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.