| 摘要 |
The invention relates to a voltage converter (1) for a motor vehicle. Said voltage converter (1) comprises a transformer (10) and a power output stage (7). The power output stage (7) comprises at least two semiconductor switches (20, 22, 24, 26) that are connected to the transformer (10), in particular to a primary winding (12) of said transformer (10). The voltage converter (1) has a driver stage (31) which is connected, on the output side, to a control connection of the semiconductor switch (20, 22, 24, 26) and which is designed to actuate said semiconductor switch (20, 22, 24, 26) using a control signal (93, 94), for the purpose of generating an alternating voltage. According to the invention, the driver stage (31) is connected, on the input side, to a pulse signal generator (35) and an input capacitor (60, 62). The pulse signal generator (35) is designed to generate a pulse signal (37, 38) and to actuate the driver stage (31) using the pulse signal (37, 38) in order to generate the control signal (93, 94). For at least one incipient half-wave of the alternating voltage, the pulse signal (37, 38) has at least one prepulse and one main pulse that generates the half-wave, the prepulse being designed to preload the input capacitor (60, 62) of the driver stage (31) such that complete switching of the semiconductor switch (20, 22, 24, 26) can occur more quickly than it could without a prepulse. |
