Patent ID: 8797771
Filing Date: 2014-08-05
Classification: H02M

Abstract:
1. A timing controlled capacitor based AC-DC step-up converter configured to supply regulated output voltages to a load circuit comprising: a time varying input signal source providing a time varying input signal having positive and negative peaks; a first input capacitor having first and second terminals, the first terminal being coupled to the input signal source, the second terminal being coupled to a converter first positive output through a first rectifier, the second terminal further being switchably coupled to a converter ground through a first switch and to a converter second positive output through a second switch; a first switch controller coupled to said first switch for controlling the time at which the first switch is closed and the duration of such switch closure, wherein said first switch controller comprises a first integrator configured to integrate the difference between a function of the converter first positive output and a predetermined first reference voltage to provide thereby a first control signal and wherein the first switch controller causes the first switch to close when the voltage at the first input capacitor second terminal falls below ground level and further causes the first switch to open when the voltage at the first input capacitor second terminal falls below the value of the first control signal; and a second switch controller coupled to said second switch for controlling the time at which the second switch is closed and the duration of such switch closure, wherein said second switch controller comprises a second integrator configured to integrate the difference between a function of the converter second positive output and a predetermined second reference voltage to provide thereby a second control signal and wherein the second switch controller causes the second switch to close when the voltage at the first input capacitor second terminal rises above the converter second positive output and further causes the second switch to open when a function of the voltage at the first input capacitor second terminal rises above the value of the second control signal.