Patent ID: 7291939
Filing Date: 2007-11-06
Classification: H03K

Abstract:
1. A touch controlled switch apparatus having a two wire interface, comprising: a high voltage terminal coupled to a source of high voltage; a low voltage terminal coupled to a source of low voltage; an output switch having a first terminal coupled to said high voltage terminal and a second terminal coupled to said low voltage terminal; a first diode having a first terminal coupled to said high voltage terminal; a first capacitor having a first terminal coupled to said low voltage terminal and a second terminal coupled to a second terminal of said first diode; a touch sensor comprising at least one sensing electrode and a control circuit coupled to said at least one sensing electrode, said control circuit having an input coupled to the junction of said first diode and said first capacitor, said control circuit further having a control output coupled to a control input terminal of said output switch; a voltage regulator having a power input coupled to said second terminal of said first diode and said second terminal of said first capacitor and a power outout coupled to said control circuit; and an enablement circuit adapted to selectively enable and disable said output switch according to a predetermined criterion.