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：US20150155776A1

公开(公告)日：2015-06-04

申请号：US14549211

申请日：2014-11-20

Applicant: STMicroelectronics S.r.l.

Inventor： Claudia Castelli ,  Claudio Adragna

IPC: H02M1/42

CPC classification number: H02M1/4208 ,  H02M1/4225 ,  H02M2001/0032 ,  Y02B70/126 ,  Y02B70/16

Abstract: A method controls a power factor correction converter that includes a boost inductor and a switch. The method generates a sense signal representing a rectified AC input voltage or an inductor current through the boost inductor, turns on the switch in response to determining, based on the sense signal, a zero current condition through the boost inductor, turns off the switch after an on-time interval, generates a feedback signal based on an output voltage of the converter, and compares the feedback signal with a threshold. If the feedback signal is smaller than the threshold, the method generates a command signal, representing a phase domain including 0 and π, based on the feedback signal and the power threshold, and keeps the switch off when a phase of the input rectified AC voltage or of the inductor current is in the phase domain even if the zero current condition has been determined.

Abstract translation: 一种方法控制包括升压电感和开关的功率因数校正转换器。 该方法产生表示经过升压电感的整流AC输入电压或电感电流的感测信号，响应于基于感测信号确定通过升压电感器的零电流状态来导通开关，在开关之后关闭开关 导通时间间隔，基于转换器的输出电压产生反馈信号，并将反馈信号与阈值进行比较。 如果反馈信号小于阈值，则该方法基于反馈信号和功率阈值生成表示包括0和＆lt; pgr的相位域的指令信号，并且当输入整流AC的相位保持关闭 即使已经确定零电流条件，电压或电感电流也处于相位域。

公开(公告)号：US20150003117A1

公开(公告)日：2015-01-01

申请号：US14311116

申请日：2014-06-20

Applicant: STMicroelectronics S.r.l.

Inventor： Francesco Ferrazza ,  Ambrogio Giuseppe D'Adda ,  Claudio Adragna

IPC: H02M3/335

CPC classification number: H02M3/33546 ,  H02M1/15 ,  H02M3/335 ,  H02M2001/0035 ,  H02M2001/0054 ,  Y02B70/1433 ,  Y02B70/16

Abstract: A method of controlling a switching converter and a related controller suitable for the switching converter allow to implement a burst-mode functioning without generating acoustic noise and with a relevantly reduced ripple of the regulated DC voltage or current provided in output to a supplied load. The method includes sensing the difference between the error signal and the burst-stop threshold at the beginning of a burst period. If the error signal has surpassed (either upwards or downwards) the burst-stop threshold, the method sets the switching stage in a high impedance state at a new active edge of a clock signal, keeps the switching stage in the high impedance state for an integer number of cycles of the clock signal, and re-enables the switching stage to switch the energy tank circuit up to the end of the burst period. The integer number is determined based on the difference between the error signal and the burst-stop threshold,

Abstract translation: 一种控制开关转换器的方法和适用于开关转换器的相关控制器允许实现突发模式功能，而不会产生声学噪声，并且将输出中提供的调节的直流电压或电流的纹波相对减小到所提供的负载。 该方法包括在突发周期开始时感测误差信号与脉冲串 - 停止阈值之间的差异。 如果误差信号已经超过（向上或向下）突发停止阈值，则该方法将时钟信号的新的有效边沿处的开关级设置为高阻抗状态，将开关级保持在高阻抗状态 时钟信号的整数周期，并且重新使能开关级将能量槽电路切换到爆发周期结束。 基于误差信号和突发停止阈值之间的差异来确定整数，

公开(公告)号：US20130088897A1

公开(公告)日：2013-04-11

申请号：US13689422

申请日：2012-11-29

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna

IPC: H02M3/335

CPC classification number: H02M3/3353 ,  H02M3/33507 ,  H02M3/33523 ,  H02M7/2176 ,  H02M2001/0022

Abstract: An integrated circuit controls a switch of a switching current regulator. The current regulator comprises primary and secondary windings where a first and a second current flow, respectively. The switch is adapted to initiate or interrupt the circulation of the first current in the primary winding. The control integrated circuit comprises a comparator configured to compare a first signal representative of said first current to a second signal and a divider circuit configured to generate said second signal as a ratio of a third signal, proportional to a voltage on the primary winding, with a voltage on a capacitor. The capacitor is charged by a further current controlled by the third signal when the second current is different from zero. The capacitor is discharged through a parallel-connected resistor when the value of said second current is substantially zero.

Abstract translation: 集成电路控制开关电流调节器的开关。 电流调节器包括分别具有第一和第二电流的初级和次级绕组。 开关适于启动或中断初级绕组中的第一电流的循环。 所述控制集成电路包括：比较器，被配置为将表示所述第一电流的第一信号与第二信号进行比较;以及分频器电路，被配置为产生所述第二信号，所述比较器与所述初级绕组上的电压成正比的第三信号与 电容上的电压。 当第二电流不同于零时，通过由第三信号控制的另一电流对电容器进行充电。 当所述第二电流的值基本上为零时，电容器通过并联电阻器放电。

公开(公告)号：US12156303B2

公开(公告)日：2024-11-26

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：US12144077B2

公开(公告)日：2024-11-12

申请号：US17490034

申请日：2021-09-30

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Gritti ,  Claudio Adragna

IPC: H05B45/325 ,  H05B45/10 ,  H05B45/397

Abstract: An LED lighting system includes switching circuitry adjustably driving a string of LEDs and being controlled by a reference current and an enable signal. A controller generates the reference current and enable signal based upon a PWM signal such that the switching circuitry: sources a first LED current to the string of LEDs that is proportional to a duty cycle of the PWM signal when the duty cycle is greater than a threshold duty cycle to thereby perform analog dimming; and sources a second LED current to the string of LEDs that has a duty cycle proportional to the duty cycle of the PWM signal when the duty cycle of the PWM signal is less than the threshold duty cycle, such that an average LED current delivered to the string of LEDs is proportional to the duty cycle of the PWM signal to thereby perform digital dimming.

公开(公告)号：US20230098059A1

公开(公告)日：2023-03-30

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 dessert 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.