CN1034096C

CN1034096C - Mult-functional universal contactor

Info

Publication number: CN1034096C
Application number: CN92114900A
Authority: CN
Inventors: 张世兴
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-12-17
Filing date: 1992-12-17
Publication date: 1997-02-19
Anticipated expiration: 2007-12-17
Also published as: CN1088362A

Abstract

The present invention relates to a universal multifunctional contactor which is characterized in that three current detecting rings are respectively sheathed on three leading wires on the load side of the main contact head of the contactor to be matched with an electronic circuit to carry out short circuit protection, overcurrent protection or overload protection; the electronic circuit directly monitors the voltage of an operating wire to carry out voltage loss protection, undervoltage protection and overvoltage protection, and directly monitors a three-phase power supply on the load side to carry out phase fault detection. An auxiliary terminal B4 is led into the electronic circuit to be used for electric leakage protection, and the electronic circuit has various detecting, calculating and controlling functions; the purposes of electricity saving and operation without noise can be realized by a maintaining mode of direct current attraction and pulse width modulation. A wiring mode is compatible with an original contactor, and various protecting and controlling functions of time, counting, temperature, flame, pressure, etc. can be expanded through an expansion socket.

Description

Mult-functional universal contactor

The invention belongs to low-voltage electrical apparatus and electronic instrument field,

Domestic production at present; the contactor that uses; be six mostly; the old product of the seventies; not only power consumption is bigger; and function singleness; external and the installation current relay of palpus during extended function; voltage relay; the time relay; hot protective relay; multiple low voltage component such as open phase protector and earth leakage protective device etc.; not only make the wiring complexity; take a large amount of card installing spaces; and the various analog quantitys of very difficult directly acquisition; the protection of physical quantity and controlled function; though several economize on electricity contactors are arranged in recent years; motor protecters etc. are come out one after another; but function is imperfection still, and versatility is not strong, and does not have expanded function ability flexibly; DQ type electronic contactor had been released in Dalian in 1991; though more defencive function is also arranged, because complex structure; involve great expense and difficultly accepted, thereby limited promoting the use of of it by the user.

The purpose of the invention is under the condition that keeps former contactor basic function and two terminated line modes; adopt detection of electrons; the technological means that logical operation and Electronic Control etc. are advanced; merge original electromagnetic mechanism and create low-power consumption of new generation; noiselessness; multi-functional and extendible new contactor; reduce the kind of attached electric elements; make contactor self have overvoltage; under-voltage; o-volt protection; having short circuit protects fast; overcurrent; overload; phase shortage and creepage protection function; as long as above-mentioned arbitrary state takes place; this contactor discharges automatically; cut off load power source; the accident that prevents takes place; this device also has expansion interface, and makes socket type, and the stabilized voltage power supply Vcc that uses for expanded circuit is arranged in the socket CZ; on extended terminal S8 and the earth terminal; can make things convenient for by expansion interface, expansion regularly neatly; counting; pressure; temperature; flame; the defencive function circuit of various physical quantitys such as liquid level.

The principle of the invention (seeing accompanying drawing 1), through stopping button TA, the control power supply that starting button QA and self-locking contact M1 come is connected in the input of electronic circuit, it is the positive pole of diode D1, the negative pole of D1 connects the collector electrode of triode T1, filter capacitor C1 and resistance R 1, R4, through resistance R 4 current limlitings, the power supply of voltage-stabiliser tube DW2 voltage stabilizing is by the operating current Vcc of capacitor C 3 filtering as electronic circuit, the Vcc power supply removes and is integrated circuit (IC) 1, IC2, IC3 and expanded circuit provide outside the working power, also with resistance R 41, R42, R44, R27, R22, R17, Rc and potentiometer W2 connect, be biasing circuit and drive circuitry, behind the control power connection, electronic circuit promptly gets electric work, when each testing circuit and expanded circuit do not have abnormal signal, export 1 level with door IC2, transistor T 3 conductings, make also conducting of T4 through photoelectrical coupler, simultaneously owing to transfer delayed startup capacitor C 11 chargings of stretch circuit IC3 to come predetermined value, so transistor T 5 ends, transfer stretch circuit IC3 to export 0 level, promoting pipe T2 ends, the base stage of switch transistor T 1 provides biasing and conducting by resistance R 1, make the DC high-voltage power supply after the diode D1 rectification all be loaded into coil M through the emitter of switch transistor T 1, for coil M provides enough power, make the rapid adhesive of contactor, after the contactor adhesive, along with capacitor C 11 charging processes knot speed, voltage-stabiliser tube DW1 conducting when the current potential on the C11 surpasses the puncture voltage of voltage-stabiliser tube DW1, the Vcc power supply provides biasing through resistance R 42 and voltage-stabiliser tube DW1 for transistor T 5, make its conducting, transfer stretch circuit IC3 to enter oscillatory regime, the widened pulse of its output, promote to amplify by resistance R 2 base stage of 1 from the collector coupled to the switch transistor T through transistor T 2, switch transistor T 1 is transferred to by the work of widened pulse switch by saturation conduction, select suitable duty ratio, make coil M after the contactor adhesive, keep the adhesive of contactor with lower average power consumption, to obtain higher power savings, widened pulse is made up of integrated circuit (IC) 3 and peripheral circuits, IC3 is a slice 7555CMOS time-base circuit, its 4,8 pin connect power Vcc, 1 pin ground connection, 3 pin connect the base stage of transistor T 2 through

resistance R

3,7 pin meet Vcc through resistance R 44, there is pipe D21 to connect 1 end of potentiometer W1 through reversal connection two, through just connecing 6 pin and 2 pin and the capacitor C 2 that diode D20 and series resistance R40 meet the mid point 2 termination IC3 of potentiometer W1, the other end of capacitor C 2 is through collection one emitter grounding of transistor T 5, the collector electrode of T5 also connects the Vcc power supply through resistance R 41, in addition for preventing that coil M iron core when the pulse power supply from producing shake, be connected to filter capacitor C12 at the emitter of switch transistor T t.Pulse-width modulation circuit can use other modulation circuit such as CW3524, CW494 to constitute.

Logical operation is by eight inputs and door integrated circuit (IC) 2, transistor T 3 grades constitute NAND operation and photoelectrical coupler drives, each input S1～S8 connects the output of over-voltage detection circuit IC1a respectively, load side main contact A, B, C three-phase phase shortage detects output, the output of short circuit fast detecting IC circuit 1b. overcurrent, the output of overload detection circuit IC1c, the output of electric-leakage detection circuit IC1d, and the output F2 of expanded circuit, when the output of each testing circuit just often (1 level), with the output of door IC2 also be 1 level, be coupled to the base stage of transistor T 3 through resistance R 26, make the T3 conducting, photoelectrical coupler GD work, transistor T 4 conductings, DC power supply flows through solenoid M through T4, make the contactor adhesive, when arbitrary testing circuit was output as 0, exporting with door IC2 also was 0, transistor T 3 ends, photoelectrical coupler GD closes, and transistor T 4 ends, and contactor discharges.Each testing circuit work is as follows, over-voltage detection circuit is made up of comparator IC1a etc., DC power supply connects the end of oppisite phase of comparator IC1a after by resistance R 9, R8 dividing potential drop, the reference level of Vcc power supply dividing potential drop is compared by resistance R 6, R7 with in-phase end, when overvoltage, the end of oppisite phase level is greater than the in-phase end level, and comparator IC1a output is 0 level, and contactor discharges.Phase shortage detects A, B, the rectification of C three phase mains up-sampling that is connected in contactor load side main contact by the positive pole of diode D9, D10, D11 respectively, rectification output is respectively through resistance R 10, R11, R12, R13, meet input S2, S3, S4 after R14, the R15 dividing potential drop with door IC2, during phase shortage, corresponding dividing potential drop is output as 0 level, and contactor discharges.The detection signal of short circuit, overcurrent or overload is all taken from three-phase current detection ring LA, LB, LC through diode D12, D13, D14 rectification and capacitor C 5 filtered current signals, short-circuit detecting is connected in current signal by resistance R 16 and capacitor C 10 parallel connections the end of oppisite phase of comparator IC1b, in-phase end obtains reference level by resistance R 17, R18 to the power Vcc dividing potential drop, the output of comparator IC1b be connected on the door IC2 input S5 on, IC1b is output as 0 level during short circuit, and contactor discharges.Overcurrent, overload detection circuit is made of comparator IC1c etc., through capacitor C 5 filtered current signals by resistance R 20, potentiometer W1 connects the end of oppisite phase of comparator IC1c, compare by the adjustable reference level of potentiometer W2 mid point with in-phase end and to finish over-current detection, overload detection then is to insert integrating capacitor C4 and constitute through K switch Z at the end of oppisite phase of over-current detection circuit IC1c, delay voltage time when adjustment potentiometer W1 can adjust overload, because the W2 two ends connect power Vcc and ground respectively, the current value of overcurrent or overload so adjustment W2 can adjust, the IC1c output is 0 level when overcurrent or overload, and contactor discharges.Electric-leakage detection circuit is made of comparator IC1d etc., in-phase end is set up reference level by resistance R 22, R23 to the power Vcc dividing potential drop, electric leakage signal is introduced by terminal B4, after resistance R 25, R24 dividing potential drop, connect in-phase end through reversal connection diode D7 respectively, connect end of oppisite phase through just meeting diode D8, when the AC and DC signal of electric leakage made the end of oppisite phase level greater than reference level, comparator IC1d exported 0 level, and contactor discharges.Extension socket by with the input S8 of door IC2; constitute on stabilized voltage power supply Vcc and the earth terminal; expanded circuit is by the F1 of expansion plug CT; the F3 terminal is connected the Vcc working power that extension socket CZ provides; and the output of expanded circuit is connected in extension socket by the F2 terminal of plug CT; on the S8 terminal of CZ; thereby realization expanded function; circuit in the time of can setting in the expansion plug; counting circuit; temperature control; pressure control; liquid level control; a series of detections such as flame monitoring; protective circuit; when various expanded circuits make the S8 terminal 0 level occur; contactor will discharge automatically; various expanded circuits are made the expansion plug of difference in functionality; insert extension socket CZ when needing expansion and can obtain function corresponding; very convenient; flexibly; various defencive function of the present utility model can be as option; press contactor; relay; the needs of the automatic element of various electromagnetism such as electromagnet are selected flexibly; be adapted at implementing on the big and small automatic element of various electromagnetism; versatility is extremely strong; current detecting ring of the present utility model is made of three corresponding secondary winding of magnetic guiding loop coiling respectively; a winding is three lead-in wires of load side main contact; detection ring can device becomes one with connecing

Accompanying drawing

2,3 is seen in the use wiring of multi-functional contactor; it has 4 binding post B1, B2, B3, B4; terminal B1 connects control power supply phase line; B3 connects center line ground; B2 is at the control power supply when being 220V and the B3 short circuit; connect another phase line when controlling power supply for 380V, B4 is the detection of electrical leakage terminal, generally connects the protective earthing terminal or the shell of equipment.

The invention and common contactor are relatively; except that keeping original under-voltage, o-volt protection function; it is general to have power of alterating and direct current; realize kinds of protect functions such as overvoltage protection, open-phase protection, short-circuit protection, overcurrent, overload protection, earth leakage protective with detection of electrons, computing, control technology; can expand regularly counting by extension socket.The circuit of multiple useful functions such as pressure, temperature, liquid level, flame.Because this contactor has omnibearing defencive function and expanded function flexibly; therefore use this contactor can save multiple low-voltage electrical apparatuses such as air circuit, voltage relay, current relay, thermal relay, phase failure protector, earth leakage protective device; expanded function by this contactor can also be saved the time relay; counting relay; pressure switch, temperature relay, fluid level controller; flame eye, a series of special protection electrical equipment such as smog protection controller.This contactor is operated in a kind of direct current adhesive; the working operating mode that DC decompression is kept; therefore the more common A.C. contactor of this contactor has noiseless; the operation characteristic of economize on electricity; with coupling type; little power consumption formula contactor relatively has wiring simple; do not change former logic characteristics; compare with the contactor energy-saving coil; more there is function many and can expand physical quantity control; the ability of protection; introduce French T E series and obtain the international contactor that authenticates relatively with sky and water electrical apparatus factory; have multi-functional; extendible characteristics; and expanded function and various defencive function be electronization all; thereby volume is little; the reliability height; even the still configurable multi-function device of the present utility model of the product of T E series and the index of its original product and performance are improved a step again; this contactor compares its defencive function basically identical with the DQ series electronic contactor in Dalian; but expanded function shows unique characteristics; and at big electric current; the anti-overload ability aspect also be DQ series can't be obtained; from this device materials of cost cost cost tens yuans only, add that former contactor departmental cost also only is ten minutes of DQ series same specification.Use the automatic element of electromagnetism such as contactor of the invention; can save a large amount of adding electric elements; as the time relay; thermal relay etc.; save the card space; reduced volume; do not need special heat radiation etc.; because electronic control system of the present utility model can be made an individual components separately, thereby not only be suitable for new contactor; relays etc. are made whole multifunctional electric appliance, also are fit to very much to make a general electronic corporation separately and cooperate old product to renovate; the various functions of this device can be selected by manufactory; also can be selected by wiring by the user, this device can replace various motor protecters fully, as the product of Cangnan, Zhejiang.

An embodiment to the invention is described in further detail below in conjunction with accompanying drawing.

Fig. 1: circuit system schematic diagram

Fig. 2: the use winding diagram after implementing on CJ020～CJ040

Fig. 3: the structure chart of on CJ020,40, implementing

Fig. 4: the structure chart of expansion plug

Fig. 5: timer schematic diagram

Fig. 6: temperature control principle figure

Fig. 7: flame monitoring circuit diagram

Fig. 8: analyzing logic control block diagram

The best implementing method of the invention be by contactor factory directly produce have multi-functional, the contactor of extendible integrated general structure, promptly when making the said goods, directly produce the current detecting ring, extension socket and electronic system, electronic system should manufacture an application-specific integrated circuit (ASIC) IC, with improve reliability, reduce cost, reduced volume.

Now a kind of embodiment is illustrated, see accompanying drawing 1～8

Implementation is as follows: be example with CJ0-40, contactor load side main contact lead-in wire is curved Shape, straight section is inserted in corresponding current detecting ring respectively in the middle, the current detecting ring is that the secondary winding that is wound with the corresponding number of turn on ferrite bead constitutes, a winding is the lead-in wire of contactor load side, for preventing that secondary winding from may produce high pressure, respectively at secondary winding two ends parallel resistance R30, R31, R32, electronic control system can be placed on the space in the contactor shell, the control power supply is through stopping button TA, starting button QA meets electronic circuit input terminal B1, connect the positive pole of diode D1 through the B1 terminal, the negative pole of D1 connects the collector electrode of triode T1, filter capacitor C1 and resistance R 1, R4, through resistance R 4 current limlitings, the power supply of voltage-stabiliser tube DW2 voltage stabilizing is by the working power Vcc of capacitor C 3 filtering as electronic circuit, the Vcc power supply removes and is integrated circuit (IC) 1, IC2, IC3 and expanded circuit provide outside the working power, also with resistance R 41, R42, R44, R27, R22, R17, R6 and potentiometer W2 connect, be biasing circuit and drive circuitry, behind the control power connection, electronic circuit promptly gets electric work, when each testing circuit and expanded circuit do not have abnormal signal, export 1 level with door IC2, transistor T 3 conductings, make also conducting of T4 through photoelectrical coupler, simultaneously owing to transfer delayed startup capacitor C 11 chargings of stretch circuit IC3 not arrive predetermined value, so transistor T 5 ends, transfer stretch circuit IC3 to export 0 level, promoting pipe T2 ends, the base stage of switch transistor T 1 provides biasing and conducting by resistance R 1, make the DC high-voltage power supply after the diode D1 rectification all be loaded into coil M through the emitter of switch transistor T 1, for coil M provides enough power, make the rapid adhesive of contactor, after the contactor adhesive, along with capacitor C 11 charging processes knot speed, voltage-stabiliser tube DW1 provided biasing for transistor T 5 when the current potential on the capacitor C 11 surpassed the puncture voltage of voltage-stabiliser tube DW1, make it saturated, pulse width modulation circuit IC3 enters oscillatory regime, the widened pulse of its output, promote to amplify by resistance R 2 base stage of 1 from the collector coupled to the switch transistor T through transistor T 2, switch transistor T 1 is transferred to by the work of widened pulse switch by saturation conduction, select suitable duty ratio, make coil M after the contactor adhesive, keep the adhesive of contactor with lower average power consumption, to obtain higher power savings, widened pulse is made up of integrated circuit (IC) 3 and peripheral circuits, IC3 is a slice 7555CMOS time-base circuit, its 4,8 pin connect power Vcc, 1 pin ground connection, 3 pin connect the base stage of transistor T 2 through

resistance R

3,7 pin meet Vcc through resistance R 44, connect 1 end of potentiometer W1 through crimping diode D21, through just connecing 3 ends that diode D20 and series resistance R40 meet potentiometer W1,6 pin of W1 mid point 2 termination IC3 and 2 pin and capacitor C 2, the other end of capacitor C 2 is through the C of transistor T 5, E ties ground connection, the collector electrode of T5 also connects the VCC power supply through resistance R 41, be connected to filter capacitor C12 at the switching tube emitter in addition, to prevent the iron core shake.

Logical operation by with door IC2, transistor T 3 grades constitute the driving of NAND operation and photoelectrical coupler, each input S1～S8 takes over the output of pressing testing circuit IC1a respectively, load side main contact A, B, C three-phase phase shortage detects the divider resistance output, the output of short circuit fast detecting IC circuit 1b, overcurrent, the output of overload detection circuit IC1c, the output of electric-leakage detection circuit IC1d, and the output F2 of expanded circuit, each testing circuit is just often exported is 1 level, with the output of door IC2 also be 1 level, be coupled to the base stage of inverter T3 through resistance R 26, make the T3 conducting, photoelectrical coupler GD work, transistor T 4 conductings, solenoid M gets, the contactor adhesive, when arbitrary testing circuit was output as 0, exporting with door also was 0 level, transistor T 3 ends, photoelectrical coupler GD no-output, transistor T 4 ends, and contactor discharges.Overvoltage detects by comparator IC1a etc. to be formed, and DC power supply connects comparator IC1a end of oppisite phase after by resistance R 9, R8 dividing potential drop, with in-phase end by resistance R 6, R7 relatively to the reference level of Vcc power supply dividing potential drop, IC1a was output as 0 when overvoltage took place, contactor discharges.Phase shortage detects A, B, the rectification of C three phase mains up-sampling that is connected on contactor load side main contact by the positive pole of diode D9, D10, D11 respectively, rectification output is respectively through resistance R 10, R11, R12, R13, connect input S2, S3, S4 after R14, the R15 dividing potential drop with door IC2, during phase shortage, corresponding dividing potential drop is output as 0, and contactor discharges.The detection signal of short circuit, overcurrent or overload is all taken from three-phase current detection ring LA, LB, LC through diode D12, D13, D14 rectification and capacitor C 5 filtered current signals, short-circuit detecting is connected in current signal by resistance R 16 and capacitor C 10 parallel connections the end of oppisite phase of comparator IC1b, in-phase end obtains reference level by resistance R 17, R18 to the power Vcc dividing potential drop, the output of IC1b connect with the door IC2 input S5 on, IC1b is output as 0 during short circuit, and contactor discharges.Also be connected on the end of oppisite phase of comparator IC1c through capacitor C 5 filtered current signals, compare by the current potential of potentiometer W2 mid point with in-phase end and finish over-current detection through resistance R 20, potentiometer W1.Overload detection is to insert integrating capacitor C4 at the end of oppisite phase of over-current detection circuit IC1c through K switch Z to constitute, adjust the delay voltage time that potentiometer W1 can adjust and transship, because the W2 two ends connect power Vcc and ground respectively, so adjust the reference level that W2 can change comparator IC1c, the current value of overcurrent or the overload of also promptly having adjusted, the output of IC1c is 0 level when overcurrent or overload, and contactor discharges.Electric-leakage detection circuit is made up of comparator IC1d etc., in-phase end is set up reference level by resistance R 22, R23 to Vcc power supply dividing potential drop, electric leakage signal is introduced by terminal B4, after resistance R 25, R24 dividing potential drop, connect the in-phase end of comparator IC1d respectively through the diode D7 of reversal connection, diode D8 through just connecing connects end of oppisite phase, when the AC and DC signal of electric leakage made the end of oppisite phase level greater than the in-phase end level, comparator IC 1d was output as O, and contactor discharges.Extension socket CZ by with the input S8 of door IC2; reaching socket box on stabilized voltage power supply Vcc and the earth terminal constitutes; expanded circuit in the expansion plug CT is by the F1 of plug CT; the F3 terminal is connected the Vcc working power that extension socket CZ provides; and the F2 terminal by plug CT is connected in S8 terminal in the socket CZ to the output of expanded circuit; thereby realization expanded function; the expansion plug is made regularly; counting; temperature control; pressure control; liquid level control; flame monitoring; various detections and protective circuits such as smog control; the plug of difference in functionality inserts extension socket and promptly obtains control corresponding and defencive function, and is very convenient

flexible.Accompanying drawing

2,3 is seen in the use wiring of present embodiment; it has 4 binding post B1, B2, B3 and B4, B1 to connect control power supply B3 ground connection; B2 connects another phase power supply when the control power supply is 380 volts; in the time of 220 volts and the B3 short circuit; B4 is the detection of electrical leakage terminal, generally connects the protective earthing terminal or the metal shell of equipment.

Claims

1, a kind of mult-functional universal contactor, detect control system by iron core, coil, contact, arc-extinguish chamber, armature and multifunction electronic and form, it is characterized in that:

The electromagnetism pull-in winding of a, contactor and first, second terminal (B that is connected on operation control power supply after first diode (D1), pulse-width modulation pipe (T1) and protection switch pipe (T4) are connected ₁, B ₂) on; the state of protection switch pipe (T4) is directly controlled in the output of multifunction electronic detection control system through photoelectrical coupler; pulse-width modulation pipe (T1) is subjected to pulse-width modulation circuit (IC3) control; this modulation circuit is that stretch circuit is transferred in a self-oscillation that powers on delayed startup; modulating tube when assurance powers on (T1) changes on off state over to by the conducting time-delay; the 3rd terminal (B3) is as earth terminal, for electronic control system provides reference potential

B, the multifunction electric sub-control system overvoltage signal power supply after by first diode (D1) rectification is through being added on behind the electric resistance partial pressure on the overvoltage comparator (IC1a), obtains and outputs to and door (IC after relatively with setting signal ₂) first input end (S1) on, default phase signal is taken from the negative He side main contact of contactor, respectively through (D9, D10, the D11) rectification of the second, the third and fourth two-utmost point pipe and deliver to behind electric resistance partial pressure and a door (IC ₂) second, third and four-input terminal (S ₂, S ₃, S ₄) on, short circuit, overcurrent, overload signal are obtained by three detection rings that are enclosed within on the contact, through the 5th, the 6th and the 7th diode (D ₁₂, D ₁₃, D ₁₄) after the rectification and after first resistance (R16) current limliting, meet short-circuit protection comparator (IC ₁B) output to after relatively on the 5th input (S5) with door (IC2) with set point, the signal behind the 5th, the 6th and the 7th diode rectification is also taken over stream comparator (IC through second resistance (W1, R20) ₁C) with set point relatively after; the over-current and-load signal be input to the door (IC2) the 6th input (S6); detection input at overcurrent comparator (ICIC) connects an integrating capacitor to ground through switch (KZ); switch (KZ) is the overcurrent protection state when disconnecting; when switch (KZ) is closed; electric capacity (C4) is formed integrating circuit with second resistance (R20, W1), realizes the overload protection of inverse time protection characteristic, comparator (IC ₁C) homophase set input connects sets potentiometer (W2) mid point; be used to set the set point of over-current and-load protection, attract the detection of electrical leakage signal by protection terminal (B4) and output to and a door (IC after relatively through connecing electric leakage comparator (IC1D) and duty setting signal after diode (D8) rectification ₂) the 7th input (S ₇) on, the working power of above-mentioned electronic circuit is taken from the first diode (D ₁) direct voltage after the rectification, after the 3rd resistance (R4) current limliting, voltage-stabiliser tube (DW2) voltage stabilizing as the working power of electronic circuit, this stabilized voltage power supply is with together introducing in the extension socket with the 8th input (S8) and the ground wire of door (IC2), as the bus of expanded circuit.

2, multi-functional contactor as claimed in claim 1 is characterized in that also comprising the interface of the spill extension socket that is positioned at described multi-functional contactor, is used for kinds of protect and controlled function such as extended temperature, pressure, liquid level timing, smog, flame.

3, multi-functional contactor as claimed in claim 1, electronic control system wherein is made of an application-specific integrated circuit (ASIC).