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HIP2030栅极驱动器用于控制电源器件的应用介绍
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2009-05-30
王涛
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Transformer coupling of low level voltages to control power
devices has three main advantages: DC isolation, secondary
voltages step up or step down ability, and variable output
impedance. The conventional transformer switching methods
are limited to AC signals; since the flux, in an ungappedcore,
needs resetting every half cycle of the pulse period to prevent
core saturation. Also, the primary of the transformer must maintain
volt-second balance; meaning that the primary voltage
times the seconds applied must equal negative primary voltage
times the seconds applied. If the time of the reset pulse is short
with respect to the on time pulse, for the same input voltage, a
larger primary voltage will couple into the secondary.
devices has three main advantages: DC isolation, secondary
voltages step up or step down ability, and variable output
impedance. The conventional transformer switching methods
are limited to AC signals; since the flux, in an ungappedcore,
needs resetting every half cycle of the pulse period to prevent
core saturation. Also, the primary of the transformer must maintain
volt-second balance; meaning that the primary voltage
times the seconds applied must equal negative primary voltage
times the seconds applied. If the time of the reset pulse is short
with respect to the on time pulse, for the same input voltage, a
larger primary voltage will couple into the secondary.
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