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<blockquote data-quote="John Roberts" data-source="post: 16309" data-attributes="member: 126">Re: ElectromagnetsI&#039;m afraid you may be making a logical leap, in the wrong direction. The relationship between size and frequency for magnetics is related to different things and in the application we are most familiar with a different end target. In something like a switching supply we are trying to transfer power (current) from the primary to the secondary. This transfer only occurs at the very top and bottom of the waveform peaks (due to PS rectification), not during the entire waveform. The higher frequency carrier means we will have more peaks and bottoms to pass more &#039;&#039;small&#039;&#039; pushes of current per unit time, as compared to a conventional heavy iron transformer that only pushes larger pulses of current at 2x 50/60 Hz.&nbsp; The actual magnetic flux that exists inside the small HF transformer is smaller, than the large transformer as you should expect. If you are trying to get more magnetic flux or a stronger magnetic field you are barking up the wrong tree.. If trying to make a smaller power supply you are OK. JR</blockquote>

[QUOTE="John Roberts, post: 16309, member: 126"] Re: Electromagnets I'm afraid you may be making a logical leap, in the wrong direction. The relationship between size and frequency for magnetics is related to different things and in the application we are most familiar with a different end target. In something like a switching supply we are trying to transfer power (current) from the primary to the secondary. This transfer only occurs at the very top and bottom of the waveform peaks (due to PS rectification), not during the entire waveform. The higher frequency carrier means we will have more peaks and bottoms to pass more ''small'' pushes of current per unit time, as compared to a conventional heavy iron transformer that only pushes larger pulses of current at 2x 50/60 Hz. The actual magnetic flux that exists inside the small HF transformer is smaller, than the large transformer as you should expect. If you are trying to get more magnetic flux or a stronger magnetic field you are barking up the wrong tree.. If trying to make a smaller power supply you are OK. JR [/QUOTE]

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