Patent ID: 6477070
Filing Date: 2002-11-05
Classification: G01F

Abstract:
A current-regulator circuit of an electromagnetic flowmeter for generating a supply current for an excitation circuit having at least one excitation coil which in operation is traversed by an excitation current, said current-regulator circuit comprising:control electronics, to the input end of which an excitation current signal representative of the excitation current and a reference current signal representative of a reference value for the excitation current are applied, and which provides at the output end a pulse-width modulated first clock signal; and a setting electronics, including a storage choke, a smoothing capacitor, a first switch, and a second switch, wherein: said setting electronics being powered by a D.C. voltage and being controlled by the first clock signal, and said setting electronics setting a choke current flowing through the storage choke by means of the first switch and the second switch in such a way that the smoothing capacitor is traversed by an alternating-current component of the choke current, and the excitation circuit is traversed by a direct-current component of the choke current representing the supply current.