Patent ID: 6545889
Filing Date: 2003-04-08
Classification: H02M

Abstract:
A transformerless AC/DC converting control circuit, which is used for a transformerless AC/DC converting apparatus and has a current input contact and a current output contact; and a current flowing through the control circuit is defined as a load current; said control circuit primarily comprising a current-switch circuit, a duty-control circuit and a load-current limiting circuit, wherein:said current-switch circuit having a current input contact, a current output contact and a control contact, and being used to switch on/off and control the load current in accordance with received output signals from said duty-control circuit and said load-current limiting circuit; said duty-control circuit having a current input contact, a current output contact and a control contact, and being used to switch on or off said load current when a potential between said input and output contacts of said control circuit is lower or higher than predetermined values; and said load-current limiting circuit having a current input contact, a current output contact and a control contact, and being used to limit said load current by means of said current-switch circuit when said load current is higher than a predetermined value.