Patent ID: 9740221
Date: 2017-08-22
CPC Classifications: G05F

Claim:
1. A method to reduce inrush current of electronic circuits having a Miller compensation capacitor connected to an output, the method comprising the steps of: (1) providing an electronic circuit having an input stage and a pre-charge circuit, wherein the pre-charge circuit is enabled during a start-up phase only, and a Miller compensation capacitor, which is connected between the input stage and directly to the output of the electronic circuit, wherein the output of the electronic circuit is connected to a capacitive load; (2) pre-charging by the pre-charge circuit a terminal of the Miller capacitor, which is connected to the input stage, to biasing conditions required for an operation as determined for the electronic circuit after the start-up phase at the very beginning of a start-up phase of the circuit while an internal current limit circuit of the electronic circuit has not yet started to operate; (3) clamping by the pre-charge circuit the terminal of the Miller capacitor, which is connected to the input stage to a voltage correspondent to normal biasing conditions, while the electronic circuit is starting up; and (4) disabling the pre-charging and clamping after a defined time span to ensure that the biasing of an input stage of the electronic circuit have reached final biasing conditions.