Patent ID: 9608512
Date: 2017-03-28
CPC Classifications: H02M

Claim:
1. A control circuit for a step-up converter, comprising: a soft start module configured to control states of N transistor pairs of the step-up converter, where N is an integer greater than two; a driver module in communication with the soft start module and configured to generate a first signal when N transistor pairs of the step-up converter are ready to switch; a first charging circuit configured to charge (N−1) capacitors of the step-up converter to an input voltage of the step-up converter in response to the first signal and to generate a second signal when charging is complete; and a second charging circuit configured to sequentially charge the (N−1) capacitors of the step-up converter to (N−1) predetermined voltage values in response to the first signal and the second signal and before operation of the step-up converter begins.