CN207382285U - Signal detection circuit and electronic device - Google Patents
Signal detection circuit and electronic device Download PDFInfo
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- CN207382285U CN207382285U CN201721536710.1U CN201721536710U CN207382285U CN 207382285 U CN207382285 U CN 207382285U CN 201721536710 U CN201721536710 U CN 201721536710U CN 207382285 U CN207382285 U CN 207382285U
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- comparison circuit
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Abstract
The utility model discloses a signal detection circuit and electronic equipment, the signal detection circuit comprises a differential signal input end, a comparison circuit and a control chip which are electrically connected in sequence; the differential signal input end comprises a first signal input end and a second signal input end, and the first signal input end and the second signal input end are both connected with the comparison circuit; the comparison circuit is connected with the first working power supply and used for correspondingly generating a second level and transmitting the second level to the control chip when receiving the differential signal; the input end of the control chip is connected with the output end of the comparison circuit, and the control chip is used for determining that the electronic equipment has the input of the signal source after receiving the second level output by the comparison circuit. The utility model provides a signal detection circuit can in time judge effectively whether have the input of signal source in the electronic equipment, has satisfied the practical application demand.
Description
Technical field
The utility model is related to electronic circuit technology field, more particularly to a kind of signal deteching circuit and electronic equipment.
Background technology
As the improvement of people's living standards, the electronic product that function becomes increasingly abundant increasingly has been subject to, everybody is joyous
It meets, the great convenience brought to the life of user.
During the use of electronic product, often need to receive the relevant data signals transmitted by outer signals source.Such as
Vision signal, picture signal and audio auxiliary signal etc..Existing way is typically to open up signal in the one side of electronic equipment
Receiving port for receiving the data-signal transmitted by signal source, and then carries out data processing.Wherein, DP ports are a kind of
More common receiver port.
However, since existing DP ports do not have fixed voltage input pin or insertion detection pin, actually should
The insertion detection of equipment can not be carried out in namely can not be detected in time to determine whether that signal inputs, and be unfavorable for actual answer
With.
Utility model content
For this purpose, the purpose of this utility model is to solve existing DP ports due to no fixed voltage input pin
Or the problem of being inserted into detection pin, the insertion detection of equipment can not be carried out in practical applications.
The utility model proposes a kind of signal deteching circuit, for detecting in an electronic equipment whether have signal source input,
Wherein, the signal deteching circuit includes the differential signal input being electrically connected successively, comparison circuit and control chip；
The differential signal input includes the first signal input part and secondary signal input terminal, and first signal is defeated
Enter end and the secondary signal input terminal is connected with the comparison circuit, the differential signal input is used to receive
Differential signal be sent to the comparison circuit；
The comparison circuit is connected with the first working power, and the comparison circuit, which is used to work as, receives the differential signal
When, corresponding output level is switched to second electrical level by the first level, and the second electrical level is sent to the control core
Piece, wherein the voltage value of the second electrical level is higher than the voltage value of first level；
The input terminal of the control chip is connected with the output terminal of the comparison circuit, and the control chip is used for when reception
After the second electrical level exported to the comparison circuit, it is determined that have the input of the signal source in the electronic equipment.
The utility model proposes signal deteching circuit, the first signal input part and second in differential signal input
Differential signal is sent to comparison circuit by signal input part, due to when there is the insertion of signal source input equipment, comparing in comparison circuit
Input voltage compared with device input terminal can be overturn, therefore the comparator corresponds to the level exported and also cut by the first original level
Second electrical level is changed to, wherein the second electrical level is high level, and the first level is low level, defeated when chip is controlled to receive comparator
During the high level gone out, then may determine that in the electronic equipment at this time has input signal namely has signal source equipment insertion.This practicality
The signal deteching circuit of new proposition can timely and effectively judge the input for whether having signal source in electronic equipment, meet reality
Border application demand.
The signal deteching circuit, wherein, the comparison circuit be a comparator, the first end of the comparator with it is described
First signal input part connects, the second end of the comparator and the secondary signal input terminal, the 3rd end of the comparator
For the output terminal of the comparison circuit.
The signal deteching circuit, wherein, one end of the comparator is connected with first working power, the comparison
Device at least one end is grounded.
The signal deteching circuit, wherein, the signal deteching circuit further includes a filter circuit, the filter circuit
One end is connected with first signal input part, and the other end is connected with the secondary signal input terminal.
The signal deteching circuit, wherein, the filter circuit includes the first filter capacitor and the second filter capacitor, institute
The one end for stating the first filter capacitor is connected with first signal input part, other end ground connection；The one of second filter capacitor
End is connected with the secondary signal input terminal, other end ground connection.
The signal deteching circuit, wherein, the signal deteching circuit further includes a resistance circuit, the resistance circuit
One end is connected with the second working power, and the other end is connected with the output terminal of the comparison circuit.
The signal deteching circuit, wherein, the resistance circuit includes first resistor, one end of the first resistor and institute
The connection of the second working power is stated, the other end is connected with the 3rd end of the comparator.
The signal deteching circuit, wherein, the signal deteching circuit further includes a bleeder circuit, the bleeder circuit
One end is connected with the 3rd end of the comparator, and the other end is connected with the input terminal of the control chip.
The signal deteching circuit, wherein, the bleeder circuit include the first capacitance, the second capacitance, second resistance and
3rd resistor, one end of first capacitance are connected with the 3rd end of the comparator, other end ground connection；The second resistance
Respectively with first capacitance and second capacitance connection, one end of second capacitance is grounded at both ends；3rd electricity
One end of resistance is connected with one end of second capacitance, other end ground connection.
The utility model also proposes a kind of electronic equipment, and one is equipped on the electronic equipment for receiving connecing for signal source
Receiving end mouth, wherein, signal deteching circuit as described above is equipped at the receiving port of the electronic equipment.
The additional aspect and advantage of the utility model will be set forth in part in the description, partly will be from following description
In become apparent or recognized by the practice of the utility model.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination accompanying drawings below to embodiment
Become apparent and be readily appreciated that, wherein：
Fig. 1 is the structure diagram of the signal deteching circuit in the utility model first embodiment；
Fig. 2 is the structure diagram of the signal deteching circuit in the utility model second embodiment；
The circuit theory schematic diagram that Fig. 3 overturns for level in signal source equipment in the prior art；
Fig. 4 is the structure diagram of the signal deteching circuit in the utility model 3rd embodiment；
Fig. 5 is the schematic enlarged-scale view of comparison circuit in signal deteching circuit shown in Fig. 4；
Fig. 6 is the schematic enlarged-scale view of filter circuit in signal deteching circuit shown in Fig. 4；
Fig. 7 is the schematic enlarged-scale view of bleeder circuit in signal deteching circuit shown in Fig. 4.
Specific embodiment
To enable the above-mentioned purpose of the utility model, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings to this
The specific embodiment of utility model is described in detail.Several embodiments of the utility model are given in attached drawing.But this
Utility model can be realized in many different forms, however it is not limited to embodiment described herein.On the contrary, provide these
The purpose of embodiment is the disclosure more thorough and comprehensive made to the utility model.
It should be noted that when element is referred to as " being fixedly arranged on " another element, it can be directly on another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side ", " on ", " under " and similar statement for illustrative purposes only rather than instruction or imply signified device or member
Part must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the utility model.Term as used herein " and/or " include one or more relevant Listed Items
Arbitrary and all combination.
During the use of electronic product, often need to receive the relevant data signals transmitted by outer signals source.Such as
Vision signal, picture signal and audio auxiliary signal etc..Existing way is typically to open up signal in the one side of electronic equipment
Receiving port for receiving the data-signal transmitted by signal source, and then carries out data processing.Wherein, DP ports are a kind of
More common receiver port.However, existing DP ports do not have fixed voltage input pin or insertion detection to draw
Foot can not carry out the insertion detection of equipment namely can not detect in time to determine whether that signal inputs, be in practical applications
This is solved the problems, such as, the utility model proposes a kind of signal deteching circuit, referring to Fig. 1, the utility model first embodiment
In signal deteching circuit, for convenience of description, only shown and the relevant part of the utility model embodiment.
A kind of signal deteching circuit, for detecting in an electronic equipment whether have signal source input, wherein, the signal inspection
Slowdown monitoring circuit includes the differential signal input 10 being electrically connected successively, comparison circuit 11 and control chip 12；
Wherein, differential signal input 10 includes the first signal input part 101 and secondary signal input terminal 102.First
The input terminal of signal input part 101 and secondary signal input terminal 102 with comparison circuit 11 is connected, differential signal input 10
For the differential signal received to be sent to the comparison circuit 11；
Comparison circuit 11 is connected with the first working power 110, which is used to carry for the comparison circuit 11
For operating voltage.In practical applications, when not receiving the differential signal, which corresponds to the first electricity of output
It is flat；When receiving the differential signal, which corresponds to output second electrical level, wherein the voltage of the second electrical level
Value is higher than the voltage value of first level；
The input terminal of control chip 12 is connected with the output terminal of comparison circuit 11, is received wherein control chip 12 is used to work as
After the second electrical level that comparison circuit 11 exports, it is determined that have the input of signal source in the electronic equipment namely determine the electricity
There is the insertion of signal source input equipment in sub- equipment.
The utility model proposes signal deteching circuit, the first signal input part and second in differential signal input
Differential signal is sent to comparison circuit by signal input part, due to when there is the insertion of signal source input equipment, comparing in comparison circuit
Input voltage compared with device input terminal can be overturn, therefore the comparator corresponds to the level exported and also cut by the first original level
Second electrical level is changed to, wherein the second electrical level is high level, and the first level is low level, defeated when chip is controlled to receive comparator
During the high level gone out, then may determine that in the electronic equipment at this time has input signal namely has signal source equipment insertion.This practicality
The signal deteching circuit of new proposition can timely and effectively judge the input for whether having signal source in electronic equipment, meet reality
Border application demand.
Referring to Fig. 2, for the signal deteching circuit in second embodiment, it is similary to include the difference being electrically connected successively letter
Number input terminal 10, comparison circuit 11 and control chip 12.Unlike above-mentioned first embodiment, the signal in the present embodiment
Detection circuit further includes filter circuit 13, resistance circuit 14 and bleeder circuit 15.
Wherein, one end of the filter circuit 13 is connected with first signal input part 101, the other end and described second
Signal input part 102 connects.The filter circuit 13 is mainly used for carrying out signal filtering process to the differential signal received, with drop
The noise of low differential signal improves the quality of received signal.
One end of the resistance circuit 14 is connected with the second working power 140, the output terminal of the other end and comparison circuit 11
Connection.Wherein, second working power 140 be mainly used for for should resistance circuit 14 normal work.Due in practical application
In, the current value in main line there may come a time when it is less than normal, will be unable at this time realize to control chip 12 driving operation.In order to solve this
One problem, there is provided the resistance circuits 14, can be in addition main line provides an electric current, to ensure that the current value in main line is enough
Greatly, so that it is guaranteed that control chip 12 can smoothly be driven.
In addition, one end of the bleeder circuit 15 is connected with the 3rd end 113 of the comparator, the other end and the control
The input terminal connection of chip 12.The bleeder circuit 15 in practical applications, not only plays an important role of partial pressure, but also can also be to electricity
Signal is further filtered.
Below by with a specific embodiment come to the utility model proposes signal deteching circuit operation principle into
Row elaborates.First, with reference to attached drawing 3 to existing signal source equipment detect signal source input when, level is overturn
Principle be illustrated.When inputting when signal wire is pulled out namely without signal source, depositing due to divider resistance R1 at this time
Corresponding voltage is generally 2.5~3.3V at 1b positions, corresponding at 2b positions at this time due to the presence of pull down resistor R2
Voltage is 0V；When plugging signal wire namely having signal source input, since the partial pressure of R1 acts on, corresponded at this time at 1b positions
Voltage 300mv or so can be dropped to by 2.5~3.3V, can be acted at 2b positions due to the partial pressure of R4, voltage is risen to by 0V
2.2~3V.In this way, 1b is overturn with corresponding voltage at 2b positions.
Fig. 4 to Fig. 7 is referred to, for the signal deteching circuit in 3rd embodiment, including the difference being electrically connected successively
Signal input part 10, comparison circuit 11 and control chip (CPU) 12.
Wherein, differential signal input 10 includes the first signal input part 101 (AUXDCN) and secondary signal input terminal
102(AUXDCP).First signal input part 101 (AUXDCN) is connected with the first end 111 of comparator, secondary signal input terminal
102 (AUXDCP) are connected with the second end 112 of comparator.One end of comparator is connected with the first working power 110, first work
Make power supply 110 and provide operating voltage for comparator.In addition, one end ground connection of comparator, to eliminate electrostatic interference.
The first above-mentioned signal input part 101 and secondary signal input terminal 102 are connected with a filter circuit 13,
The filter circuit 13 includes the first filter capacitor 131 and the second filter capacitor 132, the first filter capacitor 131
One end is connected with the first signal input part 101, other end ground connection；One end of second filter capacitor 132 and secondary signal input terminal
102 connections, other end ground connection.The filter circuit 13 is mainly used for carrying out signal filtering process to the differential signal received, with
The noise of differential signal is reduced, improves the quality of received signal.
A resistance circuit 14 is connected at the 3rd end 113 of comparator, which includes first resistor 141.Its
In, one end of the first resistor 141 is connected with the second working power 140, and the 3rd end 113 of the other end and comparator connects.It should
Resistance circuit 14 is mainly used for improving the current value in main line, to ensure to control chip (CPU) 12 that can smoothly be driven.
In addition, being equipped with a bleeder circuit 15 between resistance circuit 14 and control chip 12, which includes the
One capacitance 151, the second capacitance 153, second resistance 152 and 3rd resistor 154.Wherein, one end of first capacitance 151 with than
The 3rd end 113 compared with device connects, other end ground connection；The both ends of second resistance 152 respectively with the first capacitance 151 and the second capacitance
153 connections, one end ground connection of the second capacitance 153；One end of 3rd resistor 154 is connected with one end of the second capacitance 153, the other end
Ground connection.The bleeder circuit 15 in practical applications, not only plays an important role of partial pressure, but also electric signal further can also be carried out
Filtering process.
In practical applications, when have signal source input equipment insertion when, at this time the first signal input part 101 (AUXDCN) with
And secondary signal input terminal 102 (AUXDCP) can receive a differential signal.Such as (audio is auxiliary for AUX signals for the differential signal
Help signal), wherein the AUX signals are divided into N-terminal and P ends.Due to having divider resistance and pull-up inside signal source input equipment
Resistance when signal source input equipment is inserted into, at this time can be overturn between the N-terminal of AUX signals and P ends namely comparator
Input signal between first end 111 and second end 112 can be overturn.
It should be understood that before not overturning namely when signal source input equipment is not inserted into, the comparator exports at this time
Level be the first level (low level)；When the input signal between the first end 111 of comparator and second end 112 is overturn
Afterwards, the level of comparator output at this time is second electrical level (high level).When control chip (CPU) 12 receives comparator transmission
High level after, can determine the signal input port of the electronic equipment at this time has signal source input namely has signal source input
Equipment is inserted into.
The utility model also proposes a kind of electronic equipment, and one is equipped on the electronic equipment for receiving connecing for signal source
Receiving end mouth, wherein, signal deteching circuit as described above is equipped at the receiving port of the electronic equipment.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It is combined in an appropriate manner in any one or more embodiments or example.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of signal deteching circuit, for detecting in an electronic equipment whether have signal source input, which is characterized in that the letter
Number detection circuit includes the differential signal input being electrically connected successively, comparison circuit and control chip；
The differential signal input includes the first signal input part and secondary signal input terminal, first signal input part
And the secondary signal input terminal is connected with the comparison circuit, the differential signal input is used for the difference that will be received
Sub-signal is sent to the comparison circuit；
The comparison circuit is connected with the first working power, and the comparison circuit is used for when receiving the differential signal, will
Corresponding output level is switched to second electrical level by the first level, and the second electrical level is sent to the control chip,
Described in second electrical level voltage value be higher than first level voltage value；
The input terminal of the control chip is connected with the output terminal of the comparison circuit, and the control chip, which is used to work as, receives institute
After the second electrical level for stating comparison circuit output, it is determined that have the input of the signal source in the electronic equipment.
2. signal deteching circuit according to claim 1, which is characterized in that the comparison circuit is a comparator, described
The first end of comparator is connected with first signal input part, and the second end of the comparator is inputted with the secondary signal
End, the 3rd end of the comparator are the output terminal of the comparison circuit.
3. signal deteching circuit according to claim 2, which is characterized in that one end of the comparator and first work
Make power supply connection, the comparator at least one end is grounded.
4. signal deteching circuit according to claim 2, which is characterized in that the signal deteching circuit further includes a filtering
Circuit, one end of the filter circuit are connected with first signal input part, and the other end connects with the secondary signal input terminal
It connects.
5. signal deteching circuit according to claim 4, which is characterized in that the filter circuit includes the first filter capacitor
And second filter capacitor, one end of first filter capacitor are connected with first signal input part, other end ground connection；Institute
The one end for stating the second filter capacitor is connected with the secondary signal input terminal, other end ground connection.
6. signal deteching circuit according to claim 2, which is characterized in that the signal deteching circuit further includes a resistance
Circuit, one end of the resistance circuit are connected with the second working power, and the other end is connected with the output terminal of the comparison circuit.
7. signal deteching circuit according to claim 6, which is characterized in that the resistance circuit includes first resistor, institute
The one end for stating first resistor is connected with second working power, and the other end is connected with the 3rd end of the comparator.
8. signal deteching circuit according to claim 2, which is characterized in that the signal deteching circuit further includes a partial pressure
Circuit, one end of the bleeder circuit are connected with the 3rd end of the comparator, the input terminal of the other end and the control chip
Connection.
9. signal deteching circuit according to claim 8, which is characterized in that the bleeder circuit includes the first capacitance, the
Two capacitances, second resistance and 3rd resistor, one end of first capacitance are connected with the 3rd end of the comparator, the other end
Ground connection；The both ends of the second resistance respectively with first capacitance and second capacitance connection, second capacitance
One end is grounded；One end of the 3rd resistor is connected with one end of second capacitance, other end ground connection.
10. a kind of electronic equipment is equipped with one for receiving the receiving port of signal source on the electronic equipment, feature exists
In equipped with the signal detection electricity as described in 1 to 9 any one of the claims at the receiving port of the electronic equipment
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721536710.1U CN207382285U (en) | 2017-11-16 | 2017-11-16 | Signal detection circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721536710.1U CN207382285U (en) | 2017-11-16 | 2017-11-16 | Signal detection circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207382285U true CN207382285U (en) | 2018-05-18 |
Family
ID=62333253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721536710.1U Active CN207382285U (en) | 2017-11-16 | 2017-11-16 | Signal detection circuit and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207382285U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262589A (en) * | 2019-05-23 | 2019-09-20 | 南京牧镭激光科技有限公司 | A kind of TEC temperature control driving circuit and its control strategy |
| CN112838836A (en) * | 2021-02-20 | 2021-05-25 | 上海数明半导体有限公司 | Differential demodulation circuit and receiver circuit |
-
2017
- 2017-11-16 CN CN201721536710.1U patent/CN207382285U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262589A (en) * | 2019-05-23 | 2019-09-20 | 南京牧镭激光科技有限公司 | A kind of TEC temperature control driving circuit and its control strategy |
| CN110262589B (en) * | 2019-05-23 | 2020-11-10 | 南京牧镭激光科技有限公司 | TEC temperature control driving circuit and control strategy thereof |
| CN112838836A (en) * | 2021-02-20 | 2021-05-25 | 上海数明半导体有限公司 | Differential demodulation circuit and receiver circuit |
| CN112838836B (en) * | 2021-02-20 | 2025-02-25 | 上海数明半导体有限公司 | Differential demodulation circuit and receiving circuit |
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