| 摘要 |
The invention relates to an electrical circuit comprising a half-bridge (HB) having at least two transistors (T1, T2), a central connection (M) and a voltage supply, with which circuit an output voltage (UA) which is switchable between at least two voltage levels can be set to a reference potential (U0) by suitable switching of the at least two transistors (T1, T2). The electrical circuit has an auxiliary circuit (HS), which is connected to the central connection (M) of the half-bridge (HB) and has, for its part, at least two inductances (L2, L3), at least two transistors (T3, T4), at least two diodes (D1-D4) and at least two capacitances (C1-C6). The auxiliary circuit (HS) is in this case configured for the purpose of reducing power losses in the half-bridge (HB) in such a way that a current flow is generated by coordinated switching of at least one transistor (T3, T4) in the auxiliary circuit (HS) with switching operations of the transistors (T1, T2), said current flow enabling virtually current-free switching-off of the transistors (T1, T2) in the half-bridge (HB) and/or virtually voltage-free switching-on of the transistors (T1, T2) in the half-bridge (HB). The circuit is designed to bring about quick demagnetization of one of the at least two inductances (L2, L3) during operation of said circuit by virtue of the energy stored in the inductance (L2, L3) being transmitted into the voltage supply by opening of one of the transistors (T3, T4) in the auxiliary circuit (HS). |
