Hi Nursyukriah,
Can I ask another question:
You have asked to light an incandescent lamp with a 150mV 30mA = 4.5mW power source. While all the information posted here about different generators etc would no doubt improve the electrical power output of the wind turbine, it seems that it is not your job to change the existing design of turbine and generator.
The trouble is that an incandescent lamp to operate at such a low voltage and power is not available, so would any of these options suit you:
(1) Moving coil meter to indicate power.
(2) Light emitting diode (LED) which illuminates to indicate power output.
The moving coil meter would be by far the simplest to implement and could give a reasonable indication of power output over quite a wide range. It is thus, the approach that I would recommend.
The LED approach would require an energy harvesting boost switching regulator using complex circuit techniques in view of the very low voltage. The boost regulator would then generate a constant current to power a LED. The math looks like this.
Power input = 4.5mW.
Assume a converter efficiency of 65% this gives an output power of , 0.65* 4.5mW= 2.93mW
The forward voltage of a red LED is 1.2V, so the current through the LED would be 2.93mW/1.2V = 2.44mA which would be sufficient to illuminate a small high efficiency red LED.
Would you like to give this some thought.
spec
Can I ask another question:
You have asked to light an incandescent lamp with a 150mV 30mA = 4.5mW power source. While all the information posted here about different generators etc would no doubt improve the electrical power output of the wind turbine, it seems that it is not your job to change the existing design of turbine and generator.
The trouble is that an incandescent lamp to operate at such a low voltage and power is not available, so would any of these options suit you:
(1) Moving coil meter to indicate power.
(2) Light emitting diode (LED) which illuminates to indicate power output.
The moving coil meter would be by far the simplest to implement and could give a reasonable indication of power output over quite a wide range. It is thus, the approach that I would recommend.
The LED approach would require an energy harvesting boost switching regulator using complex circuit techniques in view of the very low voltage. The boost regulator would then generate a constant current to power a LED. The math looks like this.
Power input = 4.5mW.
Assume a converter efficiency of 65% this gives an output power of , 0.65* 4.5mW= 2.93mW
The forward voltage of a red LED is 1.2V, so the current through the LED would be 2.93mW/1.2V = 2.44mA which would be sufficient to illuminate a small high efficiency red LED.
Would you like to give this some thought.
spec
Last edited: