Abstract: A power supply arrangement for a single ended class D amplifier, including a first primary winding connected in series with a first switch between the positive supply rail and ground, a second primary winding in phase with said first primary winding and connected in series with a second switch between the negative supply rail and ground, and a controller adapted to apply a control signal to said first and second switches, said control signal (Q) having ON-pulses of a predefined pulse time separated by a dead time. In use, the primary winding connected to the supply rail with the highest numerical voltage will transform the rail voltage difference to the supply rail with the lowest numerical voltage through the opposite primary winding thus reducing any voltage unbalance between the windings.

Abstract: A power converter with positive and negative supply rail outputs for feeding a single ended class D amplifier, the converter comprising a transformer arrangement, a supply pump reduction arrangement connected between the secondary windings and the positive and negative supply rail outputs, and a boost drive mode switching arrangement. A controller is adapted to control the power converter in a negate drive mode and a boost drive mode, wherein the output voltage in the boost mode is increased by means of the transformer and the boost drive mode switching arrangement. The output voltages on the positive and negative rails can be generated at two different output voltage levels without changing the duty cycle or dead time of the control signals.

Abstract: A power converter with positive and negative supply rail outputs for feeding a single ended class D amplifier, the converter comprising a transformer arrangement, a supply pump reduction arrangement connected between the secondary windings and the positive and negative supply rail outputs, and a boost drive mode switching arrangement. A controller is adapted to control the power converter in a negate drive mode and a boost drive mode, wherein the output voltage in the boost mode is increased by means of the transformer and the boost drive mode switching arrangement. The output voltages on the positive and negative rails can be generated at two different output voltage levels without changing the duty cycle or dead time of the control signals.

Abstract: A power supply arrangement for a single ended class D amplifier, including a first primary winding connected in series with a first switch between the positive supply rail and ground, a second primary winding in phase with said first primary winding and connected in series with a second switch between the negative supply rail and ground, and a controller adapted to apply a control signal to said first and second switches, said control signal (Q) having ON-pulses of a predefined pulse time separated by a dead time. In use, the primary winding connected to the supply rail with the highest numerical voltage will transform the rail voltage difference to the supply rail with the lowest numerical voltage through the opposite primary winding thus reducing any voltage unbalance between the windings.