Voltage converter and method for voltage conversion

摘要

A voltage converter (10) comprises a converter input (11), a coil (13) with a first and a second coil terminal (14, 14′), a first switch (15) arranged between the first coil terminal (14) and a reference potential terminal (16), a second switch (17) arranged between the converter input (11) and the first coil terminal (14), a converter output (12) coupled to the second coil terminal (14′) and a control unit (18). The control unit (18) is configured to set the first switch (15) into a blocking state in a first phase (A) of an operating mode of the voltage converter (10) and into a diode mode in a second phase (B) of the operating mode of the voltage converter (10) and to set the second switch (17) into a conducting state in the first phase (A) and into a blocking state in the second phase (B).

主权项

1. A voltage converter, comprising:
a converter input to receive an input voltage; a coil with a first and a second coil terminal; a first switch arranged between the first coil terminal and a reference potential terminal; a second switch arranged between the converter input and the first coil terminal; a converter output coupled to the second coil terminal for providing an output voltage; and a control unit that is connected to a control terminal of the first switch and to a control terminal of the second switch and is configured to set the first switch into a blocking state in a first phase of an operating mode of the voltage converter and into a diode mode in a second phase of the operating mode of the voltage converter and to set the second switch into a conducting state in the first phase and into a blocking state in the second phase, wherein the first switch is implemented as a first field-effect transistor having a first output terminal, a second output terminal and a control terminal that is coupled to the control terminal of the first switch, and wherein the control unit comprises
a further field-effect transistor that is arranged between a bulk terminal of the first field-effect transistor and a node between the first coil terminal and the first switch, andan additional field-effect transistor that is arranged between the bulk terminal of the first field-effect transistor and the reference potential terminal.