CN203136141U - A power switching circuit of a Bluetooth earphone - Google Patents
A power switching circuit of a Bluetooth earphone Download PDFInfo
- Publication number
- CN203136141U CN203136141U CN 201320041162 CN201320041162U CN203136141U CN 203136141 U CN203136141 U CN 203136141U CN 201320041162 CN201320041162 CN 201320041162 CN 201320041162 U CN201320041162 U CN 201320041162U CN 203136141 U CN203136141 U CN 203136141U
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- Prior art keywords
- power supply
- bluetooth earphone
- diode
- power
- commutation circuit
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Abstract
The utility model discloses a power switching circuit of a Bluetooth earphone. The power switching circuit comprises a power management chip and a power switching sub circuit. The first end of the power switching sub circuit is connected with the power supplying end of the power switching circuit. The second end of the power switching sub circuit is connected with a battery of the Bluetooth earphone. The third end of the power switching sub circuit is connected with the IN end of the power management chip. The EN end of the power management chip is connected with the power supplying end of the power switching circuit. The OUT end of the power management chip is connected with the power management end of the Bluetooth earphone. When the Bluetooth earphone is placed on a main machine, a power supplying channel between the battery and the Bluetooth earphone is cut off by the power switching sub circuit and the main machine supplies power for the Bluetooth earphone. When the Bluetooth earphone is separated from the main machine, the battery is switched to supply power by the power switching sub circuit. Therefore, unnecessary charge waste is prevented. The using time of the battery is reduced. The operating temperature of the battery is guaranteed and high temperature is prevented from damaging the battery. The service life of the battery is prolonged.
Description
Technical field
The utility model relates to the vehicle carried video equipment technical field, particularly a kind of power supply commutation circuit of bluetooth earphone.
Background technology
At present, all be provided with on-vehicle Bluetooth system on many automobiles, the main frame of the mobile phone of Bluetooth function and automobile, as the sound equipment collocation together will be arranged in use, make things convenient for the car owner at the time can the automatically switch sound of sound equipment of incoming call, be connected with mobile phone and carry out hand-free call, fail safe, convenience so that raising is driven reduce traffic accident hidden danger.If the bluetooth on vehicle-mounted should realize being placed on fooled hands-free use of main frame, can take off when traditional bluetooth earphone use from main frame again, this just need can provide working power for it when bluetooth earphone is taken off.
Existing bluetooth earphone can select for use common battery to power on the market.And the working temperature of battery is 0 ~ 45 ℃ when charging, is-20 ~ 60 ℃ during discharge.Battery can charge and discharge cycles reach 300 times, and at present the highest can reach charge and discharge cycles 1000 times.Because the working temperature of vehicle electronics product is required to work under 60 ℃ environment, can generate heat during head circuit work simultaneously and its structural limitations heat sinking function relatively poor.If battery is worked under 60 ℃ of environment, the actual working temperature that records of battery has surpassed 60 ℃.Particularly when the working temperature of battery surpasses 80 ℃, overheatedly may cause internal short-circuit of battery, make battery Fa Re ﹑ Mao Yan ﹑ distortion or burning.
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 power supply commutation circuit of bluetooth earphone, can select corresponding power supply according to the use state of bluetooth earphone, to improve the useful life of battery.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of power supply commutation circuit of bluetooth earphone, it comprises power management chip and is used for selecting the power supply of corresponding power supply to switch electronic circuit according to the use state of bluetooth earphone;
First end that described power supply switches electronic circuit connects the feeder ear that is used for bluetooth earphone is carried out the power supply commutation circuit of main frame power supply, power supply switches the battery of second end connection bluetooth earphone of electronic circuit, and power supply switches the IN end of the 3rd end connection power management chip of electronic circuit; The EN end of described power management chip connects the feeder ear of power supply commutation circuit, and the OUT end of power management chip connects the power management end of bluetooth earphone; The GND end ground connection of power management chip.
The power supply commutation circuit of described bluetooth earphone, wherein, described power supply switches electronic circuit and comprises first diode and second diode, the positive pole of described first diode connects the feeder ear of power supply commutation circuit, the negative pole of first diode connects the negative pole of second diode and the IN end of power management chip, and the positive pole of described second diode connects battery.
The power supply commutation circuit of described bluetooth earphone, it also comprises first electric capacity, an end of described first electric capacity connects the IN end of power management chip, the negative pole of first diode and the negative pole of second diode, the other end ground connection of first electric capacity.
The power supply commutation circuit of described bluetooth earphone, it also comprises second electric capacity and the 3rd electric capacity, an end of described second electric capacity is held the equal ground connection of the other end of the other end of second electric capacity and the 3rd electric capacity with the OUT that an end of the 3rd electric capacity all is connected power management chip.
The power supply commutation circuit of described bluetooth earphone, it also comprises first resistance and second resistance, one end of described first resistance connects the feeder ear of power supply commutation circuit and the positive pole of first diode, the other end of first resistance connects an end of second resistance and the EN end of power management chip, the other end ground connection of described second resistance.
The power supply commutation circuit of described bluetooth earphone, wherein, the resistance of described first resistance is 100K, the resistance of described second resistance is 100K.
A kind of main frame comprises bluetooth earphone, and it comprises the power supply commutation circuit of described bluetooth earphone, and described bluetooth earphone is arranged on the main frame, and the host power supply end of bluetooth earphone connects the power management module of main frame.
Described main frame, wherein, described main frame is the sound equipment of automobile, the host power supply end of described bluetooth earphone is connected with the feeder ear of the power management module of main frame by the contact interface for the feeder ear of power supply commutation circuit, the feeder ear of described power supply commutation circuit.
Compared to prior art, the power supply commutation circuit of the bluetooth earphone that the utility model provides is switched the power supply passage that electronic circuit cuts off battery and bluetooth earphone by power supply when bluetooth earphone is placed on the main frame, by main frame bluetooth earphone is powered; When bluetooth earphone leaves main frame, switch electronic circuit by power supply and automatically switch to powered battery, can control the supply power mode of bluetooth earphone so neatly, the battery electric weight waste that still power supply causes to bluetooth earphone when avoiding bluetooth earphone to be placed on the main frame, the useful life of having improved battery.
Description of drawings
Fig. 1 is the circuit theory diagrams of the power supply commutation circuit of the utility model bluetooth earphone.
Embodiment
The utility model provides a kind of power supply commutation circuit of bluetooth earphone, and is clearer, clear and definite for making the purpose of this utility model, technical scheme and effect, below further describes with reference to the accompanying drawing the utility model of embodiment that develops simultaneously.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
The power supply commutation circuit of the bluetooth earphone that the utility model provides can be arranged in the bluetooth earphone, and bluetooth earphone is dismountable, can hang on the main frame, also can take plug in ear from main frame.When bluetooth earphone hung on the main frame, the host power supply end of bluetooth earphone was connected with the contact of the power management module of main frame.Described contact connects just contact and connects, and is equivalent to the host power supply end of bluetooth earphone, namely the power feeder ear of commutation circuit connects the feeder ear of the power management module of main frame by the contact interface; When bluetooth earphone hangs on the main frame, the conducting of contact interface, the operating voltage that the feeder ear of described power management module provides input to bluetooth earphone the host power supply end, bluetooth earphone is powered; When bluetooth earphone was taken from main frame, the contact was contactless, and the contact interface disconnects, and had also just disconnected the power supply passage between the host power supply end of the feeder ear of power management module of main frame and bluetooth earphone, and main frame is no longer powered to bluetooth earphone.The power supply commutation circuit of described bluetooth earphone is controlled its supply power mode according to the state (hanging on the main frame and bluetooth earphone is taken two states from main frame as bluetooth earphone) that uses of bluetooth earphone, selects main frame to its power supply, disconnect the power supply passage of battery and bluetooth earphone simultaneously when namely bluetooth earphone hangs on the main frame; Bluetooth earphone switches to battery it is powered when main frame is taken.When setting forth present embodiment, the feeder ear of described main frame namely refers to the feeder ear of the power management module of main frame below.In the present embodiment, described main frame is the sound equipment of automobile.See also Fig. 1, the power supply commutation circuit of described bluetooth earphone comprises: power management chip U1 and power supply switch electronic circuit 100.Described power supply switches the feeder ear A of first end, the 1 connection power supply commutation circuit of electronic circuit 100, and power supply switches the battery BAT of second end, the 2 connection bluetooth earphones of electronic circuit 100, and power supply switches the IN end of the 3rd end 3 connection power management chip U1 of electronic circuit 100; The EN end of described power management chip U1 connects the feeder ear A of power supply commutation circuit, and the OUT end of power management chip U1 connects the power management end B of bluetooth earphone; The GND end ground connection of power management chip U1.Wherein, the feeder ear A of power supply commutation circuit is used for bluetooth earphone is carried out the main frame power supply, and first end 1 and second end 2 thereof that power supply switches electronic circuit 100 are equivalent to input, the feeder ear of the main frame that connection need be switched and battery BAT; The 3rd end 3 that power supply switches electronic circuit 100 is equivalent to output, the supply voltage after output is switched.Described power management chip U1 is the operating voltage of the bluetooth earphone of 3.3V with the voltage transitions that power supply switches the 3rd end 3 inputs of electronic circuit 100, and the bluetooth earphone of power management end B that inputs to bluetooth earphone is powered.
Described power supply switches electronic circuit 100 and is used for selecting corresponding power supply according to the use state of bluetooth earphone, and in the present embodiment, it comprises the first diode D1 and the second diode D2.The positive pole of the described first diode D1, be the feeder ear A that first end 1 that power supply switches electronic circuit 100 connects the power supply commutation circuit, the negative pole of the first diode D1 connects the negative pole of the second diode D2 and the IN end of power management chip U1, and the positive pole of the described second diode D2 connects battery BAT.The connected node of the negative pole of the negative pole of the first diode D1 and the second diode D2 is the 3rd end 3 that power supply switches electronic circuit 100.The first diode D1 and the second diode D2 play a part to select to isolate.Since the voltage that the voltage that the feeder ear of main frame provides is 5V is higher than battery BAT (voltage was 4.2V when battery was expired electricity), when bluetooth earphone hangs on the main frame, the first diode D1 conducting, the second diode D2 ends.The voltage of the 5V that the feeder ear of main frame provides is from the negative pole output of the first diode D1, and the voltage of battery BAT can not be exported.When bluetooth earphone was taken from main frame, the positive pole of the first diode D1 was equivalent to low level, the just very high level of the second diode D2, therefore, the first diode D1 ends, the second diode D2 conducting, and the voltage that has only battery BAT to provide is exported from the negative pole of the second diode D2.
Further, when switching, break-make can not disconnect power supply to bluetooth earphone in order to ensure the first diode D1 and the second diode D2, described power supply commutation circuit also comprises first capacitor C 1, one end of described first capacitor C 1 connects the IN end of power management chip U1, the negative pole of the first diode D1 and the negative pole of the second diode D2, the other end ground connection of first capacitor C 1.First capacitor C 1 is charged to it by the feeder ear of main frame, and when switch to battery BAT when power supply at the feeder ear by main frame, charge stored can be powered to bluetooth earphone on first capacitor C 1, is powered by battery BAT after waiting the complete conducting of the second diode D2.
Further, for the voltage that the OUT end of power management chip U1 is exported carries out filtering and noise reduction, and reduce the voltage fluctuation that causes when the first diode D1 and the second diode D2 break-make are switched, described power supply commutation circuit also comprises second capacitor C 2 and the 3rd capacitor C 3, one end of one end of described second capacitor C 2 and the 3rd capacitor C 3 all is connected the OUT end of power management chip U1, the equal ground connection of the other end of the other end of second capacitor C 2 and the 3rd capacitor C 3.
Further, when guaranteeing that bluetooth earphone is taken from main frame, the positive pole of the first diode D1 can make the second diode D2 conducting for low level, described power supply commutation circuit also comprises first resistance R 1 and second resistance R 2, one end of described first resistance R 1 connects the feeder ear A of power supply commutation circuit and the positive pole of the first diode D1, the other end of first resistance R 1 connects an end of second resistance R 2 and the EN end of power management chip U1, the other end ground connection of described second resistance R 2.In the present embodiment, the resistance of described first resistance R 1 is 100K, and the resistance of described second resistance R 2 is 100K.
Please continue to consult Fig. 1, be that sound equipment is example below with the main frame, sets forth operation principle of the present utility model respectively according to two kinds of use states of bluetooth earphone.
1, bluetooth earphone hangs on the main frame
Namely be that the user need converse by the sound equipment of automobile this moment, i.e. the hand-free function of bluetooth earphone.Because bluetooth earphone contacts with sound equipment, the power management module of sound equipment is powered to bluetooth earphone, the 5V voltage that the feeder ear of the power management module of sound equipment provides inputs to the positive pole of the first diode D1 from the feeder ear A of power supply commutation circuit, voltage than battery BAT is big, the then first diode D1 conducting, the second diode D2 ends.The 5V voltage that the feeder ear of sound equipment provides inputs to the IN end of power management chip U1, battery BAT hold with the IN of power management chip U1 and the negative pole of the first diode D1 between disconnect and being connected.Power management chip U1 with the 5V voltage transitions be behind the 3.3V voltage from its OUT end output, export to the bluetooth earphone power supply from power management end B.Like this battery BAT just can when main frame is powered to bluetooth earphone, disconnect and bluetooth earphone between the power supply passage, avoid unnecessary electric charge waste, reduced the service time of battery, guaranteed that the working temperature of battery avoids high temperature to the infringement of battery, improved battery and be to use the life-span.
2, bluetooth earphone is taken from main frame
Namely be that the user fills in bluetooth earphone and carries out telephone receiving in the ear this moment, because bluetooth earphone no longer contacts with sound equipment, the 5V voltage that the disconnection of contact interface causes the feeder ear of sound equipment to provide can not be imported the positive pole of the first diode D1, simultaneously the positive pole of the first diode D1 is drawn by first resistance R 1 and second resistance R 2 and is low level, the just very high level of the second diode D2, then the first diode D1 ends, the second diode D2 conducting.The voltage of battery BAT output inputs to the IN end of power management chip U1, exports to the bluetooth earphone power supply from power management end B after being converted into 3.3V voltage.
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 (8)
1. the power supply commutation circuit of a bluetooth earphone is characterized in that, comprises power management chip and switches electronic circuit for the power supply of selecting corresponding power supply according to the use state of bluetooth earphone;
First end that described power supply switches electronic circuit connects the feeder ear that is used for bluetooth earphone is carried out the power supply commutation circuit of main frame power supply, power supply switches the battery of second end connection bluetooth earphone of electronic circuit, and power supply switches the IN end of the 3rd end connection power management chip of electronic circuit; The EN end of described power management chip connects the feeder ear of power supply commutation circuit, and the OUT end of power management chip connects the power management end of bluetooth earphone; The GND end ground connection of power management chip.
2. the power supply commutation circuit of bluetooth earphone according to claim 1, it is characterized in that, described power supply switches electronic circuit and comprises first diode and second diode, the positive pole of described first diode connects the feeder ear of power supply commutation circuit, the negative pole of first diode connects the negative pole of second diode and the IN end of power management chip, and the positive pole of described second diode connects battery.
3. the power supply commutation circuit of bluetooth earphone according to claim 2, it is characterized in that, also comprise first electric capacity, an end of described first electric capacity connects the IN end of power management chip, the negative pole of first diode and the negative pole of second diode, the other end ground connection of first electric capacity.
4. the power supply commutation circuit of bluetooth earphone according to claim 2, it is characterized in that, also comprise second electric capacity and the 3rd electric capacity, one end of described second electric capacity is held the equal ground connection of the other end of the other end of second electric capacity and the 3rd electric capacity with the OUT that an end of the 3rd electric capacity all is connected power management chip.
5. the power supply commutation circuit of bluetooth earphone according to claim 2, it is characterized in that, also comprise first resistance and second resistance, one end of described first resistance connects the feeder ear of power supply commutation circuit and the positive pole of first diode, the other end of first resistance connects an end of second resistance and the EN end of power management chip, the other end ground connection of described second resistance.
6. the power supply commutation circuit of bluetooth earphone according to claim 5 is characterized in that, the resistance of described first resistance is 100K, and the resistance of described second resistance is 100K.
7. a main frame comprises bluetooth earphone, it is characterized in that, comprises the power supply commutation circuit of each described bluetooth earphone of claim 1-6, and described bluetooth earphone is arranged on the main frame, and the host power supply end of bluetooth earphone connects the power management module of main frame.
8. main frame according to claim 7, it is characterized in that, described main frame is the sound equipment of automobile, and the host power supply end of described bluetooth earphone is connected with the feeder ear of the power management module of main frame by the contact interface for the feeder ear of power supply commutation circuit, the feeder ear of described power supply commutation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320041162 CN203136141U (en) | 2013-01-25 | 2013-01-25 | A power switching circuit of a Bluetooth earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320041162 CN203136141U (en) | 2013-01-25 | 2013-01-25 | A power switching circuit of a Bluetooth earphone |
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| Publication Number | Publication Date |
|---|---|
| CN203136141U true CN203136141U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320041162 Expired - Fee Related CN203136141U (en) | 2013-01-25 | 2013-01-25 | A power switching circuit of a Bluetooth earphone |
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| CN (1) | CN203136141U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098853A (en) * | 2014-05-09 | 2015-11-25 | 荆延杰 | Portable equipment |
| CN105491473A (en) * | 2016-02-02 | 2016-04-13 | 深圳威武智能科技有限公司 | Bluetooth earphone with continuous power supply |
-
2013
- 2013-01-25 CN CN 201320041162 patent/CN203136141U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098853A (en) * | 2014-05-09 | 2015-11-25 | 荆延杰 | Portable equipment |
| CN105491473A (en) * | 2016-02-02 | 2016-04-13 | 深圳威武智能科技有限公司 | Bluetooth earphone with continuous power supply |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20130814 Termination date: 20200125 |
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| CF01 | Termination of patent right due to non-payment of annual fee |