What Is a Magnetic Amplifier?

Magnetic amplifiers are electrical appliances made of a ferromagnetic material with non-linear characteristics and magnetized with DC and AC currents to convert electricity.

The magnetic amplifier enables precise control of the switching power supply, thereby improving its stability.
Magnetic amplifier core can be used
Amorphous, nanocrystalline
Magnetic amplifier
The ratio of the output current of the magnetic amplifier to the input current is called the current amplification factor of the magnetic amplifier.
The ratio of the output load power to the input control power is called the power amplification factor of the magnetic amplifier.
The output current and input current of a simple magnetic amplifier
Modern magnetic amplification
The magnetic amplifier is like other magnetic components.
The function of the magnetic amplifier can be described as a high-speed switch similar to a switching transistor. A rectangular BH loop is related to two working states, as long as the choke coil is subject to
BH loop
The magnetic switch is turned off, and the current cannot be output. Once the magnetic core material reaches the saturation switch, it is turned on, and the current starts to output. This result is based on the choke coil's impedance | Z | An order of magnitude rapid change. [2]
The current lags 90 degrees
When the applied voltage is u (t) = Umsinwt, the magnetic induction intensity in the magnetic core will change according to B =-(Um / wNAe) cosùt.
Choke
When t = 0, the magnetic induction intensity in the magnetic core is at a negative maximum value, the magnetic flux change rate is zero, and the current will jump from -imax corresponding to -Hc to imax corresponding to Hc, after which the current value remains unchanged.
When the magnetic induction intensity in the t = pi / w core is at a positive maximum value, the magnetic flux change rate is zero, and the current will jump from imax corresponding to Hc to -imax corresponding to -Hc, after which the current value remains unchanged.
The voltage and current of the magnetic amplifier saturation reactor are in the same phase relationship, so it is essentially an energy consuming element while the general reactor is a reactive element with a current lag of 90 degrees. [1]

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