MEDICAL DEVICE RESEARCH
Small battery. Important job.
We’re exploring ways to help heart monitors, pacemakers and wearables use less energy. Our first checks run on computers; next comes a closer look at battery life.
Explore medical researchRESEARCH UPDATE · 30 OCTOBER 2026
Our latest work adds medical-device research to studies of batteries, energy recovery, heat and shared radio hardware.
See the device energy studiesMEDICAL DEVICE RESEARCH
We’re exploring ways to help heart monitors, pacemakers and wearables use less energy. Our first checks run on computers; next comes a closer look at battery life.
Explore medical researchGRAPHENE BATTERY RESEARCH
Our preliminary models explore unwanted charge leakage and useful charge flow in graphene-based battery materials. The results were mixed, with apparent improvements under one condition accompanied by worse leakage under another. Proposed material measurements are the next research milestone.
Explore battery researchENERGY STORAGE · R5 SIMULATION
In the 90-second lift-cycle model, an added capacitor stores braking energy that the battery cannot accept quickly enough. Grid energy falls 30.01% when battery charging is limited to 12 W. At a 64 W limit, grid energy rises 6.47%.
Both designs do the same lifting and lowering work and finish at the same modeled stored-energy levels. This actuator study is separate from the graphene-materials project.
The 12 V job lowers and lifts 400 J, taking five seconds each way, then allows 80 seconds for idling and restoring stored energy. Four 100 F cells connected in series form a 25 F buffer. The conventional design returns braking energy to the battery under the same assumed charge limit.
Both designs include a 1.5 W auxiliary load, 80% motor/generator efficiency and 90% grid recharge efficiency. The nominal buffer budget includes 0.25 W for control, 1 J to wake each cycle, an 88%-efficient converter in each direction and 0.1 Ω battery resistance. Nominal grid energy falls from 718.649 J to 502.952 J per cycle.
The saving falls to 18.76% with higher assumed costs and 15.49% at intermediate battery charge acceptance. At 64 W acceptance, grid energy rises from 448.543 J to 477.561 J. The added cells weigh 84.4 g; the assumed integration mass is 200 g in the nominal case or 300 g in the adverse case. Energy for moving that added mass remains outside the model.
A scalar energy balance restores the stored-energy endpoints. A simulation that tracks the system’s state over time remains open. The saved snapshot checks covered the exact model, case and output hashes; the written independent final review was still pending.
TI bidirectional controller reference · Maxwell 100 F cell datasheet · Exact study identities
POWER SUPPLIES · CONDITIONAL MODEL
At the same electrical output, the modeled supply uses 1.19% less input energy than an assumed 94.5%-efficient reference. Heat inside the supply falls 20.28%.
The full AC/DC loss budget and physical layout remain open.
Seven capacitors meet the model’s 10 ms hold-up target.
The model covers a standalone isolated 24 V, 20 A supply that delivers 480 W from 230 V AC for 24 hours. The useful output leaves the supply’s thermal boundary, and both designs use an assumed 2 W fan.
Seven 470 μF, 450 V capacitors provide 3,290 μF nominal. That becomes 2,368.8 μF after −20% tolerance and an assumed further 10% aging reserve. The model supplies 7.428432 J against a 4.977188 J hold-up requirement. The capacitors’ nominal circular footprints total 6,735 mm². Their layout and complete installed mass remain unresolved.
Heat reduction inside the supply falls to 12.46% against a 95%-efficient reference and 3.06% against a 95.5%-efficient reference. Comparison with the strongest conventional 24 V supply meeting the same requirements remains open. An independent critic reran the saved R5 result and matched it byte for byte.
TI 24 V supply reference · TDK capacitor datasheet · Exact study identities
SHARED RADIO · DESIGN COMPARISON
One radio handles both tasks by taking turns in the model. An existing TI one-chip design uses the same modeled energy as our proposed arrangement, leaving zero extra saving in this comparison.
The motion-tag reference keeps continuous 100 Hz acceleration and Bluetooth Low Energy plus IEEE 802.15.4 reporting. With relaxed requirements and reports every 60 seconds, the comparison against a two-chip design saves 13.96% under optimistic assumptions or 8.94% under nominal assumptions. Against the ordinary scheduled TI design, the saving is zero.
The one-radio arrangement fails both simultaneous independent reception and continued independent operation after a chip fault. At the saved consolidation checkpoint, the critic rejected the claimed saving of at least 10% over the ordinary design, and the exact artifact readback failed.
TI Dynamic Multiprotocol Manager scheduling · Exact comparison identities
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