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公开(公告)号：US20210384813A1
公开(公告)日：2021-12-09
申请号：US16892385
申请日：2020-06-04
Inventor： Akshat Jain , Ivan Clemente Massimiani
Abstract: A driving circuit including a reference voltage generator to generate a reference voltage based on an operating frequency of a complementary circuit; a comparator including a first input configured to receive a drain-to-source voltage of a field effect transistor; and a second input to receive the reference voltage; and a signal generator to deliver a driving signal to a gate terminal of the field effect transistor to drive the field effect transistor to an ON state after the drain-to-source voltage of the first low side field effect transistor becomes less than the reference voltage and to an OFF state after the drain-to-source voltage of the field effect transistor becomes greater than the reference voltage.
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公开(公告)号：US20250055376A1
公开(公告)日：2025-02-13
申请号：US18232185
申请日：2023-08-09
Applicant: STMicroelectronics International N.V.
Inventor： Ranajay Mallik , Akshat Jain
IPC: H02M3/335 , H02M1/00 , H02M3/00 , H02M7/5387
Abstract: According to an embodiment, an LLC resonant converter includes a switching bridge having a plurality of power switches. The switching bridge is configured to receive a DC voltage input and generate a square waveform based on a pulse-modulated frequency (PFM) signal at the switching bridge. The LLC resonant converter further includes a resonant tank circuit coupled to the switching bridge. The resonant tank circuit includes a resonant inductor. The resonant tank circuit is excited in response to receiving the square waveform. The PFM signal is adjusted such that an elapsed time between a rising edge of a Drain-Source Voltage of a power switch and a zero-crossing point of current flowing through the resonant inductor falls within a predetermined range corresponding to the resonant tank circuit operating at its resonant frequency.
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Patent Agency Ranking
公开(公告)号：US12212228B2
公开(公告)日：2025-01-28
申请号：US17685689
申请日：2022-03-03
Applicant: STMicroelectronics International N.V.
Inventor： Akshat Jain
IPC: H05B45/355 , H02M1/08 , H02M1/42 , H05B45/18 , H05B45/375 , H05B45/44 , H02M1/00
Abstract: A method includes receiving a plurality of digital feedback signals from a voltage converter, controlling the voltage converter based upon a user desired brightness level and the plurality of digital feedback signals, the voltage converter receiving input from a DC voltage bus and providing output to drive a lighting load, and receiving a plurality of feedback signals from a power factor correction circuit that receives a rectified mains voltage and provides output to the DC voltage bus, and based thereupon operating the power factor correction circuit in transition mode or discontinuous mode based upon the user desired brightness level and a threshold brightness. The plurality of feedback signals include an input sense signal that is a function of the rectified mains voltage as drawn by the power factor correction circuit and an output sense signal that is a function of the output provided to the DC voltage bus.
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14.发明授权公开(公告)号：US11165334B2
公开(公告)日：2021-11-02
申请号：US16801370
申请日：2020-02-26
Applicant: STMicroelectronics International N.V.
Inventor： Akshat Jain , Saurabh Sona
Abstract: A power supply has a transformer with primary and secondary windings. A first terminal of the primary-winding is coupled to a power-input. A PFC includes a low-voltage circuit correcting power factor of the power signal, having a supply-input receiving a supply voltage during normal operation, a feedback-input coupled to a first terminal of the secondary-winding, and a gate-drive-output. A high-voltage startup circuit powers the low-voltage circuit during startup. Periphery circuitry includes a transient voltage suppression diode having an anode coupled to supply power to the high-voltage startup circuit and a cathode coupled to the power-input, a diode having an anode coupled to the first terminal of the secondary-winding and a cathode coupled to the supply-input of the low-voltage circuit. A capacitor is coupled between the supply-input and ground. A transistor has a drain coupled to a second terminal of the primary-winding and a gate coupled to the gate-drive-output.
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公开(公告)号：US10778082B2
公开(公告)日：2020-09-15
申请号：US16003331
申请日：2018-06-08
Applicant: STMicroelectronics International N.V.
Inventor： Akshat Jain
IPC: H05B6/06 , H05B6/12 , H02H3/20 , H02H7/10 , H02M1/32 , H03K17/082 , H05B6/10 , H02M1/08 , H02M7/04
Abstract: Disclosed herein is a circuit including a transistor, with a resonant tank coupled between a DC supply node and a first conduction terminal of the transistor. A gate driver generates a gate drive signal for biasing a control terminal of the transistor to cause it to conduct current through the resonant tank. Control circuitry monitors a voltage across the transistor to determine that the transistor is an overvoltage condition if that voltage exceeds a threshold, and monitors a current through the transistor to determine that the transistor is an overcurrent condition if that current exceeds a threshold. If overvoltage is determined, the control circuitry causes the gate driver to pull up the gate drive signal. If overcurrent is determined, the control circuitry causes the gate driver to pull down the gate drive signal. If either overvoltage or overcurrent is present, a pulse width of the gate drive signal is reduced.
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公开(公告)号：US10405384B2
公开(公告)日：2019-09-03
申请号：US16106593
申请日：2018-08-21
Applicant: STMicroelectronics International N.V.
Inventor： Akshat Jain , Ranajay Mallik
Abstract: A circuit includes a voltage converter converting source voltage to supply voltage at a first node as a function of a feedback voltage at a feedback node. A first output path is coupled between first and second node nodes. Feedback circuitry couples the second node to the feedback node when a voltage at the second node exceeds a first overvoltage, in a first mode of operation. The feedback circuitry couples the second node to the feedback node when the voltage at the second node exceeds a second overvoltage less than the first overvoltage, in a second mode of operation. Impedance circuitry is coupled between the first node and a third node and generates an auxiliary supply voltage and an auxiliary ground voltage when the circuit is in both the first and second modes, the auxiliary supply voltage being less than the supply voltage in both the first and second modes.
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公开(公告)号：US20190059135A1
公开(公告)日：2019-02-21
申请号：US16106593
申请日：2018-08-21
Applicant: STMicroelectronics International N.V.
Inventor： Akshat Jain , Ranajay Mallik
IPC: H05B33/08
CPC classification number: H05B33/0815 , H02M1/08 , H02M3/156 , H02M2001/0006 , H02M2001/0025 , H02M2001/0032 , H05B33/0809 , H05B33/0851
Abstract: A circuit includes a voltage converter converting source voltage to supply voltage at a first node as a function of a feedback voltage at a feedback node. A first output path is coupled between first and second node nodes. Feedback circuitry couples the second node to the feedback node when a voltage at the second node exceeds a first overvoltage, in a first mode of operation. The feedback circuitry couples the second node to the feedback node when the voltage at the second node exceeds a second overvoltage less than the first overvoltage, in a second mode of operation. Impedance circuitry is coupled between the first node and a third node and generates an auxiliary supply voltage and an auxiliary ground voltage when the circuit is in both the first and second modes, the auxiliary supply voltage being less than the supply voltage in both the first and second modes.
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