ODM Heavy Copper PCB for Power Converters - High Current Capacity, Excellent Heat Dissipation | China Suppliers & Factory Manufacturers, Factories
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ODM Heavy Copper PCB for Power Converters - High Current Capacity, Excellent Heat Dissipation | China Suppliers & Factory Manufacturers, Factories

ODM Heavy Copper PCB for Power Converters - High Current Capacity, Excellent Heat Dissipation | China Suppliers & Factory Manufacturers, Factories

Boost your energy efficiency with our high-quality power converters, including AC-DC and DC-DC models, produced in China. Our renowned factory is dedicated to providing reliable solutions with strong current-carrying capacity and exceptional heat dissipation. As leading suppliers in the industry, we focus on innovation and safety, ensuring that our products meet all your power conversion needs. Experience the difference with our expertly manufactured converters designed for durability and performance
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Product Description

What is Heavy Copper PCB?

▶ The core is used in high-current and high-power scenarios (such as power supplies, new energy, industrial control, etc.). The key points of its design, manufacturing and application are as follows:

Core Features & Application Scenarios

★ Core Advantages
  • Strong current-carrying capacity: The current-carrying capacity of 70μm copper foil (2 oz) is approximately twice that of 35μm copper foil (1 oz) under the same line width.
  • Good heat dissipation: The thick copper layer can quickly conduct heat, reducing the risk of overheating of the device.
  • High mechanical strength: Thick copper enhances the PCB's resistance to bending and impact.
✦ Typical Applications
  • Power converters (AC-DC / DC-DC)
  • BMS for new energy vehicles
  • Industrial frequency converters
  • Control boards for welding machines
Heavy Copper PCB

Key Design Points

1 Selection of Copper Foil Thickness

Common specifications: 70μm (2 oz), 105μm (3 oz), 140μm (4 oz), up to 420μm (12 oz) in extreme scenarios.

Matching scenarios:
• Large current (≥5A): prefer 2–4 oz copper.
• Ultra-power (≥20A): select 6–12 oz copper.

2 Trace & Current-Carrying Capacity Design

Current-carrying calculation: Combine copper thickness, line width, and temperature rise (typically designed for ΔT = 10℃).

Formula: I = K × W × T0.83

Example: 2 oz (70μm), wire width 5mm → ~15A capacity at ΔT 10℃.

Trace optimization: Keep high-current traces as short and wide as possible; avoid narrow necks. Multi-layer boards can use parallel copper foil layers (2× 2 oz = 4 oz equivalent).

3 Via & Pad Design

Vias: Increase hole diameter (≥0.5mm); increase via count (~1A per hole); copper plating thickness ≥20μm on hole wall.

Pads: Enlarge pad size by 0.2–0.5mm vs. standard pads to prevent false soldering caused by rapid heat dissipation during welding.

4 Heat Dissipation & Insulation Design

Heat dissipation: Design thick copper area as a "copper sheet heat sink"; add metallized via arrays (via spacing ≤1mm) to connect to the heat dissipation layer.

Insulation: Widen wire spacing for thick copper layers (for 70μm copper, spacing ≥0.2mm) to prevent creepage breakdown under high voltage.

Manufacturing Process Difficulties & Control

▶ 1. Copper Foil Lamination & Etching

Thick copper lamination: High-temperature and high-pressure lamination (180℃ / 4MPa) is required to ensure peel strength between copper foil and substrate (≥1.2N/mm).

Thick copper etching: The etching rate is slow (~1μm/min). Etching time must be controlled to avoid side etching (side etching ≤0.05mm). A stepwise etching process should be adopted to reduce line width deviation.

▶ 2. Lamination & Warpage Control

The coefficient of thermal expansion (CTE) of thick copper layers differs significantly from the substrate. A symmetrical structure (consistent copper thickness between upper and lower layers) should be adopted during lamination, and a rigid support layer should be added to prevent PCB warping (warping degree ≤0.5%).

▶ 3. Surface Treatment

The surface of thick copper is prone to oxidation. It is preferred to choose tin plating (high-temperature tin layer) or nickel-gold plating to avoid OSP (incomplete organic film coverage).

The pad area needs to be enlarged with a "solder mask opening window" to ensure sufficient bonding force between the solder and thick copper.

Core Summary

💡 The core of heavy copper PCBs is "high current-carrying capacity + heat dissipation". In terms of design, it is necessary to match copper thickness with current-carrying capacity requirements. In manufacturing, challenges such as thick copper etching and lamination warping must be addressed. Heavy copper PCBs are ideal for high-power and high-current industrial and energy scenarios.

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Frequently Asked Questions (FAQ)

Q What is considered "heavy copper" in PCB manufacturing?
Heavy copper PCBs are generally defined as boards with copper thickness of 3 oz (105μm) or more per layer. Standard PCBs typically use 1 oz (35μm) copper. Heavy copper can range from 2 oz up to 12 oz (420μm) or even higher in extreme applications, providing significantly greater current-carrying capacity and mechanical strength.
Q What are the main advantages of using heavy copper PCBs over standard PCBs?
Heavy copper PCBs offer three key advantages over standard boards: (1) Higher current-carrying capacity — a 2 oz copper layer carries approximately twice the current of a 1 oz layer at the same line width; (2) Superior heat dissipation — the thicker copper conducts heat away from components more efficiently, reducing thermal stress; and (3) Greater mechanical durability — thick copper layers improve resistance to bending, vibration, and physical impact.
Q What industries and applications commonly use heavy copper PCBs?
Heavy copper PCBs are widely used in high-power, high-current industrial applications, including: AC-DC and DC-DC power converters, battery management systems (BMS) for electric vehicles, industrial frequency converters and motor drives, welding machine control boards, solar inverters, and UPS (uninterruptible power supply) systems. Any application requiring sustained high current (≥5A) and reliable thermal management is a strong candidate for heavy copper PCB design.
Q How do I calculate the current-carrying capacity for a heavy copper PCB trace?
The current-carrying capacity of a heavy copper trace can be estimated using the formula: I = K × W × T0.83, where I is the current (amperes), K is a coefficient based on allowable temperature rise, W is the trace width (mm), and T is the copper thickness (μm). For example, a 2 oz (70μm) copper trace with a 5mm width can carry approximately 15A with a 10℃ temperature rise. Always design with adequate trace width and minimize length to reduce resistance and heat generation.
Q What are the main manufacturing challenges for heavy copper PCBs?
The primary manufacturing challenges include: (1) Etching control — thick copper etches slowly (~1μm/min) and is prone to side etching, requiring stepwise etching to maintain precise line widths; (2) Lamination warpage — the difference in CTE between thick copper and the substrate can cause board warping; a symmetrical copper structure and rigid support layer are essential to keep warpage ≤0.5%; and (3) Surface treatment — thick copper surfaces oxidize easily, making tin plating or nickel-gold plating preferred over OSP for reliable surface finish.
Q How should vias and pads be designed differently for heavy copper PCBs?
For heavy copper PCBs, via and pad design requires special attention: Vias should have a larger hole diameter (≥0.5mm), use multiple vias in parallel (approximately 1A per via), and the copper plating on via walls should be ≥20μm (compared to 8–12μm for standard PCBs). Pads should be enlarged by 0.2–0.5mm beyond standard dimensions to compensate for the faster heat dissipation of thick copper during soldering, which can otherwise cause insufficient solder bonding and false solder joints.

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