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    LED control and driving circuit capable of both analog and digital dimming
    11.
    发明授权
    LED control and driving circuit capable of both analog and digital dimming 有权

    公开(公告)号：US11296591B2

    公开(公告)日：2022-04-05

    申请号：US17121374

    申请日：2020-12-14

    Applicant: STMicroelectronics International N.V.

    Inventor： Akshat Jain

    IPC: H05B45/18 ,  H05B45/355 ,  H02M1/08 ,  H02M1/42 ,  H05B45/44 ,  H05B45/375 ,  H02M1/00

    Abstract: A LED driving circuit includes a power factor correction circuit receiving a rectified mains voltage and providing output to a DC voltage bus, a string of LEDs connected in series, a voltage converter receiving input from the DC voltage bus and providing output to the string of LEDs, and a microcontroller. The microcontroller receives a plurality of digital feedback signals from the voltage converter, controls the voltage converter based upon a user desired brightness level and the plurality of digital feedback signals, and receive a plurality of feedback signals from the power factor correction circuit. Based on the plurality of feedback signals, the microcontroller operates the power factor correction circuit in transition mode where the user desired brightness level is above a threshold brightness, and operates the power factor correction circuit in discontinuous mode where the user desired brightness level is below the threshold brightness.

    PEAK EFFICIENCY TRACKING IN AN LLC CONVERTER OF A MULTI-STAGE POWER CONVERSION SYSTEM
    12.
    发明申请
    PEAK EFFICIENCY TRACKING IN AN LLC CONVERTER OF A MULTI-STAGE POWER CONVERSION SYSTEM 有权

    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.

    LED control and driving circuit capable of both analog and digital dimming
    13.
    发明授权
    LED control and driving circuit capable of both analog and digital dimming 有权

    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.

    Enhancing high-voltage startup voltage rating for PWM controllers with internal high voltage startup circuit
    14.
    发明授权
    Enhancing high-voltage startup voltage rating for PWM controllers with internal high voltage startup circuit 有权

    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

    IPC: H02M1/36 ,  H02M1/42 ,  H02M1/00

    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.

    Control circuitry for increasing power output in quasi-resonant converters
    15.
    发明授权
    Control circuitry for increasing power output in quasi-resonant converters 有权

    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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