CN2301788Y

CN2301788Y - Electronic controlled AC contactor

Info

Publication number: CN2301788Y
Application number: CN 97213798
Authority: CN
Inventors: 赵栓
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-09
Filing date: 1997-04-09
Publication date: 1998-12-23
Anticipated expiration: 2007-04-09

Abstract

The utility model discloses an electronic controlled AC contactor which comprises an outer shell, an electromagnetic coil JC, a movable contact, a fixed contact and an iron core which has no air gaps, and the utility model also comprises an electronic controller used for controlling the attraction and release of the contactor. The electronic controller is mainly composed of a bridge circuit, an attracting circuit, a single-pulse generating circuit and an energy storing release circuit. The attraction of the contactor is maintained by means of residual magnetism, and when the contactor is attracted, a coil has no current; when excess voltage, or power failure or over voltage occurs, the single-pulse generating circuit can generate signals to start up the release circuit. The utility model has the advantages of simple structure, currentless coil during working attraction, no noise, no vibration, power saving and correspondingly extended service life.

Description

The Electronic Control A.C. contactor

The utility model belongs to a kind of circuit control device, relates to a kind of Electronic Control A.C. contactor.

Present A.C. contactor mainly comprises solenoid, contact arc-extinguishing system, support, shell etc., and behind coil electricity, armature is inhaled, and the suction of solenoid overcomes antagonistic spring power, makes dynamic and static contact contact, and main circuit is connected; Behind coil blackout, armature and motion contact move under spring reaction power, make circuitry cuts.Main circuit is switched to the maintenance stage of disconnection, and coil is switched on all the time, and this just exists power consumption, noise and heating inevitably, and function needs to use with other protection electrical matching less.And generally contactor is spared the magnetic air gap of dispelling that leaves 0.12-0.25mm in order to overcome remanent magnetism on the iron core, its processing technology complexity, and cost is higher.

The purpose of this utility model provides a kind of economize on electricity, noiseless, reliable operation and the Electronic Control A.C. contactor of automatic protection functions is arranged.

The purpose of this utility model realizes by the following technical solutions: described A.C. contactor mainly comprises shell, solenoid, dynamic/static contact, armature iron core and be used for the control contactor adhesive, the electronic controller that discharges, iron core is the iron core of no air gap, electronic controller is mainly by the whole circuit DL of bridge-type, attraction circuit A, pulse generation circuit B and accumulation of energy discharge circuit and form, it has three lead-out wires, one lead-out wire connects the arbitrary end of AC power, one end of another lead-out wire and solenoid is connected, the other end of the 3rd lead-out wire and solenoid is connected, and is connected with the AC power other end.

Described attraction circuit A is by capacitor C 1, C2, C3, resistance R 1, R2, R3, R4, controllable silicon SCR 1, SCR2, voltage-stabiliser tube D2, D3 is formed by connecting, the positive pole of capacitor C 1 is connected with halfwave rectifier diode D1, negative pole connects power line, capacitor C 2 and voltage-stabiliser tube D3 parallel connection, resistance R 3 is in parallel with capacitor C 3, capacitor C 2 negative poles, voltage-stabiliser tube D3 positive pole, capacitor C 3 negative poles are connected with power supply with resistance R 3 one ends, voltage-stabiliser tube D3, the other end of capacitor C 2 is through resistance R 2 and capacitor C 3, after connecting, the other end of resistance R 3 connects the controllable silicon SCR 2 control utmost points, resistance R 4 one termination bridge circuit DL positive output ends, the positive pole of another termination capacitor C 2, resistance R 1 one termination capacitor C1 positive poles, the negative pole of the positive pole of another termination controllable silicon SCR 2 and voltage-stabiliser tube D2, the positive pole of voltage-stabiliser tube D2 connects the control utmost point of controllable silicon SCR 1, the positive pole of controllable silicon SCR 1 connects the end of solenoid JC, and negative pole connects power line, and controllable silicon SCR 2 negative poles connect controllable silicon SCR 1 negative pole.Through the AC signal after capacitor C 9 step-downs through after the diode D1 halfwave rectifier by after capacitor C 1 filtering, puncture the control utmost point that voltage-stabiliser tube D2 enters unidirectional controllable silicon S CR1 through resistance R 1, the SCR1 conducting that is triggered, coil JC gets electric, sets up the magnetic field adhesive, the bridge circuit electric current charges through 2 couples of C3 of resistance R again after resistance R 4, capacitor C 2, voltage-stabiliser tube D3 voltage stabilizing simultaneously, after delaying time about 0.1 second, controllable silicon SCR 2 conductings, voltage-stabiliser tube D2 ends, controllable silicon SCR 1 zero-crossing switching, coil losing electricity.Because the armature iron core does not have air gap, will keep remanent magnetism, contactor keeps adhesive by remanent magnetism, makes dynamic and static contact adhesive, the interchange main circuit conducting of controlling.

Described pulse generation circuit is mainly by capacitor C 4; C5; C7; semifixed resistor W1; W2; voltage-stabiliser tube D6; D7; D8; triode BG1; BG2 and pulse transformer E; resistance R 5; R6; R7; R8; R9 is formed by connecting; capacitor C 4 positive poles connect the output of bridge circuit DL; negative pole suspension ground connection; semifixed resistor W1; W2 series connection back and capacitor C 4 parallel connections; click-through is crossed the base stage composition negative pressure that voltage-stabiliser tube D7 meets triode BG1 in the middle of the semifixed resistor W2; the power cut signal circuit; the collector electrode of triode BG1 is connected with voltage stabilizing didoe D8 negative pole by resistance R 6; the collector electrode of triode BG1 is connected by the base stage of capacitor C 5 and triode BG2; the collector electrode of triode BG2 is connected with the elementary of pulse transformer E; the secondary two ends of a pulse transformer E capacitor C 6 in parallel; capacitor C 7 and resistance R 7 parallel connections; one termination transformer E's of its parallel connection is elementary, another termination voltage-stabiliser tube D8 negative pole, and semifixed resistor W1 connects to form the overvoltage protection signal circuit by the base stage of voltage-stabiliser tube D6 and triode BG2.When overvoltage, under-voltage, power-off signal, triode BG2 is by by becoming conducting, and power cathode charges to capacitor C 7 by triode BG2 pulse transformer E is elementary, and level forms trigger impulse secondarily.

Described accumulation of energy discharges circuit by resistance R 10, R11, diode D4, D5, controllable silicon SCR 3 and capacitor C 8 are formed by connecting, resistance R 10 1 terminations and controllable silicon SCR 1 negative pole are connected AC power one end, the positive pole of another terminating diode D4, the negative pole of diode D4 connects the positive pole of capacitor C 8, be connected with the AC power other end by capacitor C 8, diode D5 negative pole connects the positive pole of capacitor C 8, diode D5 positive pole connects the positive pole of controllable silicon SCR 1 and the negative pole of controllable silicon SCR 3, resistance R 11 1 termination capacitor C8 positive poles, the positive pole of another termination controllable silicon SCR 3, the secondary end of the negative pole of controllable silicon SCR 3 and pulse transformer E is connected, and the control utmost point of controllable silicon SCR 3 connects the secondary other end of transformer E.When the controllable silicon SCR 3 control utmost points obtain the triggering signal conducting of impulse circuit, charging capacitor C8 produces counter magnetic field through resistance R 11,3 pairs of solenoids discharges of controllable silicon SCR, offsets remanent magnetism, and contactor is discharged in spring reaction power, cuts off whole main alternating current circuit.

Armature iron core of the present utility model utilizes the adhesive of remanent magnetism hold-in winding with no air-gap iron core, and in this maintenance stage, coil is not charged, so coil does not generate heat, noiseless, friction, and can prolong its useful life.Adopt no air-gap iron core, get final product with general low charcoal steel, manufacture craft is less demanding, but the save silicon steel disc reduces the iron core cost greatly.Described electronic control part has superpressure, under-voltage, outage automatic protection functions; reliable operation, action is accurate, and it is simple to operate, easy to use; can with common contactor compatible exchange, be specially adapted to connect continually at a distance and exchange main circuit and big volume controlled circuit with disjunction.

Below in conjunction with accompanying drawing the utility model is further described:

Fig. 1 is electronic controller of the present utility model and contactor coil connection diagram.

Fig. 2 is electronic controller circuit theory diagrams of the present utility model.

The utility model mainly is made up of shell, solenoid, iron core, dynamic/static contact etc., it also comprises an electronic control part, as shown in Figure 1, TA, QA are push-button switch, and JC1 is the contactor normally opened contact, and electronic control part DK has three lead-out wires, lead-out wire 1 connects AC power one end, lead-out wire 2 links to each other with contactor coil JC one end lead-in wire a1, and lead-out wire 3 links to each other with coil JC other end lead-in wire a2, and is connected with another root power line.

The iron core of described A.C. contactor, only need get final product the air gap of the iron core of common A.C. contactor and the iron core of the no air gap of short-circuited conducting sleeve cancellation becoming.

Electronic controller as shown in Figure 2 mainly discharges circuit by bridge circuit rectification DL, attraction circuit A (frame of broken lines A), pulse generation circuit B (frame of broken lines B) and accumulation of energy and forms.

Attraction circuit A is by capacitor C 1, C2, C3, resistance R 1, R2, R3, R4, and controllable silicon SCR 1, SCR2, voltage-stabiliser tube D2, D3 are formed by connecting.The AC signal output through the pulsating direct current of diode D1 halfwave rectifier after capacitor C 1 filtering, puncture voltage-stabiliser tube D2 through resistance R 1, enter the control board of unidirectional controllable silicon S CR1, controllable silicon SCR 1 conducting that is triggered, alternating current is gone into coil JC and is set up the magnetic field adhesive through the halfwave rectifier of controllable silicon SCR 1 is laggard, meanwhile, d point electric current is through resistance R 4, capacitor C 2, charge through 2 pairs of capacitor C of resistance R 3 again after the voltage-stabiliser tube D3 voltage stabilizing, capacitor C 3 positive poles extremely link to each other with controllable silicon SCR 2 controls, when being charged to the triggering threshold values of controllable silicon SCR 2, (delay time about 0.1 second), controllable silicon SCR 2 conductings, with controllable silicon SCR 1 triggering signal short circuit, voltage-stabiliser tube D2 ends, controllable silicon SCR 1 zero-crossing switching, coil JC dead electricity, contactor keeps adhesive by remanent magnetism.

Described accumulation of energy discharges circuit by resistance R 10, R11, diode D4, D5, and controllable silicon SCR 3 and capacitor C 8 are formed by connecting.When the energising adhesive, the afterflow that coil JC produces stores away energy through 8 chargings of 5 pairs of capacitor C of sustained diode, uses for discharging.Electric current provides Lian electric current for capacitor C 8 through resistance R 10, diode D4, to offset the electric leakage naturally of capacitor C 8.During release, the controllable silicon SCR 3 control utmost points obtain the triggering signal conducting, and energy storage capacitor C8 produces counter magnetic field through resistance R 11,3 pairs of coil JC discharges of controllable silicon SCR, offsets remanent magnetism, and contactor is discharged under spring reaction power.The triggering signal of controllable silicon SCR 3 is provided by pulse generation circuit.

Described pulse generation circuit mainly provides overvoltage; under-voltage and power-off signal; it is by capacitor C 4; C5; C7; semifixed resistor W1; W2; pulse transformer E; voltage-stabiliser tube D6; D7; triode BG1; BG2 and peripheral resistance are formed by connecting; pulse generation circuit is powered by bridge circuit DL; semifixed resistor W1 wherein; resistance D6 forms overvoltage crowbar; semifixed resistor W2; resistance D7 forms under-voltage; the power cut signal circuit; voltage-stabiliser tube D6 is operated in by pressing; voltage-stabiliser tube D7 is operated in yield pressure; semifixed resistor W1; W2 is a sample circuit; when line voltage is crossed low or have a power failure (comprise and press stop button or grid power blackout); semifixed resistor W2 center head voltage reduces rapidly; voltage-stabiliser tube D7 is become by conducting and ends; triode BG1 is entered by conducting and ends; signal is coupled to triode BG2 base stage through capacitor C 5; triode BG2 becomes conducting by ending; the electric current negative pole is by triode BG2; pulse transformer E is elementary to charge to capacitor C 7; secondary formation pulse at pulse transformer E adds to the controllable silicon SCR 3 control utmost points, finishes release movement.When too high, voltage-stabiliser tube D6 punctures as line voltage, and triode BG2 obtains signal conduction equally, adds to the SCR3 control utmost point in the secondary formation pulse of transformer E, finishes release movement.When having a power failure, the energy of pulse is by capacitor C 4 supplies.

Claims

1, a kind of Electronic Control A.C. contactor, mainly comprise shell, solenoid bore, the sound contact, iron core, it is characterized in that: iron core is no air-gap iron core, described contactor comprises that also is used for a control contactor adhesive, the electronic controller that discharges, it is mainly by bridge circuit DL, attraction circuit A, pulse generation circuit B and accumulation of energy discharge circuit and form, it has three lead-out wires, lead-out wire (1) connects AC power one end, lead-out wire (3) links to each other with contactor coil JC one end lead-in wire a1, and lead-out wire (2) links to each other with coil JC other end lead-in wire a2 and is connected with another root AC power cord.

2, Electronic Control A.C. contactor according to claim 1, it is characterized in that: described attraction circuit A is by capacitor C 1, C2, C3, resistance R 1, R2, R3, R4, controllable silicon SCR 1, SCR2, voltage-stabiliser tube D2, D3 is formed by connecting, the positive pole of capacitor C 1 is connected with halfwave rectifier diode D1, negative pole connects power line, capacitor C 2 and voltage-stabiliser tube D3 parallel connection, resistance R 3 is in parallel with capacitor C 3, capacitor C 2 negative poles, voltage-stabiliser tube D3 positive pole, capacitor C 3 negative poles are connected with power supply with resistance R 3 one ends, voltage-stabiliser tube D3, the other end of capacitor C 2 is through resistance R 2 and capacitor C 3, after connecting, the other end of resistance R 3 connects the controllable silicon SCR 2 control utmost points, resistance R 4 one termination bridge circuit DL positive output ends, the positive pole of another termination capacitor C 2; Resistance R 1 one termination capacitor C1 positive poles, the negative pole of the positive pole of another termination controllable silicon SCR 2 and voltage-stabiliser tube D2, the positive pole of voltage-stabiliser tube D2 connect the control utmost point of controllable silicon SCR 1, and the positive pole of controllable silicon SCR 1 connects the end of solenoid JC, negative pole connects power line, and controllable silicon SCR 2 negative poles connect controllable silicon SCR 1 negative pole.

3; Electronic Control A.C. contactor according to claim 1; it is characterized in that: described pulse generation circuit is mainly by capacitor C 4; C5; C7; semifixed resistor W1; W2; voltage-stabiliser tube D6; D7; D8; triode BG1; BG2 and pulse transformer E; resistance R 5; R6; R7; R8; R9 is formed by connecting; capacitor C 4 positive poles connect the output of bridge circuit DL; negative pole suspension ground connection; semifixed resistor W1; W2 series connection back and capacitor C 4 parallel connections; click-through is crossed the base stage composition negative pressure that voltage-stabiliser tube D7 meets triode BG1 in the middle of the semifixed resistor W2; the power cut signal circuit; the collector electrode of triode BG1 is connected with voltage stabilizing didoe D8 negative pole by resistance R 6; the collector electrode of triode BG1 is connected by the base stage of capacitor C 5 and triode BG2; the collector electrode of triode BG2 is connected with the elementary of pulse transformer E; the secondary two ends of a pulse transformer E capacitor C 6 in parallel; capacitor C 7 and resistance R 7 parallel connections; one termination transformer E's of its parallel connection is elementary; another termination voltage-stabiliser tube D8 negative pole, semifixed resistor W1 connects to form the overvoltage protection signal circuit by the base stage of voltage-stabiliser tube D6 and triode BG2.

4, Electronic Control A.C. contactor according to claim 1, it is characterized in that: described accumulation of energy discharges circuit by resistance R 10, R11, diode D4, D5, controllable silicon SCR 3 and capacitor C 8 are formed by connecting, resistance R 10 1 terminations and controllable silicon SCR 1 negative pole are connected AC power one end, the positive pole of another terminating diode D4, the negative pole of diode D4 connects the positive pole of capacitor C 8, be connected with the AC power other end by capacitor C 8, diode D5 negative pole connects the positive pole of capacitor C 8, diode D5 positive pole connects the positive pole of controllable silicon SCR 1 and the negative pole of controllable silicon SCR 3, resistance R 11 1 termination capacitor C8 positive poles, the positive pole of another termination controllable silicon SCR 3, the secondary end of the negative pole of controllable silicon SCR 3 and pulse transformer E is connected, and the control utmost point of controllable silicon SCR 3 connects the secondary other end of transformer E.