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公开(公告)号：US20200295723A1
公开(公告)日：2020-09-17
申请号：US16354760
申请日：2019-03-15
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： Ru Feng Du , Qi Yu Liu
IPC: H03G1/04 , H03K19/017 , H03F3/217 , H03K19/096 , H03K19/20 , H03K19/003 , H03G3/30
Abstract: In an embodiment, a class-D amplifier includes an input terminal configured to receive an input signal; a comparator having an input coupled to the input terminal; a deglitching circuit having an input coupled to an output of the comparator; and a driving circuit having an input coupled to an output of the deglitching circuit. The deglitching circuit includes a logic circuit coupled between the input of the deglitching circuit and the output of the deglitching circuit. The logic circuit is configured to receive a clock signal having the same frequency as the switching frequency of the class-D amplifier.
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公开(公告)号：US10530309B2
公开(公告)日：2020-01-07
申请号：US16222281
申请日：2018-12-17
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Ru Feng Du , Qi Yu Liu
IPC: H03F1/32 , H03F1/30 , H03F1/02 , H03F3/45 , H03F3/183 , H03F3/185 , H03F3/187 , H03F3/21 , H03F3/217 , H03G3/34 , H04R3/00
Abstract: A class D amplifier receives and amplifies a differential analog signal which is then differentially integrated. Two pulse width modulators generate pulse signals corresponding to the differentially integrated analog signal and two power units generate output pulse signals. The outputs the power units are coupled to input terminals of integrators via a resistor feedback network. An analog output unit converts the pulse signals to an output analog signal. The differential integration circuitry implements a soft transition between mute/un-mute. In mute, the integrator output is fixed. During the soft transition, the PWM outputs change slowly from a fixed 50% duty cycle to a final value to ensure that no pop noise is present in the output as a result of mode change.
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公开(公告)号：US10209725B2
公开(公告)日：2019-02-19
申请号：US15675872
申请日：2017-08-14
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Ni Zeng
IPC: G05F1/573
Abstract: A current limiting circuit includes a current sensing module that is configured to sense an output current of a power transistor and to generate a corresponding sensing current which is proportional to the output current. A first current limiting module coupled to the current sensing module is configured to generate a first limiting current based on the sensing current when a variation of the output current of the power transistor exceeds a first current level. A second current limiting module coupled to the current sensing module is configured to generate a second limiting current based on the sensing current when a variation of the output current of the power transistor exceeds a second current level. A converting module coupled to the first and second current limiting modules and the power transistor controls a gate voltage of the power transistor based at least on the first and second limiting currents.
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公开(公告)号：US20180242419A1
公开(公告)日：2018-08-23
申请号：US15956598
申请日：2018-04-18
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Tao Tao Huang , Yi Jun Duan
CPC classification number: H05B33/0851 , H03F3/45215 , H03F2200/351 , H05B33/0812 , H05B33/0815 , H05B33/0827 , H05B33/0887 , Y02B20/341 , Y02B20/347
Abstract: A driving apparatus configured to drive a light emitting device includes a driving current source module operable to supply current to the light emitting device via a node during operation. A protection module coupled to the node and the driving current source module selectively injects current to the node during operation. The driving current source module is controlled based on a detection result of a voltage on the node.
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公开(公告)号：US09980333B2
公开(公告)日：2018-05-22
申请号：US15486652
申请日：2017-04-13
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
Inventor： Yi Jun Duan , Tao Tao Huang
CPC classification number: H05B33/0851 , H03F3/45215 , H03F2200/351 , H05B33/0812 , H05B33/0815 , H05B33/0827 , H05B33/0887 , Y02B20/341 , Y02B20/347
Abstract: A driving apparatus configured to drive a light emitting device includes a driving current source module operable to supply current to the light emitting device via a node during operation. A protection module coupled to the node and the driving current source module selectively injects current to the node during operation. The driving current source module is controlled based on a detection result of a voltage on the node.
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Patent Agency Ranking
公开(公告)号：US09891250B2
公开(公告)日：2018-02-13
申请号：US15641088
申请日：2017-07-03
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Yijun Duan
IPC: G01R19/12 , H03L7/00 , H05B33/08 , G01R19/165
CPC classification number: G01R19/12 , G01R19/16557 , H05B33/0845 , H05B33/0887
Abstract: A bidirectional voltage differentiator circuit comprises start-up circuitry, sensing circuitry, and output circuitry coupled to logic circuitry. The start-up circuitry acts to start-up the sensing circuitry when the circuit is powered on, and accelerates the response of the sensing circuitry thereafter. The sensing circuitry senses variation in an input voltage applied to an input node. Responsive to the voltage variation sensed by the sensing circuitry, the output circuitry produces a state change at a first or second output node. The logic circuitry receives the states of the output nodes and produces a logic output signal to indicate the occurrence of the variation sensed in the input voltage. The voltage sensing circuit is operable to sense variation of the input voltage regardless of whether the voltage is rising or falling and without regard to the DC value of the input voltage.
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公开(公告)号：US20180017983A1
公开(公告)日：2018-01-18
申请号：US15675872
申请日：2017-08-14
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Ni Zeng
IPC: G05F1/573
CPC classification number: G05F1/573
Abstract: A current limiting circuit includes a current sensing module that is configured to sense an output current of a power transistor and to generate a corresponding sensing current which is proportional to the output current. A first current limiting module coupled to the current sensing module is configured to generate a first limiting current based on the sensing current when a variation of the output current of the power transistor exceeds a first current level. A second current limiting module coupled to the current sensing module is configured to generate a second limiting current based on the sensing current when a variation of the output current of the power transistor exceeds a second current level. A converting module coupled to the first and second current limiting modules and the power transistor controls a gate voltage of the power transistor based at least on the first and second limiting currents.
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公开(公告)号：US09853560B2
公开(公告)日：2017-12-26
申请号：US14747242
申请日：2015-06-23
Applicant: STMICROELECTRONICS (SHENZHEN) R&D CO. LTD , STMICROELECTRONICS (CHINA) INVESTMENT CO. LTD
Inventor： Henry Ge , Welsin Wang , Xing Zhang
CPC classification number: H02M7/06 , G01R11/40 , G01R11/42 , H02M7/068 , H02M2001/0064
Abstract: Congruent power and timing signals in a single electronic device. In an embodiment, a circuit may include just one isolation transformer operable to generate a power signal and a timing signal. On the secondary side, two branches may extract both a power signal and a clock signal for use in the circuit on the isolated secondary side. The first branch may be coupled to the transformer and operable to manipulate the signal into a power signal, such as a 5V DC signal. Likewise, the second circuit branch is operable to manipulate the signal into a clock signal, such as a 5 V signal with a frequency of 1 MHz. By extracting both a power supply signal and a clock signal from the same isolation transformer on the secondary side, valuable space may be saved on an integrated circuit device with only having a single winding for a single isolation transformer.
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公开(公告)号：US09836075B2
公开(公告)日：2017-12-05
申请号：US14521536
申请日：2014-10-23
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Min Chen , Wen Liu , Hong Xia Li
Abstract: A voltage detector operates to detect a system power supply voltage and generate a trigger signal. A control signal generator responds to the trigger signal and generates a control signal. A DC bias generator responds to the control signal by generating a DC bias. The control signal controls the DC bias to have a first value when the power supply voltage is a first voltage and have a second value when the power supply voltage is a second voltage different from the first voltage, wherein the first value is different from the second value. A dynamic DC bias is generated which can not only support a larger voltage scope, but also significantly improves signal to noise ratio. The system power supply detection may concern stop/start operation of an automobile engine.
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公开(公告)号：US09772638B2
公开(公告)日：2017-09-26
申请号：US14592040
申请日：2015-01-08
Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd
Inventor： Ni Zeng
IPC: G05F1/575
CPC classification number: G05F1/575
Abstract: A low dropout amplifier may include an error amplifier having first and second inputs coupled to a reference signal and a feedback signal, respectively. The error amplifier may be configured to generate first and second error signals at first and second outputs, respectively, with the first and second error signals based upon a difference between the reference signal and the feedback signal. A sink stage may be coupled to the first output and configured to generate a sink current based upon the first error signal. A source stage may be coupled to the second output and configured to generate a source current based upon the second error signal. An output node may be coupled to receive the sink and source currents.
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