CN201805223U - Communication terminal capable of reducing transient current - Google Patents
Communication terminal capable of reducing transient current Download PDFInfo
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- CN201805223U CN201805223U CN2010205259132U CN201020525913U CN201805223U CN 201805223 U CN201805223 U CN 201805223U CN 2010205259132 U CN2010205259132 U CN 2010205259132U CN 201020525913 U CN201020525913 U CN 201020525913U CN 201805223 U CN201805223 U CN 201805223U
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- communication terminal
- pin
- capacitor
- power supply
- usb
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Abstract
The utility model discloses a communication terminal capable of reducing transient current, which comprises a universal serial bus (USB) interface and a first capacitor. The communication terminal is characterized by further comprising a charging unit and a switch tube. A power supply pin of the USB interface is connected with the first capacitor by a first resistor, an input end of the charging unit is connected with the power supply pin of the USB interface, a first output end of the charging unit is connected with a first pin of the switch tube, a second output end of the charging unit is grounded, a second pin of the switch tube is connected with the first resistor, and a third pin of the switch tube is connected with a positive pole of the first capacitor. The communication terminal adopts the charging unit connected into a circuit of the communication terminal, delayed conduction of the switch tube in the circuit is realized by the aid of a time constant of the charging unit, the transient current loaded by the capacitor in charging is reduced to be lower than 500mA, and a USB power supply device is effectively protected so that the USB power supply device can operate safely and reliably.
Description
Technical field
The utility model relates to communication technical field, particularly a kind of communication terminal that can reduce immediate current.
Background technology
Because wireless data card is supported EDGE (Enhanced Data Rate for GSM Evolution, the enhanced data rates for gsm evolution technology) and GPRS (General Packet Radio Service, the general packet radio service technology) technology, the moment that the communication products such as wireless data card of threshold currents power supply are powering up, immediate current can be very big when high-power emission, need big electric capacity to come filtering, and the capacity of this big electric capacity is generally about 1000uF.
If communication terminal adopts USB (Universal Serial BUS, USB) power supply, owing in circuit, adopted big electric capacity, when wireless data card begins to power up, big capacitive load has a very big electric current powering up moment, this big electric current can directly influence the safety (electric current is limited in below the 500mA when powering because of USB) of power supply unit, even can damage power supply unit.
Thereby prior art is still waiting to improve and improve.
The utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of communication terminal that can reduce immediate current, can reduce the immediate current of capacitive load when powering up, thereby protects power supply unit effectively.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of communication terminal that can reduce immediate current, it comprises the USB interface and first electric capacity, wherein, also comprises charhing unit and switching tube; The power pin of described USB interface is connected with described first electric capacity by first resistance, and the input of described charhing unit connects the power pin of USB interface, and first output of charhing unit connects first pin of described switching tube, second output head grounding; Second pin of described switching tube is connected with described first resistance, and three-prong connects the positive pole of described first electric capacity.
The described communication terminal that can reduce immediate current, wherein, described charhing unit comprises second electric capacity and second resistance of series connection.
The described communication terminal that can reduce immediate current, wherein, described switching tube is a metal-oxide-semiconductor.
The described communication terminal that can reduce immediate current, wherein, the described communication terminal that can reduce immediate current is a wireless data card.
The communication terminal that can reduce immediate current that the utility model provides; adopted in the circuit of communication terminal and inserted charhing unit; utilize the charhing unit time constant to make switching tube time-delay conducting in the circuit; capacitive load is dropped to below the 500mA at the electric current that powers up moment; protected power supply unit effectively, made the safe and reliable work of power supply unit.
Description of drawings
The circuit block diagram of the communication terminal that can reduce immediate current that Fig. 1 provides for the utility model embodiment;
The circuit theory diagrams of the communication terminal that can reduce immediate current that Fig. 2 provides for the utility model embodiment.
Embodiment
The utility model provides a kind of communication terminal that can reduce immediate current, utilize little electric current to give big electric capacity charging, and when big electric capacity was full of electricity, the communication terminal normal boot-strap becomes large current charge like this and is low current charge, played the effect of protection power supply unit.
For making the purpose of this utility model, technical scheme and effect clearer, clear and definite, below with reference to accompanying drawing and give an actual example the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The communication terminal that the utility model embodiment provides is a wireless data card, mainly large current charge is become little circuit charging, plays the effect of protection power supply unit.See also Fig. 1 and Fig. 2, described communication terminal comprises USB interface J1, first capacitor C 1, first resistance R 1, switching tube 110 and charhing unit 120.
First pin of described USB interface J1 is a power pin, be used for when communication terminal inserts the USB power supply, give this communication terminal power supply, second pin and the three-prong of described USB interface J1 are the data wire pin, be used to connect data wire, the 4th pin is a ground pin.
Wherein, the power pin of described USB interface J1 (i.e. first pin) is by the positive pole of described first resistance R, 1 connection, first capacitor C 1, the minus earth of described first capacitor C 1.The capacity of described first capacitor C 1 is a large capacitive load about 1000uF, mainly strobes in the circuit of communication terminal.
Herein, described first resistance R 1 is a charging resistor, when the communication terminal energized, give this first capacitor C, 1 charging, and the big I of charging current is controlled by the resistance of regulating this first resistance R 1.
The input of described charhing unit 120 is connected with the power pin of described USB interface J1, and first output of charhing unit 120 connects first pin of described switching tube 110, second output head grounding.Second pin of described switching tube 110 is connected with the input of described first resistance R 1, and three-prong connects the positive pole of described first capacitor C 1.When described first electric capacity charged, this charhing unit 120 began charging, thereby can reduce the charging current on first capacitor C 1.
In the present embodiment, described charhing unit 120 comprises second resistance R 2 and second capacitor C 2, and described second capacitor C 2 is connected with second resistance R 2, and by these second resistance R, 2 ground connection.Described switching tube 110 is metal-oxide-semiconductor M1 (metal oxid semiconductor, a field-effect transistor).
In the circuit of this communication terminal, described metal-oxide-semiconductor M1 mainly plays on-off action, and the grid of metal-oxide-semiconductor M1 is connected with the negative pole of described second capacitor C 2, and source electrode connects the input of described first resistance R 1, and drain electrode connects the positive pole of first capacitor C 1.
Should be noted that metal-oxide-semiconductor M1 herein can also substitute with triode, increase gradually, when making that triode is saturated to be in saturation condition, just can make the triode conducting at the electric current of charhing unit 120 outputs.
Below can reduce the communication terminal of immediate current to the utility model operation principle be described in detail:
When the communication terminal energized, described metal-oxide-semiconductor M1 is in off-state, and this moment first, capacitor C 1 was by 1 charging of first resistance R.The computing formula of its charging current is:
I＝(V1-V2)/R1
Wherein, V1 is the USB output voltage of power supply unit, and be generally+5V, V2 is the magnitude of voltage of first capacitor C, 1 positive pole, from above-mentioned formula as can be seen, the charging current of first capacitor C 1 can reduce along with the increase of first capacitor C, 1 voltage, and when the voltage of first capacitor C 1 approached the supply power voltage of USB, its charging current approached zero.
In 1 charging of first capacitor C, the voltage V3 of metal-oxide-semiconductor M1 grid can pass through charhing unit 120 (i.e. second resistance R 2 and second capacitor C 2) charging and reduce gradually, when the voltage V3 of metal-oxide-semiconductor M1 grid drops to its threshold value or is lower than its threshold value, metal-oxide-semiconductor M1 conducting.Can make the branch, short-circuit of first resistance R 1 after the metal-oxide-semiconductor M1 conducting, thereby the USB power supply is connected with first capacitor C 1 by metal-oxide-semiconductor, because this moment, first capacitor C 1 was full of in advance, after the metal-oxide-semiconductor M1 conducting, therefore the USB power supply is almost nil to the charging current of first capacitor C 1, has eliminated the big electric current that first capacitor C 1 powers up moment fully.
When described communication terminal is connected the USB power supply, by the charhing unit 120 charging metal-oxide-semiconductor M1 conducting of delaying time, and the time of time-delay is determined that by the value of second resistance R 2 and second capacitor C 2 big more its time-delay of the value of second resistance R 2 and second capacitor C 2 is long more, and the conducting of metal-oxide-semiconductor M1 is slow more.
In sum; the communication terminal that can reduce immediate current that the utility model provides; adopted in the circuit of communication terminal and inserted charhing unit; utilize the charhing unit time constant to make switching tube time-delay conducting in the circuit; capacitive load is dropped to below the 500mA at the electric current that powers up moment; protected the USB power supply unit effectively, made the safe and reliable work of USB power supply unit.
Be understandable that; for those of ordinary skills; can be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the utility model.
Claims (4)
1. communication terminal that can reduce immediate current, it comprises the USB interface and first electric capacity, it is characterized in that, also comprises charhing unit and switching tube; The power pin of described USB interface is connected with described first electric capacity by first resistance, and the input of described charhing unit connects the power pin of USB interface, and first output of charhing unit connects first pin of described switching tube, second output head grounding; Second pin of described switching tube is connected with described first resistance, and three-prong connects the positive pole of described first electric capacity.
2. the communication terminal that can reduce immediate current according to claim 1 is characterized in that, described charhing unit comprises second electric capacity and second resistance of series connection.
3. the communication terminal that can reduce immediate current according to claim 1 is characterized in that, described switching tube is a metal-oxide-semiconductor.
4. the communication terminal that can reduce immediate current according to claim 1 is characterized in that, the described communication terminal that can reduce immediate current is a wireless data card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205259132U CN201805223U (en) | 2010-09-09 | 2010-09-09 | Communication terminal capable of reducing transient current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205259132U CN201805223U (en) | 2010-09-09 | 2010-09-09 | Communication terminal capable of reducing transient current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201805223U true CN201805223U (en) | 2011-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205259132U Expired - Fee Related CN201805223U (en) | 2010-09-09 | 2010-09-09 | Communication terminal capable of reducing transient current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201805223U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969192A (en) * | 2010-09-09 | 2011-02-09 | 惠州Tcl移动通信有限公司 | Communication terminal for protecting universal serial bus (USB) power supply equipment |
| CN104201748A (en) * | 2014-09-28 | 2014-12-10 | 深圳市伊爱高新技术开发有限公司 | Intelligent charging circuit |
| CN104252214A (en) * | 2013-06-26 | 2014-12-31 | 深圳富泰宏精密工业有限公司 | Portable electronic device |
| EP3016471A4 (en) * | 2013-06-26 | 2017-03-15 | Huizhou TCL Mobile Communication Co., Ltd. | Communication module and corresponding portable terminal |
| CN107104422A (en) * | 2016-02-23 | 2017-08-29 | 朱隆娅 | It is a kind of to reduce the communication terminal of immediate current |
-
2010
- 2010-09-09 CN CN2010205259132U patent/CN201805223U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969192A (en) * | 2010-09-09 | 2011-02-09 | 惠州Tcl移动通信有限公司 | Communication terminal for protecting universal serial bus (USB) power supply equipment |
| CN104252214A (en) * | 2013-06-26 | 2014-12-31 | 深圳富泰宏精密工业有限公司 | Portable electronic device |
| EP3016471A4 (en) * | 2013-06-26 | 2017-03-15 | Huizhou TCL Mobile Communication Co., Ltd. | Communication module and corresponding portable terminal |
| CN104252214B (en) * | 2013-06-26 | 2019-02-26 | 深圳富泰宏精密工业有限公司 | Portable electronic device |
| CN104201748A (en) * | 2014-09-28 | 2014-12-10 | 深圳市伊爱高新技术开发有限公司 | Intelligent charging circuit |
| CN107104422A (en) * | 2016-02-23 | 2017-08-29 | 朱隆娅 | It is a kind of to reduce the communication terminal of immediate current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20130909 |