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1.发明申请公开(公告)号：US20190081617A1
公开(公告)日：2019-03-14
申请号：US15704094
申请日：2017-09-14
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
Abstract: In accordance with an embodiment, a method includes receiving an enable signal. After the enable signal is asserted, it is determined whether a soft-start capacitor is electrically connected to an input of a ramp generator circuit while keeping an output of the ramp generator circuit low. If the soft-start capacitor is electrically connected to the input of the ramp generator circuit, a first current is injected into the input of the ramp generator circuit to generate a first voltage ramp at the output of the ramp generator circuit. If the soft-start capacitor is not electrically connected to the input of the ramp generator circuit, a second current is injected to the input of the ramp generator circuit to generate a second voltage ramp at the output of the ramp generator circuit. The second current is smaller than the first current.
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公开(公告)号：US10394259B2
公开(公告)日：2019-08-27
申请号：US14838706
申请日：2015-08-28
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
IPC: G05F1/46
Abstract: A power transistor generates an output current and a sense transistor generates a proportional sense current. A differential amplifier generates a gate voltage applied to the power and sense transistors in response to first and second input signals. A comparator circuit compares the gate voltage to a switching reference to detect whether the power and sense transistors are operating in a triode mode of operation or in a saturation mode of operation. At least one of the first and second input signals is modified in response to the detection made by the comparator circuit. In one instance, different reference voltages are applied to an input of the amplifier depending on the detected mode of operation. In another instance, different resistances are used to convert the sense current to a voltage for application to an input of the amplifier in response to the detected mode of operation.
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3.发明申请公开(公告)号：US20200169250A1
公开(公告)日：2020-05-28
申请号：US16775952
申请日：2020-01-29
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
Abstract: In accordance with an embodiment, a method includes receiving an enable signal. After the enable signal is asserted, it is determined whether a soft-start capacitor is electrically connected to an input of a ramp generator circuit while keeping an output of the ramp generator circuit low. If the soft-start capacitor is electrically connected to the input of the ramp generator circuit, a first current is injected into the input of the ramp generator circuit to generate a first voltage ramp at the output of the ramp generator circuit. If the soft-start capacitor is not electrically connected to the input of the ramp generator circuit, a second current is injected to the input of the ramp generator circuit to generate a second voltage ramp at the output of the ramp generator circuit. The second current is smaller than the first current.
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公开(公告)号：US11467611B2
公开(公告)日：2022-10-11
申请号：US16508726
申请日：2019-07-11
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
Abstract: A power transistor generates an output current and a sense transistor generates a proportional sense current. A differential amplifier generates a gate voltage applied to the power and sense transistors in response to first and second input signals. A comparator circuit compares the gate voltage to a switching reference to detect whether the power and sense transistors are operating in a triode mode of operation or in a saturation mode of operation. At least one of the first and second input signals is modified in response to the detection made by the comparator circuit. In one instance, different reference voltages are applied to an input of the amplifier depending on the detected mode of operation. In another instance, different resistances are used to convert the sense current to a voltage for application to an input of the amplifier in response to the detected mode of operation.
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5.发明授权公开(公告)号：US11264893B2
公开(公告)日：2022-03-01
申请号：US16775952
申请日：2020-01-29
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
Abstract: In accordance with an embodiment, a method includes receiving an enable signal. After the enable signal is asserted, it is determined whether a soft-start capacitor is electrically connected to an input of a ramp generator circuit while keeping an output of the ramp generator circuit low. If the soft-start capacitor is electrically connected to the input of the ramp generator circuit, a first current is injected into the input of the ramp generator circuit to generate a first voltage ramp at the output of the ramp generator circuit. If the soft-start capacitor is not electrically connected to the input of the ramp generator circuit, a second current is injected to the input of the ramp generator circuit to generate a second voltage ramp at the output of the ramp generator circuit. The second current is smaller than the first current.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20190158074A1
公开(公告)日：2019-05-23
申请号：US16254839
申请日：2019-01-23
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
Abstract: In accordance with an embodiment, a method includes receiving an enable signal. After the enable signal is asserted, it is determined whether a soft-start capacitor is electrically connected to an input of a ramp generator circuit while keeping an output of the ramp generator circuit low. If the soft-start capacitor is electrically connected to the input of the ramp generator circuit, a first current is injected into the input of the ramp generator circuit to generate a first voltage ramp at the output of the ramp generator circuit. If the soft-start capacitor is not electrically connected to the input of the ramp generator circuit, a second current is injected to the input of the ramp generator circuit to generate a second voltage ramp at the output of the ramp generator circuit. The second current is smaller than the first current.
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公开(公告)号：US09078315B2
公开(公告)日：2015-07-07
申请号：US14154573
申请日：2014-01-14
Applicant: STMicroelectronics S.r.l.
Inventor： Salvatore Pantano , Marco Martini
IPC: H05B33/08
CPC classification number: H05B33/0815 , H05B33/0827 , H05B33/0848
Abstract: An array of LED diodes includes N channels each having LEDs coupled in series with a switch. A current driver for the array includes a processing circuit configured to detect N currents flowing respectively through the N channels of the array. The detected currents are converted by a single analog to digital converter, one at a time, into a digital word. The circuit further includes N comparator devices configured to control the N switches as result of a comparison between the digital words and respective target digital words. A memory is provided for storing the digital words received from the analog to digital converter.
Abstract translation: LED二极管阵列包括N个通道，每个通道具有与开关串联的LED。 用于阵列的电流驱动器包括处理电路，其被配置为检测分别通过阵列的N个通道流动的N个电流。 检测到的电流由单个模数转换器转换成一个数字字。 电路还包括N个比较器装置，其被配置为通过数字字和各个目标数字字之间的比较来控制N个开关。 提供存储器，用于存储从模数转换器接收的数字字。
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公开(公告)号：US09072139B2
公开(公告)日：2015-06-30
申请号：US14154367
申请日：2014-01-14
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini , Salvatore Pantano
CPC classification number: H05B33/0815 , H02M1/36 , H05B33/0812 , H05B33/0848 , Y02B20/343
Abstract: A current driver for a string of LEDs includes a first series connection of a first transistor and a first resistance and a second series connection of a second transistor and a second resistance. The first and second series connections are coupled in parallel between the string of LEDs and a voltage reference. An operational amplifier selectively drives the first and second transistors in response to a clock signal. A switch device driven by the clock signal alternately applies a reference voltage and a respective one of the voltages across the first and second resistances to inverting and non-inverting inputs of the operational amplifier in response to the clock signal. A storage circuit is coupled to the output of the operational amplifier to store the drive signals for the first and second transistors for application to the first and second transistors in the absence of output from the operational amplifier.
Abstract translation: 用于一串LED的电流驱动器包括第一晶体管和第一电阻的第一串联连接以及第二晶体管和第二电阻的第二串联连接。 第一和第二串联连接并联在LED串和电压基准之间。 运算放大器响应于时钟信号选择性地驱动第一和第二晶体管。 由时钟信号驱动的开关装置响应于时钟信号交替地将参考电压和跨第一和第二电阻的电压中的相应电压施加到运算放大器的反相和非反相输入。 在没有来自运算放大器的输出的情况下，存储电路耦合到运算放大器的输出端以存储用于第一和第二晶体管的驱动信号，以用于第一和第二晶体管。
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9.发明授权公开(公告)号：US10673422B2
公开(公告)日：2020-06-02
申请号：US16254839
申请日：2019-01-23
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
Abstract: In accordance with an embodiment, a method includes receiving an enable signal. After the enable signal is asserted, it is determined whether a soft-start capacitor is electrically connected to an input of a ramp generator circuit while keeping an output of the ramp generator circuit low. If the soft-start capacitor is electrically connected to the input of the ramp generator circuit, a first current is injected into the input of the ramp generator circuit to generate a first voltage ramp at the output of the ramp generator circuit. If the soft-start capacitor is not electrically connected to the input of the ramp generator circuit, a second current is injected to the input of the ramp generator circuit to generate a second voltage ramp at the output of the ramp generator circuit. The second current is smaller than the first current.
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10.发明授权公开(公告)号：US10230358B1
公开(公告)日：2019-03-12
申请号：US15704094
申请日：2017-09-14
Applicant: STMicroelectronics S.r.l.
Inventor： Marco Martini
Abstract: In accordance with an embodiment, a method includes receiving an enable signal. After the enable signal is asserted, it is determined whether a soft-start capacitor is electrically connected to an input of a ramp generator circuit while keeping an output of the ramp generator circuit low. If the soft-start capacitor is electrically connected to the input of the ramp generator circuit, a first current is injected into the input of the ramp generator circuit to generate a first voltage ramp at the output of the ramp generator circuit. If the soft-start capacitor is not electrically connected to the input of the ramp generator circuit, a second current is injected to the input of the ramp generator circuit to generate a second voltage ramp at the output of the ramp generator circuit. The second current is smaller than the first current.
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