Externet
Well-Known Member
Which way to put together a power supply that will work from a standalone 12V lead acid battery source, not being charged (not 14V)
With two selectable outputs (not simoultaneous):
1- > Adjustable pure DC from about 30 VDC to 160VDC, capable of 3 Amperes.
2- > Pulsed DC 30 to 160 V, up to 3 Amperes, from 1% to 50% duty cycle square wave.
[- An optional but not needed yet, additional future mode could be 0 to 120 VAC adjustable output, up to 3 Amperes, 20 Hz to 120 Hz.]
Seems a plain off-the-shelf ~500 Watt inverter for recreational campers and alike should be able to provide the first stage from 12VDC to 120VAC which rectified and filtered can become 160VDC. But I have tested a couple that refuse to work unless there is at least 13.5V on the battery (being charged)
Then a method to make it variable/adjustable.
From the pure DC source, adjustable chopping by PWM for the second mode ?
Battery-----> inverter -----> rectifier------> filtering -----> linear regulator----->output mode 1-----> chopper-----> output mode 2 ??
What building blocks or circuits do you see as convenient to use? Or, modifying an UPS ? Modifying a subwoofer mobile amplifier ? Modifying a 500W inverter ? Other ?
It is for an experimental soil tester.
With two selectable outputs (not simoultaneous):
1- > Adjustable pure DC from about 30 VDC to 160VDC, capable of 3 Amperes.
2- > Pulsed DC 30 to 160 V, up to 3 Amperes, from 1% to 50% duty cycle square wave.
[- An optional but not needed yet, additional future mode could be 0 to 120 VAC adjustable output, up to 3 Amperes, 20 Hz to 120 Hz.]
Seems a plain off-the-shelf ~500 Watt inverter for recreational campers and alike should be able to provide the first stage from 12VDC to 120VAC which rectified and filtered can become 160VDC. But I have tested a couple that refuse to work unless there is at least 13.5V on the battery (being charged)
Then a method to make it variable/adjustable.
From the pure DC source, adjustable chopping by PWM for the second mode ?
Battery-----> inverter -----> rectifier------> filtering -----> linear regulator----->output mode 1-----> chopper-----> output mode 2 ??
What building blocks or circuits do you see as convenient to use? Or, modifying an UPS ? Modifying a subwoofer mobile amplifier ? Modifying a 500W inverter ? Other ?
It is for an experimental soil tester.