sijeophilip
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Hi,
We have designed a AC to DC SMPS with input supporting Universal Input (i.e. 90V to 285 V) and output of 24V/2A (Please find enclosed schematics for consideration) with external circuit for primary side OV and UV protection, Some of the boards are not working (i.e. the power supply is resetting again and again)and while we tried troubleshooting we probed the VCC (which you can see is from the bias winding of the transformer) of the IC w.r.t to primary ground using a Voltage probe of our oscilloscope.... But for some reason when we probe it either the Common Mode Choke(just to understand if the OV or UV is acting unexpectedly) or the Fuse on the primary side blows off... Can someone help us understand why the overcurrent scenario is encountered by connecting the probe of the oscillcope to the bias winding ...
Also would appreciate if anyone can advise how it should be done correctly.
We have designed a AC to DC SMPS with input supporting Universal Input (i.e. 90V to 285 V) and output of 24V/2A (Please find enclosed schematics for consideration) with external circuit for primary side OV and UV protection, Some of the boards are not working (i.e. the power supply is resetting again and again)and while we tried troubleshooting we probed the VCC (which you can see is from the bias winding of the transformer) of the IC w.r.t to primary ground using a Voltage probe of our oscilloscope.... But for some reason when we probe it either the Common Mode Choke(just to understand if the OV or UV is acting unexpectedly) or the Fuse on the primary side blows off... Can someone help us understand why the overcurrent scenario is encountered by connecting the probe of the oscillcope to the bias winding ...
Also would appreciate if anyone can advise how it should be done correctly.