System and method for gradient amplifier control

摘要

A gradient amplifier for driving a gradient coil is disclosed. The gradient amplifier includes a direct current (DC) bus for receiving DC voltage generated from a series resonant converter, an inverter coupled to the DC bus configured to receive the DC voltage at the DC bus and convert the DC voltage to generate an output voltage to be applied to the gradient coil, and an inverter controller coupled to the inverter. The inverter controller is configured to generate control signals to control operation of the inverter based at least on a DC voltage feedback signal measured at the DC bus, an output voltage feedback signal measured at the output of the inverter, and a reference output voltage signal indicative of a desired voltage to be achieved at the output of the inverter.

主权项

1. A gradient amplifier for driving a gradient coil, the gradient amplifier comprising:
a direct current (DC) bus for receiving DC voltage provided from a series resonant converter; an inverter coupled to the DC bus configured to receive the DC voltage at the DC bus and convert the DC voltage to generate an output voltage to be applied to the gradient coil; and an inverter controller coupled to the inverter and configured to generate control signals to control operation of the inverter based at least on a DC voltage feedback signal measured at the DC bus, an output voltage feedback signal measured at the output of the inverter, and a reference output voltage signal indicative of a desired voltage to be achieved at the output of the inverter, the inverter controller comprising a compensation unit configured to receive the DC voltage feedback signal measured at the DC bus, wherein the compensation unit is further configured to provide a compensation signal according to the following equation:CF=UinUN,where Uin is the DC voltage feedback signal measured at the DC bus, UN is a nominal DC voltage signal indicative of a desired DC voltage to be supplied at the DC bus, and CF is the compensation signal.