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基于UC3842的开关电源输入度过压维养护电路.pdf全

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  26 5 2007 10

  Vol.26 No.5 Journal of Liaoning Technical University Oct. 2007

  1008-0562(2007)05-0727-04

  UC3842

  1 2 1

  1. 266033 2. 710054

  UC3842 UC3842

  TL431

  UC3842

  TM 461.4 A

  Input over-voltage protection circuit of switching

  power supply based on UC3842

  1 2 1

  PAN Ai-xian WEI Li , ZHAO Yan-qu

  (1. College of Automation, Qingdao Technological University, Qingdao 266033,China; 2. College of

  ’ ’

  Electrical &Control Engineering, Xi An University of Science and Technology, Xi An 710054, China)

  Abstract In order to achieve input over-voltage protection function of the UC3842 a switching power supply,

  which allows a power supply to avoid potential safety problems, the inherent UC3842 chip voltage reference

  voltage source and the TL431 are used in the design of electrical specifications which meet the requirements of

  normal use conditions. A relatively low pressure switch is chosen and is designed a simple structure of circuit

  with low-cost, innovative and practical input over-voltage protection circuit. Case analysis and experimental

  results show the feasibility of the protection circuit.

  Key words: UC3842 switching power supply input over-voltage protection circuit

  [4]

  UC3842

  DC/DC AC/DC

  UC3842

  PWM [1-2]UC3842

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