CN202150411U

CN202150411U - No-spark contactor control circuit

Info

Publication number: CN202150411U
Application number: CN201120263403U
Authority: CN
Inventors: 牛光峰
Original assignee: Zhengzhou Synthetic Diamond and Products Engineering Technology Research Center Co Ltd
Current assignee: Zhengzhou Synthetic Diamond and Products Engineering Technology Research Center Co Ltd
Priority date: 2011-07-25
Filing date: 2011-07-25
Publication date: 2012-02-22
Anticipated expiration: 2021-07-25

Abstract

The utility model discloses a no-spark contactor control circuit, comprising a coil of a contactor and a main contact of the contactor; wherein, the main contact of the contactor is in series between a power supply and a power supply input end of a motor. The no-spark contactor control circuit also comprises a three-phase AC solid state relay, and a time sequence control unit. The three-phase AC solid state relay is in parallel connections at the two ends of the main contact of the contactor, a first control signal input end and a second control signal input end of the three-phase AC solid state relay are connected with the output end of a rectification voltage stabilizing circuit, and the input end of the rectification voltage stabilizing circuit is connected with a first signal output end of the time sequence control unit and a ground wire, and the two ends of the coil of the contactor are connected with a second signal output end of the time sequence control unit and the ground wire separately. By using the no-spark contactor control circuit, not only the interference effects of an electric arc to the circuit can be eliminated, but also the damage effect of the electric arc to the contact of the contactor is eliminated, and the service life of a contactor circuit is prolonged substantially.

Description

A kind of no-spark contactor control circuit

Technical field

The utility model relates to the contactor in the control circuit, relates in particular to a kind of no-spark contactor control circuit.

Background technology

Contactor is an indispensable device in the control circuit, but contactor damages through regular meeting very much in the practical application, and the position that contactor damages often all is that main contacts burns, and the occasion performance that especially the big adhesive frequency of operating current is high is more obvious.The reason that the contactor main contacts burns often is exactly when contactor discharges, to produce electric arc, causes contact high temperature melt distortion, and contact resistance will become greatly, and causes that the contact site produces more heat, so just forms vicious circle.The electric arc that the contact produces during contactor work not only can disturb electronic product, causes electronic product performance unstable, also can the contact scorification be caused adhesion or distortion owing to electric arc has very high temperature, can cause a series of faults.If contactor does not have electric arc to produce when breaking off, then the life-span of contactor is very long.

The utility model content

The purpose of the utility model provides a kind of no-spark contactor control circuit, can eliminate electric arc the contact of contactor is damaged.

The utility model adopts following technical proposals: a kind of no-spark contactor control circuit; Comprise the coil of contactor and the main contacts of contactor; The main contacts of contactor is connected between the power input of power supply and motor; Also include 3 phase AC solid relay, timing control unit; The 3 phase AC solid relay is connected in parallel on the main contacts two ends of contactor; First signal input end of 3 phase AC solid relay is connected the output of regulator rectifier circuit with second signal input end, the input of regulator rectifier circuit is connected with ground wire with first signal output part of timing control unit, and the two ends of the coil of said contactor are connected with ground wire with the secondary signal output of timing control unit respectively.

Described regulator rectifier circuit comprises rectifier diode, resistance, electric capacity, voltage-stabiliser tube; The positive pole of rectifier diode connects first signal output part of timing control unit, connects first signal input end of 3 phase AC solid relay behind the negative pole series resistor; The electric capacity negative pole connects ground wire, anodal first signal input end that connects the 3 phase AC solid relay; The negative pole of voltage-stabiliser tube and anodal first signal input end and second signal input end that is connected the 3 phase AC solid relay respectively.

Timing control unit comprises CPU, first and second optical coupling isolation circuits, first and second relays; Two clock signal control ends of CPU are connected with coil one end of first and second relays through first and second optical coupling isolation circuits respectively; The coil other end of first and second relays connects power supply; The normally opened contact of first relay is connected between first control signal output ends and ground wire of timing control unit, and the normally opened contact of second relay is connected between second control signal output ends and ground wire of timing control unit.

The coil two ends of the coil of described first relay and second relay all are parallel with fly-wheel diode.

The utility model no-spark contactor control circuit is finished the work through contactor and 3 phase AC solid relay jointly; Because the characteristics of solid state relay are exactly when work, not have electric arc to produce, and can not produce electric field and disturb, solid-state relay is only just worked in contactor adhesive or release; Other period has only contactor work; And contactor does not have pressure drop in the two ends, contact when adhesive or when discharging, and can not produce electric arc, not only can eliminate the interference effect of electric arc to circuit; Also eliminated the damage effect of electric arc, prolonged the useful life of contactor circuit greatly contacts of contactor.

Description of drawings

Fig. 1 is the circuit diagram of contactor and three-phase alternating current solid state relay in the utility model;

Fig. 2 is the timing control unit circuit theory diagrams of the utility model.

Embodiment

As shown in Figure 1; The utility model no-spark contactor control circuit comprises the coil KM of contactor and main contacts U, V, the W of contactor; The main contacts U of contactor, V, W are connected between the power input of power supply (L1, L2, L3) and motor M; 3 phase AC solid relay SSR is connected in parallel on main contacts U, V, the W two ends of contactor; First signal input end (+) of 3 phase AC solid relay SSR is connected the output of regulator rectifier circuit with second signal input end (-); Wherein regulator rectifier circuit comprises rectifier diode D1, resistance R 1, capacitor C 1, voltage-stabiliser tube DW1, and the positive pole of rectifier diode D1 connects the first signal output part La of timing control unit, connects first signal input end (+) of 3 phase AC solid relay SSR behind the negative pole series resistor R1; Capacitor C 1 negative pole connects ground wire N, anodal first signal input end (+) that connects 3 phase AC solid relay SSR; The negative pole of voltage-stabiliser tube DW1 and anodal first signal input end (+) and second signal input end (-) that is connected 3 phase AC solid relay SSR respectively; The two ends of the coil KM of said contactor are connected with ground wire N with the secondary signal output Lb of timing control unit respectively.

As shown in Figure 2; Timing control unit comprises CPU U1 (AT89S52), the first and second optical coupling isolation circuit OPT1, OPT2, first and second relays; Two clock signal control ends of CPU U1 (pin 10 and pin 11) are connected with coil J1, J2 one end of first and second relays through the first and second optical coupling isolation circuit OPT1, OPT2 respectively; The coil J1 of first and second relays, the J2 other end connect power supply+12V; The normally opened contact K1 of first relay is connected between the first control signal output ends La and ground wire N of timing control unit, and the normally opened contact K 2 of second relay is connected between the second control signal output ends Lb and ground wire N of timing control unit.The coil J2 two ends of the coil J1 of wherein said first relay and second relay all are parallel with fly-wheel diode.

Like Fig. 1, shown in Figure 2, the major loop of the main contacts U of contactor, V, W and 3 phase AC solid relay SSR is in parallel, and contactor main contacts U, V, W adhesive or solid-state relay SSR conducting all can make motor M rotate.Between the first control signal output ends La of sequential control unit and N, add the 220V alternating voltage, solid-state relay SSR will conducting, the motor M running; When not having voltage between the second control signal output ends Lb of sequential control unit and the N, solid-state relay SSR has just ended, and motor M is out of service.When between Lb and the N alternating current 220V voltage being arranged, the main contacts U of contactor, V, W will adhesives, the motor M running, otherwise will discharge the motor M stall.Because the characteristics of solid state relay SSR are exactly when work, not have electric arc to produce; Can not produce electric field disturbs; The utility model utilizes the advantage of contactor and solid state relay, when contactor needs adhesive, lets solid-state relay SSR take the lead conducting; And the main contacts U of relief contactor, V, W adhesive then let solid-state relay SSR end again; At the main contacts U of contactor, V, when W need discharge, let the conducting of solid-state relay SSR elder generation, let main contacts U, V, the W of contactor discharge again, then let solid-state relay SSR end again.Sequence voltage was when timing control unit was given provide between La and Lb and the ground concrete: when motor M need be moved, add 220V voltage between La and the N, then add 220V voltage between Lb and the N, after contactor main contacts U, V, the W adhesive, add 0V between La and the N; When motor M need stop, adding 220V voltage between La and the N, then add 0V voltage between Lb and the N, after contactor main contacts U, V, the W adhesive, add 0V between La and the N and get final product.By the running order of contactor and solid-state relay, solid-state relay is only just worked in contactor adhesive or release, and other period has only contactor work; And contactor does not have pressure drop in the two ends, contact when adhesive or when discharging; Can not produce electric arc, comprehensively get off, not only can eliminate the interference effect of electric arc circuit; Also eliminated the damage effect of electric arc, prolonged the useful life of contactor circuit greatly contacts of contactor.

Claims

1. no-spark contactor control circuit; Comprise the coil of contactor and the main contacts of contactor; The main contacts of contactor is connected between the power input of power supply and motor; It is characterized in that: also include 3 phase AC solid relay, timing control unit; The 3 phase AC solid relay is connected in parallel on the main contacts two ends of contactor; First signal input end of 3 phase AC solid relay is connected the output of regulator rectifier circuit with second signal input end, the input of regulator rectifier circuit is connected with ground wire with first signal output part of timing control unit, and the two ends of the coil of said contactor are connected with ground wire with the secondary signal output of timing control unit respectively.

2. no-spark contactor control circuit according to claim 1; It is characterized in that: described regulator rectifier circuit comprises rectifier diode, resistance, electric capacity, voltage-stabiliser tube; The positive pole of rectifier diode connects first signal output part of timing control unit, connects first signal input end of 3 phase AC solid relay behind the negative pole series resistor; The electric capacity negative pole connects ground wire, anodal first signal input end that connects the 3 phase AC solid relay; The negative pole of voltage-stabiliser tube and anodal first signal input end and second signal input end that is connected the 3 phase AC solid relay respectively.

3. no-spark contactor control circuit according to claim 2; It is characterized in that: timing control unit comprises CPU, first and second optical coupling isolation circuits, first and second relays; Two clock signal control ends of CPU are connected with coil one end of first and second relays through first and second optical coupling isolation circuits respectively; The coil other end of first and second relays connects power supply; The normally opened contact of first relay is connected between first control signal output ends and ground wire of timing control unit, and the normally opened contact of second relay is connected between second control signal output ends and ground wire of timing control unit.

4. no-spark contactor control circuit according to claim 3 is characterized in that: the coil two ends of the coil of described first relay and second relay all are parallel with fly-wheel diode.