Circuit arrangement for the temperature-dependent load current regulation

摘要

The invention relates to a circuit arrangement (2) for controlling a current (i_L) by means of a load (r_L), comprising: a resistor (r_S), the from the load current (i_L) flowing through it and on which a voltage (v_S) drops, which as a control parameter for the regulation of the let roms (i_L) is used, a tap (p) for a reference voltage (v_ref), which as a command variable for control of the load current (i_L) , and a differential amplifier for amplifying the control deviation (v_ref - V_S). The differential amplifier has, for the regulation of the load current (i_L) as a function of the temperature of a first and second transistor (q1, q2), and the circuit arrangement (2), the operation of the two transistors (q1, q2) in the case of the same collector - emitter - voltage (u_Ce1, U_Ce2) and a constant and of one of a different ratio of the collector currents (i rest_C1, I_C2) , designed so that the circuit arrangement (2), by means of the half conductor physically dictated temperature voltage is controlled, the load current (i_L) as a function of the temperature controls defined. The present invention also relates to a force of a vehicle fan with such a circuit arrangement (2) and an associated method.