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Switching converter with several converter stages

  • US 20070236287A1
  • Filed: 03/23/2007
  • Published: 10/11/2007
  • Est. Priority Date: 03/23/2006
  • Status: Active Grant
First Claim
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1. Switching converter for generating an output voltage (Vout) from an input voltage (vin), comprising:

  • a control arrangement (30) for furnishing a control signal (Serr) dependent on the output voltage (Vout), a first converter stage (1A) and at least one second converter stage (1B, 1C), each of which has;

    an inductive storage element (11A, 11B, 11C), a current measurement arrangement (12A, 12B, 12C) which is designed to detect a current (IL1, IL2, IL3 ) across the inductive storage element (11A, 11B, 11C) and to furnish a current measuring signal (Is1, Is2, Is3) proportional to this current, a pulse width modulator (16A, 16B, 16C) which receives the control signal (Serr) and the current measuring signal (Is1, Is2, Is3) and which furnishes a pulse width modulated signal (PWM1, PWM2, PWM3), and a driver circuit which receives the pulse width modulated signal, (PWM1, PWM2, PWM3) and the input voltage (Vin) and which applies the input voltage (Vin) in dependence on the pulse width modulated signal (PWM1, PWM2, PWM3) to the inductive storage element (11A, 11B, 11C), wherein a proportionality factor between the current (IL2, IL3) across the inductive storage element (11B, 11C) and the current measuring signal (Is2, Is3) of the current measurement arrangement (12B, 12C) of the at least one second converter stage (1B, 1C) can be adjusted and wherein the current measurement arrangement (12B, 12C) of the at least one second converter stage receives an adjustment signal (k2, k3), which is dependent on a proportionality factor between a current across the inductive storage element (11A) of the first switching converter (1A) and the current measuring signal (Is1) of the first switching converter (1A).

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