×

Multi-phase and multi-module power supplies with balanced current between phases and modules

  • US 6,215,290 B1
  • Filed: 11/15/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 11/15/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A multi-phase power supply which balances current between phases, comprising:

  • at least one input power source for supplying current for each of said phases;

    a filter capacitor at the output of each of said phases;

    a sensor inductor winding at the output of each of said phases, said sensor inductor winding having an input and an output;

    a filter inductor winding at the output of each of said phases, said filter inductor winding having an input and an output, wherein said sensor inductor winding and said filter inductor winding have the same number of turns and said input of said sensor inductor winding and said input of said filter inductor winding are connected together at the output of each of said phases;

    a magnetic core at each of said phases, about which a corresponding sensor inductor winding and a corresponding filter inductor winding are wound;

    a differential amplifier at each of said phases for sensing and amplifying a voltage difference between the outputs of said corresponding sensor inductor winding and said corresponding filter inductor winding;

    circuitry to sum and average outputs from all differential amplifiers, forming a current-sharing bus between each of said phases, a feedback correction circuit at each of said phases which utilizes the voltage on said current-sharing bus as a reference; and

    a pulse width modulator at each of said phases controlled by a corresponding feedback correction circuit for adjusting the duty cycle of a corresponding phase.

View all claims
  • 6 Assignments
Timeline View
Assignment View
    ×
    ×