Abstract
In switch-mode power converters with large ratings, it is important to be able to predict the parasitic resistances associated with circuit elements such as electrolytic capacitor and filter inductor in the initial converter design stage itself to avoid the cost and time associated with actual design, prototype fabrication, and testing of these components. Knowing the values of parasitic elements is also important as they decide the possibility of closed-loop instability, besides affecting the other circuit parameters. In this paper, a way to estimate the equivalent series resistance of electrolytic capacitor and the winding resistance of filter inductor is proposed leading to their closed form expressions in terms of system parameters. Using these, procedure to predict the closed-loop instability induced due to the input filter is exemplified with illustrative calculations.
Highlights
In particle accelerators, various magnets are used to bend, focus, and steer the beam of high energy charged particles such that the particles are maintained on the desired path and in the desired orbit [1]
Since the strength and quality of the magnetic field produced by the electromagnet depend on the current passing through it, the output current stability of the magnet power supply is required to be of the order of 10 to 1000 parts per million
50 μH 10 μF 2Ω 20 μF 0.2 Ω Variable depending on actual magnet load, 2.6 mH in the test setup on the architecture shown in Figure 1 has parameters listed in Table 1 which have been used to study the effect of these closed-loop oscillations induced by input filter in this paper
Summary
Various magnets are used to bend, focus, and steer the beam of high energy charged particles such that the particles are maintained on the desired path and in the desired orbit [1]. Transistor (IGBT) is used as the switching device Another filter in the output consisting of inductance L and capacitance C attenuates the switching frequency ripple produced by the chopper stage. The converter is sometimes tested with equivalent inductive load or even with the resistive load as the actual magnet and the power supply are developed almost simultaneously. 50 μH 10 μF 2Ω 20 μF 0.2 Ω Variable depending on actual magnet load, 2.6 mH in the test setup on the architecture shown in Figure 1 has parameters listed in Table 1 which have been used to study the effect of these closed-loop oscillations induced by input filter in this paper
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