CN203327224U - Dual-mode earphone circuit - Google Patents
Dual-mode earphone circuit Download PDFInfo
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- CN203327224U CN203327224U CN2013204477896U CN201320447789U CN203327224U CN 203327224 U CN203327224 U CN 203327224U CN 2013204477896 U CN2013204477896 U CN 2013204477896U CN 201320447789 U CN201320447789 U CN 201320447789U CN 203327224 U CN203327224 U CN 203327224U
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Abstract
The utility model discloses a dual-mode earphone circuit which comprises an active mode circuit and a passive mode circuit, and also comprises a switching circuit. The switching circuit comprises a switch element controlled by a negative level. The switch element comprises a first end, a second end and a control end which is used for controlling the first end and the second end. The first end is electrically connected with an audio signal AUDIO, and the second end is electrically connected with an audio output end SPK. The dual-mode earphone circuit further comprises a control circuit which controls on/off of the switching circuit by the negative level. The dual-mode earphone circuit is simple in structure, and active and passive functions of an earphone are simultaneously realized. Besides, when the earphone is at an active state or a passive state, the audio signal AUDIO is ensured to be transmitted to the audio output SPK through respective circuits.
Description
Technical field
The utility model relates to the earphone technical field, relates in particular to a kind of bimodulus head circuit.
Background technology
Usually earphone comprises that active earphone is that aggressive mode and Passive earphone are Passive Mode, after the audio signal AUDIO of active earphone inputs the DSP Digital Signal Processing after changing by A/D, output to the D/A change-over circuit, then, after the AMP amplifying circuit is processed, be sent in loud speaker; The audio signal AUDIO of Passive earphone also is sent in loud speaker after treatment.Existing a kind of earphone has the function of active earphone and Passive earphone simultaneously, but can not realize that earphone is under active or passive pattern, audio signal AUDIO is being sent to audio frequency output SPK after treatment, for example, under the Passive earphone pattern, audio signal AUDIO directly directly is sent in loud speaker by earphone cord, causes earphone tonequality not high.
The utility model content
The purpose of this utility model is to provide a kind of bimodulus head circuit, and while being intended to realize that earphone possesses active and Passive Mode function at the same time, audio signal AUDIO is sent to audio frequency output SPK after related circuit.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of bimodulus head circuit, comprise aggressive mode circuit and Passive Mode circuit, and also comprise:
Commutation circuit, described commutation circuit comprises the switch element that negative level is controlled, described switch element comprises first end and the second end and for controlling the control end of described first end and described the second end, described first end is electrically connected to audio signal AUDIO, and described the second end is electrically connected to audio output SPK;
Control circuit, described control circuit is controlled described commutation circuit conducting or cut-off with negative level.
Optimal way is, described switch element is the field effect transistor Q that negative level is controlled, its drain electrode is first end, its source electrode is the second end, its grid is control end, the drain electrode of described field effect transistor Q is connected with the negative electricity of diode D, and the positive pole of described diode D is electrically connected to the end of voltage-stabiliser tube D2, and the other end of described voltage-stabiliser tube D2 is electrically connected to the grid of described field effect transistor Q.
Optimal way is that described aggressive mode circuit comprises A/D change-over circuit, DSP digital signal processing circuit, D/A change-over circuit and the AMP amplifying circuit be electrically connected to successively.
Optimal way is that described control circuit comprises that external pump rises circuit and power amplification element, be provided with internal pump in described power amplification element and rise circuit, described power amplification element comprises control end SHDN, output OUT, and rise by described internal pump C1P end and the C1N end that circuit is drawn, described control end SHDN is electrically connected to the microcontroller signal, described output OUT is electrically connected to described second end of described switch element, described C1P end and C1N end rise circuit with described external pump respectively and are electrically connected to, described external pump rises circuit and is provided with output voltage terminal VCP, described output voltage terminal VCP is electrically connected to the described control end of described switch element through resistance R 7, audio signal AUDIO is electrically connected to described control circuit through described aggressive mode circuit.
Optimal way is that described power amplification element is the MAX9820 chip.
Optimal way is, described external pump rises circuit and comprises capacitor C 2, the two ends of described capacitor C 2 are electrically connected to the C1P of described power amplification element end and C1N end, described capacitor C 2 is connected with the negative electricity of diode D6 with the positive pole of diode D1 respectively with resistance R 2 through capacitor C 3, the negative pole of described diode D1 is electrically connected to-3.3 volts of power supplys, the positive pole of described diode D6 respectively with resistance R 4, one end of the negative pole of voltage-stabiliser tube D10 and resistance R 5 is electrically connected to, the other end of described resistance R 5 is electrically connected to an end of output voltage terminal VCP and capacitor C 4 respectively, the other end ground connection of capacitor C 4.
Optimal way is, described control circuit comprises negative voltage transition element and triode Q1, the base stage of described triode Q1 is electrically connected to the microcontroller signal, grounded emitter, collector electrode is electrically connected to power supply VCC through resistance R 11, described negative voltage transition element comprises input and output, and described input is electrically connected to the collector electrode of described triode Q1, and described output is electrically connected to the described control end of described switch element through resistance R 18;
Optimal way is that described negative voltage transition element is that negative voltage produces chip.
After adopting technique scheme, the beneficial effects of the utility model are: due to bimodulus head circuit described in the utility model, comprise aggressive mode circuit and Passive Mode circuit, also comprise commutation circuit and control circuit.Wherein commutation circuit also is provided with switch element, and control circuit is for conducting and cut-off commutation circuit, i.e. conducting and cutoff switch element.When earphone aggressive mode circuit, audio signal AUDIO passes to audio frequency output SPK through the aggressive mode circuit, and now the Passive Mode circuit is cut off; When the Passive Mode circuit, audio signal AUDIO is sent to audio frequency output SPK through the switch element of commutation circuit.The utility model adopts simple circuit structure, has realized that earphone is no matter initiatively or, under Passive Mode, audio signal AUDIO is sent to audio frequency output SPK after suitable circuit.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment mono-;
Fig. 2 is the circuit diagram of the utility model embodiment bis-.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Embodiment mono-:
As shown in Figure 1, a kind of bimodulus head circuit comprises aggressive mode circuit and Passive Mode circuit, also comprise commutation circuit, described commutation circuit comprises the switch element that negative level is controlled, described switch element comprises first end and the second end and for controlling the control end of described first end and described the second end, described first end is electrically connected to audio signal AUDIO, and described the second end is electrically connected to audio output SPK; Control circuit, described control circuit is controlled described commutation circuit conducting or cut-off with negative level.
Wherein switch element is the field effect transistor Q that negative level is controlled, its drain electrode is first end, its source electrode is the second end, its grid is control end, the drain electrode of described field effect transistor Q is connected with the negative electricity of diode D, the positive pole of described diode D is electrically connected to the end of voltage-stabiliser tube D2, and the other end of described voltage-stabiliser tube D2 is electrically connected to the grid of described field effect transistor Q.
Wherein the aggressive mode circuit comprises A/D change-over circuit, DSP digital signal processing circuit, D/A change-over circuit and the AMP amplifying circuit be electrically connected to successively.
Wherein field effect transistor Q is that negative level is controlled, and conducting when grid-control voltage is 0V ends during for-5V.
Wherein in power amplification element, be provided with internal pump and rise circuit, this power amplification element comprises control end SHDN, output OUT, and rise by described internal pump C1P end and the C1N end that circuit is drawn, wherein control end SHDN is electrically connected to the microcontroller signal, wherein output OUT is electrically connected to the source electrode of field effect transistor Q, wherein C1P end and C1N hold and rise circuit with external pump respectively and be electrically connected to, this external pump rises circuit and is provided with output voltage terminal VCP, this output voltage terminal VCP is electrically connected to the grid of field effect transistor Q through resistance R 7, audio signal AUDIO is electrically connected to described control circuit through described aggressive mode circuit.
Wherein power amplification element MAX9820 is a kind of power amplifier directly driven with outer gain.
During work; earphone enters aggressive mode; microcontroller signal MCU_I/O controls the MAX9820 chip; make its output voltage terminal VCP output voltage be-5V;-5V voltage makes field effect transistor Q cut-off; audio signal AUDIO, after the aggressive mode processing of circuit, is sent to audio frequency output SPK from the output OUT of MAX9820 chip; Earphone enters Passive Mode, and during the earphone shutdown, microcontroller signal MCU_I/O controls the MAX9820 chip, and making its output voltage terminal VCP output voltage is 0V, and 0V voltage makes field effect transistor Q conducting, and audio signal AUDIO passes to audio frequency output SPK through field effect transistor Q; Earphone enters Passive Mode, earphone start or while connecing the AUDIO line, microcontroller signal MCU_I/O controls the MAX9820 chip and do not work, and making voltage end VCP output voltage is 0V, makes field effect transistor Q conducting, audio signal AUDIO passes to audio frequency output SPK through field effect transistor Q.
Embodiment bis-: basic identical with embodiment mono-, difference is:
As shown in Figure 2, wherein control circuit comprises negative voltage transition element and triode Q1, the base stage of this triode Q1 is electrically connected to microcontroller signal MCU_I/O, grounded emitter, collector electrode is electrically connected to power supply VCC through resistance R 11, and the negative voltage transition element adopts MAX660, and this MAX660 chip is provided with input and output, its input is electrically connected to the collector electrode of triode Q1, and its output is electrically connected to the grid of field effect transistor Q through resistance R 18.
Wherein the MAX660 chip is that a kind of negative voltage produces chip, inputs be output as-VCC of VCC.
During work, earphone enters aggressive mode, and microcontroller signal MCU_I/O is low level, makes triode Q1 cut-off, makes MAX660 chip output voltage be-5V, makes field effect transistor Q cut-off, and audio signal AUDIO is sent to audio frequency output SPK through the aggressive mode circuit; Earphone enters Passive Mode, and during the earphone shutdown, microcontroller signal MCU_I/O is high level, makes triode Q1 conducting, and making MAX660 chip output voltage is 0V, makes field effect transistor Q conducting, and audio signal AUDIO passes to audio frequency output SPK through field effect transistor Q; Earphone enters Passive Mode, earphone start or while connecing the AUDIO line, microcontroller signal MCU_I/O is high level, make triode Q1 conducting, making MAX660 chip output voltage is 0V, makes field effect transistor Q conducting, and audio signal AUDIO passes to audio frequency output SPK through field effect transistor Q.
In other embodiment of the present utility model, the negative voltage transition element can be also that other negative voltage produces chip, is for example LM2990, LM2991, LM7905, ICL7660A, LT1964, AP3012, MAX749, ME7660 etc.
The above preferred embodiment of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. a bimodulus head circuit is characterized in that: comprise aggressive mode circuit and Passive Mode circuit, also comprise:
Commutation circuit, described commutation circuit comprises the switch element that negative level is controlled, described switch element comprises first end and the second end and for controlling the control end of described first end and described the second end, described first end is electrically connected to audio signal AUDIO, and described the second end is electrically connected to audio output SPK;
Control circuit, described control circuit is controlled described commutation circuit conducting or cut-off with negative level.
2. bimodulus head circuit according to claim 1, it is characterized in that: described commutation circuit also comprises diode D and voltage-stabiliser tube D2; Described switch element is the field effect transistor Q that negative level is controlled, its drain electrode is first end, its source electrode is the second end, its grid is control end, the drain electrode of described field effect transistor Q is connected with the negative electricity of described diode D, the positive pole of described diode D is electrically connected to the end of described voltage-stabiliser tube D2, and the other end of described voltage-stabiliser tube D2 is electrically connected to the grid of described field effect transistor Q.
3. bimodulus head circuit according to claim 1 is characterized in that: described aggressive mode circuit comprises A/D change-over circuit, DSP digital signal processing circuit, D/A change-over circuit and the AMP amplifying circuit be electrically connected to successively.
4. according to the described bimodulus head circuit of claims 1 to 3 any one, it is characterized in that: described control circuit comprises that external pump rises circuit and power amplification element, be provided with internal pump in described power amplification element and rise circuit, described power amplification element comprises control end SHDN, output OUT, and rise by described internal pump C1P end and the C1N end that circuit is drawn, described control end SHDN is electrically connected to the microcontroller signal, described output OUT is electrically connected to described second end of described switch element, described C1P end and C1N end rise circuit with described external pump respectively and are electrically connected to, described external pump rises circuit and is provided with output voltage terminal VCP, described output voltage terminal VCP is electrically connected to the described control end of described switch element through resistance R 7, audio signal AUDIO is electrically connected to described control circuit through described aggressive mode circuit.
5. bimodulus head circuit according to claim 4, it is characterized in that: described power amplification element is the MAX9820 chip.
6. bimodulus head circuit according to claim 4, it is characterized in that: described external pump rises circuit and comprises capacitor C 2, the two ends of described capacitor C 2 are electrically connected to the C1P of described power amplification element end and C1N end, described capacitor C 2 is connected with the negative electricity of diode D6 with the positive pole of diode D1 respectively with resistance R 2 through capacitor C 3, the negative pole of described diode D1 is electrically connected to-3.3 volts of power supplys, the positive pole of described diode D6 respectively with resistance R 4, one end of the negative pole of voltage-stabiliser tube D10 and resistance R 5 is electrically connected to, the other end of described resistance R 5 is electrically connected to an end of output voltage terminal VCP and capacitor C 4 respectively, the other end ground connection of capacitor C 4.
7. according to the described bimodulus head circuit of claims 1 to 3 any one, it is characterized in that: described control circuit comprises negative voltage transition element and triode Q1, the base stage of described triode Q1 is electrically connected to the microcontroller signal, grounded emitter, collector electrode is electrically connected to power supply VCC through resistance R 11, described negative voltage transition element comprises input and output, described input is electrically connected to the collector electrode of described triode Q1, and described output is electrically connected to the described control end of described switch element through resistance R 18.
8. bimodulus head circuit according to claim 7 is characterized in that: described negative voltage transition element is that negative voltage produces chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204477896U CN203327224U (en) | 2013-07-25 | 2013-07-25 | Dual-mode earphone circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204477896U CN203327224U (en) | 2013-07-25 | 2013-07-25 | Dual-mode earphone circuit |
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| CN203327224U true CN203327224U (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204477896U Withdrawn - After Issue CN203327224U (en) | 2013-07-25 | 2013-07-25 | Dual-mode earphone circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103347232A (en) * | 2013-07-25 | 2013-10-09 | 青岛歌尔声学科技有限公司 | Dual-mode earphone circuit and audio output method |
-
2013
- 2013-07-25 CN CN2013204477896U patent/CN203327224U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103347232A (en) * | 2013-07-25 | 2013-10-09 | 青岛歌尔声学科技有限公司 | Dual-mode earphone circuit and audio output method |
| CN103347232B (en) * | 2013-07-25 | 2017-02-08 | 青岛歌尔声学科技有限公司 | Dual-mode earphone circuit and audio output method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131204 Effective date of abandoning: 20170208 |
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| AV01 | Patent right actively abandoned |