NON-ISOLATED AC-DC CONVERSION POWER SUPPLY

摘要

A non-isolated capacitive AC-DC conversion power supply includes a current limiting input module that receives AC input power and has an output capacitor that supplies DC power. Charge storage stages have charge storage capacitors, a rectifier supplying rectified current from the input module to charge the charge storage capacitors and the output capacitor during a first part-cycle of the AC input power. The charge storage stages also include current amplifiers and unidirectional elements that conduct discharge current from the charge storage capacitors to charge the output capacitor during a second part-cycle of the AC input power. Ground of the DC output can be connected to the live AC input.

主权项

1. A non-isolated capacitive alternating current-direct current (AC-DC) conversion power supply, comprising:
an input section for receiving AC input power and including a current limiting input module; an output section for supplying DC power and including an output capacitor; and at least a first charge storage stage having a charge storage capacitor, a rectifier module connected to supply rectified current from the input module to charge the charge storage capacitor and the output capacitor during a first part-cycle of the AC input power, and a current amplifier and a unidirectional element connected to supply discharge current from the charge storage capacitor to charge the output capacitor during a second part-cycle of the AC input power, wherein the current amplifier comprises a transistor, and the rectifier module is connected between base and emitter terminals of the transistor and controlled by a reverse bias on the transistor.