Modular parallel technique for resonant converter

Patent metadata

Field	Value
Publication number	US-10491123-B2
Application number	US-201615757552-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 18, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

An LLC resonant converter includes a first phase with a first primary circuit and a second phase with a second primary circuit. The first primary circuit includes a first shared inductor, and the second primary circuit includes a second shared inductor. The first and second shared inductors are connected in parallel with each other. The first and second primary circuits do not include a capacitor that is connected in parallel with each other.

First claim

What is claimed is:

1. An LLC resonant converter comprising:
a voltage input;
a voltage output;
a first phase including:
a first transformer with first primary and first secondary windings;
a first primary circuit connected to the voltage input and the first primary winding, the first primary circuit including:
a first resonant capacitor;
a first magnetizing inductor connected in parallel across the first primary winding; and
a first resonant inductor; wherein
the first resonant capacitor, the first magnetizing inductor, and the first resonant inductor are connected in series;

a first secondary circuit connected to the first secondary winding and the voltage output, the first secondary circuit including a first rectifying circuit; and
a second phase including:
a second transformer with second primary and second secondary windings;
a second primary circuit connected to the voltage input and the second primary winding, the second primary circuit including:
a second resonant capacitor;
a second magnetizing inductor connected in parallel across the second primary winding; and
a second resonant inductor; wherein
the second resonant capacitor, the second magnetizing inductor, and the second resonant inductor are connected in series;

a second secondary circuit connected to the second secondary winding and the voltage output, the second secondary circuit including a second rectifying circuit; wherein

the first primary circuit includes a first shared inductor with first and second ends;
the second primary circuit includes a second shared inductor with first and second ends;
the first and second shared inductors are connected in parallel with each other such that the first ends of the first and second shared inductors are directly connected to each other, and the second ends of the first and second shared inductors are directly connected to each other; and
the first and second primary circuits do not include a capacitor that is connected in parallel with each other.

2. The LLC resonant converter of claim 1 , wherein the first and second rectifying circuits include synchronous rectifiers.

3. The LLC resonant converter of claim 1 , wherein the first phase includes a first output capacitor, and the second phase includes a second output capacitor.

4. The LLC resonant converter of claim 1 , further comprising at least one additional phase including at least one additional shared inductor; wherein
the at least one additional shared inductor is connected in parallel with the first and second shared inductors.

5. The LLC resonant converter of claim 1 , wherein:
the first shared inductor is the first resonant inductor; and
the second shared inductor is the second resonant inductor.

Assignees

• Murata Manufacturing Co

Inventors

• Wang Hongliang
• Chen Yang
• Liu Yan-Fei
• Afsharian Jahangir
• Yang Zhihua
• Gong Bing

Classifications

• H02M3/3376

  with automatic control of output voltage or current · CPC title

• H02M3/33576

  having at least one active switching element at the secondary side of an isolation transformer · CPC title

• H02M3/285 Primary

  Single converters with a plurality of output stages connected in parallel (parallel operation of a plurality of converters in DC distribution networks H02J1/10) · CPC title

• H02M3/33592

  having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer · CPC title

• H02M1/0058

  by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero (using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826) · CPC title