CN202651773U - Overvoltage protection device of direct current adapter - Google Patents
Overvoltage protection device of direct current adapter Download PDFInfo
- Publication number
- CN202651773U CN202651773U CN 201220324884 CN201220324884U CN202651773U CN 202651773 U CN202651773 U CN 202651773U CN 201220324884 CN201220324884 CN 201220324884 CN 201220324884 U CN201220324884 U CN 201220324884U CN 202651773 U CN202651773 U CN 202651773U
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- China
- Prior art keywords
- power supply
- protection device
- overvoltage protection
- adapter
- direct current
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an overvoltage protection device of a direct current adapter. The overvoltage protection device is characterized in that a power supply passes through a wave shaping circuit and then is connected to an input terminal of a preceding-stage triode by divider resistors; an output terminal thereof is connected with a charging and discharging circuit and then is connected to an input terminal of a backward-stage triode; and the output terminal thereof is connected with a relay coil; and a normally open contact of the relay is connected with the power supply. According to the utility model, a defect that the direct current adapter is easily burned and damaged due to too high voltages caused by mis-plugging of a plug into a DC110-V or AC 220-V power supply can be overcome. When the high voltage is accessed and inputted, the high-voltage main power supply can not enter the backward-stage core portion, thereby effectively protecting the adapter. Moreover, the provided overvoltage protection device has advantages of simple structure, low cost, and convenient and reliable usage.
Description
Technical field
The utility model relates to a kind of input voltage too high and effective resist technology of adopting, particularly a kind of DC adapter over-pressure safety device.
Technical background
Before the present utility model, a large amount of electronic equipments, particularly computer under many circumstances environment for use are different, and input voltage is not common civil power AC220V power-supply system, but the input of some special voltage grades, all need to customize the power supply of some special input ranks.Because the socket that uses on market or the vehicle is identical with common AC socket, the adaptor power supplies plug is the same with 3 common plugs, be easy to plug is inserted into DC110V or AC220V power supply the inside, too high voltage easily causes DC adapter to burn damage, and the selection for the core power device of adapter has caused great difficulty, has caused very large difficulty to design.
Summary of the invention
The purpose of this utility model just is to overcome defects and difficulty, design, a kind of DC adapter over-pressure safety device of development.
The technical solution of the utility model is:
A kind of DC adapter over-pressure safety device; its technical characteristics be power supply through shaping circuit by divider resistance to prime triode input; its output termination charge-discharge circuit is to rear class triode input, and its output is succeeded the electric wire bag, and relay normally open contact connects power supply.
The beneficial effects of the utility model are that during with high voltage access input, high voltage master electricity can't enter the rear class core, thereby has effectively protected adapter.Simple in structure, cost is low, and is easy to use, reliable.
Other advantages of the present utility model and effect will go on to say below.
Description of drawings
Fig. 1---circuit theory schematic diagram of the present utility model.
Embodiment
As shown in Figure 1:
Power supply through shaping circuit by divider resistance to prime triode input, its output termination charge-discharge circuit is to rear class triode input, its output is succeeded the electric wire bag, relay normally open contact comprises power supply.
Be described as follows:
Voltage is from socket CZ input, through behind the rectifier diode D1 bridge through divider resistance R1 and R2 (power consumption is considered in the selection of R1, R2, R3); When R2 divide overtension the time, prime triode (being called for short T1) conducting, not conducting of rear class triode (being called for short T2), relay this moment (being called for short K1) line bag 4 and line bag 5 must not be electric, not adhesive of K1, overvoltage indicator light DS1 sends out a warning by the normally closed point 1,3 of K1, and DC adapter is not worked; When input voltage is in allowed band, R2 divides less than enough voltage makes the T1 conducting, cause not conducting of T1, this moment power supply by current-limiting resistance R3 to capacitor C 1 charging, T2 conducting time certain, K1 line bag 4 and line bag 5 must be electric, the K1 adhesive, by 1,2 normal conductings battle of K1, with the main electricity input rear class loop of input, DC adapter normal operation.The effect of D2 guarantees the reliable turn-on and turn-off of T2.
This circuit is simple and practical, even adapter is inserted AC220 or DC110V high voltage, adapter can not damage yet; T1 conducting this moment, T2 just can conducting after the T1 conducting, and K1 can adhesive yet certainly; main electricity just can not enter rear class and cause that late-class circuit damages, and has effectively protected DC adapter.
Some use when only having the Power supply of DC48V the utility model on the part train, are a kind ofly to become DC19.5V to provide power supply to notebook computer the DC48V voltage transitions.
Claims (3)
1. DC adapter over-pressure safety device; it is characterized in that power supply through shaping circuit by divider resistance to prime triode input; its output termination charge-discharge circuit is to rear class triode input, and its output is succeeded the electric wire bag, and relay normally open contact connects power supply.
2. a kind of DC adapter over-pressure safety device according to claim 1 is characterized in that not relay normally-closed contact conducting during conducting of rear class triode.
3. a kind of DC adapter over-pressure safety device according to claim 1, relay normally open contact power turn-on when it is characterized in that the conducting of rear class triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220324884 CN202651773U (en) | 2012-07-06 | 2012-07-06 | Overvoltage protection device of direct current adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220324884 CN202651773U (en) | 2012-07-06 | 2012-07-06 | Overvoltage protection device of direct current adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202651773U true CN202651773U (en) | 2013-01-02 |
Family
ID=47420818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220324884 Expired - Fee Related CN202651773U (en) | 2012-07-06 | 2012-07-06 | Overvoltage protection device of direct current adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202651773U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426124A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and lamp with overvoltage protection function |
| CN105006800A (en) * | 2014-04-16 | 2015-10-28 | 明泰科技股份有限公司 | Foolproof circuit having overvoltage protection function and designed by use of relay |
| TWI594536B (en) * | 2014-04-02 | 2017-08-01 | Use of relay design with over-voltage protection function foolproof circuit | |
| CN110445216A (en) * | 2019-08-14 | 2019-11-12 | 上海艾为电子技术股份有限公司 | A kind of charging chip |
| CN110611301A (en) * | 2018-06-15 | 2019-12-24 | 华为技术有限公司 | Protection device, protection circuit and terminal equipment |
-
2012
- 2012-07-06 CN CN 201220324884 patent/CN202651773U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426124A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Overvoltage protection circuit and lamp with overvoltage protection function |
| TWI594536B (en) * | 2014-04-02 | 2017-08-01 | Use of relay design with over-voltage protection function foolproof circuit | |
| CN105006800A (en) * | 2014-04-16 | 2015-10-28 | 明泰科技股份有限公司 | Foolproof circuit having overvoltage protection function and designed by use of relay |
| CN105006800B (en) * | 2014-04-16 | 2018-02-02 | 明泰科技股份有限公司 | Utilize the fool proof circuit with over-voltage protection function of relay design |
| CN110611301A (en) * | 2018-06-15 | 2019-12-24 | 华为技术有限公司 | Protection device, protection circuit and terminal equipment |
| CN110445216A (en) * | 2019-08-14 | 2019-11-12 | 上海艾为电子技术股份有限公司 | A kind of charging chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130102 Termination date: 20150706 |
|
| EXPY | Termination of patent right or utility model |