| 摘要 |
The invention relates to a power output stage (1), in particular for a controller of an electrical machine (2) for a motor vehicle, comprising at least one control unit (8) and comprising at least four semiconductor switches (HS1, HS2, LS1, LS2) which can be individually actuated by the control unit (8) and which are connected to at least two half-bridges (4, 5) for operating the electrical machine (2) in order to form a bridge circuit (3), and are connected to a supply line (6) and an earth line (7) of the power output stage (1). Provision is made for the control unit (8) to have a controllable first pull-up apparatus (PU1) and a controllable first pull-down apparatus (PD1) for a first of the half-bridges (4) and a controllable second pull-up apparatus (PU2) and a controllable second pull-down apparatus (PD2) for a second of the half-bridges (5), the control unit (8) actuating the semiconductor switches (HS1, HS2, LS1, LS2) the pull-up apparatuses (PU1, PU2) and the pull-down apparatuses (PD1, PD2) in a short-circuit test mode in order to detect a short-circuit current. |
| 主权项 |
1. A power output stage (1), comprising at least one control unit (8) and comprising at least four semiconductor switches (HS1, HS2, LS1, LS2) which can be individually actuated by the control unit (8) and which are connected to at least two half-bridges (4, 5) for operating an electrical machine (2) in order to form a bridge circuit (3), and are connected to a supply line (6) and an earth line (7) of the power output stage (1), characterized in that the control unit (8) has a controllable first pull-up apparatus (PU1) and a controllable first pull-down apparatus (PD1) for a first of the half-bridges (4) and a controllable second pull-up apparatus (PU2) and a controllable second pull-down apparatus (PD2) for a second of the half-bridges (5), the control unit (8) actuating the semiconductor switches (HS1, HS2, LS1, LS2), the pull-up apparatuses (PU1, PU2) and the pull-down apparatuses (PD1, PD2) in a short-circuit test mode in order to detect short-circuit current; the control unit (8) configured to detect a short-circuit current by:
a) switching on the pull-down apparatuses (PD1, PD2) and detecting a first output voltage of the respective half-bridge (4, 5) and comparing the detected first output voltage to a first target value (GND), and consecutively activating the high-voltage side semiconductor switches (HS1, HS2) of the half-bridges (3, 4) and detecting a second output voltage of the respective half-bridge (4, 5) and comparing the detected second output voltage to a second target value (Ubat), b) switching on the pull-up apparatuses (PU1, PU2) and detecting a third output voltage of the half-bridges (4, 5) and comparing the detected third output voltage to the second target value (Ubat), and consecutively activating the low-voltage side semiconductor switches (LS1, LS2) of the half-bridges (4, 5) and detecting a fourth output voltage of the half-bridges (4, 5) and comparing the detected fourth output voltage to the first target value (GND). |
