Title :
Stacked high/low voltage level H-bridge circuit for gradient amplifier of MRI system
Author :
Li, Siqi ; Cao, Bin ; Bi, Daqiang ; Jiang, Xiaohua
Author_Institution :
Dept. of Electr. Eng., Tsinghua Univ., Beijing
Abstract :
As an essential component in magnetic resonance imaging (MRI) systems, the gradient amplifier plays an important role for good image quality. A platform of stacked high and low level H-Bridge circuit is built to fit the high-dynamic and high-steady requirements of the gradient amplifier. Both high current slew rating and low steady ripple can be achieved by using the two H-Bridges, one with high voltage rating and the other with low voltage rating. Using a duel-DSP based controller, complex algorithms can be implemented. A feed forward control with low-pass filter is proposed, and its effect is validated by experimental results on the platform.
Keywords :
analogue processing circuits; bridge circuits; feedforward amplifiers; low-pass filters; magnetic resonance imaging; signal processing equipment; H-bridge circuit; MRI system; duel-DSP based controller; feed forward control; gradient amplifier; low-pass filter; magnetic resonance imaging; Bridge circuits; Circuit topology; Coils; Inductance; Low pass filters; Low voltage; Magnetic resonance imaging; Pulse width modulation; Sampling methods; Signal resolution;
Conference_Titel :
Electrical Machines and Systems, 2008. ICEMS 2008. International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-3826-6
Electronic_ISBN :
978-7-5062-9221-4
