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Fit and Forget - Converters and Power Supplies for the Communications, Automotive and Marine Industries
How do I use the continuous and intermittent ratings?
You need to match the load characteristics with the continuous and intermittent ratings of our converters. Different applications can have quite different load characteristics. The load must fit within the specifications for both continuous and peak current requirements. Some examples follow.
Radio telephones spend most of their time listening with short transmit times and therefore the average current usage is low so the peak current requirement is likely to specify the correct unit.
Cell phones and phones transmitting data may be transmitting for long periods, so this may bias the selection toward the continuous rating.
GSM phones may average 4 watts of transmit power, possibly more, but due to the multiplexing arrangement where several phones can share the same slot they only transmit for one period out of 8, so there are high peak powers to get four watts of average power. The converter needs to handle these peaks. Our GSM units are the PV3i and PV3s.
On the other hand, if you are specifying converters for running American headlamps on a European truck, the continuous rating will determine the unit because headlamps are likely to be run for long periods. The same is true of refrigerators, televisions and cool boxes.
Radio telephones spend most of their time listening with short transmit times and therefore the average current usage is low so the peak current requirement is likely to specify the correct unit.
Cell phones and phones transmitting data may be transmitting for long periods, so this may bias the selection toward the continuous rating.
GSM phones may average 4 watts of transmit power, possibly more, but due to the multiplexing arrangement where several phones can share the same slot they only transmit for one period out of 8, so there are high peak powers to get four watts of average power. The converter needs to handle these peaks. Our GSM units are the PV3i and PV3s.
On the other hand, if you are specifying converters for running American headlamps on a European truck, the continuous rating will determine the unit because headlamps are likely to be run for long periods. The same is true of refrigerators, televisions and cool boxes.
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