US 6,784,669 B2 · Electrical circuit arrangement for converting an electrical input variable into an impressed output electrical voltage

Abstract

An electrical voltage arrangement to be provided with selectively different electrical input variables, for example in the form of a unidirectional voltage, a bidirectional voltage or a unidirectional current, can be converted into an impressed electrical output voltage. At the same time, there is to be a predefined relationship between the input variable and the output voltage. The circuit arrangement contains a first arithmetic circuit which converts a voltage fed to it into a first impressed voltage, and a second arithmetic circuit which converts an input voltage fed to it into a second impressed voltage. The voltage which is present at the input terminals of the circuit arrangenent is fed to the first arithmetic circuit. The voltage which drops across a resistor which can be connected to the input terminals of the circuit arrangement is fed to the second arithmetic circuit. If the input variable which is to be converted is a voltage, the output voltage of the first arithmetic circuit is used as an output voltage of the circuit arrangement. If the input variable which is to be converted is a current, the current is fed to the resistor, and the output voltage of the second arithmetic circuit is used as the output voltage of the circuit arrangement. The circuit arrangement is provided for use in automation equipment.

Claims14

Dependent claims

Electrical circuit arrangement for converting an electrical input variable (voltage or current) into an impressed electrical output voltage, there being a predefined relationship between the input variable and the output voltage, wherein

a first arithmetic circuit (15) is provided which converts a voltage (ue1) fed therein in a first impressed voltage (ua1),
a second arithmetic circuit (20) is provided which converts an input voltage (ue2) fed thereto into a second impressed voltage (ua2),
a voltage (ue) present at input terminals (11, 12) of the circuit arrangement (10) is fed to the first arithmetic circuit (15),
the voltage (ue2) which drops across a resistor (25) which is connectable to the input terminals (11, 12) of the circuit arrangement (10) is fed to the second arithmetic circuit (20),
for conversion of voltage (ue), output voltage (ua1) of the first arithmetic circuit (15) is used as output voltage (ua) of the circuit arrangement (10), and
for conversion of a current (ie), the current (ie) is fed to the resistor (25) and output voltage (ua2) of the second arithmetic circuit (20) is used as the output voltage (ua) of the circuit arrangement (10),
wherein the resistor (25) is connected to the input terminals (11, 12) of the circuit arrangement (10) via a switch (26),
a changeover switch (27) connects output (18 or 23) of arithmetic circuit (15, 20) to output (13) of the circuit arrangement (10),
for conversion of a voltage (ue), the switch (26) is opened and the changeover switch (27) feeds the output voltage (ua1) of the first arithmetic circuit (15) to the output (13) of the circuit arrangement (10), and
for conversion of a current (ie), the switch (26) is closed and the changeover switch (27) feeds the output voltage (ua2) of the second arithmetic circuit (20) to the output (13) of the circuit arrangement (10).

7 more elements

a first arithmetic circuit (15) is provided which converts a voltage (ue1) fed therein in a first impressed voltage (ua1),
a second arithmetic circuit (20) is provided which converts an input voltage (ue2) fed thereto into a second impressed voltage (ua2),
a voltage (ue) present at input terminals (11, 12) of the circuit arrangement (10) is fed to the first arithmetic circuit (15),
the voltage (ue2) which drops across a resistor (25) which is connectable to the input terminals (11, 12) of the circuit arrangement (10) is fed to the second arithmetic circuit (20),
for conversion of voltage (ue), output voltage (ua1) of the first arithmetic circuit (15) is used as output voltage (ua) of the circuit arrangement (10), and
for conversion of a current (ie), the current (ie) is fed to the resistor (25) and output voltage (ua2) of the second arithmetic circuit (20) is used as the output voltage (ua) of the circuit arrangement (10),
wherein the first arithmetic circuit (15) has a first operational amplifier (31),
an inverting input of the first operational amplifier (31) is connected to its output via a second resistor (33), and to a first input terminal (16) of the first arithmetic circuit (15) via a third resistor (32),
a non-inverting input of the first operational amplifier (31) is connected to reference potential (i) via a fourth resistor (35), and to a second input terminal (17) of the first arithmetic circuit (15) via a fifth resistor (34),
the second arithmetic circuit (20) has a second operational amplifier (36),
an inverting input of the second operational amplifier (36) is connected to its output via a sixth resistor (38) and to a first input terminal (21) of the second arithmetic circuit (20) via a seventh resistor (37), and
a non-inverting input of the second operational amplifier (36) is connected to reference potential (i) via an eighth resistor (40) and to a second input terminal (22) of the second arithmetic circuit (20) via a ninth resistor (39).

9 more elements

a first arithmetic circuit (15) is provided which converts a voltage (ue1) fed therein in a first impressed voltage (ua1),
a second arithmetic circuit (20) is provided which converts an input voltage (ue2) fed thereto into a second impressed voltage (ua2),
a voltage (ue) present at input terminals (11, 12) of the circuit arrangement (10) is fed to the first arithmetic circuit (15),
the voltage (ue2) which drops across a resistor (25) which is connectable to the input terminals (11, 12) of the circuit arrangement (10) is fed to the second arithmetic circuit (20),
for conversion of voltage (ue), output voltage (ua1) of the first arithmetic circuit (15) is used as output voltage (ua) of the circuit arrangement (10), and
for conversion of a current (ie), the current (ie) is fed to the resistor (25) and output voltage (ua2) of the second arithmetic circuit (20) is used as the output voltage (ua) of the circuit arrangement (10),
wherein the resistor (25) is connected to the input terminals (11, 12) of the circuit arrangement (10) via a switch (26),
a changeover switch (27) connects output (18 or 23) of arithmetic circuit (15, 20) to output (13) of the circuit arrangement (10),
output (16) of the first arithmetic circuit (15) is connected to one (27u) of inputs of the changeover switch (27) via a second resistor (47),
output (23) of the second arithmetic circuit (20) is connected to other input (27i) of the changeover switch (27) via a third resistor (50),
the one input (27u) of the changeover switch (27) is connected to a first constant voltage (1) via a first diode (48) and to a second constant voltage (Uk2) via a second diode (49), and
the other input (27i) of the changeover switch (27) is connected to the first constant voltage (1) via a third diode (51) and to the second constant voltage (Uk2) via a fourth diode (52).

9 more elements

Dependencies are inferred from the claim text.

Electrical circuit arrangement for converting an electrical input variable into an impressed output electrical voltage

Life of this patent

Electrical circuit arrangement for converting an electrical input variable into an impressed output electrical voltage

Life of this patent

Abstract

Claims14