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公开(公告)号：US20170150281A1
公开(公告)日：2017-05-25
申请号：US15216579
申请日：2016-07-21
Applicant: STMicroelectronics S.r.l.
Inventor： Edoardo Botti , Marco Raimondi
IPC: H04R29/00
CPC classification number: H04R29/00 , G01R27/02 , H04R5/04 , H04R29/001 , H04R2420/05
Abstract: A diagnostic circuit is used for detecting the load status of an audio amplifier. The audio amplifier includes two output terminals for connection to a speaker. The diagnostic circuit may include a first circuit, which configured to generate a first signal indicating whether a signal provided via the two output terminals comprises an audio signal. A second circuit can be configured to detect a first measurement signal being indicative for the output current provided via the two output terminals, and to compare the first measurement signal with at least one threshold in order to generate a second signal indicating whether the output current has a low current amplitude profile or a high current amplitude profile. A third circuit can be configured to generate a diagnostic signal as a function of the first and the second signal.
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12.发明授权公开(公告)号：US11848675B2
公开(公告)日：2023-12-19
申请号：US18049852
申请日：2022-10-26
Applicant: STMicroelectronics S.r.l.
Inventor： Giovanni Gonano , Marco Raimondi
Abstract: An embodiment apparatus comprises a switching-type output power stage, a modulator circuit configured for carrying out a pulse-width modulation and converting an electrical input signal into an input signal pulsed between two electrical levels, having a mean value proportional to the amplitude of the input signal, and a circuit arrangement for controlling saturation of an output signal supplied by the switching-type output power stage. The circuit arrangement comprises a pulse-remodulator circuit, between the output of the modulator circuit and the input of the switching-type output power stage, that is configured for supplying, as a driving signal to the switching-type output power stage, a respective modulated signal pulsed between two electrical levels, measuring a pulse width as pulse time interval elapsing between two consecutive pulsed-signal edges of the pulsed input signal, and, if the measurement indicates that the latter is below a given minimum value, remodulating the pulsed input signal.
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13.发明申请公开(公告)号：US20230076765A1
公开(公告)日：2023-03-09
申请号：US18049852
申请日：2022-10-26
Applicant: STMicroelectronics S.r.l
Inventor： Giovanni Gonano , Marco Raimondi
Abstract: An embodiment apparatus comprises a switching-type output power stage, a modulator circuit configured for carrying out a pulse-width modulation and converting an electrical input signal into an input signal pulsed between two electrical levels, having a mean value proportional to the amplitude of the input signal, and a circuit arrangement for controlling saturation of an output signal supplied by the switching-type output power stage. The circuit arrangement comprises a pulse-remodulator circuit, between the output of the modulator circuit and the input of the switching-type output power stage, that is configured for supplying, as a driving signal to the switching-type output power stage, a respective modulated signal pulsed between two electrical levels, measuring a pulse width as pulse time interval elapsing between two consecutive pulsed-signal edges of the pulsed input signal, and, if the measurement indicates that the latter is below a given minimum value, remodulating the pulsed input signal.
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Patent Agency Ranking
14.发明授权公开(公告)号：US11515861B2
公开(公告)日：2022-11-29
申请号：US17350216
申请日：2021-06-17
Applicant: STMicroelectronics S.r.l.
Inventor： Giovanni Gonano , Marco Raimondi
Abstract: An embodiment apparatus comprises a switching-type output power stage, a modulator circuit configured for carrying out a pulse-width modulation and converting an electrical input signal into an input signal pulsed between two electrical levels, having a mean value proportional to the amplitude of the input signal, and a circuit arrangement for controlling saturation of an output signal supplied by the switching-type output power stage. The circuit arrangement comprises a pulse-remodulator circuit, between the output of the modulator circuit and the input of the switching-type output power stage, that is configured for supplying, as a driving signal to the switching-type output power stage, a respective modulated signal pulsed between two electrical levels, measuring a pulse width as pulse time interval elapsing between two consecutive pulsed-signal edges of the pulsed input signal, and, if the measurement indicates that the latter is below a given minimum value, remodulating the pulsed input signal.
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公开(公告)号：US20190020960A1
公开(公告)日：2019-01-17
申请号：US16135624
申请日：2018-09-19
Applicant: STMicroelectronics S.r.l.
Inventor： Edoardo Botti , Marco Raimondi
Abstract: A diagnostic circuit is used for detecting the load status of an audio amplifier. The audio amplifier includes two output terminals for connection to a speaker. The diagnostic circuit may include a first circuit, which configured to generate a first signal indicating whether a signal provided via the two output terminals comprises an audio signal. A second circuit can be configured to detect a first measurement signal being indicative for the output current provided via the two output terminals, and to compare the first measurement signal with at least one threshold in order to generate a second signal indicating whether the output current has a low current amplitude profile or a high current amplitude profile. A third circuit can be configured to generate a diagnostic signal as a function of the first and the second signal.
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公开(公告)号：US10018658B2
公开(公告)日：2018-07-10
申请号：US15212200
申请日：2016-07-16
Applicant: STMicroelectronics S.r.l.
Inventor： Edoardo Botti , Marco Raimondi
CPC classification number: G01R19/10 , G01R19/0092 , H03F1/3205 , H03F1/523 , H03F3/185 , H03F3/2173 , H03F2200/03 , H03F2200/171 , H03F2200/393 , H03F2200/444 , H03F2200/456 , H03F2200/462 , H03F2200/471 , H03F2200/481
Abstract: A circuit includes a final stage that includes an H-bridge comprising first and second half-bridges. A read circuit is configured to read a load current supplied by a class-D audio-amplifier to a load. The read circuit is configured for estimating the load current by reading a current at an output by the first or second half-bridge by measuring a drain-to-source voltage during an ON period of a power transistor of the H-bridge. A sensing circuit is configured to detect a first drain-to-source voltage from a transistor of the first half-bridge and a second drain-to-source voltage from a corresponding transistor of the second half-bridge. The sensing circuit is also configured to compute a difference between the first drain-to-source voltage and the second drain-to-source voltage and to perform an averaging operation on the difference to obtain a sense voltage value to be supplied to an analog-to-digital converter.
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公开(公告)号：US20170160316A1
公开(公告)日：2017-06-08
申请号：US15212200
申请日：2016-07-16
Applicant: STMicroelectronics S.r.l.
Inventor： Edoardo Botti , Marco Raimondi
CPC classification number: G01R19/10 , H03F1/3205 , H03F1/523 , H03F3/185 , H03F3/2173 , H03F2200/03 , H03F2200/171 , H03F2200/393 , H03F2200/444 , H03F2200/456 , H03F2200/462 , H03F2200/471 , H03F2200/481
Abstract: A circuit includes a final stage that includes an H-bridge comprising first and second half-bridges. A read circuit is configured to read a load current supplied by a class-D audio-amplifier to a load. The read circuit is configured for estimating the load current by reading a current at an output by the first or second half-bridge by measuring a drain-to-source voltage during an ON period of a power transistor of the H-bridge. A sensing circuit is configured to detect a first drain-to-source voltage from a transistor of the first half-bridge and a second drain-to-source voltage from a corresponding transistor of the second half-bridge. The sensing circuit is also configured to compute a difference between the first drain-to-source voltage and the second drain-to-source voltage and to perform an averaging operation on the difference to obtain a sense voltage value to be supplied to an analog-to-digital converter.
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公开(公告)号：US09660586B2
公开(公告)日：2017-05-23
申请号：US14797934
申请日：2015-07-13
Applicant: STMICROELECTRONICS S.R.L.
Inventor： Marco Raimondi , Edoardo Botti
CPC classification number: H03F3/45932 , H03F1/0205 , H03F3/183 , H03F3/185 , H03F3/211 , H03F3/217 , H03F3/2173 , H03F2200/03 , H03F2200/129 , H03F2200/171 , H03F2200/258 , H03F2200/351 , H03F2200/78 , H03F2203/21106
Abstract: A switching amplifier includes a first half-bridge PWM modulator, a second half-bridge PWM modulator, and at least one amplifier stage configured to receive input signals. The switching amplifier also includes a PWM control stage configured to control switching of the first PWM modulator and of the second PWM modulator as a function of the input signals, by respective first PWM control signals and second PWM control signals. The amplifier stage and the PWM control stage have a fully differential structure.
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