US 6,661,216 B1Granted

Apparatus and method for controlling startup of a precharged switching regulator

AssigneeTexas Instruments Incorporated

InventorsDavid A. Grant, David D. Briggs, Ayesha I. Mayhugh

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Abstract

An apparatus for presenting a regulated output at an output locus established at a precharge level includes: (a) an error indicator generating an error signal indicating difference between a reference signal and a sensed signal; (b) a pulse indicator coupled with the error indicator generating a pulse signal indicating difference between the error signal and a periodic signal; (c) a switching device responding to the pulse signal effecting coupling of the output locus with a first terminal or a second terminal depending upon whether the pulse signal is at a first level or a second level; and (d) a driver controller coupled with the pulse indicator and the switching device that provides a control signal to the switching device indicating at least one characteristic of the pulse signal. The switching device is operative or inoperative depending upon whether the control signal is in a first state or a second state.

Claims12

Dependent claims

An apparatus for generating an output signal at an output locus substantially at a regulated voltage;

said output locus being established at a precharge voltage less than said regulated voltage prior to startup of the apparatus;
the apparatus comprising:
(a) a difference-indicating unit;
said difference-indicating unit being coupled with said output locus and generating a pulse signal at a pulse signal locus;
said pulse signal representing difference between an extant signal at said output locus and said regulated voltage;
(c) a switching unit coupled with said pulse signal locus;
said switching unit responding to said pulse signal to effect switched coupling of said output locus with a first terminal when said pulse signal is at a first signal level and to effect switched coupling of said output locus with a second terminal when said pulse signal is at a second signal level;
and
(d) a driver control unit coupled with said pulse signal locus and with said switching unit;
said driver control unit applying a control signal to said switching unit;
said control signal preventing said switching unit effecting said switched coupling when said control signal is at a first value;
said control signal permitting said switching unit effecting said switched coupling when said control signal is at a second value;
said driver control unit monitoring said pulse signal to detect presence of a pulse signal at said pulse signal locus;
said driver control unit responding to detecting said pulse signal satisfying at least one predetermined condition to change said control signal from one value of said first value and said second value to the other value of said first value and said second value.

11 more elements

An apparatus for presenting a substantially regulated output signal at an output locus;

said output locus being established at a precharge level substantially equal with or less than said regulated output signal;
the apparatus comprising:
(a) an error indicator device;
said error indicator device generating an error signal indicating a first difference between a reference signal and a sensed signal;
(b) a pulse indicator device coupled with said error indicator device and generating a pulse signal indicating a second difference between said error signal and a periodic reference signal;
(c) a switching device coupled with said pulse indicator device and responding to said pulse signal to effect switched coupling of said output locus with a first terminal when said pulse signal is at a first signal level, and to effect switched coupling of said output locus with a second terminal when said pulse signal is at a second signal level;
and
(d) a driver control device coupled with said pulse indicator device and said switching device;
said driver control device providing a control signal to said switching device indicating at least one characteristic of said pulse signal;
said switching device responding to said control signal;
said switching device being inoperative when said control signal is in a first state and being operative when said control signal is in a second state.

8 more elements

A method for controlling startup of a precharged switching regulator apparatus;

the method comprising the steps of:
(a) in no particular order:
(1) providing a switched regulator apparatus configured for presenting a substantially regulated output signal at an output locus;
said output locus established at a precharge level less than said regulated output signal;
said switched regulator apparatus including:
[a] an error indicator device;
said error indicator device generating an error signal indicating a first difference between a reference signal and a sensed signal;
[b] a pulse indicator device coupled with said error indicator device and generating a pulse signal indicating a second difference between said error signal and a periodic reference signal;
and
[c] a switching device coupled with said pulse indicator device and responding to said pulse signal to effect switched coupling of said output locus with a first terminal when said pulse signal is at a first signal level, and to effect switched coupling of said output locus with a second terminal when said pulse signal is at a second signal level;
(2) providing a driver control device coupled with said pulse indicator device and said switching device;
said driver control device providing a control signal to said switching device indicating at least one characteristic of said pulse signal;
said switching device responding to said control signal;
said switching device being in an inoperative condition when said control signal is in a first state and being in an operative condition when said control signal is in a second state;
and
(3) establishing said control signal in said first state to place said switching device in said inoperative state;
(b) commencing a startup sequence for the apparatus;
(c) sampling said pulse signal;
(d) determining whether a pulse signal is extant;
(e) if no pulse signal is extant, repeating steps (c) through (d);
(f) if a pulse signal is extant, determining whether at least one predetermined criteria has been met;
(g) if said at least one predetermined criteria has not been met, repeating steps (c) through (f);
(h) if said at least one predetermined criteria has been met, establishing said control signal in said second state to place said switching device in said operative state;
and
(i) terminating said startup sequence.

22 more elements

Dependencies are inferred from the claim text.