Patent ID: 9077257
Filing Date: 2015-07-07
Classification: H02M,H03F

Abstract:
1. A power supply arrangement comprising power supply unit with a positive supply rail and a negative supply rail for supplying a single ended class D amplifier, and a transformer arrangement connected between the positive and negative power rails, said transformer arrangement 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, so that, when said first and second switches are closed (ON), said first winding will experience a first potential difference and said second winding will experience a second potential difference, wherein, if said first potential difference is greater than said second potential difference, said second switch will act as a rectifier, and energy will be transformed from said first winding to said second winding, and wherein, if said second potential difference is greater than said first potential difference, said first switch will act as a rectifier, and energy will be transformed from said second winding to said first winding, so that energy will be transferred continuously cycle by cycle, thereby reducing supply pumping.