Heavy Copper PCB or calls Power Supply PCB is manufactured with copper weights anywhere between 3-20oz/ft2, Copper weights above 20oz/ft2 are also possible and are referred to as extreme copper. the increased copper weight combined with a suitable substrate and thicker plating for the through holes transforms the once unreliable,weak PCB into a durable and reliable wiring platform. Now various power electronics products are being designed every days for a range of applications: such as Power line monitors, High power rectifiers, planar transformers, and power convertors,etc . |
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Heavy copper PCB used for High power and high current circuits and their control circuits were designed or produced separately on separate PCB. Heavy Copper PCB makes it possible to integrate high current circuits and control circuits to realize a highly dense, in a simple board structure,also the advantages include reduced layer count,low impedance power distribution,smaller footprints and potential cost savings.The features of Heavy Copper PCB can be seamlessly connected to normal PCB, The board incorporating Heavy Copper PCB are produced in the same way, albeit with specialized etching and plating techniques, such as high speed/step plating and heavy copper differential etching. |
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Panda PCB is capable of producing 12+ OZ of finished copper, we have a special treament for solder mask process,Only printing conductors firstly with solder resist in "Line-Mask" process, then E-spray with solder mask for the whole surface. Panda PCB utilizes a unique process referred to as “Laminated Deposition”. This combination of processes allows extreme copper thickness requirements to become very practical and cost effective. These processes use for heavy base copper that when placed in our plating and etching systems will guarantee the consistent and reliable high power circuits. |
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| Advanced techniques: |
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1. Heavy Copper Delamination
To achieve and keeping within the maximum final PCB thickness allowance while still laminate pressing with enough resin to fill all voids,we have rich experience to design the perfected stack-up and choose appropriate prepreg to meet dielectric thickness. our lamination machine use hot oil platens to ensure heat is applied uniformly across the entire production working panel. This helps to guarantee and even cure across the panel, which is key process to avoiding delamination problem . |
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2. Heavy Copper Etching
Since etching is a horizontal handle process, etching chemistry is sprayed on both of top and bottom sides. While the chemistry that is sprayed from the bottom falls back off the panel, the chemistry sprayed from the top side still remains on the panel, then forming a puddle. As a result, the bottom side is often over-etched. Because of the etch rate on the top side of the panel is reduced. This requires the operator to slow down the line speed in order to properly etch the top surface. |
| Heavy Copper PCB Advantages: |
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1, Increased endurance to PCB thermal strains.
2, Increased current carrying capacity for the circuits.
3, Increased PCB mechanical strength at connector sites or PTH holes.
4, Heavy copper PCB used to avoid all of potential circuit failure (i.e.,high temperature).
5, Reduced PCB size by incorporating multiple copper weights on the same layer .
6, Plated vias carry higher current through the PCB and help to transfer the heat.
7, PCB heatsinks directly plated onto the board surface using up to 10-20oz copper. |
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| Heavy Copper PCB Capability: |
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Applications: |
Copper thickness |
3OZ |
4OZ |
5OZ |
6OZ |
Inner Line width/space |
8/8mil |
9/9mil |
10/11mil |
12/12mil |
Outer Line width/space |
8/8mil |
9/9mil |
10/11mil |
12/12mil |
Registration |
+/-3mil |
+/-3mil |
+/-3mil |
+/-3mil |
Layer count |
22 Layer |
20 Layer |
18 Layer |
12 Layer |
Minimum hole size |
0.25mm |
0.25mm |
0.30mm |
0.35mm |
Max Board thickness |
6.0mm |
6.0mm |
6.0mm |
6.0mm |
Annular ring |
(4+2N)mil |
(4+2N)mil |
(4+2N)mil |
(4+2N)mil |
Material FR4 |
TG150 |
TG170 |
TG170 |
TG170 |
Aspect Ratio |
15:1 |
13:1 |
12:1 |
12:1 |
Plugging Vias Max |
0.6mm |
0.6mm |
0.6mm |
0.6mm |
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1, Solar power converters
2, Electric vehicle charging
3, Medical PCB
4, Traction converters for rail applications
5, Power line monitors
6, UPS systems
7, Protection relays
8, Industrial PCB
9, Nuclear power applications
10, Surge protectors
11, Excitation systems
12, Position control systems
13, Power grid switching systems
14, Automotive PCB
15, Power converters for railway systems |
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