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。

公开(公告)号：US20160252918A1

公开(公告)日：2016-09-01

申请号：US14632774

申请日：2015-02-26

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Claudio Adragna

IPC: G05F1/56

CPC classification number: H02M3/33569 ,  G05F1/56 ,  H02M3/156

Abstract: The present disclosure is directed to a switching power converter having a regulated output voltage or output current. The power converter uses a control unit having a signal conditioning circuit to produce a control voltage signal, which is used to drive a power stage of the converter. The signal conditioning circuit includes a comparator that compares a measured electrical quantity to a reference value representative of a desired regulated output quantity, and produces a digital detection signal based on the comparison. A control actuator uses the digital detection signal to produce a correction signal, which is received by an averaging circuit. The averaging circuit then produces the control voltage signal based on an average of the correction signal.

Abstract translation: 本公开涉及具有调节的输出电压或输出电流的开关功率转换器。 功率转换器使用具有信号调节电路的控制单元来产生用于驱动转换器的功率级的控制电压信号。 信号调节电路包括将测量电量与表示期望的调节输出量的参考值进行比较的比较器，并且基于该比较产生数字检测信号。 控制致动器使用数字检测信号来产生由平均电路接收的校正信号。 平均电路然后基于校正信号的平均值产生控制电压信号。

公开(公告)号：US20160013722A1

公开(公告)日：2016-01-14

申请号：US14860570

申请日：2015-09-21

Applicant: STMicroelectronics S.r.l.

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

IPC: H02M3/335

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

Abstract: A control device controls a switching circuit for a converter. The switching circuit comprises a half-bridge having a high-side transistor and a low-side transistor. The control device comprises a controller configured to control turning on and turning off said two transistors, so that a square-wave voltage is applied to the transformer primary. The controller is configured to start switching the half-bridge by turning on the low-side transistor. The control device comprises a first timer configure to initially turn on the low-side transistor for a duration given by a first time period useful for pre-charging a bootstrap capacitor couplable to the middle point of the half-bridge, and a second timer configured to keep the low-side transistor and the high-side transistor turned off for a second time period immediately following the first time period and having a longer duration than the first time period.

Abstract translation: 控制装置控制转换器的开关电路。 开关电路包括具有高侧晶体管和低侧晶体管的半桥。 控制装置包括控制器，其被配置为控制导通和截止所述两个晶体管，使得方波电压被施加到变压器初级。 控制器配置为通过打开低端晶体管来开始切换半桥。 控制装置包括第一定时器，其配置为在第一时间周期内最初使低侧晶体管导通，该持续时间可用于对可耦合到半桥的中点的自举电容器进行预充电，以及第二定时器配置 为了保持低侧晶体管和高侧晶体管在第一时间段之后紧接第二时间段并且具有比第一时间段更长的持续时间。

公开(公告)号：US09094006B2

公开(公告)日：2015-07-28

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: H02M3/156 ,  H03K17/082 ,  H02M1/32 ,  H02M3/338 ,  H02M1/36 ,  H02M1/38 ,  H02M1/00

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：US09083250B2

公开(公告)日：2015-07-14

申请号：US13951259

申请日：2013-07-25

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna

IPC: H02M3/335 ,  H02M3/315

CPC classification number: H02M3/33507 ,  H02M3/315 ,  H02M3/335 ,  H02M3/33515 ,  H02M3/33523 ,  Y02B70/1433

Abstract: A method for controlling a switching regulator includes defining a waiting time during which a trigger signal corresponding to a recirculation signal of the switching regulator is ignored holding a control switch in an open condition, and detecting a number of local valleys of the recirculation signal during the waiting time. In particular, defining the waiting time is performed for each switching cycle by adding a first value, which is determined on the basis of a load on the regulator, to a second variable value, which is proportional to the number valleys detected during the waiting time of the preceding switching cycle.

Abstract translation: 用于控制开关调节器的方法包括定义等待时间，在该等待时间期间，与开关调节器的再循环信号相对应的触发信号被忽略，保持控制开关处于打开状态，并且在该期间检测再循环信号的局部谷数 等待的时间。 特别地，通过将​​基于调节器上的负载确定的第一值与在等待时间内检测到的数量谷成正比的第二可变值相加来为每个切换周期执行定义等待时间 的前一个开关周期。

公开(公告)号：US09077253B2

公开(公告)日：2015-07-07

申请号：US13689422

申请日：2012-11-29

Applicant: STMicroelectronics S.r.l.

Inventor： Claudio Adragna

IPC: H02M3/335 ,  H02M7/217 ,  H02M1/00

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 includes 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 includes a comparator configured to compare a first signal representative of the first current to a second signal and a divider circuit configured to generate the 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。 控制集成电路包括：比较器，被配置为将表示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，其被配置为产生第二信号，作为与初级绕组上的电压成正比的第三信号与第一信号成比例的比率与 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。