Patent ID: 7683356

Claim:
A voltage converting circuit comprising: a control chip for outputting a first voltage signal; a first photoelectric coupler to convert the first voltage signal into a second voltage signal, wherein the first photoelectric coupler comprises: a first light-emitting element comprising a first terminal connected to the control chip to receive the first voltage signal, and a grounded second terminal; and a first photosensor comprising a first terminal connected to a first power supply, and a second terminal outputting the second voltage signal to supply voltage to an electronic component; a second photoelectric coupler to convert a third voltage signal sent out by the electronic component into a fourth voltage signal for supplying voltage for a detecting chip, wherein the second photoelectric coupler comprises: a second light-emitting element comprising a first terminal receiving the third voltage signal from the electronic component, and a grounded second terminal; and a second photosensor comprising a first terminal connected to a second power supply, and a second terminal connected to the detecting chip to output the fourth voltage signal to the detecting chip; and a connector connected to the electronic component, wherein the connector comprises a power pin connected to the second terminal of the first photosensor to receive the second voltage signal, a sensing pin connected to the first terminal of the second light-emitting element to output the third voltage signal, and a grounded pin; wherein the first photosensor is arranged such that a light emitted from the first light-emitting element turns on the first photosensor in response to the first voltage signal being at a high level, and wherein the first power supply adjusts the voltage level of the second voltage signal sent out by the first photosensor to satisfy a voltage demand of the electronic component; and wherein the second photosensor is arranged such that a light emitted from the second light-emitting element turns on the second photosensor in response to the third voltage signal being at a high level, and wherein the second power supply adjusts the voltage level of the fourth voltage signal sent out by the second photosensor to satisfy a voltage demand of the detecting chip.