US 12,706,534 B2Granted

Method for calibrating a switching converter

AssigneeSTMicroelectronics International N.V.

InventorDavid Chesneau

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Abstract

A buck switching converter is calibrated using a method which alternates between first and second calibration phases. During each first calibration phase: a time period of low-side switch on state is kept constant and, for each current pulse in an inductor, a sign of a value of the current at the end of the time period of on state of the low-side switch is determined. Modification of a time period of high-side switch on state is made based on the determined sign. During each second calibration phase: a time period of high-side switch on state is kept constant and, for each current pulse in the inductor, a value of the current at the end of the time period of on state of the high-side switch is compared with a target value. Modification of the time period of low-side switch on state is made based on the comparison.

Claims11

Dependent claims

A method of calibration of a buck switching converter operating in pulse frequency modulation, the method comprising:

alternating between first and second calibration phases;
wherein each first calibration phase comprises:
keeping constant a time period of on state of a low-side switch during the first calibration phase;
and
for each current pulse in an inductor of the buck switching converter during the first calibration phase, determining a sign of a value of the current pulse at an end of the time period of on state of the low-side switch;
modifying a time period of on state of a high-side switch of a next current pulse during the first calibration phase based on the determined sign;
and
wherein each second calibration phase comprises:
keeping constant the time period of an on state of the high-side switch during the second calibration phase;
and
for each current pulse in the inductor of the buck switching converter during said second calibration phase, comparing a value of the current pulse at the end of the time period of on state of the high-side switch with a target value;
and
modifying a time period of on state of the low-side switch of the next current pulse during the second calibration phase based on said comparison.

10 more elements

A method of calibration of a buck switching converter operating in pulse frequency modulation with a high-side switch and low-side switch, the method comprising:

performing a first calibration phase over a first plurality of current pulses in an inductor of the buck switching converter by:
holding an on state time period of the low-side switch constant for each current pulse of the first plurality of current pulses;
determining a sign of a value of the current pulse at the end of each on state time period of the low-side switch;
and
adjusting an on state time period of the high-side switch based on the sign of the value;
performing a second calibration phase after the first calibration phase over a second plurality of current pulses in the inductor of the buck switching converter where:
holding the on state time period of the high-side switch constant for each current pulse of the second plurality of current pulses at a value set in response to performing the first calibration phase;
comparing a value of the current pulse at the end of each on state time period of the high-side switch with a target value;
and
adjusting an on state time period of the low-side switch based on the comparison.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/597,428Filed 6 Mar 2024
Priority: FR 230225510 Mar 2023
Published: US 2024/0305197 A112 Sep 2024
Granted: 11 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H02M 3/158
With automatic control of output voltage or current, e.g. switching regulators: including plural semiconductor devices as final control devices…
H02M 1/14
Details of apparatus for conversion: arrangements for reducing ripples from DC input or output
H02M 3/1555
Using semiconductor devices only: for the generation of a regulated current to a load whose impedance is substantially inductive
H02M 3/157
With automatic control of output voltage or current, e.g. switching regulators: with digital control