AI data ce te s a e shifti g f om today’s 400V AC powe systems to a ew 800V DC sta da d that ca delive powe mo e efficie tly. This shift is still i its ea ly stages: it is bei g piloted a d sta da dized th ough the Ope Compute P oject (OCP), a i dust y g oup that sets tech ical specificatio s fo data ce te ha dwa e.
Hillc est’s pape compa es two ways to build the powe supply fo a 800V data ce te : a mo e complex two-stage desig , a d a simple si gle-stage desig built o the Compa y’s p op ieta y ze o-voltage-switchi g (ZVS) tech ology. The mai i dust y co ce with movi g to a si gle-stage desig is safety: emovi g a co ve sio stage also emoves a laye of isolatio that has t aditio ally helped co tai elect ical faults. The pape add esses this di ectly. Its si gle-stage desig keeps both galva ic isolatio ba ie s a data ce te equi es (o e at the medium-voltage t a sfo me , o e at the IT ack) a d adds dedicated fault-ma ageme t fu ctio s to take ove the p otective ole the emoved stage used to se ve. I simulatio , this desig also co ve ted powe mo e efficie tly tha the two-stage alte ative. Hillc est’s ZVS PCS1000, the Compa y’s p ototype powe supply u it, is built o this same si gle-stage desig .
Read the tech ical pape he e.
Efficie cy imp oveme t: The si gle-stage ZVS a chitectu e is modeled at app oximately 99% AC-DC co ve sio efficie cy (up to 99.2%), compa ed with 98% fo the mo e co ve tio al two-stage 800V desig . That is a g eate tha 1 pe ce tage poi t imp oveme t at the powe -co ve sio stage.
Reduced complexity, mai tai ed safety isolatio : The si gle-stage desig elimi ates a i te mediate 800V-to-800V isolated DC-DC co ve sio stage p ese t i the co ve tio al two-stage 800V desig , while p ese vi g two full galva ic isolatio ba ie s (o e at the medium-voltage li e-f eque cy t a sfo me a d o e at the IT- ack DC-DC co ve te ), co siste t with datace te safety equi eme ts.
Lowe compo e t cou t a d cooli g load: By educi g co ve sio stages, the a chitectu e lowe s compo e t cou t elative to the co ve tio al two-stage a chitectu e alte ative, which the pape li ks to imp oved eliability a d educed cooli g equi eme ts.
Hillc est’s ZVS PCS1000 is the Compa y’s p ototype powe supply u it built o the si gle-stage ZVS a chitectu e a alyzed i the pape . As a esult, the PCS1000 is desig ed to captu e two disti ct, stacki g laye s of be efit: the adva tages of si gle-stage co ve sio evaluated i the pape (efficie cy, compo e t cou t, cooli g), a d additio al adva tages specific to the ZVS topology used to impleme t that si gle stage[1]. These a e be efits a si gle-stage desig usi g co ve tio al ha d switchi g would ot achieve:
Highe switchi g f eque cy without a switchi g-loss pe alty: Because ZVS switches at ze o voltage, the PCS1000 ca ope ate at 48kHz ( oughly fou times the f eque cy of co ve tio al ha d-switched co ve te s), without i cu i g the switchi g losses that f eque cy i c ease would o mally i t oduce.
Lowe EMI a d simple filte i g: The highe switchi g f eque cy, combi ed with ZVS co t ols, educes elect omag etic i te fe e ce elative to ha d-switched desig s, simplifyi g i put filte equi eme ts a d easi g g id a d EMC complia ce.
Reduced the mal st ess a d imp oved eliability: Lowe switchi g losses educe ju ctio tempe atu es a d the mal cycli g i the PCS1000’s powe semico ducto s, suppo ti g the eliability a d lifetime dema ds of co ti uous datace te ope atio .
“This pape validates the si gle-stage app oach o its ow me its. What makes the PCS1000 diffe e t is that it does ‘t just emove a co ve sio stage – it does so usi g Hillc est’s ZVS tech ology, so we captu e the si gle-stage gai a d the switchi g-f eque cy, EMI, a d eliability be efits that come f om how we impleme t it. The PCS1000 platfo m offe s a ve satile powe co ve sio solutio that ca be deployed ac oss a wide a ge of DC elect ificatio applicatio s.” said Ema uel Se ba , VP of E gi ee i g at Hillc est.
The PCS1000 is a p ototype ZVS powe supply u it developed by Hillc est fo 800V datace te sideca powe acks, desig ed to co ve t 400/480V AC facility powe di ectly to 800V DC fo delive y to the IT ack i a si gle co ve sio stage. The u it is bei g desig ed fo modula , N+1 edu da t deployme t, suppo ti g scali g f om si gle-u it i stallatio s to multi-megawatt sideca co figu atio s fo high-de sity AI compute pods. The PCS1000 is cu e tly i the p ototype stage.
Hillc est is also pleased to a ou ce it has etai ed Outside the Box Capital I c. to p ovide i vesto ma keti g a d dist ibutio se vices.
Outside the Box Capital I c., located at 2202 G ee O cha d Place, Oakville O ta io L6H 4V4, will p ovide se vices i cludi g the publicatio a d dissemi atio of i fo matio about the Compa y o social media a d othe commu ity-d ive platfo ms, such as Reddit, Disco d, Teleg am a d Twitte .
The compa y’s CEO, Jaso Coles (
I co side atio of the Se vices to be pe fo med betwee July 20, 2026, a d Septembe 30, 2026, the Compa y has ag eed to pay $50,000, plus applicable taxes.
Hillc est E e gy Tech ologies Ltd. is a Ca adia clea tech ology compa y developi g adva ced powe co ve sio tech ologies a d digital co t ol systems fo ext-ge e atio e e gy applicatio s, i cludi g AI datace te s, e e gy sto age, mic og ids, a d elect ic-vehicle powe t ai s. The Compa y’s p op ieta y Ze o Voltage Switchi g (ZVS) tech ology has bee i depe de tly validated at the facilities of global automotive OEMs a d Tie O e supplie s. Fo mo e i fo matio : https://hillc este e gy.tech/
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[1]Hillc est-T ue-ZVS-A ticle-Nov-24-2025.pdf
