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：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。