## High Bandwidth AC and DC Converter

A power converter optimized for a very high bandwidth output voltage modulation and for the delivery of very high bandwidth output current must be differently structured and optimized from one delivering only or mostly DC quantities. Exceptionally taxing is the design which has to deliver

**Some AC voltage and AC current source requirements are exactly contradictory. High frequency currents can be easily sourced by decoupling output with a sufficient bank of capacitors but this will create an unacceptable load with high frequency voltage modulation. And similarly a very high frequency voltage can be conveniently decoupled with inductance but this inductance will block a high frequency current. The converter for delivering DC voltage or DC current while the other quantity is AC is relatively easy to realize through the use of appropriate passive filters and control methods. It will then be beneficial to split the energy processing of a very high bandwidth voltage and current modulators into 3 parts: AC voltage/AC current, AC voltage/DC current and DC voltage/AC current. DC voltage/DC current is the easiest component that can be delivered by any AC/DC part or the fourth converter. This type of division allows us to optimize all 3 subconverters according to the load conditions they are exposed to and thus optimize the overall efficiency, cost, size, reliability, etc****simultaneously**very high bandwidth voltages AND currents in the presence of significant DC components.