CN102768919B - Soft-start circuit - Google Patents
Soft-start circuit Download PDFInfo
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- CN102768919B CN102768919B CN201210199473.XA CN201210199473A CN102768919B CN 102768919 B CN102768919 B CN 102768919B CN 201210199473 A CN201210199473 A CN 201210199473A CN 102768919 B CN102768919 B CN 102768919B
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- lock
- starting circuit
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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 start circuit structure, especially a kind of soft start circuit structure based on 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; there is control capability large; can remote operation; coordinate relay can realize fixed cycle operator, interlocked control, various fixing quantity and decompression and under-voltage protection; be widely used in automatic control circuit; its major control, to liking motor, also can be used for controlling other electrical load, as electric heater, illumination, electric welding machine, Capacitor banks etc.Contactor can be divided into A.C. contactor and D.C. contactor by the kind of controlled electric current.Here the A.C. contactor that main introduction is conventional.A.C. contactor can be divided into again electromagnetic type and vacuum type two kinds.A.C. contactor is widely used as cut-offfing and control circuit of electric power.It utilizes main contact to carry out opening and closing circuit, performs control command with auxiliary contact.Main contact generally only has normal opened contact, and auxiliary contact often has two to the contact with Chang Kai and normally closed function, and small-sized contactor is also frequent coordinates main circuit to use as auxiliary relay.
The contact of A.C. contactor, is made up of silver tungsten, has good conductivity and high temperature resistant ablative.A.C. contactor mainly contains four part compositions: (1) electromagnetic system, comprises sucking coil, dynamic iron core and static iron core; (2) contact system, comprise three secondary main contacts and two often open, two normally closed auxiliary contacts, it and dynamic iron core connect together interlock mutually; (3) arc-control device, the A.C. contactor that general capacity is larger is all provided with arc-control device, so that rapid breaking arc, avoids burning out main contact; (4) insulation crust and annex, various spring, transmission mechanism, short-circuited conducting sleeve, binding post etc.Its operation principle is, when the coil is energized, static iron core produces electromagnetic attraction, will move iron core adhesive, and because contact system and dynamic iron core link, therefore dynamic iron core drives three movable contact springs to run simultaneously, the closing of contact, thus switches on power.When the coil is de-energized, suction disappears, and dynamic iron core interlock part relies on the reaction force of spring and is separated, and main contact is disconnected, cuts off the electricity supply.
Can connect due to A.C. contactor and cut off circuit, contactor control capability is large, and being applicable to frequent operation and far distance controlled, is one of critical elements in automatic control system.Therefore, more often be applied to the control of main power lines in power-supply device at present, this application is generally direct incoming transport contactor in main power circuit, without any buffering course during startup, comparatively large to the impact of major loop when causing connecting, easily cause the infringement of electric device.
Summary of the invention
In order to solve the problem, the invention provides a kind of soft start circuit structure utilizing A.C. contactor, during this circuit start, there is 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 to often opening 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 rectification module, and this rectification module is connected with this DC bus, this filter capacitor is connected between DC bus, and wherein respectively this is connected with power conductor respectively normally closed auxiliary contact and is loaded with lower wattage power supply.
Soft starting circuit as above, this lower wattage power supply is external power source or the internal electric source of A.C. contactor.
Soft starting circuit as above, the power of this lower wattage power supply is 5-30W.Soft starting circuit as above, this rectification module is triode.
Soft starting circuit as above: this filter capacitor is multiple, and the plurality of filter capacitor is connected in parallel in DC bus.
Soft starting circuit as above, this quantity often driving auxiliary contact be three to or three to more than.
Soft starting circuit as above, respectively this is to being provided with load between normally closed auxiliary contact.
Soft starting circuit as above, described A.C. contactor by main contactor and only lock device form, only lock device is positioned at the side of main contactor, only the only lock iron brace of lock device is positioned on the movement locus of dynamic iron core link of main contactor, the main coil of main contactor is connected on power supply by starting switch, and only the only locking wire circle of lock device is connected across the both ends of power of main contactor normally opened contact stimulation by shutdown switch.
Soft starting circuit as above, described main contactor comprises contact, auxiliary contact, dynamic iron core, starting switch, main coil and dynamic iron core link, the upper end of dynamic iron core is connected with dynamic iron core link, contact and auxiliary contact are connected to the upper end of dynamic iron core link, main coil is had in the lower end of dynamic iron core, main coil is connected across on power supply by starting switch, dynamic iron core link has and only locks gap.
Soft starting circuit as above, described only lock device comprises, only lock iron brace, only lock armature, shutdown switch and only locking wire circle, the movement locus moving the only lock gap of iron core link at main contactor has and only locks iron brace, only locking wire circle is positioned at the side of main coil, only lock armature with only lock iron brace and be connected, stop locking wire circle is connected across the stimulation of main contactor normally opened contact both ends of power by shutdown switch.
By soft start circuit structure of the present invention; utilize normally closed auxiliary contact; made at A.C. contactor before non-energising work; in advance by the low power electric power conducting of normally closed auxiliary contact, the small area analysis that A.C. contactor normally closed auxiliary contact passes through, suitably charges to after rectification the electric capacity in bus; be energized when A.C. contactor adhesive work time; main circuit is connected, and realizes connecting without impacting, and protective device part is without prejudice.
The present invention's A.C. contactor, structure is simple, during line work, can not power to A.C. contactor main coil completely, and eliminate the power supply that A.C. contactor main coil keeps magnetic, the power saving of maintenance work state can reach 90%, saves the energy.
Accompanying drawing explanation
Fig. 1 is structure chart of the present invention.
Fig. 2-3 is fundamental diagram of the present invention.
Fig. 4 is the present invention's A.C. contactor structural representation.
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 to often opening auxiliary contact and at least two pairs of normally closed auxiliary contacts, as shown is three to often opening 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 rectification module 3, and this rectification module 3 is connected with this DC bus 4, this filter capacitor 5 is connected between DC bus 4, wherein respectively this to having passed into electric current in normally closed auxiliary contact.Respectively this is loaded with lower wattage power supply to contact, normally closed auxiliary contact side, and this lower wattage power supply is such as 5-30W, and this lower wattage power supply is external power source or the internal electric source of A.C. contactor.
As Figure 2-3, be fundamental diagram of the present invention, i.e. soft starting circuit of the present invention, at the operating diagram that A.C. contactor is not energized and is energized.At A.C. contactor 2 before non-energising work; in advance by the low power electric power conducting of normally closed auxiliary contact; make the small area analysis I that A.C. contactor normally closed auxiliary contact passes through; suitably charge to after this small area analysis I rectification electric capacity C1 or C2 in bus; be energized when A.C. contactor adhesive work time; main circuit is connected, and realizes connecting without impacting, and the perhaps other kinds electric device of protection filtered electrical is without prejudice.Wherein, this quantity often driving auxiliary contact be three to or three to more than, this rectification module is triode, and the quantity of filter capacitor can be two or more, is parallel in DC bus separately.
As shown in Figure 4, described A.C. contactor by main contactor and only lock device form, only lock device is positioned at the side of main contactor, only the only lock iron brace 12 of lock device is positioned on the movement locus of dynamic iron core link 16 of main contactor, the main coil 11 of main contactor is connected on power supply by starting switch 10, and only the only locking wire circle of lock device is connected across the both ends of power of main contactor normally opened contact stimulation by shutdown switch.
Described main contactor comprises contact 7, auxiliary contact 8, dynamic iron core 9, starting switch 10, main coil 11 and dynamic iron core link 16, the upper end of dynamic iron core 9 is connected with dynamic iron core link 16, contact 7 and auxiliary contact 8 are connected to the upper end of dynamic iron core link 16, main coil 11 is had in the lower end of dynamic iron core 9, main coil 11 is connected across on power supply by starting switch 10, dynamic iron core link 16 has and only locks gap.
Soft starting circuit as above, described only lock device comprises, only lock iron brace 12, only lock armature 13, shutdown switch 14 and stop locking wire circle 15, the movement locus moving the only lock gap of iron core link 16 at main contactor there is only lock iron brace 12, only locking wire circle 15 is positioned at the side of main coil, only lock armature 13 with only lock iron brace 12 and be connected, stop locking wire circle 15 is connected across the stimulation of main contactor normally opened contact both ends of power by shutdown switch.
By soft start circuit structure of the present invention; utilize normally closed auxiliary contact; made at A.C. contactor before non-energising work; in advance by the low power electric power conducting of normally closed auxiliary contact, the small area analysis that A.C. contactor normally closed auxiliary contact passes through, suitably charges to after rectification the electric capacity in bus; be energized when A.C. contactor adhesive work time; main circuit is connected, and realizes connecting without impacting, and protective device part is without prejudice.
Claims (9)
1. a soft starting circuit, comprise AC transformer, A.C. contactor, rectification module, DC bus, filter capacitor, this rectification module is connected with this DC bus, this filter capacitor is connected between DC bus, this A.C. contactor has at least two to often opening 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 rectification module, and wherein respectively this is connected with power conductor respectively normally closed auxiliary contact and is loaded with lower wattage power supply, it is characterized in that, described A.C. contactor by main contactor and only lock device form, only the only locking wire circle of lock device is connected across the both ends of power of main contactor normally opened contact stimulation by shutdown switch, described main contactor comprises contact, auxiliary contact, dynamic iron core, starting switch, main coil and dynamic iron core link, the upper end of dynamic iron core is connected with dynamic iron core link, contact and auxiliary contact are connected to the upper end of dynamic iron core link, main coil is had in the lower end of dynamic iron core, main coil is connected across on power supply by starting switch, dynamic iron core link has and only locks gap.
2. soft starting circuit as claimed in claim 1, is characterized in that: this lower wattage power supply is 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 triode.
5. soft starting circuit as claimed in claim 1, is characterized in that: this filter capacitor is multiple, and the plurality of filter capacitor is connected in parallel in DC bus.
6. soft starting circuit as claimed in claim 1, is characterized in that: this quantity often driving auxiliary contact be three to or three to more than.
7. soft starting circuit as claimed in claim 1, is characterized in that: respectively this is provided with load between normally closed auxiliary contact.
8. soft starting circuit as claimed in claim 1, it is characterized in that: described only lock device is positioned at the side of main contactor, only the only lock iron brace of lock device is positioned on the movement locus of dynamic iron core link of main contactor, and the main coil of main contactor is connected on power supply by starting switch.
9. soft starting circuit as claimed in claim 1, it is characterized in that: described only lock device comprises, only lock iron brace, only lock armature, shutdown switch and only locking wire circle, the movement locus moving the only lock gap of iron core link at main contactor has and only locks iron brace, only locking wire circle is positioned at the side of main coil, only lock armature with only lock iron brace and be connected, stop locking wire circle is connected across the stimulation of main contactor normally opened contact both ends of power by shutdown switch.
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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| Publication Number | Publication Date |
|---|---|
| CN102768919A CN102768919A (en) | 2012-11-07 |
| CN102768919B true CN102768919B (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210199473.XA Active CN102768919B (en) | 2012-06-15 | 2012-06-15 | Soft-start circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104066257B (en) * | 2014-07-15 | 2016-09-28 | 芜湖市政通市政工程有限责任公司 | Public illumination direct current centrally connected power supply light adjusting system and method |
| 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 |
| CN111668841B (en) * | 2020-06-28 | 2023-01-13 | 上海兆铄科技有限公司 | Pre-charging resistor and damping resistor integrated device in active power filter |
Citations (5)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06284571A (en) * | 1993-03-26 | 1994-10-07 | Hitachi Koki Co Ltd | Rush current prevention circuit |
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2012
- 2012-06-15 CN CN201210199473.XA patent/CN102768919B/en active Active
Patent Citations (5)
| 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 |
| 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 |
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| CN102768919A (en) | 2012-11-07 |
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