Modulator switching system having at least one semiconductor switch for adaptation to different load ranges and protection thresholds

US5285345A · kind A · utility

Assignee

• VDO Adolf Schindling AG · DE

Inventors

• Thomas Blumel · Möhrendorf, DE
• Joachim Meicher · Hofheim, DE
• Bernhard Lukas · Raunheim, DE
• Walter Kares · Frankfurt, DE

Key dates

• Filing date: Oct 31, 1991
• Grant date: Feb 8, 1994
• Expiry date: Oct 31, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K17/0826
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A modular switching system includes a transistor operative in a switching mode for applying current to a load. Adaptation of the system to accommodate different values of load is attained by coupling an input drive ,signal to a base terminal of the transistor via a variable gain amplifier wherein the gain is established by a load-adaption signal to meet the requisite base current drive signal for the load. Plural emitter terminals of the transistor connected to separate branches of a monitoring circuit, each branch having its own threshold detector, for monitoring of minimum and maximum values of load current.