70VA Toroidal Transformer, 110V AC to 12V/35-0-35V

ATO 1 phase 70VA toroidal transformer, a single primary winding tapped at 220VAC 50/60Hz and 30-0-35 volt dual secondary windings, 12V output is available, it has been widely used in household appliances and other electronic equipment with high technical requirements.

Advantages of ATO Toroidal Transformer

1. High Efficiency: Winding matches the core perfectly, which makes the transformer more efficient.
2. Long Service Life: With high-quality materials and manufacturing technology, the transformer can be used for 30 years.
3. Less Noise: The core is seamlessly rolled and the winding is set evenly over it, which makes the transformer quiet when it is working.
4. Less Radiation: Toroidal structure and winding technology reduce electromagnetic radiation.
5. Low Temperature Rise: Even if it is overloaded at 120%, the temperature rise will be less than 70℃.

70VA Toroidal Transformer Specifications

Toroidal Transformer Accessories

Toroidal Transformer Mounting Methods

Toroidal Transformer Internal Structure

Tips: Working Principle of toroidal transformer

When U1, a sinusoidal alternating voltage, is added to both ends of the primary coil, there is alternating current I1 in the conductor, and alternating flux ф1 is generated, which passes through the primary coil and the secondary coil along the core to form a closed magnetic circuit. In the secondary coil, mutual inductance potential U2 is induced, and a self-inductance potential E1 is also induced by ф1 in the primary coil, which has the opposite direction and similar amplitude to that of the applied voltage U1, thereby limiting the size of I1. In order to maintain the existence of flux ф1, a certain amount of power consumption is necessary, and the transformer itself also has a certain loss. At this time, although the secondary coil is not connected to load, there is still a certain current in the primary coil, which is called "no-load current".

If the secondary coil is connected with load, the current I2 is generated in the secondary coil, and the flux ф2 is generated consequently, which is opposite to flux ф1 in the direction, playing a counteracting role, so that the total magnetic flux in the core is reduced, thus reducing the primary self-inductance voltage E1. As a result, the current I1 increases, which shows that the primary current is closely related to the secondary load. When the secondary load current increases, I1 and ф1 increase, and the increase of ф1 supplements the flux counteracted by flux ф2 to maintain the total flux in the core unchanged. If the loss of the transformer is not taken into account, it can be considered that the power consumed by the secondary load of an ideal transformer is the power obtained from the power supply initially.