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 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]