This criteria mandates a very square loop magnetic material. The core should saturate in a very predictable and very abrupt manner. The core size and material must chosen to meet the following criteria: The 'blocking ability' of the MagAmp is determined by a control winding (and current) controlled by the amplifier structure at A1. Therefore by selectively blocking more or less of the secondary side voltage waveform, the output voltage can be controlled (regulated) independently from the primary feedback loop. This implies (see waveform e3) that only 3/4 of the volt-second product will be allowed to continue to the output. Note that waveform e2 shows the MagAmp as having blocked the first 1µS of the secondary voltage (e1). The MagAmp operates by blocking the leading edge of voltage pulses coming from the secondary side of the power transformer (see waveforms in Figure 1). An example circuit is detailed in Figure 1, with the MagAmp device labeled "SC." In this role, MagAmps can provide small, inexpensive control architectures that do not require the design of a dedicated regulator to control outputs other than the primary one. In this application, the core is used as a saturating device to regulate secondary (or tertiary, etc.) outputs in a switched mode power supply (SMPS). #Windings calculator for a magnetic amplifier softwareThe MagAmp Designer is a software program intended to assist design engineers in the selection of a Permalloy wound core for use as a magnetic amplifier (MagAmp).
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