公开(公告)号：US10890606B2

公开(公告)日：2021-01-12

申请号：US16443439

申请日：2019-06-17

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Massimiliano Gobbi ,  Ignazio Salvatore Bellomo ,  Domenico Tripodi ,  Antonio Borrello ,  Alberto Bianco

IPC: G01R19/04 ,  G01R19/165 ,  H02J7/00 ,  H02J7/34 ,  H02M1/32

Abstract: An active discharge circuit discharges an X capacitor and includes a sensor circuit that generates a sensor signal indicative of an AC voltage at the X capacitor. A processing unit generates a reset signal as a function of a comparison signal. A comparator circuit generates the comparison signal by comparing the sensor signal with a threshold. A timer circuit sets a discharge enable signal to a first logic level when the timer circuit is reset via a reset signal. The timer circuit determines the time elapsed since the last reset and tests whether the time elapsed exceeds a given timeout value. If the time elapsed exceeds the given timeout value, the timer circuit sets the discharge enable signal to a second logic level. A dynamic threshold generator circuit varies the threshold of the comparator circuit as a function of the sensor signal.

公开(公告)号：US20160124029A1

公开(公告)日：2016-05-05

申请号：US14838125

申请日：2015-08-27

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Massimiliano Gobbi ,  Ignazio Salvatore Bellomo ,  Domenico Tripodi ,  Antonio Borrello ,  Alberto Bianco

IPC: G01R19/165 ,  H02J7/00 ,  G01R19/04

CPC classification number: G01R19/16557 ,  G01R19/04 ,  H02J7/0072 ,  H02J7/345 ,  H02M2001/322

Abstract: An active discharge circuit discharges an X. The detection circuit includes a sensor circuit that generates a sensor signal indicative of an AC oscillation voltage at the X capacitor. The detection circuit also includes a processing unit that generates the reset signal as a function of a comparison signal. A comparator circuit generates the comparison signal by comparing the sensor signal with a threshold. A timer circuit sets a discharge enable signal to a first logic level when the timer circuit is reset via a reset signal. The timer circuit determines the time elapsed since the last reset and tests whether the time elapsed exceeds a given timeout value. If the time elapsed exceeds the given timeout value, the timer circuit sets the discharge enable signal to a second logic level. A dynamic threshold generator circuit varies the threshold of the comparator circuit as a function of the sensor signal.

Abstract translation: 有源放电电路对X放电。检测电路包括传感器电路，其生成表示X电容器处的交流振荡电压的传感器信号。 检测电路还包括根据比较信号产生复位信号的处理单元。 比较器电路通过将传感器信号与阈值进行比较来生成比较信号。 当定时器电路通过复位信号复位时，定时器电路将放电使能信号设置为第一逻辑电平。 定时器电路确定自上次复位以来经过的时间，并测试经过的时间是否超过给定的超时值。 如果经过的时间超过给定的超时值，则定时器电路将放电使能信号设置为第二逻辑电平。 动态阈值发生器电路根据传感器信号改变比较器电路的阈值。

公开(公告)号：US11750010B2

公开(公告)日：2023-09-05

申请号：US17103692

申请日：2020-11-24

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Massimiliano Gobbi ,  Ignazio Salvatore Bellomo ,  Domenico Tripodi ,  Antonio Borrello ,  Alberto Bianco

IPC: H02J7/34 ,  G01R19/04 ,  H02J7/00 ,  G01R19/165 ,  H02M1/32

CPC classification number: H02J7/0071 ,  G01R19/04 ,  G01R19/16557 ,  H02J7/345 ,  H02M1/322

Abstract: A method and apparatus for an active discharge of an X-capacitor are provided. A sensor signal, indicative of a voltage at the capacitor, is compared with a lower and upper threshold values. A first value of a smaller one of the lower and upper threshold values is increased to a first new value that is greater than a second value of a larger one of the lower and upper threshold values in response to a first control signal indicating the sensor signal is greater than the upper and lower threshold values. A third value of the greater one of the lower and upper threshold values is decreased to a second new value that is less than the value of the larger one of the lower and upper threshold values in response to a second control signal indicating the sensor signal is less than the upper and lower threshold values.

公开(公告)号：US12136883B2

公开(公告)日：2024-11-05

申请号：US17951703

申请日：2022-09-23

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Claudio Adragna ,  Massimiliano Gobbi ,  Giuseppe Bosisio

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/34

Abstract: An active flyback converter is transitioned between a plurality of operational states based on a comparison of a control voltage signal to voltage thresholds and a count of a number of consecutive switching cycles during which a clamp switch is kept off. The plurality of operational states includes a run state, an idle state, a first burst state, and a second burst state. Each set of consecutive switching cycles of the first burst state includes a determined number of switching cycles during which signals are generated to turn the power switch on and off and to maintain an off state of the clamp switch, and a switching cycle in a determined position in the set of switching cycles during which signals are sequentially generated to turn the power switch on, turn the power switch off, turn the clamp switch on and turn the clamp switch off.

公开(公告)号：US20210080491A1

公开(公告)日：2021-03-18

申请号：US17103692

申请日：2020-11-24

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Massimiliano Gobbi ,  Ignazio Salvatore Bellomo ,  Domenico Tripodi ,  Antonio Borrello ,  Alberto Bianco

IPC: G01R19/165 ,  G01R19/04

Abstract: An active discharge circuit discharges an X capacitor and includes a sensor circuit that generates a sensor signal indicative of an AC voltage at the X capacitor. A processing unit generates a reset signal as a function of a comparison signal. A comparator circuit generates the comparison signal by comparing the sensor signal with a threshold. A timer circuit sets a discharge enable signal to a first logic level when the timer circuit is reset via a reset signal. The timer circuit determines the time elapsed since the last reset and tests whether the time elapsed exceeds a given timeout value. If the time elapsed exceeds the given timeout value, the timer circuit sets the discharge enable signal to a second logic level. A dynamic threshold generator circuit varies the threshold of the comparator circuit as a function of the sensor signal.

公开(公告)号：US10345348B2

公开(公告)日：2019-07-09

申请号：US14838125

申请日：2015-08-27

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Massimiliano Gobbi ,  Ignazio Salvatore Bellomo ,  Domenico Tripodi ,  Antonio Borrello ,  Alberto Bianco

IPC: H02J7/00 ,  G01R19/165 ,  G01R19/04 ,  H02M1/32 ,  H02J7/34

Abstract: An active discharge circuit discharges an X capacitor and includes a sensor circuit that generates a sensor signal indicative of an AC voltage at the X capacitor. A processing unit generates a reset signal as a function of a comparison signal. A comparator circuit generates the comparison signal by comparing the sensor signal with a threshold. A timer circuit sets a discharge enable signal to a first logic level when the timer circuit is reset via a reset signal. The timer circuit determines the time elapsed since the last reset and tests whether the time elapsed exceeds a given timeout value. If the time elapsed exceeds the given timeout value, the timer circuit sets the discharge enable signal to a second logic level. A dynamic threshold generator circuit varies the threshold of the comparator circuit as a function of the sensor signal.