Alcatel

Jose Andres Navas Sabater

Mercedes Rivas Saiz

Miguel Rascon Martinez

Antonio Julian Huertas Blazquez

Juan Martin Ramos

Fernando Nuno Garcia

Jos&eacute; Antonio Cobos Marquez

Pedro Alou Cervera

Javier Uceda Antolin

Jaime De La Pe&ntilde;a Llerandi

Roberto Prieto Lopez

Juan Diez Gonzalez

Miguel Jose Prieto

A piezoelectric transformer converts a first voltage, supplied from a voltage source, into a second, different, stabilized voltage by a DC/AC converter followed by a rectifier connected in cascade to a filter. The DC/AC converter block includes a driver block followed by the piezoelectric transformer, such that the driver block feeds the piezoelectric transformer with a pulse train ( ) the frequency of which coincides with the switching frequency (F ) of switching elements included in the driver block. The switching frequency (F ) is less than a resonant frequency (FR) of the piezoelectric transformer; for example, the switching frequency is a sub-harmonic of the resonant frequency (FR).

Switched power supply converter with a piezoelectric transformer

Switched power converter utilizing a piezoelectric transformer

Universal switched power converter having a transformer that comprises a first winding ( - ) divided into two parts and having an intermediate tap ( - - ), and a second winding ( - ) connected in cascade with rectifier means ( ) and filter means ( ), so that a first current flows through the part of said first winding ( - ) comprised between the end of the primary winding ( - ) connected to a first input terminal ( - ) and the intermediate tap ( - - ) and through a second switching element ( - ) connected to the intermediate tap ( - - ) and to a second input terminal ( - ), when the input voltage applied across the input terminals ( - - ) is close to a first predetermined voltage value and the second switching element ( - ) is in a conducting state.

Transformation circuit for universal switched power converter

Resonant switched power converter in which the end of a resonant period coincides with the start of a conducting period of a first switching element, undesirable dead times being avoided during the operation of a self-excited synchronous rectifier. To achieve this, a first capacitor is added which has the characteristic that its capacitance is a function of the duty cycle of the first switching element. The variation in the value of the capacitance of the first capacitor is implemented by adding in parallel thereto a serial combination of a second capacitor and a second switching element. The value of the capacitance varies between a first value and a second value.

Resonant switched power converter

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Madrid, Spain

Jose Andres Navas Sabater