Drive circuit

US6621309B2 · kind B2 · utility

Assignee

• AFL Germany Electronics GmbH · DE

Inventors

• Matthias Roder · Hamburg, DE
• Horst Flock · Reutlingen, DE

Key dates

• Filing date: Aug 8, 2002
• Grant date: Sep 16, 2003
• Expiry date: Aug 8, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K17/08148
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

To improve a control circuit for at least one inductive load, comprising a first load branch, which lies between a first voltage terminal and a second voltage terminal and comprises an electronic switch and the inductive load connected in series, the electronic switch lying between a first terminal of the inductive load and the first voltage terminal, and a second terminal of the inductive load being in connection with the second voltage terminal, a freewheeling diode, via which a freewheeling current of the inductive load flows when the electronic switch is open, in such a way that smallest possible fluctuations of the supply current and smallest possible voltage peaks occur at the voltage terminals, it is proposed that there is provided a freewheeling branch which has, as a series connection, a capacitance connected to the first voltage terminal and an inductance connected to the second terminal of the inductive load, and also a freewheeling diode lying between a center tap between the capacitance and the inductance of the freewheeling branch and the first terminal of the inductive load.