| 摘要 |
The invention relates to a drive assembly (45, 46, 52) for a covering of an architectual opening, comprising a motor drive (52), an accumulator (54) connected to the motor drive, a power source (45) and an electrical circuit (55) connecti ng the power source to the accumulator. The electrical circuit comprises a step-up converter. Preferably, the step-up converter comprises an input terminal (11) connected to the power source (45), and an output terminal (12) with a supply voltage, connected to the accumulator (54), the voltage converting circuit (2) having: - an input terminal (11) for connection to a varying voltage or current source, and an output terminal (12) with a suppler voltage, an inductive element (5) being with a first terminal connected to the input terminal and with a second terminal to a capacitive element (8) and to the output terminal (12), the capacitive element (8) bring with one terminal connected to a reference voltage (9), - a first switch (6) being with a fast terminal connected to the second terminal of the inductive element (5), said with a second terminal to the reference voltage (9), the first switch (6) comprising a gate electrode (31) for opening and closing of the switch when a control voltage of a first level is applied to the gate, - an oscillator (13) comprising a power input (14) connected to the output terminal (12), a start-up output (15) connected to the gate electrode (31) of the fir st switch (6) for supplying a pulse-like signal to the gate electrode (31)and an oscillato r output (16).
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