The Juice4Halt module is a supercapacitor based energy storage. It contains two independent DC/DC converters. The first one is a bidirectional step-up/step-down converter working as the interface between the stable 5V supply rail and the supercapacitor. During charging the converter works in step-down mode and transports energy from the external power supply to the supercapacitor. In case of a power failure the load device (Raspberry Pi or another SBC) is supplied from the supercapacitor via DC/DC converter working in step-up mode.
The second DC/DC converter is a Front-end step-down converter. The only function is converting a high input voltage down to 5.1V for the 5V rail. It is necessary to use the Front-end converter in case of an external power supply.
The Batteryless UPS for the Raspberry Pi – [Link]
This power-supply sequencer senses a loss of the main supply voltage and, by controlling the two FETs, automatically switches the load to the secondary (backup) supply.
The FET-OR connection for power supplies – [Link]
Cymbet Corporation announced the availability of the EnerChip CC CBC3105 smart solid state battery. The CBC3105 combines the manufacturer’s EnerChip battery with integrated input power conversion, battery management and regulated output capabilities. The device is a smart rechargeable solid state battery Uninterruptible Power Supply (UPS) in a chip that provides power backup to microelectronic devices when main power fails. It provides power supply monitoring and switches over to the internal solid state backup battery when the supply drops below a set threshold. The components can provide anywhere from several hours to several weeks of backup time. [via]
An Uninterruptible Power Supply in a Chip – [Link]
Ishan Karve writes:
I work in an office where working late in the night is the norm including weekends.. This post is not about my office or about the work we do late into the night but about a problem statement posed to me by my subordinates. It goes like this..
The office or rather the building rules demand that we shut down (hard off) all electrical equipment once the office is finally shut for the day. This means that our office servers also requires to be shut down along with the UPS (APC SMART 2200). Now this has nothing to do with our office trying to be green but more to do about obviating any fire risks.
So, whats the problem. The problem is that, once we (management) leave the office, the duty staff has to shut down all the equipment including the servers. The issue is that our two servers running WindoZe 2008 R2 and WindoZe 2003 take about 15 minutes to shut down cleanly. And the UPS then needs to be shutdown afterwards. 15 minutes may seem a small time interval for an office which works routinely for 15+ hours in a day in a single shifts 7 days a week. But at night 2330 when its time to go home every minute looks like an hour to the subordinate staff. So the problem was narrated to me over a short tea break. Since I believe in working Smarter and not Harder, I decided to save 15 man minutes every day.
APC UPS Shutdown Manager – [Link]