公开(公告)号：US12040722B2

公开(公告)日：2024-07-16

申请号：US17523561

申请日：2021-11-10

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33592 ,  H02M1/08

Abstract: In an embodiment, a method for controlling a synchronous rectifier (SR) transistor of a flyback converter includes: determining a first voltage across conduction terminals of the SR transistor; asserting a turn-on signal when a body diode of the SR transistor is conducting current; asserting a turn-off signal when current flowing through the conduction terminals of the SR transistor decreases below a first threshold; generating a gating signal based on an output voltage of the flyback converter and on the first voltage; turning on the SR transistor based on the turn-on signal and on the gating signal; and turning off the SR transistor based on the turn-off signal.

公开(公告)号：US11825571B2

公开(公告)日：2023-11-21

申请号：US18151191

申请日：2023-01-06

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: H05B45/10 ,  H02M1/42 ,  H05B45/385

CPC classification number: H05B45/10 ,  H02M1/4225 ,  H02M1/4258 ,  H05B45/385

Abstract: A control circuit includes an output terminal configured to be coupled to a control terminal of a transistor that has a current path coupled to an inductor; a transconductance amplifier configured to produce a sense current based on a current flowing through the current path of the transistor; and a first capacitor. The control circuit is configured to turn on the transistor based on a clock signal, integrate the sense current with an integrating capacitor to generate a first voltage, generate a second voltage across the first capacitor based on a first current, generate a second current based on the second voltage, generate a third voltage based on the second current, turn off the transistor when the first voltage becomes higher than the third voltage; discharge the integrating capacitor when the transistor turns off; and regulate an average output current flowing through the inductor based on the first current.

公开(公告)号：US11387739B2

公开(公告)日：2022-07-12

申请号：US17006022

申请日：2020-08-28

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna

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

Abstract: A driver circuit for a resonant converter includes a comparator that generates a first control signal indicating when a resonant current changes sign. A first ramp generator circuit outputs a first ramp signal, and a comparison circuit determines whether the first ramp signal reaches a reference threshold. The driver circuit drives a half-bridge via drive signals during consecutive first second switching semi-periods, each of which ends when the comparison circuit indicates the first ramp signal has reached a reference threshold. A control circuit generates in each of the first and the second switching semi-periods control signals indicating a first interval and a second interval. A correction circuit modifies the first ramp signal to have a first gradient value during the first interval and a second gradient value during the second interval. Alternatively, the correction circuit modifies a reference threshold by adding a second ramp signal to an initial threshold value.

公开(公告)号：US10389223B1

公开(公告)日：2019-08-20

申请号：US16230013

申请日：2018-12-21

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Alberto Bianco ,  Claudio Adragna

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

Abstract: A method and controller for controlling a converter are provided. The converter is operated in a first phase in which controller logic asserts a first gate drive signal to cause a first transistor of the converter to be conductive and deasserts a second gate drive signal to cause a second transistor of the converter to be non-conductive. In a first deadtime phase and a second phase, the controller logic deasserts both the first and second gate drive signals to cause leakage energy from a leakage inductance of a primary winding of the converter to be transferred to a clamp capacitance of the converter. After the leakage energy is transferred, the converter is operated in a third phase in which the logic asserts the second gate drive signal and deasserts the first gate drive signal.

公开(公告)号：US10241322B2

公开(公告)日：2019-03-26

申请号：US15383844

申请日：2016-12-19

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: H02M3/335 ,  G02B26/08 ,  H02M1/12 ,  H02M1/15 ,  B81B3/00 ,  H04N9/31 ,  G05F3/26 ,  H02M1/42 ,  H02M1/00

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：US10181796B2

公开(公告)日：2019-01-15

申请号：US15722398

申请日：2017-10-02

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Giovanni Gritti

IPC: H02M3/335 ,  H02M1/42 ,  H02M1/08 ,  H02M1/32 ,  H02M1/36 ,  H02M1/00

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：US20180278151A1

公开(公告)日：2018-09-27

申请号：US15913423

申请日：2018-03-06

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: H02M1/42

CPC classification number: H02M1/4225 ,  H02M3/156 ,  H02M2001/0025 ,  Y02B70/126

Abstract: A control unit for a switching converter has an inductor element coupled to an input and a switch element coupled to the inductor element. The control unit generates a command signal with a switching period to control the switching of the switch element and to determine a first time period where an inductor current is flowing in the inductor element for storing energy and a second time period where energy is transferred to a load. The second time period has an end portion where the inductor current drops to zero. The control unit determines the duration of the first time period based on a comparison between a sensing voltage, indicative of the peak value of the inductor current, and a reference voltage. A pre-distortion stage pre-distorts the reference voltage in order to compensate for a corresponding distortion on an input current of the converter compared to a desired sinusoidal characteristic.

公开(公告)号：US09698688B2

公开(公告)日：2017-07-04

申请号：US14846389

申请日：2015-09-04

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Claudio Spini ,  Aldo Vittorio Novelli ,  Fabrizio Bognanni

IPC: H02M3/335 ,  H02M3/158 ,  H02M3/337 ,  H02M1/00

CPC classification number: H02M3/158 ,  H02M3/33507 ,  H02M3/3376 ,  H02M2001/0035 ,  Y02B70/1433 ,  Y02B70/16

Abstract: An effective method enhances energy saving at low load in a resonant converter with a hysteretic control scheme for implementing burst-mode at light load. The method causes a current controlled oscillator of the converter to stop oscillating when a feedback control current of the output voltage of the converter reaches a first threshold value, and introduces a nonlinearity in the functional relation between the frequency of oscillation and said feedback control current or in a derivative of the functional relation, while the control current is between a lower, second threshold value and the first threshold value, such that the frequency of oscillation remains equal or smaller than the frequency of oscillation when the control current is equal to the second threshold value. Several circuital implementations are illustrated, all of simple realization without requiring any costly microcontroller.

公开(公告)号：US09455636B2

公开(公告)日：2016-09-27

申请号：US14572627

申请日：2014-12-16

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: G05F1/10 ,  H02M3/335

CPC classification number: H02M3/33507 ,  H02M1/08 ,  H02M1/12 ,  H02M1/4241 ,  H05B33/0815 ,  H05B33/0845 ,  Y02B70/126 ,  Y02B70/1433

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.

Abstract translation: 本公开涉及初级控制的高功率因数准谐振转换器。 转换器将交流电源线输入转换为直流输出以为负载（通常为一串LED）供电，并且可能与相位调制器兼容。 电源输入馈送到由电源开关控制的变压器中。 电源开关由具有整形电路的控制器驱动。 整形电路使用电流发生器，开关电阻和电容器来产生参考电压信号。 控制器根据电压参考信号驱动电源开关，导致变压器初级绕组中的正弦输入电流，导致转换器的功率因数高，总谐波失真低。

公开(公告)号：US20160261199A1

公开(公告)日：2016-09-08

申请号：US14572638

申请日：2015-03-06

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Claudio Adragna ,  Giovanni Gritti

IPC: H02M3/335 ,  H02M1/42

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.

Abstract translation: 本公开涉及一种高功率因数准谐振转换器。 转换器将交流电源线输入转换为直流输出，为负载（通常为一串LED）供电。 电源输入馈送到由电源开关控制的变压器中。 电源开关由具有整形电路的控制器驱动。 整形电路使用电流发生器，开关电阻和电容器来产生正弦参考电压信号。 控制器根据电压参考信号驱动电源开关，导致变压器初级绕组中的正弦输入电流，导致转换器的功率因数高，总谐波失真低。