![]() ![]() So, if the supply voltage doubles you will still want 12.5 watts (approximately) passing through the transformer. I guess you are running about 10 watts to your load.Īs the bus rises you won't want that power to change. This will be the power you have estimated going into your load with an extra bit for the inefficiences of the power supply. This also tells me that the energy transferred per cycle (assuming a discontinuous situation) is 0.125 mJ and, at a switching frequency of 100 kHz, this is equivalent to a power transfer of 12.5 watts. It's just a rearrangement of V = L di/dt. This assumes a bus voltage of 100 V and a duty of 50%. If bus voltage doubles, roughly speaking, the duty cycle will halve so that it maintains the same energy transfer per switching cycle through the transformer and on to the load.Īs an example, if your primary inductance is 1 mH and the switching frequency is 100 kHz, the current in the primary will reach a peak of 0.5 amps after 5 us. You don't appear to have factored this into your analysis correctly. As bus voltage rises, duty cycle lowers to keep the output voltage (across the load) regulated. ![]() At the lowest bus voltage, the duty cycle of the switching needs to be close to maximum on full output load. ![]()
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