Sensor based power switch control method and sensor based power switch method capable of fast turning on power switches
AssigneeMediatek Inc.
InventorsFan-Wei Liao, Tai-Ying Jiang, Chien-Sheng Chao, Bo-Yun Lin
Life of this patent
Estimating the term…
Abstract
A sensor based power switch control method includes setting a maximum inrush current, turning on at least one first power switches for charging a loading circuit from a high voltage terminal through the at least one first power switches, sensing a first charging current of the at least one first power switches being turned on by a first sensor, and turning on at least one second power switches for charging the loading circuit from the high voltage terminal through the at least one second power switches when the first charging current starts to drop.
Claims17
A sensor based power switch control method comprising:
- setting a maximum inrush current;
- turning on at least one first power switches for charging a loading circuit from a high voltage terminal through the at least one first power switches;
- sensing a first charging current of the at least one first power switches being turned on by a first sensor;
- turning on at least one second power switches for charging the loading circuit from the high voltage terminal through the at least one second power switches when the first charging current starts to drop;
- and
- sensing a second charging current from the high voltage terminal to the loading circuit by a second sensor;
- and
- turning on at least one additional power switch when the second charging current starts to drop.
A sensor based power switch control system comprising:
- a power control circuit;
- a first sensor coupled to the power control circuit;
- a second sensor;
- at least one first power switches coupled to the first sensor;
- and
- a loading circuit coupled to the at least one first power switches;
- wherein after the maximum inrush current is set, the at least one first power switches is turned on for charging a loading circuit from a high voltage terminal through the at least one first power switches, the first sensor senses a first charging current of the at least one first power switches being turned on, and when the first charging current starts to drop, at least one second power switches is turned on for charging the loading circuit from the high voltage terminal through the at least one second power switches;
- and
- wherein the second sensor senses a second charging current from the high voltage terminal to the loading circuit, and when the second charging current starts to drop, at least one additional power switch is turned on.
Dependencies are inferred from the claim text.