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公开(公告)号：US12190909B2
公开(公告)日：2025-01-07
申请号：US18300806
申请日：2023-04-14
Applicant: STMicroelectronics S.r.l.
Inventor： Ezio Galbiati , Maurizio Ricci
IPC: G11B19/20
Abstract: A method includes coupling an electric motor in a hard disk drive to a set of driver circuits. Each driver circuit includes a high-side switch and a low-side switch. The high-side switch has a high-side current flow path between a supply node coupled to a supply voltage and a switching node coupled to a winding of the electric motor. The low-side switch has a low-side current flow path between the switching node and ground. Respective conduction currents are generated through the low-side current flow paths, in response to a command to reduce the motor speed by coupling a drive voltage to the control terminals of the low-side switches. An intensity of at least one of the respective conduction currents is sensed. In response to the sensed current intensity exceeding a current intensity threshold, the control terminals of the low-side switches are coupled to respective ones of the switching nodes.
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公开(公告)号：US11757346B2
公开(公告)日：2023-09-12
申请号：US17370674
申请日：2021-07-08
Applicant: STMicroelectronics S.r.l.
Inventor： Maurizio Ricci , Marco Sautto , Simone Bellisai , Eleonora Chiaramonte , Luigi Arpini , Davide Betta
CPC classification number: H02M1/008 , H02M1/0025 , H02M3/156 , H02M3/157 , H02M3/158
Abstract: An embodiment circuit comprises first and second output nodes with an inductor arranged therebetween, and first and second switches coupled to opposed ends of the inductor. The switches are switchable between non-conductive and conductive states to control current flow through the inductor and produce first and second output voltages. The current intensity through the inductor is compared with at least one reference value. Switching control circuitry is coupled with the first and second switches, the first and second output nodes, and current sensing circuitry, which is configured to control the switching frequency of the first and second switches as a function of the output voltages and a comparison at the current sensing circuitry. The switching control circuitry is configured to apply FLL-FFWD processing to produce the reference values as a function of a timing signal, targeting maintaining a constant target value for the converter switching frequency.
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公开(公告)号：US20220021306A1
公开(公告)日：2022-01-20
申请号：US17370674
申请日：2021-07-08
Applicant: STMicroelectronics S.r.l.
Inventor： Maurizio Ricci , Marco Sautto , Simone Bellisai , Eleonora Chiaramonte , Luigi Arpini , Davide Betta
Abstract: An embodiment circuit comprises first and second output nodes with an inductor arranged therebetween, and first and second switches coupled to opposed ends of the inductor. The switches are switchable between non-conductive and conductive states to control current flow through the inductor and produce first and second output voltages. The current intensity through the inductor is compared with at least one reference value. Switching control circuitry is coupled with the first and second switches, the first and second output nodes, and current sensing circuitry, which is configured to control the switching frequency of the first and second switches as a function of the output voltages and a comparison at the current sensing circuitry. The switching control circuitry is configured to apply FLL-FFWD processing to produce the reference values as a function of a timing signal, targeting maintaining a constant target value for the converter switching frequency.
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公开(公告)号：US12080327B2
公开(公告)日：2024-09-03
申请号：US18354797
申请日：2023-07-19
Applicant: STMicroelectronics S.r.l.
Inventor： Ezio Galbiati , Michele Boscolo Berto , Giuseppe Maiocchi , Maurizio Ricci
Abstract: An embodiment method includes rectifying a back electromotive force of a spindle motor in a hard disk drive and energizing a voice coil motor in the hard disk drive using the rectified back electromotive force of the spindle motor via a voice coil motor power stage to retract a head of the hard disk drive to a park position. The head is retracted by moving the head towards the park position during a first retract phase and retaining the head in the park position during a second retract phase by applying a bias voltage to the voice coil motor power stage during a bias interval of the second retract phase. The method also includes producing a saturation signal indicative of onset of saturation in the voice coil motor power stage and controlling the bias voltage during the second retract phase.
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公开(公告)号：US12027964B2
公开(公告)日：2024-07-02
申请号：US18364811
申请日：2023-08-03
Applicant: STMicroelectronics S.r.l.
Inventor： Maurizio Ricci , Marco Sautto , Simone Bellisai , Eleonora Chiaramonte , Luigi Arpini , Davide Betta
CPC classification number: H02M1/008 , H02M1/0025 , H02M3/156 , H02M3/157 , H02M3/158 , H02M1/0003
Abstract: An embodiment circuit comprises first and second output nodes with an inductor arranged therebetween, and first and second switches coupled to opposing ends of the inductor. The switches are switchable between non-conductive and conductive states to control current flow through the inductor and produce first and second output voltages. The current intensity through the inductor is compared with at least one reference value. Switching control circuitry is coupled with the first and second switches, the first and second output nodes, and current sensing circuitry, which is configured to control the switching frequency of the first and second switches as a function of the output voltages and a comparison at the current sensing circuitry. The switching control circuitry is configured to apply FLL-FFWD processing to produce the reference values as a function of a timing signal, targeting maintaining a constant target value for the converter switching frequency.
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Patent Agency Ranking
公开(公告)号：US20240038263A1
公开(公告)日：2024-02-01
申请号：US18354797
申请日：2023-07-19
Applicant: STMicroelectronics S.r.l.
Inventor： Ezio Galbiati , Michele Boscolo Berto , Giuseppe Maiocchi , Maurizio Ricci
Abstract: An embodiment method includes rectifying a back electromotive force of a spindle motor in a hard disk drive and energizing a voice coil motor in the hard disk drive using the rectified back electromotive force of the spindle motor via a voice coil motor power stage to retract a head of the hard disk drive to a park position. The head is retracted by moving the head towards the park position during a first retract phase and retaining the head in the park position during a second retract phase by applying a bias voltage to the voice coil motor power stage during a bias interval of the second retract phase. The method also includes producing a saturation signal indicative of onset of saturation in the voice coil motor power stage and controlling the bias voltage during the second retract phase.
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公开(公告)号：US20230352050A1
公开(公告)日：2023-11-02
申请号：US18300806
申请日：2023-04-14
Applicant: STMicroelectronics S.r.l.
Inventor： Ezio Galbiati , Maurizio Ricci
IPC: G11B19/20
CPC classification number: G11B19/2072
Abstract: A method includes coupling an electric motor in a hard disk drive to a set of driver circuits. Each driver circuit includes a high-side switch and a low-side switch. The high-side switch has a high-side current flow path between a supply node coupled to a supply voltage and a switching node coupled to a winding of the electric motor. The low-side switch has a low-side current flow path between the switching node and ground. Respective conduction currents are generated through the low-side current flow paths, in response to a command to reduce the motor speed by coupling a drive voltage to the control terminals of the low-side switches. An intensity of at least one of the respective conduction currents is sensed. In response to the sensed current intensity exceeding a current intensity threshold, the control terminals of the low-side switches are coupled to respective ones of the switching nodes.
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公开(公告)号：US11652479B2
公开(公告)日：2023-05-16
申请号：US17659226
申请日：2022-04-14
Applicant: STMicroelectronics S.r.l.
Inventor： Giuseppe Maiocchi , Ezio Galbiati , Michele Boscolo Berto , Maurizio Ricci
IPC: H03K17/687 , H02M3/157 , H02M1/00
CPC classification number: H03K17/6877 , H02M1/0025 , H02M3/157 , H03K17/6874
Abstract: A method of controlling a half-bridge circuit includes receiving an analog feedback signal proportional to an output of the half-bridge circuit, comparing the received analog feedback signal with a threshold value, selecting a digital feedback signal based on a result of the comparing, comparing the digital feedback signal with a digital reference signal to generate a digital error signal, integrating the digital error signal to generate an integration error signal, downscaling the integral error signal to generate a downscaled integration signal, sampling the downscaled integration signal to generate a sampled integration signal, and generating pulsed signals from the sampled integration signal to provide an input to the half-bridge circuit.
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公开(公告)号：US11336280B2
公开(公告)日：2022-05-17
申请号：US17150156
申请日：2021-01-15
Applicant: STMicroelectronics S.r.l.
Inventor： Giuseppe Maiocchi , Ezio Galbiati , Michele Boscolo Berto , Maurizio Ricci
IPC: H03K17/687 , H02M3/157 , H02M1/00
Abstract: A half-bridge control circuit comprises an input terminal, an output terminal for providing a pulsed signal to a half-bridge driver circuit configured to drive two electronic switches connected between two supply terminals, and a feedback terminal for receiving a feedback signal indicative of the instantaneous voltage value at a switching node between the two electronic switches. A selector circuit provides a digital feedback signal. A subtractor generates an error signal by subtracting the digital feedback signal from the reference signal. An integrator generates an integration signal by integrating the value of the error signal. A down-scale circuit generates a reduced resolution integration signal by discarding one or more least significant bits of the integration signal. A sampling circuit generates a sampled integration signal by sampling the reduced resolution integration signal. A pulse generator circuit generates the pulsed signal as a function of the sampled integration signal.
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公开(公告)号：US20210226624A1
公开(公告)日：2021-07-22
申请号：US17150156
申请日：2021-01-15
Applicant: STMicroelectronics S.r.l.
Inventor： Giuseppe Maiocchi , Ezio Galbiati , Michele Boscolo Berto , Maurizio Ricci
IPC: H03K17/687
Abstract: An embodiment half-bridge control circuit comprises an input terminal, an output terminal for providing a pulsed signal to a half-bridge driver circuit configured to drive two electronic switches connected between two supply terminals, and a feedback terminal for receiving a feedback signal indicative of the instantaneous voltage value at a switching node between the two electronic switches. A selector circuit provides a digital feedback signal. A subtractor generates an error signal by subtracting the digital feedback signal from the reference signal. An integrator generates an integration signal by integrating the value of the error signal. A down-scale circuit generates a reduced resolution integration signal by discarding one or more least significant bits of the integration signal. A sampling circuit generates a sampled integration signal by sampling the reduced resolution integration signal. A pulse generator circuit generates the pulsed signal as a function of the sampled integration signal.
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