| 摘要 |
The present document relates to power converters. In particular, the present document relates to free-wheeling detection and/or to the provisioning of the supply voltage of a driver circuit using a switched-mode power converter. A control circuit configured to re-charge supply voltage provisioning means (114) and configured to control the switching state of a power switch (106). The supply voltage provisioning means (114) are configured to provide a supply voltage to a gate of the power switch (106). The control circuit comprises a control switch (107) configured to couple an output of the power switch (106) to ground, when an input of the control switch (107) is coupled to the output of the power switch (106), to put the power switch (106) to an on-state. The control switch (107) is also configured to decouple the output of the power switch (106) from ground, to put the power switch (106) to an off-state. The control circuit further comprises charging circuitry (109, 111) configured to enable a charging current flowing from the output of the power switch (106) to the supply voltage provisioning means (114) and configured to disable a current flowing from the supply voltage provisioning means (114) to the output of the power switch (106), when an input of the charging circuitry (109, 111) is coupled to the output of the power switch (106) and when an output of the charging circuitry (109, 111) is coupled to the gate of the power switch (106) and to the supply voltage provisioning means (114). The charging current is derived from a current flowing through an input-to-output capacitance (104) arranged between an input and the output of the power switch (106). |
