Title:
POWER CONVERTER
Document Type and Number:
WIPO Patent Application WO/2017/173603
Kind Code:
A1
Abstract:
A power converter comprises a transformer (Tr) with a primary and a secondary, and a capacitor (Cr) and an inductor (Lr) serially connected with the primary of the transformer. The capacitor, the inductor and a magnetizing inductor (Lm) of the transformer form an LLC resonant circuit. The power converter further comprises a first current sensor (CT1) and a second current sensor (CT2). The first current sensor comprises the inductor and is configured to sense, via the inductor, a current passing through the primary of the transformer. The second current sensor comprises the primary and is configured to sense, via the primary, a current passing through the magnetizing inductor of the transformer. A current passing through the secondary is determined from a difference obtained based on the sensed current passing through the primary of the transformer and the sensed current passing through the magnetizing inductor. The power converter has the advantage that it is possible to provide an accurate sensed current at a low cost without load limitation, and it is also possible to perform a cycle-by-cycle protection function since a load waveform can be restored. In addition, another power converter is also provided, which has a structure for reducing power circulation among parallel windings (Wa, Wb) of the transformer.
Inventors:
CHEN GENG (CN)
Application Number:
PCT/CN2016/078542
Publication Date:
October 12, 2017
Filing Date:
April 06, 2016
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (PUBL) (SE)
CHEN GENG (CN)
CHEN GENG (CN)
International Classes:
H02M3/335
Foreign References:
| US20140362616A1 | 2014-12-11 | |||
| CN102446620A | 2012-05-09 | |||
| CN101425751A | 2009-05-06 | |||
| US6477064B1 | 2002-11-05 | |||
| JP3175388B2 | 2001-06-11 |
Other References:
See also references of EP 3440768A4
Attorney, Agent or Firm:
KING & WOOD MALLESONS (CN)
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