CN2267581Y - Rechargeable hands-free handset for mobile phone - Google Patents

Abstract

A chargeable mobile telephone hand-free receiver device includes a charging circuit and a hand-free receiver circuit, the hand-free receiver circuit includes a main integrated circuit, a microphone and a loudspeaker, the microphone is connected with an input end of the main integrated circuit, and is connected with an interface by its output end, the microphone signal can be connected with the mobile telephone transmitting end by the balance controller, transmission gain amplifier and interface in the main integrated circuit, the incoming signal of the opposite side sent by the mobile telephone is sent in by the other end of the mobile telephone interface and is connected with an acoustic signal input end of the main integrated circuit, and is processed by the receiving amplifier, balance gain amplifier and receiving gain amplifier in the main integrated circuit, and then is output to the loudspeaker by the receiving gain amplifier.

Description

Chargeable mobile telephone holding-free earphone device

The utility model relates to a kind of chargeable mobile telephone holding-free earphone device, mainly be at mobile phone used on the orthodox car because of not being equipped with Handless, very dangerous shortcoming in driving and a kind of microphone of designing forms one with loud speaker and have the device of charge function.

When general mobile phone uses in car, automobile is supplied with required power supply and to the rechargeable battery charging of inside, because mobile phone is identical with regular phone, all must grip with hand, but for the driver in the driving, then produce the doubt on the safety, because the circuit of microphone and loud speaker is separate structure, not only circuit is complicated, and microphone and loud speaker line and mobile phone join respectively, promptly produce most line guys and be positioned at the front stall place, not only hinder attractive in appearance, more may be because of the winding of complicated circuit, cause the operating safety that hinders with running, because traditional structure is just like above-mentioned several shortcomings, necessity that improved is arranged and simplify in fact.

It is a kind of with same integrated circuit and same mobile phone interface processing that main purpose of the present utility model is to provide, and obtain to be combined in the chargeable mobile telephone holding-free earphone device of one.

Another purpose of the present utility model is to provide a kind of chargeable mobile telephone holding-free earphone device with charging and status display function.

Another purpose of the present utility model is to provide a kind of simplified construction and chargeable mobile telephone holding-free earphone device easy to use.

For achieving the above object, the utility model is taked following technical scheme:

Master integrated circuit of the present utility model is with microphone amplifier, balance controller, transmit gain amplifier, reception amplifier and receiving gain amplifier constitute independent and complete Handless treatment circuit, with after being positioned at microphone on the casing and receiving the signal give orders or instructions, promptly directly sending into master integrated circuit amplifies, send on the mobile phone through a mobile phone interface (plug) again, to obtain the effect of giving orders or instructions of Handless, and the signal of the other side's calling also is to send into through this mobile phone interface equally, and after another amplifying return circuit of this same master integrated circuit carries out necessary amplification and handles, be positioned at loud speaker on the casing by one and send voice sound after amplifying, reach the function that Handless is talked about, and previous constructions is with same integrated circuit and same mobile phone interface processing, and obtains the integrated design of one.

The utility model is provided with switching circuit, detects the charging circuit that loop, pulse width modulation circuit and Current Control comparison loop etc. are formed in casing, this charging circuit is in the pulse width modulation circuit mode mobile phone to be charged, and this testing circuit more can show that with a Current Control comparison loop and of being made up of first, second differential amplifier the show circuit of mobile phone charged state is connected, so that the utility model not only has concurrently outside the effect of aforementioned Handless, have more the function that mobile phone charging and state show.

In the utility model, show circuit includes the indicator light that majority can be indicated power supply status, battery charging state and Handless user mode respectively, reaches its behaviour in service of certain grasp.

Device of the present utility model specifically is expressed as follows:

Chargeable mobile telephone holding-free earphone device of the present utility model is formed with master integrated circuit, microphone, loud speaker, it is characterized in that:

Microphone is connected on the input of master integrated circuit, and be connected with a mobile phone interface by corresponding output, this microphone signal is through the balance controller of master integrated circuit inside, the transmission gain amplifier, mobile phone interface and can being connected with the mobile phone first speaker, and the other side's calling signal that mobile phone is sent, then send into by the other end at mobile phone interface, and be connected with another sound input end of master integrated circuit, reception amplifier through master integrated circuit inside, balance multiplier (-icator) and receiving gain amplifier, connect loud speaker with the output of receiving gain amplifier again, by the sound signal of loud speaker output calling.

The mobile telephone holding-free earphone device of aforesaid attached charging is characterized in that: the receiving gain amplifier input terminal serial connection electric capacity and the variable resistor of master integrated circuit, and for adjusting the voice output volume.

The mobile telephone holding-free earphone device of aforesaid attached charging wherein is provided with charging circuit in addition, is with direct current DC converting circuit, detection loop, pulse width modulation circuit (PWM), Current Control comparison loop and show circuit to be formed, and it is characterized in that:

Direct current is constituted with two transistors that are connected in series mutually DC converting circuit, its output joint detection loop, this detection loop is constituted with rechargeable battery and transistor and error indicator, this transistor output is divided into two-way, one is connected to wrong indicator light, another is connected to switching circuit, and the Current Control comparison loop that an other route first differential amplifier and second differential amplifier are formed, promote again to be connected in series indicating device in the charging respectively and to be full of the show circuit of indicating device with two transistor, demonstration for different conditions, and switching circuit pulse width-modulated circuit (PWM) in regular turn, dividing potential drop is adjusted circuit, and an output voltage is adjusted in supply.

The utlity model has following effect:

The utility model not only has the effect of Handless concurrently, has more the function that mobile phone charging and state show.And in the mobile telephone holding-free earphone device of attached charging of the present utility model, this show circuit is to contain the indicator light that majority can be indicated power supply status, battery charging state and Handless user mode respectively, can reach its behaviour in service of certain grasp, and above-mentioned every structure all is combined in one, and simplified construction and advantage easy to use are arranged.

Further specify specific structural features of the present utility model and purpose below in conjunction with drawings and Examples.

Brief Description Of Drawings:

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is a circuit diagram of the present utility model.

Fig. 3 is a stereo appearance figure of the present utility model.

As shown in Figure 1, the drawing upper and lower region is divided into charging circuit and Handless circuit, it is that a kind of mobile phone that cooperates uses, and can receive the voiced sound tone signal and make mobile phone receive the amplification of the other side's message by microphone, and play out by loudspeaker, more can charge to mobile phone simultaneously, charging circuit is with switching circuit 10, detect loop 20, pulse width modulation loop (PWM) 30, Current Control comparison loop 40 and show circuit 50 are formed, be to pick out DC power supply 11 by automotive interior, be connected to switching circuit 10 in regular turn and detect loop 20, it detects loop 20 and is divided into two-way output, the one road connects pulse width modulation circuit (PWM) 30, the pulse of output modulation is connected to output and adjusts voltage 34 (as Fig. 2), the charging voltage of battery is provided, and feedbacks to switching circuit 10 and constitute a path, and other one the tunnel through Current Control comparison loop 40, its output is connected to show circuit 50, for mistake, the cresset of states such as charging or full state shows;

Its DC power supply 11 outputs connect a voltage stabilizing circuit 60, provide drawing below Handless circuit working required power supply, and this Handless circuit is actually with a main body integrated circuit 70 formations (for commercially available signal receiving/transmission amplification circuit (as SHARP3N81 type integrated circuit)), shown in frame of broken lines, inside is with microphone amplifier 71, balance controller 72, transmit gain amplifier 73, reception amplifier 74 and receiving gain amplifier 75 are formed, this microphone amplifier 71, balance controller 72, transmit gain amplifier 73 series connection and form the amplifying return circuit of giving orders or instructions, and input and output can be for connecting microphone 76 and mobile phone interface 80 respectively, and the reception amplifier 74 of this Handless circuit 70,75 in balance controller 72 and receiving gain amplifier are formed a reception amplifier, the signal that mobile phone interface 80 is sent into can be amplified, and play out the voice of calling by a loud speaker 77.

Above-mentioned explanation can be found out basic circuit structure of the present utility model, as for the state of detailed circuit and action thereof, as described below:

See also shown in Figure 2, shown in establish on the figure upper left side is a switching circuit 10, transistor Q3 with two serial connections, Q6 constitutes, and form an electronic switch loop, its output is connected to the testing circuit 20 of the drawing rightmost side, and testing circuit 20 is with rechargeable battery 21, resistance R 25, transistor Q4 and wrong indicator light 22 are connected to form, when rechargeable battery 21 wrong accesses or short circuit, and through divider resistance R25, R21 reduces transistor Q4 base potential, and the error indicator 22 of transistor Q4 conducting and transistor Q4 serial connection is lighted, with the misdirection state, and transistor Q4 collector electrode joins with switching circuit 10 through another transistor Q5, and testing circuit 20 detects when being output as short circuit, makes the two transistor Q3 of switching circuit 10, Q6 ends, and provides to stop the protection that power supply is supplied with;

Pulse width modulation circuit (PWM) 30 adjusts circuit 34 with pulse converter 31, Schottky diode 32, inductance 33 and dividing potential drop and formed, and the output of testing circuit 20 is to be connected pulse converter 31 two ends with transistor Q5, pulse converter 31 outputs are connected the Schottky diode 32 and the inductance 33 of quick switching, to produce the pulse of different in width after the relative modulation, the output serial connection of its inductance 33 is adjusted circuit 34 with the dividing potential drop that resistance 36, electric capacity 35 constitute, and adjusts the charging voltage value that circuit 34 is adjusted rechargeable battery 21 with dividing potential drop.

Current Control comparison loop 40 is with first, second differential amplifier 41,42 form, the end points that this rechargeable battery 21 is connected in series with current detection resistor R20 is connected in the anode 411 of first differential amplifier 41, its negative terminal 412 is with resistance R 15, R16 constitutes a back coupling ratio resistance, to determine the magnification ratio of first differential amplifier 41, output 413 one of its differential voltage are connected to the negative terminal 422 of second differential amplifier 42, another is connected in the pulse width modulation circuit (PWM) 30, can be when charging current changes, the keying of the pulse converter 31 of control impuls width modulation circuit (PWM) 30, reach the effect of control charging current, and second differential amplifier, 42 its anodes are through shunt resistance R13, R14 and voltage stabilizing circuit 60 join, its output connects show circuit 50, show circuit 50 be with and two transistor Q2, Q3 forms, respectively in the control charging indicating device 51 be full of indicating device 52 so that the charge condition of indication rechargeable battery 21.

Place, lower left at Fig. 2 is provided with the microphone 76 that receives voice signal, its output is connected to the microphone amplifier 71 of master integrated circuit 70 inside, after its voice signal amplification, resistance 721 through Balance Control 72 and the connection of relevant pin, 722,723, the balance output valve of 724 gained, be connected to the output of the commissure electric capacity 725 outside the master integrated circuit 70 again, after the inner transmission gain amplifier 73 of connection amplifies signal again, the commissure electric capacity 731 that output connects is to the socket 81 and the plug J2 at the interface 80 of mobile phone, J3 is for being connected with the loop of giving orders or instructions of mobile phone;

The voice signal that mobile phone is sent is through mobile phone interface 80, be connected to the input of the reception amplifier 74 of master integrated circuit 70 inside through electric capacity 741 by the plug J3 on right side, reception amplifier 74 its outputs are connected to volume controller 78 contained electric capacity 781 and variable resistor 782, adjust the signal magnitude of output volume by the change of adjusting resistance value, again adjusted signal is connected to receiving gain amplifier 75, make output signal deliver to loud speaker 77 places again, reach the effect of being talked about of Handless through commissure electric capacity 771.

And the state of aforementioned charging circuit and Handless circuit, can be assembled in the housing fully, can be shown in the stereo appearance figure of Fig. 3 on its execution mode, promptly the housing 90 that is formed with cigarette lighter plug 91 with a front end is reached, after utilizing this cigarette lighter plug 91 and the cigarette lighter socket of automobile to peg graft, can directly obtain required electric power, and housing 90 inside promptly are equipped with aforementioned every circuit structure, upper face center and nearly back-end location form the aforementioned loud speaker 77 that amplifies respectively, the power supply indicator 94 of giving orders or instructions microphone 76 and being arranged in a linear, communication indicator light 93 and charging indicator light 92, housing end after 90s then connects one with soft cable 95 and specializes in grafting mobile phone 96 and be the mobile phone interface 80 of corresponding plug pattern, the volume controller 78 of one adjustable as described above whole loud speaker 77 output volume sizes is set in a side of housing 90 in addition, so with this outward appearance, housing 90 two ends are lit a cigarette after socket and mobile phone 96 be connected with vehicle respectively, provide a kind of and have the function that to give orders or instructions and to be talked about interface 80 charging and the Handless of mobile phone concurrently, and be one to use quite easy and can improve the device of the travel safety of automobile.

Housing 90 appearance of above-mentioned Fig. 3 and outward appearance only are one embodiment, in fact the utility model mainly provides a kind of interconnected relationship that has the circuit structure at charging circuit, Handless circuit and mobile phone interface concurrently, Lu and can adopt the housing of any pattern to form in the practical application.

Claims (3)

1. a chargeable mobile telephone holding-free earphone device is formed with master integrated circuit, microphone, loud speaker, it is characterized in that:

Described microphone is connected on the input of master integrated circuit, and be connected with a mobile phone interface by corresponding output, this microphone signal is the balance controller through master integrated circuit inside, the transmission gain amplifier, the mobile phone interface can be connected with the mobile phone first speaker, the other side's calling signal that mobile phone is sent, the other end by the mobile phone interface is sent into, and be connected with another sound input end of master integrated circuit, reception amplifier through master integrated circuit inside, balance multiplier (-icator) and receiving gain amplifier, connect loud speaker with the output of receiving gain amplifier again, by the sound signal of loud speaker output calling.

2. chargeable mobile telephone holding-free earphone device according to claim 1 is characterized in that: the receiving gain amplifier input terminal serial connection of described master integrated circuit is for electric capacity and the variable resistor of adjusting the voice output volume.

3. chargeable mobile telephone holding-free earphone device according to claim 1, it is characterized in that: wherein also be provided with a charging circuit, formed with DC converting circuit, detection loop, pulse width modulation circuit (PWM), Current Control comparison loop and show circuit;

Described DC converting circuit is constituted with two transistors that are connected in series mutually, its output joint detection loop, this detection loop is constituted with rechargeable battery and transistor and error indicator, this transistor output is divided into two-way, one the road is connected to wrong indicator light, another road is connected to switching circuit, the Current Control comparison loop that it is made up of first differential amplifier and second differential amplifier, promote again to be connected in series indicating device in the charging respectively and to be full of the show circuit of indicating device with two transistor, demonstration for different conditions, and switching circuit pulse width-modulated circuit (PWM) in regular turn, dividing potential drop is adjusted circuit, and an output voltage is provided.

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