CN2208297Y - Contacltess electronic D.C. contactor - Google Patents

Abstract

The utility model relates to a contacltess electronic DC contactor, which is composed of a controlling circuit which is composed of a large-power Vmos pipe and integrated packages NE555 and LM7805, wherein, a pulse transformer is used as a system element of the Vmos pipe, the secondary pulse of the transformer can be used as a conduction signal which is supplied to the control pole of the Vmos pipe after filleting by diodes D[1] and D[2], and the primary pole of the transformer is connected with the output end of the controlling circuit. Compared with other contactless switches, the utility model has the characteristic that the contacltess electronic DC contactor can keep a high speed switching status under the working condition of large current. The utility model has the unique advantages in the aspects of DC speed regulation, voltage regulation, program controlled reversing of electrochemical process, constant current and electric heating power regulation, and the utility model has the advantages of explosion proofing, no operation noise, half permanence and no maintenance and wide applying foreground in the self controlling field.

Description

Contacltess electronic D.C. contactor

The utility model belongs to industrial power switch control assembly.

In industrial processes, be used for power equipment is carried out the electric equipment products of break-make control, all using from the relay to the AC/DC contactor for many years, as CJ-10 etc.The switch of this electromagnetic structure has characteristics easy to use simple in structure, is no less than at interval in the operating process in 5 seconds and can well works in break-make.When production process control adopted smart instrumentation and computer digit mode to control, this switch can not Fraquent start.What especially some need be to electric current and voltage is constant, motor governing speed and steady speed controlled, and when the temperature control of electric heating equipment imposed the control of accurate amount, this electromagnetic treadle was just not competent.Particularly be operated in the high speed on off operating mode, this contactor of the occasion of high-power utilization more can not use.Consider from energy savings and non-ferrous metal aspect in addition, the existence of holding electromagnet, not only the copper of consumes considerable, magnetic material but also electric contact need noble metals such as silver.Also can cause the wearing and tearing of mechanical part moving part and malfunctioning after long-term the use.

Aim to provide a kind of contact-less electronic D.C. contactor based on above-mentioned situation the purpose of this utility model.

Circuit theory of the present utility model as shown in the figure.It is made of the control circuit that high-power V mos pipe and integrated package NE555 and LM7805 form, it is characterized in that B time grade of hot junction of pulse transformer and is connected in parallel on the diode D at its two ends ₂Link to each other, constitute the power output stage of contactor, the elementary cold junction of pulse transformer B is connected to light-emitting diode D ₃With R ₆The absorption circuit of forming, C is passed through in the elementary hot junction of pulse transformer B ₃Link to each other with 3 pin of IC2, the negative pole of control end in is connected to 2 pin of IC1, R ₃, C ₁, C ₂Be connected to 1 pin of IC2, the positive level of in end is through R ₂Be connected to 1 pin of IC1,3 pin of IC1 respectively with R ₃, C ₁, R ₄And 4,8 pin of IC2 are continuous, and 2,6,7 pin of IC2 are connecting by R ₄, R ₅And C ₂The RC circuit of forming.The major loop switch power is by the decision of Vmos pipe maximum rated current.Diode D ₁, D ₂As the Continuity signal of supplying with Vmos pipe controlled stage G, when pulse shaping circuit was worked, the G end kept conduction level after the pulse voltage rectification, and the Vmos pipe is " opening " state.When pulse shaping circuit quits work, there is not commutating voltage output, G holds by R ₁Bypass is to the D level level of Vmos pipe, and the Vmos pipe is by being " pass " state.The output of the elementary connection control oscillation circuit of B, by the control electromotive force of control end input through current-limiting resistance R ₂By after the integrated regulator piece IC1 voltage stabilizing, offer pulse oscillation circuit ic chip 2, resistance R again ₅With capacitor C ₂Determining its pulse shaping cycle, oscillating impulse is looked for the output of 3 pin by IC2, again through C ₃, pulse transformer reaches control loop.Part voltage pulse output is through R when circuit working ₆Current limliting makes luminous tube diode D ₃Light D ₃Both be indicating operating status, the double again elementary reverse impulse of B of doing absorbs.The low capacitor C of decreasing ₁As high frequency bypass in order to further minimizing external interference.Control oscillation circuit part (in the circuit theory diagrams frame of broken lines) can be made modular structure, by the flame-retarded resin material package.

Circuit data accompanying drawing of the present utility model is dated.The electrical quantity of control end:

Input voltage: 0-2.5VDC(logical zero 4.7V-14V DC(logical one))

Input current: 10-25MA DC

To the shell insulation voltage:＞1000V DC

Major loop is insulated:＞1500V DC

Major loop parameter:

Rated voltage: 20-420V DC

Rated current: 20-200A DC

The utility model has utilized the transistorized switching characteristic of high-power V mos, when it is fully opened less conducting internal resistance with knot pressure drop compare less than 0.01% with line voltage, and do not increase, so can reliably working under effective radiating condition with electric current.The drive circuit of this device adopts the high-frequency isolation transformer technology, therefore power circuit and control loop do not have the direct relation of electricity, even the voltage of 1500V is added between control end and the power circuit, can not produce electrical breakdown (guaranteeing) by used isolating transformer insulating material and manufacture craft yet.During the utilization of contact-less electronic D.C. contactor instead of linear power device, can add linear pulse-width modulation circuit and get final product.The utility model is compared with other noncontacting switch to have under the operating state of big electric current, still can keep the advantage of high-speed on off state.Especially be applied to the array control of outdoor large LED ad display screen, can with the microcomputer direct interface, save the numerous and diverse interface equipment of self-control.Particularly having aspect the automation control continuous Power Regulation, explosion-proof, do not have the operation noise, volume is little, reliable or the like advantage in light weight almost is semipermanent and non-maintaining, has a wide range of applications at automation field.

Claims (3)

1, contact-less electronic D.C. contactor, the control circuit of being made up of high-power V mos pipe and integrated package NE555 and LM7805 constitutes, and it is characterized in that B time grade of hot junction of pulse transformer and is connected in parallel on the diode D at its two ends ₂Link to each other, constitute the power output stage of contactor, the elementary cold junction of pulse transformer B is connected to light-emitting diode D ₃With R ₆The absorption circuit of forming, C is passed through in the elementary hot junction of pulse transformer B ₃Link to each other with 3 pin of IC2, the negative level of control end in is connected to 2 pin of IC1, R ₃, C ₁, C ₂Be connected to 1 pin of IC2, the positive pole of in end is through R ₂Be connected to 1 pin of IC1,3 pin of IC1 respectively with R ₃, C ₁, R ₄And the connection of 4,8 pin of IC2,2,6,7 pin of IC2 are connecting by R ₄, R ₅And C ₂The RC circuit of forming.

2, according to the described contact-less electronic D.C. contactor of claim 1, it is characterized in that described light-emitting diode D ₃Both be indicating operating status (luminous), the double again elementary reverse impulse of B of doing absorbs.

3,, it is characterized in that described control oscillation circuit (in the circuit theory diagrams frame of broken lines) can be made into modular structure, by the flame-retarded resin material package according to claim 1 or 2 described contact-less electronic D.C. contactors.

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