Patent ID: 9335771
Filing Date: 2016-05-10
CPC Classification: G05F,H02M

Claim Text:
1. A feedforward control method, comprising: determining whether an input voltage rapidly changes or slowly changes, according to a difference between an input voltage reference value and an input voltage measurement value acquired by a high-speed low-precision analog-to-digital converter by means of periodic sampling; determining, from an information table, a first feedforward gain coefficient corresponding to the difference between the input voltage reference value and a first input voltage measurement value acquired by the high-speed low-precision analog-to-digital converter in a current sampling period when it is determined that the input voltage rapidly changes; determining a second feedforward gain coefficient corresponding to a ratio of the input voltage reference value to a second input voltage measurement value acquired by a low-speed high-precision analog-to-digital converter in the current sampling period when it is determined that the input voltage slowly changes; using the first feedforward gain coefficient or the second feedforward gain coefficient as a feedforward gain coefficient of a current input voltage; multiplying the feedforward gain coefficient of the current input voltage by an output value of a feedback loop of an output voltage to acquire a multiplication result; and converting the multiplication result to a control signal to control stable output of the output voltage.