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US 6,150,821 AGranted
Gradient magnetic field electronic power supply for gradient coil
AssigneeKabushiki Kaisha Toshiba
InventorsKiyomi Mori, Shigehide Kuhara
Life of this patent
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Abstract
A gradient magnetic field power supply includes an amplifier for supplying current to a gradient coil. Between input and output of the amplifier is connected a feedback circuit which feeds a portion of an output current at the output back to the input and has a built-in phase compensating circuit for compensating the phase of the feedback current. The frequency response of the phase compensating circuit is made variable and adjusted to fit variations in the load impedance of the amplifier with time. This ensures optimum phase compensation.
Claims8
A gradient magnetic field power supply for gradient coil comprising:
- amplifier means for supplying a current to said gradient coil;
- a capacitor;
- and
- current raising means for causing said current to rise by switching between first and second states, said first state being such that said capacitor is inserted between said gradient coil and said amplifier means and said gradient coil and said capacitor forms a series resonant circuit and said second state being such that said capacitor is removed from between said gradient coil and said amplifier means and said gradient coil and said amplifier means are directly connected to each other.
1 more element
Dependencies are inferred from the claim text.