Printed Circuit Boards for High-Current Applications

Printed Circuit Boards for High-Current Applications

Printed circuit boards, or PCBs, are crucial elements for industries that rely on high-current applications. These solutions, especially heavy copper PCBs, can withstand high currents as well as loads of mechanical stress.

Millennium Circuits Limited has a range of high-power PCB solutions to support your applications, whether you operate in the automotive or industrial equipment industries or with medical instruments or marine technology. With our innovative solutions and exceptional hands-on support services, we’re here to help grow your high-current operations.

Design Considerations for High-Power PCBs

Standards for high-voltage PCBs are stringent. But with the correct materials and design, a high-voltage PCB will be functional and safe. Here are a few things to consider for your high-power PCB design.

  • Airflow
  • Amount of power
  • Board material
  • Temperature
  • Vias

High power pcb designs

The amount of airflow around your circuit board is crucial, as it also relates to temperature and the possibility of overheating. The heat generated from the device’s circuit must dissipate into the cooler air around it. If the heat gets trapped, it can create a hot box and cause your PCB to overheat.

One of the most vital components in designing a high-power PCB is knowing the power path. Knowing the amount of power and its location will help you understand the integrated circuit’s position and the type and amount of dissipated heat required on the PCB. Power can affect many aspects of the circuit board design, such as board material, ambient temperature, airflow around the board and integrated circuit density.

Temperature is another crucial element in your PCB’s design. Because high temperatures can result in permanent damage or malfunctions in your board, you’ll want to understand common causes of high heat in PCBs, how to prevent it and how much heat a PCB can withstand. Common causes of high temperatures range from through-hole interference and high-frequency circuits to lead-free solder processes, surface-mount device distance and component malfunction.

You can prevent high temperature levels in your circuit boards by implementing solutions such as heat sinks, fans and laminates. Other ways include integrating heat pipes, increasing the PCB plate thickness or maintaining spacing. Your high-current PCB’s material will determine how much heat it can withstand. For example, a copper plate with optimal thermal components can resist high temperatures, while other materials are less reliable.

Vias help transfer heat and power from the electronic components to an exterior heat sink while also carrying higher currents through the PCB. Also called heat vias, these components are the connection between the board and the heat sink. Copper plating within vias reduces the design’s thermal resistance.

Challenges of High-Current PCBs

High-current printed circuit boards are impressive devices that can withstand many elements other boards can’t. However, they come with several challenges, such as:

  • Durability
  • Incorporating failsafes
  • Managing temperature

High-current PCBs must withstand heavier-than-average loads, which can be a challenge. Heavy copper used for these circuit boards is thicker compared to a PCB with more signals and lower power, which requires a rigorously controlled solder mask procedure. However, our team of experts has the knowledge and experience to complete the process to the highest standards.

To mitigate designs that may go awry, you can incorporate failsafe protection such as fuses or onboard thermal sensors. Failsafe fuses alleviate short circuits, while temperature sensors monitor hotspots and other crucial components. Temperature monitors help your PCB adjust to hotspots, making them a reliable way to monitor the board’s pulse.

failsafe fuses

Printed circuit boards can only handle a specific amount of heat, which depends on the materials used. If a PCB can withstand about 150 degrees Celsius, it meets the criteria for a high-temperature board. PCBs manufactured from materials with high heat resistance like Polyimide can sometimes withstand hotter temperatures, while those with less resistance can operate only at lower temperature levels.

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Common High-Current PCB Applications

PCBs with a heavy copper base can take on high current loads to support applications such as:

  • Automotive
  • Aviation
  • Heavy machinery
  • Power converters
  • Power supplies
  • Solar arrays
  • Transformers
  • Welding

If your project demands higher currents, a compact board design and a durable circuitry connection, heavy copper PCBs are beneficial. Even under high temperatures, these boards won’t disrupt or warp. Industrial equipment that uses high-current PCBs powers some of the most innovative technologies.

Many industries require PCBs to tolerate high voltage. However, some applications that don’t initially use high currents still need a PCB because of unfavorable conditions like low air pressure causing voltages to arc faster.

Because of advanced materials, the demand for PCB designs and circuit board manufacturing capabilities, PCB applications are rising. Today, they’re surpassing simple solutions and more industries are becoming part of the high-circuit PCB world.

Our Capabilities for High-Current PCB Applications

Thick copper traces from Millennium Circuits Limited allow for more thermal resistance and can handle higher current rates. Our solutions can also withstand higher temperatures for extended periods for stronger connection points. With a heavy copper PCB, you can opt for single- or double-sided solutions or ones with multiple layers.

The first two options are simple configuration design options, while the multilayer board is more complex. Multilayer PCBs can relay heavy current loads while simultaneously handling multiple functions. Copper traces like these support industries that require higher processes and performance levels.

Millennium Circuits Limited manufactures heavy copper PCBs with copper weight from 3 oz./ft² to 10 oz./ft². If you need more than 10 oz./ft², we can still support your requests.

Browse Our High-Quality PCBs Today

At Millennium Circuits Limited, our expertise in high-current PCBs will support your business success. We offer top-tier printed circuit board solutions at competitive prices. Our team of experts also delivers dedicated support services and works with you in understanding our innovative PCB solutions.

Reach out to a Millennium Circuits Limited representative if you have questions or browse our high-current printed circuit boards online.

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