Electrical circuit arrangement for converting an input voltage
First Claim
1. An electrical circuit for converting an input voltage into an impressed electrical output variable, there being a predetermined relationship between input voltage and output variable, whereinthe circuit comprises a regulator with a first resistor connected to an output of the regulator, the regulator further comprises a desired value input and an actual value input, and the output serves for outputting the output variable, and wherein the input voltage (ue) is fed to the desired value input (5) of the regulator (4), a negative feedback voltage (ug) proportional to the output variable is fed to the actual value input (6) of the regulator (4), said negative feedback voltage being a measure of either of an output voltage or an output current of the output variable (ua, ia) of the circuit arrangement, during operation of the regulator for converting the input voltage (ue) into the output voltage (ua), the negative feedback voltage is proportional to the output voltage, and during operation of the regulator for converting the input voltage (ue) into an output current (ia), the negative feedback voltage is proportional to the output current and is obtained from a voltage dropped across the first resistor (8) through which the output current (ia) flows.
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Accused Products
Abstract
An electrical circuit arrangement for converting an input voltage into an impressed electrical output variable, to convert the input voltage optionally into an output voltage or into an output current, wherein the input voltage is fed to the desired value input of a regulator. A negative feedback voltage is fed to the actual value input of the regulator, the voltage being a measure of the respectively effective output variable. For converting the input voltage into an impressed output voltage, the negative feedback voltage is a voltage proportional to the output voltage. For converting the input voltage into an impressed current, the negative feedback voltage is a voltage dropped across a resistor through which the output current flows. Circuit arrangements of this type serve for further processing of a unipolar voltage in circuit arrangements which require a current as input variable, or a voltage whose range deviates from that of the input voltage. This is the case e.g. when the digital output signal of a microprocessor is converted into an analog signal by pulse width modulation and averaging of the pulse-width-modulated signal.
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13 Claims
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1. An electrical circuit for converting an input voltage into an impressed electrical output variable, there being a predetermined relationship between input voltage and output variable, wherein
the circuit comprises a regulator with a first resistor connected to an output of the regulator, the regulator further comprises a desired value input and an actual value input, and the output serves for outputting the output variable, and wherein the input voltage (ue) is fed to the desired value input (5) of the regulator (4), a negative feedback voltage (ug) proportional to the output variable is fed to the actual value input (6) of the regulator (4), said negative feedback voltage being a measure of either of an output voltage or an output current of the output variable (ua, ia) of the circuit arrangement, during operation of the regulator for converting the input voltage (ue) into the output voltage (ua), the negative feedback voltage is proportional to the output voltage, and during operation of the regulator for converting the input voltage (ue) into an output current (ia), the negative feedback voltage is proportional to the output current and is obtained from a voltage dropped across the first resistor (8) through which the output current (ia) flows.
Specification