Method for controlling the current intensity of the electric current flowing through an inductive consumer and a corresponding circuit configuration

US9438097B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dieter Schwarzmann · Heilbronn, DE
• Marco Martini · Trecastagni, IT
• Christian Klein · Portland, US
• Thomas Wieja · Eningen unter Achalm, DE
• Bernd Mueller · Leonberg, DE
• Uwe Guenther · Nufringen, DE
• Alexander Herrmann · Reutlingen, DE
• Steffen Reinhardt · Pforzheim, DE
• Beate Leibbrand · Rochlitz, DE
• Christian Lammers · Stuttgart, DE

Key dates

• Filing date: Jul 31, 2013
• Grant date: Sep 6, 2016
• Expiry date: Aug 15, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M3/1555
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A method is provided for controlling the current intensity of the electric current flowing through an inductive consumer, the consumer being connected in series to a switching device and a current measuring unit, and in parallel to a free-wheeling element, and the switching device being activated for adjusting the current intensity during a pulse width modulation period. It is provided that a mean load voltage to be set during the pulse width modulation period is determined from an input current intensity with the aid of a first controller, the mean load voltage being set in the pulse width modulation period with the aid of the switching device at the consumer, the mean load voltage or a setpoint load voltage determined with the aid of a second controller from a predefined setpoint current intensity being fed to a model adapted to the consumer, and the input current intensity being ascertained from the difference between the predefined setpoint current intensity and a difference variable between an actual current intensity through the consumer and a model current intensity determined with the aid of the model. A circuit configuration for implementing the method is also provided.