CN106406169A - I/O device for direct-current control protection system - Google Patents
I/O device for direct-current control protection system Download PDFInfo
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- CN106406169A CN106406169A CN201610805347.2A CN201610805347A CN106406169A CN 106406169 A CN106406169 A CN 106406169A CN 201610805347 A CN201610805347 A CN 201610805347A CN 106406169 A CN106406169 A CN 106406169A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
- G05B19/0425—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24024—Safety, surveillance
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24092—Warning display lights, lamps, leds on module
Abstract
The invention relates to an I/O device for a direct-current control protection system. The I/O device comprises an isolation component; a device signal input end, an input current limiting module and a signal electric level monitoring module are connected in series in the primary side loop of the isolation component; the input current limiting module is used for controlling the current of external input signals to making the current be in a certain range; the signal input end of the signal electric level monitoring module is correspondingly connected with the device signal input end; the signal electric level monitoring module is used for outputting corresponding signals when the voltage amplitude of the external input signals reaches a set value; and the secondary side output of the isolation component is connected with an output port module. The device can effectively filter out weak signals and effectively resist interference on the device caused by the weak signals, and therefore, with the device adopted, wrong judgment and analysis on field people can be avoided. The device has high anti-interference performance.
Description
Technical field
The present invention relates to a kind of DC control and protection system I/O device.
Background technology
In direct-current power transmission control protection system, between DC fields, alternating-current field primary equipment and control protected host, and control
Need between protected host processed to transmit substantial amounts of real-time device status signal, function logic signal, such as an extra-high voltage direct-current work
The consumption of journey reaches nearly ten thousand.Due to the severe electromagnetic interference environment in scene, for preventing from conjugating the generation leading to error-logic by mistake, enter
And leading to protection misoperation to lead to a disaster, current conversion station operation side requires the signal transmission between screen and screen to forbid adopting low-voltage
Level signal such as DC24V, and DC220V or DC110V voltage levels should be adopted.But as DC control and protection system core
Protected host is controlled to be the state level interface that itself anti-interference needs all uses DC24V low-voltage-grade, thus
Status signal isolation mode block I/O relay module must be increased during status signal turnover screen cabinet to be connected, to realize electricity
Signal isolation, the normal coupling of high/low electric pressure level and conversion.
The I/O relay module that we adopt in engineering site at present has two kinds of patterns, one be electromagnetic relay form, one
Solid-state relay form, but no matter which kind of output form, the input circuit of module be traditional natural conducting with naturally disconnected
Open up meter.
Fig. 1 is that the principle of compositionality of electromagnetic type I/O relay module used in existing direct current transportation controls protection to work as shows
It is intended to.Input direct-current signal circuit includes input Current limited Control unit, LED state indicating member, isolation and output interface.Defeated
Enter Current limited Control unit and generally comprise several resistance, in order to limit input electricity while guaranteeing rear class isolating device driving force
Stream, input power and caloric value.LED state lamp is in order to indicate primary current current intelligence.Isolate and be output as conventional electromagnetic and continue
Electrical equipment mode, the solenoid that former limit input current flows into electromagnetic relay produces galvanomagnetic-effect, and electromagnet attracts internal armature
Motion, the action of driving mechanical contact and produce the closing of contact.Conversely, solenoid dead electricity, electromagnetic attraction disappearance, driving mechanical touches
Point returns and produces contact and disconnect.This intrinsic electromagnetism and mechanical property exist, lead to module open operation voltage many
70%～85% nominal value range, disconnects operation voltage then in 10%～30% nominal value range, far from meeting operation of power networks
The requirement of 55%～70% rated value operation voltage value of defined in code.Meanwhile, if input current more weakness,
There is electric current in the current loop that solenoid is located, but the electric current flowing through can not reach the requirement making contact adhesive, also
The on off operating mode that contact can not be made is consistent with being passed through electric current, and these weak signals belong to interference signal, but this module
These interference signals cannot effectively be kept out, thus Field Force is caused with judgement and the analysis of mistake.
Fig. 2 is that the principle of compositionality of solid-state I/O relay module used in existing direct current transportation controls protection to work as is illustrated
Figure.Input direct-current signal circuit includes input Current limited Control unit, LED state indicating member, isolation and driver element, output
Interface.With shown in Fig. 1, input Current limited Control cell resistance in order to guarantee rear class isolating device driving force and limit input current,
Input power and caloric value, LED state lamp is in order to indicate primary current current intelligence.Except for the difference that isolation method is photoelectricity side
Formula.When input power up signal, photophore emits beam, and light-receiving device just produces photoelectric current after accepting light, and then light-receiving device
Output end flow out or produce photovoltage, it is achieved thereby that " electric light electricity " conversion, can play effective signal isolation with
Anti-Jamming.As precision photoelectric coupler is made up of light emitting diode and phototriode, send out when light emitting diode is connected
Light, photosensitive triode conducting.The characteristic of actual namely its interior light emitting diodes of the input characteristics of photo-coupler, and optical coupling
The characteristic of actual namely its internal phototriode of the output characteristics of device, thus the conducting situation of optocoupler is just being subject to diode
To the impact of the factors such as conducting electric current, triode current transfer ratio CTR, collector current Ic and environment temperature, make leading of optocoupler
Logical action current, shutoff action current have very big inhomogeneities, dispersiveness, lead to action electricity during existing module batch production
Pressure value is dispersed, uncertain, requires far from 55%～70% rated value operation voltage value meeting electrical network code, particularly
Operation voltage is relatively low when off, leads to the impact of system easily interfered signal misoperation.
The LED action instruction state simultaneously having relay module is inconsistent with actual on off operating mode：Module LED is lighted
When, output not necessarily turns on；When output turns off, LED still lights and weak bright, and this often results in operations staff to I/O channel status
Judgment disturbance.The detection of operation voltage point and the break-make control of input signal can not be carried out in existing modular design techniques
System it is impossible to eliminate above design defect and application problem, thus the safe operation of straight-flow system is constituted great harm with
Threaten.
Content of the invention
It is an object of the invention to provide a kind of DC control and protection system I/O device, in order to solve existing I/O module
Working value is exceeded, is especially off that operation voltage is relatively low, leads to the problem that interference free performance is poor.
For achieving the above object, the solution of the present invention includes a kind of DC control and protection system I/O device, including isolation
Drive module, isolation drive module includes isolation element, and in the former limit loop of described isolation element, string is provided with device signal input
End and input current limliting module, in the former limit loop of described isolation element, also string is provided with signal level monitoring modular, described input limit
Flow module and signal level monitoring modular constitute signal input and monitor control unit, and described input current limliting module is used for will be defeated for outside
Enter signal code and control within the specific limits, the signal input part of described signal level monitoring modular is corresponding to connect described device letter
Number input, for exporting corresponding signal when the voltage magnitude of external input signal reaches setting value；Described isolation element
Secondary output connect output port module.
In the former limit loop of described isolation element, also string is provided with LED indicating module.
Described input current limliting module includes over-voltage suppression part, RC filtering part, active component and the voltage stabilizing being sequentially connected
Part.
Described signal level monitoring modular includes a string and is provided with the partial pressure of divider resistance and at least one auxiliary resistance propping up
Road, described partial pressure branch road connects described device signal input part, and the partial pressure end output control of described divider resistance connects a control
System switch, described controlling switch string is located in the former limit loop of described isolation element.
Described isolation element is optoelectronic isolating element, and the secondary of this optoelectronic isolating element is photovoltaic diode array, is used for
Produce the electric power signal of certain voltage according to the optical signal that the former limit of optoelectronic isolating element sends, described isolation drive module is also wrapped
Include a controlling switch, described photovoltaic diode array output control connects described controlling switch, for according to the electric energy producing
Signal controls described controlling switch conducting, the corresponding anode connecting described controlling switch of described output port module and negative electrode.
Described isolation element is a relay module, and the former limit of described isolation element is the control of described relay module
Coil, secondary is a normally opened contact of described relay module, and described output port module is corresponding to connect described normally opened contact
Two ends.
Described over-voltage suppression part is overvoltage su re or VZ1, and described RC filtering part is RC filter circuit, and active component is
Resistance R2, described voltage stabilization part is voltage-stabiliser tube Z1, and the input of described input current limliting module connects described overvoltage su re or VZ1,
Described overvoltage su re or VZ1 is sequentially output connection magnetic bead BZ1, RC filter circuit, resistance R2 and voltage-stabiliser tube Z1.
On described partial pressure branch road, string is provided with divider resistance RF4, and auxiliary resistance RF3, auxiliary resistance RF2And auxiliary resistance
RF1, described divider resistance RF4Two ends be parallel with electric capacity C1 and voltage-stabiliser tube Z1, described divider resistance RF4Hot end pass through steady
Pressure pipe Z2 controls connection controlling switch G1, is connected with resistance R0, described control between the control end of described controlling switch G1 and negative electrode
System switch G1 reverse parallel connection has diode D1.
Described isolation drive module also includes resistance R1, electric capacity C1 with the setting of described photovoltaic diode array in parallel and steady
Pressure pipe Z2, is connected with capacitance-resistance series arm and excess voltage suppressor VZ1, described resistance between the anode of described controlling switch and negative electrode
Hold string in series arm and be provided with resistance R2 and electric capacity C2.
Described isolation drive module also includes the capacitance-resistance series arm being arranged in parallel with normally opened contact and excess voltage suppressor
VZ1, in described capacitance-resistance series arm, string is provided with resistance R1 and electric capacity C1.
The DC control and protection system that the present invention provides is with, in I/O device, input signal is passed through to input the output of current limliting module
To the former limit of isolation module, meanwhile, signal level monitoring modular detects the voltage magnitude of input signal, only when voltage magnitude arrives
When reaching certain value, the output end of this monitoring modular just can export certain signal, makes current limliting module, the former limit of isolation module and prison
Survey module and form a current path, the former limit of isolation module will control secondary to turn on；If input signal is weaker
Words, when that is, shutoff operating voltage is relatively low, its voltage magnitude is less than certain value, and the output end of this monitoring modular would not export letter
Number, then, current limliting module, the former limit of isolation module and monitoring modular just cannot form a current path, isolation module former
Side would not control secondary to turn on.So, this device can turn off operation voltage exceeded when, when that is, too low, prevent I/O device
Action.Therefore, this device can effectively filter out the ironed weak signal of power down, and that effectively keeps out that weak signal causes to this device is dry
Disturb, thus avoiding Field Force is caused judgement and the analysis of mistake.So, the interference free performance of this device is stronger.
Brief description
Fig. 1 is the internal circuit configuration figure that existing direct current transportation controls protection electromagnetic type I/O relay module；
Fig. 2 is the internal circuit configuration figure that existing direct current transportation controls protection solid state I/O relay module；
Fig. 3 is the structural representation of the I/O relay-set that the present invention provides；
Fig. 4 is the electrical block diagram of input current limliting module；
Fig. 5 is the electrical block diagram of signal level monitoring modular；
Fig. 6 is the electrical block diagram of the signal isolation output control unit in solid state I/O relay-set；
Fig. 7 is the electrical block diagram of the signal isolation output control unit in electromagnetic type I/O relay-set；
Fig. 8 is the input and output operating state schematic diagram of I/O relay-set.
Specific embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
In the Control protection system that the I/O device that the present invention provides goes in DC transmission system but it is also possible to
It is applied to other transmission systems or status signal transmission system.And, because this I/O device is typically used in relay protection
In, so, this I/O device is referred to as I/O relay-set by the present embodiment.As shown in figure 3, this I/O relay-set includes letter
Number input monitors control unit and signal isolation output control unit.Wherein, signal input monitors that control unit comprises input limit
Current circuit and signal level observation circuit, signal isolation output control unit includes isolated drive circuit and output interface circuit.
Input current-limiting circuit is provided with signal input part, the corresponding signal input connecting relay-set of this signal input part
End.Signal level observation circuit is again provided with signal input part, its equally corresponding signal input part connecting relay-set.Should
The output end of input current-limiting circuit is connected to the one of the former limit of the isolation element in isolated drive circuit by a LED light
End, the other end of former limit connects the signal output part of signal level observation circuit.
Input current-limiting circuit is used for controlling the electric current in the control signal of outside input and power information in rational model
Enclose；Signal level observation circuit is used for detecting the voltage magnitude size of the control signal of outside input, and is more than in voltage magnitude
Corresponding signal is exported, to carry out to the output end of input current-limiting circuit, LED light, isolation element during one setting value
Former limit and signal level observation circuit signal output part constitute current loop open control.So, this signal electricity
Flat observation circuit can also be referred to as threshold test control circuit.
The secondary output of the isolation element in isolated drive circuit connects output interface circuit, and this output interface circuit is two
Individual output end, this two output ends are exactly the output end of this I/O relay-set.
In the present embodiment, for above-mentioned several circuit, provide a kind of specific circuit structure embodiment respectively, when
So, the relay-set that the present invention provides is not limited to above-mentioned specific circuit structure, as long as being capable of corresponding function,
Other specific circuit structures are also within protection scope of the present invention.In addition, Fig. 4 to Fig. 7 is the structure of four circuit respectively
Figure, because this four circuit are independent circuit structure each other, so, the icon in this four circuit diagrams can share.
As shown in figure 4, the input current-limiting circuit in solid state relay-set includes overvoltage su re or VZ1, magnetic bead
BZ1, resistance R1, electric capacity C1, resistance R2 and Zener diode Z1.Overvoltage su re or VZ1 connect signal input part DC+ and DC- it
Between, electric capacity C1 and resistance R1 constitutes RC filter circuit, and voltage-stabiliser tube Z1 is used for the overvoltage protection to rear class low-voltage circuit, over-voltage suppression
Device VZ1 is sequentially connected magnetic bead BZ1, RC filter circuit, resistance R2, Zener diode Z1 and light emitting diode L1.This input current limliting
Circuit+output end be used for be connected to isolation element former limit one end.
Nominal voltage signal input when input current value computing formula be：
Wherein, UN-INFor signal input rated voltage, UF-OCFor isolation and amplifier control unit isolation element former limit pipe just
To pressure drop, UF-LEDFor light emitting diode forward voltage drop.
For electromagnetic mode relay-set, then former limit pipe forward voltage drop U of isolation optocouplerF-OCElectromagnetism should be accordingly changed to
The primary coil rated value U of relayCOIL, input current value computing formula during its rated signal input voltage is：
As shown in figure 5, being a kind of relay module threshold test control circuit implemented according to the present invention, including resistance
RF1, resistance RF2, resistance RF3, resistance RF4, electric capacity C1, Zener diode Z1, Zener diode Z2, resistance R0, crystal switch pipe G1
With diode D1.Resistance RF1, resistance RF2, resistance RF3, resistance RF4A bleeder circuit is constituted, this bleeder circuit connects after series connection
To positive polarity and the negative polarity end of input signal, wherein, resistance RF4For divider resistance, other three resistance are only intended to assist,
To form this bleeder circuit.Zener diode Z1 and electric capacity C1 all with resistance RF4Parallel connection, resistance RF4Hot end, be not
Ground connection or the one end not connecing direct current negative pole, this hot end controls the control being connected to switching tube G1 after Zener diode Z2
Pole.Zener diode Z2 is the Primary Component controlling, and from accurate Zener diode, such as model selects BZT55-B9V1.Switch
Pipe G1 is taking high-voltage high-speed NPN triode of new generation as a example.Resistance R0The control pole of one end connecting triode G1, the other end connect to
The negative polarity end (i.e. the emitter stage of triode G1) of input signal.Triode G1 reverse parallel connection diode D1.
Triode G1 is to possess high dc gain hFE, high VCEO(being not less than 300V), low VCEsatMiniaturized crystal pipe, surely
The impact to action point value for the voltage stabilizing error of pressure diode is larger, and error is not less than B level.
Input signal is first through resistance RF1, resistance RF2, resistance RF3With resistance RF4Series connection partial pressure, the voltage U after partial pressureDVI.e. electricity
Resistance RF4The voltage at two ends, works as UDVMagnitude of voltage be more than Zener diode Z2 burning voltage VZAfterwards, the base stage of triode G1 is height
Level, so that the collector and emitter output conducting of triode G1.Wherein electric capacity C1 and divider resistance coordinate for filtering
Ripple, Zener diode Z1 is used for suppressing instantaneous overvoltage to protect rear class low voltage circuit, resistance R0Non-conduction for triode
The drop-down control of shutoff under state, diode D1 is used for the reverse protection of triode G1.Operation voltage threshold value U of triode G1ON
Correlation computations formula be：
So, only as resistance RF4The voltage at two ends, when that is, the voltage magnitude of input signal reaches with certain value, triode
G1 just turns on.And, the colelctor electrode of triode G1 connects the other end of the former limit of isolation element, that is, input current-limiting circuit+defeated
Go out end, the former limit of isolation element and triode G1 and constitute a current loop, only when triode G1 turns on, this current loop
Just turn on, isolation element and follow-up circuit can export corresponding signal.
In the present embodiment, provide the circuit structure of two kinds of signal isolation output control units, wherein, as shown in fig. 6, being one
Plant the electrical block diagram of the isolated drive circuit in solid state signal isolation output control unit and output interface circuit；As
Shown in Fig. 7, it is that the isolated drive circuit in a kind of electromagnetic type signal isolation output control unit is shown with output interface circuit structure
It is intended to.
Illustrate one by one below：
As shown in fig. 6, the isolation element in isolated drive circuit is photoelectrical coupler IC1, then, photoelectrical coupler IC1
Former limit be light emitting diode, but, general or traditional optocoupler secondary optical receiving set is phototriode, and with tradition
Unlike optocoupler, the internal optical receiving set of this photoelectrical coupler IC1 is photovoltaic diode array, and this is in the case of light irradiation
The DC voltage of certain driving power can be produced.
The former limit of isolated drive circuit, that is, the two ends of light emitting diode respectively connect input current-limiting circuit+output end and
Signal level observation circuit+output end, and, the former limit of isolated drive circuit is in parallel with voltage-stabiliser tube Z1, and voltage-stabiliser tube Z1 is can
Play the effect of reverse polarity protection photoelectrical coupler IC1.Resistance R1, electric capacity C1, voltage-stabiliser tube Z2 are connected in parallel on isolation drive electricity respectively
The secondary on road, i.e. the two ends of photovoltaic diode array, play burning voltage and Anti-Jamming.The secondary of photoelectrical coupler IC1 is defeated
Go out to control the control pole of connecting valve pipe G1, switching tube G1 in this Fig. 6 taking MOSFET pipe as a example, i.e. photoelectrical coupler IC1
Secondary output control connects the grid of MOSFET pipe G1.The CR seriescir cuit being made up of resistance R2 and electric capacity C2 and overvoltage
Suppressor VZ1 is all in parallel with MOSFET pipe G1, is protected with MOSFET pipe G1 can be carried out with transient overvoltage to suppress peak voltage.
The current loop conducting being located when the former limit of photoelectrical coupler IC1, when there is electric current inside, electric current flows through photoelectric coupling
Light emitting diode within device IC1, produces the infrared light of some strength, the photosensitive inspection of rear class taking infrarede emitting diode as a example
Survey device is photovoltaic diode array, and it has the open-circuit voltage applying of certain amplitude and energy producing after Infrared irradiation
To the grid of MOSFET pipe G1, MOSFET pipe G1 is made to turn on.This open-circuit voltage values typically in 10V, load current 10～
20uA, the driving force that can meet general switching tube requires.Conversely, when the electric current that the former limit of photoelectrical coupler IC1 is located returns
When road turns off, electric current is not just had to flow through infrarede emitting diode, photovoltaic diode array also just cannot produce voltage and export
The grid of MOSFET pipe G1, MOSFET pipe G1 turns off.In addition, the drain electrode of MOSFET pipe G1 is just typically connecing external dc power
Pole, source electrode is concatenated into signal path top below, MOSFET pipe G1 conducting then rear class signal circuit conducting, and MOSFET pipe G1 turns off
Then rear class signal circuit disconnects.
As shown in fig. 7, isolation element is electromagnetic relay K1, so, the former limit of this isolation element correspond to relay K1
Control coil, secondary correspond to the normally opened contact of this relay.The control coil of relay K1 is arranged in parallel with voltage-stabiliser tube Z1,
There is the effect of decrease uptake coil inverse electromotive force.And the CR seriescir cuit being made up of resistance R1 and electric capacity C1 and overvoltage
Suppressor VZ1 is all connected in parallel on the two ends of normally opened contact, and excess voltage suppressor VZ1 is in order to carry out transient overvoltage to this normally opened contact
Protection.
What Fig. 6 expressed is the solid-state relay form using photoelectric isolating device, and Fig. 7 expression is then using traditional electricity
Magnetic relay form.Pluses and minuses are respectively had in the two application.Solid-state relay adopts Phototube Coupling mode, and corresponding speed is fast, contact
Output non-jitter no electric arc, action stability with safe；Electromagnetic relay actuation time is slow, contact chatter big, but it touches
Point is nonpolarity mode, voltage adaptation scope is wide, low cost, thus can be selected according to different demands in engineer applied.Fig. 7
In K1 be conventional electromagnetic relay, its output contact be hard contact, be a mechanical switch pattern, external circuit is led
Only this switch series need to be accessed signal circuit below when logical can be it is not necessary to provide any driving power supply.
A concrete application example given below.
R in Fig. 5F1Resistance be 54K Ω, RF2Resistance be 27K Ω, RF3Resistance be 7.5K Ω, RF4Resistance be
15K Ω, burning voltage VZ=VZ2+VBE, wherein, VZ2For the burning voltage of Zener diode Z2, VBEBase stage for triode G1 with
Transmitting voltage across poles.In addition to Zener diode Z2, electric capacity C1 is filter action, and Zener diode Z1 makees for overvoltage protection
It is weak pull-down function with, R1, the conducting of equal triode G1 controls unrelated.
Operation voltage threshold value UONRelated computing formula is：
Work as UDVWhen voltage is increased to 61.47% rated voltage, voltage is given to triode G1's by Zener diode Z2
Base stage, the colelctor electrode of triode G1 and transmitting interpolar conducting, then the current loop that triode G1 is located is open-minded, rear class photoelectric coupling
The secondary of device IC1 produces certain voltage, thus driving late-class circuit to export.Meet design code 61%～62% is specified defeated
Enter range of voltage values to require.In addition the parameter error of device, such as resistance precision, voltage-stabiliser tube precision etc. are considered, in practical application
Turn-on action voltage threshold is respectively positioned on 61%～62% nominal input voltage value scope.
According to the above analysis to turn-on action voltage threshold, know that its turn-on action voltage threshold is respectively positioned on 61%～62%
Nominal input voltage value scope.Due to general switchable semiconductor devices class, such as triode G1 turn off voltage have certain slow
Stickiness, that is, have certain stagnant loop voltag, and curtage value during its shutoff is slightly smaller than current value or magnitude of voltage during its conducting.
Stagnant loop voltag in the present invention maintains essentially in downward 1% scope, thus turns off operation voltage threshold value and be less than turn-on action voltage
Threshold value 61%～62% nominal input voltage value scope, is generally located at 60%～61% nominal input voltage value scope, actual batch
Measure examination and also demonstrate this point.
So, for the solid state signal isolation output control unit shown in Fig. 6, as DC+ and DC- of this relay-set
Between apply DC110V voltage when, UON>=67.1V～68.2V (61%～62% nominal input voltage value), in signal level monitoring
Threshold test controls point voltage Ub >=9.1V (the turn-on action voltage threshold of triode G1), and triode G1 turns on, and inputs current limliting
Current loop between control loop and signal level observation circuit is connected, and LED light is lighted, and photoisolator IC1's is red
UV light-emitting diode turns on, and the photovoltaic diode array of photoisolator IC1 produces about 10V open-circuit voltage through Infrared irradiation,
MOSFET pipe G1 grid Ug is high level, and MOSFET pipe G1 turns on, two output end conductings of this relay-set.
When releasing DC110V voltage when between DC+ and DC-, UON≤ 66V～67V (60%～61% nominal input voltage value),
In signal level monitoring, threshold test controls point voltage Ub≤9.1V (the turn-on action voltage threshold of triode G1), triode G1
Turn off, the current loop cut-out between input Current limited Control loop and signal level observation circuit, LED light is extinguished, photoelectricity
The infrarede emitting diode of isolator IC1 turns off, and the photovoltaic diode array two ends 10V open-circuit voltage of photoisolator IC1 disappears
Lose, the grid Ug of MOSFET pipe G1 is low level, and MOSFET pipe G1 turns off, and two output ends of this relay-set turn off.
For the electromagnetic type signal isolation output control unit shown in Fig. 7, apply when between DC+ and DC- of this relay-set
Plus during DC110V voltage, UON>=67.1V～68.2V (61%～62% nominal input voltage value), threshold value in signal level monitoring
Detection controls point voltage U2 >=9.1V (the turn-on action voltage threshold of triode G1), and triode G1 turns on, and inputs Current limited Control
Current loop between loop and signal level observation circuit is connected, and LED light is lighted, the primary coil of electromagnetic relay K1
Powered, normally opened contact closes, two output end conductings of this relay-set.
When releasing DC110V voltage when between DC+ and DC- of this relay-set, UON≤ 66V～67V (60%～61% volume
Determine input voltage value), in signal level monitoring, threshold test controls point voltage U2≤9.1V (turn-on action voltage threshold), three poles
Pipe G1 turns off, the current loop cut-out between input Current limited Control loop and signal level observation circuit, and LED light is extinguished,
The primary coil dead electricity of electromagnetic relay K1, normally opened contact recovers off-state, and two output ends of this relay-set turn off.
Fig. 8 show the input and output movement state diagram of the I/O relay-set of the embodiment of the present invention.In the present embodiment
In, no matter the isolated form of device is photo-electric or electromagnetic type, and during device conducting, relay all works in volume with photoelectric device
Determine near current value, it is to avoid based on device from the edge parameters dispersion of firing point or operating point, uncertain problem.And, it is logical
Cross the selection to device parameters, the turn-on action voltage threshold of device can be made generally to be located at 61%～62% nominal input voltage
Value scope, consistent with the action point value presetting and calculate, and turn off operation voltage threshold value and be generally located at 60%～61%
Nominal input voltage value scope, possesses the beneficial lagging characteristics of 1～2V.Fully meet 55%～70% volume in grid operation codes
Determine the requirement of magnitude of voltage action, thus effectively prevent because of photoelectric device conducting dispersiveness, electromagnetic relay pick-up voltage height, releasing
Put original drawback of brownout.
The above-mentioned structure to I/O relay-set is described, and connected applications example is to I/O relay-set
Operation principle is illustrated.So, the I/O relay-set that the present invention provides is accomplished that two control shape between protected host
The isolation of high-low voltage level status signal, conversion and electric pressure adaption function during the long-distance transmissions of state signal.In system
Two protected host end status signal voltage grades be 24VDC so that at least two types I/O conversion, a species
Type is input end signal is 24VDC electric pressure, is fitted to DC220V or DC110V voltage levels signal through isolation conversion defeated
Go out end；Another type is input end signal is DC220V or DC110V electric pressure, is fitted to the low electricity of 24VDC through isolation conversion
Pressure grade output end.In brief, the I/O relay-set that the present invention provides has two types, the input of both types
Different with the electric pressure that output end connects：The input of a type of I/O device is 24VDC grade, and output end is
DC220V or DC110V electric pressure；The input of another kind of I/O device is DC220V or DC110V grade, and output end is
24VDC electric pressure, as described in Table 1.
Table 1
| Input port | Output port | |
| The first I/O device | DC110V (or DC220V) | DC24V |
| Second I/O device | DC24V | DC110V (or DC220V) |
In above-described embodiment, on the connection line between input Current limited Control unit and isolation element, string is provided with LED instruction
Lamp, can intuitively be represented by this LED light and whether there is electric current in this current loop, certainly, a kind of this simply optimization
Embodiment, as other embodiments, this LED light can also be without arrange.
It is presented above specific embodiment, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, for those of ordinary skill in the art, according to the teachings of the present invention, designs various changes
The model of shape, formula, parameter do not need to spend creative work.Right without departing from the principles and spirit of the present invention
Change, modification, replacement and modification that embodiment is carried out still fall within protection scope of the present invention.
Claims (10)
1. a kind of DC control and protection system I/O device, including isolation drive module, isolation drive module includes isolation unit
Part, in the former limit loop of described isolation element, string is provided with device signal input part and input current limliting module it is characterised in that described
In the former limit loop of isolation element, also string is provided with signal level monitoring modular, described input current limliting module and signal level monitoring mould
Block constitutes signal input and monitors control unit, and described input current limliting module is used for external input signal current control in certain model
In enclosing, the signal input part of described signal level monitoring modular is corresponding to connect described device signal input part, for defeated in outside
The voltage magnitude entering signal reaches and exports corresponding signal during setting value；The secondary output of described isolation element connects output port
Module.
2. DC control and protection system according to claim 1 with I/O device it is characterised in that described isolation element
In former limit loop, also string is provided with LED indicating module.
3. DC control and protection system according to claim 1 and 2 with I/O device it is characterised in that described input current limliting
Module includes over-voltage suppression part, RC filtering part, active component and the voltage stabilization part being sequentially connected.
4. DC control and protection system according to claim 1 and 2 with I/O device it is characterised in that described signal level
Monitoring modular includes the partial pressure branch road that a string is provided with divider resistance and at least one auxiliary resistance, and described partial pressure branch road connects institute
State device signal input part, the partial pressure end output control of described divider resistance connects a controlling switch, described controlling switch string
It is located in the former limit loop of described isolation element.
5. DC control and protection system according to claim 1 and 2 with I/O device it is characterised in that described isolation element
For optoelectronic isolating element, the secondary of this optoelectronic isolating element is photovoltaic diode array, for former according to optoelectronic isolating element
While the optical signal sending produces the electric power signal of certain voltage, described isolation drive module also includes a controlling switch, described
Photovoltaic diode array output control connects described controlling switch, for controlling described controlling switch according to the electric power signal producing
Conducting, the corresponding anode connecting described controlling switch of described output port module and negative electrode.
6. DC control and protection system according to claim 1 and 2 with I/O device it is characterised in that described isolation element
For a relay module, the former limit of described isolation element is the control coil of described relay module, and secondary is described relay
One normally opened contact of device module, the corresponding two ends connecting described normally opened contact of described output port module.
7. DC control and protection system according to claim 3 with I/O device it is characterised in that described over-voltage suppression portion
It is divided into overvoltage su re or VZ1, described RC filtering part is RC filter circuit, active component is resistance R2, described voltage stabilization part is
Voltage-stabiliser tube Z1, the input of described input current limliting module connects described overvoltage su re or VZ1, and described overvoltage su re or VZ1 is successively
Output connects magnetic bead BZ1, RC filter circuit, resistance R2 and voltage-stabiliser tube Z1.
8. DC control and protection system according to claim 4 with I/O device it is characterised in that on described partial pressure branch road
String is provided with divider resistance RF4, and auxiliary resistance RF3, auxiliary resistance RF2With auxiliary resistance RF1, described divider resistance RF4Two ends
It is parallel with electric capacity C1 and voltage-stabiliser tube Z1, described divider resistance RF4Hot end pass through voltage-stabiliser tube Z2 control connect controlling switch
G1, is connected with resistance R0 between the control end of described controlling switch G1 and negative electrode, described controlling switch G1 reverse parallel connection has two poles
Pipe D1.
9. DC control and protection system according to claim 5 with I/O device it is characterised in that described isolation drive mould
Block also includes resistance R1, the electric capacity C1 and voltage-stabiliser tube Z2 with the setting of described photovoltaic diode array in parallel, described controlling switch
It is connected with capacitance-resistance series arm and excess voltage suppressor VZ1, in described capacitance-resistance series arm, string is provided with electricity between anode and negative electrode
Resistance R2 and electric capacity C2.
10. DC control and protection system according to claim 6 with I/O device it is characterised in that described isolation drive mould
Block also includes the capacitance-resistance series arm being arranged in parallel with normally opened contact and excess voltage suppressor VZ1, in described capacitance-resistance series arm
String is provided with resistance R1 and electric capacity C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610805347.2A CN106406169A (en) | 2016-09-06 | 2016-09-06 | I/O device for direct-current control protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610805347.2A CN106406169A (en) | 2016-09-06 | 2016-09-06 | I/O device for direct-current control protection system |
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| Publication Number | Publication Date |
|---|---|
| CN106406169A true CN106406169A (en) | 2017-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610805347.2A Pending CN106406169A (en) | 2016-09-06 | 2016-09-06 | I/O device for direct-current control protection system |
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| Country | Link |
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| CN (1) | CN106406169A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108512544A (en) * | 2018-04-24 | 2018-09-07 | 中国船舶重工集团公司第七二六研究所 | conversion circuit |
| CN109217854A (en) * | 2017-07-04 | 2019-01-15 | 许继集团有限公司 | It is applicable in the indicating circuit of two kinds of level driving |
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|---|---|---|---|---|
| CN109217854A (en) * | 2017-07-04 | 2019-01-15 | 许继集团有限公司 | It is applicable in the indicating circuit of two kinds of level driving |
| CN109217854B (en) * | 2017-07-04 | 2023-06-02 | 许继集团有限公司 | Indication circuit suitable for two level driving |
| CN108512544A (en) * | 2018-04-24 | 2018-09-07 | 中国船舶重工集团公司第七二六研究所 | conversion circuit |
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