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Methods and circuits for programmable current limit protection

  • US 7,019,507 B1
  • Filed: 11/26/2003
  • Issued: 03/28/2006
  • Est. Priority Date: 11/26/2003
  • Status: Active Grant
First Claim
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1. A current limit circuit for protecting a power converter, the current limit circuit coupled to (1) an inductor through which inductor current flows, the inductor current having instantaneous and average inductor current values;

  • (2) a switch having at least one switch element and a duty cycle; and

    (3) a filtering component having an adjustable filtered signal, the current limit circuit comprising;

    a steady-state current limit circuit that reduces average inductor current value to a steady-state threshold during a transient phase and regulates average inductor current value approximately at the steady-state threshold responsive to an over-current condition; and

    a cycle-by-cycle current limit circuit that commands reduction of instantaneous inductor current value after the instantaneous inductor current value equals or exceeds a maximum instantaneous threshold during the transient phase.

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