CN203536944U - A cell phone waterproof protection circuit - Google Patents
A cell phone waterproof protection circuit Download PDFInfo
- Publication number
- CN203536944U CN203536944U CN201320683732.6U CN201320683732U CN203536944U CN 203536944 U CN203536944 U CN 203536944U CN 201320683732 U CN201320683732 U CN 201320683732U CN 203536944 U CN203536944 U CN 203536944U
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- resistance
- cell phone
- voltage comparator
- pin
- mobile phone
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Abstract
The utility model discloses a cell phone waterproof protection circuit and resolves a problem that water enters a cell phone and causes short circuit so as to damage the cell phone. The cell phone waterproof protection circuit comprises a cell phone power supply VCC and a cell phone circuit board. The cell phone power supply VCC is connected with ground via a resistor R1 and a resistor R2. The electric potential of a joint between the resistor R1 and the resistor R2 is used as reference voltage to be connected with the non-inverting input end pin 3 of a voltage comparator U1A. The cell phone power supply VCC is also connected with ground via a resistor R4 and a resistor R3. The electric potential of a joint between the humidity-sensitive resistor R4 and the resistor R3 are used as input voltage to be connected with the inverting input end pin 2 of the voltage comparator U1A. The cell phone power supply VCC is connected with the pin 8 of the voltage comparator U1A to provide power. The pin 4 of the voltage comparator U1A is connected with ground. The output end pin 1 of the voltage comparator U1A is connected with a NMOS switching transistor V1 via a R5 to control the on-off state of a loop through which the cell phone power supply VCC provides power for the cell phone circuit board. The cell phone waterproof protection circuit is used as a protection circuit between the cell phone power supply and the cell phone circuit board.
Description
technical field:
The utility model relates to a kind of preventing mobile phone water conservation circuit, belongs to electronic circuit technology field.
background technology:
Mobile phone has become a kind of article that people carry, and many people once had because of the experience in careless mobile phone landing water, because water enters interior of mobile phone, causes short circuit that mobile phone is damaged.
Existing mobile phone is in order to protect because causing mobile phone to damage the method that the employing having adds dustproof, waterproof and anti-scratch containment vessel in careless mobile phone water inlet; some employings add printed circuit board protective film method; all there is the risk of infiltration, cannot in mobile phone water inlet, automatically cut off immediately cellular phone power supplies.
summary of the invention:
The purpose of this utility model is that the problem for above-mentioned existence provides a kind of preventing mobile phone water conservation circuit; adopt increase humistor electric circuit inspection mobile phone whether to intake; once judge into water, turn-off immediately power supply, avoid mobile phone circuit short circuit to cause mobile phone to damage.
Above-mentioned object realizes by following technical scheme:
Preventing mobile phone water conservation circuit, comprises cellular phone power supplies VCC and circuit board of mobile phone, and described cellular phone power supplies VCC is by resistance R 1, resistance R 2 ground connection, and the tie point current potential of resistance R 1, resistance R 2 connects in-phase input end 3 pin of voltage comparator U1A as reference voltage; Cellular phone power supplies VCC is by humistor R4, resistance R 3 ground connection, and the tie point current potential of humistor R4, resistance R 3 connects inverting input 2 pin of voltage comparator U1A as input voltage; 8 pin that cellular phone power supplies VCC meets voltage comparator U1A provide power supply, the 4 pin ground connection of voltage comparator U1A; Output 1 pin of voltage comparator U1A meets nmos switch pipe V1 by R5 and controls the switching that cellular phone power supplies VCC is described circuit board of mobile phone current supply circuit.
Described preventing mobile phone water conservation circuit, described voltage comparator U1A adopts LM393 series voltage comparator.
Described preventing mobile phone water conservation circuit, described resistance R 1, resistance R 2, resistance R 3 are 20k Ω resistance, resistance R 5 is 3k Ω resistance.
Beneficial effect:
Whether the utility model adopts increase humistor electric circuit inspection mobile phone to intake, once judge into water, turn-offs immediately power supply, avoids mobile phone circuit short circuit to cause mobile phone to damage.Can be used alone, can merge use with traditional methods such as diaphragm that add again, increase the protection because of careless water inlet to mobile phone.Circuit is simple, practical.
accompanying drawing explanation:
Fig. 1 is circuit diagram of the present utility model.
embodiment:
As shown in Figure 1, in figure, BT1 is battery of mobile phone, and cellular phone power supplies VCC is provided; Cellular phone power supplies VCC is by resistance R 1, resistance R 2 ground connection, and resistance R 1, resistance R 2 tie point current potentials connect in-phase input end 3 pin of U1A voltage comparator LM393 as reference voltage; Cellular phone power supplies VCC is by humistor R4, resistance R 3 ground connection, and humistor R4, resistance R 3 tie point current potentials connect inverting input 2 pin of U1A voltage comparator LM393 as input voltage; Cellular phone power supplies VCC connects 8 pin of U1A voltage comparator LM393, and power supply is provided, the 4 pin ground connection of voltage comparator LM393; It is the switching of circuit board of mobile phone current supply circuit that output 1 pin of voltage comparator LM393 meets nmos switch pipe V1 control VCC by R5.
Under normal circumstances, humistor R4 is high value state, and humistor R4, resistance R 3 tie point current potentials are lower than resistance R 1, resistance R 2 tie point current potentials, and 1 pin of U1 is exported high level, nmos switch pipe V1 conducting, the conducting of mobile phone power supply circuits.
After water inlet, humistor R4 resistance declines, and humistor R4, resistance R 3 tie point current potentials are higher than resistance R 1, resistance R 2 tie point current potentials, and the 1 pin output low level of U1, disconnects mobile phone power supply circuits.
Described preventing mobile phone water conservation circuit, described resistance R 1, resistance R 2, resistance R 3 are 20k Ω resistance, resistance R 5 is 3k Ω resistance.
Claims (3)
1. a preventing mobile phone water conservation circuit, comprise cellular phone power supplies VCC and circuit board of mobile phone, it is characterized in that: described cellular phone power supplies VCC is by resistance R 1, resistance R 2 ground connection, and the tie point current potential of resistance R 1, resistance R 2 connects in-phase input end 3 pin of voltage comparator U1A as reference voltage; Cellular phone power supplies VCC is by humistor R4, resistance R 3 ground connection, and the tie point current potential of humistor R4, resistance R 3 connects inverting input 2 pin of voltage comparator U1A as input voltage; 8 pin that cellular phone power supplies VCC meets voltage comparator U1A provide power supply, the 4 pin ground connection of voltage comparator U1A; Output 1 pin of voltage comparator U1A meets nmos switch pipe V1 by R5 and controls the switching that cellular phone power supplies VCC is described circuit board of mobile phone current supply circuit.
2. preventing mobile phone water conservation circuit according to claim 1, is characterized in that: described voltage comparator U1A adopts LM393 series voltage comparator.
3. preventing mobile phone water conservation circuit according to claim 1 and 2, is characterized in that: described resistance R 1, resistance R 2, resistance R 3 are 20k Ω resistance, and resistance R 5 is 3k Ω resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320683732.6U CN203536944U (en) | 2013-11-01 | 2013-11-01 | A cell phone waterproof protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320683732.6U CN203536944U (en) | 2013-11-01 | 2013-11-01 | A cell phone waterproof protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203536944U true CN203536944U (en) | 2014-04-09 |
Family
ID=50423120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320683732.6U Expired - Fee Related CN203536944U (en) | 2013-11-01 | 2013-11-01 | A cell phone waterproof protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203536944U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742874A (en) * | 2017-09-27 | 2018-02-27 | 深圳市华星光电技术有限公司 | A kind of power management integrated circuit and the liquid crystal display panel using the circuit |
| CN108366146A (en) * | 2018-03-12 | 2018-08-03 | 曹颖鹏 | A kind of mobile phone water proof type circuit |
-
2013
- 2013-11-01 CN CN201320683732.6U patent/CN203536944U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742874A (en) * | 2017-09-27 | 2018-02-27 | 深圳市华星光电技术有限公司 | A kind of power management integrated circuit and the liquid crystal display panel using the circuit |
| CN108366146A (en) * | 2018-03-12 | 2018-08-03 | 曹颖鹏 | A kind of mobile phone water proof type circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20161101 |