公开(公告)号：US20250038670A1

公开(公告)日：2025-01-30

申请号：US18225955

申请日：2023-07-25

Applicant: STMicroelectronics International N.V.

Inventor： Stefano PERROTTA ,  Salvatore Giuseppe PRIVITERA ,  Francesco PULVIRENTI

IPC: H02M3/335 ,  H02M1/00

Abstract: A DC-DC converter includes a primary-side control-circuit having an oscillator driving a transformer in response to assertion of a PWM-signal to transmit power from the primary to the secondary and ceasing in response to deassertion of the PWM-signal, and a receiver demodulator circuit receiving/demodulating a feedback signal sent from the secondary to the primary by comparing an instantaneous value of an envelope indicative of voltages at the primary-coil to an average-value of the envelope to produce a reset-signal. A PWM circuit asserts the PWM-signal in response to a set-signal and deasserts the PWM-signal in response to assertion of the reset-signal. A secondary-side control-circuit rectifies the received power, asserts an intermediate feedback-signal if feedback indicative of the output voltage is greater than a reference-voltage, and connects a capacitance between the secondary and ground in response to assertion of the intermediate feedback-signal to modulate and send the feedback to the primary.