CN205946373U - A regulator circuit for printed circuit board - Google Patents

Abstract

A a regulator circuit for printed circuit board, but see through form logic controller of installation, control whether open circuit of a relay for current value among the control circuit makes current efficiency controlled in fixed codomain, and it must level to be used for keeping electroplating degree layer, and the effect is electroplated to effective the enhancement, can also reach the purpose of energy -conservation simultaneously, also has the effectual help of ten minutes to the cost keyholed back plate.

Description

Adjustment circuit for printed circuit board (PCB)

Technical field

The utility model is related to a kind of circuit, more specifically, it is to be related to a kind of adjustment circuit for printed circuit board (PCB), by not stopping sample rate current efficiency, after being computed device computing, sending can program logic controller (programmable logic controller) to one, disconnect a relay in order to send interrupt signal, after disconnection, this relay can be restarted so that current signal can keep stable automatically, lifting throwing power (Throwing Power).

Background technology

Printed circuit board (PCB) (Printed Circuit Board) is a kind of technology reappearing electric conductor on a kind of substrate in insulation, install through various electronic component and be linked on substrate, to form an electronic circuit, make it to play the function of every electronic building brick, to reach the purpose of signal transacting.The manufacture process of circuit board is application printing, the technology such as takes a picture, etches and electroplate to manufacture the distribution of precision, the assembling base mutually continued as circuit between support electronic component and part, therefore, the distribution of densification and multiple stratification forms technology and becomes the main flow of printed circuit board (PCB) development of manufacturing.

In order to allow idioelectric substrate can connect each electronic building brick; chemistry analysis plating (Chemical Deposition) would generally be will transmit through allows substrate become conductor; chemistry analysis plating is otherwise known as electroless plating (Electroless Deposition) or self-catalysis analysis plating (Autoctalytic Deposition), as a kind of not impressed current and can make metal from plating solution persistently analysis be plated to a kind of redox reaction on surface through overactivation.

Carry out chemistry analysis plating after substrate just have conductive capability, now just through electric plating of whole board method, metallic copper can be covered in plate face again, finally just can go again etching with demoulding come come to complete connect up (conductor pattern).Its objective is chemical plating analysis the metallized thin copper layer of metapore on, electroplate layer of metal copper, thicken in the hole layers of copper after, afterwards again go etch when just will not allow chemical plating analysis result all that has been achieved is spoiled.But in process of production, we usually can be found that the uneven thickness of plate face coating, or can find that space of a whole page corner has that stone inscription is not net or overetched situation in etching work procedure afterwards.

With printed circuit board (PCB) towards multilayer, high density, in high precision, the direction of multifunction develop, the effect of electroplating work procedure is that to directly affect product good and bad, plays very crucial operation in printed circuit board (PCB) processing procedure.And because used in electroplating process, plating solution and additive etc. have toxicity and corrosivity, continuous work can corrode electroplating bath and plating rack for a long time, even if after the completion of every procedure in electroplating process, equipment will be filtered dry and cleaning treatment, but some liquid still can be attached with plating rack or wiring board, these all can lead to integral device damage that the electric current in electroplating process more can be made unstable, and affects the factor of electroplating technology further.

Circuit designed now nearly all just can will be implemented through multi-layer sheet, the adhesion of copper plate, uniform and delicate, tensile strength and elongation percentage etc. is required with increasingly tighter, also more and more higher, therefore just seem particular importance to the quality control of the electroplates in hole.Uniformity and uniformity in order to ensure the electroplates in hole layers of copper, in high aspect ratio printed circuit board electroplating technology, in addition to the additive through high-quality is to assist, how coating should be reduced unstable, or the great production accident that cannot plate occurs, then for matter of utmost importance to be solved in the utility model at all.

Electric plating of whole board is mainly the negative electrode of the bath solution that printed circuit board (PCB) is placed in sulfur acid copper, sulfuric acid and trace chlorine and additive (polishing material); anode is phosphor-copper block; supply dc source; make a kind of electrochemical reaction process of depositing metallic copper on the circuit copper of circuit board; it is also a kind of redox reaction; it is primarily used to protect that layer of very thin chemical copper on substrate for the depositing after chemical plating analysis, will not aoxidize and further by acidleach eating away.We are it is found that electroplating reaction to be completed just can certainly will be reacted through " electric " with this.For this, we follow electroplating principle solution degree to analyze, it is understood that the setting of current density must determine initial value according to actual plating area on printed circuit board (PCB), then its current density is then depending on the factors such as the main salt concentration of the low copper electrolyte of peracid, solution temperature, additive level, stirring extent.

But, in electroplating process, electric current can form three-level distribution, the CURRENT DISTRIBUTION of each pole suffers from different impacts to plating achievement, wherein affected maximum with one-level electric current again, because one-level electric current is based on negative electrode and high/low currents distribution produced by the relative distance distance of anode, that is, one-level electric current is also not affected by the impact of electrode polarization and other factors；Two-level current is then because having occurred that electrochemical reaction near electrode so that the resistance in electroplate liquid increases, and therefore arises that polarization reaction on printed circuit board (PCB), leads to local current can produce difference with one-level CURRENT DISTRIBUTION state；Tertiary current then refer to through hole or its nearby under the influence of receiving the factors such as coating bath geometry, plating solution electric conductivity, quality transfering rate, copper ion concentration, produced CURRENT DISTRIBUTION.

So it is understood that in different phase, electric current in electroplating work procedure can be because plating solution be varied from polarization reaction, but the stable of electric current creates the last quality electroplating effect again, for example, if can be more efficiently in order to allow two, tertiary current to be distributed, it is so that necessity is adjusted so that intensifying current in one-level CURRENT DISTRIBUTION, if but electric current at the beginning is too high and easily causes that the plate face uniformity is not good or dog bone phenomenon, therefore how to allow CURRENT DISTRIBUTION more uniform, then primarily realize target for the utility model.

Content of the invention

One of the purpose of this utility model be to provide one for printed circuit board (PCB) adjustment circuit, to form a control circuit through simple electronic building brick so that electric current can maintain fixing target codomain and can effectively be lifted so that electroplating into cheerful chatting quality in electroplating process.

Another object of the present utility model is to provide an adjustment circuit being used for printed circuit board (PCB), through control initial current density, cathodic polarization reaction is obtained strengthen, the potential activation reaction that lifting metal ion separates out, so that last galvanization coating intensity is effectively lifted.

Another object of the present utility model is to provide an adjustment circuit being used for printed circuit board (PCB), electric current is carried out the collection of data, analyze and process through installing linear quadratic control circuit, the unstable situation of coating in electroplating process is obtained improve, the production efficiency of present day devices can be effectively substantially improved.

Another object of the present utility model be to provide one for printed circuit board (PCB) adjustment circuit so that the electric current distribution in electroplating process can become more average, lifting coating crystalline rate is so as to electroplate into efficiency more careful smooth further.

Another object of the present utility model is to provide an adjustment circuit being used for printed circuit board (PCB), temporarily to interrupt electroplating work procedure through control circuit sending signal, the electron ion concentration making the electroplate liquid in cathodic region obtains, reduce electroplate liquid electricity group rate, improve its dispersibility simultaneously, make plating piece overlay coating color uniformity, simultaneously

Whether another object of the present utility model is to provide an adjustment circuit being used for printed circuit board (PCB), can automatic control circuit interrupt, and controls to provide the electric current in fixing codomain through circuit, to maintain plating effect.

For achieving the above object, the utility model system provides an adjustment circuit being used for printed circuit board (PCB), comprise a rectification circuit, one testing circuit and a control circuit, this rectification circuit is in order to connect external power source and equipment, so that the external power source of offer alternating current is reduced to the voltage of suitable equipment use from the high pressure limit of script, and carry out AC-DC conversion, electric current after step-down is switched to direct current again, then to obtain current flow efficiency sample value through voltage difference produced by this testing circuit, finally again sample value being sent to this control circuit decides whether automatic shutoff circuit, circuit is made to be able to be modulated according to current efficiency, automatic switching circuit, promote plating effect stable and lifting.

Preferably, this rectification circuit comprises a transformer and the rectifier being sequentially connected to external power source, and this transformer is allowed to be applied to equipment in order to limit voltage, and it is direct current that this rectifier then makes the AC conversion that outside is provided；

Preferably, this testing circuit comprises an inverter, a RC circuit and an ammeter, and this RC circuit connected in series is connected on circuit, and its input is connected with the output of this rectifier, and RC is series at the main circuit that this inverter is formed in parallel with this ammeter simultaneously.

Preferably, control circuit comprises one can program logic controller and a relay, the output of two this inverter being in parallel and this ammeter can be connected to this can program logic controller input, through this can program logic controller judge after, as Circuit Interrupt to be carried out, then this relay of interrupt signal system can be sent by program logic controller by this；

Preferably, this transformer system is preferably a kind of high frequency transformer, enables to bear larger external voltage；

Preferably, this rectifier is preferably a kind of high-frequency switching rectifier so that stable electric current can be had in electroplating process to export；

Preferably, inverter is preferably a kind of six frequencies reversely Schmidt trigger, comprises six IGCTs inside it；

Preferably, this RC circuit is a kind of resistance-capacitance circuit being made up of electric capacity and resistor coupled in parallel, is installed in series in the described adjustment circuit for printed circuit board (PCB)；

Preferably, this ammeter and this inverter parallel, in order to record current flow efficiency sample value；

Preferably, it is therefore intended that the unexpected voltage raising of protection or electric current lead to device damage before this RC circuit is arranged on this ammeter and this IGCT；

Preferably, this can program logic controller preferably one kind be carried out using existing power line, and data or information are write with digital signal processing method；

Therefore just can record current flow efficiency in circuit through this inverter in described testing circuit and ammeter, this sending to described control circuit can program logic controller judge, finally transmits the signal to this relay again.

One adjustment circuit being used for printed circuit board (PCB), for in existing plating circuit, it is characterized in that, add that one can program logic controller, a relay, an inverter and an ammeter in existing circuit, through this ammeter measurement circuit current flow efficiency sample value, after carrying out calculating through this inverter and target current efficiency sample value and comparing, by result be sent to this can program logic controller, finally can programmed logic calculator be decided whether to send interrupt signal to this relay by this.

Brief description

Fig. 1 is the operational flowchart according to a preferred embodiment of the present utility model.

Fig. 2 is the circuit diagram according to a preferred embodiment of the present utility model.

Specific embodiment

Hereinafter describe for disclosing the utility model so that those skilled in the art are capable of the utility model.Preferred embodiment in below describing is only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.The general principle of the present utility model defining in the following description can apply to other embodiments, deformation program, improvement project, equivalent and the other technologies scheme without departing from spirit and scope of the present utility model.

With circuit now, the adhesion of copper plate, uniform and delicate, tensile strength and elongation percentage etc. are required more and more harsh, therefore printed circuit board (PCB) also requires that more and more higher on each procedure, wherein electroplating work procedure has critical impact, the homogeneity of copper plate and uniformity to determine the quality of circuit board and whether continue to complete making on the success or failure with printed circuit board (PCB) again.Now in order to have reasonable plating effect mostly through addition additive in electroplate liquid, but the pH value of electroplate liquid can gradually rise over time in electroplating process, when the pH value of electroplate liquid raises, cathode current also can increase, although high current can produce thinner Shen shallow lake crystal grain, but too high electric current will make coating occur uneven it is impossible to obtain good effect.Plus electroplate liquid in the case that pH value constantly raises, its service efficiency will also result in lowly, has affected similarly for plating effect.

For maintaining the stablizing of electric current in electroplating process, the utility model system provides an adjustment circuit being used for printed circuit board (PCB), comprises：One rectification circuit, one testing circuit and a control circuit, wherein, the described adjustment circuit for printed circuit board (PCB) is inputted using alternating current as electric current, through described rectification circuit, alternating current is depressured, after frequency modulation and unsteady flow, electric current is allowed to be changed into controllable low pressure high frequency pulsed direct current, then electric current flows through described testing circuit, it is compared after Acquisition Circuit current flow efficiency, testing result sends to described control circuit the most at last, disconnecting circuit is decided whether by described control circuit, until electric current is restarted after returning to target sample value more automatically, realize the automatic Modulation of electric current in plating circuit, maintain electric current steady, promote plating effect.

Described rectification circuit comprises a transformer and a rectifier, wherein, this transformer is preferably a kind of high frequency transformer, its major function is that the alternating current as input power is carried out rectification and step-down, magnitude of voltage is enable to be reduced to the voltage of equipment, the main casket number ratio scratching group through inside of transformation (stream) that main reason is that transformer using high frequency to determine the voltage (stream) after changing, therefore when there being an external AC current fashionable, group can be scratched in a group of center by position, to produce an exchange flux, by other do not have alternating current pass through scratch group, produce voltage through sensing this exchange flux.Must be closely wound when making in order to avoid occurring doubting leakage scratching group plus these coils, so top layer concussion during voltage conversion is minimized.And high frequency transformer possesses high magnetic permeability, high resistance power and low coercivity, higher external voltage therefore can be born.Additionally, under the requirement of equal-wattage, the body chance of this transformer increases and decreases therewith, mainly pass through the characteristic of high resistivity, the incident characteristic being also vortexed little and little iron loss, therefore, described from phase modulation circuit itself just can as switch carry out current efficiency adjustment with control.This rectifier is then that the alternating current of input is switched to direct current, it is preferably a kind of high-frequency switching rectifier, have the function of filtering concurrently simultaneously, the mode of rectification has many kinds, and mostly adopt high-frequency switching rectifier now in the plating process, it is because that high-frequency switching rectifier possesses controllability, alternating current can be passed through anti-electromagnetic interference line filter, directly rectification, filtering, DC voltage conversion is become the high frequency square wave of tens of or hundreds of kHz by transformed device, through high frequency transformer isolation, step-down, then export DC voltage through High frequency filter.Therefore it is recognised that, through over sampling, compare, amplify and drive circuit with control converter in power tube dutycycle after, output voltage can be allowed to smooth, obtain the controlled low-voltage high-frequency electric current similar in appearance to impulse circuit, such current peak is much larger than general electric current several times to thousands of times, therefore carrys out thinner Shen shallow lake layer crystal grain in electroplating work procedure upper erengy band.

DC voltage after removing Burr removal and rectifying and wave-filtering through this rectifier, then can be toward described testing circuit diffluence, and described testing circuit comprises an inverter, a RC circuit and an ammeter, can be transferred to this inverter, the utility model adopts model

This inverter is preferably the anti-phase Schmidt trigger of one kind six frequency of 74F14, include six IGCTs, standard TTL input signal can be received and standard TTL output level is provided, slowly varying input signal can be changed into clearly non-jitter output signal by them, noise margin compare conventional inverter also relatively significantly.Also because each circuit comprises an IGCT to carry out positive feedback, can effectively accelerate slowly to input transition, and provide different input threshold voltages, to realize positively and negatively inputting threshold value.This IGCT can first in parallel with this ammeter after, then at contacting this RC circuit input position.This RC circuit is as the term suggests be exactly that resistance (R) is constituted with electric capacity (C); may be constructed smoothing circuit, differentiator, integrator, termination power, delay multiple circuit such as circuit, pulse current divider and middle shifting circuit according to its capacitance and resistance value size; it is widely used in different circuit; and in the utility model, be then to be used by the use of this RC circuit as phse conversion, buffer protection, step-down.It is particularly to be noted that, in the utility model this RC circuit using resistance in parallel with electric capacity after be connected in series with main circuit, the effect of electric capacity is exactly to prevent voltage jump, absorb the overvoltage of kurtosis, the electric energy of resistance then Absorption Capacitance, prevent the discharge current of electric capacity excessive, it is to avoid this IGCT in parallel therewith is caused to damage.Simultaneously when this RC circuit series winding is connected to this inverter, filter because electric capacity can't carry out intercepting for high-frequency signal, therefore this RC circuit can be considered and is equal to a big resistance, when there being extreme currents to pass through, electric current can be scaled through the millivolt step voltage measuring two ends, therefore we can be shunted through this RC circuit simultaneously, obtains the current efficiency sample value on circuit, after being compared with this ammeter, then result of calculation is sent to described control circuit.

Described control circuit comprises one can program logic controller and a relay, because in electroplating work procedure, electric current increases with bath pH values rising, bath pH values can raise again over time, therefore in the case of circuit continued operation, electric current will constantly be lifted, therefore we are intended to allow the continuous electric current raising return to predetermined target value, to reaching the smooth of electrodeposited coating through the mode of interrupt circuit.

In described inverter circuit, circuit can be allowed to have certain voltage difference when electric current passes through this RC circuit, through such voltage difference when by this ammeter, after current flow efficiency sample in Acquisition Circuit is straight, after being compared with target current efficiency sample value, by result send to this can program logic controller, can judge whether after disconnecting circuit by program logic controller through this, just interrupt signal can be sent to this relay.In other words, when normal operation circuit, the not start of this relay, is mainly carried out the actual loading electric current to circuit through inverter and is compared with the size of given reference current, when actual loading electric current is more than given load current, it is allowed to reduce by disconnecting this relay；If actual current is less than reference current, disconnecting relay makes circuit turn-on, increases electric current, to realize the purpose of adjust automatically electroplating current, lifting plating effect.

It is all mainly to realize control circuit through pulsed triggering circuit compared to general circuit, the utility model is then no controlled using pulsed triggering circuit, but be directed through this testing circuit to carry out, the alternating current being provided from indoor power supply, it is being converted into low-voltage high-frequency alternating current after this transformer, then switching to low-voltage high-frequency direct current through this rectifier, but because electric current kenel changes, electric current after transformation can produce harmonic wave and interference in circuit, in order to avoid interference and voltage x current suddenly are by the damage leading to, we use as buffer circuit being provided with this RC circuit, protect this inverter and this ammeter.But when low-voltage high-frequency direct current passes through this RC circuit with this inverter, because RC circuit has the effect of commutation simultaneously, and this inverter is equal to the reverse of this rectifier, the electric current of therefore last output can be converted into similar high frequency pulse dc electricity, being different from this general Schmidt trigger, to carry out comparison voltage poor, when sample rate current efficiency is more than target current efficiency, can can send interrupt signal through this to this relay by program logic controller, after this relay disconnects, output current can begin to decline, when less than target current efficiency, circuit will automatically be restarted.

It should be understood by those skilled in the art that the embodiment of the present utility model shown in foregoing description and accompanying drawing is only used as illustrating and is not intended to limit the utility model.The purpose of this utility model is completely and be effectively realized.Function of the present utility model and structural principle have been shown in an embodiment and have been illustrated, without departing under described principle, embodiment of the present utility model can have any deformation or change.

Claims (16)

1. one is used for the adjustment circuit of printed circuit board (PCB), it is characterized in that, comprise the rectification circuit sequentially connecting, one testing circuit and a control circuit, this rectification circuit is in order to connect external power source and equipment, so that the external power source of offer alternating current is reduced to the voltage of suitable equipment use from the high pressure limit of script, and carry out AC-DC conversion, electric current after step-down is switched to direct current again, then to obtain current flow efficiency sample value through voltage difference produced by this testing circuit, finally again sample value being sent to this control circuit decides whether automatic shutoff circuit, circuit is made to be able to be modulated according to current efficiency, automatic switching circuit, promote plating effect stable and lifting.

2. the adjustment circuit for printed circuit board (PCB) as claimed in claim 1, it is characterized in that, this rectification circuit comprises a transformer and the rectifier being sequentially connected to external power source, this transformer is allowed to be applied to equipment in order to limit voltage, and it is direct current that this rectifier then makes the AC conversion that outside is provided.

3. the adjustment circuit for printed circuit board (PCB) as claimed in claim 1 is it is characterised in that this testing circuit comprises an inverter, a RC circuit and an ammeter, the circuit after wherein this inverter is in parallel with this ammeter again with this RC circuit connected in series.

4. the adjustment circuit for printed circuit board (PCB) as claimed in claim 1, it is characterized in that, this control circuit comprises a programmable logic controller and a relay, the output of two inverters being in parallel and this ammeter is connected to the input of this programmable logic controller, after judging through this programmable logic controller, as Circuit Interrupt to be carried out, then this relay of interrupt signal system is sent by this programmable logic controller.

5. the adjustment circuit for printed circuit board (PCB) as claimed in claim 2, it is characterised in that this transformer system is a kind of high frequency transformer, enables to bear larger external voltage.

6. the adjustment circuit for printed circuit board (PCB) as claimed in claim 2 is it is characterised in that this rectifier is a kind of high-frequency switching rectifier so that stable electric current can be had in electroplating process to export.

7. the adjustment circuit for printed circuit board (PCB) as claimed in claim 3, it is characterised in that this inverter is a kind of six frequencies reversely Schmidt trigger, comprises six IGCTs inside it.

8. the adjustment circuit for printed circuit board (PCB) as claimed in claim 3 is it is characterised in that this ammeter and this inverter parallel, in order to record current flow efficiency sample value.

9. the adjustment circuit for printed circuit board (PCB) as claimed in claim 4 utilizes existing power line it is characterised in that this programmable logic controller is one kind, and data or information are write with digital signal processing method.

10. the adjustment circuit for printed circuit board (PCB) as claimed in claim 4, it is characterized in that, current flow efficiency in circuit can be recorded through this inverter in described testing circuit and ammeter, this programmable logic controller sending to described control circuit judges, finally transmits the signal to this relay again.

11. 1 adjustment circuits being used for printed circuit board (PCB), for in existing plating circuit, it is characterized in that, a programmable logic controller, a relay, an inverter and an ammeter is added in existing circuit, through this ammeter measurement circuit current flow efficiency sample value, after carrying out calculating through this inverter and target current efficiency sample value and comparing, result is sent to this programmable logic controller, finally decides whether to send interrupt signal to this relay by this programmable logic computer.

12. adjustment circuits for printed circuit board (PCB) as claimed in claim 11 are it is characterised in that this ammeter and this inverter parallel, and can have a RC circuit by crossfire in its input.

13. adjustment circuits for printed circuit board (PCB) as claimed in claim 11 are it is characterised in that after this inverter is in parallel with this ammeter, its output is connected with the input of this programmable logic controller.

14. adjustment circuits for printed circuit board (PCB) as claimed in claim 11 are it is characterised in that the output of this programmable logic controller is connected to the input of this relay.

15. adjustment circuits for printed circuit board (PCB) as claimed in claim 11 are it is characterised in that the described adjustment circuit system for printed circuit board (PCB) to be controlled this relay whether disconnecting circuit automatically through this programmable logic controller.

16. adjustment circuits for printed circuit board (PCB) as claimed in claim 11 comprise the six frequencies reversely Schmidt trigger of six IGCTs it is characterised in that this inverter is a kind of inside.