Method and power supply device for generating regulated D.C. voltage from A.C. voltage
First Claim
1. Method for generating a regulated D.C. voltage (UG) from an A.C. voltage (Uw) by means of a power supply device, comprising a step-down converter (S1, D1, D2, C0, L) with a first switch (S1), a step-up converter (S2, D2, C0, L) with a second switch (S2), an inductor (L), which is common for both converters, and a control device (11), which sequentially controls the step-down converter and the step-up converter in such a way, that the power supply device is operated in either a step-down conversion mode or a step-up conversion mode, whereina measured current signal (I) of the current (IL) flowing through the inductor (L) is compared with a first limit value (A), a second limit value (B) and a third limit value (C), the first limit value (A) being close to zero and the second limit value (B) ranging between the first limit value (A) and the third limit value (C), and at least the second and the third limit values (B, C) being inversely proportional to the actual value (X) of a physical magnitude corresponding to the D.C. voltage (UG), the control device (11) switches the power supply device from the step-up conversion mode to the step-down conversion mode, when, after reaching the second limit value (B), the rising measured current signal (I) starts decreasing, though not reaching the first limit value (A), but rises (t4) to the third limit value (C), and the control device (11) of the power supply device switches from the step-down conversion mode to the step-up conversion mode, when the decreasing measured current signal, after reaching the first limit value (A), starts rising and does not reach the second limit value (B), but decreases back (t6) to the first limit value (A).
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Abstract
A method and power supply device for generating a regulated direct voltage from an alternating voltage using a step-down transformer, a step-up transformer, an inductance coil and a control device that controls the transformer in a step-down or step-up transformation mode is disclosed herein. An inductance coil voltage measuring signal is compared with three limiting values (A, B, C), wherein A corresponds to zero, B lies between A and C and B and C correspond to the direct voltage. Switching from the step-down to the step-up transformation mode is effected when the increasing voltage measuring signal 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 increases after reaching A and B is not reached and drops to A instead. In the power supply device, the control device includes three comparators for comparing the limiting values (A, B, C) with the voltage measuring signal of a voltage measuring device, wherein at least B anc C are dependent upon regulation deviation.
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Citations
7 Claims
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1. Method for generating a regulated D.C. voltage (UG) from an A.C. voltage (Uw) by means of a power supply device, comprising a step-down converter (S1, D1, D2, C0, L) with a first switch (S1), a step-up converter (S2, D2, C0, L) with a second switch (S2), an inductor (L), which is common for both converters, and a control device (11), which sequentially controls the step-down converter and the step-up converter in such a way, that the power supply device is operated in either a step-down conversion mode or a step-up conversion mode, wherein
a measured current signal (I) of the current (IL) flowing through the inductor (L) is compared with a first limit value (A), a second limit value (B) and a third limit value (C), the first limit value (A) being close to zero and the second limit value (B) ranging between the first limit value (A) and the third limit value (C), and at least the second and the third limit values (B, C) being inversely proportional to the actual value (X) of a physical magnitude corresponding to the D.C. voltage (UG), the control device (11) switches the power supply device from the step-up conversion mode to the step-down conversion mode, when, after reaching the second limit value (B), the rising measured current signal (I) starts decreasing, though not reaching the first limit value (A), but rises (t4) to the third limit value (C), and the control device (11) of the power supply device switches from the step-down conversion mode to the step-up conversion mode, when the decreasing measured current signal, after reaching the first limit value (A), starts rising and does not reach the second limit value (B), but decreases back (t6) to the first limit value (A).
Specification