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公开(公告)号：US20250070795A1
公开(公告)日：2025-02-27
申请号：US18455313
申请日：2023-08-24
Inventor： Ross C. MORGAN , Michael ROBINSON
Abstract: This application relates to methods and apparatus for voltage monitoring of switching drivers. A modulator is configured to receive a modulator input signal and to controlling switching of an output stage of the switching driver to generate a first drive signal. A voltage monitor is configured to receive a first digital signal tapped from the modulator and to generate an indication of output voltage of the first drive signal from the first digital signal by controllably applying an adjustment from the first digital signal to compensate for inaccuracy between the first digital signal and the output voltage. The adjustment is based on monitored operation of the modulator. In some cases the monitored operation may be clipping of the switching driver. In some cases the monitored operation may be a signal generated by the modulator that include a contribution from a feedback signal of output voltage.
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公开(公告)号：US20250055370A1
公开(公告)日：2025-02-13
申请号：US18448527
申请日：2023-08-11
Inventor： Ross C. MORGAN
Abstract: This application relates to switching drivers which receive a supply voltage that can vary in use. An output stage switches a driver output node between switching voltages with a controlled duty-cycle and is operable in different driver modes in which the switching voltages are different in the different driver modes. A capacitive voltage generator is operable to generate a switching voltage used in one of the driver modes. The switching driver is operable a first regime, in which a capacitor of the voltage generator is biased to a capacitor voltage with a magnitude greater than the input supply voltage, or a second regime, where the biasing of the capacitor is different, such that the capacitor voltage magnitude has a ratio to the input supply voltage with a lower value than in the first regime. The regime is controlled based on the magnitude of the supply voltage and/or the capacitor voltage.
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公开(公告)号：US20250147078A1
公开(公告)日：2025-05-08
申请号：US18590241
申请日：2024-02-28
Inventor： Hemant SHUKLA , Sven SOELL , Paul WILSON , Deep SAXENA , Beata K. KUBIAK , Ross C. MORGAN , Malcolm BLYTH , Angus BLACK
Abstract: A current sensing system for sensing current through first and second circuit elements of a circuit in which the first and second circuit elements are active in respective first and second phases of an operational cycle of the circuit, the current sensing system comprising: first current sensing circuitry for sensing a current through the first circuit element; second current sensing circuitry for sensing a current through the second circuit element; and summation circuitry coupled to an output of the first current sensing circuitry and an output of the second current sensing circuitry, wherein the summation circuitry is configured to output a summation signal indicative of a sum of the sensed current through the first circuit element and the sensed current through the second circuit element so as to provide an indication of a total current drawn over an operational cycle of the circuit.
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公开(公告)号：US20240322817A1
公开(公告)日：2024-09-26
申请号：US18188053
申请日：2023-03-22
Inventor： Ross C. MORGAN , Yongjie CHENG , Lingli ZHANG
IPC: H03K17/687 , H03K17/06
CPC classification number: H03K17/6871 , H03K17/063 , H03K2217/0045
Abstract: This application relates to methods and apparatus for driving a transducer connected between two output nodes in a bridge-tied-load configuration. A driver receives first and second supply voltages and has charge pumps that generate respective first and second boosted voltages. The driver is operable a first driver mode in which each output node is modulated between the first and second supply voltage; a second driver mode in which one output nodes is modulated between the first and second supply voltages and the other output node is modulated between either the first boosted voltage and the first supply voltage or between the second supply voltage and the second boosted voltage; and a third driver mode in which one of the output nodes is modulated between the first supply voltage and the first boosted voltage and the other output node is modulated between the second supply voltage and the second boosted voltage.
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公开(公告)号：US20230216515A1
公开(公告)日：2023-07-06
申请号：US18182020
申请日：2023-03-10
Inventor： Ross C. MORGAN , Tahir RASHID , Jonathan TAYLOR
CPC classification number: H03M1/1071 , G05F3/262 , H02J7/0063 , H02J7/007182 , H02M3/156 , H02P7/29 , H02P7/295 , H03K7/08 , H03M1/504
Abstract: The present disclosure relates to circuitry comprising: digital circuitry configured to generate a digital output signal; and monitoring circuitry configured to monitor a supply voltage to the digital circuitry and to output a control signal for controlling operation of the digital circuitry, wherein the control signal is based on the supply voltage.
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Patent Agency Ranking
公开(公告)号：US20240323601A1
公开(公告)日：2024-09-26
申请号：US18188085
申请日：2023-03-22
Inventor： Ross C. MORGAN , Roberto NAPOLI , Kemal S. DEMIRCI , Thomas H. HOFF
CPC classification number: H04R3/007 , H04R29/001 , H04R2430/01
Abstract: This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a transducer has a switching driver configured to switch at least one output node between different switching voltages with a controlled duty-cycle to drive an output signal across the transducer. A clipping prevention controller is configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping of the output signal. The clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of load resistance of the transducer and the input voltage to the switching driver.
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公开(公告)号：US20220038111A1
公开(公告)日：2022-02-03
申请号：US17380176
申请日：2021-07-20
Inventor： Ross C. MORGAN , Tahir RASHID , Jonathan TAYLOR
Abstract: The present disclosure relates to circuitry comprising: digital circuitry configured to generate a digital output signal; and monitoring circuitry configured to monitor a supply voltage to the digital circuitry and to output a control signal for controlling operation of the digital circuitry, wherein the control signal is based on the supply voltage.
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公开(公告)号：US20220038087A1
公开(公告)日：2022-02-03
申请号：US17226843
申请日：2021-04-09
Inventor： Tahir RASHID , Jonathan TAYLOR , Ross C. MORGAN , Holger HAIPLIK
IPC: H03K7/08
Abstract: The present disclosure relates to circuitry comprising: pulse-width modulation (PWM) circuitry configured to generate a PWM output signal; and monitoring circuitry configured to monitor a supply voltage to the PWM circuitry and to output a control signal for controlling operation of the PWM circuitry, wherein the control signal is based on the supply voltage.
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公开(公告)号：US20250047275A1
公开(公告)日：2025-02-06
申请号：US18364027
申请日：2023-08-02
Inventor： Malcolm BLYTH , Ross C. MORGAN , Michael ROBINSON
IPC: H03K17/082 , H04R3/00 , H04R29/00
Abstract: This application relates to methods and apparatus for current monitoring in switched mode drivers. A switching driver has an output stage with a network of switches for switching an output node between different switching voltages and a modulator for controlling a duty-cycle of the switching output stage based on the input signal, where the modulator generates a modulator signal based on the input signal. A current monitor is configured to receive a first current signal indicative of a sensed first driver current and to determine and/or limit a second driver current using the first current signal and the modulator signal. One of the first driver current and the second driver current is an output current to the load and the other of the first driver current and the second driver current is an input current from a power supply.
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公开(公告)号：US20240413822A1
公开(公告)日：2024-12-12
申请号：US18810168
申请日：2024-08-20
Inventor： Ross C. MORGAN , Joe WALKER , Yongjie CHENG , Lingli ZHANG
IPC: H03K17/693 , H03K3/017 , H03K17/687
Abstract: This application relates to methods and apparatus for multichannel drivers for driving transducers in different channels. A multichannel driver has a plurality of output stages configured such that two output nodes can be modulated between selected switching voltages with a controlled duty cycle to generate a differential output signal across a respective transducer, each output stage being operable with different switching voltages in different modes of operation. A first set of two or more of the output stages are arranged to receive a voltage output by a capacitive voltage generator to use as a switching voltage. A controller is configured to control the mode of operation and duty-cycle of each of the output stages based on a respective input signal and also based on operation of the other output stages of the first set.
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