# US 2019/0356273 A1 · Circuit Arrangement for Generating a Supply Voltage with Controllable Ground Potential Level

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- Number: US 2019/0356273 A1
- Document ID: US20190356273A1
- Status: Published application
- Kind: A1
- Application number: 16/411,355
- Filed: 2019-05-14
- Published: 2019-11-21
- Earliest claimed: 2018-05-15
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Walter Kreb; Ulrich LEHMANN; Wilhelm GRIESBAUM
- Web page: https://patentgrep.com/patent/US20190356273A1

## CPC

- H03F 1/0222: {by using a signal derived from the input signal}
- H03F 3/45475: {using IC blocks as the active amplifying circuit}
- G01R 15/14: Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- H03F 3/45071: {with semiconductor devices only}
- H03F 3/45928: {using IC blocks as the active amplifying circuit}
- H03F 2200/261: Amplifier which being suitable for instrumentation applications
- H03F 2203/45101: Control of the DC level being present
- H03F 2203/45138: Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers
- H03F 2203/45526: the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC
- H03F 2203/45586: the IC comprising offset generating means
- H03F: AMPLIFIERS
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A circuit arrangement for generating a supply voltage with a controllable ground potential level includes a voltage source that provides the supply voltage ungrounded, a control unit that generates an adjustable control d.c. voltage to ground, and an operational amplifier that is connected via its voltage supply terminals to the supply voltage source, where the control d.c. voltage is applied to the inverting input of the operational amplifier, the non-inverting input of the operational amplifier is connected via a resistor network to the voltage source and to a ground terminal and the output of the operational amplifier is fed back to the inverting input via a capacitor.

## Claims

### Claim 1

A circuit arrangement for generating a supply voltage with a controllable ground potential level, the circuit arrangement comprising:
a voltage source which provides the supply voltage ungrounded as a difference between two supply voltage potentials;
a control unit which generates an adjustable control d.c. voltage to ground; and
an operational amplifier having voltage supply terminals connected to the supply voltage potentials of the voltage source, the control d.c. voltage being applied to an inverting input of the operational amplifier, a non-inverting input of the operational amplifier being connected via a resistor network to the supply voltage potentials of the voltage source and to a ground terminal and an output of the operational amplifier being fed back to the inverting input via a capacitor.

### Claim 2 (depends on 2)

The circuit arrangement as claimed in claim 2, wherein the control unit is configured to generate the control d.c. voltage as an average value of at least two individually activatable and deactivatable fixed voltages.

### Claim 3 (depends on 1)

The circuit arrangement as claimed in claim 1, further comprising:
a resistor connected in series with the capacitor between the output of the operational amplifier and the inverting input of the operational amplifier.

### Claim 4 (depends on 2)

The circuit arrangement as claimed in claim 2, further comprising:
a resistor connected in series with the capacitor between the output of the operational amplifier and the inverting input of the operational amplifier.

### Claim 5 (depends on 1)

The circuit arrangement as claimed in claim 1, wherein the supply terminals of the operational amplifier are connected to the supply voltage potentials of the voltage source via Zener diodes.

### Claim 6 (depends on 1)

The circuit arrangement as claimed in claim 1, wherein the voltage source is configured as a d.c. to d.c. converter with electrical isolation of input and output sides.

### Claim 7 (depends on 1)

The circuit arrangement as claimed in claim 1, further comprising:
a differential amplifier having voltage supply terminals, the a differential amplifier being connected via the voltage supply terminals to the supply voltage potentials of the voltage source and being further connected to the ground terminal.