US 12,308,751 B2
Power conversion apparatus including transformer and operable with reduced common mode noise
Taiki Nishimoto, Osaka (JP); Noriaki Takeda, Osaka (JP); and Naoki Sawada, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/631,838
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jul. 29, 2020, PCT No. PCT/JP2020/029072
§ 371(c)(1), (2) Date Jan. 31, 2022,
PCT Pub. No. WO2021/024879, PCT Pub. Date Feb. 11, 2021.
Claims priority of application No. 2019-143273 (JP), filed on Aug. 2, 2019; application No. 2019-143278 (JP), filed on Aug. 2, 2019; and application No. 2019-143279 (JP), filed on Aug. 2, 2019.
Prior Publication US 2022/0278622 A1, Sep. 1, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/12 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/33573 (2021.05) [H02M 1/123 (2021.05); H02M 3/01 (2021.05); H02M 3/33571 (2021.05)] 12 Claims
OG exemplary drawing
 
1. A power conversion apparatus comprising a transformer, a primary circuit, and a secondary circuit,
wherein the primary circuit is connected to a primary winding of the transformer, has a primary positive bus and a primary negative bus, and includes at least one switching element,
wherein the secondary circuit is connected to a secondary winding of the transformer, has a secondary positive bus and a secondary negative bus, and includes at least one switching element,
wherein the power conversion apparatus further comprises a coupling circuit including at least a first capacitor, and
wherein the power conversion apparatus is characterized by any one of:
(A) being configured such that the primary circuit is an unbalanced circuit and the secondary circuit is a balanced circuit, and having the coupling circuit connected between a center tap of the secondary winding of the transformer, and one of the primary positive bus and the primary negative bus, the center tap of the secondary winding not having any other conductive path to the secondary circuit than the secondary winding,
(B) being configured such that the primary circuit is a balanced circuit and the secondary circuit is an unbalanced circuit, and having the coupling circuit connected between a center tap of the primary winding of the transformer, and one of the secondary positive bus and the secondary negative bus, the center tap of the primary winding not having any other conductive path to the primary circuit than the primary winding, and
(C) being configured such that the primary circuit is a balanced circuit and the secondary circuit is a balanced circuit, and having the coupling circuit connected between a center tap of the primary winding of the transformer, and a center tap of the secondary winding of the transformer, the center tap of the primary winding not having any other conductive path to the primary circuit than the primary winding, and the center tap of the secondary winding not having any other conductive path to the secondary circuit than the secondary winding.