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.

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.

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.

Abstract: A system includes a wireless transmission module configured to transmit electrical energy to a wireless receiver module via reverse wireless charging, one or more electronic components other than the wireless transmission module, a battery configured to provide electrical energy to the wireless transmission module and the one or more electronic components, and a battery management module coupled to the battery and the wireless transmission module. The battery management module is configured to determine an amount of power demanded by the wireless transmission module and the one or more electronic components from the battery and dynamically vary power transfer from the wireless transmission module to the wireless receiver module as a function of the amount of power demanded by the one or more electronic components.

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.

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.

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.

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.

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 in 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.

Abstract: This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a load with an output signal has a switching driver with a switch network and a modulator configured to control the switch network to switch output nodes between different switching voltages with a controlled duty-cycle. A quantizer controller receives a quantizer input signal based on an input signal and a feedback signal and controls the duty-cycle of the switch network. 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, wherein 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 said quantizer input signal.

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.

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.

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.

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.

Abstract: An integrated circuit (IC) comprising: control circuitry operable to control: an external switch of a primary current path for an energy storage component of a circuit, wherein the external switch of the primary current path is external to the IC; a first internal switch of a secondary current path for the energy storage element, wherein the first internal switch is internal to the IC, wherein the IC is operable in: a first mode in which the first internal switch of the secondary current path is actuated to enable the secondary current path; and a second mode in which the external switch of the primary current path is actuated to enable the primary current path.

Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A switching driver has first and second supply node for receiving supply voltages and includes an output bridge stage, a capacitor and a network of switches. The network of switches is operable in different switch states to provide different switching voltages to the output bridge stage. A controller is configured to control the switch state of the network of switches and a duty cycle of output switches of the output bridge stage based on an input signal to generate an output signal for driving the transducer.

Abstract: A power delivery system may include an inductive power converter comprising a shared connection to a shared voltage from a battery, multiple inductive phases, each of the multiple inductive phases configured to generate a respective voltage from the shared voltage, multiple regulated voltage connections, and one or more switches configured and arranged to selectively assign at least one of the multiple inductive phases to a regulated voltage connection selected from the multiple regulated voltage connections.

Abstract: An integrated circuit (IC), comprising: a first transducer driver for driving a first transducer; a second transducer driver for driving a second transducer; and boost circuitry comprising first and second boost nodes, the boost converter configurable to boost a supply voltage received at one or more input pins of the IC to provide first and second boosted voltages to respective first and second transducer drivers via respective first and second boost nodes.

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.

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.