Abstract: Systems and methods for managing illness outside of a hospital environment are provided. A plurality of alert generation definitions is stored with each of the definitions defining at least one condition for generating an alert. A patient profile data structure for a patient is generated which includes indicators of characteristics of the patient. Monitoring data is received, which reflects at least one of (i) physiological indicators of the patient; and (ii) indicators of medical supplies being ordered or consumed by the patient. An alert relating to patient healthcare is generated by applying at least one of the alert generation definitions to the received monitoring data. Population data reflective of healthcare outcomes for a patient population is received. At least one further alert generation definition is generated upon processing the population data, and the at least one further alert generation definition is stored.

Abstract: Embodiments of the invention relate generally to semiconductors for power generation and conversion applications, and more particularly, to devices, integrated circuits, substrates, and methods to convert direct current (“DC”) voltage signals to alternating current (“AC”) voltage signals. In some embodiments, a method for converting DC voltage signals to AC voltage signals can include generating a first portion of an output voltage signal using a polarity circuit, generating a second portion of the output voltage signal using another polarity circuit, wherein the output voltage signal comprises an AC signal, and synchronizing the first portion and the second portion of the output voltage signal to a frequency using an AC reference signal.

Abstract: Embodiments of the invention relate generally to semiconductors for power generation and conversion applications, and more particularly, to devices, integrated circuits, substrates, and methods to convert direct current (“DC”) voltage signals to alternating current (“AC”) voltage signals. In some embodiments, an inverter can include a modulator configured to convert a direct current signal into a first variable signal, and a transformation module configured to step up the first variable signal to form a second variable signal. The transformation module can be configured to generate a first portion of the second variable signal and a second portion of the second variable signal. Further, the inverter can include a waveform generator configured to synchronize the first portion and the second portion of the second variable signal at a frequency to generate an alternating current (“AC”) signal.

Abstract: Embodiments of the invention relate generally to semiconductors for power generation and conversion applications, and more particularly, to devices, integrated circuits, substrates, and methods to convert direct current (“DC”) voltage signals to alternating current (“AC”) voltage signals. In some embodiments, an inverter can include a modulator configured to convert a direct current signal into a first variable signal, and a transformation module configured to step up the first variable signal to form a second variable signal. The transformation module can be configured to generate a first portion of the second variable signal and a second portion of the second variable signal. Further, the inverter can include a waveform generator configured to synchronize the first portion and the second portion of the second variable signal at a frequency to generate an alternating current (“AC”) signal.

Abstract: A self-oscillating switching amplifier having an error amplifier output combined with the output of an output signal differentiator according predetermined weighing factors to force a small oscillation around the averaged output signal at a high frequency. The feedback voltage is sensed at the output of the switching amplifier. Additional feedback can be derived from a switching node of the power switch. The switching of the power switch can be dynamically changed from binary switching when the amplitude of the audio signal is low, to ternary switching when the amplitude of the input signal is high to minimize distortion of the output signal. The amplifier can be supplied with a pulsing voltage. In certain embodiments the output signal differentiator is simply a capacitor or a LC resonance circuit coupled directly to an appropriate speaker terminal for the highest possible self-oscillating frequency of the switching amplifier.

Abstract: A self-oscillating switch-mode amplifier amplifying an input signal into a power output signal comprising an integrator for integrating the difference between the input signal and the output signal and a hysteretic comparator with thresholds which are modulated according to absolute value of the input signal. When the thresholds are quadratic function of the absolute value of the input signal, the switching frequency of the self-oscillating amplifier can be substantially constant.

Abstract: An amplifier is provided. The amplifier comprises an H-bridge with two halves. A capacitor and two inductors are coupled to the H-bridge. Each inductor, a half of the H-bridge, and the capacitor are configured as a boost converter.

Abstract: A self-oscillating switching amplifier having an error amplifier output combined with the output of an output signal differentiator according predetermined weighing factors to force a small oscillation around the averaged output signal at a high frequency. The feedback voltage is sensed at the output of the switching amplifier. Additional feedback can be derived from a switching node of the power switch. The switching of the power switch can be dynamically changed from binary switching when the amplitude of the audio signal is low, to ternary switching when the amplitude of the input signal is high to minimize distortion of the output signal. The amplifier can be supplied with a pulsing voltage. In certain embodiments the output signal differentiator is simply a capacitor or a LC resonance circuit coupled directly to an appropriate speaker terminal for the highest possible self-oscillating frequency of the switching amplifier.

Abstract: A single-cycle response pulse width modulator comprising a single error integrating amplifier. The error integrator output is compared to zero to set a flip-flop. A linear ramp voltage is compared to the reference voltage to reset the flip-flop. The linear ramp voltage is generated by a voltage-controlled current source coupled to the supply voltage and charging a capacitor. The flip-flop when reset discharges the capacitor. Corrective circuits compensate for delay times in components to maintain substantially constant switching frequency and low distortion in the output voltage. The controller is capable of outputting a predictive triggering signal for associated class-N amplifiers.

Abstract: A family of switching amplifiers with reduced component count and lower current stresses on switches. The amplifiers have a power modulator comprising ground-referenced switches driving a tapped transformer which reduces current stresses on switches. A synchronous demodulator transforms modulated voltages back to audio signal. In one embodiment, the synchronous demodulator comprises switches in a H-bridge configuration selectively connecting the transformer to ground reference through a loudspeaker, driving it with bipolar voltages. Different embodiments using MOSFETs to implement the functions of a synchronous demodulator using bi-directional switches reduce total component count and increase the efficiency of the amplifiers. Timing control of the power modulator and the synchronous demodulator enables zero current switching of the power modulator.

Abstract: A family of switch-mode power supplies with low current stresses on switches and capable of producing an output voltage higher than the input voltage, incorporating a multiple-tap transformer driven by at least one ground-referenced switch. When the transformer is center-tapped, it is driven by two ground-referenced switches. The current stress in each switch is equal to the difference between the source current and the load current. The converters can operate in zero current switching and zero voltage switching. Integrated magnetics can be used to reduce further component count.

Abstract: A single-cycle response pulse width modulator comprising a single error integrating amplifier. The error integrator output is compared to zero to set a flip-flop. A ramp voltage is compared to the reference voltage to reset the flip-flop. The ramp voltage is generated by a resistor connected to the supply voltage and charging a capacitor. The flip-flop when reset discharges the capacitor. Corrective circuits compensate for delay times in components to maintain substantially constant switching frequency and low distortion in the output voltage. A predictive triggering circuit puts out a signal for predetermined sequencing of events.