Patent ID: 6781335
Filing Date: 2004-08-24
Classification: E04F,E06B,H02M,H02P

Abstract:
A drive assembly for a covering of an architectural opening, comprising a motor, an accumulator connected to the motor, a power source and an electrical circuit connecting the power source to the accumulator, characterized in that the electrical circuit comprises a step-up converter having a voltage converting circuit, wherein the voltage converting circuit comprisesan input terminal connected to the power source, wherein the power source is a varying voltage or current source; an output terminal with a supply voltage connected to the accumulator; an inductive element being with a first terminal connected to the input terminal and with a second terminal connected to a capacitive element and to the output terminal, the capacitive element being with one terminal connected to a reference voltage; a first switch being with a first terminal connected to the second terminal of the inductive element, and with a second terminal connected to the reference voltage, the first switch comprising a gate electrode for opening and closing of the switch when a control voltage of a first level is applied to the gate; and an oscillator comprising a power input connected to the output terminal, a start-up output connected to the gate electrode of the first switch for supplying a pulse-like signal to the gate electrode and an oscillator output.