CN211909136U - Automatic switching circuit with audio power amplifier output and electronic equipment thereof - Google Patents
Automatic switching circuit with audio power amplifier output and electronic equipment thereof Download PDFInfo
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- CN211909136U CN211909136U CN202020504142.2U CN202020504142U CN211909136U CN 211909136 U CN211909136 U CN 211909136U CN 202020504142 U CN202020504142 U CN 202020504142U CN 211909136 U CN211909136 U CN 211909136U
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Abstract
The utility model discloses an automatic switching circuit with audio power amplifier output and an electronic device thereof, which are used for an embedded PC product, and the utility model comprises a channel switch, an earphone detection unit and a power amplifier unit; the input end of the channel switch is connected with an audio interface of the embedded PC product; the output end of the channel switch comprises a first channel and a second channel; the input end of the earphone detection unit is connected with the first channel, and the earphone detection unit is used for connecting an earphone; the input end of the power amplification unit is connected with the second channel, and the output end of the power amplification unit is connected with a loudspeaker S1. The utility model discloses only improve the circuit part, can adapt to and carry out audio output through the speaker for embedded PC is basic platform's electronic equipment, improves work efficiency when making things convenient for the staff to use this type of equipment. The circuit is improved without adopting a special chip or integrating a switching function on an audio device, so that the automatic switching of audio output is realized, and the production and manufacturing cost is low.
Description
Technical Field
The utility model relates to an audio power amplifier switches technical field, and more specifically says, relates to an automatic switch-over circuit and electronic equipment with audio power amplifier output.
Background
Most consumer electronic products in life are provided with an earphone and a loudspeaker interface at the same time, so that the earphone or the loudspeaker can be used for audio output, and when the products require to be inserted into the earphone, the loudspeaker is immediately disconnected and the insertion of the earphone is prompted; when the earphone is pulled out, the loudspeaker is switched to output audio, and the earphone is prompted to be pulled out.
At present, switching between earphones and speakers is often realized by a dedicated chip or a switching function is integrated on an audio device. However, some electronic devices based on an embedded PC are often capable of using only an earphone as an audio output, and according to actual working and living needs, such devices are also required to have a function of outputting audio through a speaker, and can realize automatic switching between the speaker and the earphone.
At present, for solving earphone and speaker automatic switch-over problem, the utility model patent with the publication number of CN208540119U discloses a circuit of automatic recognition earphone plug, including power, first resistance, earphone socket, second resistance, relay, singlechip, the output of power is connected with first resistance, the other end of first resistance is connected with earphone socket, be connected with the second resistance on the earphone socket, second resistance ground connection, still be connected with the relay on the earphone socket, the relay with the output of singlechip is connected, the input of singlechip is connected on the wire between first resistance and earphone socket. The earphone socket is internally provided with a spring piece, the spring piece comprises an upper spring piece and a lower spring piece, the upper spring piece is connected to a power supply through a first resistor, and the lower spring piece is connected to the ground through a second resistor. The technical scheme solves the problem of switching between the earphone and the loudspeaker, but the technical scheme cannot prompt a user whether the circuit is switched, and on the other hand, the audio output power of the electronic equipment taking the embedded PC as a basic platform is lower, and the technical scheme cannot be suitable for equipment with lower audio output power.
Disclosure of Invention
1. Technical problem to be solved by the invention
To current electronic equipment who uses embedded PC as basic platform, can not carry out the problem of speaker output to the audio frequency, the utility model provides an automatic switch-over circuit and electronic equipment with audio power amplifier output, the utility model discloses need not to adopt special chip or integrate the switching function on the audio frequency device, realized the automatic switch-over of earphone and speaker audio output promptly, production low in manufacturing cost.
2. Technical scheme
The utility model discloses an automatic switching circuit with audio power amplifier output, which is used for embedded PC products and comprises a channel switch, an earphone detection unit and a power amplifier unit;
the input end of the channel switch is connected with an audio interface of the embedded PC product;
the output end of the channel switch comprises a first channel and a second channel;
the input end of the earphone detection unit is connected with the first channel, and the earphone detection unit is used for connecting an earphone;
the input end of the power amplification unit is connected with the second channel, and the output end of the power amplification unit is connected with a loudspeaker S1.
Preferably, the channel switch is a relay K1, the first channel is a normally open contact NO of a relay K1, and the second channel is a normally closed contact NC of a relay K1.
Preferably, the earphone detection unit comprises an earphone socket J1 and a detection circuit; the detection circuit is connected to the first channel and the earphone jack J1, respectively.
Preferably, the detection circuit comprises a resistor R1, a resistor R2, a field effect transistor Q1, a coil KM1 and a contact switch ab;
one end of the resistor R1 is connected with a power supply VCC, the other end of the resistor R1 is connected with one end of a contact switch ab, the other end of the contact switch is connected with one end of a resistor R2, and the other end of the resistor R2 is grounded; one end of the resistor R2 connected with the contact switch ab is connected with a normally open contact NO of the relay switch K1;
the resistor R1 is connected with one end of the contact switch ab and is respectively connected with the grid of the field effect transistor Q1 and the IO interface of the embedded PC;
the source electrode of the field effect transistor Q1 is grounded, and the drain electrode of the field effect transistor Q1 is connected with a power supply VCC through a coil KM 1.
Preferably, the power amplifier unit comprises an audio input end, an audio output end and a parameter control end;
the audio input end is connected with the second channel, the audio output end is connected with the loudspeaker S1, and the parameter control end is connected with an IO interface of the embedded PC.
The utility model discloses still include an electronic equipment, this equipment is for using embedded PC to be the electronic equipment of basic platform, and this equipment includes foretell arbitrary one an automatic switch-over circuit with audio power amplifier output.
3. Advantageous effects
Adopt the utility model provides a technical scheme compares with existing well-known technique, has following beneficial effect:
(1) the utility model discloses a technical scheme only improve the circuit part, can be adapted to carry out audio output through the speaker for embedded PC is basic platform's electronic equipment. The working efficiency is improved when workers use the equipment conveniently.
(2) The utility model discloses a technical scheme need not to adopt special chip or the integrated switching function on the audio frequency device, but through improving circuit itself, does not need software control, when also can realizing the earphone plug, inserts/extracts the detection information feedback with the earphone through control interface and gives equipment, realizes the automatic switch-over of earphone and speaker audio output, and manufacturing cost is low.
Drawings
Fig. 1 is a schematic diagram of an automatic switching circuit with audio power amplifier output according to the present invention;
FIG. 2 is a specific circuit diagram of the automatic switching circuit with audio power amplifier output according to the present invention;
fig. 3 is a schematic circuit diagram of the power amplifier unit of the present invention.
Detailed Description
Example 1
As shown in fig. 1, this embodiment aims to solve the problem that the existing embedded PC platform product cannot realize the functions of audio output automatic switching and audio power amplification according to actual needs, and provides an automatic switching circuit with audio power amplifier output, which includes a channel switch, an earphone detection unit and a power amplifier unit. The channel switch is a multi-channel switch, and has an input end and at least two output ends, the channel switch provided in this embodiment is an input end and two output ends, and the two output ends are a first channel and a second channel, respectively. The input end of the channel switch is connected with an audio interface VS of the embedded PC product. The first channel is connected with the input end of the earphone detection unit, the first channel can transmit the audio signal of the embedded PC product to the earphone detection unit, the earphone detection unit transmits the audio signal to the earphone, so that a user can hear audio content through the earphone, and meanwhile, the earphone detection unit is also connected with an IO (input/output) interface of the embedded PC product and used for driving the switching of a relay K1 switch and informing the audio output state of the embedded PC product. The second channel is connected with the input end of the power amplification unit, the output end of the power amplification unit is used for being connected with a loudspeaker S1, the second channel receives audio signals from the embedded PC product, and the audio signals are transmitted to a loudspeaker S1 and then played by the other side through a loudspeaker S1.
The working process of the embodiment is as follows: when the earphone detection unit detects an earphone signal, the first channel is conducted, the second channel is disconnected, at the moment, the audio signal in the first channel is an effective output signal, the second channel is an invalid signal, and the audio signal is transmitted to the outside through the first channel; when the single earphone detection unit does not detect the earphone signal, the first channel is disconnected, the second channel is connected, at the moment, the audio signal in the second channel is an effective output signal, the audio signal in the first channel is an invalid signal, and the audio signal is transmitted to the outside through the second channel.
Example 2
As shown in fig. 2, in this embodiment, the channel switch is a relay K1, an input end of the channel switch is a common contact COM of a relay K1, a first channel is a normally open contact NO of a relay K1, and a second channel is a normally closed contact NC of a relay K1. The earphone detection unit comprises an earphone socket and a detection circuit, the earphone socket is used for inserting or extracting an earphone, and the detection circuit is used for detecting and feeding back insertion and extraction signals of the earphone and feeding back the insertion and extraction signals to the embedded PC product.
The detection circuit comprises a resistor R1, a resistor R2, a field effect transistor Q1, a coil KM1 and a contact switch ab; one end of the resistor R1 is connected with a power supply VCC, the other end of the resistor R1 is connected with one end of the contact switch ab, the other end of the contact switch is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded; one end of the resistor R2 connected with the contact switch ab is connected with a normally open contact NO of the relay switch K1; the resistor R1 is connected with one end of the contact switch ab, and is simultaneously connected with the grid of the field effect transistor Q1 and the IO interface of the embedded PC; the source electrode of the field effect transistor Q1 is grounded, and the drain electrode of the field effect transistor Q1 is connected with a power supply VCC through a coil KM 1.
The technical scheme in the embodiment has the following working process and working principle:
the audio signal of the embedded PC product is connected with a common contact COM of a relay K1, and an NC contact of a relay K1 is connected with a power amplification unit and is input into a loudspeaker S1; the NO contact of the relay K1 is connected with the earphone detection unit, and voltage division is carried out in the earphone detection unit through resistors R1 and R2, wherein the resistor R1> > R2; detecting the insertion of the earphone by detecting the level state of a point a of a contact switch ab; when an earphone is not inserted in a normal state, a contact switch ab in the earphone socket is in a closed state, a point a and a point b of the contact switch are conducted, the level of the point a is low level, a field effect transistor Q1 is not conducted, a coil KM1 is not electrified, and a normally closed contact NC of a relay K1 is in a conducting state; when the earphone is plugged in, the contact switch ab in the earphone socket is in a disconnected state, the point a and the point b are disconnected, the level of the point a is high level, the field effect transistor Q1 is switched on, the coil KM1 is electrified, the normally open contact NO of the relay is in a switched-on state, and the audio output is switched to the output port of the earphone.
Example 3
As shown in fig. 3, the power amplifier unit in this embodiment includes an audio input terminal, an audio output terminal, and a parameter control terminal, where the audio input terminal is connected to the second channel, and receives an audio signal from the embedded PC product through the audio input terminal, the audio output terminal transmits the audio signal to the speaker S1, and the speaker performs sound output after receiving the audio signal. The parameter control end is connected with an IO interface of the embedded PC, has the functions of volume gain adjustment and volume closing, and is adjusted through the embedded PC.
Example 4
The present embodiment provides an electronic device, which includes any one of the automatic switching circuits with audio power amplifier output described in embodiments 1, 2, and 3.
Claims (6)
1. The utility model provides an automatic switch-over circuit with audio power amplifier output for embedded PC product, its characterized in that: the earphone comprises a channel switch, an earphone detection unit and a power amplification unit;
the input end of the channel switch is connected with an audio interface of the embedded PC product;
the output end of the channel switch comprises a first channel and a second channel;
the input end of the earphone detection unit is connected with the first channel, and the earphone detection unit is used for connecting an earphone;
the input end of the power amplification unit is connected with the second channel, and the output end of the power amplification unit is connected with a loudspeaker S1.
2. The automatic switching circuit with audio power amplifier output of claim 1, wherein: the channel switch is a relay K1, the first channel is a relay K1 normally open contact NO, and the second channel is a relay K1 normally closed contact NC.
3. The automatic switching circuit with audio power amplifier output of claim 1 or 2, characterized in that: the earphone detection unit comprises an earphone socket J1 and a detection circuit; the detection circuit is connected to the first channel and the earphone jack J1, respectively.
4. The automatic switching circuit with audio power amplifier output of claim 3, wherein: the detection circuit comprises a resistor R1, a resistor R2, a field effect transistor Q1, a coil KM1 and a contact switch ab;
one end of the resistor R1 is connected with a power supply VCC, the other end of the resistor R1 is connected with one end of a contact switch ab, the other end of the contact switch is connected with one end of a resistor R2, and the other end of the resistor R2 is grounded; one end of the resistor R2 connected with the contact switch ab is connected with a normally open contact NO of the relay switch K1;
the resistor R1 is connected with one end of the contact switch ab and is respectively connected with the grid of the field effect transistor Q1 and the IO interface of the embedded PC;
the source electrode of the field effect transistor Q1 is grounded, and the drain electrode of the field effect transistor Q1 is connected with a power supply VCC through a coil KM 1.
5. The automatic switching circuit with audio power amplifier output of claim 4, wherein: the power amplifier unit comprises an audio input end, an audio output end and a parameter control end;
the audio input end is connected with the second channel, the audio output end is connected with the loudspeaker S1, and the parameter control end is connected with an IO interface of the embedded PC.
6. An electronic device, characterized in that: the automatic output switching circuit with the audio power amplifier, which comprises any one of claims 1-5, is an electronic device with an embedded PC-based platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020504142.2U CN211909136U (en) | 2020-04-07 | 2020-04-07 | Automatic switching circuit with audio power amplifier output and electronic equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020504142.2U CN211909136U (en) | 2020-04-07 | 2020-04-07 | Automatic switching circuit with audio power amplifier output and electronic equipment thereof |
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| CN211909136U true CN211909136U (en) | 2020-11-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111615034A (en) * | 2020-05-14 | 2020-09-01 | 上海创功通讯技术有限公司 | Electronic equipment and audio playing method |
| CN114296538A (en) * | 2021-12-07 | 2022-04-08 | 广东虹勤通讯技术有限公司 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
-
2020
- 2020-04-07 CN CN202020504142.2U patent/CN211909136U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111615034A (en) * | 2020-05-14 | 2020-09-01 | 上海创功通讯技术有限公司 | Electronic equipment and audio playing method |
| CN114296538A (en) * | 2021-12-07 | 2022-04-08 | 广东虹勤通讯技术有限公司 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
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