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Apparatus for the control of a switched power regulator

  • US 4,529,927 A
  • Filed: 10/07/1983
  • Issued: 07/16/1985
  • Est. Priority Date: 10/07/1983
  • Status: Expired due to Fees
First Claim
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1. In an apparatus for the control of a switched power regulator including an inductor through which an electric current flows, and a regulating switch arranged for being switched between a first non-conducting logic state and a second conducting logic state in response to a drive signal with a predetermined time elapsing between said first and second logic states, an electric controller operating in a conductance control mode, comprising:

  • reference signal generator means (1,10) responsive to a command signal (Vc) for generating a reference signal (V1) the amplitude of which is a function of the command signal, said reference signal having an upper threshold level and a lower threshold level;

    current sensor means (2) connected to sense said electric current (I) and to generate a sensor signal (V2) representing said current;

    comparator means (20) connected to compare the sensor signal to the reference signal for producing said drive signal for the regulating switch (Qo), said drive signal (VD) having a first state when the increasing sensor signal is lower than the upper threshold level of the reference signal and a second state when the decreasing sensor signal is greater than the lower threshold level of the reference signal;

    means (30) for switching the reference signal from one level to the other in response to the drive signal swinging from one state to the other;

    controllable switching means (40) responsive to a control signal (Vx) to vary the threshold levels of the reference signal, thereby to vary the time elapsing between said first and second logic states of the regulating switch;

    phase-locked loop circuit means (7) comprising phase comparator and low-pass filter means connected to accept a signal (fLC3) representing the switching frequency of the apparatus and an external frequency signal (fS) and to produce a control signal (Vx) for said controllable switching means (40), said control signal being a function of the phase difference between the input signals thereto.

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