CN103378847B - Binary input circuit - Google Patents
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- CN103378847B CN103378847B CN201210123018.1A CN201210123018A CN103378847B CN 103378847 B CN103378847 B CN 103378847B CN 201210123018 A CN201210123018 A CN 201210123018A CN 103378847 B CN103378847 B CN 103378847B
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Abstract
The present invention proposes the input circuit of a kind of binary.This input circuit includes: decision circuitry, is coupled to the input of described input circuit, for exporting an active voltage when input voltage is higher than a predetermined threshold；Linear voltage regulator, it is configured to constant pressure source, and the output of described decision circuitry is coupled in its input, and exports a driving voltage when described decision circuitry is output as active voltage；Electrically insulating element, the output of described linear voltage regulator is coupled in its input, and the outfan of this input circuit is coupled in its output；Wherein, when the output of described linear voltage regulator is not up to described driving voltage, described electric isolution element exports the first logic level；When described linear voltage regulator is output as described driving voltage, the output of described electric isolution element is switched to the second logic level from the first logic level.
Description
Technical field
This patent disclosure relates generally to input circuit, particularly relate to a kind of input for providing binary input to micro-control unit
Circuit.
Background technology
During industrial automatic control, usually first with detecting devices detection collection site data, then by senior micro-
The data gathered are analyzed by reason device or microcontroller, control relevant device finally according to analysis result and perform corresponding dynamic
Make.This process can be applied in various automation control systems.To fill with the digital relay protection in power system below
It is set to example and describes this process.
Fig. 1 schematically illustrates the structured flowchart of Digital Relay Protection Appliance.As it is shown in figure 1, protective relaying device is usual
Enter including A/D sample circuit 110, binary system input (BI:Binary Input) circuit 120, microprocessor 130, two
System output (BO:Binary Output) circuit 140, communication unit 150, man-machine interface (HMI:Human Machine
Interface) 160 and power module 170.In actual applications, in order to detect the every phase of each section in power system
(phase) voltage and current of electricity, A/D sample circuit 110 generally includes substantial amounts of current transformer (CT:Current
Transformer), voltage transformer (PT:Potential Transformer) and analog-digital converter (ADC:Analogue
To Digital Converter), the voltage and current data needed for gathering.The data collected based on A/D sample circuit 110,
Microprocessor 130 calculates the parameters of power system, such as electric current, voltage, phase sequence, power etc., and utilizes
Relevant protection algorism judges whether occur in that fault in power system.Once find that fault, microprocessor 130 will be led to
Cross BO circuit 140 or other operating unit relative breaker in power system sends trip signal.Take off in response to this
Button signal, relative breaker performs corresponding trip operation, and utilizes its operation mechanism deenergization to connect.So, so that it may
With rapid disengagement failure circuit, and keep other parts of power system properly functioning.
In above process, protective relaying device is in addition to utilizing A/D to use circuit 110 to monitor, gathering analog quantity, also
The state of each external relay in BI circuit 120 electric power monitoring system to be utilized, such as, the state of chopper (disconnect,
Guan Bi or dropout) and the state (connecting or disjunction) of disconnecting switch (Switch disconnector).Each BI passage
Require connect to the auxiliary contact of the contact of an external relay, such as chopper.So, by detection BI passage
Input voltage just can identify the logic state of the contact being attached thereto.Such as, if the input voltage of BI passage is higher than
One predetermined threshold, then show the logic state for example, " 1 " of contact, represents and connects.Otherwise, the logic shape of this contact
State for example, " 0 ", represents disjunction.
But, in actual power system, these external relay may be powered with different rated voltages, such as direct current
Voltage 24V, 48V, 60V, 110V, 125V, 220V or 250V, or such as alternating voltage 115V or 230V.
This just requires the voltage input that each BI passage of BI circuit is able to receive that under different rated voltage, and correspondingly configures not
Same threshold voltage.Such as, if certain external relay is with 110V direct current supply, then for the input voltage of logical one
For, its threshold voltage should be direct current 88V.If another external relay is with 220V direct current supply, then its logical one
Threshold voltage should be direct current 176V.Therefore, BI circuit needs a BI that can mate neatly with on-the-spot actual demand
Passage.
Disclosed in 5 days January in 2005, Chinese patent application No.200410014252.6 discloses a kind of DC voltage
On-off signal condition judgment module.This On-off signal condition judgment module utilizes Zener diode to carry out input voltage
Threshold decision, and utilize audion for serving as the operating current that the optocoupler electrically insulating element provides constant.Specifically, input is worked as
Voltage less than threshold value time, audion by, the optocoupler connected with the colelctor electrode of audion does not works, and module is output as high level.
Otherwise, when input voltage is higher than threshold value, triode ON, optocoupler works, and module is output as low level.This judge module
Because using audion to do switch element, module needs for multiple units such as the corresponding biasing resistor of triode arrangement, current-limiting resistances
Part.
Summary of the invention
It is an object of the present invention to propose a kind of novel binary system input circuit, its simple in construction and have good steady
Qualitative and concordance.Further object is that a kind of novel binary system input circuit of proposition, it can be neatly
The binary system input quantity powered from different rated voltages matches.
According to one aspect of the invention, the present invention proposes the input circuit of a kind of binary, it is characterised in that: this input
Circuit includes: input, is used for receiving input voltage；Outfan, for output the first logic level or the second logic level；
Decision circuitry, is coupled to described input, for exporting an active voltage when described input voltage is higher than a predetermined threshold；
Linear voltage regulator, it is configured to constant pressure source, and the output of described decision circuitry is coupled in its input, and in described decision circuitry
It is output as during active voltage exporting a driving voltage；Electrically insulating element, the output of described linear voltage regulator is coupled in its input,
Described outfan is coupled in its output；Wherein, when the output of described linear voltage regulator is not up to described driving voltage, described
Electric isolution element exports the first logic level；When described linear voltage regulator is output as described driving voltage, described electric isolution
The output of element is switched to the second logic level from the first logic level.Wherein, described electric isolution element is preferably optocoupler.
Preferably, described linear voltage regulator at least includes: manostat input K, output end of voltage stabilizer A and Voltage Feedback
End VREF.Wherein, described pressure feedback port is for receiving the output voltage V of described output end of voltage stabilizer AASampled value,
A constant described driving voltage Vd is exported with the described output end of voltage stabilizer A of control.It is further preferable that linear voltage regulator leads to
Cross series connection bleeder circuit and be configured to constant pressure source.This series connection bleeder circuit is coupled to described output end of voltage stabilizer A, and described voltage
Feedback end VREFIt is connected to the dividing point of described series connection bleeder circuit, the size of divider resistance in wherein said series connection bleeder circuit
Determine the size of the driving voltage Vd of described output end of voltage stabilizer A output.
Thus, compared with existing binary system input circuit, what the present invention proposed utilizes linear voltage regulator, and by linear voltage stabilization
Device is configured to constant pressure source and drives the design of such as optocoupler, and simple in construction, component number are few, low cost.It is additionally, since line
Property manostat has current-limiting function, thus the input circuit being so designed that has good stability and concordance.Additionally, by
Need not electric capacity be filtered in linear voltage regulator being configured to constant pressure source, thus the rise time is minimized.Therefore, always
Saying on body, the input circuit that the present invention proposes can be to be realized with a low cost gratifying performance.
Alternatively, can include a Zener diode D2 according to the described decision circuitry in the input circuit of the present invention, this is neat
The breakdown reverse voltage of diode received is described threshold voltage.Alternatively, described decision circuitry can also include: two or two
Individual above Zener diode, these Zener diodes are serially connected；At least one bypasses jumper switch, by each
Road jumper switch is connected across the two ends of a described Zener diode, bypasses this Zener diode for selective.Alternatively,
Described decision circuitry can be connected in the path of described input voltage.
Thus, owing to linear voltage regulator has wider input voltage range (such as from tens volts to several hectovolts), thus
Different rated voltage just it is adapted to according to the threshold voltage having only in the input circuit of the present invention utilize wire jumper differently configured
Binary system input quantity under Gong electricity.
Moreover it is preferred that described input circuit also includes the rectified current being connected between described input and described decision circuitry
Road, it can include a commutation diode or a rectifier bridge.Wherein rectifier bridge can be used for receiving ambipolar input
Voltage.
Furthermore it is preferred that described input circuit also includes low pass filter, its be coupling in described electric isolution element output and
Between described outfan.Utilize low pass filter can filter the High-frequency Interference in the signal that will flow to microprocessor.More
For preferably, described input circuit also includes the Schmidt trigger circuit being coupled to described outfan.Utilize schmidt trigger electricity
Road can carry out the lag function in shaping, and Schmidt trigger circuit to the logical signal of output and can avoid defeated further
Enter the less desirable interference that voltage is brought in the fluctuation of near threshold voltage.
Furthermore, in order to give the optocoupler stable driving of offer as electric isolution element, according to the input circuit of the present invention preferably
Also including a storage capacitor C1, it is coupled to the output terminals A of described linear voltage regulator.It is further preferable that this input circuit
Also including a storage capacitor C2, it is coupled to the output of described decision circuitry.The effect of storage capacitor C1 and C2 be
During voltage pulsation, provide instantaneous electric energy for subsequent conditioning circuit, to strengthen the stability of whole circuit.
Additionally, input circuit proposed by the invention can be applied at multiple different industrial control field.Preferably, described
Input circuit may be used for numerical protection relay equipment.
Accompanying drawing explanation
The purpose of the present invention, feature, feature and advantage be will become apparent from by the detailed description below in conjunction with accompanying drawing.
Wherein:
Fig. 1 shows the structured flowchart of protective relaying device in prior art；
Fig. 2 schematically illustrates the structured flowchart of input circuit according to an embodiment of the invention；
Fig. 3 schematically illustrates the structured flowchart of input circuit in accordance with another embodiment of the present invention；
Fig. 4 schematically illustrates the test result of input circuit in accordance with another embodiment of the present invention.
Detailed description of the invention
Each embodiment of the present invention is described below with reference to accompanying drawing.By following description, the above-mentioned advantage of the present invention will be more
Easy to understand.
Fig. 2 schematically illustrates the structured flowchart of binary input circuit according to an embodiment of the invention.Such as Fig. 2
Shown in, binary system input circuit 200 include input 210 (BI_IN and COM), outfan 220, decision circuitry 230,
Circuit voltage stabilizer 240, electric isolution element 250.
As in figure 2 it is shown, input 210 can include two terminal BI_IN_1 and COM.Wherein BI_IN_1 can connect
Receiving a lead-in wire of the contact of an external relay, COM may be coupled to another lead-in wire of this contact.Generally,
COM can be as the common port of different input quantities, and it is generally (GOUND).Preferably, each at input
Individual terminal place is additionally provided with current-limiting resistance R1 and R2 on path, to avoid big circuit damage element.Outfan in Fig. 2
220 are used for being connected to a microprocessor, in order to the logic level that will identify according to the input voltage vin of input 210
(" 1 " or " 0 ") is sent to microprocessor.As previously described, because input 210 is directly connected to external relay, its
Input voltage vin may be such as rated direct voltage 24V, 48V, 60V, 110V, 125V, 220V or 250V,
Or such as alternating voltage 115V or 230V.Outfan 220 is because of microprocessor to be connected to, and its output voltage needs with micro-
The input voltage range of processor matches, for example, 0-5V.
Decision circuitry 230 in input circuit 200 is for carrying out threshold decision to the input voltage vin from input 210.
Alternatively, a rectification circuit, such as shown in Fig. 2 can also be set between decision circuitry 230 and input 210
Individual commutation diode D1, in order to avoid reverse direction current flow.In the example shown in Fig. 2, it is judged that circuit 230 is connected on by one
Zener diode D2 in input voltage path is constituted.The negative electrode of Zener diode D2 is connected to input BI_IN_1.This
Sample, only when input voltage vin is more than the threshold voltage vt h of D2, D2 just understands and punctures and turn on because being reversed, thus
Make this input voltage vin be transported to linear voltage regulator 240, i.e. form active voltage Ve.For example, it is assumed that input voltage vin
From the external relay with specified 110V direct current supply, the then Zener two that D2 can select threshold voltage vt h to be 88V
Pole is managed.Here, Zener diode can also be adopted and be connected in other ways in input circuit 200.Such as D2 can be with one
Individual current-limiting resistance is connected in series in input voltage path, and exemplified by its effect and Fig. 2, son is essentially identical.
Linear voltage regulator 240 can be common linear voltage regulator, it is also possible to be low pressure difference linear voltage regulator (LDO:Low
Dropout Regulator).Linear voltage regulator 240 is a kind of low cost, it is little to encapsulate, peripheral components is few and jamproof blood pressure lowering
Element.Additionally, the input voltage range of linear voltage regulator 240 is wider, with the linear voltage regulator LR8 of Supertex company it is
Example, its input voltage range is between such as 13.2V～450V.Further, since linear voltage regulator is generally equipped with current-limiting function,
Thus its stability and concordance are preferable.Linear voltage regulator 240 generally comprises at least three ends, i.e. manostat input K, steady
Depressor output terminals A and pressure feedback port (also referred to as adjustable side) VREF.The wherein input electricity of manostat input K
Pressure VKNeed the output voltage V more than output end of voltage stabilizer AA。VREFFor obtaining output feedback, i.e. VASize.
V according to samplingA, manostat 240 controls a tube voltage drop adjusting pipe (being operated in linear work district) therein, from
And stable output V is providedA。
In an embodiment of the present invention, linear voltage regulator 240 is each configured to a constant pressure source.Fig. 2 give one the simplest
Constant pressure source configuration example, i.e. output end of voltage stabilizer A coupling one series connection bleeder circuit 241.Series connection bleeder circuit 241
Multiple series resistance can be included.The dividing point B of series connection bleeder circuit 241 is connected to the pressure feedback port of manostat 240
VREF.In example shown in Fig. 2, series connection bleeder circuit 241 preferably includes resistance R3 and R4 of two series connection.VREFFrom
V is obtained on resistance R3AValue of feedback.So, by rationally selecting the size of resistance R3 and R4, linear voltage regulator 240
Output VACan be configured to the constant driving voltage Vd at such as 5V.
Specifically, it is assumed that linear voltage regulator 240 uses the manostat LR8 of Supertex company, its internal VAAnd VREFIt
Between pressure reduction constant at 1.20V, and at VREFEnd current limliting is at such as IADJ=10 μ A, the most then can get and input at manostat
End VKFor virtual value (VKWhen being greater than 13.2V) time, it exports VAOr referred to as Vd is:
VA=Vd=1.20V* (1+R3/R4)+IADJ*R3。
So that linear voltage regulator 240 works more stable, preferably couple an electric capacity C1 in its output terminals A.More
Preferably, a current-limiting resistance R5 connected in series is configured for electric capacity C1, to be limited in electric capacity when manostat 240 powers on
Charging current.
Electric isolution element 250 it is provided with, for by the input voltage of input 210 and micro-process in input circuit 200
Device side keeps apart, in order to avoid from the big voltage of input 210 or the element of circuit damage microprocessor side.Preferably, electricity
Isolation element can select optocoupler as shown in Figure 2.Certainly, as it is well known to the skilled in the art, electrically insulate element also
Other can be used to be capable of the element of electric isolution.In fig. 2, the anode of the light emitting diode of optocoupler is connected to linear steady
The output of depressor 240, the negative electrode of light emitting diode is connected to COM end via current-limiting resistance R6.Here, R5 and R6
All can regard as the current-limiting resistance of optocoupler.The phototriode of optocoupler is coupled to outfan 220.Specifically, phototriode
Colelctor electrode be connected to the power Vcc=+ 5V of microprocessor side via a pull-up resistor R7, its emitter-base bandgap grading is connected to micro-process
The ground (GND) of device side.
Thus, the input voltage vin at input 210 is less than the threshold value electricity of Zener diode D2 in decision circuitry 230
During pressure Vth (such as 88V), it is judged that circuit, without effectively output, does not i.e. have electric current to flow into linear voltage regulator 240, thus linearly
Manostat 240 does not works.At this moment, the light emitting diode in optocoupler 250 is also because of the driving not from linear voltage regulator 240
Electric current and cannot light, cause phototriode to turn off, thus the output of outfan 220 (Vout) be a logic high electricity
Flat VH(such as 5V).On the contrary, the input voltage vin at input 210 is higher than Zener diode in decision circuitry 230
During threshold voltage vt h (the such as 88V) of D2, it is judged that circuit output active voltage, electric current flows into linear voltage regulator 240,
Thus linear voltage regulator 240 exports stable driving voltage, such as+5V.So, the light emitting diode in optocoupler 250 is online
Property manostat 240 driving under light, phototriode turns on, and and then makes the output Vout of outfan 220 from one
Logic high VHIt is switched to a logic low VL(such as 0V).
Fig. 3 schematically illustrates input circuit 300 according to another embodiment of the invention.In figure 3, input electricity
Linear voltage regulator 240 and the optocoupler 250 on road 300 are same as shown in Figure 2, repeat no more here.Unlike Fig. 3 defeated
Enter circuit 300 also include rectifier bridge 360, decision circuitry 330 with wire jumper, storage capacitor C2, wave filter 370 and
Schmidt trigger 380.
Specifically, decision circuitry 330 includes two Zener diode D3 and D4 connected as shown in Figure 3.Wherein, D3
Two ends bridging have bypass jumper switch J3.According to actual needs, bypass jumper switch J3 can selectively turn on, with
Bypass Zener diode D3.For example, it is assumed that the threshold voltage of each Zener diode is 88V, then if wire jumper J3
Disconnecting, then two Zener diode D3 and D4 series connection, correspondingly the threshold voltage of this decision circuitry 330 is 2*88=176V.
When J3 turns on, only Zener diode D4 works, it is judged that the threshold voltage of circuit 330 is 88V.Certainly, ability
Field technique personnel it is understood that according to the demand of actual threshold voltage, the number of Zener diode, connected mode, with
And the threshold value of each Zener diode all can select flexibly.
Additionally, in the input circuit shown in Fig. 3, it is preferable that the single rectification two in Fig. 2 is instead of with rectifier bridge 360
Pole is managed.The use of rectifier bridge 360 is adapted to the situation that input voltage vin is bipolar voltage.Here, rectification circuit
Design main purpose is to avoid reverse current to damage component inverse time in input termination.
Furthermore, preferably at input K one storage capacitor of coupling of linear voltage regulator 240 in example shown in Fig. 3
C2.The purpose of electric capacity C2 and C1 is for the driving electric current stable to optocoupler offer.It is coupling in manostat input K
Storage capacitor C2 instantaneous electric energy can be provided when input voltage vin fluctuates to supply for linear voltage regulator 240.And
The electric capacity C1 being coupling in output terminals A is the output V at linear voltage regulator 240AInstantaneous power compensation is provided during fluctuation.
It addition, at outlet side, the circuit 200 shown in Fig. 3 the most also include a low-pass filter circuit 370 and one execute
Mi Te triggers circuit 380.As it is shown on figure 3, what low-pass filter circuit 370 such as included being made up of resistance R8 and electric capacity C3
RC low-pass filter circuit, to filter the High-frequency Interference in the signal that will send into microprocessor.Schmidt trigger circuit 380
It is preferably provided between the output of low-pass filter circuit and outfan 220 or is directly coupled to outfan 220, for light
The signal of coupling output carries out waveform shaping, and Schmidt trigger circuit also provides for lag function such that it is able to avoid because of input
The signal disturbing that voltage brings near threshold voltage fluctuation.Waveform after Schmidt trigger circuit 380 shaping is essentially
Square wave.
Fig. 4 shows the test result according to the BI circuit 300 shown in Fig. 3.As shown in Figure 4, from low logic level to
The rising response time of high logic level is probably at 500 μ s, and the decline response time from high logic level to low logic level exists
About 1.3ms, and output signal the most substantially fluctuates.
Compared with existing BI circuit, what the present invention proposed utilizes linear voltage regulator, and is configured to constant pressure source and drives
The design of optocoupler, simple in construction, component number are few, low cost.It is additionally, since linear voltage regulator and there is current-limiting function, because of
And the BI stability of channel being so designed that and concordance are good.It is not required to additionally, due to linear voltage regulator is configured to constant pressure source
Want bulky capacitor to form constant-current source, thus the rise time is minimized.Therefore, generally speaking, the BI electricity that the present invention proposes
Road can be to be realized with a low cost gratifying performance.Additionally, due to the wide input voltage range of linear voltage regulator, thus this
The BI circuit that invention proposes can configure relevant threshold value by change wire jumper, it is possible to adapts under different rated voltage
Input quantity.
It will be appreciated by those skilled in the art that each embodiment disclosed above can be in the case of without departing from invention essence
Making various changes and modifications, these change and amendment all should fall within the scope and spirit of the invention.Therefore, the present invention
Protection domain should be defined by the appended claims.
Claims (11)
1. the input circuit of a binary, it is characterised in that: this input circuit (200,300) including:
Input (210), is used for receiving input voltage (Vin)；
Outfan (220), for output the first logic level (VH) or the second logic level (VL)；
Decision circuitry (230), described decision circuitry (230) includes a Zener diode (D2), this Zener diode
Breakdown reverse voltage is predetermined threshold (Vth), and described decision circuitry (230) is coupled to described input (210), is used for
An active voltage (Ve) is exported when described input voltage (Vin) is higher than described predetermined threshold (Vth)；
Linear voltage regulator (240), it is configured to constant pressure source, and the output of described decision circuitry (230) is coupled in its input,
And a driving voltage (Vd) is exported when described decision circuitry (230) is output as active voltage (Ve)；
Electric isolution element (250), described linear voltage regulator (240) is coupled in the input of described electric isolution element (250)
Output, described outfan (220) is coupled in the output of described electric isolution element (250)；
Wherein, described electric isolution element is configured to be not up to described driving voltage (Vd) in the output of described linear voltage regulator (240)
Time, described electric isolution element (250) exports the first logic level (VH)；Output in described linear voltage regulator (240)
During for described driving voltage (Vd), the output of described electric isolution element is from the first logic level (VH) it is switched to the second logic
Level (VL)。
2. input circuit as claimed in claim 1, it is characterised in that:
Described linear voltage regulator (240) at least includes: manostat input (K), output end of voltage stabilizer (A) and voltage
Feedback end (VREF)；
Wherein, described pressure feedback port (VREF) it is used for receiving the output voltage (V of described output end of voltage stabilizer (A)A)
Sampled value, export a constant described driving voltage (Vd) controlling described output end of voltage stabilizer (A).
3. input circuit as claimed in claim 2, it is characterised in that described input circuit (200,300) including:
Being arranged at the series connection bleeder circuit in described linear voltage regulator (240), it is coupled to described output end of voltage stabilizer (A),
And described pressure feedback port (VREF) it is connected to the dividing point (B) of described series connection bleeder circuit, wherein said series connection dividing potential drop electricity
In road (241), the size of divider resistance (R3, R4) determines the driving voltage that described output end of voltage stabilizer (A) exports
(Vd) size.
4. input circuit as claimed in claim 1, it is characterised in that described decision circuitry (230,330) is connected on institute
State in the path of input voltage.
5. input circuit as claimed in claim 1, it is characterised in that described input circuit (200,300) also includes even
It is connected on the rectification circuit between described input (210) and described decision circuitry (230).
6. input circuit as claimed in claim 5, it is characterised in that described rectification circuit includes a commutation diode (D1)
Or a rectifier bridge (360).
7. input circuit as claimed in claim 1, it is characterised in that described input circuit (300) also includes low pass filtered
Ripple device (370), between its output being coupling in described electric isolution element (250) and described outfan (220).
8. input circuit as claimed in claim 1, it is characterised in that described input circuit (300) also includes being coupled to
The Schmidt trigger circuit (380) of described outfan (220).
9. input circuit as claimed in claim 1, it is characterised in that described input circuit (300) also includes a storage
Energy electric capacity (C2), it is coupled to the output of described decision circuitry (230,330), with in described decision circuitry (230,330)
Output pulsation time, for subsequent conditioning circuit provide instantaneous electric energy.
10. input circuit as claimed in claim 1, it is characterised in that described input circuit (200,300) also includes
One storage capacitor (C1), it is coupled to the outfan (A) of described linear voltage regulator (230).
11. input circuits as claimed in claim 1, it is characterised in that described electric isolution element is optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123018.1A CN103378847B (en) | 2012-04-24 | 2012-04-24 | Binary input circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123018.1A CN103378847B (en) | 2012-04-24 | 2012-04-24 | Binary input circuit |
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| CN103378847A CN103378847A (en) | 2013-10-30 |
| CN103378847B true CN103378847B (en) | 2016-11-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105471419B (en) * | 2014-09-11 | 2019-01-25 | 西门子公司 | Two-value input circuit |
| EP3326290A1 (en) * | 2015-07-22 | 2018-05-30 | Mercury Systems Inc. | Multi-voltage to isolated logic level trigger |
| CN106878864B (en) * | 2017-03-03 | 2020-07-10 | Oppo广东移动通信有限公司 | Power supply circuit and audio device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19823441C1 (en) * | 1998-05-19 | 1999-07-08 | Siemens Ag | Digital input assembly for data processing system |
| CN101964653A (en) * | 2009-07-24 | 2011-02-02 | 南京南瑞继保电气有限公司 | Switching value input circuit |
| CN202798651U (en) * | 2012-04-24 | 2013-03-13 | 西门子电力自动化有限公司 | Binary input circuit |
-
2012
- 2012-04-24 CN CN201210123018.1A patent/CN103378847B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19823441C1 (en) * | 1998-05-19 | 1999-07-08 | Siemens Ag | Digital input assembly for data processing system |
| CN101964653A (en) * | 2009-07-24 | 2011-02-02 | 南京南瑞继保电气有限公司 | Switching value input circuit |
| CN202798651U (en) * | 2012-04-24 | 2013-03-13 | 西门子电力自动化有限公司 | Binary input circuit |
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| CN103378847A (en) | 2013-10-30 |
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