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公开(公告)号：US12301111B2
公开(公告)日：2025-05-13
申请号：US18089736
申请日：2022-12-28
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Alberto Cattani , Alessandro Gasparini
Abstract: A supply node receives supply voltage and an output node provides a regulated output voltage to a load. A switching transistor is coupled between the supply and output nodes. The switching transistor is controlled by a drive signal generated by a control circuit to control switching activity. The control circuit includes circuitry to sense a feedback voltage indicative of the regulated output voltage and a comparator generating a comparison logic signal dependent on a comparison of the feedback voltage to a reference. A logic circuit generates a skip signal in response to the comparison logic signal. A counter generates a termination signal. Signal processing circuitry controls the switching activity by asserting the drive signal as a function of the skip signal and the termination signal.
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公开(公告)号：US11626799B2
公开(公告)日：2023-04-11
申请号：US17393243
申请日：2021-08-03
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Alberto Cattani , Stefano Ramorini , Alessandro Gasparini
Abstract: A converter circuit includes first and second electronic switches coupled at an intermediate node, with an inductor coupled between the intermediate node and an output node. Switching drive control circuitry causes the first and the second electronic switch to switch between a conductive state and a non-conductive state. The drive control circuitry includes a first feedback signal path to control switching of the first and the second electronic switch as a function of the difference between a feedback signal indicative of the signal at the output node and a reference value. A second feedback signal path includes a low-pass filter coupled to the output node and configured to provide a low-pass filtered feedback signal resulting from low-pass filtering of the output signal. The second feedback signal path compensates the feedback signal as a function of the difference between the low-pass filtered feedback signal and a respective reference value.
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公开(公告)号：US12062981B2
公开(公告)日：2024-08-13
申请号：US17569296
申请日：2022-01-05
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Gasparini , Alessandro Bertolini , Mauro Leoncini , Massimo Ghioni , Salvatore Levantino
CPC classification number: H02M3/158 , H02M1/0009 , H02M1/0025
Abstract: A time based boost DC-DC converter generates an output voltage using an inductor. A voltage error between the output voltage and a reference voltage is determined and processed in a) an integral control branch which converts the voltage error into an integral control current signal used to control a current controlled oscillator, and b) a proportional branch which converts the voltage error into a proportional control current signal used to control signal a delay line. Current flowing in the inductor is sensed, attenuated and used to apply adjustment to the integral and proportional control current signals. The output from the current controlled oscillator is passed through the delay line and phase detected in order to generate pulse width modulation (PWM) control signaling driving switch operation in the converter.
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公开(公告)号：US12267047B2
公开(公告)日：2025-04-01
申请号：US17720502
申请日：2022-04-14
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Germano Nicollini
Abstract: An amplifier circuit includes a first input stage with a differential input transistor pair and a second gain stage having an output node coupled to a load. A node in the first gain stage is coupled to the output node in the second gain stage. A feedback line couples the output node to the control node of a first transistor of the differential input transistor pair. Current mirror circuitry is coupled to a current flow path through a further transistor in the second gain stage and includes a sensing node configured to produce a sensing signal indicative of the current supplied to the load. The sensing signal at the sensing node is directly fed back to the control node of the first transistor of the differential input transistor pair to provide a zero in the loop transfer function that is matched to and tracks and cancels out a load-dependent pole.
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公开(公告)号：US11527956B2
公开(公告)日：2022-12-13
申请号：US17335523
申请日：2021-06-01
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Alberto Cattani , Alessandro Gasparini
Abstract: A control circuit for controlling switching operation of a switching stage of a converter includes a phase detector circuit that generates a pulse-width modulated (PWM) signal in response to a phase comparison of two clock signals. A first clock signal has a frequency determined as a function of a first feedback signal proportional to converter output voltage. A first transconductance amplifier generates a first current indicative of a difference between a reference voltage and the first feedback signal, and a second transconductance amplifier generates a second current indicative of a difference between the reference voltage and a second feedback signal proportional to a derivative of the converter output voltage. A delay line introduces a delay in the first clock signal that is dependent on the first and second currents as well as a compensation current dependent on a selected operational mode of the converter.
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Patent Agency Ranking
公开(公告)号：US10680521B1
公开(公告)日：2020-06-09
申请号：US16555262
申请日：2019-08-29
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Alberto Cattani
Abstract: An inductor and a shunt switch circuit are connected in parallel between an input node and an intermediate node. A first power transistor is connected between the intermediate node and a ground node. A second power transistor is connected between the intermediate node and an output node. The first and second power transistors are driven in response to a pulse width modulation (PWM) drive cycle having an on-time and an off-time. The input node receives a DC input voltage and a DC output voltage is generated at the output node. A control circuit senses the input and output nodes and determines whether the DC input voltage is within a threshold voltage of the DC output voltage. In response to that determination, the shunt switch circuit is turned on only during the off-time of the PWM drive cycle.
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公开(公告)号：US12212235B2
公开(公告)日：2025-01-28
申请号：US17671163
申请日：2022-02-14
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Alberto Cattani , Stefano Ramorini , Alessandro Gasparini
Abstract: A control circuit operates to control a switching stage of an electronic converter. The control circuit includes: first terminals providing drive signals to electronic switches of the switching stage; a second terminal receiving from a feedback circuit a first feedback signal proportional to a converter output voltage; and a third terminal configured to receive from a current sensor a second feedback signal proportional to an inductor current. A driver circuit provides the drive signals as a function of a PWM signal generated by a generator circuit as a function of the first and second feedback signals, a reference voltage and a slope compensation signal. A mode selection signal is generated as a function of a comparison between the input voltage and the output voltage. A feed-forward compensation circuit is configured to source and/or sink a compensation current as a function of a variation in the mode selection signal.
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公开(公告)号：US12191869B2
公开(公告)日：2025-01-07
申请号：US17982712
申请日：2022-11-08
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Alberto Cattani , Alessandro Gasparini
Abstract: In a control circuit for a switching stage of an electronic converter, a phase detector generates a drive signal in response to a phase difference between first and second clock signals. The first and second clock signals are generated by first and second current-controlled oscillators, respectively. An operational transconductance amplifier generates first and second control currents in response to a difference between a reference and a feedback of the electronic converter, with the first and second currents applied to control the first and second current-controlled oscillators. In response to a switching clock having a first state, a switching circuit applies first and second bias currents to the control inputs of the first and second current-controlled oscillators, respectively. Conversely, in response to the switching clock having a second state, the switching circuit applies the second and first bias currents to the control inputs of the first and second current-controlled oscillators, respectively.
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公开(公告)号：US12301093B2
公开(公告)日：2025-05-13
申请号：US18758327
申请日：2024-06-28
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Gasparini , Alessandro Bertolini , Mauro Leoncini , Massimo Ghioni , Salvatore Levantino
Abstract: A time based boost DC-DC converter generates an output voltage using an inductor. A voltage error between the output voltage and a reference voltage is determined and processed in a) an integral control branch which converts the voltage error into an integral control current signal used to control a current controlled oscillator, and b) a proportional branch which converts the voltage error into a proportional control current signal used to control signal a delay line. Current flowing in the inductor is sensed, attenuated and used to apply adjustment to the integral and proportional control current signals. The output from the current controlled oscillator is passed through the delay line and phase detected in order to generate pulse width modulation (PWM) control signaling driving switch operation in the converter.
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公开(公告)号：US11469665B2
公开(公告)日：2022-10-11
申请号：US17147123
申请日：2021-01-12
Applicant: STMicroelectronics S.r.l.
Inventor： Alessandro Bertolini , Alberto Cattani , Alessandro Gasparini
Abstract: A switching converter includes a voltage conversion circuit providing an output voltage from an input voltage and a PWM voltage generated in response to first and second oscillating voltages. The input stage of a transconductor circuit provides an input reference current following a difference between a reference voltage and a voltage dependent on the output voltage and according to a transconductance, and an output stage for providing an output reference current from the input reference current. A phase shifter shifts an oscillating reference voltage according to the output reference current to obtain the first and second oscillating voltages. The transconductance is controlled in response to the input voltage resulting in a change of the input reference current. Compensation for that change is provided by subtracting a variable compensation current from the input reference current, where the variable compensation current is generated in response to the input voltage.
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