Device for voltage transformation
OwnerRoman Gronbach, Joerg Jehlickainventors
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Abstract
A device for voltage transformation of an input voltage into at least one output voltage is described, which includes at least one switching means (12), a freewheeling switching means (14), and an electrical energy accumulator (16, 18), the freewheeling switching means (14) being triggered for voltage transformation in normal operation. Monitoring means are provided for detecting when the output voltage exceeds a limit voltage, which trigger the freewheeling switching means (14) to limit the output voltage in the event the limit voltage is exceeded.
Claims9
A device for voltage transformation of an input voltage into at least one output voltage, including at least one switching means (12), a freewheeling switching means (14), and an electrical energy accumulator (16, 18), the freewheeling switching means (14) being triggered in normal operation for voltage transformation,
- wherein monitoring means (20, 22, 26, 31, 32, 36, 40) are provided for monitoring the output voltage (U) for exceeding a limit voltage which trigger the freewheeling switching means (14) in output voltage limiting operation if the limit voltage is exceeded, in order to limit the output voltage (U).
The device as recited in one of the preceding claims,
- wherein, if the limit voltage is exceeded, the normal operation of at least the freewheeling switching means (14) and/or the switching means (12) is deactivated.
The device as recited in one of the preceding claims,
- wherein overvoltage protection means (24, 28) are provided, which protect the freewheeling switching means (14) from overvoltages.
The device as recited in one of the preceding claims,
- wherein a measure of the output voltage (U) is fed to a Zener diode (26), the Zener diode being electrically conductively connected to at least one control input of the freewheeling switching means (14) and/or of a transistor (40).
The device as recited in one of the preceding claims,
- wherein the transistor (40) triggers the freewheeling switching means (14).
The device as recited in one of the preceding claims,
- wherein the freewheeling switching means (14) is connected to a reference potential (8).
The device as recited in one of the preceding claims,
- wherein, in output voltage limiting operation, the freewheling switching means (14) connects the input potential of the freewheeling switching means (14) to the reference potential (8).
The device as recited in one of the preceding claims,
- characterized by a preferred use in a multi-voltage vehicle electrical system of a motor vehicle.
Dependencies are inferred from the claim text.