| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit arrangement of high cost efficiency, which can regulate a load current as the function of voltage drop at both ends of a load, preferably, as the function of temperature and comprises a small number of components for regulating a current due to a load, in particular, a fan motor. SOLUTION: A circuit arrangement 1 for the regulation of a current I<SB>L</SB>through a load R<SB>L</SB>comprises: a resistance, through which a load current I<SB>L</SB>flows and across which a voltage drops, which serves as a control variable X for the regulation of the load current I<SB>L</SB>, a tapping point P for a reference voltage V<SB>ref</SB>, which serves as a command variable W for the regulation of the load current I<SB>L</SB>, 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, in order to regulate the load current IL as the function of the load voltage VL, a transistor Q4 and also a collector resistance R2 and an emitter resistance R6 are arranged, wherein the series connection of the base-emitter section of the transistor Q4 and the emitter resistance R6 is arranged in parallel with the load R<SB>L</SB>, and wherein the tapping point P for the reference voltage is arranged between the collector resistance R2 and the transistor Q4. COPYRIGHT: (C)2009,JPO&INPIT
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