Wide range input voltage for PSU/charger
Hi,
New member here.
I want to make a PSU/charger that delivers about 12V 0.2Amps for a cooling fan and also charges a 12V 1.2Ah lead-acid battery.
The input voltage is variable from 0 to 100Vrms at a frequency that varies from 20 to 100 Hz.
I have an all-analog circuit that works but I would like to use the benefits of switchmode in terms of dissipation and regulation.
I understand I would need two different circuits, because the battery may be fully discharged and I need the fan to start almost immediately.
I also understand that the circuit(s) will need a minimum voltage from the source to operate.
Thanks for pointing me in the right direction.
Comments
Your total output is 12V X (0.2 + 1.2)Amps . Ami I right?
No. The battery charge current will vary according to the capability of the circuit and the input voltage. Being a 1.2A.h, the charge current must be limited at about 0.2A.
About your input volttage ( 0 to 100VRMS) I do not understand the "0"
The input voltage is an audio signal coming from a power amp rated at 2500W into 4 ohms. Being an audio voltage, it is random.
What is your minimum input voltage you expect the power supply to operate?
With my analog design, I get the circuit to work with an input voltage of 20V peak.
Any signal less than 20Vpeak is ignored.
If your VINMIM = 20V, you can use a DPA family device for your application. DPA family needs a minimum of 16V to start up.
OK, I'll check them out. Thanks.
I've checked the DPA. they are good up to 75V only. I need 150V.
The solution hinted in DI-152 seems more adequate.
I am sorry I had not paid attention to your MAXVIN. Your MAXVIN is too large for DPA
You can use the PEAKSwitch family of devices or the Linkswithc family. Since your minimum Vin = 20VDA, you may need the circuit posted in the below link
Your total output is 12V X (0.2 + 1.2)Amps . Ami I right?
About your input volttage ( 0 to 100VRMS) I do not understand the "0"
What is your minimum input voltage you expect the power supply to operate?