TopFeatured.com

This is a theoretical post. Nothing has been made. This is also an uncertain post, which, is based on some myths, which, may or may not be true or may have an insignificant effect. However, some of the ideas may be used ( changed or not ) for Class D amplifiers.

Myths :

Because of lack of information, the proposed controller is made after some myths, made up by the author. Whether these myths are true or false is unknown.

Myths :

1. Continuous is better than discontinuous as far as the noise is concerned.

2. Gradual and slow switching of the primary is better than fast switching as far as the noise is concerned. Instead of the whole, suggested here, transformer, RC filters can be used before the transistor to allow slow switching.

3. Higher resistance ( Rce ) in series to a switching primary is better than low resistance as far as the noise is concerned.

4. Because noise can proliferate from the auxiliary and or primary coils through to the secondary coil ( s ), a controller, made with analogue, audio parts and without any component saturation is better than a controller, made with digital parts or non audio analogue parts or parts which can go in saturation as far as the noise is concerned.

The idea, therefore, is to make a flyback transformer controller with low noise, audio components, which, switches the control transistor of the transformer’s primary gradually and slowly within the period of the switching frequency of 50KHz to > 100KHz. The controller must perform a very gradual switch of the control transistor. This may or may not reduce the noise and may, even, increase the noise. Unknown.

Here is the document :

An Idea for a Controller for a Switched Flyback Transformer Power Supply – Google Drive

The schematics are in the addendum.