POWER SUPPLY METHOD AND APPARATUS

摘要

A method and apparatus for providing a power supply for an amplifier is provided. The power conversion is achieved using synchronous rectifiers in a regulated half bridge power supply, taking the sum of the positive and negative rails as feedback, in order facilitate energy transfer between positive and negative output rails. This minimizes the effects of off side charging and rail sag, as well as achieving good line regulation, while allowing use of very small, low value output capacitors.

主权项

1. Apparatus comprising:
a power supply circuit comprising bidirectionally conductive synchronous rectifiers, a power supply control circuit coupled to the power supply circuit, the power supply control circuit configured to provide a control signal to control the power supply circuit based on a difference between positive and negative supply voltages provided by the power supply circuit, and a load circuit coupled to the power supply circuit; wherein the control signal is configured to control a transfer of charge through the synchronous rectifiers to compensate for off side charging of capacitors on the positive and negative supply voltages resulting from operation of the load circuit.