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公开(公告)号：US20230019116A1
公开(公告)日：2023-01-19
申请号：US17935542
申请日：2022-09-26
Applicant: STMICROELECTRONICS S.R.L.
Inventor： Fabio CACCIOTTO
Abstract: A control circuit for a driving an electronic switch associated with a switching node of a flyback converter includes a comparison circuit configured to generate a switch-off signal by comparing a current measurement signal with a current measurement threshold signal. A valley detection circuit is configured to generate a trigger in a trigger signal when a valley signal indicates a valley in a voltage at the switching node of the flyback converter, and a blanking circuit is configured to generate a switch-on signal by combining the trigger signal with a timer signal provide by a timer circuit. The timer signal indicates whether a blanking time-interval has elapsed.
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2.发明公开公开(公告)号：US20230246552A1
公开(公告)日：2023-08-03
申请号：US17590751
申请日：2022-02-01
Applicant: STMICROELECTRONICS S.R.L.
Inventor： Fabio CACCIOTTO
CPC classification number: H02M3/33515 , H02M1/08
Abstract: A control circuit for an electronic converter is described. The control circuit generates a drive signal for an electronic switch of the electronic converter by setting the drive signal to a first logic level in response to a switch-on signal, thereby closing said electronic switch for a switch-on interval, and to a second logic level in response to a switch-off signal, thereby opening the electronic switch for a switch-off interval. The control circuit comprises a valley detection circuit configured to generate a trigger in a trigger signal in response to detecting a valley in the voltage at the electronic switch during the switch-off interval, and a combinational logic circuit configured to generate the switch-on signal by masking the trigger signal in response to a blanking signal. Accordingly, the control circuit comprises also a blanking circuit configured to generate the blanking signal by determining a blanking time as a function the output power provided by the electronic converter, and asserting the blanking signal when the blanking time elapses since the start of the switch-on interval or the switch-off interval. In particular, the control circuit comprises moreover a blanking time adaption circuit configured to generate a blanking time adaption signal as a function of the input voltage, and adapt the blanking time as a function of the blanking time adaption signal, wherein the blanking time adaption circuit is configured to increase the blanking time when the input voltage increases, and decrease the blanking time when the input voltage decreases.
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3.发明公开公开(公告)号：US20240039391A1
公开(公告)日：2024-02-01
申请号：US18360598
申请日：2023-07-27
Applicant: STMICROELECTRONICS S.r.l.
Inventor： Fabio CACCIOTTO
CPC classification number: H02M1/088 , H02M3/157 , H03K7/08 , H02M1/0025
Abstract: A control circuit for a switching stage of an electronic converter is described. The control circuit includes a driver circuit configured to generate one or more drive signals as a function of a Pulse-Width Modulation, PWM, signal and a PWM signal generator circuit configured to generate the PWM signal. A first comparator asserts a comparison signal when a feedback signal having a voltage being indicative of a current flowing through an inductance of the switching stage is greater than a reference signal. In response to a clock signal, a storage element asserts the PWM signal, whereby the clock signal indicates the duration of the switching period of the PWM signal. Conversely, in response to determining that the comparison signal is asserted, the storage element de-asserts the PWM signal. Specifically, the reference signal is generated as a function of the voltage at a capacitance. For this purpose, a further comparator asserts a further comparison signal, when a feedback signal having a voltage being indicative of an output quantity is smaller than the reference voltage. Moreover, a charge and discharge circuit charges the capacitance when the further comparison signal is de-asserted, and discharges the capacitance when the further comparison signal is asserted.
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公开(公告)号：US20210257914A1
公开(公告)日：2021-08-19
申请号：US17174001
申请日：2021-02-11
Applicant: STMicroelectronics S.r.l.
Inventor： Fabio CACCIOTTO
Abstract: A control circuit for a driving an electronic switch associated with a switching node of a flyback converter includes a comparison circuit configured to generate a switch-off signal by comparing a current measurement signal with a current measurement threshold signal. A valley detection circuit is configured to generate a trigger in a trigger signal when a valley signal indicates a valley in a voltage at the switching node of the flyback converter, and a blanking circuit is configured to generate a switch-on signal by combining the trigger signal with a timer signal provide by a timer circuit. The timer signal indicates whether a blanking time-interval has elapsed.
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