CN202633174U

CN202633174U - Soft starting circuit

Info

Publication number: CN202633174U
Application number: CN2012202845136U
Authority: CN
Inventors: 朱磊
Original assignee: ZHANGJIAGANG CITY HONGYI POWER TECHNOLOGY Co Ltd
Current assignee: ZHANGJIAGANG CITY HONGYI POWER TECHNOLOGY Co Ltd
Priority date: 2012-06-15
Filing date: 2012-06-15
Publication date: 2012-12-26
Anticipated expiration: 2022-06-15

Abstract

The utility model discloses a soft starting circuit, which comprises an alternating current transformer, an alternating current contactor, a rectification module, direct current buses and a filter capacitor, wherein the alternating current contactor is provided with at least two pairs of normally open auxiliary contacts and at least two pairs of normally closed auxiliary contacts; the alternating current contactor is connected between the alternating current transformer and the rectification module through the normally open auxiliary contacts; the rectification module is connected with the direct current buses; the filter capacitor is connected between the direct current buses; and each pair of normally closed auxiliary contacts is switched on through a voltage conductor and is loaded with low-power voltage. By the structure of the soft starting circuit, before being switched on and working, the alternating current contactor is switched on by the low-power voltage through the normally closed auxiliary contacts; low current passing through the normally closed auxiliary contacts of the alternating current contactor is rectified and then charges the capacitor in the buses; and when the alternating current contactor is closed and is switched on to work, a main circuit is switched on without any impact, so that electric appliances cannot be damaged.

Description

A kind of soft starting circuit

Technical field

The utility model relates to a kind of soft starting circuit structure, especially a kind of soft starting circuit structure based on the A.C. contactor auxiliary contact.

Background technology

Contactor is a kind of control apparatus of automation.Contactor is mainly used in frequent connection or disjunction AC and DC circuit, and it is big to have a control capacity, but remote operation; Cooperate relay can realize fixed cycle operator, interlocked control, various quantitative controls and decompression and under-voltage protection; Be widely used in automatic control circuit; Its major control also can be used for controlling other electrical load, like electric heater, illumination, electric welding machine, capacitor group etc. to liking motor.Contactor can be divided into A.C. contactor and D.C. contactor by the kind of controlled electric current.Here the main A.C. contactor of using always of introducing.A.C. contactor can be divided into two kinds of electromagnetic type and vacuum type again.A.C. contactor is to be widely used as cut-offfing and control circuit of electric power.It utilizes main contact to open and close circuit, carries out control command with auxiliary contact.Main contact generally has only normal opened contact, and auxiliary contact often has two pairs of contacts with Chang Kai and normally closed function, and small-sized contactor also often cooperates main circuit to use as auxiliary relay.

The contact of A.C. contactor is processed by silver tungsten, has good electrical conductivity and high temperature resistant ablative.A.C. contactor mainly contains four parts and forms: (1) electromagnetic system comprises sucking coil, moving iron core and static iron core; (2) contact system comprises that three secondary main contacts and two often open, two normally closed auxiliary contacts, it and the interlock mutually that connects together of moving iron core; (3) arc-control device, the general bigger A.C. contactor of capacity all is provided with arc-control device, so that rapid breaking arc avoids burning out main contact; (4) insulation crust and annex, various springs, transmission mechanism, short-circuited conducting sleeve, binding post etc.Its operation principle is that when coil electricity, static iron core generation electromagnetic attraction will move the iron core adhesive, because contact system links with moving iron core, therefore move three movable contact springs of iron core drive and will move the closing of contact, thereby energized simultaneously.When coil blackout, suction disappears, and moving iron core interlock part relies on the reaction force of spring and separates, and main contact is broken off, and cuts off the electricity supply.

Because circuit can connected and cut off to A.C. contactor, contactor control capacity is big, is applicable to frequent operation and far distance controlled, is one of critical elements in the automatic control system.Therefore; More often be applied at present the control of main power circuit in the power-supply device, this application generally is a direct incoming transport contactor in main power circuit, has no buffering course during startup; Impact to major loop when causing connecting is bigger, causes the infringement of electric device easily.

Summary of the invention

In order to address the above problem, the utility model provides a kind of soft starting circuit structure of utilizing A.C. contactor, during this circuit start, has the process of a buffering, can play a protective role to electric device.

The utility model discloses a kind of soft starting circuit, the structure of this start-up circuit comprises: AC transformer, A.C. contactor, rectification module, dc bus, filter capacitor; This A.C. contactor has at least two pairs and often opens auxiliary contact and at least two pairs of normally closed auxiliary contacts; This A.C. contactor is often driven auxiliary contact with it and is accessed between AC transformer and the rectification module; And this rectification module is connected with this dc bus; This filter capacitor is connected between the dc bus, and wherein respectively this connects and be loaded with lower wattage power supply with power conductor respectively to normally closed auxiliary contact.

Aforesaid soft starting circuit, this lower wattage power supply are the external power source or the internal electric source of A.C. contactor.

Aforesaid soft starting circuit, the power of this lower wattage power supply are 5-30W.

Aforesaid soft starting circuit, this rectification module are triode.

Aforesaid soft starting circuit, this filter capacitor are a plurality of, and these a plurality of filter capacitors are connected in parallel in the dc bus.

Aforesaid soft starting circuit, this quantity of often driving auxiliary contact is more than three pairs or three pairs.

Aforesaid soft starting circuit, respectively this is to the load that is provided with between the normally closed auxiliary contact.

Aforesaid soft starting circuit; Said A.C. contactor is by main contactor and only lock device and constitute; Only lock device and be positioned at a side of main contactor; Only lock the ending on the movement locus of moving iron core link that lock support iron is positioned at main contactor of device, the main coil of main contactor is connected on the power supply through starting switch, and the locking wire circle that ends of only locking device is connected across power supply two ends that the main contactor normally opened contact stimulates through shutdown switch.

Aforesaid soft starting circuit; Described main contactor comprises contact, auxiliary contact, moving iron core, starting switch, main coil and moving iron core link; The upper end of moving iron core is connected with moving iron core link, and contact and auxiliary contact are connected the upper end of moving iron core link, in the lower end of moving iron core main coil is arranged; Main coil is connected across on the power supply through starting switch, on moving iron core link, has and only locks gap.

Aforesaid soft starting circuit; The described device of only locking comprises; End lock support iron, only lock armature, shutdown switch and end the locking wire circle, the lock of ending support iron is arranged on the movement locus of only locking gap of the moving iron core link of main contactor, end the side that the locking wire circle is positioned at main coil; Only lock armature and end lock support iron and is connected, end the locking wire circle through shutdown switch be connected across the secondary power supply of main contactor normally opened contact two ends.

By the soft starting circuit structure of the utility model, be to utilize normally closed auxiliary contact, made before A.C. contactor is not being switched on work; Through the low power electric power conducting of normally closed auxiliary contact, the little electric current that the A.C. contactor normally closed auxiliary contact passes through suitably charges for after the rectification electric capacity in the bus in advance; When the A.C. contactor adhesive and when switching on work; Main circuit is connected, and realizes not having impacting and connects, and the protection electric device is without prejudice.

The utility model is used A.C. contactor, and is simple in structure, during line work, can save the power supply of A.C. contactor main coil maintenance magnetic not to the power supply of A.C. contactor main coil fully, keeps the operating state power saving and can reach 90%, saved the energy.

Description of drawings

Fig. 1 is the structure chart of the utility model.

Fig. 2-3 is the fundamental diagram of the utility model.

Fig. 4 uses the A.C. contactor structural representation for the utility model.

Embodiment

As shown in Figure 1, the structure of the soft starting circuit that this is novel comprises: AC transformer 1, A.C. contactor 2, rectification module 3, dc bus 4, filter capacitor 5; This A.C. contactor 2 has at least two pairs and often opens auxiliary contact and at least two pairs of normally closed auxiliary contacts, and as shown be three pairs and often open auxiliary contact and two pairs of normally closed auxiliary contacts, and conducting between two normally closed auxiliary contacts, and be connected with a resistance 6.This A.C. contactor 2 is often driven auxiliary contact with it and is accessed between AC transformer 1 and the rectification module 3; And this rectification module 3 is connected with this dc bus 4; This filter capacitor 5 is connected between the dc bus 4, wherein respectively this to having fed electric current in the normally closed auxiliary contact.Respectively this is loaded with lower wattage power supply to normally closed auxiliary contact one side contact, and this lower wattage power supply for example is 5-30W, and this lower wattage power supply is the external power source or the internal electric source of A.C. contactor.

Shown in Fig. 2-3, be the fundamental diagram of the utility model, i.e. the utility model soft starting circuit, the work sketch map of not switching on and switching at A.C. contactor.Before A.C. contactor 2 is not being switched on work; Through the low power electric power conducting of normally closed auxiliary contact, the little electric current I that the A.C. contactor normally closed auxiliary contact is passed through suitably charges for after this little electric current I rectification capacitor C 1 or C2 in the bus in advance; When the A.C. contactor adhesive and when switching on work; Main circuit is connected, and realizes not having impacting and connects, and the perhaps other kinds electric device of protection filtered electrical is without prejudice.Wherein, this quantity of often driving auxiliary contact is more than three pairs or three pairs, and this rectification module is a triode, and the quantity of filter capacitor can be two or more, is parallel in the dc bus separately.

As shown in Figure 4; Said A.C. contactor is by main contactor and only lock device and constitute; Only lock device and be positioned at a side of main contactor; Only lock the ending on the movement locus of moving iron core link 16 that lock support iron 12 is positioned at main contactor of device, the main coil 11 of main contactor is connected on the power supply through starting switch 10, and the locking wire circle that ends of only locking device is connected across power supply two ends that the main contactor normally opened contact stimulates through shutdown switch.

Described main contactor comprises contact 7, auxiliary contact 8, moving iron core 9, starting switch 10, main coil 11 and moving iron core link 16; The upper end of moving iron core 9 is connected with moving iron core link 16; Contact 7 is connected the upper end of moving iron core link 16 with auxiliary contact 8; There is main coil 11 lower end at moving iron core 9, and main coil 11 is connected across on the power supply through starting switch 10, on moving iron core link 16, has and only locks gap.

Aforesaid soft starting circuit; The described device of only locking comprises; End lock support iron 12, only lock armature 13, shutdown switch 14 and end locking wire circle 15, the lock of ending support iron 12 is arranged on the movement locus of only locking gap of the moving iron core link 16 of main contactor, end the side that locking wire circle 15 is positioned at main coil; Only lock armature 13 and end lock support iron 12 and is connected, end locking wire circle 15 through shutdown switch be connected across the secondary power supply of main contactor normally opened contact two ends.

Claims

1. a soft starting circuit comprises: AC transformer, A.C. contactor, rectification module, dc bus, filter capacitor; It is characterized in that; This A.C. contactor has at least two pairs and often opens auxiliary contact and at least two pairs of normally closed auxiliary contacts; This A.C. contactor is often driven auxiliary contact with it and is accessed between AC transformer and the rectification module; And this rectification module is connected with this dc bus, and this filter capacitor is connected between the dc bus, and wherein respectively this connects and be loaded with lower wattage power supply with power conductor respectively to normally closed auxiliary contact.

2. soft starting circuit as claimed in claim 1 is characterized in that: this lower wattage power supply is the external power source or the internal electric source of A.C. contactor.

3. soft starting circuit as claimed in claim 1 is characterized in that: the power of this lower wattage power supply is 5-30W.

4. soft starting circuit as claimed in claim 1 is characterized in that: this rectification module is a triode.

5. soft starting circuit as claimed in claim 1 is characterized in that: this filter capacitor is a plurality of, and these a plurality of filter capacitors are connected in parallel in the dc bus.

6. soft starting circuit as claimed in claim 1 is characterized in that: this quantity of often driving auxiliary contact is more than three pairs or three pairs.

7. soft starting circuit as claimed in claim 1 is characterized in that: respectively this is to the load that is provided with between the normally closed auxiliary contact.

8. soft starting circuit as claimed in claim 1; It is characterized in that: said A.C. contactor is by main contactor and only lock device and constitute; Only lock device and be positioned at a side of main contactor; Only lock the ending on the movement locus of moving iron core link that lock support iron is positioned at main contactor of device, the main coil of main contactor is connected on the power supply through starting switch, and the locking wire circle that ends of only locking device is connected across power supply two ends that the main contactor normally opened contact stimulates through shutdown switch.

9. soft starting circuit as claimed in claim 8; It is characterized in that: described main contactor comprises contact, auxiliary contact, moving iron core, starting switch, main coil and moving iron core link; The upper end of moving iron core is connected with moving iron core link, and contact and auxiliary contact are connected the upper end of moving iron core link, in the lower end of moving iron core main coil is arranged; Main coil is connected across on the power supply through starting switch, on moving iron core link, has and only locks gap.

10. soft starting circuit as claimed in claim 8; It is characterized in that: the described device of only locking comprises; End lock support iron, only lock armature, shutdown switch and end the locking wire circle, the lock of ending support iron is arranged on the movement locus of only locking gap of the moving iron core link of main contactor, end the side that the locking wire circle is positioned at main coil; Only lock armature and end lock support iron and is connected, end the locking wire circle through shutdown switch be connected across the secondary power supply of main contactor normally opened contact two ends.