CN208971820U - Earphone insertion detection circuit, earphone isolation circuit and electronic equipment - Google Patents
Earphone insertion detection circuit, earphone isolation circuit and electronic equipment Download PDFInfo
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- CN208971820U CN208971820U CN201821485141.7U CN201821485141U CN208971820U CN 208971820 U CN208971820 U CN 208971820U CN 201821485141 U CN201821485141 U CN 201821485141U CN 208971820 U CN208971820 U CN 208971820U
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Abstract
The utility model discloses an earphone insertion detection circuit, which comprises a signal detection end, a voltage output end, an earphone interface, a switch tube, a first resistor and a second resistor; an elastic switch is arranged between a first sound channel pin of the earphone interface and the earphone insertion detection pin; the first end of the first resistor is connected with a first sound channel pin of the earphone interface, and the second end of the first resistor is grounded; the first end of the second resistor is connected with the voltage output end, and the second end of the second resistor is connected with an earphone insertion detection pin of the earphone interface; the first end of switch tube is connected with the earphone insertion detection pin of earphone interface, and the second end of switch tube is connected with the signal detection end, and the third end of switch tube is connected between the first end of voltage output end and second resistance. The utility model also discloses an earphone buffer circuit and an electronic equipment. Adopt the embodiment of the utility model provides a, can effectively examine the earphone and insert, thereby make electronic equipment's master control circuit can carry out corresponding linkage setting.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to an earphone inserts detection circuitry, earphone isolating circuit and electronic equipment.
Background
An earphone is a transducer unit that receives electrical signals from a media player or receiver and converts them into audible sound waves using a speaker proximate to the ear. The headset is typically detachable from the media player or receiver and is connected using a headset plug. With the continuous development of portable terminal devices, earphones are widely used in mobile terminals such as mobile phones, walkmans, radios, portable electronic games, and digital music players. The earphone plug structure is adapted to an earphone socket installed on the mobile terminal, the earphone socket realizes the coupling between input and output audio frequencies by adding transformers in output circuit parts of a left earphone and a right earphone, but the earphone socket in the prior art does not have an insertion detection function, so that the main control chip of the mobile terminal cannot perform other linkage setting when the earphone is inserted, for example, the main control chip of the earphone cannot turn off the sound setting function of the whole set of speakers when the earphone is inserted.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an earphone inserts detection circuitry, earphone isolating circuit and electronic equipment can effectively examine the earphone and insert, thereby makes electronic equipment's master control circuit can carry out corresponding linkage setting.
In order to achieve the above object, an embodiment of the present invention provides an earphone insertion detection circuit, which includes a signal detection terminal, a voltage output terminal, an earphone interface, a switch tube, a first resistor and a second resistor; wherein,
an elastic switch is arranged between a first sound channel pin of the earphone interface and an earphone insertion detection pin;
the first end of the first resistor is connected with a first sound channel pin of the earphone interface, and the second end of the first resistor is grounded;
the first end of the second resistor is connected with the voltage output end, and the second end of the second resistor is connected with an earphone insertion detection pin of the earphone interface;
the first end of the switch tube is connected with an earphone insertion detection pin of the earphone interface, the second end of the switch tube is connected with the signal detection end, and the third end of the switch tube is connected between the voltage output end and the first end of the second resistor.
Compared with the prior art, the utility model discloses an earphone inserts detection circuitry, when no earphone inserts the earphone interface, first sound channel pin is connected with the elastic switch that earphone inserted between the detection pin, produces the partial pressure between this moment first resistance and the second resistance for the voltage of the third end of switch tube is greater than the voltage of the first end of switch tube, thereby makes the switch tube switch on, and then the signal detection end detects voltage signal; when an earphone is inserted into the earphone interface, the elastic switch between the first sound channel pin and the earphone insertion detection pin is disconnected, so that the voltage of the third end of the switch tube is no longer greater than the voltage of the first end of the switch tube, the switch tube is disconnected, the signal detection end cannot detect a voltage signal, and whether the earphone is inserted or not can be determined according to the voltage detected by the signal detection end. The problem that the master control chip of the mobile terminal cannot detect that the earphone is inserted and other linkage setting is carried out when the earphone is inserted due to the fact that the earphone socket in the prior art is not inserted with a detection function is solved, the earphone insertion can be effectively detected, and therefore the master control circuit can carry out corresponding linkage setting.
As an improvement of the above scheme, the earphone insertion detection circuit further includes a third resistor, and the third resistor is connected between the earphone insertion detection pin of the earphone interface and the first end of the switch tube.
As an improvement of the above scheme, the earphone insertion detection circuit further includes a fourth resistor, a first end of the fourth resistor is connected between the signal detection end and the second end of the switch tube, and a second end of the fourth resistor is grounded.
As an improvement of the above scheme, the earphone insertion detection circuit further includes a fifth resistor, and the fifth resistor is connected between the signal detection end and the second end of the switch tube.
As an improvement of the above scheme, the first channel pin of the headphone interface is a right channel pin.
As an improvement of the above scheme, the switching tube is a P-channel MOS tube, the first end of the switching tube is a gate of the P-channel MOS tube, the second end of the switching tube is a drain of the P-channel MOS tube, and the third end of the switching tube is a source of the P-channel MOS tube.
In order to achieve the above object, an embodiment of the present invention further provides an earphone isolation circuit, which includes a first sound channel signal input terminal, a second sound channel signal input terminal, a first sound channel isolation circuit, a second sound channel isolation circuit, and the earphone insertion detection circuit according to any of the above embodiments; wherein,
the input end of the first sound channel isolation circuit is connected with the first sound channel signal input end, and the output end of the first sound channel isolation circuit is connected with a first sound channel pin of the earphone interface;
the input end of the second sound channel isolation circuit is connected with the signal input end of the second sound channel, and the output end of the second sound channel isolation circuit is connected with the pin of the second sound channel of the earphone interface.
As an improvement of the above scheme, the first channel isolation circuit includes a first transformer, and the first transformer includes a first primary winding and a first secondary winding; wherein,
the first end of the first primary winding is connected with the first sound channel signal input end, and the second end of the first primary winding is grounded; the first end of the first secondary winding is connected with a first sound channel pin of the earphone interface, and the second end of the first secondary winding is grounded.
As an improvement of the above scheme, the second channel isolation circuit includes a second transformer, and the second transformer includes a second primary winding and a second secondary winding; wherein,
the first end of the second primary winding is connected with the second channel signal input end, and the second end of the second primary winding is grounded; and the first end of the second secondary winding is connected with a second channel pin of the earphone interface, and the second end of the second secondary winding is grounded.
In order to achieve the above object, an embodiment of the present invention further provides an electronic device, including a main control circuit and the earphone isolation circuit according to any of the above embodiments; the master control circuit is connected with the signal detection end of the earphone isolation circuit.
Drawings
Fig. 1 is a circuit diagram of an earphone insertion detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an earphone isolation circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
Referring to fig. 1, fig. 1 is a circuit diagram of an earphone insertion detection circuit according to an embodiment of the present invention; the method comprises the following steps: the earphone comprises a signal detection end DET, a voltage output end OUT, an earphone interface CNA, a switching tube Q1, a first resistor R1 and a second resistor R2; wherein,
an elastic switch is arranged between a first sound channel Pin3 of the earphone interface CNA and an earphone insertion detection Pin Pin 6;
a first end of the first resistor R1 is connected to the first channel Pin3 of the headphone jack CNA, and a second end of the first resistor R1 is grounded;
a first end of the second resistor R2 is connected to the voltage output terminal OUT, and a second end of the second resistor R2 is connected to the earphone insertion detection Pin6 of the earphone interface CNA;
a first end of the switching tube Q1 is connected to the earphone insertion detection Pin6 of the earphone interface CNA, a second end of the switching tube Q1 is connected to the signal detection terminal DET, and a third end of the switching tube Q1 is connected between the voltage output terminal OUT and a first end of the second resistor R2.
It should be noted that, the elastic switch is a spring structure or a spring structure, and is disposed in the earphone interface CNA, for example, one end of the elastic switch is connected to the earphone insertion detection Pin6, and the other end of the elastic switch abuts against the first sound channel Pin 3.
Specifically, when the earphone interface CNA has no earphone inserted therein, the first channel Pin3 of the earphone interface CNA contacts the earphone insertion detection Pin6 through the elastic switch, so that the first channel Pin3 of the earphone interface CNA and the earphone insertion detection Pin6 are conducted, and at this time, a voltage division is generated between the first resistor R1 and the second resistor R2 at the voltage output end OUT, so that the voltage at the third end of the switching tube Q1 is greater than the voltage at the first end of the switching tube Q1, so that the switching tube Q1 is conducted, and the signal detection end DET has a voltage close to the voltage output end OUT.
Specifically, when an earphone is inserted into the earphone interface CNA, the elastic switch between the first channel Pin3 of the earphone interface CNA and the earphone insertion detection Pin6 is disconnected, and at this time, the first resistor R1 and the second resistor R2 do not generate a voltage division at the voltage output end OUT, so that the voltage at the third end of the switching tube Q1 is no longer greater than the voltage at the first end of the switching tube Q1, the switching tube Q1 is not turned on, and the voltage at the signal detection end DET is 0V.
Therefore, whether the earphone is inserted or not is determined according to the voltage detected by the signal detection end DET, the earphone can be effectively detected to be inserted, and therefore the main control circuit connected with the signal detection end DET is enabled to be correspondingly linked.
Preferably, the earphone insertion detection circuit further includes a third resistor R3, and the third resistor R3 is connected between the earphone insertion detection Pin6 of the earphone interface CNA and the first end of the switch tube Q1. The earphone insertion detection circuit further comprises a fourth resistor R4, a first end of the fourth resistor R4 is connected between the signal detection terminal DET and the second end of the switch tube Q1, and a second end of the fourth resistor R4 is grounded. The earphone insertion detection circuit further comprises a fifth resistor R5, and the fifth resistor R5 is connected between the signal detection terminal DET and the second terminal of the switching tube Q1. Specifically, the third resistor R3 is a current-limiting resistor; the fourth resistor R4 is a pull-down resistor, which can make the signal detection terminal DET output 0V quickly when the switching tube Q1 is turned off; the fifth resistor R5 plays a role in limiting current.
Preferably, the isolation of the ground prevents current flow between the audio output device and the audio input device due to voltage differences between the ground, which would otherwise generate audio noise. The resistance of the first resistor R1 is large enough (greater than 1Mohm) to prevent the first current between the ground GND and the high voltage ground HP _ GND from causing audio noise.
Preferably, the switching tube Q1 is a P-channel MOS tube, the first end of the switching tube Q1 is a gate of the P-channel MOS tube, the second end of the switching tube Q1 is a drain of the P-channel MOS tube, and the third end of the switching tube Q1 is a source of the P-channel MOS tube. Of course, the switching tube Q1 may be of another type, for example, when the resistance of the first resistor R1 is not very large, the switching tube Q1 may be a triode.
Preferably, the first channel Pin3 of the headphone interface CNA is a right channel Pin.
Furthermore, the earphone insertion detection circuit further comprises a first channel signal output end OUTR and a second channel signal output end OUTL; the first channel signal output terminal OUTR is connected to a first channel Pin3 of the headphone interface CNA, the second channel signal output terminal OUTL is connected to a second channel Pin4 of the headphone interface CNA, and a second channel Pin4 of the headphone interface CNA is a left channel Pin.
In specific implementation, when no earphone is inserted into the earphone interface CNA, the first channel Pin3 is connected to the elastic switch between the earphone insertion detection Pin6, and at this time, a voltage division is generated between the first resistor R1 and the second resistor R2, so that a voltage at the third end of the switching tube Q1 is greater than a voltage at the first end of the switching tube Q1, so that the switching tube Q1 is turned on, and the signal detection terminal DET detects a voltage signal; when an earphone is inserted into the earphone interface CNA, the elastic switch between the first channel Pin3 and the earphone insertion detection Pin6 is turned off, so that the voltage at the third end of the switching tube Q1 is no longer greater than the voltage at the first end of the switching tube Q1, and the switching tube Q1 is turned off, and then the signal detection terminal DET cannot detect a voltage signal, so that whether an earphone is inserted or not can be determined according to whether the voltage detected by the signal detection terminal DET is detected.
Compared with the prior art, the utility model discloses an earphone inserts detection circuitry has solved not inserting in the earphone socket among the prior art and has listened the function, so mobile terminal's main control chip can not listen to have the earphone to insert the problem of carrying out other linkage settings often, can effectively examine the earphone and insert to make main control circuit carry out corresponding linkage setting.
Example two
Further, the embodiment of the utility model provides a still provide an earphone buffer circuit. Referring to fig. 2, fig. 2 is a circuit diagram of an earphone isolation circuit according to an embodiment of the present invention; the method comprises the following steps: comprises a first channel signal input terminal INR, a second channel signal input terminal INL, a first channel isolation circuit 10, a second channel isolation circuit 20 and the earphone insertion detection circuit described in the first embodiment; wherein,
the input end of the first channel isolation circuit 10 is connected to the first channel signal input end INR, and the output end of the first channel isolation circuit 10 is connected to the first channel Pin3 of the earphone interface;
the input end of the second channel isolation circuit 20 is connected to the second channel signal input end INL, and the output end of the second channel isolation circuit 20 is connected to the second channel Pin4 of the headphone jack CNA.
Preferably, the first channel isolation circuit 10 includes a first transformer T1, and the first transformer T1 includes a first primary winding and a first secondary winding; wherein,
the first end of the first primary winding is connected with the first sound channel signal input end INR, and the second end of the first primary winding is grounded; a first end of the first secondary winding is connected to a first sound channel Pin3 of the headphone interface CNA, and a second end of the first secondary winding is grounded. Preferably, the second end of the first primary winding is connected to a ground line GND, and the second end of the first secondary winding is connected to a high-voltage ground line HP _ GND.
Preferably, the second channel isolation circuit 20 includes a second transformer T2, and the second transformer T2 includes a second primary winding and a second secondary winding; wherein,
the first end of the second primary winding is connected with the second channel signal input end INL, and the second end of the second primary winding is grounded; and the first end of the second secondary winding is connected with the second channel Pin4 of the earphone interface CNA, and the second end of the second secondary winding is grounded. Preferably, the second end of the second primary winding is connected to the ground GND, and the second end of the second secondary winding is connected to the high-voltage ground HP _ GND.
Specifically, the working process of the earphone insertion detection circuit refers to the working process of the earphone insertion detection circuit, and is not described herein again.
Preferably, the first channel signal input terminal INR is a right channel signal input terminal, and the first channel signal input terminal INR provides a signal output by the device to a right earplug in the headphone; the second channel signal input end INL is a left channel signal input end, and the second channel signal input end INL provides a signal output by the device to the left earplug in the earphone.
Specifically, the earphone isolation circuit couples the input and output audios through the first transformer T1 and the second transformer T2, so that the ground GND is isolated from the high-voltage ground HP _ GND, and the isolation of the ground can avoid the current generated between the audio output device and the audio input device due to the voltage difference between the ground, which may generate audio noise. The resistance of the first resistor R1 is large enough (greater than 1Mohm) to prevent the first current between the ground GND and the high voltage ground HP _ GND from causing audio noise.
In specific implementation, when no earphone is inserted into the earphone interface CNA, the first channel Pin3 is connected to the elastic switch between the earphone insertion detection Pin6, and at this time, a voltage division is generated between the first resistor R1 and the second resistor R2, so that a voltage at the third end of the switching tube Q1 is greater than a voltage at the first end of the switching tube Q1, so that the switching tube Q1 is turned on, and the signal detection terminal DET detects a voltage signal; when an earphone is inserted into the earphone interface CNA, the elastic switch between the first channel Pin3 and the earphone insertion detection Pin6 is turned off, so that the voltage at the third end of the switching tube Q1 is no longer greater than the voltage at the first end of the switching tube Q1, and the switching tube Q1 is turned off, and then the signal detection terminal DET cannot detect a voltage signal, so that whether an earphone is inserted or not can be determined according to whether the voltage detected by the signal detection terminal DET is detected.
Compared with the prior art, the utility model discloses an earphone isolating circuit has solved not inserting in the earphone socket among the prior art and has listened the function, so mobile terminal's main control chip can not listen to have the earphone to insert the problem of carrying out other linkage settings often, can effectively examine the earphone and insert to make main control circuit carry out corresponding linkage setting.
EXAMPLE III
Furthermore, an embodiment of the present invention provides an electronic device, which includes a main control circuit and the earphone isolation circuit; the master control circuit is connected with the signal detection end of the earphone isolation circuit. The specific structure of earphone buffer circuit can refer to the aforesaid the embodiment of the utility model provides a pair of earphone buffer circuit's explanation, no longer give unnecessary details here.
Compared with the prior art, the electronic equipment disclosed in the embodiment of the utility model has increased the earphone and has inserted the function of listening, thereby makes master control circuit has the earphone male function of listening, and then carries out corresponding linkage setting after inserting the earphone, for example the function of setting of turn-off complete machine loudspeaker sound after inserting the earphone.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. An earphone insertion detection circuit is characterized by comprising a signal detection end, a voltage output end, an earphone interface, a switching tube, a first resistor and a second resistor; wherein,
an elastic switch is arranged between a first sound channel pin of the earphone interface and an earphone insertion detection pin;
the first end of the first resistor is connected with a first sound channel pin of the earphone interface, and the second end of the first resistor is grounded;
the first end of the second resistor is connected with the voltage output end, and the second end of the second resistor is connected with an earphone insertion detection pin of the earphone interface;
the first end of the switch tube is connected with an earphone insertion detection pin of the earphone interface, the second end of the switch tube is connected with the signal detection end, and the third end of the switch tube is connected between the voltage output end and the first end of the second resistor.
2. The headset insertion detection circuit of claim 1, further comprising a third resistor connected between a headset insertion detection pin of the headset interface and the first end of the switch tube.
3. The headset insertion detection circuit of claim 1 further comprising a fourth resistor, a first end of the fourth resistor being connected between the signal detection terminal and the second end of the switching tube, a second end of the fourth resistor being connected to ground.
4. The headset insertion detection circuit of claim 1 further comprising a fifth resistor coupled between the signal detection terminal and the second terminal of the switching tube.
5. The headset insertion detection circuit of claim 1 wherein the first channel pin of the headset interface is a right channel pin.
6. The earphone insertion detection circuit according to any one of claims 1 to 5, wherein the switch tube is a P-channel MOS tube, the first end of the switch tube is a gate of the P-channel MOS tube, the second end of the switch tube is a drain of the P-channel MOS tube, and the third end of the switch tube is a source of the P-channel MOS tube.
7. An earphone isolation circuit, comprising a first channel signal input terminal, a second channel signal input terminal, a first channel isolation circuit, a second channel isolation circuit, and an earphone insertion detection circuit as claimed in any one of claims 1 to 6; wherein,
the input end of the first sound channel isolation circuit is connected with the first sound channel signal input end, and the output end of the first sound channel isolation circuit is connected with a first sound channel pin of the earphone interface;
the input end of the second sound channel isolation circuit is connected with the signal input end of the second sound channel, and the output end of the second sound channel isolation circuit is connected with the pin of the second sound channel of the earphone interface.
8. The headphone isolation circuit of claim 7, wherein the first channel isolation circuit comprises a first transformer, the first transformer comprising a first primary winding and a first secondary winding; wherein,
the first end of the first primary winding is connected with the first sound channel signal input end, and the second end of the first primary winding is grounded; the first end of the first secondary winding is connected with a first sound channel pin of the earphone interface, and the second end of the first secondary winding is grounded.
9. The headphone isolation circuit of claim 7, wherein the second channel isolation circuit comprises a second transformer, the second transformer comprising a second primary winding and a second secondary winding; wherein,
the first end of the second primary winding is connected with the second channel signal input end, and the second end of the second primary winding is grounded; and the first end of the second secondary winding is connected with a second channel pin of the earphone interface, and the second end of the second secondary winding is grounded.
10. An electronic device, comprising a main control circuit and the earphone isolation circuit of any one of claims 7 to 9; the master control circuit is connected with the signal detection end of the earphone isolation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821485141.7U CN208971820U (en) | 2018-09-11 | 2018-09-11 | Earphone insertion detection circuit, earphone isolation circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821485141.7U CN208971820U (en) | 2018-09-11 | 2018-09-11 | Earphone insertion detection circuit, earphone isolation circuit and electronic equipment |
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| CN208971820U true CN208971820U (en) | 2019-06-11 |
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| CN201821485141.7U Active CN208971820U (en) | 2018-09-11 | 2018-09-11 | Earphone insertion detection circuit, earphone isolation circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638865A (en) * | 2020-05-30 | 2020-09-08 | 深圳市亿道数码技术有限公司 | Hardware-controlled loudspeaker detection circuit and loudspeaker |
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2018
- 2018-09-11 CN CN201821485141.7U patent/CN208971820U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638865A (en) * | 2020-05-30 | 2020-09-08 | 深圳市亿道数码技术有限公司 | Hardware-controlled loudspeaker detection circuit and loudspeaker |
| CN111638865B (en) * | 2020-05-30 | 2023-10-24 | 深圳市亿道数码技术有限公司 | Hardware-controlled loudspeaker detection circuit and loudspeaker |
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