CN103280865A - Charging port with over-voltage protection - Google Patents
Charging port with over-voltage protection Download PDFInfo
- Publication number
- CN103280865A CN103280865A CN2013102334835A CN201310233483A CN103280865A CN 103280865 A CN103280865 A CN 103280865A CN 2013102334835 A CN2013102334835 A CN 2013102334835A CN 201310233483 A CN201310233483 A CN 201310233483A CN 103280865 A CN103280865 A CN 103280865A
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- resistance
- charging port
- comparator
- comparison circuit
- triode
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging port with over-voltage protection. The charging port with the over-voltage protection comprises a protective circuit, wherein the protective circuit is arranged between a grounding port and an internal circuit, the protective circuit comprises a resistor R1, a comparator M and a field-effect tube Q, a source electrode of the field-effect tube Q is connected with the grounding port, a drain electrode of the field-effect tube Q is connected with the internal circuit, one end of the resistor R1 is connected with the drain electrode of the field-effect tube Q, the other end of the resistor R1 is connected with the ground, two inputs of the comparator M are connected to the two ends of the resistor R1 respectively, and the output of the comparator M is connected to a grid electrode of the field-effect tube Q. The charging port with the over-voltage protection has the advantages that the protective circuit is started up when the grounding port of a charger is connected with a power source, the connection between the grounding port and the internal circuit is cut off, and the charger is protected.
Description
Technical field
The present invention relates to a kind of protective circuit, particularly relate to a kind of charging port with overvoltage protection.
Background technology
During the charging port place overtension of charger, can the internal circuit of charger be damaged, even be corrupted to the electrical equipment of charging.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of charging port with overvoltage protection is provided, overcome existing charger port voltage when too high, can destroy the defective of charger internal circuit and charging electrical equipment.
Purpose of the present invention is achieved through the following technical solutions: the charging port of band overvoltage protection; comprise triode Q; comparator M and comparison circuit; the collector electrode of described triode Q is connected to charging port; emitter is connected to the internal circuit of charger; described comparison circuit comprises first comparison circuit and second comparison circuit; first comparison circuit comprises resistance R 1 and the resistance R 2 of series connection; another termination charging port of resistance R 1; the other end ground connection of resistance R 2; second comparator comprises resistance R 3 and the voltage stabilizing didoe D of series connection; the plus earth of voltage stabilizing didoe D, negative pole connects charging port by resistance R 3, and one of them input of described comparator M is connected to the junction of resistance R 1 and resistance R 2; another input is connected to the negative pole of voltage stabilizing didoe D, and its output is connected to the base stage of triode Q.In this circuit; in the time of usual; two inputs of comparator M; a voltage that is input as resistance R 1 and resistance R 2 junctions; for charging voltage by resistance R 1 and resistance R 2 voltage after partial; another is input as the setting voltage of voltage stabilizing didoe D; the voltage that comparator M output is less, when operate as normal, the output of comparator M has voltage all the time; the base stage place of triode Q has electric current all the time; triode Q is conducting like this, when overvoltage appears in charging port, when exceeding the voltage stabilizing value to the voltage of voltage stabilizing didoe D after resistance R 3 dividing potential drops; voltage stabilizing didoe D is namely breakdown; at this moment comparator M output voltage is 0, and the electric current at triode Q base stage place is O, makes triode Q end; thereby avoid overvoltage to enter into internal circuit, protected the safety of internal circuit.
Further, the positive source of above-mentioned comparator M is connected to charging port, its power cathode ground connection, and the power supply of comparator M directly uses the voltage at charging port place, has saved other electric power systems, as battery.
The invention has the beneficial effects as follows: the charging port place of the setting of this circuit and charger, there have overvoltage at charging port to be interim, turn-offs charging port to the connection of internal circuit, thus the electrical equipment of having protected charger and having charged.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2.
Embodiment
The present invention is described in further detail below in conjunction with embodiment, but structure of the present invention is not limited only to following examples:
[embodiment 1]
As shown in Figure 1; the charging port of band overvoltage protection; comprise triode Q; comparator M and comparison circuit; the collector electrode of described triode Q is connected to charging port; emitter is connected to the internal circuit of charger; described comparison circuit comprises first comparison circuit and second comparison circuit; first comparison circuit comprises resistance R 1 and the resistance R 2 of series connection; another termination charging port of resistance R 1; the other end ground connection of resistance R 2, second comparator comprise resistance R 3 and the voltage stabilizing didoe D of series connection, the plus earth of voltage stabilizing didoe D; negative pole connects charging port by resistance R 3; one of them input of described comparator M is connected to the junction of resistance R 1 and resistance R 2, and another input is connected to the negative pole of voltage stabilizing didoe D, and its output is connected to the base stage of triode Q.In this circuit; in the time of usual; two inputs of comparator M; a voltage that is input as resistance R 1 and resistance R 2 junctions; for charging voltage by resistance R 1 and resistance R 2 voltage after partial; another is input as the setting voltage of voltage stabilizing didoe D; the voltage that comparator M output is less, when operate as normal, the output of comparator M has voltage all the time; the base stage place of triode Q has electric current all the time; triode Q is conducting like this, when overvoltage appears in charging port, when exceeding the voltage stabilizing value to the voltage of voltage stabilizing didoe D after resistance R 3 dividing potential drops; voltage stabilizing didoe D is namely breakdown; at this moment comparator M output voltage is 0, and the electric current at triode Q base stage place is O, makes triode Q end; thereby avoid overvoltage to enter into internal circuit, protected the safety of internal circuit.
[embodiment 2]
As shown in Figure 2, the structure of present embodiment is basic consistent with embodiment 1, and difference is that the positive source of comparator M is connected to charging port, its power cathode ground connection, the power supply of comparator M directly uses the voltage at charging port place, has saved other electric power systems, as battery.
Claims (2)
1. be with the charging port of overvoltage protection; it is characterized in that; comprise triode Q; comparator M and comparison circuit; the collector electrode of described triode Q is connected to charging port; emitter is connected to the internal circuit of charger; described comparison circuit comprises first comparison circuit and second comparison circuit; first comparison circuit comprises resistance R 1 and the resistance R 2 of series connection; another termination charging port of resistance R 1; the other end ground connection of resistance R 2, second comparator comprise resistance R 3 and the voltage stabilizing didoe D of series connection, the plus earth of voltage stabilizing didoe D; negative pole connects charging port by resistance R 3; one of them input of described comparator M is connected to the junction of resistance R 1 and resistance R 2, and another input is connected to the negative pole of voltage stabilizing didoe D, and its output is connected to the base stage of triode Q.
2. the charging port of band overvoltage protection according to claim 1 is characterized in that, the positive source of described comparator M is connected to charging port, its power cathode ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102334835A CN103280865A (en) | 2013-06-14 | 2013-06-14 | Charging port with over-voltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102334835A CN103280865A (en) | 2013-06-14 | 2013-06-14 | Charging port with over-voltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103280865A true CN103280865A (en) | 2013-09-04 |
Family
ID=49063341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102334835A Pending CN103280865A (en) | 2013-06-14 | 2013-06-14 | Charging port with over-voltage protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103280865A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746446A (en) * | 2013-12-20 | 2014-04-23 | 青岛歌尔声学科技有限公司 | Ceaseless power-supplying circuit and electronic product |
| CN104218533A (en) * | 2014-10-09 | 2014-12-17 | 上海斐讯数据通信技术有限公司 | Power input overvoltage turn-off protection circuit |
| CN104577994A (en) * | 2013-10-24 | 2015-04-29 | 深圳市海洋王照明工程有限公司 | Chargeable lamp and chargeable over-voltage protection circuit thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188862A (en) * | 1998-12-21 | 2000-07-04 | Nec Fukushima Ltd | Input circuit for dc-dc converter |
| US20070014159A1 (en) * | 2005-06-30 | 2007-01-18 | Delta Electronics, Inc. | Under voltage protection device |
| CN101350532A (en) * | 2007-07-03 | 2009-01-21 | 英特赛尔美国股份有限公司 | Over-voltage protected battery charger with bypass |
| CN203278357U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | Charging port circuit with overvoltage protection function |
-
2013
- 2013-06-14 CN CN2013102334835A patent/CN103280865A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188862A (en) * | 1998-12-21 | 2000-07-04 | Nec Fukushima Ltd | Input circuit for dc-dc converter |
| US20070014159A1 (en) * | 2005-06-30 | 2007-01-18 | Delta Electronics, Inc. | Under voltage protection device |
| CN101350532A (en) * | 2007-07-03 | 2009-01-21 | 英特赛尔美国股份有限公司 | Over-voltage protected battery charger with bypass |
| CN203278357U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | Charging port circuit with overvoltage protection function |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577994A (en) * | 2013-10-24 | 2015-04-29 | 深圳市海洋王照明工程有限公司 | Chargeable lamp and chargeable over-voltage protection circuit thereof |
| CN103746446A (en) * | 2013-12-20 | 2014-04-23 | 青岛歌尔声学科技有限公司 | Ceaseless power-supplying circuit and electronic product |
| CN103746446B (en) * | 2013-12-20 | 2016-09-07 | 青岛歌尔声学科技有限公司 | A kind of uninterrupted power supply circuit and electronic product |
| CN104218533A (en) * | 2014-10-09 | 2014-12-17 | 上海斐讯数据通信技术有限公司 | Power input overvoltage turn-off protection circuit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130904 |