公开(公告)号：US20160126846A1

公开(公告)日：2016-05-05

申请号：US14829398

申请日：2015-08-18

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Francesco Ferrazza ,  Davide Lena ,  Mirko Gravati ,  Domenico Tripodi ,  Massimiliano Leggenda

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/33523 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A control device for a switching converter having a transformer, with a primary winding receiving an input quantity, a secondary winding providing an output quantity, an auxiliary winding providing a feedback quantity, and a switch element. The control device has a processing module for generating a control signal for switching the switch element on the basis of the feedback quantity in order to regulate the output quantity via alternation of phases of storage and transfer of energy. The processing module controls the end of the transfer phase by comparing the feedback quantity with a comparison threshold. A discrimination circuit generates a signal for discrimination between the presence of a short circuit on the output or the fact that the input quantity is lower than a threshold. The processing module controls the end of the energy-transfer phase also on the basis of the discrimination signal.

Abstract translation: 一种用于具有变压器的开关转换器的控制装置，其中初级绕组接收输入量，提供输出量的次级绕组，提供反馈量的辅助绕组和开关元件。 控制装置具有处理模块，用于根据反馈量产生用于切换开关元件的控制信号，以通过存储和能量转移的相位的交替来调节输出量。 处理模块通过将反馈量与比较阈值进行比较来控制转移阶段的结束。 识别电路产生用于区分输出上的短路存在或输入量低于阈值的事实的信号。 处理模块也基于鉴别信号控制能量转移阶段的结束。

公开(公告)号：US09918364B2

公开(公告)日：2018-03-13

申请号：US15604811

申请日：2017-05-25

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0812 ,  H05B33/0815 ,  H05B33/0842

Abstract: An electronic circuit drives a plurality of LED strings connected in series. The electronic circuit includes a regulation module corresponding to each LED string, with the regulation module connected to the cathode terminal of the corresponding LED string. Each regulation module is further coupled to receive a reference voltage in phase with a rectified a.c. voltage. The regulation modules execute in turn and in sequence a current-regulation phase as a function of a trend of the reference voltage. Each regulation module, when executing the current-regulation phase, functions to regulate the current that flows in the corresponding LED string and in any previous LED strings in the series connection so that the regulated current is proportional to the reference voltage.

公开(公告)号：US10129942B2

公开(公告)日：2018-11-13

申请号：US15830788

申请日：2017-12-04

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

Abstract: LED strings cascaded to one another are driven by an electronic circuit that includes regulation modules and a brightness-compensation module. The regulation modules carry out in sequence a current-regulation phase, in which they regulate the current that flows in the corresponding LED strings. The regulation module includes: a compensation regulator coupled to a compensation LED string and to a capacitor and a generator that generates an electrical quantity indicating the luminous flux emitted by the LED strings and by the compensation LED string. The compensation regulator regulates a current that flows in the compensation LED string as a function of the electrical quantity, discharging the capacitor through the compensation LED string.

公开(公告)号：US20180092168A1

公开(公告)日：2018-03-29

申请号：US15830788

申请日：2017-12-04

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0812 ,  H05B33/0845

Abstract: LED strings cascaded to one another are driven by an electronic circuit that includes regulation modules and a brightness-compensation module. The regulation modules carry out in sequence a current-regulation phase, in which they regulate the current that flows in the corresponding LED strings. The regulation module includes: a compensation regulator coupled to a compensation LED string and to a capacitor and a generator that generates an electrical quantity indicating the luminous flux emitted by the LED strings and by the compensation LED string. The compensation regulator regulates a current that flows in the compensation LED string as a function of the electrical quantity, discharging the capacitor through the compensation LED string.

公开(公告)号：US09730285B2

公开(公告)日：2017-08-08

申请号：US15162289

申请日：2016-05-23

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0812 ,  H05B33/0815 ,  H05B33/0842

Abstract: An electronic circuit drives a plurality of LED strings connected in series. The electronic circuit includes a regulation module corresponding to each LED string, with the regulation module connected to the cathode terminal of the corresponding LED string. Each regulation module is further coupled to receive a reference voltage in phase with a rectified a.c. voltage. The regulation modules execute in turn and in sequence a current-regulation phase as a function of a trend of the reference voltage. Each regulation module, when executing the current-regulation phase, functions to regulate the current that flows in the corresponding LED string and in any previous LED strings in the series connection so that the regulated current is proportional to the reference voltage.

公开(公告)号：US20170196054A1

公开(公告)日：2017-07-06

申请号：US15162289

申请日：2016-05-23

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0812 ,  H05B33/0815 ,  H05B33/0842

Abstract: An electronic circuit drives a plurality of LED strings connected in series. The electronic circuit includes a regulation module corresponding to each LED string, with the regulation module connected to the cathode terminal of the corresponding LED string. Each regulation module is further coupled to receive a reference voltage in phase with a rectified a.c. voltage. The regulation modules execute in turn and in sequence a current-regulation phase as a function of a trend of the reference voltage. Each regulation module, when executing the current-regulation phase, functions to regulate the current that flows in the corresponding LED string and in any previous LED strings in the series connection so that the regulated current is proportional to the reference voltage.

公开(公告)号：US09948188B2

公开(公告)日：2018-04-17

申请号：US14829398

申请日：2015-08-18

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Francesco Ferrazza ,  Davide Lena ,  Mirko Gravati ,  Domenico Tripodi ,  Massimiliano Leggenda

IPC: H02M7/217 ,  H02M3/335 ,  H02M1/08 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M3/33523 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

Abstract: A control device for a switching converter having a transformer, with a primary winding receiving an input quantity, a secondary winding providing an output quantity, an auxiliary winding providing a feedback quantity, and a switch element. The control device has a processing module for generating a control signal for switching the switch element on the basis of the feedback quantity in order to regulate the output quantity via alternation of phases of storage and transfer of energy. The processing module controls the end of the transfer phase by comparing the feedback quantity with a comparison threshold. A discrimination circuit generates a signal for discrimination between the presence of a short circuit on the output or the fact that the input quantity is lower than a threshold. The processing module controls the end of the energy-transfer phase also on the basis of the discrimination signal.

公开(公告)号：US09867245B2

公开(公告)日：2018-01-09

申请号：US15421610

申请日：2017-02-01

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0812 ,  H05B33/0845

Abstract: LED strings cascaded to one another are driven by an electronic circuit that includes regulation modules and a brightness-compensation module. The regulation modules carry out in sequence a current-regulation phase, in which they regulate the current that flows in the corresponding LED strings. The regulation module includes: a compensation regulator coupled to a compensation LED string and to a capacitor and a generator that generates an electrical quantity indicating the luminous flux emitted by the LED strings and by the compensation LED string. The compensation regulator regulates a current that flows in the compensation LED string as a function of the electrical quantity, discharging the capacitor through the compensation LED string.

公开(公告)号：US20170265257A1

公开(公告)日：2017-09-14

申请号：US15604811

申请日：2017-05-25

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0812 ,  H05B33/0815 ,  H05B33/0842

Abstract: An electronic circuit drives a plurality of LED strings connected in series. The electronic circuit includes a regulation module corresponding to each LED string, with the regulation module connected to the cathode terminal of the corresponding LED string. Each regulation module is further coupled to receive a reference voltage in phase with a rectified a.c. voltage. The regulation modules execute in turn and in sequence a current-regulation phase as a function of a trend of the reference voltage. Each regulation module, when executing the current-regulation phase, functions to regulate the current that flows in the corresponding LED string and in any previous LED strings in the series connection so that the regulated current is proportional to the reference voltage.

公开(公告)号：US20170196051A1

公开(公告)日：2017-07-06

申请号：US15421610

申请日：2017-02-01

Applicant: STMicroelectronics S.r.l.

Inventor： Davide Lena ,  Simone Crespi

IPC: H05B33/08

CPC classification number: H05B33/083 ,  H05B33/0812 ,  H05B33/0845

Abstract: LED strings cascaded to one another are driven by an electronic circuit that includes regulation modules and a brightness-compensation module. The regulation modules carry out in sequence a current-regulation phase, in which they regulate the current that flows in the corresponding LED strings. The regulation module includes: a compensation regulator coupled to a compensation LED string and to a capacitor and a generator that generates an electrical quantity indicating the luminous flux emitted by the LED strings and by the compensation LED string. The compensation regulator regulates a current that flows in the compensation LED string as a function of the electrical quantity, discharging the capacitor through the compensation LED string.