Abstract: A device for voltage conversion includes a first, transformerless direct voltage converter unit having a first output potential connection and a second transformerless direct voltage converter unit having a second output potential connection. The two direct voltage converter units have a common input potential connection and a common reference potential connection. The first direct voltage converter unit generates, from the input voltage potential, a first output voltage potential on the first output potential connection, which has a higher voltage potential value relative to the reference voltage potential. The second direct voltage converter unit generates, from the input voltage potential, a second output voltage potential on the second output potential connection, which has a lower voltage potential value relative to the reference voltage potential. The device can be cost-effectively produced and provides sufficient safety.

Abstract: A device for voltage conversion includes a first, transformerless direct voltage converter unit having a first output potential connection and a second transformerless direct voltage converter unit having a second output potential connection. The two direct voltage converter units have a common input potential connection and a common reference potential connection. The first direct voltage converter unit generates, from the input voltage potential, a first output voltage potential on the first output potential connection, which has a higher voltage potential value relative to the reference voltage potential. The second direct voltage converter unit generates, from the input voltage potential, a second output voltage potential on the second output potential connection, which has a lower voltage potential value relative to the reference voltage potential. The device can be cost-effectively produced and provides sufficient safety.

Abstract: A step-up converter converts a battery voltage to an intermediate voltage. The intermediate voltage is greater than or equal to the battery voltage. A step-down converter receives the intermediate voltage supplied by the step-up converter and controls an output voltage which is less than or equal to the intermediate voltage. The step-up converter controls the intermediate voltage in an open loop depending on the battery voltage, at least if the battery voltage is lower than a first predetermined value, and at least if at the same time the load on the output of the step-up converter exceeds a minimum load.

Abstract: A step-up converter converts a battery voltage to an intermediate voltage. The intermediate voltage is greater than or equal to the battery voltage. A step-down converter receives the intermediate voltage supplied by the step-up converter and controls an output voltage which is less than or equal to the intermediate voltage. The step-up converter controls the intermediate voltage in an open loop depending on the battery voltage, at least if the battery voltage is lower than a first predetermined value, and at least if at the same time the load on the output of the step-up converter exceeds a minimum load.