Resonant DC-DC converter

Patent metadata

Field	Value
Publication number	US-11223287-B2
Application number	US-201816649645-A
Country	US
Kind code	B2
Filing date	Aug 22, 2018
Priority date	Sep 29, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A resonant DC-DC converter includes an inverter circuit, a rectifier circuit and a transformer unit. The inverter circuit is connected to a first terminal of the transformer unit, and the rectifier circuit is connected to a second terminal of the transformer unit. The first and second terminals are galvanically isolated from one another by a first transformer. The transformer unit is configured to adapt a transformation ratio of the transformer unit. The transformer unit has an energy transmission path which includes an inverter and a second transformer, with an input of the energy transmission path being arranged parallel to a primary side of the first transformer and an output of the energy transmission path being arranged in series with the secondary side of the first transformer.

First claim

The invention claimed is:

1. A resonant DC chopper, comprising:
a DC-AC inverter circuit converting a DC input voltage to an AC voltage;
a transformer unit having a first terminal connected to the AC voltage of the DC-AC inverter circuit, a first transformer having a primary winding connected to the first terminal by way of a series connection composed of a capacitance and an inductance and a secondary winding connected to a second terminal of the transformer unit an energy transfer path having an AC-to-AC inverter with an input connected in parallel with the primary winding of the first transformer between the series connection and the first transformer and an output connected to a primary winding of a second transformer having a secondary winding connected in series with the secondary winding of the first transformer such that output voltages of the first transformer and the second transformer are adjusted by varying a voltage amplification of the AC-to-AC inverter; and
a rectifier circuit connected to the second terminal of the transformer unit.

2. The resonant DC chopper of claim 1 , wherein the first transformer has a tap changer.

3. The resonant DC chopper of claim 1 , wherein 75% of a total power is transferred via the first transformer and 25% of the total power is transferred via the energy transfer path.

Assignees

• Siemens Ag

Inventors

• Hergt Martin
• Lutze Marcel
• Nielebock Sebastian
• Pfeifer Markus
• Zocher Markus

Classifications

• H02M3/33573 Primary

  Full-bridge at primary side of an isolation transformer · CPC title

• H02M3/01 Primary

  Resonant DC/DC converters · CPC title

• H02M1/0077

  Plural converter units whose outputs are connected in series · 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

• H02M1/0064

  Magnetic structures combining different functions, e.g. storage, filtering or transformation · CPC title