Capacitors in telecommunication systems power conversion: a 100 W high frequency DC-DC converter without wet electrolytic capacitor

The technical feasibility of a converter without a wet electrolytic capacitor is demonstrated. The authors set out the actions undertaken to ensure that chemical capacitors in DC-DC converters are correctly used. They give the progression of study and realization, on the basis of a defined specification, of a 100 W high-frequency DC-DC converter, designed without a wet electrolytic capacitor. The different structures of resonant converters are analyzed to accept a forward zero voltage switching multiresonance converter working in a variable frequency between 800 kHz and 1.2 MHz. This converter allows and imposes the use of capacitors whose characteristics are described. >