3 ms·

It would be better to run a dc circuit throughout a house just for lights and do away with the rectifier circuits inside these led globes and It could be free o

• londons_explore 7y ago
  I'm all for DC supplies in houses, but it doesn't quite solve the issue here. Any DC house-wide bus would see voltage drop along the wires, so all connected devices would have to handle an acceptable voltage range. Since LED's have a very steep IV curve, they really need either current control or a very big resistor to handle that voltage variation. Very big resistor = too much heat. So current control. And the only realistic way to achieve that is with a switched mode power supply. There is one benefit left for DC: The switched mode power supply could have much smaller input and output capacitors, and operate at much higher frequencies, therefore being much smaller.
  • Dylan16807 7y ago
    It solves the problem of your power disappearing every eight milliseconds. No rectifier, no higher voltages, the ability to use capacitors that are a thousand times smaller. And even if you did use a resistor, it wouldn't have to be too wasteful. If you use normal 14 gauge wiring, your resistance is probably half an ohm. At 48 volts, with a dozen 60-watt equivalent bulbs, your voltage drop is less than one volt.