The input of a type of domestic flyback switching power supply has suffered several accidental short-circuit failure when this power supply is operating in the analog quantity conditioning module of the domestic safety level DCS platform.The internal principle of the power supply is analyzed,and a fault simulation model is established.This fault was located by combining the practical application scenarios of safety level DCS.The failure mechanism of this type of domestic flyback switching power supply was defined,and improved and optimized solutions was designed,thus the reliability and safety of the domestic safety level DCS platform are improved effectively.
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