ITRN20130032A1 - ELECTRICAL AND / OR ELECTRONIC DEVICE INCLUDING AT LEAST A PRINTED CIRCUIT. - Google Patents

Description

Ing. Andrea Busca isc. Register n ° 1095 B

Owner: REBERNIG SUPERVISIONI SRL, Viale G. Fanin, 48 -

40127 Bologna (BO), Italy.

Title: Electric and / or electronic device

comprising at least one printed circuit.

5 * * * * *

DESCRIPTION

The present invention relates to a device

electric and / or electronic comprising at least one circuit

printed. The present invention has been realized with particular reference to lighting devices,

more preferably to those for public lighting,

like the lighting of streets and tunnels, however not

other applications are excluded. The present invention is

particularly suitable for electrical and / or electronic devices including LEDs, however it is not excluded

the application in association with other types of loads

electrical and / or electronic, hereinafter referred to as

simply "loads", in addition to or as an alternative to

LED.

20 Known lighting devices are

commonly made according to the scheme of figure 1.

As you will notice, the generic device for

illumination shown is indicated as a whole with

the reference number 1, and comprises an input 5 for 25 for the electrical connection to a source of Ing. Andrea Busca isc. Register n ° 1095 B

power supply 3, such as for example the electrical network of

public supply, which generally supplies current to

high voltage, for example greater than 100V, commonly

at 100-120V 220-240V or 390-410V, and mentioned below for simplicity and for our convention, at high voltage.

The high voltage current from input 5

passes to a first stage 8 of

filtering / protection / straightening. Subsequently the

current passes through a power factor 10 regulation stage 10 (called PFC = Power Factor

Corrector). Then we move on to a transformer

12 which lowers the voltage, for example to 24-48V, and di

fact acts as a separating element between two circuits

13 and 14, called high voltage and low voltage respectively for simplicity.

The low voltage circuit 14 downstream of the

transformer 12 supplies one or more loads 20, for example

example LEDs, managed by said control devices 15

"Driver". The LEDs 20 belong to a printed circuit 20 30 commonly called PCB.

This type of power system is

used for many years, however in the face of

modern needs turns out to have various disadvantages. This

system has in fact a low efficiency due to the high number of components, which inevitably Ing. Andrea Busca isc. Register n ° 1095 B

have a yield and therefore are subject to losses of

power. In addition, a large number of components is

subject to a higher probability of failure, so it is

less reliable.

5 The applicant further notes that, in the case of

LEDs, or similar loads, placed in series with the

transformer, there is an explicit limit to their number a

due to the low voltage of the circuit 14. The only one

currently possible solution to increase the number of the 10 applicable loads is to increase the number of

transformers and / or drivers, and then to multiply the

low voltage circuits. However, this increases the number

of the components and then lower further

efficiency and reliability, increasing management costs, as well as construction costs, of course.

It is also noted that the known solution requires

plenty of space, contrary to the ever increasing

request for miniaturization.

A general purpose of the present invention is therefore to solve in whole or in part i

problems of the prior art.

A preferred object of the present invention is

to provide an electrical device and / or

electronic of greater efficiency.

25 Another preferred purpose of the present Ing. Andrea Busca isc. Register n ° 1095 B

invention is to provide an electrical device

and / or electronic with a smaller number of components.

A further preferred object of the present

invention is to provide an electrical and / or electronic device 5 which comprises a number of loads

greater.

Another further purpose of the present

invention is to provide an electrical device

and / or electronic with high safety for people and 10 high reliability.

According to its first general aspect,

considered both associable and independent from others

general aspects, the present invention relates to

the electrical isolation of an electrical and / or electronic 15 device. In particular, the invention refers to

an electric and / or electronic device comprising

- at least one source of electric current or

at least one input for electrical connection ad

at least one source of electric current,

20 - a printed circuit

characterized in that it is devoid of a

transformer device placed between the at least one

source and at least one printed circuit, and the circuit

printed is at least partially electrically insulated.

25 The applicant has in fact sensed that by moving Ing. Andrea Busca isc. Register n ° 1095 B

the function of electrical isolation of the loads from

transformer directly to the printed circuit itself yes

have numerous advantages, including the reduction of

components and the ability to power a number of 5 higher loads thanks to the higher voltage

available.

Preferably the at least one printed circuit is

powered with substantially the same voltage as the

electrical source and / or input for electrical connection 10 to at least one source of electrical current.

For example, it is possible to make the device as a

single circuit substantially at the same voltage.

According to some preferred embodiments

of the invention the printed circuit is at least in part 15 electrically isolated by at least two portions

electrically insulating, superimposed in the sense of his

thickness, arranged to cover at least partially at least

an external electrical contact track of the circuit

printed, from its side facing outwards.

20 It is generally observed that the at least two portions

they can at least be considered to have effect

electrically insulating for the purposes of the present invention

if the wall formed by them is subjected, in the sense of

overlapping them, at a ddp of 400V a current of less than 30mA is passed through by 25

Ing. Andrea Busca isc. Register n ° 1095 B

The applicant has indeed experimentally

found that the presence of at least two insulating portions

offers a higher level of electrical insulation e

therefore very safe.

5 According to a general preferable characteristic

the printed circuit comprises at least one side at least

partially thermally conductive, bound to go

in contact with a heat sink, where in

corresponding to said contact side there is an elastically deformable interface portion 10 e

thermally conductive to promote adherence to the

printed circuit board to the heat sink and transfer to

it of its warmth.

In this way it is also possible to advantageously manage 15 the thermal dissipation since

the elastically deformable interface portion

ensures greater grip and therefore greater

heat exchange surface with the heatsink.

According to some particularly advantageous embodiments 20 of the device, the portion

of elastically deformable interface is also

electrically insulating and coincides with one of at least two

electrically insulating portions of the PCB overlapping each other

them in the sense of thickness.

25 In this case preferably at least two Ing. Andrea Busca isc. Register n ° 1095 B

electrically insulating portions are interposed between

at least one electrical connection track of the circuit

molded and the heatsink, where the most distal portion

with respect to the tracks it is elastically more deformable than the 5 most proximal portion and forms said portion of

interface.

According to some preferred embodiments the

electrical and / or electronic device is a device of

lighting comprising at least one cooling fin heat sink 10, and circuitry

printed comprises a plurality of LEDs arranged in

correspondence of a plurality of said fins. In

in particular, the LEDs are aligned with said fins so as to

transmit to them the heat generated in a more direct way.

According to a second general aspect,

considered both associable and independent from others

general aspects, the invention concerns insulation

electrical circuit board.

20 In particular, the invention refers to a

substantially tablet-shaped printed circuit board

having two main sides opposite in the direction of the

thickness of the tablet, the circuit board

comprising a plurality of electrical connection tracks 25, characterized in that at least one track, Ing. Andrea Busca isc. Register n ° 1095 B

proceeding in the direction of the thickness and according to a

direction that goes from inside the printed circuit towards a

external area to one of the two main sides, it is not

surmounted in said direction by no other track and is therefore called "external track" for simplicity,

characterized in that it dictates at least one track

external is at least in part electrically insulated from said

external zone by at least two portions electrically

insulators superimposed on each other in said 10 thickness direction.

Advantageously, therefore, the printed circuit

according to the present invention it has at least one side

main electrically insulated with respect to one of its

external zone by at least two electrically insulating layers 15.

Preferably said at least two portions

electrically insulating form an electrically wall

insulation which entirely covers at least one of said two

main sides, however, it is not excluded that the electrically insulated area 20 may be less than a whole

main side.

In general it is preferable that the portions

electrically insulating are different layers of one

same material or of different materials, or that they are 25 portions of the same layer of material each with Ing. Andrea Busca isc. Register n ° 1095 B

different physical and / or chemical and / or mechanical properties

from the other portion.

According to a third general aspect,

considered both associable and independent of other 5 general aspects, the invention concerns conductivity

thermal circuit board.

In particular, the invention refers to a

printed circuit characterized in that it comprises

at least a portion for transmitting the heat to an external zone 10 of the circuit, said portion being

made with a thermally conductive material and

elastically deformable, placed to form a

interface of the printed circuit with said external zone.

For example, said interface is the outermost portion of 15 a main side of the printed circuit.

Advantageously, this printed circuit is capable of

transmit the heat that generates a lot to the outside

effectively as the material elastically

deformable, for example, it is able to adhere to a heat sink, optimizing the contact and therefore the

thermal transmission.

It is reiterated that this third aspect can be

associated or independent of an aspect of isolation

electrical circuit board.

25 In the event that there is also insulation Ing. Andrea Busca isc. Register n ° 1095 B

electrical, it is preferable that the interface portion

is also electrically insulating and / or placed on at least one

electrically insulating portion. For example the portion

interface can coincide with one of the at least two 5 electrically insulating portions described with

reference to the second aspect of the invention on

mentioned.

According to a fourth general aspect,

considered both associable and independent from other 10 general aspects, the present invention relates to

realization of the surface finish of the circuits

printed. In particular, it concerns a procedure of

realization of a printed circuit comprising the

steps of providing at least one rigid tablet of 15 support with at least two main external sides in the direction

of the thickness of the tablet, on at least one of which is

placed a plurality of electrical contact tracks,

characterized in that at least one zone with at least

a track of said at least one main side is covered 20 with at least a first layer of leveling material

in such a way as to form a first surface

substantially flat, subsequently on said

substantially flat surface is applied at least one

second layer of material, equal to or different from said leveling material, to form a second Ing. Andrea Busca isc. Register n ° 1095 B

substantially flat surface.

Additional features and benefits of the

present invention will be better understood from the following

detailed description of its preferred embodiments 5, made with reference to the attached drawings and

given as an indication and not limitative. In such

drawings:

- figure 1 is a schematic representation

of a known lighting device comprising LEDs 10 soldered on a known printed circuit;

Figure 2 is a schematic representation

of a lighting device according to the present

invention;

- Figures 3a and 3b schematically show and 15 in perspective view respective main sides of a

PCB;

- Figures 4a and 4b schematically show in

perspective view the two main sides of a second PCB

the present invention;

20 - figures from 5 to 16 represent the phases of

realization of the PCB of figure 4 through sections

schematic;

- Figures 17 to 20 represent

schematically alternative embodiments of 25 printed circuits according to the present invention; and Ing. Andrea Busca isc. Register n ° 1095 B

- figure 21 is a schematic view

according to a sectional view, a part of a device

lighting according to the present invention.

In the following, embodiments 5 and variants of the present invention will be described, where elements

equal or similar to those illustrated in figure 1 with

reference to the known art will be indicated with lo

same reference number.

In the following we will also use the abbreviation PCB in a generalized way to indicate any type of

printed circuit.

With reference to Figure 2, a

electrical and / or electronic device 101 which differs

from the device 1 of Figure 1 due to the fact that it does not include any transformer, so that it coincides with a

single circuit 113 where all the parts are placed

basically at the same voltage, basically

coinciding with the voltage of the source of

power supply 3 (where "substantially" means that at least the passage in stages 8 must be taken into account

and 10). Said tension (or called tension after the passage

in said stages) is preferably ≥ (greater than or equal to

di) 100V, more preferably ≥ 200V and even more

preferably ≥ 350V.

25 The LEDs 20 in this case belong to at least one Ing. Andrea Busca isc. Register n ° 1095 B

PCB 130 which differs from common PCB 30 such as those of

figure 1 due to the fact that it is electrically isolated.

Figures 3a and 3b show, according to views

perspective from different angles, the PCB 30 known where 5 we see the presence of two main sides 35 and 40, up

one of which some LEDs are soldered 20 and on both

which are present electric connection tracks 45

suitable for the transport of electric current. The slopes and i

LEDs are supported by a rigid support tablet 10 32 In addition there are holes 47 for connection between

the two sides 35 and 40. All this causes the PCB 30 not

is electrically insulated and has external surfaces

full of roughness.

Figure 4 shows the PCB 130 of figure 2 in 15 which shows that the tracks 45 on the side opposite to the one on

to which the LEDs 20 are soldered have been electrically

electrically insulated by means of two covering layers

insulators 50 and 60, which also level the various roughnesses

making a flat outer surface 85.

20 The outermost electrically insulating layer 60

it is preferably more elastic than the innermost layer

50, which may or may not be at all. To

example, it is possible to create the insulation layer

internal 50 with an epoxy resin, and the 25 external insulation layer 60 with a silicone resin.

Ing. Andrea Busca isc. Register n ° 1095 B

More details of the insulation cover

electric outdoor to the slopes can be included from

preferred method of making PCB 130 of

described below.

5 With reference to Figure 5, in a first step

a tablet of

support 32 coated on both sides by respective

layers of copper 70 and 72. Tablet 32 is made of

electrically insulating material and is preferably 10 rigid. Some trade names of suitable materials are

the FR4 and the CEM3.

With reference to Figure 6, on at least one,

preferably on both sides it is deposited on the

copper a layer of photoreactive material 74 capable of 15 polymerizing when exposed to light. A film

photographic 75 containing the tracks you want

realize is placed on top of the PCB and then illuminated

(The arrows L in the figure indicate the application of light).

With reference to Figure 7, the non-photoreactive material is removed by means of a chemical bath 20

cured.

Subsequently, with a second chemical bath yes

eliminates the copper left uncovered as shown in the figure

8, then the residue of reactive photo 25 material 74 is eliminated, obtaining the uncovered copper tracks 45 as Ing. Andrea Busca isc. Register n ° 1095 B

shown in figure 9.

Figure 10 shows the tracks 45 on both

sides of the PCB, which are obtained if the

process with both copper layers 70 and 72.

5 Figure 11 shows the realization of the holes of

connection 47 between the two main sides of the PCB.

In the step of Figure 12, the holes 47 are filled

of copper to create electrical connections 48 between the tracks

45 of the two opposite sides.

10 With reference to Figure 13, the phase in

which has a protective layer 77 on both sides,

for example for antioxidant and compaction purposes.

Typically this is the final stage of

realization of the known PCBs 30. However, since 15 the protective layer 77 is generally thin and in every

case provides substantially electrical insulation

negligible, its application is for the second PCB

the optional invention, and the procedure continues with the

following electrical isolation steps.

20 With reference to figure 14, on one of the two

main sides 140 of the PCB is applied the layer

electrically insulating material 50 so as to

cover the roughness and form a first surface

flat 80. The layer 50 is integral with the PCB and is deposited 25 for example by screen printing.

Ing. Andrea Busca isc. Register n ° 1095 B

According to some variants, it is not excluded that it is

protective layer 77 is made of electrically material

insulating and deposited to form the layer 50 itself.

With reference to Figure 15, the electrically insulating layer is applied to the flat surface 5 80

60, more elastically deformable than the underlying layer

50.

In this way it will be noted that the layers 50 and 60

they form a main side 140 of the electrically insulated PCB 130 10 for its entire extension. According to some

possible variants of the extension of the isolated part of the

side 140 could be smaller, being for example

limited to one or more of its areas.

The layer 60 also provides a flat surface 15 85 useful for providing an elastic interface of

contact with elements not belonging to the PCB.

It is observed that the electrically insulating layers

50 and 60 are preferably thermally conductive,

that is, they are able to transmit heat.

20 As shown in figure 16, on the 135 side of the PCB

opposite to the electrically insulated side 140 i apply

components, for example for welding, which can be

any type of load, such as LEDs 20.

At this point the PCB 130 is finished.

25 In the following, forms of implementation will be described Ing. Andrea Busca isc. Register n ° 1095 B

alternatives and variants of the present invention, where

elements the same or similar to those illustrated so far

will be indicated with the same reference number or

with the same number increased by 100 or a multiple of 5.

Figure 17 shows a PCB 230 in one form

of alternative embodiment of the present invention, which

differs from PCB 130 of figure 16 in that the

the electrically insulated side 240 comprises a third electrically insulating layer 10 55. The layer 55 for example can

be of the same material as layer 50. Second

some possible variations, the outermost elastic layer

60 may not be electrically insulating. In such

case according to some of these variants it could however 15 be thermally conductive.

Figure 18 shows a second PCB 330

another alternative form of implementation of this

invention, which differs from the previous ones by the fact

which includes multiple layers of copper 70, 72 and 73 and 20 support tablets 32 and 33. This ensures that there are

45 slopes arranged on more than two levels compared to the

thickness.

As you will notice, proceeding in the direction S

of the thickness and according to a direction that goes from the inside of the 25 PCB 330 towards the area 341 outside the electrically side Ing. Andrea Busca isc. Register n ° 1095 B

block 340 meets a layer of slopes 45 and more

close to said external area 341, i.e. such that there is no

are other tracks interposed between them and this external area.

for this reason the tracks 45e are called "external tracks".

5 On the external slopes it can be placed

optionally the thickness of protective material 77, but

what matters for the purposes of the present invention is that

they are surmounted by two electrically insulated layers

50 and 60.

10 It is observed that the tracks 45 of the forms of

implementation previously described and covered by the two

electrically insulating layers 50 and 60 are from

consider themselves "external", as they are not surmounted by others

tracks proceeding from inside the PCB towards said insulating layers 15 50 and 60, but this description was previous

omitted as deemed unnecessary for understanding

of those cases.

Figure 19 shows a PCB 430 according to another

alternative embodiment of the present invention, which differs from the previous ones by the fact

which comprises a single layer of copper 70 and therefore only one

level of slopes 45 arranged on one side 435 of the

tablet 32 on which the LEDs 20 are also arranged. Dal

since the support tablet 32 is necessarily 25 made of an electrically insulating material, to isolate Ing. Andrea Busca isc. Register n ° 1095 B

electrically according to the present invention the tracks e

the loads on the electrically insulating side 440 is

just add one of the two layers on this side

50 or 60 on board 32. These tracks are also to be considered 5 “external” in the sense previously mentioned.

Figure 20 shows a PCB 530 according to a

further alternative embodiment of the present

invention, which differs from the previous ones by the fact

which does not comprise an electrically insulating double layer 10 on the side 540 opposite the LEDs 20 but only one

elastically deformable layer 60 (according to some

possible variants said layer may or may not be

electrically insulating).

This embodiment can be used 15 for example when there are no particular requirements for

electrical isolation but an interface is desired

elastic 85 for example to increase adherence to a

other component. In case the layer elastically

deformable 60 is thermally conductive this can 20 facilitate heat dissipation of the PCB for

transmission to another body in contact with

interface 80.

With reference now to Figure 21 it is illustrated

with greater detail the part of an electric and / or electronic device 25 101 of figure 2 in which Ing. Andrea Busca isc. Register n ° 1095 B

applied a PCB 130.

This electrical and / or electronic device is a

lighting device and includes in addition to the PCB 130

also a heatsink device 90. The heatsink 5 90 has a series of cooling fins

91, and the LEDs 20 are arranged in alignment at least at

some of said fins. Heat is transmitted by the LEDs

to the fins thanks to the contact of the surface of

elastic and thermally conductive interface 85 with the bottom 10 86 of the heatsink 90. The heat in particular

reaches this interface thanks to the fact that the layers

electrically insulators 50 and 60 are thermally

conductive. It is also noted that the links

electric circuits 48 between the various levels of tracks 45 can 15 themselves favor the passage of heat towards the

electrically insulating layers 50 and 60.

Although only forms of

implementation and variants with only one side of the PCB

electrically insulated, embodiments with both main sides totally o are not excluded

partially electrically insulated with at least two layers

of electrically insulating material to cover at least

partially called sides. In this case, preferably the

electrically insulating layers are absent in correspondence of the LEDs and / or other loads. It is also Ing. Andrea Busca isc. Register n ° 1095 B

possible to have LEDs and / or other loads on both sides

main components of the PCB.

It is also observed that, although it has been so far

having described the presence of at least two layers of electrical insulation 5, it is more appropriate to speak of portions of

isolation, thus understanding both the case in

which portions are layered, is that in which, in

addition or alternatively, they are diversified areas

of the same layer. For example, the portions of the same layer of material could have in this sense

each physical and / or chemical and / or mechanical property

different from each other.

In general it is also observed that up to now the

the only loads belonging to the PCB that have been 15 described are the LEDs, however in addition to or in

any type of load can be an alternative to them

used.

Always in general it is observed that although the

screen printing is now the preferred technology for 20 applying the electrically insulating portions to the PCB, in

what guarantees that they remain in solidarity and adherence

over time, no other methodology is excluded,

including application in the form of adhesive tapes and / or

gluing and / or casting and / or co-molding. Although 25 are therefore preferred solutions in which the portions of Ing. Andrea Busca isc. Register n ° 1095 B

insulation 50 and 60 fully adhere to each other (i.e.

over their entire surface) permanently, not

it is not even excluded that one or more of them are not

integral with the PCB, although considered part of it for the 5 purposes of the invention. For example the portion of

elastically deformable interface 60 could be

a trampoline placed on the layer electrically

leveling insulation 50.

Finally, it can be observed that although 10 or 10 insulations consisting of 2 or 3 layers have been described up to now

electrically insulating portions superimposed in the sense

of thickness, their number can be even greater.

Of course, the forms of implementation and the

variants described and illustrated up to now are purely for illustrative purposes and for those skilled in the art, however

meet specific and contingent needs, will be able

make numerous modifications and variations, including ad

for example the combination of said embodiments e

variants, all however contained within the scope of 20 protection of the present invention as defined by

following claims.

Claims (3)

Ing. Andrea Busca isc. Register n ° 1095 B CLAIMS 08.05.2015 1. Electric and / or electronic device comprising 5 - at least one source of electric current (3) or at least one input (5) for the electrical connection ad at least one source of electric current (3), - a printed circuit (130, 230, 330, 430, 530) characterized in that it is devoid of a transformer device 10 placed between the at least one source (3) and at least one printed circuit (130, 230, 330, 430, 530), and the printed circuit is at least partially electrically insulated (130, 230, 330, 430, 530). 2. Device according to claim 1, 15 characterized in that the at least one circuit printed (130, 230, 330, 430, 530) is powered substantially with the same voltage as the source electrical and / or input (5) for connection to at least one source of electric current 20 (3). 3. Device according to any one of the preceding claims, characterized in that the printed circuit board (130, 230, 330, 430, 530) is at least partly electrically insulated by at least two 25 electrically insulating portions (50, 60), superimposed Ing. Andrea Busca isc. Register n ° 1095 B in the sense of its thickness (S), willing to cover at least partially at least one outer race (45, 45e) of electrical contact of the printed circuit board (130, 230, 330, 430, 530). 5 4. Device according to any one of the preceding claims, characterized in that the printed circuit (130, 230, 330, 430, 530) comprises at least one side at least partially thermally conductive (140, 240, 340, 440, 540), intended to contact a heat sink (90), where in correspondence of said contact side there is a elastically deformable interface portion (85) e thermally conductive to promote adherence to the printed circuit board (130, 230, 330, 430, 530) to the 15 heatsink (90) and the transfer to it of his heat. 5. Device according to claim 4, characterized in that the interface portion (85) elastically deformable is electrically insulating 20 and coincides with one of the at least two portions electrically insulating (50, 60) of claim 3. 6. Device according to any one of the preceding claims characterized in that it is a lighting device (101) comprising at least 25 a heat sink (90) with cooling fins Ing. Andrea Busca isc. Register n ° 1095 B (91), and the printed circuit board (130, 230, 330, 430, 530) comprises a plurality of LEDs (20) arranged in correspondence of a plurality of said fins (91). 7. Printed circuit substantially in the form of 5 tablets having two main sides (135, 235, 335, 435, 535, 140, 240, 340, 440, 540) opposed in the direction of thickness of the tablet, the printed circuit board (130, 230, 330, 430, 530) comprising a plurality of tracks of electrical connection (45, 45e), characterized in that at least one track (45, 45e), proceeding in the direction of thickness (S) and according to a direction that goes from inside the printed circuit to an external area (341) to one of the two main sides (135, 235, 335, 435, 535, 140, 240, 340, 440, 540), is not surmounted in said 15 verso by any other track and is therefore called for simplicity "external track" (45, 45e), characterized by fact that where said at least one outer race (45, 45e) is at least partially electrically isolated from said zone external by at least two electrically insulating portions 20 (50, 60) superimposed on each other in said direction of the thickness (S). , characterized by the fact that the circuit printed (130, 230, 330, 430, 530) comprises at least one at least partially thermally conductive side (140, 240, 340, 440, 540), intended to come into contact with 25 a heat sink (90), where in correspondence with Ing. Andrea Busca isc. Register n ° 1095 B said contact side is present a portion of interface (85) elastically and thermally deformable conductive to facilitate the adhesion of the printed circuit (130, 230, 330, 430, 530) to the heatsink (90) and the transfer of its heat to it. 8. Circuit according to the preceding claim, characterized in that the at least two portions electrically insulating (50, 60) and the portion of elastically deformable and thermally conductive interface (85) 10 are placed on the same side of the board. 9. Circuit according to claim 7 or 8, characterized in that the interface portion (85) elastically deformable is electrically insulating and coincides with one of the at least two electrically insulating portions 15 (50, 60). 10 8. Circuit as in claim 7 or 8 or 9 above, characterized by the fact that said at least two electrically insulating portions (50, 60) form one electrically insulating wall which entirely covers 20 at least one of said two main sides (135, 235, 335, 435, 535, 140, 240, 340, 440, 540). 11 9. Circuit according to claim 7 or 8 or 9 or 10, characterized by the fact that the portions electrically insulators (50, 60) are 25 different layers of the same material or of different materials, or they are Ing. Andrea Busca isc. Register n ° 1095 B portions of the same layer of material each with different physical and / or chemical and / or mechanical properties from the other portion. 12 10. Printed circuit according to any 5 of the preceding claims characterized by the fact which comprises at least a transmission portion of the heat (60) to an external area of the circuit (341), called portion being made with a thermally material conductive and elastically deformable, arranged to form 10 an interface (85) of the printed circuit with said zone external (341). 13 11. Circuit according to claim above characterized in that said portion of interface (60, 85) is also electrically insulating and / or 15 is placed at least on an electrically insulating portion (50). 14 12. Circuit according to claim previous, characterized in that the portion of interface (60, 85) coincides with one of the at least two 20 electrically insulating portions (50, 60) of one any of claims 7 to 9 10. 15 13. Procedure for making a printed circuit according to any one of preceding claims, comprising the steps of 25 preparing at least one rigid tablet (32, 33) by Ing. Andrea Busca isc. Register n ° 1095 B support with at least two main external sides in the direction of the thickness (S) of the tablet, on at least one of the which a plurality of contact tracks are placed electric (45, 45e), characterized in that at least 5 one zone (140, 240, 340, 440, 540) with at least one track (45, 45e) of said at least one main side is covered with at least a first layer of leveling material (50) in such a way as to form a first surface substantially flat (80), subsequently on said 10 substantially flat surface (80) it is applied at least a second layer of material (60), equal to or different from said leveling material, to form a second substantially flat surface (85). 15 Ing. Andrea Busca isc. Register n ° 1095 B CLAIMS 08.05.2015 1. Electric and / or electronic device comprising 5 - at least one source of electric current (3) or at least one input (5) for the electrical connection ad at least one source of electric current (3), - a printed circuit (130, 230, 330, 430, 530) characterized in that it is devoid of a transformer 10 placed between the at least one source (3) and at least one printed circuit (130, 230, 330, 430, 530), and the printed circuit is at least partially electrically insulated (130, 230, 330, 430, 530). 2. Device according to claim 1, 15 characterized in that the at least one circuit printed (130, 230, 330, 430, 530) is powered substantially with the same voltage as the source electrical and / or input (5) for connection to at least one source of electric current 20 (3). Device according to any one of the preceding claims, characterized in that the printed circuit (130, 230, 330, 430, 530) is at least partially electrically insulated by at least two 25 electrically insulating portions (50, 60), superimposed - 1 Ing. Andrea Busca isc. Register no. 1095 B in the sense of its thickness (S), arranged to cover at least partially at least one outer electrical contact track (45, 45e) of the printed circuit (130, 230, 330, 430, 530). 5 4. Device according to any one of the preceding claims, characterized in that the printed circuit (130, 230, 330, 430, 530) comprises at least one side at least partially thermally conductive (140, 240, 340, 440, 540), intended 10 to go into contact with a heat sink (90), where at said contact side there is an elastically deformable and thermally conductive interface portion (85) to favor the adhesion of the printed circuit (130, 230, 330 , 430, 530) to the 15 heatsink (90) and the transfer of its heat to it. 5. Device according to claim 4, characterized in that the elastically deformable interface portion (85) is electrically insulating 20 and coincides with one of the at least two electrically insulating portions (50, 60) of claim 3. 6. Device according to any one of the preceding claims characterized in that it is a lighting device (101) comprising at least 25 a heat sink (90) with cooling fins - 2 Ing. Andrea Busca isc. Register No. 1095 B (91), and the printed circuit (130, 230, 330, 430, 530) comprises a plurality of LEDs (20) arranged in correspondence with a plurality of said fins (91). 7. Printed circuit substantially in the form of 5 tablets having two main sides (135, 235, 335, 435, 535, 140, 240, 340, 440, 540) opposite in the direction of the thickness of the tablet, the printed circuit (130, 230 , 330, 430, 530) comprising a plurality of electrical connection tracks (45, 45e), characterized in that at least one track (45, 45e), proceeding in the direction of the thickness (S) and in a direction that goes from 'inside of the printed circuit towards an external area (341) to one of the two main sides (135, 235, 335, 435, 535, 140, 240, 340, 440, 540), is not surmounted in said 15 verso by any other track and is therefore called "external track" (45, 45e) for simplicity, where said at least one external track (45, 45e) is at least partially electrically isolated from said external zone by at least two electrically insulating portions (50, 60) superimposed 20 to each other in said thickness direction (S), characterized by the fact that the printed circuit (130, 230, 330, 430, 530) comprises at least one side at least partially thermally conductive (140, 240, 340, 440, 540), intended to come into contact with a heat sink 25 (90), where at said side of - 3 Ing. Andrea Busca isc. Register n ° 1095 B contact there is an interface portion (85) elastically deformable and thermally conductive to favor the adhesion of the printed circuit (130, 230, 330, 430, 530) to the heat sink (90) and the transfer to it 5 of its warmth. 8. Circuit according to the preceding claim, characterized in that the at least two electrically insulating portions (50, 60) and the elastically deformable and thermally conductive interface portion (85) 10 are placed on the same side of the board. 9. Circuit according to claim 7 or 8, characterized in that the elastically deformable interface portion (85) is electrically insulating and coincides with one of the at least two electrically insulating portions 15 (50, 60). 10. Circuit as in claim 7 or 8 or 9, characterized in that said at least two electrically insulating portions (50, 60) form an electrically insulating wall which entirely covers at least one 20 of said two main sides (135, 235, 335, 435, 535, 140, 240, 340, 440, 540). 11. Circuit according to claim 7 or 8 or 9 or 10, characterized in that the electrically insulating portions (50, 60) are different layers of 25 the same material or of different materials, or they are - 4 Ing. Andrea Busca isc. Register No. 1095 B portions of the same layer of material each with physical and / or chemical and / or mechanical properties different from the other portion. 12. Printed circuit according to any one of the 5 preceding claims, characterized in that it comprises at least a portion for transmitting heat (60) to an external area of the circuit (341), said portion being made of a thermally conductive and elastically deformable material, placed to form 10 an interface (85) of the printed circuit with said external zone (341). 13. Circuit according to the preceding claim characterized in that said interface portion (60, 85) is also electrically insulating and / or 15 is placed at least on an electrically insulating portion (50). 14. Circuit according to the preceding claim, characterized in that the interface portion (60, 85) coincides with one of the at least two 20 electrically insulating portions (50, 60) of any one of claims 7 to 10. 15. Process of realization of a printed circuit according to any one of the preceding claims, comprising the steps of providing at least 25 a rigid support tablet (32, 33) with at least two - 5 Ing. Andrea Busca isc. Register n ° 1095 B external main sides in the direction of the thickness (S) of the board, on at least one of which there is a plurality of electrical contact tracks (45, 45e), characterized in that at least one area (140, 240, 5 340, 440, 540) with at least one track (45, 45e) of said at least one main side is covered with at least a first layer of leveling material (50) in such a way as to form a first substantially flat surface (80), subsequently on said substantially flat surface 10 (80) at least a second layer of material (60), equal to or different from said leveling material, is applied to form a second substantially flat surface (85). 15 - 6 Ing. Andrea Busca isc. Register n ° 1095 B Owner: REBERNIG SUPERVISIONI SRL, Viale G. Fanin, 48 - 40127 Bologna (BO), Italy. Title: Electric and / or electronic device comprising at least one printed circuit. 5 * * * * * DESCRIPTION 08.05.2015 The present invention relates to an electric and / or electronic device comprising at least one printed circuit. The present invention has been realized with particular reference to lighting devices, more preferably to those for public lighting, such as the lighting of roads and tunnels, however other applications are not excluded. The present invention is particularly suitable for electrical and / or electronic devices comprising LEDs, however the application in association with other types of electrical and / or electronic loads, hereinafter simply referred to as "loads", in addition or alternatively, is not excluded. to the LEDs. 20 Known lighting devices are commonly made according to the diagram of figure 1. As it will be noted, the generic lighting device shown is indicated as a whole with the reference number 1, and comprises an input 5 by 25 for the electrical connection to a source of - 1 Ing. Andrea Busca isc. Register n ° 1095 B power supply 3, such as for example the public supply electricity network, which generally supplies high voltage current, for example greater than 100V, commonly at 100-120V 220-240V or 390-410V, and mentioned below for 5 simplicity and by our convention, high voltage. The high voltage current from input 5 passes to a first stage 8 for filtering / protection / rectification. Subsequently, the current passes through a power factor 10 regulation stage 10 (called PFC = Power Factor Corrector). The next step is a transformer 12 which lowers the voltage, for example to 24-48V, and in fact acts as a separating element between two circuits 13 and 14, called for simplicity, respectively, high voltage and low voltage. The low voltage circuit 14 downstream of the transformer 12 supplies one or more loads 20, for example LEDs, managed by control devices 15 called "drivers". The LEDs 20 belong to a printed circuit 20 30 commonly called PCB. This type of power supply system has been used for many years, however, in the face of modern needs it appears to have various disadvantages. This system has in fact a low efficiency due to the high number of components, which inevitably - 2 Ing. Andrea Busca isc. Register n ° 1095 B have an efficiency and are therefore subject to energy losses. Furthermore, a large number of components is subject to a higher probability of failure, therefore it is less reliable. 5 The applicant further notes that, in the case of LEDs, or similar loads, placed in series with the transformer, there is an explicit limit to their number due to the low voltage of the circuit 14. The only solution currently possible to increase the number of the 10 applicable loads is to increase the number of transformers and / or drivers, and therefore to multiply the low voltage circuits. However, this increases the number of components and therefore further lowers efficiency and reliability, increasing management costs, as well as construction costs obviously. It is also noted that the known solution requires a lot of space, contrary to the ever increasing demand for miniaturization. Some patents or patent applications listed below are also known which however do not suggest specific solutions to the problems indicated above. From patent application US2007 / 0025108, for example, a flexible printed circuit board 25 with diode carrying a generic electrical insulation of the tracks is known. - 3 Ing. Andrea Busca isc. Register n ° 1095 B From patent US6362433 an insulated printed circuit with two or more layers of polyamide covering the tracks is known. From US2003 / 0044631 an elastomeric cushion 5 is known which is suitable for making the components which disperse heat better adhere, it does not specifically describe PCBs. From EP0322165 a thermally conductive adhesive material for connecting electrical components is known. 10 From US5394301 an elastic thermally insulating cushion is known fixed on one side of a PCB opposite to that of the loads, in order to better adhere to heat dissipation devices. From EP0393765 a circuit board with 15 cooling plate is known, in which a silicone layer is interposed between the board and the plate. From the literature document "Thermally Conductive Elastomer for cooling" IBM technical disclosure bulletin, vol. 28 n. 4, 1 sept 1985, page 20 1490, classified (XP-001450376) by the database of the European Patent Office, the application of a thermally conductive silicone layer between a PCB and a finned heat sink is known. general of the present invention is therefore to solve in whole or in part i - 4 Ing. Andrea Busca isc. Register No. 1095 B problems of the known art. A preferred object of the present invention is to provide an electrical and / or electronic device of greater efficiency. 5 Another preferred object of the present invention is to provide an electrical and / or electronic device with a smaller number of components. A further preferred object of the present invention is to provide an electrical and / or electronic device 10 which comprises a greater number of loads. Another further object of the present invention is to provide an electric and / or electronic device of high safety for people and of high reliability. According to a first general aspect, considered both associable and independent from other general aspects, the present invention relates to the electrical isolation of an electrical and / or electronic device. In particular, the invention refers to an electric and / or electronic device comprising - at least one source of electric current or at least one input for the electrical connection to at least one source of electric current, 25 - a printed circuit - 5 Ing. Andrea Busca isc. Register No. 1095 B characterized by the fact that it lacks a transformer device placed between the at least one source and the at least one printed circuit, and the printed circuit is at least partially electrically isolated. 5 The applicant has in fact understood that by moving the electrical isolation function of the loads from the transformer directly to the printed circuit itself, there are numerous advantages, including the reduction of components and the possibility of supplying a greater number of 10 loads thanks to the higher voltage available. Preferably the at least one printed circuit is powered substantially with the same voltage as the electrical source and / or the input for the electrical connection 15 to at least one source of electrical current. For example, it is possible to realize the device as a single circuit substantially at the same voltage. According to some preferred embodiments of the invention, the printed circuit is at least in part 20 electrically insulated by means of at least two electrically insulating portions, superimposed in the direction of its thickness, arranged to at least partially cover at least one external electrical contact track of the printed circuit, from the its side facing out. 25 It is generally observed that the at least two portions - 6 Ing. Andrea Busca isc. Register n ° 1095 B can at least be considered to have an electrically insulating effect for the purposes of the present invention if the wall formed by them is subjected, in the sense of their overlapping, to a ddp of 400V and is crossed by 5 a current lower than 30mA. experimentally found that the presence of at least two insulating portions offers a higher and therefore very safe level of electrical insulation. 10 According to a preferable general characteristic, the printed circuit comprises at least one side at least partially thermally conductive, intended to come into contact with a heat sink, where in correspondence with said contact side there is an elastically deformable and thermally conductive interface portion 15 for favor the adhesion of the printed circuit to the heat sink and the transfer of its heat to it. In this way it is also possible to advantageously manage 20 the thermal dissipation since the elastically deformable interface portion ensures greater adherence and therefore a greater surface for heat exchange with the dissipator. According to some particularly advantageous embodiments 25 of the device, the portion - 7 Ing. Andrea Busca isc. Register No. 1095 B of elastically deformable interface is also electrically insulating and coincides with one of at least two electrically insulating portions of the PCB overlapping each other in the direction of the thickness. 5 In this case, preferably said at least two electrically insulating portions are interposed between at least one electrical connection track of the printed circuit and the heat sink, where the most distal portion with respect to the tracks is elastically more deformable than the 10 most proximal portion and forms said interface portion . According to some preferred embodiments, the electric and / or electronic device is a lighting device comprising at least one heat sink 15 with cooling fins, and the printed circuit comprises a plurality of LEDs arranged in correspondence with a plurality of said fins. In particular, the LEDs are aligned with said fins so as to transmit to them the heat generated in a more direct manner. According to a second general aspect, considered both associable and independent from other general aspects, the invention concerns the electrical insulation of printed circuits. 25 In particular, the invention refers to a - 8 Ing. Andrea Busca isc. Register No. 1095 B substantially tablet-shaped printed circuit having two opposite main sides in the direction of the thickness of the tablet, the printed circuit comprising a plurality of electrical connection tracks 5, characterized in that at least one track, proceeding in the direction of the thickness and according to a direction that goes from the inside of the printed circuit towards an area external to one of the two main sides, it is not surmounted in said direction by any other track and is therefore called for simplicity "external track", characterized by the fact that said at least one outer race is at least partially electrically insulated from said outer zone by at least two electrically insulating portions superimposed on each other in said direction of the thickness. Advantageously, therefore, the printed circuit according to the present invention has at least one main side electrically insulated with respect to an external zone thereof by at least two electrically insulating layers 20. Preferably said at least two electrically insulating portions form an electrically insulating wall that entirely covers at least one of said two main sides, however it is not excluded that the electrically insulated area 25 may be less than a whole - 9 Ing. Andrea Busca isc. Register n ° 1095 B main side. In general, it is preferable that the electrically insulating portions are different layers of the same material or of different materials, or that they are 5 portions of the same layer of material each with physical and / or chemical and / or mechanical properties different from the other portion. According to a third general aspect, considered both associable and independent of other 10 general aspects, the invention concerns the thermal conductivity of printed circuits. In particular, the invention refers to a printed circuit characterized by the fact that it comprises at least a portion for transmitting heat to an external zone 15 of the circuit, said portion being made with a thermally conductive and elastically deformable material, placed to form an interface of the printed circuit with said outer zone. For example, said interface is the outermost portion 20 of a main side of the printed circuit. Advantageously, this printed circuit is able to transmit to the outside the heat it generates very effectively since the elastically deformable material is for example able to adhere to a heatsink, optimizing the contact and therefore the - 10 Ing. Andrea Busca isc. Register n ° 1095 B thermal transmission. It is reiterated that this third aspect can be associated with or independent of an electrical insulation aspect of the printed circuit. 5 If there is also an electrical insulation, it is preferable that the interface portion is also electrically insulating and / or placed at least on an electrically insulating portion. For example, the interface portion can coincide with one of the at least two 10 electrically insulating portions described with reference to the second aspect of the aforementioned invention. According to a fourth general aspect thereof, considered both associable and independent from other 15 general aspects, the present invention relates to the realization of the surface finish of printed circuits. In particular, it relates to a process for making a printed circuit comprising the steps of providing at least a rigid board of support 20 with at least two main external sides in the direction of the thickness of the board, on at least one of which a plurality of contact tracks is placed. electric, characterized in that at least one area with at least one track of said at least one main side is covered 25 with at least a first layer of leveling material - 11 Ing. Andrea Busca isc. Register No. 1095 B in such a way as to form a first substantially flat surface, subsequently on said substantially flat surface at least a second layer of material, equal to or different from said leveling material, is applied to form a second substantially flat surface. Further characteristics and advantages of the present invention will become clearer from the following detailed description of its preferred embodiments 10, made with reference to the attached drawings and given by way of non-limiting example. In these drawings: - figure 1 is a schematic representation of a known lighting device comprising LEDs 15 soldered on a known printed circuit; Figure 2 is a schematic representation of a lighting device according to the present invention; Figures 3a and 3b schematically show and 20 in perspective view respective main sides of a PCB; - figures 4a and 4b schematically show in perspective view the two main sides of a PCB according to the present invention; 25 - figures from 5 to 16 represent the phases of - 12 Ing. Andrea Busca isc. Register n ° 1095 B realization of the PCB of figure 4 through schematic sections; Figures 17 to 20 schematically represent alternative embodiments of 5 printed circuits according to the present invention; and - Figure 21 schematically represents a section view of a part of a lighting device according to the present invention. In the following, embodiments 10 and variants of the present invention will be described, where elements identical or similar to those illustrated in Figure 1 with reference to the known art will be indicated with the same reference number. In the following we will also use the abbreviation PCB in a generalized way to indicate any type of printed circuit. With reference to Figure 2, an electric and / or electronic device 101 is shown which differs from the device 1 of Figure 1 in that it does not include any transformer, so that it coincides with a single circuit 113 where all the parts are substantially located at the same voltage, substantially coinciding with the voltage of the power source 3 (where "substantially" means that 25 at least the passage in stages 8 must be taken into account - 13 Ing. Andrea Busca isc. Register n ° 1095 B and 10). Said voltage (or said voltage after passing through said stages) is preferably ≥ (greater than or equal to) 100V, more preferably ≥ 200V and even more preferably ≥ 350V. 5 The LEDs 20 in this case belong to at least one PCB 130 which differs from common PCBs 30 such as those of Figure 1 in that it is electrically insulated. Figures 3a and 3b show, according to perspective views from different angles, the known PCB 30 where 10 you can see the presence of two main sides 35 and 40, on one of which some LEDs 20 are soldered and on both of which there are tracks of electrical connection 45 suitable for carrying electric current. The tracks and the LEDs are supported by a rigid support tablet 15 32 In addition to this there are holes 47 for connection between the two sides 35 and 40. All this ensures that the PCB 30 is not electrically isolated and has external surfaces full of roughness . Figure 4 shows the PCB 130 of figure 2 in 20 which shows that the tracks 45 on the side opposite to that on which the LEDs 20 are soldered have been electrically insulated by means of two electrically insulating cover layers 50 and 60, which also level the various asperities making a flat outer surface 85. 25 The outermost electrically insulating layer 60 - 14 Ing. Andrea Busca isc. Register No. 1095 B is preferably more elastic than the innermost layer 50, which may not be at all. For example, it is possible to make the internal insulation layer 50 with an epoxy resin, and the external insulation layer 5 60 with a silicone resin. More details of the electrical insulation cover external to the tracks can be understood from the preferred method of manufacturing PCB 130 described below. 10 With reference to Figure 5, in a first step of this process a support board 32 is prepared, coated on both sides by respective layers of copper 70 and 72. The board 32 is made of electrically insulating material and is preferably 15 rigid. Some trade names of suitable materials are FR4 and CEM3. With reference to Figure 6, on at least one, preferably on both sides, a layer of photoreactive material 74 is deposited on the copper which is capable of polymerizing 20 when subjected to light. A photographic film 75 containing the tracks to be created is placed above the PCB and then illuminated (The arrows L in the figure indicate the application of light). With reference to Figure 7, the non-photoreactive material is removed by means of a chemical bath 25. Ing. Andrea Busca isc. Register n ° 1095 B polymerized. Subsequently, with a second chemical bath the copper remaining discovered is eliminated as shown in figure 8, then the residue of photo 5 reactive material 74 is eliminated, obtaining the bare copper tracks 45 as shown in figure 9. Figure 10 shows the tracks 45 on both sides of the PCB, which are obtained if the process is applied to both copper layers 70 and 72. 10 Figure 11 shows the making of the connection holes 47 between the two main sides of the PCB. In the step of Figure 12, the holes 47 are filled with copper to create electrical connections 48 between the tracks 45 of the two opposite sides. 15 With reference to Figure 13, the phase in which a protective layer 77 is arranged on the two sides can be seen, for example for antioxidant and compaction purposes. Generally this is the final stage of manufacturing the known PCBs 30. However, since 20 the protection layer 77 is generally thin and in any case provides substantially negligible electrical insulation, its application is for PCBs according to the optional invention, and the process continues with the following electrical insulation steps. 25 With reference to figure 14, on one of the two - 16 Ing. Andrea Busca isc. Register No. 1095 B main sides 140 of the PCB the layer of electrically insulating material 50 is applied so as to cover the asperities and form a first flat surface 80. The layer 50 is integral with the PCB and is deposited 5 for example by screen printing. According to some variants, it is not excluded that the protective layer 77 is made of electrically insulating material and deposited to form the layer 50 itself. With reference to Figure 15, the electrically insulating layer 60, more elastically deformable than the underlying layer 50, is applied to the flat surface 10 80. In this way it will be noted that the layers 50 and 60 form a main side 140 of the PCB 130 electrically insulated for its full extent. According to some possible variants, the extension of the isolated part of the side 140 could be smaller, for example being limited to one or more of its areas. The layer 60 also provides a flat surface 20 85 useful for providing an elastic contact interface with elements not belonging to the PCB. It is observed that the electrically insulating layers 50 and 60 are preferably thermally conductive, i.e. they are capable of transmitting heat. 25 As shown in figure 16, on side 135 of the PCB - 17 Ing. Andrea Busca isc. Register n ° 1095 B opposite to the electrically insulated side 140 the components are applied, for example by welding, which can be any type of load, such as for example the LEDs 20. At this point the PCB 130 is completed. 5 In the following, alternative embodiments and variants of the present invention will be described, where elements equal or similar to those illustrated up to now will be indicated with the same reference number or with the same number increased by 100 or a multiple of 10 thereof. Figure 17 shows a PCB 230 according to an alternative embodiment of the present invention, which differs from PCB 130 of Figure 16 in that the electrically insulated side 240 comprises a third electrically insulating layer 15 55. The layer 55 for example can be of the same material as the layer 50. According to some possible variants, the outermost elastic layer 60 may not be electrically insulating. In this case, according to some of these variants, it could however 20 be thermally conductive. Figure 18 shows a PCB 330 according to another alternative embodiment of the present invention, which differs from the previous ones in that it comprises multiple layers of copper 70, 72 and 73 and 25 support tablets 32 and 33. This causes that there are - 18 Ing. Andrea Busca isc. Register n ° 1095 B tracks 45 arranged on more than two levels with respect to the thickness. As it will be noted, proceeding in the direction S of the thickness and according to a direction that goes from the inside of the 5 PCB 330 towards the zone 341 external to the electrically insulated side 340, one encounters a layer of tracks 45e closer to said external zone 341, i.e. such therefore there are no other tracks interposed between them and this external area. for this reason the tracks 45e are called "external tracks". 10 The thickness of protective material 77 can optionally be placed on the outer tracks, but what matters for the purposes of the present invention is that they are surmounted by two electrically insulated layers 50 and 60. 15 It can be observed that the tracks 45 of the embodiments previously described and covered by the two electrically insulating layers 50 and 60 are to be considered "external", as they are not surmounted by other tracks proceeding from the inside of the PCB towards said insulating layers 20 50 and 60, but this description was previously omitted as deemed superfluous for the understanding of those cases. Figure 19 shows a PCB 430 according to another alternative embodiment of the present 25 invention, which differs from the previous ones by the fact - 19 Ing. Andrea Busca isc. Register No. 1095 B which comprises a single layer of copper 70 and therefore a single level of tracks 45 arranged on one side 435 of the tablet 32 on which the LEDs 20 are also arranged. Since the support tablet 32 is necessarily 5 in an electrically insulating material, to electrically insulate the tracks and loads on the electrically insulating side 440 according to the present invention it is sufficient to add on this side one of the two layers 50 or 60 to the board 32. These tracks 10 are also to be considered "external" in the sense previously said. Figure 20 shows a PCB 530 according to a further alternative embodiment of the present invention, which differs from the previous ones in that it does not comprise an electrically insulating double layer 15 on the side 540 opposite the LEDs 20 but only an elastically deformable layer 60 (according to some possible variants said layer may not even be electrically insulating). This embodiment can be used 20 for example when there are no particular electrical insulation requirements but an elastic interface 85 is desired for example to increase adhesion to another component. In the event that the elastically deformable layer 60 is thermally conductive, this can 25 facilitate the dissipation of heat from the PCB for - 20 Ing. Andrea Busca isc. Register No. 1095 B transmission to another body in contact with interface 80. With reference now to figure 21, the part of an electrical and / or electronic device 5 101 of figure 2 in which a PCB is applied is shown in greater detail 130. Said electrical and / or electronic device is a lighting device and comprises in addition to the PCB 130 also a heat sink device 90. The dissipator 10 90 has a series of cooling fins 91, and the LEDs 20 are arranged in alignment at least to some of said fins. The heat is transmitted by the LEDs to the fins thanks to the contact of the elastic and thermally conductive interface surface 85 with the bottom 15 86 of the heatsink 90. The heat in particular reaches this interface thanks to the fact that the electrically insulating layers 50 and 60 are thermally conductive . It is also observed that the electrical connections 48 between the various levels of tracks 45 can 20 themselves favor the passage of heat towards the electrically insulating layers 50 and 60. Although up to now only embodiments and variants with only one side of the Electrically insulated PCB, 25 forms of actuation with both main sides totally o are not excluded - 21 Ing. Andrea Busca isc. Register n ° 1095 B partially electrically insulated with at least two layers of electrically insulating material to cover at least partially said sides. In this case, the electrically insulating layers are preferably absent in correspondence with the LEDs and / or other loads. It is also possible to have LEDs and / or other loads on both main sides of the PCB. It is also observed that, although the presence of at least two layers of electrical insulation 10 has been described up to now, it is more appropriate to speak of portions of insulation, thus understanding both the case in which the portions are layers and that in which, in addition or alternatively, they are diversified zones of the same stratum. For example, the portions of a 15 same layer of material could in this sense have each physical and / or chemical and / or mechanical properties different from each other. In general, it is also observed that so far the only loads belonging to the PCB that have been described are the LEDs, however, in addition or as an alternative to them, any type of load can be used. Again in general it can be observed that although screen printing is today the preferred technology for 25 applying the electrically insulating portions to the PCB, in - 22 Ing. Andrea Busca isc. Register No. 1095 B as it guarantees that they remain integral and adherent over time, no other methodology is excluded, including the application in the form of adhesive tapes and / or gluing and / or casting and / or co-molding. Although 5 solutions are therefore preferred in which the insulation portions 50 and 60 adhere totally to each other (i.e. over their entire surface) permanently, it is not excluded that one or more of them are not integral with the PCB, even though they are considered part of it for the purposes of the invention. For example, the elastically deformable interface portion 60 could be an elastic mat resting on the electrically insulating leveling layer 50. Finally, it can be observed that although 15 insulations consisting of 2 or 3 layers or electrically insulating portions superimposed in the direction of the thickness have been described up to now , their number can be even greater. Naturally, the embodiments and the variants described and illustrated up to now are purely by way of example and a person skilled in the art, in order to meet specific and contingent needs, may make numerous modifications and variants, including for example the combination of said forms of implementation and variants, all however contained within the scope of 25 protection of the present invention as defined by - 23 Ing. Andrea Busca isc. Register n ° 1095 B following claims. - 24