Capacitive sensing enabled switch mode power supply and data transfer

摘要

A microchip for control of a switch mode power supply (SMPS), with said microchip also having the ability to measure capacitance of an electrode or sense plate structure or structures, and use of a low power, power supply structure to supply said microchip, said power supply structure distinct from the main energy path via said SMPS to a load. The microchip may control said SMPS to transition between an active state and an inactive state, with the measured capacitance used to determine a condition for state transition. In said SMPS inactive state, only the microchip draws power to operate its capacitive sensing circuitry, leading to a significant SMPS standby losses decrease compared to prior art. Further teachings by the present invention include capacitive sensing based data transfer, universal charging platforms for mobile devices, noise immunity enhancements, various lighting embodiments as well as SMPS operation improvements.

主权项

1. A microchip for use in a switch mode power supply (SMPS) circuit, wherein said SMPS circuit is used to convert alternating current (AC) power to direct current (DC) power in order to energize a load, wherein said microchip is a controller for and connected to said SMPS circuit and characterised in that said microchip also comprises Charge Transfer (CT) measurement circuitry, and wherein said CT measurement circuitry is active and powered from the AC power through a secondary power supply circuit when the SMPS circuit is in an inactive state, and wherein measurements by said CT measurement circuitry are used to determine a condition for activation of said SMPS circuit.