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.

公开(公告)号：US09780673B2

公开(公告)日：2017-10-03

申请号：US14157244

申请日：2014-01-16

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: A control device for controlling a switching power supply adapted to convert an input voltage into an output voltage according to a switching rate of a switching element. The control device includes first control means for switching the switching element in a first working mode at a constant frequency and second control means for switching the switching element in a second working mode at a variable frequency, under a maximum frequency, in response to the detection of a predefined operative condition of the switching power supply. The control device further includes means for selecting the first working mode or the second working mode.

公开(公告)号：US20170179845A1

公开(公告)日：2017-06-22

申请号：US15452173

申请日：2017-03-07

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Claudio Adragna

IPC: H02M7/06 ,  H02M1/08 ,  H02M1/42

Abstract: A control device controls a switching converter having an input alternating supply voltage and a regulated direct voltage at the output terminal. The converter comprises a switch and the control device is adapted to control the on time period and the off time period of said switch for each cycle. The control device has a first input signal representative of the current flowing through at least one element of the converter and comprises a zero crossing detector adapted to detect at least one pair of first and second zero crossings of said first signal for each switching cycle, said second zero crossing immediately following the first zero crossing and occurring in opposite direction with respect to the first zero crossing. The control device comprises a synchronizer adapted to synchronize the start of the on period with each second zero crossing of said first signal.

公开(公告)号：US20170063242A1

公开(公告)日：2017-03-02

申请号：US15261340

申请日：2016-09-09

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: H02M3/335 ,  H05B33/08

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：US09397573B2

公开(公告)日：2016-07-19

申请号：US13666853

申请日：2012-11-01

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Spini ,  Claudio Adragna

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/33515 ,  H02M3/33553

Abstract: An integrated control circuit of a switch is described, which is adapted to open or close a current path; said integrated circuit includes a comparator to compare a first signal with a second signal representative of the current flowing through said current path. The comparator outputs a third variable signal between a low logic level and a high logic level according to whether said second signal is lower than said first signal or vice versa; the integrated circuit has a driver to generate a signal to drive said switch in response to the third signal, and is configured to detect a spike on the leading edge of said second signal and to blank said third signal for a first blanking time period which depends on a turn-on delay of said switch and a second blanking period which depends on the duration of said spike on the leading edge of said second signal.

Abstract translation: 描述了开关的集成控制电路，其适于打开或关闭电流路径; 所述集成电路包括比较器，用于将第一信号与表示流过所述电流路径的电流的第二信号进行比较。 所述比较器根据所述第二信号是否低于所述第一信号而输出低逻辑电平和高逻辑电平之间的第三可变信号，反之亦然; 所述集成电路具有驱动器，以产生响应于所述第三信号来驱动所述开关的信号，并且被配置为检测所述第二信号的前沿上的尖峰，并且将所述第三信号置为空白，所述第一消隐时间段取决于 在所述开关的导通延迟上，以及取决于所述第二信号的前沿上的所述尖峰的持续时间的第二消隐周期。

公开(公告)号：US09154030B2

公开(公告)日：2015-10-06

申请号：US13749539

申请日：2013-01-24

Applicant: DORA S.p.A. ,  STMicroelectronics S.r.l.

Inventor： Alberto Bianco ,  Claudio Adragna

IPC: H02M3/156 ,  H02M1/42 ,  H02M3/157

CPC classification number: H02M3/156 ,  H02M1/4225 ,  H02M3/157 ,  Y02B70/126

Abstract: A control device controls a switching converter. The converter has an input alternating supply voltage, a regulated direct voltage on the output terminal, and a switch connected to an inductor. The control device controls the closing and opening time period of said switch for each cycle and receives a first input signal representative of the current flowing through one element of the converter. The control device comprises a counter configured to count a time period, a comparator configured to compare said first input signal with a second signal, digital control block configured to control the closing and opening of said switch and to activate said counter to start the counting of said time period when the said first input signal crosses said second signal, with said switch being closed. The digital control block is configured to open the switch when the counter finishes the counting of said time period.

Abstract translation: 控制装置控制开关转换器。 转换器具有输入交流电源电压，输出端子上的稳压直流电压和连接到电感器的开关。 控制装置控制每个周期的所述开关的闭合和打开时间周期，并且接收表示流过转换器的一个元件的电流的第一输入信号。 控制装置包括配置成对时间段进行计数的计数器，被配置为将所述第一输入信号与第二信号进行比较的比较器，被配置为控制所述开关的关闭和打开的数字控制块，并激活所述计数器以开始计数 所述时间段，当所述第一输入信号与所述第二信号相交时，所述开关闭合。 数字控制块被配置为当计数器完成所述时间段的计数时打开开关。