Voltage-converting circuit for the power supply of an electrical consumer of high output, particularly a bobbin winding machine

US5796598A · kind A · utility

Assignee

• W. Schlafhorst AG & Co. · DE

Inventors

• Hans-Georg Nowak · Mönchengladbach, DE
• Michael Quante · Mönchengladbach, DE
• Frank Wefers · Mönchengladbach, DE
• Franz-Josef Flamm · Stolberg, DE

Key dates

• Filing date: Jan 27, 1997
• Grant date: Aug 18, 1998
• Expiry date: Jan 27, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M3/28
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An electric circuit for the conversion of a multiplicity of commercial power voltages to a predetermined supply voltage which is independent of the respective commercial power voltage, for a device with high electrical power requirements of high output, in the range up to 40 kW, such as a bobbin winding machine. The circuit contains a rectifier stage for generating a primary intermediate circuit DC voltage, a converter stage with power switches for generating a rectangular AC voltage, a high-power transformer with a connected secondary control circuit and a control stage which triggers the power switches at zero voltage in a phase-shift mode with a variable frequency and pulse width of the rectangular AC voltage as a function of the input voltage of the rectifier stage, the transformer primary winding current and both the voltage and the current in the secondary intermediate circuit.