Patent ID: 9013159
Filing Date: 2015-04-21
Classification: H02M

Abstract:
1. A parallel-operating power supply system comprising a switching power supply apparatus and at least one other switching power supply apparatus, each of said switching power supply apparatuses having a switching device switching-controlled by a switching signal produced based on a clock signal and developing an output between two output terminals thereof, said output terminals of said switching power supply apparatuses being connected in parallel; wherein, said switching power supply apparatus is a master switching power supply apparatus and said at least one other switching power supply apparatus is a slave switching power supply apparatus; a clock signal generated in said master switching power supply apparatus is applied to said at least one slave switching power supply apparatus as said clock signal therefor, said clock signal of said master power supply apparatus being applied to said at least one slave switching power apparatus through a first isolation transmission circuit of said master switching power supply apparatus and through a second isolation transmission circuit of said at least one slave switching power supply apparatus, said first and second isolation transmission circuits having a same delay characteristic; and said clock signal of said master switching power supply apparatus outputted through said first isolation transmission circuit is applied back to said master switching power supply apparatus through a third isolation transmission circuit of said master switching power supply apparatus, said third isolation transmission circuit having a delay characteristic same as the delay characteristic of said first and second isolation transmission circuits, for thereby producing said switching signal; wherein, each of said first through third isolation transmission circuits is a photocoupler.