CN202662068U - Device used to protect card reader in intelligent vehicle-mounted terminal - Google Patents
Device used to protect card reader in intelligent vehicle-mounted terminal Download PDFInfo
- Publication number
- CN202662068U CN202662068U CN 201220369647 CN201220369647U CN202662068U CN 202662068 U CN202662068 U CN 202662068U CN 201220369647 CN201220369647 CN 201220369647 CN 201220369647 U CN201220369647 U CN 201220369647U CN 202662068 U CN202662068 U CN 202662068U
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- CN
- China
- Prior art keywords
- card reader
- low pressure
- pressure difference
- voltage regulator
- linear voltage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a device used to protect a card reader in an intelligent vehicle-mounted terminal. The device used to protect the card reader in the intelligent vehicle-mounted terminal comprises a power source, a low dropout liner regulator and the card reader, wherein an input pin of the low dropout liner regulator is connected with the power source, an output pin of the low dropout liner regulator is connected with the card reader, a vacant pin of the low dropout liner regulator is connected with a capacitor, and the other end of the capacitor, opposite to the end connecting with the vacant pin end of the low dropout liner regulator, is grounded. By adopting the structure, when the power source supplies power for the card reader, the low dropout liner regulator can delay output of voltage inside the low dropout liner regulator, and therefore the phenomenon that the card reader is damaged because of receiving instant high voltage can be avoided.
Description
Technical field
The utility model relates to the intelligent transportation system field, specifically the device of protection card reader in the intelligent vehicle mounted terminal.
Background technology
Intelligent transportation system, be effective applications such as infotech, data communication technology, Electronic transducer technology and Computer Processing technology with the advanced person in whole traffic control system, it has the advantages such as real-time, accurate, efficient.
Intelligent vehicle mounted terminal is as the part of intelligent transportation system, it is mounted on the vehicle, to various informations and the storage of vehicle, be connected with other equipment in the car by the CAN bus, have the mobile unit of GPS location, GPRS wireless data transmission function.Intelligent vehicle mounted terminal is to security, the very large effect of having improved service quality of management, personnel and the vehicle of standard driver's behavior, car operation company.
In order to make intelligent vehicle mounted terminal can carry out fast the input of information, the intelligent vehicle mounted terminal operated by rotary motion has card reader, need power supply during card reader work, the card reader of existing intelligent vehicle mounted terminal directly is connected with power supply, moment in power supply and card reader connection easily produces surge voltage, surge voltage easily makes the overtension that acts on card reader, thereby easily causes card reader to damage.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and the device of protection card reader in a kind of intelligent vehicle mounted terminal of the overtension of avoiding acting on card reader is provided.
The purpose of this utility model is achieved through the following technical solutions: the device of protection card reader in the intelligent vehicle mounted terminal; comprise power supply, low pressure difference linear voltage regulator and card reader; the input pin of described low pressure difference linear voltage regulator is connected with power supply; the output pin of low pressure difference linear voltage regulator is connected with card reader; the unsettled pin of described low pressure difference linear voltage regulator is connected with an electric capacity, and this electric capacity connects the other end ground connection of the unsettled pin end of low pressure difference linear voltage regulator relatively.
The ground pin ground connection of described low pressure difference linear voltage regulator, and be connected with power supply behind electric capacity of ground pin connection; Ground connection behind resistance of enable pin connection of described low pressure difference linear voltage regulator.When the utility model was worked, the enable pin of low pressure difference linear voltage regulator received the triggering level of intelligent vehicle mounted terminal output.
Be connected with an electric capacity on the connection line between described low pressure difference linear voltage regulator and the card reader, this electric capacity connects the other end ground connection of the connecting line terminal between low pressure difference linear voltage regulator and the card reader relatively.
The utility model compared with prior art has the following advantages and beneficial effect: be connected with low pressure difference linear voltage regulator between power supply of the present utility model and the Card Reader chip, low pressure difference linear voltage regulator can be to the voltage time-delay output of power supply output, avoid power supply and card reader and connect the surge voltage that moment occurs, thereby avoid surge voltage that card reader is caused damage; The utility model is connected with a direct earth capacitance by the unsettled pin of low pressure difference linear voltage regulator, and the grounding circuit that this electric capacity consists of consists of the holding circuit of low pressure difference linear voltage regulator, so can avoid low pressure difference linear voltage regulator to damage.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiment of the present utility model is not limited to this.
Embodiment:
As shown in Figure 1; the device of protection card reader in the intelligent vehicle mounted terminal; comprise power supply, low pressure difference linear voltage regulator and card reader; low pressure difference linear voltage regulator; be LDO; it comprises input limb VIN, output limb VOUT, enable pin EN, unsettled pin NC and ground connection limb GND, and the input pin of low pressure difference linear voltage regulator is connected with power supply, and the output pin of low pressure difference linear voltage regulator is connected with card reader.Be connected with an electric capacity on the connection line between low pressure difference linear voltage regulator and the card reader, this electric capacity is the second capacitor C 2, the two or two holds C2 one end and low pressure difference linear voltage regulator is connected with connection line between the card reader, its other end ground connection, the second capacitor C 2 are used for low pressure difference linear voltage regulator is carried out filtering to the output voltage of card reader.The ground pin ground connection of low pressure difference linear voltage regulator, and be connected with power supply behind electric capacity of ground pin connection, the electric capacity that ground pin connects is that the first capacitor C 1, the first capacitor C 1 is used for the voltage of power supply output is carried out buffered.The enable pin of low pressure difference linear voltage regulator connects ground connection behind the resistance, and this resistance is the first resistance R 1, the first resistance R 1 when being used for enable pin and receiving triggering level, and low pressure difference linear voltage regulator is protected.The unsettled pin of low pressure difference linear voltage regulator also is connected with an electric capacity, and this electric capacity is the other end ground connection that the 3rd capacitor C 3, the three capacitor C 3 connect the unsettled pin end of low pressure difference linear voltage regulator relatively.
This enforcement mesolow difference linear constant voltage regulator preferably adopts U7 XC6210B472MR, and card reader preferably adopts Card Reader chip MF RC500SO32, and when connecting, the output terminal of low pressure difference linear voltage regulator is connected with the power pin of Card Reader chip.When protecting the device work of card reader in the intelligent vehicle mounted terminal; the Enable Pin of low pressure difference linear voltage regulator receives triggering level; power supply is the card reader power supply; during supply voltage process low pressure difference linear voltage regulator; low pressure difference linear voltage regulator exports card reader to again to after inputting voltage in it and carrying out delay disposal.
As mentioned above, then can well realize the utility model.
Claims (3)
1. protect the device of card reader in the intelligent vehicle mounted terminal; it is characterized in that: comprise power supply, low pressure difference linear voltage regulator and card reader; the input pin of described low pressure difference linear voltage regulator is connected with power supply; the output pin of low pressure difference linear voltage regulator is connected with card reader; the unsettled pin of described low pressure difference linear voltage regulator is connected with an electric capacity, and this electric capacity connects the other end ground connection of the unsettled pin end of low pressure difference linear voltage regulator relatively.
2. protect the device of card reader in the intelligent vehicle mounted terminal according to claim 1, it is characterized in that: the ground pin ground connection of described low pressure difference linear voltage regulator, and be connected with power supply behind electric capacity of ground pin connection; Ground connection behind resistance of enable pin connection of described low pressure difference linear voltage regulator.
3. protect the device of card reader in the intelligent vehicle mounted terminal according to claim 1 and 2; it is characterized in that: be connected with an electric capacity on the connection line between described low pressure difference linear voltage regulator and the card reader, this electric capacity connects the other end ground connection of the connecting line terminal between low pressure difference linear voltage regulator and the card reader relatively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220369647 CN202662068U (en) | 2012-07-30 | 2012-07-30 | Device used to protect card reader in intelligent vehicle-mounted terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220369647 CN202662068U (en) | 2012-07-30 | 2012-07-30 | Device used to protect card reader in intelligent vehicle-mounted terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202662068U true CN202662068U (en) | 2013-01-09 |
Family
ID=47456957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220369647 Expired - Fee Related CN202662068U (en) | 2012-07-30 | 2012-07-30 | Device used to protect card reader in intelligent vehicle-mounted terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202662068U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103049939A (en) * | 2011-10-15 | 2013-04-17 | 成都锐奕信息技术有限公司 | Device for protecting card reader in intelligent vehicle-mounted terminal |
-
2012
- 2012-07-30 CN CN 201220369647 patent/CN202662068U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103049939A (en) * | 2011-10-15 | 2013-04-17 | 成都锐奕信息技术有限公司 | Device for protecting card reader in intelligent vehicle-mounted terminal |
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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 |
Granted publication date: 20130109 Termination date: 20150730 |
|
| EXPY | Termination of patent right or utility model |