| 摘要 |
The invention relates to a method for generating a regulated direct voltage (UG) form an alternating voltage (Uw) using a step-down transformer (S1, D1, D2, C0, L), a step-up transformer (S2, D2, C0, L), an inductance coil (L) and a control device (11) that controls the transformer in a step-down or step-up transformation mode. According to the invention, an inductance coil voltage measuring signal (I) is compared with three limiting values (A, B, C) with the purpose of simplifying said method, wherein A corresponds to zero, B lies between A and C and B and C correspond to the direct voltage (UG). Switching from the step-down to the step-up transformation mode is effected when the increasing voltage measuring signal (I) drops after reaching B and A is not reached again and increases to C instead. Switching from step-down to step-up transformation mode is effected when the decreasing voltage measuring signal (I) increases after reaching A and B is not reached and drops to A instead. In the power supply device for implementing the method, the control device (11) comprises three comparators (15, 16, 17) for comparing the limiting values (A, B, C) with the voltage measuring signal (I) of a voltage measuring device (5), wherein at least B and C are dependent upon regulation deviation (Xw).
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