It does this through the combination of PFC power supplies, for efficient AC-DC conversion of high power from three-phase 400 VAC, plus insulated DC-DC converters that ensure both elevated efficiency and bidirectional operation. This application example intends to promote the widespread use of high-speed, low loss EV charging stations. Furthermore, if there needs to be scope for the EV battery to potentially be used as a power source for other tasks, then bidirectional DC-DC converters will clearly prove useful. Incremental encoders with high transistor logic (HTL) output generate the output signal using two transistors in a totem-pole configuration. The use of three-phase 400 VAC as input power requires a power factor corrected (PFC) power source for AC-DC conversion plus a highly efficient insulated DC-DC conversion mechanism for supplying power to the EV battery charging circuit from the DC output of PFC with minimal losses. Incremental encoders can provide any of several types of digital output signals, but the two most common are high transistor logic (HTL) and and transistor-transistor logic (TTL). It is a system that permits bidirectional charging by converting 3-phase 400 VAC to DC with a high efficiency PFC power supply and combining it with bidirectional DC-DC converter(introduced in the following article). Here is an example application that uses this reference design.
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