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Ultra low power, clean 30V power supply + ultra low power high speed comparator?

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Marco:
These detectors are really into a class of their own as far as power consumption goes though.

How about using an ultra low power oscillator with output enable such as OV-7604-C7 and using a low power comparator to switch their output on/off as a pulse skipping boost converter? Similar to the Theremino power supply, but even lower power because you're not running any logic ICs in linear mode.

GEOelectronics:
"While I do have a working prototype of this detector already, it's consuming an abysmal ~1000-1100uA at 3V, which is completely unacceptable for a device meant to operate continuously in standby mode for weeks or months on small batteries.".

Can you post results of the detector portion? I haven't seen many successful attempts at building these regardless of the total current. You mention 1mA current as abysmal. To me that's good, if it is for the whole system, that would put it in line with a PM1703M system which can run for a month on a single AA battery, logging etc right on along.

George Dowell

Marco:
AFAICS simply using a large enough anode resistor (which increases the pulse duration) with a TLV7011 will allow detection with very low power consumption (5 uA for the comparator).

Use an OV-7604-C7 oscillator driving a BSS123 and some large inductor (1-100 mH) for a boost converter to get 30V. With an ultra low power comparator like the TLV7031 to turn the output of the oscillator on or off and to pull the gate down through a diode when it's turned off. This would have an irrelevant quiescent current of around 1 uA.

Spirit532:

--- Quote from: GEOelectronics on July 28, 2019, 01:46:47 pm ---Can you post results of the detector portion?

--- End quote ---
There's a short video on page 1 showing how it works, but other than that - I can get around 0.9-3cps/uSv/h(compared a few other meters) with a 10x10x30mm CsI:Tl crystal and the MicroFC-60035 SiPM from ON Semi(SensL), depending on how touchy I get with tweaking SiPM bias and amp gain. Not particularly reliably, but a prototype is a prototype.


--- Quote from: GEOelectronics on July 28, 2019, 01:46:47 pm ---If it is for the whole system

--- End quote ---
PSU and amp only at the moment. Given the recent suggestions, I should be able to get it much lower, which will get it closer to the Radiation Pager lifetimes, but much smarter.



--- Quote from: Marco on July 28, 2019, 04:59:59 pm ---AFAICS simply using a large enough anode resistor (which increases the pulse duration) with a TLV7011 will allow detection with very low power consumption (5 uA for the comparator).

--- End quote ---
Can you elaborate? The SiPM will go through a MIC860 to get amplified first. I don't think the TLV7011 can operate at an extremely low voltage(3-25mV pulses).


--- Quote from: Marco on July 28, 2019, 04:59:59 pm ---Use an OV-7604-C7 oscillator driving a BSS123 and some large inductor (1-100 mH) for a boost converter to get 30V. With an ultra low power comparator like the TLV7031 to turn the output of the oscillator on or off and to pull the gate down through a diode when it's turned off. This would have an irrelevant quiescent current of around 1 uA.

--- End quote ---
That is a great idea! I'll throw something together when I get the time, working on a different project right now(DIY SEM, no microamps required here...).
This could also be very useful for a high voltage SMPS for generic geiger-muller tubes, since the plateaus are much bigger there(10V ripple @ 410V is acceptable). A GM tube power supply that pulls <10uA on average would be a hit as well, though there's a bigger issue of high voltage measurement and hooking a boost up to a multiplier there.

GEOelectronics:
Can you elaborate? The SiPM will go through a MIC860 to get amplified first. I don't think the TLV7011 can operate at an extremely low voltage(3-25mV pulses)."

Have you considered going with a CZT direct?

By the way the PM1703 uses something very similar you your prototype.

Geo

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