CN101222147A - Electric voltage reverse-connection protection circuit - Google Patents
Electric voltage reverse-connection protection circuit Download PDFInfo
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- CN101222147A CN101222147A CNA2007100366817A CN200710036681A CN101222147A CN 101222147 A CN101222147 A CN 101222147A CN A2007100366817 A CNA2007100366817 A CN A2007100366817A CN 200710036681 A CN200710036681 A CN 200710036681A CN 101222147 A CN101222147 A CN 101222147A
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Abstract
The invention provides a voltage reverse connection protective circuit. A current dividing device connected between a negative terminal of a voltage line and a control unit circuit is adopted to guide the reversely charged current into earth, thereby preventing the reversely charged current from damaging each device inside the circuit and having the function of voltage reverse connection protection.
Description
Affiliated technical field
The present invention relates to electric voltage reverse-connection protection circuit.Especially, it relates to and a kind ofly prevents that voltage reversal from connecting and cause the circuit internal element to damage electric voltage reverse-connection protection circuit.
Background technology
Along with various electronic products are surging forward and rapid popularizing; and constantly develop towards the direction of portability, lightness and environmental protectionization; various power supplys, battery, battery charger etc. provide equipment also to open market as the energy of electronic product vitals thereupon, and the circuit that these devices are protected is also presented vigorous demand situation and vast market space more.
At present in this protective circuit field; based on the various problems that may occur, the scheme of proposition is also of a great variety, but concludes; mainly be based on and solve technical detailed problems such as charging current is excessive, charging voltage is excessive, for mistake prevent from then to rarely have relate to.
In fact, artificial error may cause even more serious infringement to the miscellaneous part of rechargeable battery and charging device, the particularly infringement that causes of electric voltage reverse-connection can direct various power supplys, the damage of battery, battery charger, also may cause catastrophic effect under given conditions.For example, as one of problem that presses for solution the most, the charging voltage of battery oppositely connects, and the negative pole end of charged lithium cells will be born reach+5V or more high-intensity charging voltage and consequent bigger reverse charging electric current, thereby cause comparatively serious consequence.
Summary of the invention
The present invention is and addresses the above problem proposition.By a part flow arrangement that is connected between voltage path negative terminal and the chip controls element circuit, the electric current of reverse charging is led ground, thereby prevent that reverse charge stream from causing damage to each device in the circuit, thereby finish the electric voltage reverse-connection protective effect.
The present invention is achieved through the following technical solutions:
A kind of electric voltage reverse-connection protection circuit; the electronic switch S that comprises control unit circuit and its control; it is characterized in that; it also comprises: part flow arrangement; the one end connects the Vin-end of applied voltage; other end ground connection, and connect the reference voltage path at Rref place and the input signal end of control unit circuit simultaneously.
Described electronic switch S can or other forms ofly can constitute according to the electronic device of conducting of voltage swing initialization circuit and disconnection by triode, field effect transistor.
Described part flow arrangement, its specific implementation can be following any one form, or the combination in any of several forms, combining form comprises that series, parallel, series connection and the parallel connection mixing of use simultaneously is connected:
Fixed resistance or variable resistor, or be equivalent to the various devices of resistance effect in the integrated circuit;
Diode, triode or field effect transistor;
Various forms of PN junctions.
Described part flow arrangement, the reference voltage path at the Rref place of its connection can be connected on voltage output end Vout+ port, also can be connected on voltage input end Vin+ port, perhaps connects Vout+ port and Vin+ port simultaneously.
Industrial utilization and possibility of its application
Electric voltage reverse-connection protection circuit of the present invention can be applied to but be not limited in the power supply, battery, battery charger of various portable electric appts and all ranges of application related to the present invention and occasion that its electric voltage reverse-connection is protected in.
Figure of description
Fig. 1 is the simple structure chart of a kind of electric voltage reverse-connection protection circuit of expression the present invention.
Fig. 2 is the execution mode figure of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention.
Fig. 3 is the concrete enforcement figure that realizes part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention with PN junction.
Embodiment
With reference to the description of drawings embodiments of the present invention.
Fig. 1 is the simple structure chart of a kind of electric voltage reverse-connection protection circuit of the present invention.
Fig. 1 (a) is simple structure first embodiment of a kind of electric voltage reverse-connection protection circuit of the present invention.The structure of Fig. 1 (a) has: control unit circuit, and can confucian orthodoxy and the disconnection of control electronic switch S be passed through thereby decision adds input voltage; Electronic switch S can or other forms ofly can constitute according to the electronic device of conducting of voltage swing initialization circuit and disconnection by triode, field effect transistor.
Part flow arrangement, one end connect the Vin-end of charging device, other end ground connection, and connect the reference voltage path at Rref place and the input signal end of control unit circuit simultaneously.The reference voltage path then is connected between rechargeable battery Vout+ and the ground GND.When adding input voltage when the situation of both positive and negative polarity reversal connection occurring, that is external charge end Vin+ and Vin-appearance inversion, then reverse charging current can be led ground through this part flow arrangement, thereby avoids or reduce the infringement that charging current causes voltage output end chain device.
Fig. 1 (b) is simple structure second embodiment of a kind of electric voltage reverse-connection protection circuit of the present invention.The structure of Fig. 1 (b) is basic identical with resistance 1 (a), and difference is that the reference voltage path then is connected between rechargeable battery Vout+ and the ground GND.Its operation principle is identical with Fig. 1 (a).
Fig. 1 (c) is simple structure the 3rd embodiment of a kind of electric voltage reverse-connection protection circuit of the present invention.The structure of Fig. 1 (c) and Fig. 1 (a) are basic identical, and difference is that the reference voltage path then is connected between rechargeable battery Vout+ and the ground GND.Its operation principle is identical with Fig. 1 (a).
Fig. 2 is the execution mode figure of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention.
Fig. 2 (a) is first embodiment of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention, adopts resistance as part flow arrangement, and specific implementation can be fixed resistance or variable resistor, or is equivalent to the various devices of resistance effect in the integrated circuit.When adding input voltage when the situation of both positive and negative polarity reversal connection occurring, that is to be inverted appear in external charge end Vin+ and Vin-, and then reverse charging current can be led ground through this resistance, thereby avoid or reduce the infringement that charging current causes voltage output end institute connected device spare.
Fig. 2 (b) is second embodiment of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention; adopt diode as part flow arrangement; specific implementation can single diode, also can be a plurality of diode in series, perhaps serial or parallel connection resistance on the basis of diode path.Its operation principle and Fig. 2 (b) are basic identical.
Fig. 2 (c) is the 3rd embodiment of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention, adopts field effect transistor as part flow arrangement, and specific implementation is the PMOS pipe among the figure, also can use the NMOS pipe of conversion grid closure.Its operation principle and Fig. 2 (b) are basic identical.
Fig. 2 (c) is the 3rd embodiment of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention; adopt field effect transistor as part flow arrangement; specific implementation is the PMOS pipe among the figure, also can use the NMOS pipe of conversion grid closure, perhaps technotron.Its operation principle and Fig. 2 (b) are basic identical.
Fig. 2 (d) is the 4th embodiment of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention, adopts triode as part flow arrangement, and specific implementation is the TTL pipe among the figure, and its base stage is connected with emitter-base bandgap grading, also can use the triode of other types.Its operation principle and Fig. 2 (b) are basic identical.
Fig. 2 (e) is the 5th embodiment of part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention, adopts PN junction as part flow arrangement.When PN junction added forward voltage, applying electrical potential had reduced potential barrier, and the result increases the movable charge carrier electric current that flows through PN junction because dissufion current has surpassed drift current; When PN junction added reverse voltage, potential barrier rose, and dissufion current is reduced, and drift current becomes to take as the leading factor, and electric current flows to the P district from the N district.Therefore, the effect during this is a unidirectional conductor, thereby can be good at isolating when positive charge, and shunts when reverse charging.
Above various embodiment also can mix use, that is adopt above method several simultaneously, and with the combination in any that modes such as the mixing of series, parallel, series connection and combination in parallel is connected are carried out, all include the explanation of this embodiment in.
Fig. 3 is the concrete enforcement figure that realizes part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention with PN junction.
Fig. 3 (a) is first embodiment that realizes part flow arrangement in expression the present invention a kind of electric voltage reverse-connection protection circuit with PN junction, and highly doped P+ active area is made among the N+ trap, forms PN junction.
Fig. 3 (b) is second embodiment that realizes part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention with PN junction, and highly doped P+ district is contacted with back-to-back mode with the N+ district, forms PN junction.
Fig. 3 (c) is second embodiment that realizes part flow arrangement in a kind of electric voltage reverse-connection protection circuit of expression the present invention with PN junction, and the P district is contacted with back-to-back mode with the N district, forms PN junction.
Limited part during above-mentioned embodiment is just used; other embodiments also include but not limited to described electric voltage reverse-connection protection circuit constituting by the some parts in the above unit, certain several part or all parts; and the present invention is not limited to these examples; and illustrate by the scope of claim, be included within the interest field that the present invention requires with all changes within the scope of the content of the scope equalization of claim and claim or variation.
Claims (4)
1. an electric voltage reverse-connection protection circuit comprises the electronic switch S that control unit circuit and its are controlled, and it is characterized in that it also comprises:
Part flow arrangement, one end connect the Vin-end of applied voltage, other end ground connection, and connect the reference voltage path at Rref place and the input signal end of control unit circuit simultaneously.
2. a kind of electric voltage reverse-connection protection circuit according to claim 1 is characterized in that, described electronic switch S can or other forms ofly can constitute according to the electronic device of conducting of voltage swing initialization circuit and disconnection by triode, field effect transistor.
3. a kind of electric voltage reverse-connection protection circuit according to claim 1; it is characterized in that, described part flow arrangement, its specific implementation can be following any one form; or the combination in any of several forms, combining form comprises that series, parallel, series connection and the parallel connection mixing of use simultaneously is connected:
Fixed resistance or variable resistor, or be equivalent to the various devices of resistance effect in the integrated circuit;
Diode, triode or field effect transistor;
Various forms of PN junctions.
4. a kind of electric voltage reverse-connection protection circuit according to claim 1; it is characterized in that; described part flow arrangement; the reference voltage path at the Rref place of its connection; can be connected on voltage output end Vout+ port; also can be connected on voltage input end Vin+ port, perhaps connect Vout+ port and Vin+ port simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100366817A CN101222147A (en) | 2007-01-14 | 2007-01-14 | Electric voltage reverse-connection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100366817A CN101222147A (en) | 2007-01-14 | 2007-01-14 | Electric voltage reverse-connection protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101222147A true CN101222147A (en) | 2008-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100366817A Pending CN101222147A (en) | 2007-01-14 | 2007-01-14 | Electric voltage reverse-connection protection circuit |
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| CN (1) | CN101222147A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826724A (en) * | 2010-03-09 | 2010-09-08 | 海洋王照明科技股份有限公司 | Anti-reverse connection circuit of direct current power supply |
| CN101651352B (en) * | 2008-08-11 | 2011-11-30 | 聚积科技股份有限公司 | Light energy power circuit |
| CN104022541A (en) * | 2013-02-28 | 2014-09-03 | 精工电子有限公司 | Charge and discharge control circuit and battery device |
| CN104578026A (en) * | 2013-10-17 | 2015-04-29 | 富士电机株式会社 | Semiconductor device |
| CN108594133A (en) * | 2018-05-18 | 2018-09-28 | 向玲丽 | A kind of lithium battery pressure differential detection circuit |
-
2007
- 2007-01-14 CN CNA2007100366817A patent/CN101222147A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651352B (en) * | 2008-08-11 | 2011-11-30 | 聚积科技股份有限公司 | Light energy power circuit |
| CN101826724A (en) * | 2010-03-09 | 2010-09-08 | 海洋王照明科技股份有限公司 | Anti-reverse connection circuit of direct current power supply |
| CN101826724B (en) * | 2010-03-09 | 2013-10-23 | 海洋王照明科技股份有限公司 | Anti-reverse connection circuit of direct current power supply |
| CN104022541A (en) * | 2013-02-28 | 2014-09-03 | 精工电子有限公司 | Charge and discharge control circuit and battery device |
| CN104578026A (en) * | 2013-10-17 | 2015-04-29 | 富士电机株式会社 | Semiconductor device |
| CN104578026B (en) * | 2013-10-17 | 2019-08-16 | 富士电机株式会社 | Semiconductor device |
| CN108594133A (en) * | 2018-05-18 | 2018-09-28 | 向玲丽 | A kind of lithium battery pressure differential detection circuit |
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Addressee: Cao Xianguo Document name: Notification of Publication of the Application for Invention |
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Open date: 20080716 |