Stmicroelectronics S.r.l.

Qualcomm Incorporated

Claudio Cantoro

Mirko Gravati

Francesco Piazza

A control device for a resonant converter is described. The converter comprises a switching circuit adapted to drive a resonant circuit that includes at least one capacitor. The converter is adapted to convert an input signal into an output signal and the switching circuit includes at least a half bridge of first and second switches, the central point of said half bridge being connected to the resonant circuit. The control device comprises a controller adapted to generate at least a control signal of the switching circuit by comparing a signal representative of the energy of the resonant circuit with at least another signal.

Control device for a resonant converter

A peak detector circuit receives an oscillating power supply signal. A capacitor is selectably coupled to the signal and charged to a value corresponding to a peak value of the signal. A switch is then opened to isolate the capacitor. A comparator continually compares the signal with the value stored on the capacitor. When the signal rises to within a selected threshold, relative to the stored value, the comparator produces a command signal to close the switch, again coupling the capacitor to the signal. The peak detector can also include a tracking circuit that controls the capacitor to track the oscillating signal while the switch is closed, a timer circuit configured to close the switch and activate the tracking circuit if more than a selected time passes without production of a command signal, and a circuit configured to control the polarity of a leakage current of the capacitor.

Peak voltage detector and related method of generating an envelope voltage

An apparatus to control a tuneable Gm-C filter, including and a filter that can be reconfigured as a free running oscillator by toggling the feedback sign of an output amplifier (), a digital controller (), sensitive to the output of the filter in the calibration configuration, and a DAC () to provide an analogue control signal () to the gm inputs of the transconductance amplifiers () composing the filter.

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Cornaredo, Italy

Claudio Cantoro