| 摘要 |
A circuit having a plurality of parallel-connected partial circuits for feeding an inverter circuit. A partial circuit comprises an unregulated voltage source with a temporally variable output DC voltage and a synchronous converter having an automatically functioning regulating circuit. The circuit is triggered according to two modes of operation. The first mode of operation is as an upward converter, when the value of the output voltage of the unregulated voltage source exceeds a threshold value, and thus the inverter circuit is supplied with the requisite input voltage. The second mode of operation is as a downward converter, when the value of an output voltage of the unregulated voltage source is below a threshold value, or when there is no output voltage from the unregulated voltage source, in which case a first capacitor is charged from the DC voltage applied to the second terminals.
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