公开(公告)号：US20130293267A1

公开(公告)日：2013-11-07

申请号：US13888180

申请日：2013-05-06

Applicant: STMICROELECTRONICS S.R.L.

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

IPC: H03K17/082

CPC classification number: H03K17/082 ,  H02M1/32 ,  H02M1/36 ,  H02M1/38 ,  H02M3/3382 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A control device of a switching circuit of a resonant apparatus is described. The switching circuit comprises at least one half-bridge having a high-side transistor and a low-side transistor connected between an input voltage and a reference voltage; the resonant apparatus comprises a resonant load. The control device is configured to determine the on time period and the off time period of the transistors alternatively and a dead time of both the transistors so that a periodic square-wave voltage is applied to the resonant load. The control device comprises a detector adapted to detect the current sign flowing through the resonant load and a correction circuit configured to extend the current operating time period of said two transistors in response to at least the current sign detected from the detection means.

Abstract translation: 描述谐振装置的开关电路的控制装置。 开关电路包括具有连接在输入电压和参考电压之间的高侧晶体管和低侧晶体管的至少一个半桥; 谐振装置包括谐振负载。 控制装置被配置为确定晶体管的导通时间段和关闭时间段以及两个晶体管的死区时间，使得周期性方波电压被施加到谐振负载。 控制装置包括检测器，其适于检测流过谐振负载的电流符号，以及校正电路，其被配置为响应于至少从检测装置检测到的电流符号来扩展所述两个晶体管的当前工作时间段。

公开(公告)号：US11622429B1

公开(公告)日：2023-04-04

申请号：US17487966

申请日：2021-09-28

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Giovanni Gritti

IPC: H05B45/375

Abstract: In an embodiment, a control circuit includes: an output terminal configured to be coupled to a control terminal of a transistor that is coupled to an inductor; a logic circuit configured to control the transistor using a first signal; a zero crossing detection circuit configured to generate a freewheeling signal indicative of a demagnetization of the inductor; a comparator having first and second inputs configured to receive a sense voltage indicative of a current flowing through the transistor and a reference voltage, respectively, and an output configured to cause the logic circuit to deassert the first signal; and a reference generator configured to generate the reference voltage and including: a current generator, a capacitor and a resistor coupled to the output of the reference generator, and a switch coupled in series with the resistor and configured to be controlled based on the first signal and the freewheeling signal.

公开(公告)号：US20230101140A1

公开(公告)日：2023-03-30

申请号：US17888214

申请日：2022-08-15

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna ,  Giovanni Gritti

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

Abstract: A control circuit includes: a flip-flop having an output configured to be coupled to a control terminal of a transistor and for producing a first signal; a comparator having an output coupled to an input of the flip-flop, and first and second inputs for receiving first and second voltages, respectively; a transconductance amplifier having an input for receiving a sense voltage indicative of a current flowing through the transistor, and an output coupled to the first input of the comparator; a zero crossing detection (ZCD) circuit having an input configured to be coupled to a first current path terminal of the transistor and to an inductor, where the ZCD circuit is configured to detect a demagnetization time of the inductor and produce a third signal based on the detected demagnetization time; and a reference generator configured to generate the second voltage based on the first and third signals.

公开(公告)号：US20200350826A1

公开(公告)日：2020-11-05

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：US10756637B2

公开(公告)日：2020-08-25

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：US10468991B2

公开(公告)日：2019-11-05

申请号：US16155650

申请日：2018-10-09

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: 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：US10361633B2

公开(公告)日：2019-07-23

申请号：US15664019

申请日：2017-07-31

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Lombardo ,  Claudio Adragna ,  Salvatore Tumminaro

IPC: H02M3/335

Abstract: An integrated circuit includes an output terminal a first input terminal is configured to receive a signal proportional to a voltage between first and second terminals of the primary winding, and a second input terminal is configured to receive a signal proportional to a current flowing through the primary winding. A quasi-resonant (QR) circuit has a first input coupled to the first terminal, and a second input coupled to an output of an oscillator circuit. A selector circuit has a first input coupled to the output of the oscillator circuit, a second input coupled to an output of the QR circuit, and a select input. An output control circuit includes a first input coupled to the second input terminal, a second input coupled to an output of the selector circuit, and an output coupled to a control terminal of the switching transistor.

公开(公告)号：US10298116B2

公开(公告)日：2019-05-21

申请号：US15913423

申请日：2018-03-06

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: H02M1/42 ,  H02M1/00 ,  H02M3/156

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：US10205377B1

公开(公告)日：2019-02-12

申请号：US15948183

申请日：2018-04-09

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：US20170353117A1

公开(公告)日：2017-12-07

申请号：US15664019

申请日：2017-07-31

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Lombardo ,  Claudio Adragna ,  Salvatore Tumminaro

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M3/33507 ,  Y02B70/1433 ,  Y10T307/826

Abstract: An integrated circuit includes an output terminal a first input terminal is configured to receive a signal proportional to a voltage between first and second terminals of the primary winding, and a second input terminal is configured to receive a signal proportional to a current flowing through the primary winding. A quasi-resonant (QR) circuit has a first input coupled to the first terminal, and a second input coupled to an output of an oscillator circuit. A selector circuit has a first input coupled to the output of the oscillator circuit, a second input coupled to an output of the QR circuit, and a select input. An output control circuit includes a first input coupled to the second input terminal, a second input coupled to an output of the selector circuit, and an output coupled to a control terminal of the switching transistor.