Patent ID: 9209694
Filing Date: 2015-12-08
Classification: H02M,Y02B

Abstract:
1. A voltage converter, comprising: an inductor with a first terminal for supply of an input voltage; a first switch comprising a first transistor arranged between a second terminal of the inductor and a reference potential terminal; a second switch comprising a second transistor arranged between the second terminal of the inductor and an output of the voltage converter; and a control unit that comprises a clock input to which a clock signal having a cycle time is provided, wherein the control unit is configured to switch the first switch into a blocking operating state in a first and a second phase of a first operating mode of the voltage converter, and to switch the second switch into a conductive operating state in the first phase and into an operating state with a different conductivity in the second phase, wherein the cycle time, also referred to as a period duration, is the sum of a first duration of the first phase of the first operating mode and a second duration of the second phase of the first operating mode, and is constant, wherein the voltage converter is configured for step-down conversion in the first operating mode and for step-up conversion in a second operating mode, wherein, during the first phase, a first voltage is fed to a control terminal of the second switch, and, during the second phase, a second voltage is fed to the control terminal of the second switch, wherein the first voltage has a lower value than the second voltage, wherein the control unit comprises a voltage divider that is arranged between the first terminal of the inductor and the reference potential terminal, and wherein the control unit comprises a first changeover switch having a first input coupled to the reference potential terminal, a second input connected to a voltage divider tap of the voltage divider and an output connected to the control terminal of the second switch.