US 10,897,204 B2 · Control method and control circuit for improving dynamic response of switching power supply

Abstract

A method of controlling an isolated converter can include: (i) sampling and holding an output voltage of the isolated converter during a present switching cycle to generate a reference voltage signal that is proportional to the output voltage; (ii) comparing, in a predetermined time interval before a next switching cycle, the output voltage against the reference voltage signal, and activating a wake-up signal when the output voltage is less than the reference voltage signal, in order to control a voltage at a secondary winding to represent a variation of the output voltage; (iii) detecting a voltage of the primary winding or the secondary winding, and generating a voltage detection signal; and (iv) controlling the power switch according to the voltage detection signal, in order to maintain the output voltage as an expected voltage.

Claims23

Dependent claims

A method of controlling an isolated converter, the method comprising:

a) determining whether an output voltage of said isolated converter has decreased by a predetermined percentage, wherein said isolated converter comprises a transformer having primary and secondary windings, and a power switch coupled to said primary winding;
b) activating a wake-up signal when said output voltage has decreased by said predetermined percentage;
c) controlling a secondary voltage across said secondary winding in accordance with said wake-up signal;
and
d) controlling an on state of said power switch to prevent the decrease of said output voltage in accordance with the voltage variation of said secondary voltage to improve transient response.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/958,207Filed 20 Apr 2018 · continuation

Priority

CN 2014 1 034036617 Jul 2014

Published

US 2018/0241314 A123 Aug 2018

Granted

19 Jan 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02M 3/33507
Using semiconductor devices only: with automatic control of the output voltage or current, e.g. flyback converters
H02M 3/33576
Having several active switching elements: having at least one active switching element at the secondary side of an isolation transformer
H02M 3/1566
With automatic control of output voltage or current, e.g. switching regulators: with means for compensating against rapid load changes, e.g. with…
H02M
Apparatus for conversion between ac and ac, between ac and dc, or

Family

Application14/793,976Parent of this continuation · filed 8 Jul 2015

US 2018/0241314 A1Pre-grant publication · published 23 Aug 2018

US 9,966,856 B2Parent of this continuation

US 2016/0020700 A1Published application

US 10,897,204 B2This patent

From the US filing history. Foreign family members aren’t listed.

Control method and control circuit for improving dynamic response of switching power supply

Life of this patent

Control method and control circuit for improving dynamic response of switching power supply

Life of this patent

Abstract

Claims23