公开(公告)号：US11552573B1

公开(公告)日：2023-01-10

申请号：US17523651

申请日：2021-11-10

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Francesco Ferrazza

IPC: H02M3/335 ,  H02M1/08

Abstract: In an embodiment, a method for operating an ACF converter includes: turning on a low-side transistor that is coupled between a primary winding of a transformer and a reference terminal to cause a forward current to enter the primary winding, turning off the low-side transistor; after turning off the low-side transistor, turning on a high-side transistor that is coupled between the primary winding and a clamp capacitor to cause a reverse current to flow through the primary winding; and after turning on the high-side transistor, when an overcurrent of the reverse current is not detected, keeping the high-side transistor on for a first period of time, and turning off the high-side transistor after the first period of time, and when the overcurrent of the reverse current is detected, turning off the high-side transistor without keeping the high-side transistor on for the first period of time.

公开(公告)号：US11329568B2

公开(公告)日：2022-05-10

申请号：US16933534

申请日：2020-07-20

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Giuseppe Gattavari ,  Paolo Mattavelli ,  Enrico Orietti ,  Giorgio Spiazzi

IPC: H02M3/335

Abstract: A PWM controlled multi-phase resonant voltage converter may include a plurality of primary windings powered through respective half-bridges, and as many secondary windings connected to an output terminal of the converter and magnetically coupled to the respective primary windings. The primary or secondary windings may be connected such that a real or virtual neutral point is floating.

公开(公告)号：US20210226527A1

公开(公告)日：2021-07-22

申请号：US17151397

申请日：2021-01-18

Applicant: STMicroelectronics S.r.l.

Inventor： Alfio Pasqua ,  Salvatore Tumminaro ,  Marco Sammartano ,  Claudio Adragna

IPC: H02M1/42

Abstract: An embodiment PFC control circuit comprises a first terminal providing a drive signal to an electronic switch of a boost converter, a second terminal receiving a feedback signal indicative of an output voltage generated by the boost converter, and a third terminal connected to a compensation network. An error amplifier generates a current as a function of the voltage at the second terminal and a reference voltage, wherein an output of the error amplifier is coupled to the third terminal. A driver circuit generates the drive signal as a function of the voltage at the third terminal, and selectively activates or deactivates the generation of the drive signal as a function of a burst mode enable signal. A detection circuit generates the burst mode enable signal as a function of the voltage at the second terminal.

公开(公告)号：US20190109543A1

公开(公告)日：2019-04-11

申请号：US16211619

申请日：2018-12-06

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Giuseppe Gattavari ,  Paolo Mattavelli ,  Enrico Orietti ,  Giorgio Spiazzi

IPC: H02M3/335

Abstract: A PWM controlled multi-phase resonant voltage converter may include a plurality of primary windings powered through respective half-bridges, and as many secondary windings connected to an output terminal of the converter and magnetically coupled to the respective primary windings. The primary or secondary windings may be connected such that a real or virtual neutral point is floating.

公开(公告)号：US10243470B2

公开(公告)日：2019-03-26

申请号：US15915758

申请日：2018-03-08

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna

IPC: H02M3/335 ,  H02M3/157 ,  H02M1/08 ,  H03F3/45 ,  H03K17/687 ,  H02M7/523 ,  H02M1/00

Abstract: A control circuit for an electronic converter having a power stage controls the operation of a power stage as a function of a feedback control signal that indicates an input power provided to the power stage. The control circuit generates a digital reference signal as a function of the feedback control signal and a first signal based on an input voltage supplied to the power stage. The control circuit generates a modified control signal as a function of the digital reference signal and a second signal based on an input current supplied to the power stage.

公开(公告)号：US10128761B2

公开(公告)日：2018-11-13

申请号：US15261340

申请日：2016-09-09

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: G05F1/10 ,  H02M3/335 ,  H02M1/08 ,  H02M1/12 ,  H02M1/42 ,  H05B33/08

Abstract: The present disclosure is directed to a primary-controlled high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs, and may be compatible with phase-cut dimmers. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.

公开(公告)号：US09973095B2

公开(公告)日：2018-05-15

申请号：US15344288

申请日：2016-11-04

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Claudio Adragna ,  Giovanni Gritti

IPC: H02M1/08 ,  H02M3/335 ,  H02M1/36 ,  H02M1/32 ,  H02M1/00

CPC classification number: H02M3/33523 ,  H02M1/08 ,  H02M1/32 ,  H02M1/36 ,  H02M1/42 ,  H02M1/4258 ,  H02M2001/0009 ,  H02M2001/0058

Abstract: The present disclosure is directed to a high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a sinusoidal reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.

公开(公告)号：US20180048239A1

公开(公告)日：2018-02-15

申请号：US15722398

申请日：2017-10-02

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Giovanni Gritti

IPC: H02M3/335 ,  H02M1/32 ,  H02M1/36 ,  H02M1/08 ,  H02M1/00

CPC classification number: H02M3/33523 ,  H02M1/08 ,  H02M1/32 ,  H02M1/36 ,  H02M1/42 ,  H02M1/4258 ,  H02M2001/0009 ,  H02M2001/0058 ,  Y02B70/126 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: The present disclosure is directed to a high power factor quasi resonant converter. The converter converts an AC power line input to a DC output to power a load, generally a string of LEDs. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. The shaping circuit uses a current generator, switched resistor and capacitor to produce a sinusoidal reference voltage signal. The controller drives the power switch based on the voltage reference signal, resulting in a sinusoidal input current in a primary winding of the transformer, resulting in high power factor and low total harmonic distortion for the converter.

公开(公告)号：US20180004240A1

公开(公告)日：2018-01-04

申请号：US15383844

申请日：2016-12-19

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: G05F3/26 ,  H02M3/335 ,  H02M1/42

CPC classification number: G02B26/0833 ,  B81B3/0045 ,  B81B2201/042 ,  B81B2203/0315 ,  B81B2203/056 ,  G05F3/26 ,  H02M1/12 ,  H02M1/15 ,  H02M1/42 ,  H02M1/4225 ,  H02M1/4258 ,  H02M3/33507 ,  H02M2001/0025 ,  H02M2001/0032 ,  H04N9/3155 ,  H04N9/3173 ,  Y02B70/126 ,  Y02B70/16 ,  Y02P80/112

Abstract: A control device for controlling a switching converter includes a switch controller that generates a control signal with a switching period for controlling switching of a switch of the switching converter and setting a first interval in which a current flows in the switch, a second interval in which energy is transferred onto a storage element of the switching converter, and a third, wait, interval, at the end of the second interval. The duration of the first interval is determined based on a control voltage indicating the output voltage. A pre-distortion stage receives the control voltage and generates a pre-distorted control voltage as a function of the control voltage and a relationship between one of the first and third time intervals and the switching period, wherein the switch controller is configured to control a duration of the first interval based on the pre-distorted control voltage.

公开(公告)号：US20170317597A1

公开(公告)日：2017-11-02

申请号：US15653145

申请日：2017-07-18

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Aldo Vittorio Novelli ,  Christian Leone Santoro

IPC: H02M3/335 ,  H02M3/337 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M3/3376 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491 ,  Y02P80/112

Abstract: A circuit includes a timer circuit configured to generate a first control signal defining a first time period and a second control signal defining a second time period. A controller is configured to control a high-side and a low-side transistor of a half-bridge circuit in response to the first and second control signals only during a first switching cycle of the half-bridge circuit. The half-bridge circuit includes a bootstrap capacitor coupled to a node between the high-side and low-side transistors. The controller turns on the low-side transistor for the first time period during the first switching cycle and configured turns off the low-side and the high-side transistors for the second time period during the first switching cycle.