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1.发明授权公开(公告)号：US10585834B2
公开(公告)日：2020-03-10
申请号：US15676820
申请日：2017-08-14
Applicant: Linear Technology Holding LLC
Inventor： Jason J. Ziomek
IPC: G06F13/40
Abstract: A first circuit board includes a master device and slave devices communicating with each other via a local first I2C bus. To allow I2C networks to communicate with each other over long distances, such as up to 1200 meters, a first interface device converts the I2C data signals to encoded differential data over a twisted wire pair. A second interface device on a remote circuit board converts the differential data to data and clock signals on its local second I2C bus coupled to other slave devices on the same board. This is equivalent to the two boards sharing the same I2C bus. The interface devices pull down the serial clock line (SCL) in their local I2C bus while waiting for data, such as an acknowledge bit. The master device generates the clock signal for its local I2C bus, and the remote interface device generates the clock signal for its local I2C bus.
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公开(公告)号：US10201052B1
公开(公告)日：2019-02-05
申请号：US15712839
申请日：2017-09-22
Applicant: Linear Technology Holding, LLC
Inventor： Lucas Andrew Milner , Joshua William Caldwell
Abstract: Techniques are provided for low, or deep, dimming of a light-emitting diode (LED) load. In an example, a low dimming circuit can include a target current detector configured to provide an output indicative of a target current of a power stage of a pulse width modulated driver, and a control circuit configured to receive a PWM signal of the PWM LED driver, to control a first transition to a first state of a power switch of the power stage during an on-interval of a first PWM cycle of the PWM signal, and to control a second transition to the first state of the power switch using the output of the target current detector during an off interval of the first PWM cycle.
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公开(公告)号：US10794761B2
公开(公告)日：2020-10-06
申请号：US16186238
申请日：2018-11-09
Applicant: Linear Technology Holding LLC
Inventor： Eric Stephen Young , Qiuzhong Wu , Xin Qi
Abstract: An electronic circuit comprises an analog-to-digital converter (ADC) circuit. The ADC circuit includes a pre-amplifying transistor and a quantizer circuit. The pre-amplifying transistor includes a base, an emitter and a collector. The pre-amplifying transistor is configured to receive an input voltage at the base that varies logarithmically; and produce an output voltage at the collector according to a comparison of a reference voltage and a difference between the input voltage and a voltage at the emitter. The quantizer circuit is operatively coupled to the pre-amplifying transistor and is configured to generate a digital value for the input voltage using the output voltage produced by the pre-amplifying transistor.
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公开(公告)号：US10652035B1
公开(公告)日：2020-05-12
申请号：US16433832
申请日：2019-06-06
Applicant: Linear Technology Holding LLC
Inventor： Gitesh Bhagwat
Abstract: In a PoE system, DC power is transmitted over two wire pairs. The primary winding of an isolation transformer is connected across the differential I/O terminals of a first PHY (a transceiver). A positive voltage output of a power supply is connected to a center tap of the secondary winding, and the secondary winding is coupled across a first wire pair. In this way, differential data and DC power is supplied to the first wire pair. A CMC is connected between the secondary winding and an autotransformer which is also connected across the first wire pair. A center tap of the autotransformer is also connected to the positive voltage output of the power supply, so that the current to the powered device is shared by the isolation transformer and the autotransformer. A similar circuit, with a second PHY, is used for the DC power return path.
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公开(公告)号：US10547241B1
公开(公告)日：2020-01-28
申请号：US16116797
申请日：2018-08-29
Applicant: LINEAR TECHNOLOGY HOLDING LLC
Inventor： Jian Li , Jindong Zhang
Abstract: A hybrid power converter includes a primary switching circuit, an LC circuit, and a secondary switching circuit. The primary switching circuit includes three or more switching transistors in series that may turn on or off according to a switching cycle to generate a series of voltage pulses at a connecting node between two switching transistors. The LC circuit may be coupled via the to the secondary switching circuits to the connecting node of the primary switching circuit. The LC circuit may receive, from the primary switching circuit, a series of pulses via the secondary switching circuits and may generate an inductor current in the LC circuit. The inductor current may charge a capacitor of the LC circuit to generate an output voltage of the hybrid power converter. The output voltage may have a reverse polarity with respect to an input voltage that may be coupled to the primary switching circuit.
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Patent Agency Ranking
公开(公告)号：US10528501B2
公开(公告)日：2020-01-07
申请号：US15727561
申请日：2017-10-06
Applicant: Linear Technology Holding LLC
Inventor： Michael David Petersen , Raymond Allen Stevens
IPC: G06F13/36 , G06F13/362 , G06F13/42 , G06F1/32 , G06F11/07
Abstract: Methods and systems of synchronizing events using a plurality of sequencing controllers are provided. For each sequencing controller, a serial communication bus (SCB) is monitored for a first reference level. Upon identifying that the SCB is at the first reference level for a predetermined period, a bit sequence indicative of an event position is broadcast to be arbitrated on the SCB. The SCB is monitored for the arbitrated bit sequence. Upon determining that the arbitrated bit sequence corresponds to the bit sequence of the event position, an event corresponding to the event position is enabled.
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公开(公告)号：US10175278B1
公开(公告)日：2019-01-08
申请号：US15960246
申请日：2018-04-23
Applicant: Linear Technology Holding LLC
Inventor： Vikas V. Paduvalli
Abstract: An output capacitor of a switching converter filters the triangular current waveform output by an inductor. An auxiliary capacitor, having a capacitance that is much smaller than a capacitance of the output capacitor, is coupled in parallel with the output capacitor so as to conduct a portion of the inductor current. A slope detector circuit determines a slope of the auxiliary capacitor current, and outputs a slope signal corresponding to the slope. A process circuit receives the slope signal and a signal corresponding to the inductor current. Since the auxiliary capacitor current slope is known, along with the auxiliary capacitance value and inductor current, the process circuit can derive the value of the output capacitor by applying a scaling factor. The derived value can be used to dynamically tweak the compensation of the feedback loop or identify a failure of the output capacitor.
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公开(公告)号：US10136488B1
公开(公告)日：2018-11-20
申请号：US15726154
申请日：2017-10-05
Applicant: Linear Technology Holding, LLC
Inventor： Dongwon Kwon , Joshua William Caldwell
Abstract: Techniques are provided for low, or deep, dimming of a light-emitting diode (LED) load. In an example, a method of adjusting an initial voltage of a driver circuit for an LED load can include providing current to an LED load from a power stage of the driver during an on-time of a pulse-width modulation (PWM) cycle, receiving error current information of the driver circuit at a low-dimming control circuit of the driver, and adjusting a voltage of an output capacitor coupled to the driver during an off-time of the PWM cycle, the charge adjustment based on the error current information.
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公开(公告)号：US10135340B1
公开(公告)日：2018-11-20
申请号：US15701380
申请日：2017-09-11
Applicant: Linear Technology Holding LLC
Inventor： David James Megaw
IPC: H02M3/158
Abstract: A controller may control a buck-boost regulator having an input voltage and an output voltage. The controller may include: circuitry that causes the output voltage of the buck-boost regulator to be at the bottom of a pre-determined voltage window when the input voltage goes below the bottom of the pre-determined voltage window: circuitry that causes the output voltage of the buck-boost regulator to be at the top of the pre-determined voltage window when the input voltage goes above the top of the pre-determined voltage window; and circuitry that causes the buck-boost regulator to pass the input voltage through the buck-boost regulator so as to cause the voltage output of the buck-boost regulator to be at the same level as the input voltage when the input voltage is within the pre-determined voltage window.
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公开(公告)号：US10693373B2
公开(公告)日：2020-06-23
申请号：US16112593
申请日：2018-08-24
Applicant: LINEAR TECHNOLOGY HOLDING LLC
Inventor： Jian Li , San-Hwa Chee
Abstract: A hybrid power converter includes a switching circuit, an LC circuit, and a detection circuit. The switching circuit includes three or more switching transistors in series that may turn on or off according to a switching cycle to generate a series of voltage pulses at an output port across one of the switching transistors. The LC circuit may be coupled to the output port of the switching circuit to receive the series of pulses and to generate an inductor current in the LC circuit. The inductor current may charge a capacitor of the LC circuit to generate an output voltage of the hybrid power converter. The detection circuit may be coupled to the switching circuit and may generate a low frequency portion of the inductor current based on one or more currents of the switching transistors to adjust the switching cycle based at least on the low frequency portion.
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