CN2704149Y - Electronic circuit water-proofing device - Google Patents
Electronic circuit water-proofing device Download PDFInfo
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- CN2704149Y CN2704149Y CN 03256565 CN03256565U CN2704149Y CN 2704149 Y CN2704149 Y CN 2704149Y CN 03256565 CN03256565 CN 03256565 CN 03256565 U CN03256565 U CN 03256565U CN 2704149 Y CN2704149 Y CN 2704149Y
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- field effect
- effect transistor
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- battery
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Abstract
The utility model relates to a water-proofing protection circuit based on the function of over current and over load protection, comprising a basal plate, an electronic switch, and a water trigger circuit arranged on the basal plate. The electronic switch can consist of a field effect transistor or other electronic elements. When the electronic switch consists of a field effect transistor, the source electrode of the field effect transistor is connected to the anode of the load electronic circuit, and the drain electrode of the field effect transistor is connected to the minus pole of the load electronic circuit. The water trigger circuit is connected to the grid of the field effect transistor. The utility model has the advantages of that the utility model has simple structure, simple circuit, low cost, and convenient implementation; the implementation can be conducted without changing the circuit of the original and used electronic product; the electronic product doesn't need to be conducted water-proofing sealing processing; the property and the function of the original electric product cannot be affected; the using habit of the user of the original electric product also cannot be affected.
Description
One, technical field:
The utility model relates to the water-tight device on the electronic product, is a kind of based on the new waterproof protective circuit on the over-current and-load defencive function basis.
Two, background technology:
At present, after portable type electronic product is drenched by water or is immersed in water, under situation about powering up, because the electrochemical reaction result causes electronic circuit to be damaged, even scraps.In order to address the above problem several measures below general the employing.
1. adopt electronic circuit is carried out the measure of waterproof sealing.As: Siemens's 3518 type mobile phones, it has water-proof function, but the charging jack of this mobile phone all must be blocked up, and under the locked situation of this battery of mobile phone cover latch, the electronic circuit of this mobile phone reaches the purpose of waterproofing protection by sealing, but like this its complex structure, also brought a lot of inconvenience for the user; As the charging plug or the earphone jack of this mobile phone being blocked up because of having forgotten, the water-proof function of this mobile phone is performed practically no function.
2. adopting the patent No. is the electronic circuit water-proof device of ZL 02 2 30586.6.The field effect transistor of its electronic circuit water-proof device inside after immersion is cut off battery and load circuit automatically, stops the electronic circuit of electronic product that electrochemical reaction takes place in water, to play the portable type electronic product waterproof effect.Because this electronic circuit water-proof device is to be connected between battery and the load circuit.Though adopt the Low ESR field effect transistor as switch element.But can between the input of field effect transistor and output, produce certain voltage drop, thereby the loss that has increased battery.Reduced the stand-by time of battery.Especially for the portable type electronic products that adopt the low pressure chipsets later in a large number, the problem of pressure drop of its generation will be more outstanding.Both just adopt the method for a plurality of field effect transistor parallel connections, and can increase cost again.
3. present, most electronic products and inside battery all have the over-current and-load defencive function.And this over-current and-load defencive function afterwards portable type electronic product and the protective circuit of lithium battery in be must be obligato.Power supply should not damage when carrying out short circuit experiment according to regulation in 6.11 to 6.13 chapters and sections in State Standard of the People's Republic of China GB/T13722-1992 mobile communication power supply specification requirement and the experimental technique, and should satisfy the specification requirement in 6.1 to 6.5 chapters and sections and provided concrete method of measurement in 11.9 chapters and sections after the experiment; Should shut down when clearly the regulation output current exceeds nominal value 120% in 4.15 chapters and sections in the DC-to-DC modular power source industry standard according to communication technology standard YD/T 733-1994 communication; Stipulate in the technical indicator about lithium ion battery with 4.8.3 chapters and sections in lithium ion power supply and the charger industry standard and 5.10.3 chapters and sections according to the YD/T998.1-1999 mobile phone: with power positive cathode short circuit 1h, sample should not have distortion, explosion, fire, cigarette and transudate.Both positive and negative polarity is disconnected, measure power end voltage with voltmeter after the instantaneous charging, power end voltage should be able to recover.Stipulated in the above national standard that DC-DC power supply module and the battery in the portable type electronic product should possess the defencive function that cuts off battery and load automatically behind the over-current and-load.Because after battery and the electronic product immersion; also can increase the electric current of battery to the electronic product though glassware for drinking water has certain conductivity can make electronic circuit electric leakage and electrochemical reaction takes place in water, these electric currents are much smaller than the starting current of over-current and-load defencive function.Therefore the over-current and-load defencive function can not cut off battery and load circuit under the situation of this water inlet.So this over-current and-load defencive function does not possess the electronic circuit water-proof defencive function.
Three, summary of the invention:
The utility model solved with electronic technology on the basis of over-current and-load defencive function electronic product drenched by water or be immersed in water after cause impaired problem.
The utility model reaches by the following technical programs: this new waterproof protective circuit comprises substrate, electronic switch and water circuits for triggering, and electronic switch and water circuits for triggering are contained on the substrate, and electronic switch can be realized by field effect transistor or other electron component.When making electronic switch with field effect transistor, the source S of field effect transistor connects the positive pole of battery or the electrode input end of load.The drain D of field effect transistor connects the negative pole of battery or the negative input of load.The water circuits for triggering connect the grid of field effect transistor.
Above-mentioned field effect transistor adopts P-channel field-effect transistor (PEFT) pipe or N channel field-effect pipe.
When above-mentioned field effect transistor adopted the P-channel field-effect transistor (PEFT) pipe, the source S of field effect transistor connect the positive pole of battery or the electrode input end of load.The drain D of field effect transistor connects the negative pole of battery or the negative input of load; When above-mentioned field effect transistor adopted N channel field-effect pipe, the drain D of field effect transistor connect the positive pole of battery or the electrode input end of load.The source S of field effect transistor connects the negative pole of battery or the negative input of load.
The positive pole of above-mentioned battery and negative pole are the charging end of battery.
When above-mentioned water circuits for triggering comprise a NPN type triode, P-channel field-effect transistor (PEFT) pipe and resistance.The grid G of field effect transistor is connected by the source S of first resistance and field effect transistor, and the collector electrode c of the grid G of field effect transistor and a NPN type triode is connected.The emitter e of this triode and the drain D of field effect transistor are connected.The base stage b of this triode and water trigger end are connected.
When above-mentioned water circuits for triggering comprise the first positive-negative-positive triode, P-channel field-effect transistor (PEFT) pipe and resistance.The grid of field effect transistor is connected by the source electrode of first resistance and field effect transistor, and the emitter e of the grid of field effect transistor and the first positive-negative-positive triode is connected.The collector electrode c of this triode and the drain electrode of field effect transistor are connected.The base stage b of this triode and water trigger end are connected.
When above-mentioned water circuits for triggering comprise the first positive-negative-positive triode, N channel field-effect pipe and resistance.The grid of field effect transistor is connected by the source electrode of first resistance and field effect transistor, and the collector electrode c of the grid of field effect transistor and the first positive-negative-positive triode is connected.The emitter e of this triode and the drain electrode of field effect transistor are connected.The base stage b of this triode and water trigger end are connected.
When above-mentioned water circuits for triggering comprise a NPN type triode, N channel field-effect pipe and resistance.The grid G of field effect transistor is connected by the source S of first resistance and field effect transistor, and the emitter e of the grid G of field effect transistor and a NPN type triode is connected.The collector electrode c of this triode and the drain D of field effect transistor are connected.The base stage b of this triode and water trigger end are connected.
Operation principle of the present utility model: shown in figure one, under normal condition, electronic switch is in cut-off state, makes battery give the power electronics of electronic product; After electronic product was drenched by water or is immersed in water, the water circuits for triggering start made electronic switch be in conducting state.Thereby, the over-current and-load defencive function of battery or load circuit inside is started with the both positive and negative polarity short circuit of battery.Thereby cut off the power electronics that battery is given electronic product.Under the situation that does not have electricity, electronic product will significantly reduce even not have electrochemical reaction in water like this.Therefore just can play to drenched by water or be immersed in water after the protective effect of electronic product; After electronic product and the thorough oven dry of electronic circuit quilt thereof, power up again, the water circuits for triggering make electronic switch recover cut-off state immediately after dewatering, thereby make electronic product recover normal operating conditions.
Advantage of the present utility model is: simple in structure, circuit is also simple, cost is low, be convenient to implement, do not need the electronic circuit of former already used electronic product is just changed and can be implemented, easy to use, can not need that electronic product is carried out waterproof sealing and handle, do not influence the performance and the function of primary electron product, do not influence primary electron end user's use habit yet.
Four, description of drawings:
Fig. 1 is a fundamental diagram of the present utility model;
Fig. 2 is the structural representation of the utility model embodiment 1;
Fig. 3 is the structural representation of the utility model embodiment 2;
Fig. 4 is the structural representation of the utility model embodiment 3;
Fig. 5 is the structural representation of the utility model embodiment 4.
Among the figure: 1.; 2. be the positive pole of battery or the electrode input end of load circuit; 3. be the negative pole of battery or the negative input of load circuit.A is a substrate; T is a field effect transistor; S is the source electrode of field effect transistor; D is the drain electrode of field effect transistor; G is the grid of field effect transistor.Q1 is a NPN type triode or the first positive-negative-positive triode.B is the base stage of triode; C is the collector electrode of triode; E is the emitter of triode; R1 is first resistance.
Five, embodiment:
Embodiment 1:
As depicted in figs. 1 and 2, this electronic circuit water-proof device comprises substrate A, electronic switch and water circuits for triggering.Electronic switch and water circuits for triggering are contained on the substrate A, and electronic switch can be made of field effect transistor and other electron component.Constitute by field effect transistor T at this electronic switch.Wherein:
As shown in Figure 2, electronic switch comprises the field effect transistor T and first resistance R 1, field effect transistor T adopts the P-channel field-effect transistor (PEFT) pipe, the electrode input end 2 of the source S of field effect transistor T and the positive pole of battery or load circuit is connected, the negative input 3 of the drain D of field effect transistor T and the negative pole of battery or load circuit is connected, and the grid G of field effect transistor T is connected by the source S of first resistance R 1 with field effect transistor T; The water circuits for triggering comprise a NPN type triode Q1, base stage b and the water trigger end 1 of the one NPN type triode Q1 are connected, the collector electrode c of the one NPN type triode Q1 and the grid G of field effect transistor T are connected, and the emitter e of a NPN type triode Q1 and the drain D of field effect transistor T are connected.
The operation principle of embodiment 1: under initial condition, the grid G of field effect transistor T is connected by first resistance R 1 and the positive pole of battery or the electrode input end of load circuit.Therefore the grid G of field effect transistor T is in high level, and source S and the drain D of field effect transistor T are in cut-off state.At this moment battery is given the load circuit normal power supply; After battery, load and anti-water circuit are drenched by water or are immersed in water, because the electric action of water is raised water trigger end 1 current potential of water circuits for triggering, thereby make collector electrode c and the emitter e conducting of a NPN type triode Q1, make the grid G of field effect transistor T become low level by original high level.Thereby make source S and the drain D conducting of field effect transistor T, with the both positive and negative polarity short circuit of power supply.Cause the over-current and-load defencive function of battery or load circuit inside to start, thereby cut off the power supply that battery is given load circuit.This moment, electronic circuit water-proof device returned to initial condition (source S and the drain D that are field effect pipe T are in cut-off state) because of dead electricity.Like this under the situation that is not having electricity, the electronic circuit on the electronic product will significantly reduce or even do not have an electrochemical reaction, therefore just can play to drenched by water or be immersed in water after the protective effect of electronic product; Behind the electronic circuit and the thorough oven dry of battery quilt of electronic product, will can power by the bio-occlusion electronic product after the instantaneous charging activation of battery.
Embodiment 2:
As shown in figures 1 and 3, difference from Example 1 is that triode Q1 adopts the positive-negative-positive triode.The water circuits for triggering comprise the first positive-negative-positive triode Q1 as shown in figures 1 and 3, the base stage b of this triode Q1 is connected with water trigger end 1, the emitter e of this triode Q1 is connected with the grid G of field effect transistor T, and the collector electrode c of this triode Q1 is connected with the drain D of field effect transistor T; Electronic switch comprises the field effect transistor T and first resistance R 1, field effect transistor T adopts the P-channel field-effect transistor (PEFT) pipe, the electrode input end 2 of the source S of field effect transistor T and the positive pole of battery or load circuit is connected, the negative input 3 of the drain D of field effect transistor T and the negative pole of battery or load circuit is connected, and the grid G of field effect transistor T is connected by the source S of first resistance R 1 with field effect transistor T.
Embodiment 3: the difference with embodiment 1 and example 2 is that electronic switch comprises the field effect transistor T and first resistance R 1 as shown in Figure 1 and Figure 4, field effect transistor T adopts N channel field-effect pipe, the electrode input end 2 of the drain D of field effect transistor T and the positive pole of battery or load circuit is connected, the negative input 3 of the source S of field effect transistor T and the negative pole of battery or load circuit is connected, and the grid G of field effect transistor T is connected by the source S of first resistance R 1 with field effect transistor T; The water circuits for triggering comprise a NPN type triode Q1, base stage b and the water trigger end 1 of the one NPN type triode Q1 are connected, the emitter e of the one NPN type triode Q1 and the grid G of field effect transistor T are connected, and the collector electrode c of a NPN type triode Q1 and the drain D of field effect transistor T are connected.
Embodiment 4 is as Fig. 1 and shown in Figure 5, with embodiment 1, example 2, the difference of example 3: electronic switch comprises the field effect transistor T and first resistance R 1, field effect transistor T adopts N channel field-effect pipe, the electrode input end 2 of the drain D of field effect transistor T and the positive pole of battery or load circuit is connected, and the negative input 3 of the source S of field effect transistor T and the negative pole of battery or load circuit is connected, and the grid G of field effect transistor T is connected by the source S of first resistance R 1 with field effect transistor T; The water circuits for triggering comprise the first positive-negative-positive triode Q1, base stage b and the water trigger end 1 of the first positive-negative-positive triode Q1 are connected, the collector electrode c of the first positive-negative-positive triode Q1 and the grid G of field effect transistor T are connected, and the emitter e of the first positive-negative-positive triode Q1 and the drain D of field effect transistor T are connected.
Embodiment 4 is basic identical with the operation principle of embodiment 3, and only difference is: replaced NPN type triode with the positive-negative-positive triode, the triggering level of water circuits for triggering is different.
Substrate in the utility model can be the substrate of circuit board or integrated circuit, and its circuit board can be flexible PCB or rigid circuit board.Circuit of the present utility model can be contained on the circuit board, perhaps circuit of the present utility model be contained in the integrated circuit, perhaps circuit of the present utility model is contained on the battery, perhaps circuit of the present utility model can be contained on the circuit board of electronic product.
Claims (6)
1. a novel electronic circuit is prevented hydrophone; comprise battery over-current and-load protective circuit; this battery over-current and-load protective circuit comprises that battery protection integrated circuit and responsive discharging current thereof detect input, the cathode output end of battery and the cathode output end of battery, and the output that the responsive discharging current that it is characterized in that the battery protection integrated circuit detects input and water circuits for triggering is conducted or the cathode output end of battery and the output of water circuits for triggering are conducted.
2. novel electronic circuit according to claim 1 is prevented hydrophone, it is characterized in that the water circuits for triggering comprise that electronic switch is the field effect pipe, transistor and water trigger end, the input of this field effect transistor and the cathode output end of battery are conducted, the control end of this field effect transistor and the input of triode are conducted, be connected to first resistance between the input of transistor and the cathode output end of battery, the output of transistor and the output of field effect transistor are conducted, the water trigger end of the control end of transistor and water circuits for triggering is conducted, and the output of field effect transistor is the output of water circuits for triggering.
3. novel electronic circuit according to claim 1 is prevented hydrophone, it is characterized in that the water circuits for triggering comprise that electronic switch is the field effect pipe, transistor and water trigger end, the input of this field effect transistor and the cathode output end of battery are conducted, the control end of this field effect transistor and the output of transistor are conducted, the input of transistor and the cathode output end of battery are conducted, be connected to first resistance between the output of transistor and the cathode output end of battery, the water trigger end of the control end of transistor and water circuits for triggering is conducted, and the output of field effect transistor is the output of water circuits for triggering.
4. according to claim 1 or the anti-hydrophone of 2 or 3 described novel electronic circuits, it is characterized in that field effect transistor adopts P-channel field-effect transistor (PEFT) pipe or N channel field-effect pipe.
5. according to claim 1 or the anti-hydrophone of 2 or 3 described novel electronic circuits, it is characterized in that transistor adopts negative-positive-negative transistor or positive-negative-positive transistor.
6. novel electronic circuit according to claim 4 is prevented hydrophone, it is characterized in that transistor adopts negative-positive-negative transistor or positive-negative-positive transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03256565 CN2704149Y (en) | 2003-04-23 | 2003-04-23 | Electronic circuit water-proofing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03256565 CN2704149Y (en) | 2003-04-23 | 2003-04-23 | Electronic circuit water-proofing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2704149Y true CN2704149Y (en) | 2005-06-08 |
Family
ID=34755423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03256565 Expired - Fee Related CN2704149Y (en) | 2003-04-23 | 2003-04-23 | Electronic circuit water-proofing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2704149Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471559B (en) * | 2007-12-27 | 2010-12-29 | 深圳富泰宏精密工业有限公司 | Protection circuit |
| WO2014063502A1 (en) * | 2012-10-26 | 2014-05-01 | 小米科技有限责任公司 | Device protection apparatus and safety circuit |
| CN105140900A (en) * | 2015-09-09 | 2015-12-09 | 成都川睿科技有限公司 | Lightning protection power socket of intelligent traffic system |
| CN108199351A (en) * | 2017-12-20 | 2018-06-22 | 西安易朴通讯技术有限公司 | A kind of terminal |
-
2003
- 2003-04-23 CN CN 03256565 patent/CN2704149Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101471559B (en) * | 2007-12-27 | 2010-12-29 | 深圳富泰宏精密工业有限公司 | Protection circuit |
| WO2014063502A1 (en) * | 2012-10-26 | 2014-05-01 | 小米科技有限责任公司 | Device protection apparatus and safety circuit |
| CN105140900A (en) * | 2015-09-09 | 2015-12-09 | 成都川睿科技有限公司 | Lightning protection power socket of intelligent traffic system |
| CN108199351A (en) * | 2017-12-20 | 2018-06-22 | 西安易朴通讯技术有限公司 | A kind of terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |