| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC voltage detecting device which can detect the output voltage of a DC power source such as a solar cell with no use of an expensive IC such as an isolation amplifier. SOLUTION: The DC outputs of a DC power source 11 is converted into an AC power by an inverter 13 and then outputted to a power system 14. The DC output voltage of the DC power source 11 is voltage-divided by a voltage divider part 21 and inputted to a comparator part 22. The comparator part 22 compares the output from the voltage divider part 21 to the chopping wave from a chopping wave form generating circuit 23 and outputs a chopping wave signal proportional to the DC voltage of the DC power source 11. A photo- coupler part 24 insulates the signal outputted from the comparator part 22, and outputs a rectangular wave signal matching the output level to a filter part 25. The filter part 25 filters the rectangular wave signal outputted from the photo-coupler part 24, and converts it into analogue signal proportional, in magnitude, to the DC voltage outputted from the DC power source 11 for outputting. |
