CN207720118U - Data transmission circuit and device - Google Patents
Data transmission circuit and device Download PDFInfo
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- CN207720118U CN207720118U CN201721659289.3U CN201721659289U CN207720118U CN 207720118 U CN207720118 U CN 207720118U CN 201721659289 U CN201721659289 U CN 201721659289U CN 207720118 U CN207720118 U CN 207720118U
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Abstract
A kind of data transmission circuit of the utility model offer and device, in the data transmission circuit, the first end of the primary coil of transformer is respectively connected to the first end of the first end and the first capacitance of current limliting module, the second end of current limliting module and the second end of the first capacitance are connected to the first power supply interface, the second end of the primary coil of transformer is connected to the input terminal of switch module, the first end of the secondary coil of transformer is connected to the second power supply interface, and the second end of the secondary coil of transformer is connected to the first pin of transmission interface；The output end of switch module is grounded, and the control terminal of switch module is connected to main control chip；Main control chip, for when data transmission circuit is to transmission interface transmission data signal, control signal to be sent to the control terminal of switch module；Switch module, the circuit pathways for when receiving the control signal of main control chip transmission, being switched on or switched off between the input terminal of switch module and output end.
Description
Technical field
The utility model is related to a kind of electronic technology field more particularly to a kind of data transmission circuits and device.
Background technology
Currently, in the implementation distance signal transmission when, position residing for data sending device present position and data sink
It is usually separated by a distance between setting, data transmission circuit and data receiver circuit design it is whether suitable, it will influence signal
The stability and quality of transmission.
Utility model content
The utility model is intended to provide a kind of novel data transmission circuit and device, it is ensured that signal transmission it is steady
Qualitative and quality.
The main purpose of the utility model is to provide a kind of data transmission circuits.
The another object of the utility model is to provide a kind of data sending device.
The another object of the utility model is to provide a kind of data transmission device.
Following technical scheme that in order to achieve the above object, the utility model provides：
Scheme 1, a kind of data transmission circuit, including：For providing the first power supply interface of the first DC voltage, for carrying
For the second power supply interface of the second DC voltage, transmission interface, main control chip, transformer, current limliting module, the first capacitance and switch
Module, transmission interface include the first pin and second pin；The first end of the primary coil of the transformer is respectively connected to institute
State the first end of the first end and first capacitance of current limliting module, the second end of the current limliting module and first capacitance
Second end is connected to first power supply interface, and the second end of the primary coil of the transformer is connected to the switch module
Input terminal, the first end of the secondary coil of the transformer is connected to second power supply interface, the secondary of the transformer
The second end of coil is connected to the first pin of the transmission interface, the second pin ground connection of the transmission interface；The switch
The output end of module is grounded, and the control terminal of the switch module is connected to the main control chip；The main control chip, in institute
When stating data transmission circuit to the transmission interface transmission data signal, control letter is sent to the control terminal of the switch module
Number；The switch module, for when receiving the control signal that the main control chip is sent, being switched on or switched off described open
Close the circuit pathways between the input terminal and output end of module.
Scheme 2, the data transmission circuit according to scheme 1, the current limliting module includes first resistor, the switching molding
Block includes metal-oxide-semiconductor or triode.
Scheme 3, a kind of data sending device include the data transmission circuit as described in scheme 1 or 2.
Scheme 4, a kind of data transmission device include the data transmission circuit as described in scheme 1 or 2 and a kind of data receiver
Circuit；Wherein, the data receiver circuit includes：Receiving interface, the first division module, voltage reduction module, the second division module,
Two capacitances, filter module, comparator and main control chip；The receiving interface include the first pin and second pin, described first
The first end of division module and the first end of second capacitance are connected to the first pin of the receiving interface, the reception
The second pin of interface is grounded；The second end of first division module and the second end of second capacitance are connected to first
Common connection end, first common connection end are connected to the input terminal of the filter module, the output end of the filter module
It is connected to the negative input end of the comparator, the ground terminal ground connection of the filter module；First common connection end is also connected with
To the input terminal of the voltage reduction module；The output end of the voltage reduction module is connected to the second common connection end, and described second is common
Connecting pin is connected to the positive input terminal of the comparator；Second common connection end is additionally coupled to second division module
First end；The second end of second division module is grounded；The comparator, it is described for passing through in the data receiver circuit
When receiving interface receives data-signal, the size of the voltage of the positive input terminal and the voltage of the negative input end, with
And comparison result signal is exported to the main control chip by the output end of the comparator；The main control chip is connected to described
The output end of comparator, the comparison result signal that the output end for receiving the comparator exports.
Scheme 5, the data receiver circuit according to scheme 4, first division module includes second resistance, the drop
Die block includes diode, and second division module includes 3rd resistor.
Scheme 6, the data receiver circuit according to scheme 4, the filter module include：4th resistance and third electricity
Hold；The first end of 4th resistance is connected to the input terminal of the filter module, and the second end of the 4th resistance is connected to
The output end of the filter module；The first end of the third capacitance is connected to the output end of the filter module, the third
The second end of capacitance is connected to the ground terminal of the filter module.
Scheme 7, the device according to scheme 4, the transmission interface and the receiving interface are same interface.
Scheme 8, the device according to scheme 4, the transmission interface and the receiving interface are distinct interface.
Through the above technical solutions, using new types of data transmission circuit provided by the utility model, it is ensured that signal is sent out
Stability when sending and quality.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
The attached drawing used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art for, without creative efforts, can also be according to these attached drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of a kind of schematic diagram for data transmission circuit that the utility model embodiment provides；
Fig. 2 is a kind of another schematic diagram for data transmission circuit that the utility model embodiment provides；
Fig. 3 is a kind of a kind of schematic diagram for data receiver circuit that the utility model embodiment provides；
Fig. 4 is a kind of another schematic diagram for data receiver circuit that the utility model embodiment provides；
Fig. 5 is the data transmission circuit used in a kind of data transmission device that the utility model embodiment provides and data
A kind of schematic diagram of receiving circuit.
Specific implementation mode
With reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
The every other embodiment obtained, belongs to the scope of protection of the utility model.
The utility model embodiment is described in further detail below in conjunction with attached drawing.
The present embodiment provides a kind of data transmission circuits, as shown in Figure 1, including：
For providing the first power supply interface of the first DC voltage, being connect for providing the second power supply of the second DC voltage
Mouth, transmission interface, main control chip, transformer T1, current limliting module, the first capacitance C1 and switch module, the transmission interface include
First pin and second pin；
The first end (1 foot of T1) of the primary coil of the transformer T1 is respectively connected to the first end of the current limliting module
With the first end of the first capacitance C1, the second end of the second end of the current limliting module and the first capacitance C1 are connected to
The second end (2 feet of T1) of first power supply interface, the primary coil of the transformer T1 is connected to the switch module
The first end (3 feet of T1) of input terminal, the secondary coil of the transformer T1 is connected to second power supply interface, the transformation
The second end (4 feet of T1) of the secondary coil of device T1 is connected to the first pin of the transmission interface, and the of the transmission interface
Two pins are grounded；
The output end of the switch module is grounded GND, and the control terminal of the switch module is connected to the main control chip；
The main control chip is used for when the data transmission circuit is to the transmission interface transmission data signal, to institute
The control terminal for stating switch module sends control signal；
The switch module, it is described for when receiving the control signal that the main control chip is sent, being switched on or switched off
Circuit pathways between the input terminal and output end of switch module.
In data transmission circuit provided in this embodiment, when switch module disconnects input terminal and the output of the switch module
When circuit pathways between end, the primary coil no current of transformer passes through, and the signal that transmission interface is sent out at this time is first straight
Galvanic electricity presses corresponding signal, when switch module connects the circuit pathways between the input terminal and output end of the switch module,
The primary coil of transformer generates electric current, and then transformer to circuit pathways are formed between ground level in the primary coil of transformer
Secondary coil in also generate electric current, at this point, the signal that the secondary coil of transformer generates will be generated with the second DC voltage
Signal couple, formed different from the first DC voltage signal (this be different from the first DC voltage signal voltage value it is non-
Zero), main control chip sends corresponding control signal according to transmitted data, controls the closure or openness of switch module, in turn
Alternately the corresponding signal of the first DC voltage is sent out in transmission interface and different from the signal of the first DC voltage, that is, in number
When according to sending, transmission interface uses ac signal transmission data, for example, sending number using the corresponding signal of the first DC voltage
According to 1, using the signal transmission data 0 different from the first DC voltage；Or it is sent using the corresponding signal of the first DC voltage
Data 0, using the signal transmission data 1 different from the first DC voltage.New types of data transmission circuit provided in this embodiment, can
Stability and quality when ensureing that signal is sent.
In the present embodiment, since transmission interface replaces the corresponding signal of the first DC voltage sent out and is different from first directly
The equal non-zero of voltage value of the signal of galvanic electricity pressure, that is, the equal non-zero of voltage value of data-signal that transmission interface is sent out, with existing skill
It is compared in transmission data signal by the way that voltage value is pulled low to zero in art, on the one hand, can by the voltage signal sent
To realize the continued power to reception device, on the other hand, the efficiency of data transmission can be improved, reduce the consumption that data are sent
When.
When using data transmission circuit transmission data provided in this embodiment, sends pin for realizing data and be connected with
Second power supply interface, which can be VCC, it is, it is to be connected to power supply to send pin for realizing data
On line, to both realize the transmission powered while also achieving data to data sending terminal device on single line.
As a kind of optional realization method of the present embodiment, the signal that the secondary coil of transformer generates will be with the second direct current
The signal coupling that voltage generates, forms the signal different from the first DC voltage, can be formed higher than the first DC voltage
Signal can also be that demand can be accordingly arranged according to the difference of the application, herein not less than the signal of the first DC voltage
It is restricted.
As a kind of optional realization method of the present embodiment, the main control chip is sent out to the control terminal of the switch module
Send control signal；For example, a kind of letter in high level and low level can be maintained under default conditions, at the control terminal of switch module
Number, to maintain switch module to be in open state, circuit pathways disconnect at this time, when needing closure switch to connect circuit pathways
When, the control signal of transmission is another signal in high level and low level, and high level closure switch specifically may be used also
It is low level closure switch, the component type used when being realized according to switch module determines that this is not restricted.
As a kind of optional realization method of the present embodiment, above-mentioned data transmission circuit can be applied to middle Distance Transmission,
For example, a kind of illustrative application scenarios：Electronic equipment equipped with wireless card reader, the electronic equipment are sent equipped with above-mentioned data
Circuit, the scene separated by a distance for reading card image；It is, of course, also possible to applied in short range transmission, for example, electronics is set
Standby to be equipped with above-mentioned data transmission circuit and have two line communication interfaces, it is logical to cross two lines for this between two such electronic equipments
The scene that letter interface carries out data transmission.This is not restricted.
As a kind of optional realization method of the present embodiment, as shown in Fig. 2, first for providing the first DC voltage supplies
Electrical interface can be specifically the first power supply interface for being connected to DC power supply VCC；For providing the second DC voltage
Two power supply interfaces can be specifically the second power supply interface for being connected to chip operating voltage VDD.
As a kind of optional realization method of the present embodiment, voltage can be more than the second power supply interface at the first power supply interface
Locate voltage, the signal that will be sent amplification may be implemented, to realize the transmission of medium and long distance signal.For example, the first power supply interface
Place's voltage is 12v, and voltage is 5v at the second power supply interface.Certainly, according to the needs of practical application, voltage at the first power supply interface
Voltage at the second power supply interface can also be equal to or less than.
As a kind of optional realization method of the present embodiment, another schematic diagram of data transmission circuit as shown in Figure 2.
The current limliting module includes first resistor R1, for playing current-limiting protection when circuit forms access, avoids the effect of short circuit.It should
May include a resistance or multiple parallel resistances or multiple series resistances, this is not restricted when first resistor is realized.
As a kind of optional realization method of the present embodiment, another schematic diagram of data transmission circuit as shown in Figure 2.
The switch module includes metal-oxide-semiconductor Q1 or triode.For example, when switch module uses NMOS tube, the drain D pole of the NMOS tube is made
For the input terminal of the switch module, the output end of the source S pole of the NMOS tube as the switch module, the grid of the NMOS tube
Control terminal of the pole poles G as the switch module；For another example, when switch module uses PMOS tube, the source S pole conduct of the PMOS tube
The input terminal of the switch module, the output end of the drain D pole of the NMOS tube as the switch module, the grid of the NMOS tube
Control terminal of the poles G as the switch module；For another example, the switch module other can also be may be implemented open using triode etc.
The component for closing function, does not limit herein.
As a kind of optional realization method of the present embodiment, in the first end and second end of the primary coil of the transformer
Between be also associated with burr filtering module, such as diode, the burr signal for being generated in filtering circuit.Certainly, in circuit
When middle current signal stable, which can not also be set.
As a kind of optional realization method of the present embodiment, in the first end and second end of the secondary coil of the transformer
Between be connected with filter module, for example, inductance, resistance, diode or inductance, resistance and diode these three components are simultaneously
Connection etc..Burr signal for being generated in filtering circuit.Certainly, in circuit current signal stable when, this can not also be set
Burr filtering module.
The present embodiment also provides a kind of data sending device, including above-mentioned data transmission circuit shown in fig. 1 or fig. 2.It should
Data sending device can be information read device, such as card reader, the electronics that need to read information from electric signing tools are set
Standby (such as PC machine, mobile phone).
The present embodiment also provides a kind of data transmission device, including above-mentioned data transmission circuit shown in fig. 1 or fig. 2 and
Data receiver circuit shown in following Fig. 3 or 4.The data transmission device, for example, it may be mutually matched card reader and intelligence
Card, can be host computer (such as PC machine, mobile phone etc.) and electric signing tools.
The present embodiment also provides a kind of data receiver circuit, as shown in figure 3, including：Receiving interface, the first division module,
Voltage reduction module, the second division module, the second capacitance C2, filter module, comparator A1 and main control chip, receiving interface include first
Pin and second pin；
The first end of first division module and the first end of the second capacitance C2 are connected to the receiving interface
The first pin, the receiving interface second pin ground connection；
The second end of first division module and the second end of the second capacitance C2 are connected to the first common connection
End, first common connection end are connected to the input terminal of the filter module, and the output end of the filter module is connected to institute
The negative input end of comparator A1 is stated, the ground terminal of the filter module is grounded GND；
First common connection end is additionally coupled to the input terminal of the voltage reduction module；
The output end of the voltage reduction module is connected to the second common connection end, and second common connection end is connected to described
The positive input terminal of comparator A1；
Second common connection end is additionally coupled to the first end of second division module；
The second end of second division module is grounded GND；
The comparator A1, for when the data receiver circuit receives data-signal by the receiving interface,
Compare the size of the voltage of the positive input terminal and the voltage of the negative input end, and the output end by the comparator A1
Comparison result signal is exported to the main control chip；
The main control chip is connected to the output end of the comparator A1, and the output end for receiving the comparator A1 is defeated
The comparison result signal gone out.
Data receiver circuit provided in this embodiment compares when the signal that receiving interface receives is ac signal
What the positive input terminal of device received is also ac signal, and the negative input end of comparator is due to being equipped with filter module, can be to exchange
Electric signal is filtered to obtain direct current signal, thus, the negative input end of comparator will receive direct current signal.It is just defeated when comparator
When entering the voltage of AC signal that termination receives and being more than the negative input end of comparator and receive the voltage of direct current signal, comparator is defeated
The comparison result signal gone out is high level, when the voltage for the AC signal that the positive input terminal of comparator receives is less than comparator
When negative input end receives the voltage of direct current signal, the comparison result signal of comparator output is low level, to realize data
The reception of signal.New types of data receiving circuit provided in this embodiment, it is ensured that stability and quality when signal receives.
As a kind of optional realization method of the present embodiment, as shown in figure 4, first division module includes second resistance
R2, the voltage reduction module include diode Q2, and second division module includes 3rd resistor R3.Data provided in this embodiment
Receiving circuit can be incited somebody to action when receiving interface receives signal by the first division module, voltage reduction module and the second division module
The voltage of the signal received drops in the voltage range of comparator support, and then ensures that comparator can be normally carried out and compare,
To export comparison result signal.
As a kind of optional realization method of the present embodiment, as shown in figure 4, the filter module includes：4th resistance R4
With third capacitance C3；The first end of the 4th resistance R4 is connected to the input terminal of the filter module, the 4th resistance R4
Second end be connected to the output end of the filter module；The first end of the third capacitance C3 is connected to the filter module
The second end of output end, the third capacitance C3 is connected to the ground terminal of the filter module.In the present embodiment, the filter module
More smooth DC signal can will be obtained after ac signal rectifying and wave-filtering.
As a kind of optional realization method of the present embodiment, as shown in figure 4, in the positive input terminal of the comparator A1 and defeated
Outlet is also associated with anti-shaking module, which includes resistance R6, certainly, flat in circuit for preventing circuit from shaking
Under the premise of steady, which can not also use setting.
As a kind of optional realization method of the present embodiment, transmission interface and receiving interface are same interface, wherein described
First pin of transmission interface and the first pin of the receiving interface are same pin, the second pin of the transmission interface and
The second pin of the receiving interface is same pin, for example, the data used in data transmission device as shown in Figure 5 are sent
In circuit and data receiver circuit, transmission interface and receiving interface realize that the coffret includes by the coffret in Fig. 5
First pin and second pin, wherein the first pin connects for sending or receiving data-signal, second pin ground connection, the transmission
Mouthful the first pin for realizing the first pin of transmission interface and the first pin of receiving interface function, the coffret
Second pin is filled for realizing the function of the second pin of transmission interface and the second pin of receiving interface by the data transmission
Set can be in both threads pin on realize that data send and receive.
Meanwhile in the device using data transmission circuit provided in this embodiment and data receiver circuit, for realizing
The pin of data transmission and reception is connected with the second power supply interface, which can be VCC, it is, for real
The pin of existing data transmission and reception is to connect on the power line, to both realize power supply on single line while also achieve
Data send and receive.
Certainly, the transmission interface and the receiving interface may be distinct interface, be carried out with specific reference to application demand
Setting.
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 spy described in conjunction with this embodiment or example
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 can be combined in any suitable manner in any one or more embodiments or example.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are not departing from the utility model
Principle and objective in the case of above-described embodiment can be changed in the scope of the utility model, change, replace and
Modification.The scope of the utility model is by appended scheme and its equivalent limits.
Claims (8)
1. a kind of data transmission circuit, which is characterized in that including：For providing the first power supply interface of the first DC voltage, using
In provide the second power supply interface of the second DC voltage, transmission interface, main control chip, transformer, current limliting module, the first capacitance and
Switch module, the transmission interface include the first pin and second pin；
The first end of the primary coil of the transformer is respectively connected to the first end of the current limliting module and first capacitance
First end, the second end of the second end of the current limliting module and first capacitance is connected to first power supply interface,
The second end of the primary coil of the transformer is connected to the input terminal of the switch module, the secondary coil of the transformer
First end is connected to second power supply interface, and the second end of the secondary coil of the transformer is connected to the transmission interface
First pin, the second pin ground connection of the transmission interface；
The output end of the switch module is grounded, and the control terminal of the switch module is connected to the main control chip；
The main control chip, for when the data transmission circuit is to the transmission interface transmission data signal, being opened to described
The control terminal for closing module sends control signal；
The switch module, it is described for when receiving the control signal that the main control chip is sent, being switched on or switched off
Circuit pathways between the input terminal and output end of switch module.
2. data transmission circuit according to claim 1, which is characterized in that the current limliting module includes first resistor, institute
It includes metal-oxide-semiconductor or triode to state switch module.
3. a kind of data sending device, which is characterized in that including data transmission circuit as claimed in claim 1 or 2.
4. a kind of data transmission device, which is characterized in that including data transmission circuit as claimed in claim 1 or 2 and one kind
Data receiver circuit；
Wherein, the data receiver circuit includes：Receiving interface, the first division module, voltage reduction module, the second division module,
Two capacitances, filter module, comparator and main control chip, the receiving interface include the first pin and second pin；
The first end of first division module and the first end of second capacitance are connected to the first of the receiving interface
Pin, the second pin ground connection of the receiving interface；
The second end of first division module and the second end of second capacitance are connected to the first common connection end, described
First common connection end is connected to the input terminal of the filter module, and the output end of the filter module is connected to the comparator
Negative input end, the filter module ground terminal ground connection；
First common connection end is additionally coupled to the input terminal of the voltage reduction module；
The output end of the voltage reduction module is connected to the second common connection end, and second common connection end is connected to the comparison
The positive input terminal of device；
Second common connection end is additionally coupled to the first end of second division module；
The second end of second division module is grounded；
The comparator, for when the data receiver circuit receives data-signal by the receiving interface, comparing institute
The size of the voltage of positive input terminal and the voltage of the negative input end is stated, and is compared by the output end output of the comparator
Consequential signal is to the main control chip；
The main control chip is connected to the output end of the comparator, the comparison that the output end for receiving the comparator exports
Consequential signal.
5. device according to claim 4, which is characterized in that first division module includes second resistance, the drop
Die block includes diode, and second division module includes 3rd resistor.
6. device according to claim 4, which is characterized in that the filter module includes：4th resistance and third capacitance；
The first end of 4th resistance is connected to the input terminal of the filter module, and the second end of the 4th resistance is connected to
The output end of the filter module；
The first end of the third capacitance is connected to the output end of the filter module, and the second end of the third capacitance is connected to
The ground terminal of the filter module.
7. device according to claim 4, which is characterized in that the transmission interface and the receiving interface connect to be same
Mouthful, wherein the first pin of the transmission interface and the first pin of the receiving interface are same pin, the transmission interface
Second pin and the receiving interface second pin be same pin.
8. device according to claim 4, which is characterized in that the transmission interface and the receiving interface connect for difference
Mouthful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721659289.3U CN207720118U (en) | 2017-12-01 | 2017-12-01 | Data transmission circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721659289.3U CN207720118U (en) | 2017-12-01 | 2017-12-01 | Data transmission circuit and device |
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| Publication Number | Publication Date |
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| CN207720118U true CN207720118U (en) | 2018-08-10 |
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| CN201721659289.3U Active CN207720118U (en) | 2017-12-01 | 2017-12-01 | Data transmission circuit and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019105338A1 (en) * | 2017-12-01 | 2019-06-06 | 天地融科技股份有限公司 | Data transmitting circuit and apparatus, and data receiving circuit and apparatus |
-
2017
- 2017-12-01 CN CN201721659289.3U patent/CN207720118U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019105338A1 (en) * | 2017-12-01 | 2019-06-06 | 天地融科技股份有限公司 | Data transmitting circuit and apparatus, and data receiving circuit and apparatus |
| US11043982B1 (en) | 2017-12-01 | 2021-06-22 | Tendyron Corporation | Data transmitting circuit, data receiving circuit and data transferring apparatus |
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