CN102111143A - Digital signal input circuit - Google Patents
Digital signal input circuit Download PDFInfo
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- CN102111143A CN102111143A CN2010105724482A CN201010572448A CN102111143A CN 102111143 A CN102111143 A CN 102111143A CN 2010105724482 A CN2010105724482 A CN 2010105724482A CN 201010572448 A CN201010572448 A CN 201010572448A CN 102111143 A CN102111143 A CN 102111143A
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- resistor
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- digital signal
- switch unit
- optical coupler
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
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- General Physics & Mathematics (AREA)
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Abstract
The invention provides a digital signal input circuit. The digital signal input circuit of the invention comprises: a first current limiting unit which limits the current of an input signal; a first switching unit which is connected to an output terminal of the first current limiting unit in the positive direction; an optical coupler which is connected between the first switching unit and a grounding in the positive direction and optically couples the signal from the first switching unit to the output terminal; a second current limiting unit which limits the current of an input signal from an input connector; a second switching unit which is connected to an output terminal of the second current limiting unit in the opposite direction; and a second optical coupler which is connected between the second switching unit and the grounding in the opposite direction and optically couples the signal from the second switching unit to the output terminal.
Description
The cross reference of related application
The application requires the priority in the korean patent application No.10-2009-0131105 of submission on December 24th, 2009 in Korea S Department of Intellectual Property, and its content is incorporated in this by reference.
Technical field
The present invention relates to the digital signal input circuit, this digital signal input circuit can be applicable to the warning device such as the electronic equipment of alarm lamp, and more specifically, relate to by the digital signal input circuit being applied to when being switched on the output positive voltage P common type (P-common type) product and when being switched on the N common type product of output negative voltage, can receive and have negative (-) and the digital signal input circuit of the signal of (+) voltage just.
Background technology
Usually, there is two types alarm lamp: P common type alarm lamp and N common type alarm lamp.About P common type alarm lamp, when the lamp conducting, export just (+) voltage.On the other hand, about N common type alarm lamp, negative (-) voltage of output when lamp is switched on.
Because output has the voltage of two varying levels, so these alarm lamps are applied to using the radio data communication equipment of IEEE 802.15.4MAC.In order to import two types signal, that is, P common type and N common type signal need provide separately circuit according to P common type and N common type.
Therefore, in the middle of binary data communication, when using an input circuit, be merely able to input and have the just signal of (+) voltage, and can not import signal with negative (-) voltage.On the other hand, the signal with negative (-) voltage can be input to input circuit, have the just signal of (+) voltage and can not import.
Summary of the invention
Aspect of the present invention provides a kind of digital signal input circuit, this digital signal input circuit is by being applied to the digital signal input circuit at the P common type product of conducting time output positive voltage and the N common type product of output negative voltage during in conducting, can receiving have the just signal of (+) voltage and negative (-) voltage.
According to aspects of the present invention, provide a kind of digital signal input circuit, this digital signal input circuit comprises: first current limiting unit, and this first current limiting unit restriction comes from the electric current of the input signal of input connector; First switch unit, this first switch unit are connected to the lead-out terminal of first current limiting unit and according to the voltage of signals level that comes from first current limiting unit and conducting or end on direction; First optical coupler, this first optical coupler is coupled to lead-out terminal optically at the signal that is connected between first switch unit and the ground connection on the direction and will come from first switch unit; Second current limiting unit, this second current limiting unit restriction comes from the electric current of the input signal of input connector; Second switch unit, this second switch unit are connected to the lead-out terminal of second current limiting unit and according to the voltage of signals level that comes from second current limiting unit and conducting or end on inverse direction; And second optical coupler, this second optical coupler is coupled to lead-out terminal optically at the signal that is connected between second switch unit and the ground connection on the inverse direction and will come from second switch unit.
First current limiting unit can comprise first resistor, this first resistor has an end that is connected to input connector and the other end that is connected to first switch unit, and first resistor can have predetermined resistance, makes the electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal be limited to the current range that first optical coupler allows.
First switch unit can comprise: second resistor, this second resistor have an end of the other end that is connected to first resistor and are connected to the other end of ground connection; With first diode, this first diode has the anode of an end that is connected to second resistor and is connected to the negative electrode of first optical coupler.
First optical coupler can comprise: first light-emitting diode, this first light-emitting diode have the anode of the negative electrode that is connected to first diode and are connected to the negative electrode of ground connection; With first light receiving transistor, this first light receiving transistor has the base stage that the collector electrode that is connected to power supply voltage terminal, the emitter that is connected to lead-out terminal and reception come from the light of first light-emitting diode.
The second current limiting unit volume can comprise the 3rd resistor, the 3rd resistor has an end that is connected to input connector and the other end that is connected to second switch unit, and the 3rd resistor has predetermined resistance, makes the electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal be limited to the current range that second optical coupler allows.
Second switch unit can comprise: the 4th resistor, the 4th resistor have an end of the other end that is connected to the 3rd resistor and are connected to the other end of ground connection; With second diode, this second diode has the negative electrode of an end that is connected to the 4th resistor and is connected to the anode of second optical coupler.
Second optical coupler can comprise: second light-emitting diode, this second light-emitting diode have the negative electrode of the anode that is connected to second diode and are connected to the anode of ground connection; With second light receiving transistor, this second light receiving transistor has the base stage that the collector electrode that is connected to power supply voltage terminal, the emitter that is connected to lead-out terminal and reception come from the light of second light-emitting diode.
The digital signal input circuit may further include the electrostatic protection unit, and this electrostatic protection unit is connected between input connector and the ground connection and makes by the static of input connector to ground connection and detours.
First resistor can have predetermined resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal is limited to the scope from about 1mA to 10mA.
When the voltage of input signal be in from approximately+5V is to the scope of+24V the time, first resistor can have the resistance of about 2.4k Ω, makes electric current be limited to the scope from about 1mA to 10mA.
The 3rd resistor can have predetermined resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal is restricted to the scope from about 1mA to 10mA.
The 3rd resistor can have the resistance of about 2.4k Ω, make voltage when input signal be in from approximately-5V extremely-scope of 24V in the time, electric current is restricted to the scope from about 1mA to 10mA.
Description of drawings
Understand above and other aspect of the present invention, feature and other advantage in conjunction with the accompanying drawings according to the following detailed description with will be more readily apparent from, wherein:
Fig. 1 is the block diagram that illustrates according to the digital signal input circuit of exemplary embodiment of the present invention; With
Fig. 2 is the example view that illustrates according to the predetermined resistance of first resistor R 11 of the first current limiting unit inside of exemplary embodiment of the present invention.
Embodiment
Will describe exemplary embodiment of the present invention with reference to the accompanying drawings in detail now.
Yet the present invention can implement and should not be understood that to be limited to embodiment set forth herein with many different forms.But, these embodiment are provided, make that the disclosure will be comprehensive and complete, and will fully pass on scope of the present invention to those skilled in the art.In the accompanying drawings, for clear, can exaggerate shape and size, and will use identical Reference numeral to specify identical or similar assembly.
Fig. 1 is the block diagram that illustrates according to the digital signal input circuit of exemplary embodiment of the present invention.
With reference to figure 1, comprise first current limiting unit 110, first switch unit 120, first optical coupler 130, second current limiting unit 210, second switch unit 220 and second optical coupler 230 according to the digital signal input circuit of present embodiment.The electric current of the input signal of first current limiting unit, 110 restricted passage input connector INC.First switch unit 120 is connected to the lead-out terminal of first current limiting unit 110 on direction, and according to the voltage of signals level that comes from first current limiting unit 110 and conducting or end.First optical coupler 130 is coupled to lead-out terminal OUT optically at the signal that is connected between first switch unit 120 and the ground connection on the direction and will come from first switch unit 120.210 restrictions of second current limiting unit come from the electric current of the input signal of input connector INC.Second switch unit 220 is connected to the lead-out terminal of second current limiting unit 210 on inverse direction, and according to the voltage of signals level that comes from second current limiting unit 210 and conducting or end.Second optical coupler 230 is connected to second switch unit 220 and ground connection and will comes from second switch unit 220 on inverse direction signal is coupled to lead-out terminal OUT optically.
First current limiting unit 110 comprises first resistor R 11, and this first resistor R 11 has an end that is connected to input connector INC and the other end that is connected to first switch unit 120.First resistor R 11 has predetermined resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is limited to the current range that first optical coupler 130 allows.
First optical coupler 130 can comprise the first light-emitting diode D1, and this first light-emitting diode D1 has the anode of the negative electrode that is connected to the first diode D11 and is connected to the negative electrode of ground connection; With the first light receiving transistor Q1, this first light receiving transistor Q1 has the base stage that the collector electrode that is connected to supply voltage VCC terminal, the emitter that is connected to lead-out terminal OUT and reception come from the light of the first light-emitting diode D1.
In addition, second current limiting unit 210 comprises that the 3rd resistor R 21, the three resistor R 21 have an end that is connected to input connector INC and the other end that is connected to second switch unit 220.Here, the 3rd resistor R 21 has predetermined resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is limited to the current range that second optical coupler 230 allows.
Second optical coupler 230 can comprise the second light-emitting diode D2, and this second light-emitting diode D2 has the negative electrode of the anode that is connected to the second diode D21 and is connected to the anode of ground connection; With the second light receiving transistor Q2, this second light receiving transistor Q2 has the base stage that the collector electrode that is connected to supply voltage VCC terminal, the emitter that is connected to lead-out terminal OUT and reception come from the light of the second light-emitting diode D2.
, may further include electrostatic protection unit 50 according to the digital signal input circuit of present embodiment here, this electrostatic protection unit 50 is connected between input connector INC and the ground connection and makes by input connector INC and detours to the static of ground connection.Electrostatic protection unit 50 can comprise at least one in the known electrostatic protection device, and known electrostatic protection device comprises general-purpose diode, Zener diode, static absorber or the like.
Fig. 2 is the example view that illustrates according to the predetermined resistance of first resistor R 11 of first current limiting unit, 110 inside of exemplary embodiment of the present invention.
With reference to figure 1 and Fig. 2, first resistor R 11 can have resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is limited to the scope between about 1mA and the 10mA.Particularly, for example, when the voltage Vin of input signal be in from approximately+5V is to the scope of+24V the time, first resistor R 11 can be set to the predetermined resistance of about 2.4k Ω, makes electric current be restricted to the scope from about 1mA to 10mA.
With reference to figure 1 and Fig. 2, the 3rd resistor R 21 can have predetermined resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is restricted to the scope from about 1mA to 10mA.Particularly, for example, when the voltage Vin of input signal be in from approximately-5V is to the scope of-24V the time, the 3rd resistor R 21 can be set to the predetermined resistance of about 2.4k Ω, makes electric current be restricted to the scope from about 1mA to 10mA.
Hereinafter, will describe operation of the present invention and effect with reference to the accompanying drawings in detail.
With reference to figure 1 and Fig. 2, the signal that has the signal of (+) voltage just or have negative (-) voltage can be imported into the input connector INC of digital signal input circuit.
In example,, has the just signal of (+) voltage by input connector INC input when the digital signal input circuit is connected to when being switched on output just during the P common type product of (+) voltage.Via first current limiting unit 110, first switch unit 120 and first optical coupler 130 this input signal is transferred to lead-out terminal OUT in a sequential manner.
In another example, when the N common type product of (-) voltage is born in output when the digital signal input circuit is connected in conducting, have the signal of negative (-) voltage by input connector INC input, and via second current limiting unit 210, second switch unit 220 and second optical coupler 230 this input signal is transferred to lead-out terminal OUT in a sequential manner.
Here, when electrostatic protection unit 50 was provided to input connector INC, electrostatic protection unit 50 can stop the static that moment has high level voltage and imports by input connector INC.
At first, when having the signal of (+) voltage just by input connector INC input, this input signal is transferred to first switch unit 120 via first current limiting unit 110.
Here, though input signal passes through first current limiting unit 110, the electric current of input signal is restricted to the current range that first optical coupler 130 allows.
More specifically, the resistance that first resistor R 11 of first current limiting unit 110 can be set to be scheduled to, the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is restricted to the current range that first optical coupler 130 allows.
For example, as shown in fig. 1, when first switch unit 120 comprised second resistor R 12 and the first diode D11, the current conversion that will come from first current limiting unit 110 by second resistor R 12 was a voltage.When being applied in voltage to the anode of the first diode D11, by the voltage turn-on first diode D11 from current conversion greater than conducting voltage.
Here, first optical coupler 130 is connected to first switch unit 120 and the ground connection on direction, and the signal that will come from first switch unit 120 is coupled to lead-out terminal OUT optically, makes to have the just signal of (+) voltage by lead-out terminal OUT output.
Particularly, when 130 receptions of first optical coupler come from the signal of first switch unit 120, produce light from the first light-emitting diode D1 that is connected in direction between the first diode D11 and the ground connection.Thereby receive the light conducting first light receiving transistor Q1 of this generation at the base stage place of the first light receiving transistor Q1.The first light receiving transistor Q1 is by lead-out terminal OUT output supply voltage VCC.
As application, when Zigbee IC was connected to lead-out terminal according to the digital signal input circuit of exemplary embodiment of the present invention, the digital signal input circuit can the signal of (+) voltage be input to Zigbee IC with just having.
Then, when having the signal of negative (-) voltage by input connector INC input, this input signal is transferred to second switch unit 220 by second current limiting unit 210.
Here, when input signal during through second current limiting unit 210, the electric current of input signal is limited to the current range that second optical coupler 230 allows.
More specifically, the resistance that the 3rd resistor R 21 of second current limiting unit 210 can be set to be scheduled to, the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is restricted to the current range that second optical coupler 230 allows.
For example, as shown in fig. 1, when second switch unit 220 comprised the 4th resistor R 22 and the second diode D21, the current conversion that will come from second current limiting unit 210 by the 4th resistor R 22 was a voltage.When being applied in voltage to the anode of the second diode D21, by the voltage turn-on second diode D21 from current conversion greater than conducting voltage.
Here, second optical coupler 230 is connected to second switch unit 220 and the ground connection on inverse direction, and coupling comes from the signal of second switch unit 220 optically, makes the signal that has negative (-) voltage by lead-out terminal OUT output.
Particularly, when 230 receptions of second optical coupler come from the signal of second switch unit 220, produce light from the second light-emitting diode D2 that is connected in inverse direction between the second diode D21 and the ground connection.Thereby receive the light conducting second light receiving transistor Q2 of this generation at the base stage place of the second light receiving transistor Q2, make the second light receiving transistor Q2 by lead-out terminal OUT output supply voltage VCC.
As application, when Zigbee IC was connected to lead-out terminal according to the digital signal input circuit of exemplary embodiment of the present invention, the digital signal input circuit can be input to Zigbee IC with the signal with negative (-) voltage.
With reference to figure 1 and Fig. 2, the electric current of crossing the first diode D11 for control flows makes electric current drop in the permissible range, first resistor R 11 can have predetermined resistance, and the feasible input current Iin that determines according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is limited to the scope of 1mA to 10mA.For example, when the voltage Vin of input signal be in approximately+5V is in the scope of+24V the time, first resistor R 11 can be set to the predetermined resistance of about 2.4k Ω, makes input current Iin be limited to the scope of about 1mA to 10mA.
In practical embodiments, VCC is set to 3.3V at supply voltage, and first resistor R 11 is set under the situation of 2.4k Ω, when input voltage is 24V, 12V and 5V, the electric current that flows through the first diode D11 is respectively 8mA, 3mA and 1mA, and the voltage of exporting by lead-out terminal OUT is respectively 3.30V, 3.28V and 3.26V.
In addition, with reference to figure 1 and Fig. 2, the electric current of crossing the second diode D21 for control flows makes electric current be in the permissible range, the 3rd resistor R 21 can have predetermined resistance, and the feasible input current Iin that determines according to the ratio of voltage and resistance with respect to the voltage Vin of input signal is limited to the scope of 1mA to 10mA.Particularly, for example, when the voltage Vin of input signal be in approximately-5V is in the scope of-24V the time, the 3rd resistor R 21 can be set to the predetermined resistance of about 2.4k Ω, makes input current Iin be limited to the scope of about 1mA to 10mA.
In practical embodiments, VCC is set to 3.3V at supply voltage, and the 3rd resistor R 21 is set under the situation of 2.4k Ω, when input voltage be-5V ,-12V and-during 24V, the electric current that flows through the second diode D21 is respectively 1mA, 4mA and 9mA, and the voltage of exporting by lead-out terminal OUT is respectively 3.26V, 3.28V and 3.30V.
The N common type product that output has the P common type product of the signal of (+) voltage just and output has the signal of negative (-) voltage when conducting when being applied in conducting according to the digital signal input circuit with above-mentioned structure of exemplary embodiment of the present invention makes the digital signal input circuit can receive the signal of positive and negative voltage.
Though illustrated and described the present invention in conjunction with exemplary embodiment, to one skilled in the art clearly, under the situation that does not have to break away from the spirit and scope of the present invention that limit as the claim of enclosing, can make amendment and change.
Claims (12)
1. digital signal input circuit comprises:
First current limiting unit, described first current limiting unit restriction comes from the electric current of the input signal of input connector;
First switch unit, described first switch unit are connected to the lead-out terminal of described first current limiting unit and according to the voltage of signals level that comes from described first current limiting unit and conducting or end on direction;
First optical coupler, described first optical coupler is coupled to lead-out terminal optically at the signal that is connected between described first switch unit and the ground connection on the direction and will come from described first switch unit;
Second current limiting unit, described second current limiting unit restriction comes from the electric current of the input signal of described input connector;
Second switch unit, described second switch unit are connected to the lead-out terminal of described second current limiting unit and according to the voltage of signals level that comes from described second current limiting unit and conducting or end on inverse direction; And
Second optical coupler, described second optical coupler is coupled to described lead-out terminal optically at the signal that is connected between described second switch unit and the described ground connection on the inverse direction and will come from described second switch unit.
2. digital signal input circuit according to claim 1, wherein said first current limiting unit comprises first resistor, described first resistor has an end that is connected to described input connector and the other end that is connected to described first switch unit, and
Described first resistor has predetermined resistance, makes the electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal be limited to the current range that described first optical coupler allows.
3. digital signal input circuit according to claim 2, wherein said first switch unit comprises:
Second resistor, described second resistor have an end of the other end that is connected to described first resistor and are connected to the other end of described ground connection; With
First diode, described first diode have the anode of an end that is connected to described second resistor and are connected to the negative electrode of described first optical coupler.
4. digital signal input circuit according to claim 3, wherein said first optical coupler comprises:
First light-emitting diode, described first light-emitting diode have the anode of the negative electrode that is connected to described first diode and are connected to the negative electrode of described ground connection; With
First light receiving transistor, described first light receiving transistor has the base stage that the collector electrode that is connected to power supply voltage terminal, the emitter that is connected to described lead-out terminal and reception come from the light of described first light-emitting diode.
5. digital signal input circuit according to claim 1, wherein said second current limiting unit comprises the 3rd resistor, described the 3rd resistor has an end that is connected to described input connector and the other end that is connected to described second switch unit, and
Described the 3rd resistor has predetermined resistance, makes the electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal be limited to the current range that described second optical coupler allows.
6. digital signal input circuit according to claim 5, wherein said second switch unit comprises:
The 4th resistor, described the 4th resistor have an end of the other end that is connected to described the 3rd resistor and are connected to the other end of described ground connection; With
Second diode, described second diode have the negative electrode of an end that is connected to described the 4th resistor and are connected to the anode of described second optical coupler.
7. digital signal input circuit according to claim 6, wherein said second optical coupler comprises:
Second light-emitting diode, described second light-emitting diode have the negative electrode of the anode that is connected to described second diode and are connected to the anode of described ground connection; With
Second light receiving transistor, described second light receiving transistor has the base stage that the collector electrode that is connected to power supply voltage terminal, the emitter that is connected to described lead-out terminal and reception come from the light of described second light-emitting diode.
8. digital signal input circuit according to claim 1 further comprises the electrostatic protection unit, and described electrostatic protection unit is connected between described input connector and the described ground connection and makes by the static of described input connector to described ground connection and detours.
9. digital signal input circuit according to claim 2, wherein said first resistor has predetermined resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal is limited to the scope from about 1mA to 10mA.
10. digital signal input circuit according to claim 9, wherein when the voltage of described input signal be in from approximately+5V is to the scope of+24V the time, described first resistor has the resistance of about 2.4k Ω, makes electric current be limited to the scope from about 1mA to 10mA.
11. digital signal input circuit according to claim 5, wherein said the 3rd resistor has predetermined resistance, and the feasible electric current of determining according to the ratio of voltage and resistance with respect to the voltage of input signal is restricted to the scope from about 1mA to 10mA.
12. digital signal input circuit according to claim 11, wherein when the voltage of described input signal be in from approximately-5V is to the scope of-24V the time, described the 3rd resistor has the resistance of about 2.4k Ω, makes electric current be restricted to the scope from about 1mA to 10mA.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020090131105A KR20110074202A (en) | 2009-12-24 | 2009-12-24 | Digital signal input circuit |
| KR10-2009-0131105 | 2009-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102111143A true CN102111143A (en) | 2011-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105724482A Pending CN102111143A (en) | 2009-12-24 | 2010-11-30 | Digital signal input circuit |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20110074202A (en) |
| CN (1) | CN102111143A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639265A (en) * | 2019-01-14 | 2019-04-16 | 浙江源创建筑智能科技有限公司 | A kind of universal input circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101872797B1 (en) | 2017-05-18 | 2018-06-29 | 두산중공업 주식회사 | Digital signal output device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960021820A (en) * | 1994-12-22 | 1996-07-18 | 석진철 | Digital Input Signal Processing Circuit for Electric Vehicles |
| JP2001267906A (en) * | 2000-03-15 | 2001-09-28 | Nissan Motor Co Ltd | Signal input circuit and signal input and output device |
| KR200306492Y1 (en) * | 2002-12-12 | 2003-03-08 | 주식회사 지오네트 | Digital input line disconnection check circuit |
-
2009
- 2009-12-24 KR KR1020090131105A patent/KR20110074202A/en not_active Application Discontinuation
-
2010
- 2010-11-30 CN CN2010105724482A patent/CN102111143A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960021820A (en) * | 1994-12-22 | 1996-07-18 | 석진철 | Digital Input Signal Processing Circuit for Electric Vehicles |
| JP2001267906A (en) * | 2000-03-15 | 2001-09-28 | Nissan Motor Co Ltd | Signal input circuit and signal input and output device |
| KR200306492Y1 (en) * | 2002-12-12 | 2003-03-08 | 주식회사 지오네트 | Digital input line disconnection check circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639265A (en) * | 2019-01-14 | 2019-04-16 | 浙江源创建筑智能科技有限公司 | A kind of universal input circuit |
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| Publication number | Publication date |
|---|---|
| KR20110074202A (en) | 2011-06-30 |
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Application publication date: 20110629 |