公开(公告)号：US20210376735A1

公开(公告)日：2021-12-02

申请号：US17404382

申请日：2021-08-17

Applicant: STMicroelectronics S.r.l.

Inventor： Alessandro PARISI ,  Nunzio GRECO ,  Nunzio SPINA ,  Egidio RAGONESE ,  Giuseppe PALMISANO

IPC: H02M3/335 ,  H02M1/08 ,  H04L27/08 ,  H01F19/08 ,  H01F27/28 ,  H03B5/12 ,  H02M3/338 ,  H02M3/337

Abstract: A DC-DC converter includes: an transformer having a primary winding and a secondary winding magnetically coupled to the primary winding; a power oscillator applying an oscillating signal to the primary to transmit a power signal to the secondary winding; a rectifier connected to the secondary winding of the transformer to obtain an output DC voltage by rectification of the power signal; comparison circuitry to generate an error signal representing a difference between the output DC voltage and a reference voltage; a transmitter connected to the secondary winding of the transformer to apply an amplitude modulation to the power signal at the secondary winding of the transformer in response to the error signal to thereby produce an amplitude modulated signal at the primary winding; and a receiver and control circuit connected to the primary winding to control an amplitude of the oscillating signal as a function of the amplitude modulated signal.

公开(公告)号：US20200161980A1

公开(公告)日：2020-05-21

申请号：US16748328

申请日：2020-01-21

Applicant: STMicroelectronics S.r.l.

Inventor： Alessandro PARISI ,  Nunzio GRECO ,  Nunzio SPINA ,  Egidio RAGONESE ,  Giuseppe PALMISANO

IPC: H02M3/335 ,  H02M3/337 ,  H02M3/338 ,  H03B5/12 ,  H01F27/28 ,  H01F19/08 ,  H04L27/08 ,  H02M1/08

Abstract: A DC-DC converter includes a transformer having primary and secondary windings, a power oscillator applying an oscillating signal to the primary winding to transmit a power signal to the secondary winding, a rectifier obtaining an output DC voltage by rectifying the power signal at the secondary winding, and comparison circuitry generating an error signal representing a difference between the output DC voltage and a reference voltage value. A transmitter connected to the secondary winding performs an amplitude modulation of the power signal at the secondary winding to transmit an amplitude modulated power signal to the primary winding, the amplitude modulation based upon the error signal and modulating a stream of data to the primary winding. A receiver coupled to the primary winding demodulates the amplitude modulated power signal to recover the error signal and the stream of data. An amplitude of the oscillating signal is controlled by the error signal.

公开(公告)号：US20190305775A1

公开(公告)日：2019-10-03

申请号：US16371919

申请日：2019-04-01

Applicant: STMicroelectronics S.r.l.

Inventor： Alessandro PARISI ,  Nunzio GRECO ,  Nunzio SPINA ,  Egidio RAGONESE ,  Giuseppe PALMISANO

IPC: H03K17/722 ,  H03B5/06

Abstract: An oscillator is coupled to a first side of a galvanic barrier for supplying thereto an electric supply signal. The oscillator is configured to be alternatively turned on and off as a function of a PWM drive signal applied thereto. A receiver circuit coupled to the galvanic barrier receives therefrom a PWM power control signal. A signal reconstruction circuit coupled between the receiver circuit block and the oscillator provides to the oscillator a PWM drive signal reconstructed from the PWM power control signal. The signal reconstruction circuit includes a PLL circuit coupled to the receiver circuit block and configured to lock to the PWM control signal from the receiver circuit block. A PLL loop within the PLL circuit is sensitive to the PWM drive signal applied to the oscillator. The PLL loop is configured to be opened as a result of the power supply oscillator being turned off.