Regulating device for regulating the voltage on a high-side load
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United States of America Patent
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Mar 27, 2012
Grant Date -
Dec 17, 2009
app pub date -
Feb 14, 2007
filing date -
Apr 5, 2006
priority date (Note) -
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Abstract
The invention to an electronic control system, controlled by a pulse width-modulated signal (SG) related to earth, for regulating the voltage (Umot) across a high-side load (M), in particular a fan control unit for motor vehicles. The circuit part that converts the pulse width-modulated signal (SG) into the reference input variable (U−) needed for the regulation uses the positive potential of the supply voltage (V2) as reference potential, so that the reference input variable (U−) is likewise related to the positive potential of the supply voltage and the control signal (SG) is converted by means of a Zener diode (D1) and by means of a resistor (R5) connected parallel to the Zener diode (D1) into a control signal related to the positive supply potential and is further converted with a low pass filter (R7, C1) into a linear control signal, which serves as input reference variable (U−).
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