CN2698760Y

CN2698760Y - Contactless control cabinet

Info

Publication number: CN2698760Y
Application number: CN 200420031708
Authority: CN
Inventors: 张承臣; 吕凤钧; 樊明元; 赵刚; 胡占林
Original assignee: Fushun Longi Magnet Co Ltd
Current assignee: Longi Magnet Co Ltd
Priority date: 2004-05-21
Filing date: 2004-05-21
Publication date: 2005-05-11
Anticipated expiration: 2014-05-21

Abstract

The utility model discloses a contactless control cabinet which provides direct current power supply to large lifting electromagnet of direct current and accomplishes control. The goal of the utility model is to provide safe and reliable control power source to the operation of the lifting electromagnet. The alternating current power supply passes through a chopper, a transformer, a bridge rectifier module and an on-off element to form the main circuit of the control cabinet. The utility model adopts a new insulated gate bipolar transistor IGBT as the on-off element. The output minus pole of the bridge rectifier V1-V6 is connected with the S pole of the emitter of the IGBT. The collector Dof the IGBT is connected with an excitation coil. The output anode of the V1-V6 is connected with the other end of the coil to form a major loop to control the make and break of the loop of the electromagnet. The utility model can substitute the conventional control cabinet of direct current electromagnet with advantages of no spark, high dependability, convenient maintenance and reliable use of electromagnet. The contactless control cabinet can be widely used in working field to control various lifting electromagnets.

Description

The contact pointless control housing

One, technical field

The utility model relates to a kind of control housing of direct supply being provided for the large-scale lifting electromagnet of direct current and realizing control, and purpose provides safe and reliable control power supply for the work of lifting electromagnet.

Two, background technology

Traditional lifting electromagnet control housing is the power supply of controlling the lifting electromagnet coil of the switching by DC contactor.Because the lifting electromagnet coil belongs to big inductance element, when leading to big electric current, magnet coil can store very big magnetic field energy in coil, the huge energy that is stored in when electromagnet turn-offs fast in the excitation coil will discharge at short notice, the releasing pattern of this energy is exactly arcing between the contact of DC contactor, just when disconnecting, DC contactor produces the phenomenon of huge spark, so working, the contact of DC contactor just burns out after short a period of time, just need to safeguard and change the contact, safeguard for production and brought very big trouble, between the DC contactor contact, can produce at lifting electromagnet coil two ends during arcing simultaneously and be higher than the transient high voltage of rated operational voltage more than 10 times, this high potential is very unfavorable to the insulation of magnet coil, is easy to the insulation of breakdown potential magnet coil.

Another lifting electromagnet control housing adopts silicon control as on-off element, and silicon control is the device that the control utmost point can not turn-off, and turn-offs magnet coil with silicon control, must can realize after removing corresponding power supply.And silicon controlled triggers the circuit card that also needs a cover complexity, the all corresponding raising of fault rate and maintenance difficulty, and is no anti-short circuit capability with silicon control as on-off element, as long as the control housing power circuit is easy to burn out between output line or during the electromagnet turn-to-turn short circuit.Change the contact for DC contactor and get final product work, when not checking out short dot, directly change new silicon control and still burn out, do not have the short-circuit protection ability, bring sizable trouble can for user or production.Based on present this situation, be badly in need of a kind of energy of exploitation stable operation, no spark, noiselessness, the equipment of being convenient to safeguard.

Three, summary of the invention

The purpose of this utility model provides stable, a failure-free contact pointless control housing to lifting electromagnet exactly.The technical solution adopted in the utility model is: the contact pointless control housing is made up of source of AC, breaker protector, voltage transformer, rectifier bridge, on-off element, excitation coil, control transformer, control power supply; the utility model adopts the on-off element of novel insulated gate bipolar transistor IGBT as direct current circuit, is furnished with control protection electric circuit simultaneously.Source of AC connects the elementary of main transformer and control transformer through breaker protector, the secondary rectifier bridge that connects of main transformer, the rectifier bridge output cathode connects excitation coil of electromagnet, another termination of excitation coil IGBT module D utmost point, the S utmost point of IGBT connects the negative pole of rectifier bridge, forms governor circuit; Control transformer time utmost point connection control power supply, the control power output end connects the G utmost point of IGBT on-off element, output control signal, the controllable function of realization break-make.IGBT is a driving circuit; defencive function and major loop are integrated in one; the integrated level height; pig-tail wire is few; simple in structure; easy for installation; also has very strong defencive function simultaneously; as: (1) short-circuit protection function: when major loop was short-circuited, collecting electrode D electric current sharply rose, and its influence can make the voltage between grid G and emitter S; produce a pointed pulse; this pointed pulse meeting further increases collecting electrode D electric current, forms the positive feed back effect, in order to protect the IGBT power circuit; at internal gate G; added a zener diode between emitter S and clamped down on the rising of pointed pulse voltage, played a protective role.(2) overheat protective function: internal base plate is provided with detector unit, when the excessive temperature build-up of electric current, and the signal of in-to-in temperature element meeting suppressor grid G, the electric current of reduction collecting electrode D.(3) control line under-voltage defencive function: when control voltage is lower than specified value, carry out under-voltage protection, and the sensitivity of protection is also high, just switching speed is fast, and loss is few.Can be in several microseconds when circuit and device fails cut off, can protect other element and self not be damaged.

But advantage of the present utility model is exactly the heavy DC in the at high speed shutoff lifting electromagnet loop; utilize energy stored in the transistor circuit release magnet coil; avoided the arcing phenomenon in the circuit; transistor circuit has the excellent protection function simultaneously; can anti-rush of current, can reliable and stable work.Can be widely used in the work-site of the various lifting electromagnets of control.

Four, description of drawings

Figure one is a logic control chart of the present utility model;

Figure two is schematic circuit diagram of the present utility model.

Five, the specific embodiment

The a whole set of circuit of the utility model is made up of source of AC 1, breaker protector 2, voltage transformer 3, rectifier bridge 4, IGBT module 5, excitation coil 6, control transformer 7, control power supply 8.

In order to realize working stability, failure-free production environment; the utility model mainly contains the characteristics of the following aspects at design aspect: first; source of AC 1, breaker protector 2, voltage transformer 3, rectifier bridge 4, IGBT module 5, excitation coil 6, composition governor circuit; form control circuit from circuit breaker 2 back power takings by control transformer 7, control power supply 8; control signal is given on the circuit of IGBT module 5, with the grid G of control IGBT.Second, the three phase mains of 380VAC gives excitation coil 6 logical direct current (DC) after voltage transformer 3, three phase full bridge rectification 4 V1～V6 rectification by circuit breaker 2 during work, add switch element IGBT module 5 in the direct current circuit, the control circuit break-make, give the control power supply 8 power supplies by control transformer 7 in the control loop, control signal is given on the circuit of IGBT module 5, the grid G of control IGBT, when reaching 15V, the voltage of the grid G of IGBT module 5 constitutes power circuit with regard to conducting, when the 15V electric signal removes, IGBT automatically shuts down, and cuts off electric current.

Claims

1, a kind of contact pointless control housing, it is made up of source of AC, breaker protector QF, voltage transformer BT1, rectifier bridge V1～V6, on-off element, excitation coil R, control transformer BT2, control power supply YZDY, it is characterized in that: adopt the IGBT module as on-off element, source of AC connects the elementary of voltage transformer BT1, BT2 through breaker protector QF, BT1 time level meets rectifier bridge V1～V6, the rectifier bridge output cathode connects excitation coil R, another termination of excitation coil R IGBT module D utmost point, the S utmost point of IGBT connects the negative pole of rectifier bridge; BT2 time the utmost point connects control power supply YZDY, the grid G of the output termination IGBT of YZDY.