US 2020/0091819 A1 · Current Balance Feedback Circuit and Method to Improve the Stability of a Multi-Phase Converter

Abstract

A solution is provided for a current balance feedback method to improve stability in a multi-phase DC-DC switching converter, where the current balance feedback signal is added to the PWM duty signal, after the PWM comparator. Using this feedback method, current balance oscillation issues caused by the non-linearity of the main control loop can be solved, and provide better current balance stability in the switching converter. Advantages include improving the stability of the current balance feedback loop by introducing the correction post PW modulation in the time domain, effectively bypassing interaction with the PW modulator. The current balance feedback loop stability improvement reduces PCB design effort and iteration.

Claims22

Dependent claims

A current balance feedback circuit, in a multi-phase DC-DC switching converter, comprising:

a pulse width modulator, configured to provide a primary pulse width modulation signal to a first pulse expander;
a current balance circuit, configured to compare a first phase current with a second phase current and to provide a current error signal to said first pulse expander;
and
said first pulse expander, coupled to said current balance circuit and to said pulse width modulator, wherein said first pulse expander is configured to add a delay in a turn-off time to said primary pulse width modulation signal output from a PWM comparator, and to produce a secondary pulse modulation signal, wherein said delay varies linearly with said current error signal.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

16/131,799Filed 14 Sep 2018

Published

19 Mar 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 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 1/088
Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters: for the…
H02M 1/0048
Details of apparatus for conversion: circuits or arrangements for reducing losses
H02M 3/1584
Including plural semiconductor devices as final control devices for a single load: with a plurality of power processing stages connected in parallel

Current Balance Feedback Circuit and Method to Improve the Stability of a Multi-Phase Converter

Life of this patent

Current Balance Feedback Circuit and Method to Improve the Stability of a Multi-Phase Converter

Life of this patent

Abstract

Claims22