| 摘要 |
A power unit intended to supply an electric bulb, a battery charger, electronic equipment or the like includes a self-oscillating series-resistance converter. The converter includes two mutually connected transistors (TR1, TR2), each of which is activated by a control transformer (T1), and further includes an inductor (L1) and a capacitor (C4) connected in series. Each transistor (TR1, TR2) and a corresponding series-connected capacitive voltage divider (C6, C7) associated with the transistor and/or a further transistor (TR3, TR4) are connected parallel with the inductor (L1), capacitor (C4) and control transformer (T1). The load is activated or energized across the capacitor (C4). The magnetic flux through the control transformer (T1) is influenced by means of a magnetic flux applied externally through a magnetic or corresponding means, so as to change the oscillation frequency of the transistors (TR1, TR2) and therewith the voltage output of the power unit.
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