LED switching power supply selection and considerations
First, the metal shell power cord and shell generally connected to the ground (FG), to be reliably grounded to ensure safety, not mistakenly connected to the shell on the zero line.
Second, in the installation is completed before the power test run, please check and proofread the wires on the terminals, sure that the input and output, AC and DC, single-phase and multi-phase, positive and negative poles, voltage and current values, etc. correctly and undoubtedly.
Only then can the power run.
Third, for high-power LED switching power supply, generally have three or more than three "+" input terminals and "-" output terminals, in fact, they are the same as an output electrode, just in order to make the user wiring convenience, and will be more than one terminal respectively in the internal parallel connection. together.
Fourth, in order to achieve the full effect of heat dissipation, generally to be installed in the air convection conditions in a good position or installed in the chassis shell through the shell will heat out.
Fifth, led switching power supply factory before adding resistive load, such as the need to be used in capacitive or inductive load, should be specified in advance when ordering
Sixth, for the dual output symmetrical load, give priority to the symmetrical output power supply.
Seven, the power supply FG is not grounded users, hand touch the shell or the output of a numb electric feeling is a normal phenomenon, floating ground FG on the earth about 110V AC output, which is the internal structure of the power supply decision.
Eight, the definition of AC input power input power = output power / (input voltage * power factor * efficiency)
Nine, sink leakage current: multiple power supplies in use, the common intake of the same grounding point, the total leakage current is composed of the leakage current of each unit added together, then check the reliability of the protective grounding wire and grounding resistance to meet the requirements in order to protect against electric shock.
