CN2454892Y - Intelligent high-precision current-limiting knife switch - Google Patents
Intelligent high-precision current-limiting knife switch Download PDFInfo
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- CN2454892Y CN2454892Y CN 00255885 CN00255885U CN2454892Y CN 2454892 Y CN2454892 Y CN 2454892Y CN 00255885 CN00255885 CN 00255885 CN 00255885 U CN00255885 U CN 00255885U CN 2454892 Y CN2454892 Y CN 2454892Y
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Abstract
The utility model relates to an intelligent high-precision current-limiting knife switch which is composed of an executing part and a controlling part and comprises a silicon-controlled switch, an electromagnetic tripper, and a manual resetting switch. The controlling part is composed of a rectifying unit, a voltage stabilizing circuit, a power supply voltage detecting circuit, a reverser circuit, a voltage fluctuation display, current sampling circuit, a rectifying circuit, a voltage detecting and comparing circuit, a reverser, a load condition display, and a function exempting switch, wherein, the controlling part, the electromagnetic tripper, and the manual resetting switch form a controllable knife switch. The utility model has the advantages of novel design, reasonable structure, multi-function, stable and reliable performance, and high controlling precision.
Description
The utility model relates to a kind of knife switch, particularly intelligent high accuracy current limliting plug-in strip.
People often pay attention to the safety of generating and power consumption equipment when using electric energy, and despise the correct use of technology of electric energy transmitting and the safe operation of transfer wire, so cause another power outage and many fire incidents together.For the fire incident that reduces power outage and cause thus, people have in time adopt low-melting terne metal fuse (being commonly called as fuse) resist technology that the safety of supply line is protected.But fuse has many shortcomings that can't overcome and unsatisfactory place.As the cross section of fuse and the relation of line current, the general masses can't correctly grasp, so that with in the electric process, occur because of selecting the improper accident that causes of fuse for use in a large number.After terne metal fuse protection technology, building trade adopts " air switch " to make the usefulness of route protection again in a new generation's building in a large number in recent years, to replace traditional fuse technology.The technological core of " air switch " is a manual reset knife switch that is jointly controlled by " thermal overload release " and " magnetictrip "; when it exceeds some at load current; can thread off automatically, thereby make the plug-in strip automatic shutdown circuit, realize current-limiting protection.But, the NOL normal overload and the improper overload of circuit there is not recognition capability because of it is a mechanical trip gear eventually.Therefore, its control precision can not be done very highly.
The purpose of this utility model is, improves at above-mentioned the deficiencies in the prior art, proposes and design a kind of intelligent high accuracy current limliting plug-in strip.
Solution of the present utility model is, form by operating part and control section, comprise reverse-blocking tetrode thyristor, magnetictrip and manual reset switch, it is characterized in that, control section is exempted switch by rectification unit, voltage stabilizing circuit, voltage detection circuit, Nverter circuit, voltage fluctuation display, current sampling, rectification, voltage detecting and comparison circuit, reverser, load condition display, function and is formed, wherein, control section and magnetictrip and manual reset switch are formed controlled plug-in strip.
It is characterized in that, voltage detection circuit is formed a window type voltage detecting comparison circuit by operational amplifier A 3 and A4, magnitude of voltage is to obtain after divider resistance R19, the R20 of series connection and R21 go up dividing potential drop, and the signal input part of this circuit is the connection point D of the inverting input of the in-phase input end of amplifier A3 and amplifier A4.
It is characterized in that, voltage detecting and comparison circuit have adopted by operational amplifier A 1 and A2 forms a window type current detecting and comparison circuit, and the direct-current working volts VCC of the high stability of this circuit is the direct-current working volts that obtain after tandem divider resistance R8, R9 and R10 dividing potential drop.
It is characterized in that the load condition display adopts red yellowish green trichromatism lamp driver load state display.
It is characterized in that, the manual reset switch of controlled plug-in strip has adopted the two-way plug-in strip J that is controlled by a positioning hanger, positioning hanger one end connects with the electromagnet moving armature of magnetictrip, electromagnet J1 is voltage detection circuit and voltage detecting and the comparison circuit that is controlled by control section, and the two-way plug-in strip J of the other end of positioning hanger and its control connects.
It is characterized in that positioning hanger is furnished with the manual operation handle.
It is characterized in that, magnetictrip is by electromagnet coil, the electromagnet moving armature, positioning hanger is formed, magnetictrip is on base, positioning hanger connects the manual operation handle, one end and the electromagnet moving armature of positioning hanger connect, its other end and manual operation handle connect, the manual operation handle cooperates with the two-way plug-in strip J that is subjected to its control by dress pressing plate thereon, two moving contacts of two-way plug-in strip J are fixed on the base by screw, two fixed contacts directly are fixed on the base, the entity circuit of control section is contained on the printed circuit board (PCB), printed circuit board (PCB) is a U-shaped, in the U-shaped neutral gear of manual operation handle dress printed circuit board (PCB), and can do to cooperate with the moving contact of its below two-way plug-in strip J, the bottom of manual operation handle is installed on the base by bearing pin, the current sampling magnet ring that coil H is housed is joined the lead fixed that connects by what pass it on base with external friendship source current line, on the base-mounted input wires terminal of lead one end, the other end of lead and fixed contact weldering connect, in addition, be connected to lead respectively between two output wiring terminals and two moving contacts, constitute electric channel, base is furnished with shell, four key switches are housed on the shell, they are K1, K2, K3, K4, there is cable-through hole the below, side of shell 2.
The characteristics that the utlity model has are: 1, to the control precision of the high target of line current, the utility model has adopted new devices such as efficient current voltage changer, integrated regulator, three look displays etc. to form high-precision voltage comparator circuit.By the detection signal of voltage comparator circuit output again on high-precision measuring instrument is calibrated to 5% operating point, thereby guarantee this technical indicator reliably.Here it is, and the utility model can be handled the technical measures that magnetictrip is implemented route protection with 5% precision.2, red yellowish green trichromatism lamp driver load state display; the utility model has adopted the indicator light of common cathode red and green color light-emitting diode therein; in order to show the load condition of protected circuit; light-emitting diode after calibration is less than or equal to 8% o'clock of specified protection value at load current; only bright single green LED; indicator light externally is green radiance, is expressed as " underloading ".And equal 80% of specified protection value ~ 105% o'clock at load current, and it is luminous that red, green two light-emitting diodes are all lighted simultaneously, externally is orange-yellow radiance, and this is " being fully loaded with ".When load current is worth 105% greater than specified protection, except that implementing open circuit protection, only bright single red light emitting diodes, the indicator light radiance that externally takes on a red color, this is " overload ".So claim " demonstration of tri coloured lantern state ".3, NOL normal overload in the circuit and improper overload there is recognition capability.Because the utility model is electronics " intelligence " the type testing circuit that constitutes with novel electron device, novel circuit technology.It to the NOL normal overload of protected circuit (as high-power electric appliance start, during motor start-up) and quantity be that 105% slight overload is discerned, and do not protect by mistake.This performance is not only the guarantee of High Accuracy Control index, and is the guarantee of steady continued power.4, the supply voltage fluctuation there is the strain defencive function.As everyone knows: when significantly fluctuating appears in supply voltage, be easy to power consumption equipment is caused damage.Therefore, national Specification mains fluctuations amplitude should be less than ± 10%.But because all odjective causes, China is the area a lot, and particularly vast rural area and outlying district can't reach this technical indicator at all.In order to protect power consumption equipment, the utility model can be pressed the electricity consumption wish, to the situation of supply voltage fluctuation, implements (or not implementing) power-off protection.By " switch " that the utility model constitutes, set after calibrating: supply voltage is " overvoltage " being higher than 253V (greater than rated value 15%); And supply voltage when being lower than 176V (less than rated value-20%) be " under voltage "; Have only supply voltage between ~ 176V, to be " normally " (company standard) when (promptly between 15% ~-20%).When overvoltage or under voltage occurring, " switch " implements protection with auto-cutout.But the user also can operate " release key " avoiding implementing power-off protection, in the hope of continue steadily from.5, to aforementioned the 2nd similar, to the supply voltage fluctuation, " automatic switch " also is provided with red, yellow, a green tri coloured lantern in addition and shows corresponding to " overvoltage ", " normally ", " under voltage ".Economical, attractive in appearance, novel, practical.6, machine self-checking function.The utility model is provided with " simulation overload ", " simulation overvoltage ", " simulation under voltage " button, and the user can press above-mentioned button at any time, and " automatic power-off switch " should make the corresponding protection reaction at this moment.By operating this function, the user can check the reliability of " switch " work at any time.7, no power supply transformer circuit.In the conventional electronic instrument, short bound power transformer.But the testing circuit minimal power consumption in the utility model " switch ", so after improving, removed power transformer.This measure has not only reduced cost, has alleviated product weight, has eliminated the thermal losses that transformer causes, and great advantage also is to have avoided caused a series of faults because of the long-term Fa Gaore of electric shock of power transformer, has improved the stability of work to a great extent.
The utility model has the advantages that novel in design, rational in infrastructure, function is many, stable and reliable for performance, the control precision height.
Fig. 1, the basic structure schematic diagram that embodiment of the present utility model adopts
Fig. 2, the end view of the basic structure schematic diagram that embodiment of the present utility model adopts
Fig. 3, the circuit block diagram that the utility model embodiment adopts
Fig. 4, the control section circuit theory diagrams that the utility model embodiment adopts
Below with reference to the accompanying drawings, describe embodiment of the present utility model in detail.
As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the utility model is made up of operating part and control section.Comprise controllable silicon switch 21, magnetictrip 18 and manual reset switch 17.Wherein, magnetictrip 18 is made up of electromagnet coil 12, electromagnet moving armature 11, positioning hanger 10, and magnetictrip 18 is on base, and positioning hanger 10 connects manual operation handle 8.One end and the electromagnet moving armature 11 of positioning hanger 10 connect, and its other end and manual operation handle 8 connect.Manual operation handle 8 cooperates with the two-way plug-in strip J that is subjected to its control by dress pressing plate 7 thereon.Two moving contacts 6 of two-way plug-in strip J are fixed on the base by screw 10, and two fixed contacts 15 directly are fixed on the base.The entity circuit of control section is contained on the printed circuit board (PCB) 5, printed circuit board (PCB) 5 is a U-shaped, in the U-shaped neutral gear of manual operation handle 8 dress printed circuit board (PCB)s 5, and can do to cooperate with the moving contact 6 of its below two-way plug-in strip J, the bottom of manual operation handle 8 be installed on the base by bearing pin.The current sampling magnet ring 3 that coil H is housed is by passing joining the lead 4 that connects with external friendship source current line and being fixed on the base of it, on the base-mounted input wires terminal 1 of lead 4 one ends, the other end of lead 4 and fixed contact 15 welderings connect, in addition, be connected to lead 4 respectively between two output wiring terminals 13 and two moving contacts 6, constitute electric channel.Base is furnished with shell 2, and four key switches 16 are housed on the shell 2, and they are K1, K2, K3, K4.There is cable-through hole 14 below, side of shell 2.Control section is exempted switch 26 by rectification unit 19, voltage stabilizing circuit 23, voltage detection circuit 22, Nverter circuit 25, voltage fluctuation display 27, current sampling 20, rectification 24, voltage detecting and comparison circuit 28, reverser 29, load condition display 30, function and is formed.Wherein, control section and magnetictrip 18 and manual reset switch 17 are formed controlled plug-in strip.
Power unit is made of rectification unit 19, voltage stabilizing circuit 23, the rectification unit 23 that ballast decompression capacitor C1 and rectifier bridge ZL1 form, be connected across between the continuous lead of input terminal AN1 and AN2, be connected to capacitor C 2 between the output of rectification unit 19 and the ground, connect again by ic chip 2 and join even with capacitor C 3, resistance R 1, adjustable resistance R2, join the two-stage voltage stabilizing circuit that is composed in series that connects with IC3 and capacitor C 5, resistance R 3, adjustable resistance R4, between ic chip 2 and IC3 series connection point and ground, be connected to capacitor C 4.The output terminals A point voltage to earth of rectification unit is 22V, and ic chip 2 and IC3 series connection point B point voltage to earth are 17V, and the output C point voltage to earth of IC3 is 12V.
The output of operational amplifier A 3 connects the reverser of being made up of R24, BG2, R26, and the output of operational amplifier A 4 connects the Nverter circuit of being made up of R25, BG3, R27 25, and reverser and voltage fluctuation display connect.Voltage fluctuation display 27 adopts cathode red and green color light-emitting diode DZ2 altogether, i.e. " tri coloured lantern ".Wherein, the positive pole of red light emitting diodes connects the collector electrode of BG3, and the positive pole of green LED connects the collector electrode of BG2.
In sum, the utility model mainly contains four parts, and first is a power supply: second portion is that supply voltage detects and state shows; Third part is that load current detects and state shows; The 4th part is an operating part; Wherein, limiting to a number or amount and be divided into different specified values load current: promptly 12.5A, 25A and 50A are three kinds.Basic principle and operating state are described below respectively now:
One, power supply
After single phase alternating current power supply voltage (effective value 220V) inserted input terminal AN1 and AN2, the ballast decompression capacitor C1 of control section circuit was connected to bridge rectifier ZL1, can obtain the direct voltage of positive 22V over the ground at its output terminals A point after rectification.This voltage will fluctuate with the fluctuation of AC supply voltage.This voltage after C2 filtering, divide three the tunnel output: the one road delivers to the voltage stabilizing circuit 23 that is composed in series by IC2 and IC3, after voltage stabilizing to the complete machine operating voltages that provide at different levels.The bleeder circuit of being made up of R17 and R18 is delivered on another road, sends into the voltage detecting circuit of being made up of amplifier A3 and A4 after dividing potential drop again, as the signal source of reflection mains fluctuations, variation.Third Road is then received on the electromagnet coil of magnetictrip 18, as the usefulness of the driving voltage of electromagnetic trip.
Because of integrated regulator 7805 is familiar with by everybody already, so its operation principle and the course of work are omitted.At a high speed raise resistance R 2 and R4 can obtain respectively over the ground at the output of IC2 and IC3+stable DC voltage VB and the VC of 17V and over the ground+12V.Wherein, VC is a complete machine operating voltage at different levels.
Two, supply voltage detects and the tri coloured lantern demonstration
So-called " supply voltage detection " means the detection to the sinusoidal effective value of single phase alternating current power supply 220V of input.The utility model is that the interior voltage of normal voltage (220V)-20% ~+15% scope is set at " normally " supply district to the single phase alternating current power supply voltage effective value of input.When this voltage effective value during, be set at " under-voltage " less than normal voltage-20% (promptly being lower than 176V); When voltage effective value overgauge voltage+15% when (promptly being higher than 253V), be set at " overvoltage ".Such setting is better than national standard (± 10%).
Utility model by above-mentioned established standards development when above-mentioned " normally " supply power voltage, can provide the electric current of the single phase alternating current (A.C.) electric power in the load current value to the single phase alternating current (A.C.) power consumption equipment.And, will implement power-off protection automatically when supply voltage during in above-mentioned " overvoltage " or " under-voltage " scope.But; if the user assert when supply voltage during in above-mentioned " overvoltage and under-voltage " scope, all can not cause damage to power consumption equipment, the user also voluntarily the release switch 26 of operating voltage measuring ability be K4; voltage detecting and defencive function thereof are exempted, thereby can obtain continued power.
Simply introduce the operation principle and the course of work that supply voltage detects the status display circuit 27 that reaches relevant " tri coloured lantern " below.Form a window type voltage detecting, comparison circuit by operational amplifier A 3 and A4.According to the standard that the utility model is set, the upper limit fiducial value of this circuit is that 4.6V, lower limit fiducial value are 3.2V.These two magnitudes of voltage are upward to obtain after the dividing potential drop from divider resistance R19, the R20 of series connection and R21.The signal input part of this circuit is the connection point D of the inverting input of the in-phase input end of amplifier A3 and amplifier A4.The signal of this point is taken from the dividing point of divider resistance R17 and R18.R18 can be+obtain over the ground during 22V+partial pressure value of 4V at AC-input voltage 220V, VA.As saying that in " power supply " part this voltage has quantitatively reflected fluctuation, the situation of change of AC supply voltage linearly.When supply voltage when 220V rises to 253V, VD also rises to 4.6V thereupon.Because A3, A4 all are in the open loop magnifying state, it is high to gain, and has extremely strong positive feedback effect, so the output current potential of amplifier depends on the ratio of the height of two input current potentials fully.If promptly Ci Shi amplifier homophase current potential is higher than the backward end current potential, then the output current potential is the high level one state; If the in-phase end current potential is lower than the end of oppisite phase current potential, then the output current potential is low level " a 0 " attitude.Therefore, in this circuit, when VD be in+4.6V and 3.2V between the time, other drawn 0/1 symbol of A3 and A4 output represents that promptly " normality output current potential is low level 0 attitude.When VD voltage rose to greater than the about 10mV of 4.6V, A3 output current potential was that electric electronegative potential " 0 " attitude rises to the high potential one state, backward the voltage of level output pact+12V.In like manner, when VD voltage dropped to less than 3.2V, A4 output current potential rose to the high potential one state by electronegative potential " 0 " attitude at once, backward the direct voltage of level output pact+12V.Here VD has reflected in fact that greater than 4.6V AC supply voltage rises to more than the 253V.Equally, in fact VD has reflected that ac output voltage has been lower than 176V during less than 3.2V.Therefore, as long as AC supply voltage changes with interior fluctuation in aforementioned range, the window voltage of being made up of A3 and A4 detects, comparison circuit will outwards not exported high potential signal.And when supply voltage becomes " overvoltage " or " under-voltage " scope by above-mentioned " normally " numerical value, this circuit all with approximately+direct voltage of 12V, outwards export the high level drive signal.At the output of amplifier A3 and A4, all be connected to two-way load " one tunnel inverter of forming by BG2 and BG3 25 and back " the voltage fluctuation display circuit 27 formed of cathode red and green color light-emitting diode DZ2 altogether.Diode OR gate that another road load then is made up of D2 and D3 and subsequent driving, executive circuit.When AC supply voltage during in aforementioned " normally " range values, A3 and A4 output are electronegative potential, so BG2 and BG3 are cut-off state, the collector electrode of two pipes is high potential, manages all simultaneously luminous so be connected on the dichromatic LED DZ2 inner two of its back.Under the cooperation control of current-limiting resistance R26 and R27, red, green bi-coloured light will fuse and be orange-yellow radiance, and this AC supply voltage that promptly shows input is " normally ".When supply voltage rises to 253V when above, A3 is an output high level voltage.This high level voltage also forces triode BG2 conducting by current-limiting resistance R24 except that forcing diode D2 conducting.The result of BG2 conducting will be that the green LED that is connected on collector electrode loses and drives current potential and put out.At this moment, the only surplus red luminotron of dichromatic LED DZ2 is still luminous.This represents that promptly supply voltage has entered " overvoltage " scope.In like manner, when supply voltage is lower than 176V, though the state when amplifier A3 keeps former " normally " is constant, no high potential output, but A4 is because the inverting input current potential is lower than as the current potential of the in-phase input end of lower limit benchmark to overturn, and the output current potential is by low and transition is high potential.The high level voltage of exporting with the same A4 of above-mentioned A3 upset also forces triode BG3 conducting by current-limiting resistance R25 except that forcing diode D3 conducting.To make after the BG3 conducting and only remain green light pipe among the red light emitting diodes DZ2 luminous.This represents that promptly AC-input voltage has been reduced to " under-voltage " scope.More than be in the utility model, the operation principle and the course of work of " tri coloured lantern " display power supply voltage status.
In addition, when supply voltage transfers " overvoltage or under-voltage " to by " normally ", behind the diode OR gate circuit of the high-potential voltage that amplifier A3 or A4 output produce via D2 and D3 composition, deliver to function and exempt K switch 4.If K4 is an on-state, then high-potential voltage enters in the RC delay circuit of being made up of R16 and C11 then, enters the trigger electrode of controllable silicon 3CT after 0.5 ~ 0.8 second time-delay again through D4.Controllable silicon 3CT so and conducting.The electric charge of storing in after the 3CT conducting among the C2 will be to electromagnet J discharge, the J adhesive, and the hook 9 on it is pulled, and makes moving contact on the plug-in strip lose spacing and is driven by reed, and final moving contact 6 separates with fixed contact 15, finishes automatic power-off protection.Then, if tri coloured lantern changes orange-yellow when radiance into by redness or green, can power again by the artificial hand lock of slippaging.
If it is off-state that function is exempted K switch 4, then voltage detecting and defencive function will be exempted, and preamble is existing to be told about.
Three, the detection of load current and demonstration
So-called " load current ", be meant here the single phase alternating current (A.C.) power consumption equipment be connected on the BN1 of power supply lead-out terminal of the present utility model and BN2 draw on (electric power) line the time total current sum that produced.For protection electrical equipment with high accuracy current-limiting function; the utility model is set: when load current is " being fully loaded with " in current limliting rated value 90 ~ 105% scopes; when load current during greater than current limliting rated value (surpass 105%); be " overload ": for load current current limliting rated value 120% above person; system is decided to be " heavily overload ", wherein is included in the overweight overload of rated value 200%, 300% (even higher).At this, be noted that especially: for power line, tool danger be not heavily to transship and overweight overload.Opposite with traditional concept, statistics shows repeatedly: to power line biggest threat and harm, also do not cause " light overload " that people pay attention to exactly! So the utility model is defined as load current current limliting rated value 105 ~ 120% " light overload ".This flap guarantees that with novel emphasis power line does not move under the state in " overload " (wherein yet comprising above-mentioned " light overload ").
For aforementioned " being fully loaded with " or " underloading " (even unloaded), utility model is only made state and is shown, need not to do power-off protection.And for " light overload " that reach current limliting rated value 105 ~ 120%, the utility model will be according to the size of overload quantity, gives the delay cut-off protection by when the width of cloth " oppositely characteristic " automatic high speed time constant, promptly we " anti-time limit characteristic " often said.Its operation principle of following brief introduction and the course of work.With the supply voltage detection type seemingly, form a window type voltage detecting and comparison circuit by operational amplifier A 1 and A2.The upper limit fiducial value of this circuit is+6.3V, and the lower limit fiducial value is+5.4V.When load current equaled specified cut-off current, magnetic ring coil H was force feed induced electricity and bridge rectifier ZL2, through after the rectification again through sending on the divider resistance of forming by R6 and R7 after the C8 filtering.Adjust R7 can be on dividing point G acquisitions+6V voltage, this voltage is the signal voltage of reflected load electric current variation, its 90% is+5.4V that its 105% is 6.3V.This two voltage promptly is above-mentioned upper and lower limit fiducial value.They are that direct-current working volts VCC by high stability obtains after tandem divider resistance R8, R9 and R10 dividing potential drop.When the input of A1 and A2 moved under this input voltage effect, its output all became the high potential one state, and this is the utility model and sets " being fully loaded with " state.Under the driving of output high potential, red and green color light-emitting diode DZ1 is red with sending simultaneously, the record two color light, from outside look orange-yellow radiance.Obviously, when load current increases by 5% by rated value, A1 and A2 signal input part voltage will rise to 6.3V by 6V.If load current continues to increase, the signal input part voltage of A1 and A2 will be greater than 6.3V.As above save the principle of saying, amplifier A1 will overturn this moment, and the output current potential is electronegative potential " a 0 " attitude by original high potential transition promptly.Therefore the green LED that is driven by A1 output high potential extinguishes.At this moment, because of A2 in-phase input end voltage still is higher than inverting input voltage, so the A2 operating state does not change, its output still is high potential, so the red light emitting diodes that is connected on thereafter still outwards sends red radiance.This shows that promptly load current is equal to or greater than rated value 105%, has entered " overload " state.Because A1 output current potential is by high step-down, green luminotron extinguishes in forcing DZ1, also can force original high potential to drive and the triode BG21 of conducting is transferred to by conducting and ending.Triode BG1 is a reverser 30, and the current potential of being exported by its collector electrode has just become high potential naturally, begins by isolating diode D1 to output stage controllable silicon 3CT output execution command.The high potential of this instruction will drive controllable silicon 3CT conducting equally after 0.5 ~ 0.8 second time-delay.The short time delay circuit of being made up of R16 and C11 is responsible for " continuation overload " difference that " of short duration accident short circuit metal " phenomenon and excessive electricity consumption cause is come.Add " the inverse time-lag circuit " introduced in this section, will make the utility model to " gently ", " weight " overload and suitable the treating with a certain discrimination of transience accidental short circuit energy in various degree, with effective protection.With say in the last joint the same: will make after the controllable silicon 3CT conducting and carry out electromagnet J1 adhesive, driving two-way plug-in strip J moving contact 6 then separates with fixed contact 15, finishes the power-off protection task.
In addition, when load current transfers " underloading " or " zero load " state to by " being fully loaded with ", the input terminal voltage of amplifier A1 and A2 will be dropped to below the 5.4V by 6V.Amplifier A2 will overturn this moment, and the output current potential will be an electronegative potential by original high potential transition altogether, thereby make the red light emitting diodes that is connected on thereafter lose driving and extinguish.Green light and is driven by its output high potential still because of the A1 state does not change in this moment dichromatic LED, and so still send green glow, this state is aforesaid " zero load or underloading ", shows so product is only made state, there is no power-off protection and reacts.
Four, executive circuit and other
When the utility model is in " abnormal condition ", can guarantee single phase alternating current (A.C.) is implemented power-off protection with equipment, and end effector is the single-phase two-way plug-in strip J of charged magnetic release 18.Its protection process and operation principle are all introduced in first-half, so repeat no more.Only " fault simulation takes place and self check " function makes a presentation below: at first the signal input part of amplifier A3 and A4 is connected to two key switch K2 and K3 in voltage detection circuit.Wherein K2 connects, and right to use resistance R 22 links to each other with power supply VCC; K3 connects, and resistance R 23 is linked to each other with ground.When ifs circuit is worked in normal condition, artificially by logical key switch K2, signal input part K2 point current potential will by on move to more than the 4.6V, A3 overturns at once.Say that by preamble corresponding reaction will take place for the display circuit 27 and the executive circuit that are connected on thereafter.Equally, if by logical K3, D point current potential will pulled down to below the 3.2V.A4 will overturn this moment, and make respective reaction and just know have fault not.
Equally, in " load current detects and display circuit ", also be provided with a key switch K1.Artificially promptly should simulate the correlated response of generation " overload " by logical this key, also knowing has fault not.
The two-way plug-in strip of being controlled by a positioning hanger is an end effector spare of the present utility model.Whether electric all power consumption equipments that it is controlling a building or a house get.And positioning hanger 9 is to connect with the moving armature 11 of magnetictrip 18.And magnetictrip 18 is controlled by current monitoring circuit and electric voltage observation circuit.These two observation circuits attach together on a U-shaped printed circuit board (PCB), can be made up of the integrated circuit of an electronic computer special use.In addition, except the control that is subjected to positioning hanger 9, it is controlled by the pressing plate 7 on the operating grip 8 also as the single-phase two-way plug-in strip J of end effector spare.Like this, on two positions of " pushing to " and " leaving behind ", can control the closure and the disjunction of this plug-in strip by manually-operated handle 8 artificially.
Claims (7)
1, intelligent high accuracy current limliting plug-in strip, form by operating part and control section, comprise reverse-blocking tetrode thyristor, magnetictrip and manual reset switch, it is characterized in that, control section is by rectification unit (19), voltage stabilizing circuit (23), voltage detection circuit (22), Nverter circuit (25), voltage fluctuation display (27), current sampling (20), rectification (24), voltage detecting and comparison circuit (28), reverser (30), load condition display (29), function is exempted switch (26) and is formed, wherein, control section and magnetictrip (18) and manual reset switch (17) are formed controlled plug-in strip.
2, intelligent high accuracy current limliting plug-in strip according to claim 1, it is characterized in that, voltage detection circuit (22) is formed a window type voltage detecting comparison circuit by operational amplifier A 3 and A4, and magnitude of voltage is upward to obtain after the dividing potential drop from divider resistance R19, the R20 of series connection and R21; The signal input part of this circuit is the connection point D of the inverting input of the in-phase input end of amplifier A3 and amplifier A4.
3, intelligent high accuracy current limliting plug-in strip according to claim 1, it is characterized in that, voltage detecting and comparison circuit (28) have adopted by operational amplifier A 1 and A2 forms a window type current detecting and comparison circuit, and the direct-current working volts VCC of the high stability of this circuit is the direct-current working volts that obtain after tandem divider resistance R8, R9 and R10 dividing potential drop.
4, intelligent high accuracy current limliting plug-in strip according to claim 1,
It is characterized in that load condition display (29) adopts red yellowish green trichromatism lamp driver load state display.
5, intelligent high accuracy current limliting plug-in strip according to claim 1, it is characterized in that, the manual reset switch of controlled plug-in strip (17) has adopted the two-way plug-in strip J that is controlled by a positioning hanger (9), positioning hanger (9) one ends connect with the electromagnet moving armature (11) of magnetictrip (18), electromagnet J1 is voltage detection circuit (25) and voltage detecting and the comparison circuit (28) that is controlled by control section, and the two-way plug-in strip J of the other end of positioning hanger (9) and its control connects.
6, intelligent high accuracy current limliting plug-in strip according to claim 5 is characterized in that positioning hanger (9) is furnished with manual operation handle (8).
7, intelligent high accuracy current limliting plug-in strip according to claim 6, it is characterized in that, magnetictrip (18) is by electromagnet coil (12), electromagnet moving armature (11), positioning hanger (10) is formed, magnetictrip (18) is on base, positioning hanger (10) connects manual operation handle (8), one end of positioning hanger (10) and electromagnet moving armature (11) connect, its other end and manual operation handle (8) connect, manual operation handle (8) cooperates with the two-way plug-in strip J that is subjected to its control by dress pressing plate (7) thereon, two moving contacts (6) of two-way plug-in strip J are fixed on the base by screw (10), two fixed contacts (15) directly are fixed on the base, the entity circuit of control section is contained on the printed circuit board (PCB) (5), printed circuit board (PCB) (5) is a U-shaped, in the U-shaped neutral gear of manual operation handle (8) dress printed circuit board (PCB) (5), and can do to cooperate with the moving contact (6) of its below two-way plug-in strip J, the bottom of manual operation handle (8) is installed on the base by bearing pin, the current sampling magnet ring (3) that coil H is housed is by passing joining the lead (4) that connects with external friendship source current line and being fixed on the base of it, on the base-mounted input wires terminals of lead (4) one ends (1), the other end of lead (4) and fixed contact (15) weldering connect, in addition, be connected to lead (4) respectively between two output wiring terminals (13) and two moving contacts (6), constitute electric channel, base is furnished with shell (2), four key switches (16) are housed on the shell (2), they are K1, K2, K3, K4, there is cable-through hole (14) below, side of shell 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00255885 CN2454892Y (en) | 2000-12-06 | 2000-12-06 | Intelligent high-precision current-limiting knife switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00255885 CN2454892Y (en) | 2000-12-06 | 2000-12-06 | Intelligent high-precision current-limiting knife switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2454892Y true CN2454892Y (en) | 2001-10-17 |
Family
ID=33612722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00255885 Expired - Fee Related CN2454892Y (en) | 2000-12-06 | 2000-12-06 | Intelligent high-precision current-limiting knife switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2454892Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623443A (en) * | 2017-09-05 | 2018-01-23 | 河南省大方重型机器有限公司 | Crane main switch voltage regulator circuit |
| CN114038716A (en) * | 2021-11-10 | 2022-02-11 | 国网新疆电力有限公司检修公司 | Pressing plate device for relay protection |
| CN115223826A (en) * | 2022-09-20 | 2022-10-21 | 国网山东省电力公司桓台县供电公司 | Alarm device capable of identifying fault at fixed point due to voltage fluctuation |
-
2000
- 2000-12-06 CN CN 00255885 patent/CN2454892Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107623443A (en) * | 2017-09-05 | 2018-01-23 | 河南省大方重型机器有限公司 | Crane main switch voltage regulator circuit |
| CN107623443B (en) * | 2017-09-05 | 2018-09-18 | 河南省大方重型机器有限公司 | Crane main switch voltage regulator circuit |
| CN114038716A (en) * | 2021-11-10 | 2022-02-11 | 国网新疆电力有限公司检修公司 | Pressing plate device for relay protection |
| CN114038716B (en) * | 2021-11-10 | 2023-05-09 | 国网新疆电力有限公司超高压分公司 | Pressing plate device for relay protection |
| CN115223826A (en) * | 2022-09-20 | 2022-10-21 | 国网山东省电力公司桓台县供电公司 | Alarm device capable of identifying fault at fixed point due to voltage fluctuation |
| CN115223826B (en) * | 2022-09-20 | 2023-03-10 | 国网山东省电力公司桓台县供电公司 | But alarm device of voltage fluctuation fixed point identification trouble |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |