Prof. Sam Ben-Yaakov in his video explains coupled inductor filter known as “ripple steering filter” and in practical simulation he shows its benefits and limitations.
With the increasing market for electrified vehicles (EVs), the demand for onboard chargers (OBCs) is growing fast. OBCs open up the possibility to charge the car at fast-charging DC stations and with AC sources in a reasonable time. Such systems are currently going up to 22 kW with operating voltages up to 800 V.
Linear voltage regulators have one major drawback: The voltage dropped across the pass transistor multiplied by the load current equals wasted power. The option is a switch-mode DC/DC converter.
Capacitors are naturally limited by its capability to handle/dissipate ripple current and pulse energy load. The limitation may be significantly different by each capacitor technology but also within a specific product type individual series.
New series of miniature snap-in power aluminium electrolytic capacitors that enables higher power density designs. The Vishay BCcomponents 257 PRM-SI series offers up to 20 % higher ripple current than previous-generation solutions in case sizes that are up to 20 % smaller while providing longer useful life to 5,000 hours at 85 °C.
TDK Corporation presents the new EPCOS aluminum electrolytic capacitor series B43548* with snap-in terminals. The capacitors feature an excellent maximum ripple current capability of 9.80 A (400 V, 100 Hz, 60 °C). This makes them ideal for demanding applications in power electronics.
Switching DC-DCs regulate the output voltage based on energy flow into and from the DC-DC by controlling the duty cycle of the on and off states. When the switch is conducting, energy flows from the input source into the converter and in the case of a buck, some of this gets stored in the inductor as magnetic energy (0.5*LI2) while some gets delivered directly to the output (forward topology).
The video shows how Kemet’s KC-LINK capacitors are tested for ripple current rating and ESR. These surface mount capacitors are designed to meet the growing demand for fast-switching wide bandgap (WBG) semiconductors that operate at higher voltages, temperatures, and frequencies.