CN101635450A - Circuit water-proof device - Google Patents
Circuit water-proof device Download PDFInfo
- Publication number
- CN101635450A CN101635450A CN200810132150A CN200810132150A CN101635450A CN 101635450 A CN101635450 A CN 101635450A CN 200810132150 A CN200810132150 A CN 200810132150A CN 200810132150 A CN200810132150 A CN 200810132150A CN 101635450 A CN101635450 A CN 101635450A
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- circuit
- battery
- water
- proof device
- effect transistor
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- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A circuit water-proof device relates to improvement on the structure of a water-proof device, in particular to a circuit water-proof device capable of automatically cutting off the power output of a battery when wet. The circuit water-proof device is mainly used for circuit waterproofing in portable electronic products such as mobile phones, digital video cameras and the like. The invention provides the circuit water-poof device capable of immediately cutting off the power output of the battery when wet. The circuit water-proof device comprises a battery protective circuit, a first field effect transistor and a second field effect transistor; and the battery protective circuit comprises a battery protective integrated circuit. The circuit water-proof device is characterized in that the sensitive-discharge current-detection input end of the battery protective integrated circuit is connected with a water trigger circuit, and the anode and the cathode of the battery are connected with the battery protective circuit and a load circuit respectively.
Description
Technical field:
The present invention relates to the improvement of anti-hydrophone structure, relates in particular to a kind of circuit water-proof device that can cut off battery supply output automatically behind the water of meeting, and is mainly used in the circuit water-proof of portable type electronic products such as mobile phone, Digital Video.
Background technology:
At present, the lithium battery protection circuit of portable type electronic products such as existing mobile phone, Digital Video only has over-charge protective mostly, crosses and put four kinds of defencive functions such as protection, overcurrent protection, short-circuit protection.Lithium battery protection circuit the most salable in the market is made up of the cathode output end of battery protection integrated circuit, first field effect transistor, second field effect transistor, battery and the cathode output end of battery; though its over-charge protective, mistake are put functions such as protection, overcurrent protection, short-circuit protection and can be played good protection effect; but this lithium battery protection circuit can only protect this lithium cell not to be damaged, and but can not protect the water inlet of load electronic circuit not to be damaged later.Usually this phenomenon can take place in daily life: because after load electronic circuit (as: portable type electronic products such as mobile phone, Digital Video) falls into the water accidentally; this lithium battery protection circuit can not be cut off the electricity supply automatically; therefore the short circuit of load electronic circuit can take place; phenomenon such as burn; cause the load electronic circuit to damage even scrap, brought puzzlement to people.
Summary of the invention:
The present invention is exactly at the problems referred to above, and a kind of circuit water-proof device that can cut off the power supply output of battery when meeting water immediately is provided.
For achieving the above object, the present invention adopts following technical scheme to realize: a kind of circuit water-proof device comprises battery protecting circuit, first field effect transistor, second field effect transistor; Described battery protecting circuit comprises the battery protection integrated circuit; the responsive discharging current detection input that it is characterized in that described battery protection integrated circuit links to each other with the water circuits for triggering, and the positive pole of battery and negative pole link to each other with battery protecting circuit and load circuit respectively.
Beneficial effect of the present invention:
1, have water-proof function:
Link to each other with the water circuits for triggering because the responsive discharging current of battery protection integrated circuit of the present invention detects input, the positive pole of battery and negative pole link to each other with battery protecting circuit and load circuit respectively; Just make the present invention in the performance that does not influence the primary electron product, under the situation of function and using method, not only has over-charge protective, cross and put protection, overcurrent protection, four kinds of defencive functions such as short-circuit protection, also has the function that when meeting water, can cut off battery supply output immediately, thereby make load electronic circuit product, as: mobile phone, portable type electronic products such as Digital Video, do not needing it is carried out under the situation that waterproof sealing handles, drenched by water or the water logging bubble after, only need dry to wait to operate and get final product, still can continue to use, and not influence the performance and the function of primary electron product;
2, simple in structure:
Of the present invention simple in structure, cost is low, is convenient to implement, and is convenient to popularize.
Description of drawings:
Fig. 1 is a fundamental diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment:
Below in conjunction with accompanying drawing the present invention is further described:
As shown in Figure 1, a kind of circuit water-proof device comprises battery protecting circuit, first field effect transistor, second field effect transistor; Described battery protecting circuit comprises the battery protection integrated circuit, and the responsive discharging current of described battery protection integrated circuit detects input and links to each other with the water circuits for triggering, and the positive pole of battery and negative pole link to each other with battery protecting circuit and load circuit respectively.
As shown in Figure 2, battery protecting circuit comprises battery protection integrated circuit U1, the first field effect transistor V1, the second field effect transistor V2, and the positive pole of battery links to each other with the negative pole of battery through fuse, load circuit, the first field effect transistor V1 and the second field effect transistor V2; The responsive discharging current of battery protection integrated circuit U1 detects input CS and links to each other through the grid of resistance R 2 with the second field effect transistor V2, and input OC links to each other through the grid of resistance R 3 with the second field effect transistor V2; Between the source electrode of the first field effect transistor V1 and the second field effect transistor V2 and drain electrode, be connected with diode VD1, VD2 respectively; Be in series with resistance R 1 between the VCC pin of anode and battery protection integrated circuit U1, string has capacitor C 1 between the VCC pin of resistance R 1 and battery protection integrated circuit U1.
Under normal condition, it is low level that the responsive discharging current of battery protection integrated circuit U1 detects input CS, make the mistake of battery protection integrated circuit U1 put the grid that protection control end OD output high level is delivered to the first field effect transistor V1, make drain electrode and the source electrode conducting of the first field effect transistor V1, thereby make the negative pole conducting of the battery of the negative input of battery and circuit water-proof device of the present invention, power supply output is arranged; Cathode output end when the battery of circuit water-proof device of the present invention; cathode output end and when being subjected to water induction end FS to be subjected to water simultaneously; under the electric action of water; the conducting that is triggered of water circuits for triggering; the responsive discharging current that the high potential of the cathode output end of battery is delivered to battery protection integrated circuit U1 by the water circuits for triggering detects input CS; when current potential surpasses 200 millivolts; the mistake of battery protection integrated circuit U1 is put protection control end OD output low level; the grid potential of the first field effect transistor V1 is dragged down, cause the drain electrode of the first field effect transistor V1 and source electrode to disconnect the waterproofing protection state that enters.This waterproofing protection state will last till to disconnect between the cathode output end of battery of load circuit and circuit water-proof device of the present invention and the cathode output end always not to be had till the Mechanical Contact, and this moment, circuit water-proof device of the present invention automatically restored to the normal power supply state.
Claims (1)
1, a kind of circuit water-proof device comprises battery protecting circuit, first field effect transistor, second field effect transistor; Described battery protecting circuit comprises the battery protection integrated circuit; the responsive discharging current detection input that it is characterized in that described battery protection integrated circuit links to each other with the water circuits for triggering, and the positive pole of battery and negative pole link to each other with battery protecting circuit and load circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810132150A CN101635450A (en) | 2008-07-21 | 2008-07-21 | Circuit water-proof device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810132150A CN101635450A (en) | 2008-07-21 | 2008-07-21 | Circuit water-proof device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101635450A true CN101635450A (en) | 2010-01-27 |
Family
ID=41594548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810132150A Pending CN101635450A (en) | 2008-07-21 | 2008-07-21 | Circuit water-proof device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101635450A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122733A1 (en) * | 2011-03-15 | 2012-09-20 | 中兴通讯股份有限公司 | Water immersion protection apparatus for an electronic device |
| CN106786343A (en) * | 2016-11-25 | 2017-05-31 | 北京小米移动软件有限公司 | Smart machine with waterproofing protection |
| CN107193316A (en) * | 2016-03-15 | 2017-09-22 | 北京航天斯达科技有限公司 | A kind of bus isolation circuit of anti-short-circuit protection |
-
2008
- 2008-07-21 CN CN200810132150A patent/CN101635450A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012122733A1 (en) * | 2011-03-15 | 2012-09-20 | 中兴通讯股份有限公司 | Water immersion protection apparatus for an electronic device |
| CN107193316A (en) * | 2016-03-15 | 2017-09-22 | 北京航天斯达科技有限公司 | A kind of bus isolation circuit of anti-short-circuit protection |
| CN106786343A (en) * | 2016-11-25 | 2017-05-31 | 北京小米移动软件有限公司 | Smart machine with waterproofing protection |
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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: 20100127 |