电器有限公司 | The positive-negative connected detection circuit of battery and the electronic equipment with charge function |
-
2013
- 2013-11-08 CN CN201320706281.3U patent/CN203589722U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133431A (en) * | 2019-05-27 | 2019-08-16 | 上海广为美线电源电器有限公司 | The positive-negative connected detection circuit of battery and the electronic equipment with charge function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140507 |