| 摘要 |
The power supply device has a four-voltage selection device (B) as well as at least one set consisting of rectifier (C) and one current inverter (E) and two transformers (G, F), the frequency-independent loads being connected to one of the above and the frequency-dependent loads, for example, refrigerating units with motors (M) which are dependent on the frequency of the speed of rotation are connected to the other. Given direct current supply, the two transformers (G, F) are fed via the current inverter, given alternating current supply, the transformer for the frequency-independent loads is fed directly and the other transformer is fed via the rectifier (C) and the current inverter (E). The transformers are provided with different input terminals so that, depending on the supply voltage available, the supply line is connected in such a way that, irrespective of the supply voltage, the same load voltage is always available at the output. A rectifier (H) is also provided for the direct current loads at the output of the first transformer (G). Devices of this kind can be used in trains in which the bus line can have four different voltages, that is to say for example 1500 V= and 3000 V= as well as 1000 V SIMILAR (16 2/3 Hz) and 1500 V SIMILAR (50 Hz). In comparison with previous devices, this arrangement provides the advantage that it results in a substantial simplification of the feed line, and thus in a reduction of the weight and of course also a lowering of costs. <IMAGE> |
