High quality Heavy Copper PCB

Definition of Heavy Copper PCB

Heavy Copper PCB (thick copper PCB) is defined as follows:

1. Thickness of copper layers:

- A Heavy Copper PCB, also known as a Thick Copper PCB, is a printed circuit board that has 3 ounces (oz) or more of copper layers in the inner and outer layers. Specifically, boards with copper thicknesses greater than 4 ounces per square foot (ft²) are also classified as Heavy Copper PCBs.Extreme copper layers mean 20 ounces to 200 ounces of copper per square foot.

2. Current Carrying Capacity:

- Heavy Copper PCBs are capable of supporting high currents, high temperatures, and repeated thermal cycling, which can be damaging to conventional circuit boards in a matter of seconds.

3. Thermal Performance:

- The use of more copper increases the current-carrying capacity of the board for heavy-duty circuits such as industrial electronics and automotive systems. It also enhances the thermal performance of the board.

4. Structure and Applications:

- Heavy Copper PCB technology makes it possible to combine complex layout structures in the outer layers with heavy copper layers in the inner layers.

5. Copper layer density:

- Heavy Copper PCBs have denser copper layers than conventional PCBs, typically with copper layer thicknesses ranging from 4 oz/ft² to 20 oz/ft² or more, based on actual application specifications.

6. Mechanical Properties:

- Heavy Copper PCBs also improve the mechanical properties of the PCB, allowing it to withstand more rigorous physical environments.

7. Thermal Management:

- Heavy Copper PCBs provide better heat dissipation if the application uses heavier copper PCBs in the current design. This is especially important for power electronics, especially when heat poses a major challenge to product durability.

8. Design Considerations:

- A key design factor for Heavy Copper PCBs is their copper thickness. These specialty boards can have copper layers from 4 oz/ft² to 20 oz/ft² or more. This extra copper helps the PCB deliver higher currents than its base material allows, but it also affects other design characteristics such as the width of the traces or the spacing between them.

To summarize, Heavy Copper PCBs are printed circuit boards with higher copper layer thicknesses that are capable of carrying higher currents, reducing resistive losses, improving circuit efficiency, and providing good thermal performance for use in high-power electronic devices and power supply systems.

In which application scenarios is Heavy Copper PCB more advantageous?

Heavy Copper PCB (Thick Copper PCB) has significant advantages in the following application scenarios:

1. LED Lighting:

- Heavy Copper PCBs play an important role in LED lighting power supplies and control circuits, especially in LED street lights and industrial lighting systems, where they can effectively manage the power supply and efficiently carry away heat to be emitted into the environment.

2. Industrial Electronics:

- The use of thick copper PCBs is common in industrial applications running high currents, such as heavy-duty circuits in automation equipment, large motor drives, and welding machines.

3. Renewable Energy:

- In renewable energy applications such as solar and wind energy converters, thick copper PCBs are responsible for managing the current from the power generation stage to conversion and distribution or use, and they are the backbone of transformer circuits, converters, battery charging systems and high-energy inverters.

4. Military and aerospace:

- Thick copper PCBs have a wide range of uses in military and aerospace systems, where they are used to operate spacecraft, weapons, and any power supply system for electronic systems that carry higher loads than standard circuits.

5. High Frequency Electronics:

- Thick copper PCBs play a pivotal role in the field of high-frequency electronics, and their low resistance and low inductance characteristics make them quite widely used in high-frequency electronics such as RF communication equipment, radar systems, and microwave equipment.

6. Automotive electronics:

- In the field of automotive electronics, especially in the engine control module, electric vehicle chargers and other key components, electronic equipment needs to withstand high temperatures, high currents and other extreme conditions, thick copper PCB with its excellent heat dissipation performance and high conductivity, just to meet these harsh conditions.

7. Power supply system:

- Power supply systems often use thick copper PCBs because they can handle high voltages and currents while also dissipating heat and ensuring good power distribution.

8. Industrial Machinery:

- Industrial machinery usually has high-power systems ranging from 220V to 35,000V, and these machines make extensive use of thick copper PCBs.

9. Heavy Vehicles:

- Heavy-duty vehicles such as electric buses, bullet trains, city streetcars and mining vehicles also use high-power components. In these applications, typical PCBs cannot handle such power, so thick copper PCBs are required.

10. Military equipment:

- In military equipment, thick copper PCBs provide solid circuit support for critical equipment such as weapon control, radar and surveillance systems due to their high reliability and corrosion resistance.

To summarize, thick copper PCB shows its unique advantages in application scenarios with high power, high current and high reliability requirements due to its high current carrying capacity, excellent thermal management performance, enhanced mechanical strength and design flexibility.

How to choose the right Heavy Copper PCBs

There are several key factors to consider when selecting the right Heavy Copper PCB (thick copper PCB):

1. Current carrying capacity:

- Heavy Copper PCBs are designed to carry higher currents. For example, a 3oz copper foil can carry approximately 12A of current, a 6oz copper foil can carry approximately 20A of current, and 10oz and above can carry even more current. Depending on your application needs, select the appropriate copper foil thickness to meet current capacity requirements.

2. Thermal Management:

- Thick copper PCBs help spread heat across multiple layers, preventing hot spots and keeping board temperatures low, which improves component performance and life.

3. Design Flexibility:

- Multilayer PCBs give you more workspace to place components on different layers, reduce board clutter, and add shielding to prevent electromagnetic interference (EMI).

4. Durability and Strength:

- The extra-thick copper layer of thick copper PCBs makes them stronger and able to withstand higher temperatures and mechanical stress for harsh environments where they may be exposed to high temperatures, vibration, or heavy loads.

5. Material type:

- Select a base material that is resistant to high temperatures, with a Tg higher than 130°C, such as high-performance FFR4, ceramics, metal cores and PTFE or polyimide.

6. Copper thickness and width:

- The amount of copper per square foot should match the level of current capacity required and the expected temperature rise. The designer should also ensure that there is adequate spacing; an alignment width calculator can help determine this value.

7. Layer Configuration:

- The coefficient of thermal expansion of the core material should not cause the alignment to crack due to uneven expansion. Proper symmetry is also necessary considering that prepreg resin flow may cause the inner layer to shift and cause alignment problems.

8. Electrical and thermal considerations:

- The design should include adequate thermal management techniques such as heat vias and plated through holes to improve conductivity and effectively manage heat in the stack.

9. Surface finish:

- Select appropriate surface finish options such as sprayed tin (lead-free), immersion gold, OSP, immersion silver, and immersion tin to ensure that the PCB's withstand voltage, insulation resistance, and maximum current density meet the requirements.

10. Reliability indicators:

- Consider reliability indicators such as solder heat resistance, peel strength, temperature resistance, through-hole reliability, etc. to ensure the stability of the PCB in special use environments.