CN204576326U - A kind of USB data line driving circuit with multimedia deixis - Google Patents
A kind of USB data line driving circuit with multimedia deixis Download PDFInfo
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- CN204576326U CN204576326U CN201520081733.2U CN201520081733U CN204576326U CN 204576326 U CN204576326 U CN 204576326U CN 201520081733 U CN201520081733 U CN 201520081733U CN 204576326 U CN204576326 U CN 204576326U
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Abstract
The utility model provides a kind of USB data line driving circuit with multimedia deixis, it provides a kind of USB data line driving circuit with voice message and LED flash for prompting function, comprise current detection circuit, voltage conversion circuit, comparator circuit, reference voltage circuit, described current detection circuit one end connects USB positive electricity end, the other end connects voltage conversion circuit, voltage conversion circuit connects the out-phase input end of comparator circuit, reference voltage unit one end connects USB positive electricity end, the other end connects comparator circuit in-phase input end, comparator circuit output terminal is connected with driving circuit, driving circuit is connected with Music Clip and LED.
Description
Technical field
The utility model relates to electronic technology field, provides a kind of USB data line driving circuit with multimedia deixis.
Background technology
Along with the development of society and the progress of science and technology, developing rapidly and vigorously of electronic technology makes the renewal of electronic product day by day accelerate, trend towards complete function gradually, outward appearance is unique, easy to use, follow the fashion and practicality, individual requirement experiences the future developments such as innovation, thus each electronic product is as mobile phone, Pad, laptop computer, cameras etc. have become requisite part in people's daily life, become people to live a closely bound up part, and electronic product multiaspect faces the problem of a charging, then existing charging equipment in use, the whether charging complete of product cannot be recognized in using, user needs to check charge condition by the screen or switch of opening electronic product, very inconvenient, traditional charging structure also adopts the bright of LED etc. secretly to realize charging display and prompting function, this mode is not easy the attention causing user, thus cause and overcharge, overcharge also can cause certain bad impact to the serviceable life of battery.
Summary of the invention
The object of the present invention is to provide a kind of USB data line driving circuit with sound prompt function, it realizes multimedia deixis by built-in buzzer and music module, and user uses very convenient.
The utility model is by the following technical solutions to achieve these goals:
A kind of USB data line driving circuit with multimedia deixis, it is characterized in that: comprise current detection circuit, voltage conversion circuit, comparator circuit, reference voltage circuit, described current detection circuit one end connection USB positive electricity end, the other end connects voltage conversion circuit, voltage conversion circuit connects the out-phase input end of comparator circuit, reference voltage unit one end connects USB positive electricity end, the other end connects comparator circuit in-phase input end, comparator circuit output terminal is connected with driving circuit, and driving circuit is connected with Music Clip and LED.
In technique scheme, described current detection circuit comprises resistance R4-R6, operational amplifier, the out-phase input end of operational amplifier connects USB positive electricity end by resistance R5, and the in-phase input end of operational amplifier connects USB positive electricity end by resistance R4, the resistance R6 of series connection.
In technique scheme, described voltage conversion circuit comprises field effect transistor Q1, the grid of resistance R7, field effect transistor Q1 connects operational amplifier output terminal, drain electrode concatenation operation amplifier in-phase input end, source electrode contact resistance R7, resistance R7 other end ground connection.
In technique scheme, reference voltage circuit comprises operational amplifier OP, resistance R1-R3, number of parallel is PNP pipe Q1 and the PNP pipe group Q4 of 1:N, resistance R1 is connected between the out-phase input end of operational amplifier OP and output terminal, between the in-phase input end that resistance R2 is connected to operational amplifier OP and output terminal, the in-phase input end of resistance R3 concatenation operation amplifier OP and the emitter of PNP pipe group Q4, the emitter of triode Q3 connects the out-phase input end of operational amplifier OP.
In technique scheme, described comparator circuit comprises comparer, and the in-phase input end of comparer connects, the link of comparer out-phase input end contact resistance R7 and field effect transistor Q1 source electrode, and output terminal connects driving circuit.
In technique scheme, described driving circuit comprises field effect transistor Q5, field effect transistor Q2, and the grid of field effect transistor Q5, field effect transistor Q2 all connects the output terminal of comparer, and field effect transistor Q2 is as the driving of music module, and field effect transistor Q5 is as the driving of LED.
Because the utility model adopts technique scheme, therefore possess following beneficial effect:
The utility model comprises small-sized hummer, music module, keyswitch and LED lamp bead.When USB connects with the mains, LED conducting is luminous, detects in real time equally to the VDD-to-VSS in USB data line, exports a feedback enable signal when charging is complete and triggers music module and send musical sound by hummer.Keyswitch in series via is integrated on PCB, and USB data line joint adopts flexible plastic parcel herein, and after pressing switch, hummer is turned off, and music stops.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
Fig. 2 is circuit structure block diagram of the present utility model.
Embodiment
Principle of work illustrates: in Fig. 1, OP is operational amplifier, the PNP pipe of Q3, Q4 to be number of parallel be 1:N.Because amplifier two ends VP, VN voltage is equal, i.e. VP=VN, and the number of parallel of PNP pipe is generally 1:8 than for 1:N(uses in circuit design), the Vbe of Q3 and Q4 is formed voltage difference that a value is △ Vbe, in conjunction with amplifier characteristic, can determine that the voltage difference at resistance R3 two ends is exactly △ Vbe, this is the voltage of a positive temperature coefficient (PTC).The electric current flowing through resistance R3 is △ Vbe/R3, so just can calculate the voltage of Vout: Vout=Vbe2+ (△ Vbe/R3) * (R3+R2)
Due to the voltage that Vbe2 is negative temperature coefficient, therefore, the voltage superposition of positive and negative two temperatures coefficient, just can design the voltage of a zero-temperature coefficient.Vout is exported as reference voltage.
In Fig. 1, R4 detects resistance, and flowing through electric current is IL, because amplifier input both end voltage is equal, therefore has VP1=VN1, and suppose that D+ in terminal voltage be VDP, D+ out terminal voltage is VDN, resistance R6=R5, then have:
VDN=VDP+IL*R4
VP=VDN+Io*R5
VDN=VN1
Io=(VDN-VP)/R6
Can be calculated by above 4 formulas: Vsense=Io*20R5=20*IL*R5
That is, for given resistance R4, output voltage directly reflects the size flowing through the electric current detecting resistance.
Reference voltage Vout compares rear drive with detection voltage Vsense through comparer and drives field effect transistor Q2 and Q5, thus driving LED lamp and music module work.
Claims (6)
1. the USB data line driving circuit with multimedia deixis, it is characterized in that: comprise current detection circuit, voltage conversion circuit, comparator circuit, reference voltage circuit, described current detection circuit one end connection USB positive electricity end, the other end connects voltage conversion circuit, voltage conversion circuit connects the out-phase input end of comparator circuit, reference voltage unit one end connects USB positive electricity end, the other end connects comparator circuit in-phase input end, comparator circuit output terminal is connected with driving circuit, and driving circuit is connected with Music Clip and LED.
2. a kind of USB data line driving circuit with multimedia deixis according to claim 1, it is characterized in that: described current detection circuit comprises resistance R4-R6, operational amplifier, the out-phase input end of operational amplifier connects USB positive electricity end by resistance R5, and the in-phase input end of operational amplifier connects USB positive electricity end by resistance R4, the resistance R6 of series connection.
3. a kind of USB data line driving circuit with multimedia deixis according to claim 2, it is characterized in that: described voltage conversion circuit comprises field effect transistor Q1, resistance R7, the grid of field effect transistor Q1 connects operational amplifier output terminal, drain electrode concatenation operation amplifier in-phase input end, source electrode contact resistance R7, resistance R7 other end ground connection.
4. a kind of USB data line driving circuit with multimedia deixis according to claim 1, it is characterized in that: reference voltage circuit comprises operational amplifier OP, resistance R1-R3, number of parallel is PNP pipe Q1 and the PNP pipe group Q4 of 1:N, resistance R1 is connected between the out-phase input end of operational amplifier OP and output terminal, between the in-phase input end that resistance R2 is connected to operational amplifier OP and output terminal, the in-phase input end of resistance R3 concatenation operation amplifier OP and the emitter of PNP pipe group Q4, the emitter of triode Q3 connects the out-phase input end of operational amplifier OP.
5. according to the arbitrary described a kind of USB data line driving circuit with multimedia deixis of claim 1-4, it is characterized in that: described comparator circuit comprises comparer, the in-phase input end of comparer connects, the link of comparer out-phase input end contact resistance R7 and field effect transistor Q1 source electrode, output terminal connects driving circuit.
6. a kind of USB data line driving circuit with multimedia deixis according to claim 5, it is characterized in that: described driving circuit comprises field effect transistor Q5, field effect transistor Q2, the grid of field effect transistor Q5, field effect transistor Q2 all connects the output terminal of comparer, field effect transistor Q2 is as the driving of music module, and field effect transistor Q5 is as the driving of LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520081733.2U CN204576326U (en) | 2015-02-05 | 2015-02-05 | A kind of USB data line driving circuit with multimedia deixis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520081733.2U CN204576326U (en) | 2015-02-05 | 2015-02-05 | A kind of USB data line driving circuit with multimedia deixis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204576326U true CN204576326U (en) | 2015-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520081733.2U Expired - Fee Related CN204576326U (en) | 2015-02-05 | 2015-02-05 | A kind of USB data line driving circuit with multimedia deixis |
Country Status (1)
| Country | Link |
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| CN (1) | CN204576326U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633754A (en) * | 2015-12-26 | 2016-06-01 | 北海市永达鑫电子有限公司 | Data line |
-
2015
- 2015-02-05 CN CN201520081733.2U patent/CN204576326U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633754A (en) * | 2015-12-26 | 2016-06-01 | 北海市永达鑫电子有限公司 | Data line |
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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: 20150819 Termination date: 20170205 |