CN104701933A - OTG selective charging circuit and portable loudspeaker box - Google Patents
OTG selective charging circuit and portable loudspeaker box Download PDFInfo
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- CN104701933A CN104701933A CN201510066850.6A CN201510066850A CN104701933A CN 104701933 A CN104701933 A CN 104701933A CN 201510066850 A CN201510066850 A CN 201510066850A CN 104701933 A CN104701933 A CN 104701933A
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Abstract
The invention is applicable to the field of electrons and provides an OTG selective charging circuit and a portable loudspeaker box. The OTG selective charging circuit comprises an input voltage detection unit for judging whether input voltage reaches a preset threshold value or not, generating a locking charge signal when the input voltage does not reach the preset threshold value and generating a charge control signal when the input voltage reaches the preset threshold value, a charge switching unit, and a charge unit for controlling battery charge according to charge voltage/current, wherein the charge switching unit is turned off according to the locking charge signal when clamped voltage is not received, or the charge switching unit is turned on and charge voltage/current is output according to the charge control signal, and the charge switching unit is turned off when the clamped voltage is received. When the portable loudspeaker box uses an OTG line to transmit a sound source for playing, an OTG machine is prevented from mistakenly charging batteries by detecting input voltage, normal charge can be performed when the OTG machine is connected with a PC or a charger, and the phenomenon that the OTG machine repeatedly charges and discharges the batteries and accordingly the service life of the batteries is shortened is effectively avoided.
Description
Technical field
The invention belongs to electronic applications, particularly relate to a kind of OTG selective charge circuit and portable audio.
Background technology
Along with the development of USB technology, make PC and peripheral equipment can lead to mode, appropriateness manufacturing cost by together with the equipment connection of various data transmission bauds.But, the connection realizing between various different equipment or mobile device by OTG (On-The-Go) is just needed under the control departing from PC, carry out exchanges data, but for the Portable sound such as headphone and music box system, use IPHONE OTG or Android OTG through OTG line transmission source of sound play time, OTG machine easily to the charging by mistake of the battery in the Portable sound such as headphone and music box system, and then causes battery repeated charge and causes the lost of life.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of OTG selective charge circuit, is intended to solve existing OTG machine easily to battery charging by mistake, and then causes the problem of shorter battery life.
The embodiment of the present invention is achieved in that a kind of OTG selective charge circuit, and its input is connected with OTC data terminal or PC, and its output is connected with battery, and described circuit comprises:
Input voltage measurement unit, for judging whether input voltage reaches predetermined threshold value, locking charging signals is generated when described input voltage does not reach predetermined threshold value, generate charging control signal when described input voltage reaches predetermined threshold value, the input of described input voltage measurement unit is the input of described OTG selective charge circuit;
Charging switching element, voltage is determined for detecting pincers, described charging switching element is turned off not receiving when voltage determined by described pincers according to described locking charging signals, or open described charging switching element according to described charging control signal and export charging voltage/electric current, determine voltage according to described pincers when voltage determined by described pincers and turn off described charging switching element receiving, the input of described charging switching element is connected with the input of described input voltage measurement unit, the control end of described charging switching element is that the pincers of described OTG selective charge circuit are determined voltage receiving terminal and are also connected with the output of described input voltage measurement unit,
Charhing unit, for charging according to described charging voltage/Current Control battery, the input of described charhing unit is connected with the output of described charging switching element, and the output of described charhing unit is the output of described OTG selective charge circuit.
Another object of the embodiment of the present invention is, provides a kind of portable audio adopting above-mentioned OTG selective charge circuit.
The OTG selective charge circuit that the embodiment of the present invention provides and Portable sound system are when using the playing through OTG line transmission source of sound of Iphone OTG, Android OTG, prevent OTG machine to battery charging by mistake by detecting input voltage, and can charge normal when connecting with PC or charger, effectively prevent OTG machine and shorter battery life is caused to battery repeated charge, OTG electromechanics amount is kept not misapplied, this circuit is economical and practical, simple for production.
Accompanying drawing explanation
The structure chart of the OTG selective charge circuit that Fig. 1 provides for the embodiment of the present invention;
The exemplary circuit structure chart of the OTG selective charge circuit that Fig. 2 provides for the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
The Portable sound system that the embodiment of the present invention provides use Iphone OTG, Android OTG through OTG line transmission source of sound play time, prevent OTG machine to battery charging by mistake by detecting input voltage, and can charge normal when connecting with PC or charger, effectively prevent OTG machine and shorter battery life is caused to battery repeated charge.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Fig. 1 shows the structure of the OTG selective charge circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this OTG selective charge circuit can be applied in any portable audio, such as headphone and music box, the input of this OTG selective charge circuit 1 is connected with OTC data terminal or PC, its output is connected with battery 2, and this OTG selective charge circuit 1 comprises:
Input voltage measurement unit 11, for judging whether input voltage reaches predetermined threshold value, locking charging signals is generated when input voltage does not reach predetermined threshold value, generate charging control signal when input voltage reaches predetermined threshold value, the input of input voltage measurement unit 11 is the input of OTG selective charge circuit 1;
Charging switching element 12, voltage is determined for detecting pincers, charging switching element 12 is turned off according to locking charging signals when not receiving and clamping and determine voltage, or open charging switching element 12 according to charging control signal and export charging voltage/electric current, determine voltage when receiving and clamping and determine voltage according to pincers and turn off charging switching element 12, the input of charging switching element 12 is connected with the input of input voltage measurement unit 11, and the control end of charging switching element 12 is that the pincers of OTG selective charge circuit 1 are determined voltage receiving terminal and are also connected with the output of input voltage measurement unit 11;
Charhing unit 13, for charging according to charging voltage/Current Control battery, the input of charhing unit 13 is connected with the output of charging switching element 12, and the output of charhing unit 13 is the output of OTG selective charge circuit 1.
In embodiments of the present invention, when accessing Iphone OTG, due to Iphone OTG output is+4.2V voltage, lower than predetermined threshold value, and therefore charging switching element 12 not conducting, OTG selective charge circuit 1 does not charge to battery 2;
When accessing PC USB, due to PC USB output is+5V voltage, higher than predetermined threshold value, and charging switching element 12 conducting, OTG selective charge circuit 1 pair of battery 2 charges;
When accessing Android OTG, although Android OTG exports+5V voltage, higher than predetermined threshold value, Android OTG can send low level pincers when accessing simultaneously and determine voltage, thus controlling charging switching element 12 not conducting, OTG selective charge circuit 1 does not charge to battery 2.
The OTG selective charge circuit that the embodiment of the present invention provides and Portable sound system are when using the playing through OTG line transmission source of sound of Iphone OTG, Android OTG, prevent OTG machine to battery charging by mistake by detecting input voltage, and can charge normal when connecting with PC or charger, effectively prevent OTG machine and shorter battery life is caused to battery repeated charge, OTG electromechanics amount is kept not misapplied, this circuit is economical and practical, simple for production.
Fig. 2 shows the exemplary circuit structure of the OTG selective charge circuit that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention.
As one embodiment of the invention, this input voltage measurement unit 11 comprises:
Resistance R2, resistance R3, resistance R5, second switch pipe Q2 and the 4th switching tube Q4;
One end of resistance R2 is that the input of input voltage measurement unit 11 is connected with one end of resistance R5, the other end of resistance R2 is by resistance R3 ground connection, the other end of resistance R2 is also connected with the control end of second switch pipe Q2, the input of second switch pipe Q2 is connected with the other end of resistance R5, the output head grounding of second switch pipe Q2, the input of second switch pipe Q2 is also connected with the control end of the 4th switching tube Q4, the input of the 4th switching tube Q4 is the output of input voltage measurement unit 11, the output head grounding of the 4th switching tube Q4.
As one embodiment of the present invention, second switch pipe Q2 and the 4th switching tube Q4 all can adopt NPN type triode, the base stage of NPN type triode is the control end of second switch pipe Q2 or the 4th switching tube Q4, the input of the current collection of NPN type triode very second switch pipe Q2 or the 4th switching tube Q4, the output of the transmitting of NPN type triode very second switch pipe Q2 or the 4th switching tube Q4.
As one embodiment of the invention, charging switching element 12 comprises:
Resistance R4, resistance R8, resistance R9, the first switching tube Q1 and the 3rd switching tube Q3;
The input of the 3rd switching tube Q3 is connected with one end of resistance R9, one end of resistance R4 while of being the input of charging switching element 12, the output of the 3rd switching tube Q3 is the output of charging switching element 12, the control end of the 3rd switching tube Q3 is connected with the other end of resistance R4, the input of the first switching tube Q1 simultaneously, the other end of resistance R9 is connected with the control end of the first switching tube Q1, one end of resistance R8 simultaneously, the output head grounding of the first switching tube Q1, the other end of resistance R8 is the control end of charging switching element 12.
As one embodiment of the present invention, first switching tube Q1 can adopt NPN type triode, the base stage of NPN type triode is the control end of the first switching tube Q1, the input of the current collection of NPN type triode very the first switching tube Q1, the output of the transmitting of NPN type triode very the first switching tube Q1;
3rd switching tube Q3 can adopt P type metal-oxide-semiconductor, and the source electrode of P type metal-oxide-semiconductor is the input of the 3rd switching tube Q3, and the drain electrode of P type metal-oxide-semiconductor is the output of the 3rd switching tube Q3, and the grid of P type metal-oxide-semiconductor is the control end of the 3rd switching tube Q3.
As one embodiment of the invention, charhing unit 13 comprises:
Resistance R1, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, LED 2 and charging management chip IC1;
The input that the power end (VCC) of charging management chip IC1 is charhing unit 13 simultaneously with one end of electric capacity C1, one end of resistance R1 connects, the other end ground connection of electric capacity C1, the other end of resistance R1 is connected with the anode of LED 2, the negative electrode of LED 2 is connected with the charged state indication end (CH) of charging management chip IC1, the constant current charge electric current of charging management chip IC1 arranges end (PG) by resistance R7 ground connection, the earth terminal ground connection of charging management chip IC1, the output that the battery-end (BAT) of charging management chip IC1 is charhing unit 13 simultaneously with electric capacity C2, one end of electric capacity C3 connects, electric capacity C2, the other end ground connection simultaneously of electric capacity C3.
As one embodiment of the invention, OTG selective charge circuit 1 can also comprise:
Interface unit 14 and resistance R6;
Interface unit 14 is as the input of OTG selective charge circuit 1, first port (PIN1) of interface unit 14 is connected with one end of resistance R6, the other end of resistance R6 is connected with the input of input voltage measurement unit 11, and the pincers that the 4th port (PIN4) of interface unit 14 is OTG selective charge circuit 1 are determined voltage receiving terminal and are connected with the control end of charging switching element 12.
Preferably, interface unit 14 can adopt MICRO USB socket.
In embodiments of the present invention, this OTG selective charge circuit can initiatively detect input voltage, according to the attribute of input voltage identification external connection apparatus and according to the charging of its Attributions selection, its course of work is as follows:
Because Iphone OTG output is+4.2V, the base stage of triode Q2 can not get the 0.5-0.7V voltage needed for conducting after resistance R3 dividing potential drop, therefore triode Q2 not conducting, triode Q4 conducting, low level determined by CHECK point pincers, and triode Q1 base stage is low level, and triode Q1 ends, therefore metal-oxide-semiconductor Q3 not conducting ,+4.2V voltage cannot be charged to battery 2 by metal-oxide-semiconductor Q3;
When accessing PC USB, due to PC USB output is+5V voltage, the base stage of triode Q2 still can obtain the 0.5V voltage needed for conducting after resistance R3 dividing potential drop, the current potential of triode Q4 base stage is dragged down after triode Q2 conducting, triode Q4 ends, triode Q1 conducting drags down the current potential of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 conducting, and+5V voltage is charged to battery 2 by metal-oxide-semiconductor Q3;
When accessing Android OTG, because Android OTG exports+5V voltage, and the 4th port PIN4 of MICRO USB socket obtains low level, CHECK point pincers are due to low level, the base stage low level of triode Q1, triode Q1 ends, triode Q3 not conducting, and+4.2V voltage cannot be charged to battery 2 by metal-oxide-semiconductor Q3.
As one embodiment of the invention, this OTG selective charge circuit 1 can also comprise:
First magnetic bead FB1, the second magnetic bead FB2 and the 3rd magnetic bead FB3;
One end of first magnetic bead FB1 is connected with second port (PIN2) of interface unit 14, and the other end of the first magnetic bead FB1 is connected with a digital audio differential input end (DM);
One end of second magnetic bead FB2 is connected (PIN3) with the 3rd port of interface unit 14, and the other end of the second magnetic bead FB2 is connected with another digital audio differential input end (DP);
One end of 3rd magnetic bead FB3 is connected (PIN5) with the five-port of interface unit 14, the other end ground connection of the 3rd magnetic bead FB3.
In embodiments of the present invention, ultra-high frequency signal can be absorbed by serial connection magnetic bead, thus suppress the high-frequency noise on digital audio differential input signal line and spike interference.
Another object of the embodiment of the present invention is, provides a kind of portable audio adopting above-mentioned OTG selective charge circuit.
The OTG selective charge circuit that the embodiment of the present invention provides and Portable sound system are when using the playing through OTG line transmission source of sound of Iphone OTG, Android OTG, prevent OTG machine to battery charging by mistake by detecting input voltage, and can charge normal when connecting with PC or charger, effectively prevent OTG machine and shorter battery life is caused to battery repeated charge, OTG electromechanics amount is kept not misapplied, this circuit is economical and practical, simple for production.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an OTG selective charge circuit, its input is connected with OTC data terminal or PC, and its output is connected with battery, it is characterized in that, described circuit comprises:
Input voltage measurement unit, for judging whether input voltage reaches predetermined threshold value, locking charging signals is generated when described input voltage does not reach predetermined threshold value, generate charging control signal when described input voltage reaches predetermined threshold value, the input of described input voltage measurement unit is the input of described OTG selective charge circuit;
Charging switching element, voltage is determined for detecting pincers, described charging switching element is turned off not receiving when voltage determined by described pincers according to described locking charging signals, or open described charging switching element according to described charging control signal and export charging voltage/electric current, determine voltage according to described pincers when voltage determined by described pincers and turn off described charging switching element receiving, the input of described charging switching element is connected with the input of described input voltage measurement unit, the control end of described charging switching element is that the pincers of described OTG selective charge circuit are determined voltage receiving terminal and are also connected with the output of described input voltage measurement unit,
Charhing unit, for charging according to described charging voltage/Current Control battery, the input of described charhing unit is connected with the output of described charging switching element, and the output of described charhing unit is the output of described OTG selective charge circuit.
2. circuit as claimed in claim 1, it is characterized in that, described input voltage measurement unit comprises:
Resistance R2, resistance R3, resistance R5, second switch pipe and the 4th switching tube;
One end of described resistance R2 is that the input of described input voltage measurement unit is connected with one end of described resistance R5, the other end of described resistance R2 is by described resistance R3 ground connection, the other end of described resistance R2 is also connected with the control end of described second switch pipe, the input of described second switch pipe is connected with the other end of described resistance R5, the output head grounding of described second switch pipe, the input of described second switch pipe is also connected with the control end of described 4th switching tube, the input of described 4th switching tube is the output of described input voltage measurement unit, the output head grounding of described 4th switching tube.
3. circuit as claimed in claim 2, it is characterized in that, described second switch pipe and described 4th switching tube are NPN type triode, the base stage of described NPN type triode is the control end of described second switch pipe or described 4th switching tube, the very described second switch pipe of current collection of described NPN type triode or the input of described 4th switching tube, the very described second switch pipe of transmitting of described NPN type triode or the output of described 4th switching tube.
4. circuit as claimed in claim 1, it is characterized in that, described charging switching element comprises:
Resistance R4, resistance R8, resistance R9, the first switching tube and the 3rd switching tube;
With one end of described resistance R9 while that the input of described 3rd switching tube being the input of described charging switching element, one end of described resistance R4 connects, the output of described 3rd switching tube is the output of described charging switching element, the control end of described 3rd switching tube simultaneously with the other end of described resistance R4, the input of described first switching tube connects, the other end of described resistance R9 simultaneously with the control end of described first switching tube, one end of described resistance R8 connects, the output head grounding of described first switching tube, the other end of described resistance R8 is the control end of described charging switching element.
5. circuit as claimed in claim 4, it is characterized in that, described first switching tube is NPN type triode, the base stage of described NPN type triode is the control end of described first switching tube, the input of very described first switching tube of current collection of described NPN type triode, the output of very described first switching tube of transmitting of described NPN type triode;
Described 3rd switching tube is P type metal-oxide-semiconductor, and the source electrode of described P type metal-oxide-semiconductor is the input of described 3rd switching tube, and the drain electrode of described P type metal-oxide-semiconductor is the output of described 3rd switching tube, and the grid of described P type metal-oxide-semiconductor is the control end of described 3rd switching tube.
6. circuit as claimed in claim 1, it is characterized in that, described charhing unit comprises:
Resistance R1, resistance R7, electric capacity C1, electric capacity C2, electric capacity C3, LED 2 and charging management chip;
The input that the power end (VCC) of described charging management chip is described charhing unit simultaneously with one end of described electric capacity C1, one end of described resistance R1 connects, the other end ground connection of described electric capacity C1, the other end of described resistance R1 is connected with the anode of described LED 2, the negative electrode of described LED 2 is connected with the charged state indication end (CH) of described charging management chip, the constant current charge electric current of described charging management chip arranges end (PG) by described resistance R7 ground connection, the earth terminal ground connection of described charging management chip, the output that the battery-end (BAT) of described charging management chip is described charhing unit simultaneously with described electric capacity C2, one end of described electric capacity C3 connects, described electric capacity C2, the other end ground connection simultaneously of described electric capacity C3.
7. circuit as claimed in claim 1, it is characterized in that, described OTG selective charge circuit also comprises:
Interface unit and resistance R6;
Described interface unit is as the input of described OTG selective charge circuit, first port of described interface unit is connected with one end of described resistance R6, the other end of described resistance R6 is connected with the input of described input voltage measurement unit, and the 4th port of described interface unit is that the pincers of described OTG selective charge circuit are determined voltage receiving terminal and are connected with the control end of described charging switching element.
8. circuit as claimed in claim 7, it is characterized in that, described OTG selective charge circuit also comprises:
First magnetic bead, the second magnetic bead and the 3rd magnetic bead;
One end of described first magnetic bead is connected with the second port of described interface unit, and the other end of described first magnetic bead is connected with a digital audio differential input end (DM);
One end of described second magnetic bead is connected with the 3rd port of described interface unit, and the other end of described second magnetic bead is connected with another digital audio differential input end (DP);
One end of described 3rd magnetic bead is connected with the five-port of described interface unit, the other end ground connection of described 3rd magnetic bead.
9. circuit as claimed in claim 7 or 8, it is characterized in that, described interface unit is MICROUSB socket.
10. a portable audio, is characterized in that, described portable audio comprises the OTG selective charge circuit as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510066850.6A CN104701933B (en) | 2015-02-09 | 2015-02-09 | OTG selective charging circuit and portable loudspeaker box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510066850.6A CN104701933B (en) | 2015-02-09 | 2015-02-09 | OTG selective charging circuit and portable loudspeaker box |
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| CN104701933A true CN104701933A (en) | 2015-06-10 |
| CN104701933B CN104701933B (en) | 2017-05-17 |
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| CN107221983A (en) * | 2017-07-06 | 2017-09-29 | 建荣半导体（深圳）有限公司 | A kind of charging control circuit and audio frequency apparatus |
| CN107331909A (en) * | 2017-06-05 | 2017-11-07 | Tcl移动通信科技（宁波）有限公司 | A kind of OTG output voltage control methods, storage device and mobile terminal |
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| CN104701933B (en) | 2017-05-17 |
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