Toroidal Transformers

Toroidal transformers are magnetic core transformers manufactured within a toroidal (ring or doughnut) shape. They are widely used in applications where stable and clean power supply is crucial. For example, small toroidal transformers can be found in medical devices such as MRI machines and ultrasound equipment.

Available in single, dual, or 5-lead output configurations, the structure of toroidal type transformers directly correlates to the number of input voltages they can accept. Toroidal transformers have primary and secondary windings due to the principle of electromagnetic induction. Most of our transformers have a secondary voltage around 12V, and primary voltages around 115V.

How Do Toroidal Transformers Work?

Transformers use the principles of induction to transfer energy in the form of electricity via their internal coil. They make it possible for devices with different power requirements to run off the same source of voltage. Toroidal transformers are able to adjust the voltage as needed. They can also increase and decrease current and alter electrical energy in other ways.

Toroidal transformers can be open or encapsulated. Some models are available with PCB mounting pins for secure attachment and connection to circuit boards.

Benefits of Toroidal Transformers

1. Transformers take up less space than their traditional square counterparts. Some manufacturers suggest that fitting a toroidal transformer with flying leads instead of terminal blocks can save you up to 60% of space.
2. These transformers are easy to mount, with some requiring just a single bolt to fix them in place.
3. They are available in a wide range of dimensions, offering flexibility in application.
4. Toroidal transformers offer great noise reduction and emit less EMI (electromagnetic interference) than standard transformers.
5. Toroidal transformers have a low stray field compared to traditional EI (laminated) transformers.
6. They are quieter to run than standard transformers and create less humming noise.
7. They present excellent value for money. Toroidal cores take less energy to maintain a magnetic field, and therefore use less power.

Types of Toroidal Transformers

Toroidal Power Transformer

These transformers efficiently transfer electrical power between circuits by inducing a current in a secondary winding when an alternating current flows through a primary winding, leveraging their compact, low-loss toroidal core for high efficiency.

Toroidal Isolation Transformer

Designed with physically separated primary and secondary windings, they transfer power via magnetic induction while preventing a direct electrical connection. This effectively reduces noise, voltage spikes, and provides crucial safety isolation between circuits.

Toroidal Instrument Transformer

These transformers scale down high currents or voltages for measurement purposes, providing a safe and accurate representation of the electrical parameters for instrumentation.

Toroidal Audio Transformer

Leveraging their low electromagnetic interference (EMI) and efficient magnetic coupling, they provide clean, stable power and minimise signal distortion in audio equipment, crucial for high-fidelity sound reproduction.

Toroidal Core Transformer

This is a general term for any transformer with a doughnut-shaped magnetic core. Primary and secondary windings are wound the transformer's core for efficient transfer of electrical energy through electromagnetic induction with minimal leakage flux.

Industrial Applications of Toroidal Transformers

Toroidal transformers are widely used in various industries due to their efficiency, compact size, and low electromagnetic interference.

Medical Equipment

Small toroidal transformers provide safe and reliable isolated power for MRI machines, CAT scanners, and patient monitoring systems, ensuring patient and operator safety by reducing leakage current.

Renewable Energy Systems

Toroidal transformers are integral to solar power inverters and wind turbine control systems, offering high efficiency and low losses to optimise energy conversion.

Audio Equipment

The low hum and superior noise suppression of small toroidal transformers enable high-fidelity audio amplifiers and professional sound systems to deliver cleaner and more accurate sound reproduction.

Test and Measurement Equipment

Used in precision instruments like oscilloscopes and power analysers, they provide stable and clean power, crucial for accurate and repeatable measurements.

Power Supplies

Due to their compactness and efficiency, small toroidal transformers are commonly found in power supplies for various electronic devices, including computers and industrial control systems.

Lighting Systems

They are employed in low-voltage lighting applications, such as LED lighting systems, to efficiently step down mains voltage, ensuring stable and reliable operation.

Industrial Control Systems

Toroidal transformers power various industrial automation equipment, including machine tool controls and robotics, offering reliable and stable voltage regulation in demanding environments.

How to Choose the Right Toroidal Transformer

When selecting a toroidal transformer, consider the following key factors to ensure you pick the right type of transformer.

1. Power rating (VA/kVA): Ensures the transformer can safely and efficiently supply the maximum power required by your application's load without overheating or failure.
2. Input and output voltage compatibility: Matching the transformer's input voltage to your available power source, and its output voltage to the specific requirements of your driven components or circuit is important for proper compatibility.
3. Core material: Transformers with stainless steel cores are well-suited for low frequency applications while those with ferrite cores perform better at higher frequencies.
4. Physical size: The transformer's dimensions must fit within the available space in your enclosure or product. Ensure enough space is set aside for mounting and heat dissipation.
5. Mounting requirements: Center-potted, surface-mounted, and through-hole mounted transformers all have different requirements for secure and stable installations.
6. Temperature certification: This ensures the transformer can operate reliably and safely within the expected ambient and operational temperature range of your application without degradation or safety hazards.

Supplier & Distributor of Toroidal Transformers in Australia

RS Australia is your go-to supplier and distributor of high-quality toroidal transformers, toroidal power supplies and toroidal step down transformers. Buy products from established industry leaders such as RS PRO, Nuvotem Talema and Block. We also have power supply and transformer peripherals such as DIN rail power supplies and switching power supplies on sale.

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