Power Factor

Wise Integration has released its GaN PFC (power factor correction) controller chip to production. WIW1101 is based on a 32bit MCU, said the company, and is specifically for totem pole PFCs operating in critical conduction mode (CrCM), switching at up to 2MHz and delivering between 100W and 1.5kW. Its proprietary internal algorithm “enables ZVS [zero voltage switching] across all power ...

TDK-Lambda has introduced a full brick power factor correction module capable of offering the input ac a 0.98 power factor while providing up to 1.5kW at a regulated (non-isolated) 360Vdc. Called PF1500B-360, it delivers that power with inputs from 170 to 265Vac, while 1kW is available when operating down to 85Vac. Input and output to base-plate isolation is 2.5kVac. Efficiency ...

Onsemi has announced three silicon carbide power modules for 800V 11 – 22kW on-board charging and high-voltage dc-dc converiosn in electric vehicles  – all in transfer moulded packaging, claimed to be a first. “Our modules employ the latest SiC technology to minimise losses and overall system volume, allowing designers to meet charging efficiency and space goals,”, claimed Onsemi general manager ...

Cambridge-based start-up Pulsiv is aiming to replace LLC front-ends in ac-dc power supplies with a proprietary design which “can be combined with commodity fly-back DC-DC converters to displace higher-cost LLC solutions”, it claims. According to the company, it has demonstrated a universal input single-switch 150W fly-back power supply design that delivers 97.5% average (99.5% peak, graph below) front-end efficiency while ...

Rohm has developed its 4th generation 650V fast recovery diodes (FRDs), balancing forward voltage and reverse-recovery time for high-power industrial and consumer equipment including air conditioners and electric vehicle charging stations. RFL series (right) is nominally low forward voltage and reduces Vf by ~3.2% and trr by ~8.3% compared with the existing RFN series. RFS series (right), nominally high-speed, reduces ...

Power Integrations is aiming at 135W USB-C power delivery adapters using a zero-voltage switching fly-back converter IC and partner primary-side active-clamp IC. “The use of a non-complementary-mode active clamp enables designs that work in both continuous and discontinuous modes,” said company marketing manager Edward Ong”. “By operating across modes, it is much easier to support the wide load range conditions ...

TDK has created two series of capacitors specifically for power factor correction (PFC). Jointly-branded PhaseCap Energy Plus, the series are: B25674C – gas-impregnated, 230 to 690Vac, 5 to 33.1kvar compensation B25675C – biodegradable resin impregnated, 230 to 1,000Vac, up to 60kvar compensation Lifetime is up to 240,000 hours in temperature class -40/D, the terminals are class IP20 touch-proof, and ceramic-based discharge resistors ...

Onsemi has announced an interleaved, two-phase power factor correction controller for ‘bridge-less’ totem pole topologies from 350W to several kW of 90 – 265Vac mains input. Interleaving parallels multiple small stages, allowing more numerous smaller component to be used, distributing heat, reducing ripple amplitude and potentially lowering EMI. “Also, interleaving extends the power range of critical conduction mode that is ...

Alpha and Omega Semiconductor has announced a series of super-junction power mosfets. Branded αMOS5, its first members are both 600V 250A transistors in TO-247 packaging: the 40mΩ AOK040A60, and the 42mΩ AOK042A60FD ‘fast body diode’ device – reverse recovery is typically 252ns (25A, 100A/μs, 400V) compared with 525ns in the 40mΩ part. “The optimised capacitance of the 40mΩ product will provide customers the ...

ON Semiconductor is introducing a critical conduction mode ‘bridge-less*’ totem-pole PFC (power factor correction) controller, claiming it to be industry’s first dedicated IC. Called NCP1680, at its heart is an internally compensated digital loop control implementing a constant on-time CCM architecture with valley switching. “Modern efficiency standards, including those that require high efficiency at light load, can also be met due ...