Circuit configuration for limiting the output voltage of a clocked voltage regulator

US5596264A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Helmut Bichler · Gräfelfing, DE
• Michael Herfurth · Gilching, DE
• Martin Feldtkeller · Munich, DE
• Michael Lenz · Zorneding, DE

Key dates

• Filing date: Jun 22, 1995
• Grant date: Jan 21, 1997
• Expiry date: Jun 22, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B70/10
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A circuit configuration for limiting an output voltage of a clocked voltage regulator includes a control unit receiving a direct voltage to be regulated and having an output for supplying an output voltage. A voltage regulating amplifier is constructed as an integrator, receives the output voltage and a reference voltage, and supplies an output signal. A current threshold generator detects a current intensity of the integrator and supplies an output signal. A multiplier multiplies the output signal of the current threshold generator by the output signal of the voltage regulating amplifier and a signal obtained from the direct voltage to be regulated and supplies an output signal. A current regulating amplifier receives the output signal of the multiplier and a signal obtained from the direct voltage to be regulated and supplies an output signal. A driver stage converts the output signal of the current regulating amplifier into a trigger signal for the control unit. A comparator detects an output voltage of the voltage regulating amplifier and furnishes a dominant shutoff signal to the control unit if a reference voltage is exceeded.