Circuit arrangement for the regulation of a current through a load
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United States of America Patent
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Apr 3, 2012
Grant Date -
Jan 29, 2009
app pub date -
Jul 22, 2008
filing date -
Jul 27, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A circuit arrangement (1) for the regulation of a current (IL) through a load (RL) comprises: a resistance (RS), through which a load current (IL) flows and across which a voltage (VS) drops, which serves as a control variable (X) for the regulation of the load current (IL), a tapping point (P) for a reference voltage (Vref), which serves as a command variable (W) for the regulation of the load current (IL), and a differential amplifier for the amplification of the control deviation (W−X) between command variable (W) and control variable (X). In the circuit arrangement (1) are provided for the regulation of the load current (IL) as a function of the load voltage (VL) a transistor (Q4) and also a collector resistance (R2) and an emitter resistance (R6), wherein the series connection of the base-emitter section of the transistor (Q4) and the emitter resistance (R6) is arranged parallel to the load (RL), and wherein the tapping point (P) for the reference voltage is arranged between the collector resistance (R2) and the transistor (Q4).
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