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Autronic has developed a customer specific 300 Watt DC/DC converter to be used with fuel cells so that it is possible to charge common 12V lead batteries from a low voltage source.
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The energy comes for example from a fuel cell. It is important here to operate the fuel cell exactly at MPP (the maximum power point) and to protect the fuel cell by means of a U/I characteristic from undervoltage and overload forward current. The parameters can be set according to customer requirements.
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The converter is used with an input voltage between 5 and 11.5VDC and an output of 14.3VDC for example to charge the additional battery in trucks or motor caravans for stationary operation of refrigerator, air conditioning and additional electronics.
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The polyphase design of the converter keeps the ripple in the input and output voltages low, even at low input and output voltage capacities, the result is a favourable EMC.
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In order to achieve a high efficiency (91..95%), the booster topology works without diodes, i.e. exclusively with synchronised MOSFETs. Here DirectFETS® are used that combine minimum losses with small dimension, and the special layout provides for a thermally optimal connection.
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External triggering is necessary to operate the converter in combination with a source. The converter can be separated from both the input and the output by integrated peak current relays. Due to this polarity safeguard as well as a minimum of quiescent current consumption are achieved.
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For leading the currents up to 50A, screw connectors (M6) are provided. Sense terminals which allow direct control at the battery make sure that even in case of long lines the charging of an accumulator is successful.
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The new converter (200x120x55mm) can be used within a temperature range between -30°C and +70°C, is equipped with protective functions regarding overvoltage, undervoltage, overcurrent and overtemperature. It further contains signals for input and output relays, input current monitor and excess temperature warning.
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