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1.发明公开公开(公告)号：US20230396155A1
公开(公告)日：2023-12-07
申请号：US17834174
申请日：2022-06-07
Applicant: STMicroelectronics International N.V.
Inventor： Ranajay MALLIK , Akshat JAIN
CPC classification number: H02M1/4216 , H02M1/4225 , H02M1/4233 , H02M1/12
Abstract: A PFC correction circuit includes first, second, and third phase inputs coupled to three-phase power mains, with a three-phase full-wave rectifying bridge connected to an input node. First, second, and third boost inductors are respectively connected between first, second, and third phase inputs and first, second, and third taps of the three-phase full-wave rectifying bridge. A boost switch is connected between the input node and ground, and a boost diode is connected between the input node and an output node. A multiplier input driver generates a single-phase input signal as a replica of a signal at the three-phase power mains after rectification. A single-phase power factor controller generates a PWM signal from the single-phase input signal. A gate driver generates a gate drive signal from the PWM signal. The boost switch is operated by the gate drive signal.
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公开(公告)号：US20230387783A1
公开(公告)日：2023-11-30
申请号：US18234137
申请日：2023-08-15
Applicant: STMicroelectronics International N.V.
Inventor： Akshat JAIN
IPC: H02M1/08 , H02M1/32 , H03K17/082 , H05B6/10
CPC classification number: H02M1/08 , H02M1/32 , H03K17/0828 , H05B6/108 , H02M7/04
Abstract: Methods of operating an induction geyser include drawing current through a resonant tank via a transistor, generating a changing magnetic field around the resonant tank. Owing to the strategic placement of the resonant tank in proximity to a fluid tank, the changing magnetic field envelopes the fluid tank. In a first method, the voltage across the transistor's conduction terminals is monitored, and when this voltage surpasses a predefined threshold, indicating an overvoltage condition, a corrective action is initiated in which a gate driver pulls up a gate drive signal that drives the transistor. In a second method, the current flowing between the transistor's conduction terminals is monitored, and upon detecting an overcurrent condition where the current exceeds a set threshold the gate driver is activated to pull down the gate drive signal. Both methods aim to keep operation of the geyser within desired parameters.
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公开(公告)号：US20190128960A1
公开(公告)日：2019-05-02
申请号：US15797504
申请日：2017-10-30
Applicant: STMICROELECTRONICS INTERNATIONAL N.V.
Inventor： Tejinder KUMAR , Akshat JAIN
IPC: G01R31/317 , G01R31/3177
Abstract: Various embodiments provide a parallel checker to determine whether a device under test (DUT) is functioning properly or outputting erroneous bits. A test pattern or test data is injected into the DUT, and the parallel checker compares output data of the DUT to expected data stored in the parallel checker. The parallel checker determines an error in the event that a bit in the output data does not match in the expected data. The parallel checker is independent of test pattern length and data width at the parallel input of the parallel checker. Accordingly, the parallel checker may be used for multiple different test patterns, such as a PRBS 7, a CJTPAT, CRPAT, etc. Further, the parallel checker provides high-speed synchronization between data received from the DUT and expected test data stored in the parallel checker. In addition, the parallel checker consumes relatively low power and chip area in, for example, a SoC environment.
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公开(公告)号：US20220190708A1
公开(公告)日：2022-06-16
申请号：US17685689
申请日：2022-03-03
Applicant: STMicroelectronics International N.V.
Inventor： Akshat JAIN
IPC: H02M1/08 , H02M1/42 , H05B45/44 , H05B45/375 , H05B45/18
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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Patent Agency Ranking
公开(公告)号：US20190342960A1
公开(公告)日：2019-11-07
申请号：US16514275
申请日：2019-07-17
Applicant: STMicroelectronics International N.V.
Inventor： Akshat JAIN , Ranajay MALLIK
Abstract: A circuit includes a voltage converter converting a source voltage to a supply voltage at a first node as a function of a feedback voltage at a feedback node. A first output path is coupled between the first node and a second node. Feedback circuitry compares the voltage at the second node to first and second overvoltages, and selectively couples the second node to the feedback node based thereupon. Impedance circuitry is coupled between the first node and a third node. A light emitting diode (LED) chain is coupled to the third node, and is selectively turned on and off as a function of the selective coupling of the second node to the feedback node by the feedback circuitry.
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公开(公告)号：US20210105874A1
公开(公告)日：2021-04-08
申请号：US17121374
申请日：2020-12-14
Applicant: STMicroelectronics International N.V.
Inventor： Akshat JAIN
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.
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7.发明申请公开(公告)号：US20200304019A1
公开(公告)日：2020-09-24
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：US20190379277A1
公开(公告)日：2019-12-12
申请号：US16003331
申请日：2018-06-08
Applicant: STMicroelectronics International N.V.
Inventor： Akshat JAIN
IPC: H02M1/32 , H03K17/082 , H02M1/08 , H05B6/10
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：US20190182922A1
公开(公告)日：2019-06-13
申请号：US16216174
申请日：2018-12-11
Applicant: STMicroelectronics International N.V.
Inventor： Akshat JAIN
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.
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