Electronic ballast having a protective circuit for a switching transistor of a converter

Electronic ballast having a protective circuit for a switching transistor of a converter

  • CN 1,610,475 A
  • Filed: 10/22/2004
  • Published: 04/27/2005
  • Est. Priority Date: 10/22/2003
  • Status: Active Application
First Claim
Patent Images

1. , electric ballast hasThe converter by power feed of a belt switch transistor (S20) (L20, L21, C10, C30, S20, D20) andA circuit (C1, C2, R1, R2, D1-3, T1) that detects the time-derivative of supply voltage, this designed circuit are used for protecting the switching transistor (S20) of converter (L20, L21, C20, C30, S20, D20) to prevent overload by switching process under the situation that measured time-derivative is responded.

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