CN102768919A - Soft-start circuit - Google Patents
Soft-start circuit Download PDFInfo
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- CN102768919A CN102768919A CN201210199473XA CN201210199473A CN102768919A CN 102768919 A CN102768919 A CN 102768919A CN 201210199473X A CN201210199473X A CN 201210199473XA CN 201210199473 A CN201210199473 A CN 201210199473A CN 102768919 A CN102768919 A CN 102768919A
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- soft starting
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Abstract
A soft-start circuit comprises an alternating-current transformer, an alternating-current contactor, a rectification module, direct-current buses and filter capacitors. 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 by the aid of the normally open auxiliary contacts, the rectification module is connected with the direct-current buses, the filter capacitors are connected among the direct-current buses, and each pair of normally closed auxiliary contacts is respectively switched on by the aid of a power conductor and is loaded with a low-power power supply. By the aid of the structure of the soft-start circuit, the alternating-current contactor is switched on by low-power electric power of the normally closed auxiliary contacts before being powered on to work, low current passing through the normally closed auxiliary contacts of the alternating-current contactor is used for appropriately charging the capacitors in the buses after being rectified, and a main circuit is closed when the alternating-current contactor is pulled in to be powered on for working, so that non-impact powering on is achieved, and electric devices are protected from being damaged.
Description
Technical field
The present invention 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 invention provides a kind of soft starting circuit structure of utilizing A.C. contactor, during this circuit start, have the process of a buffering, can play a protective role to electric device.
The invention 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 is 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 soft starting circuit structure of the present invention, 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 present invention uses 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 a structure chart of the present invention.
Fig. 2-3 is a fundamental diagram of the present invention.
Fig. 4 uses the A.C. contactor structural representation for the present invention.
Embodiment
As shown in Figure 1, the structure of soft starting circuit of the present invention 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 fundamental diagram of the present invention, soft starting circuit promptly of the present invention, 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.
By soft starting circuit structure of the present invention, 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.
Claims (10)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199473.XA CN102768919B (en) | 2012-06-15 | 2012-06-15 | Soft-start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199473.XA CN102768919B (en) | 2012-06-15 | 2012-06-15 | Soft-start circuit |
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| CN102768919A true CN102768919A (en) | 2012-11-07 |
| CN102768919B CN102768919B (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210199473.XA Active CN102768919B (en) | 2012-06-15 | 2012-06-15 | Soft-start circuit |
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| CN (1) | CN102768919B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104066257A (en) * | 2014-07-15 | 2014-09-24 | 芜湖市政通市政工程有限责任公司 | Direct-current centralized power supply dimming system and method for public lighting |
| CN105186648A (en) * | 2015-09-28 | 2015-12-23 | 张家港市泓溢电源科技有限公司 | Auxiliary power supply and power supply method for lead-acid storage battery public busbar charge-discharge power supply |
| CN111668841A (en) * | 2020-06-28 | 2020-09-15 | 上海兆铄科技有限公司 | Pre-charging resistor and damping resistor integrated device in active power filter |
Citations (6)
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| CN85203227U (en) * | 1985-07-31 | 1986-05-07 | 徐建华 | Electric saving apparatus of single switch fix-and-let-go alternating-current contactor |
| CN86103570A (en) * | 1986-05-23 | 1987-01-24 | 赵志强 | Power-saving type electromagnetic mechanism |
| CN2084655U (en) * | 1990-12-05 | 1991-09-11 | 南昌市节能技术研究所 | Electricity saving ac contactor |
| JPH06284571A (en) * | 1993-03-26 | 1994-10-07 | Hitachi Koki Co Ltd | Rush current prevention circuit |
| CN201717793U (en) * | 2010-08-12 | 2011-01-19 | 深圳市华意隆实业发展有限公司 | Power switch circuit for welding machine |
| CN202633174U (en) * | 2012-06-15 | 2012-12-26 | 张家港市泓溢电源科技有限公司 | Soft starting circuit |
-
2012
- 2012-06-15 CN CN201210199473.XA patent/CN102768919B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203227U (en) * | 1985-07-31 | 1986-05-07 | 徐建华 | Electric saving apparatus of single switch fix-and-let-go alternating-current contactor |
| CN86103570A (en) * | 1986-05-23 | 1987-01-24 | 赵志强 | Power-saving type electromagnetic mechanism |
| CN2084655U (en) * | 1990-12-05 | 1991-09-11 | 南昌市节能技术研究所 | Electricity saving ac contactor |
| JPH06284571A (en) * | 1993-03-26 | 1994-10-07 | Hitachi Koki Co Ltd | Rush current prevention circuit |
| CN201717793U (en) * | 2010-08-12 | 2011-01-19 | 深圳市华意隆实业发展有限公司 | Power switch circuit for welding machine |
| CN202633174U (en) * | 2012-06-15 | 2012-12-26 | 张家港市泓溢电源科技有限公司 | Soft starting circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104066257A (en) * | 2014-07-15 | 2014-09-24 | 芜湖市政通市政工程有限责任公司 | Direct-current centralized power supply dimming system and method for public lighting |
| CN105186648A (en) * | 2015-09-28 | 2015-12-23 | 张家港市泓溢电源科技有限公司 | Auxiliary power supply and power supply method for lead-acid storage battery public busbar charge-discharge power supply |
| CN111668841A (en) * | 2020-06-28 | 2020-09-15 | 上海兆铄科技有限公司 | Pre-charging resistor and damping resistor integrated device in active power filter |
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| Publication number | Publication date |
|---|---|
| CN102768919B (en) | 2015-06-24 |
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