EP0379346A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power conversion unit and module for its construction
Assignee: Fuji Electric Co Ltd
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Filing: 1990-01-17
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Granted: —
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Expires: 2010-01-17
Abstract
Abstract Power switching elements (1,7 to 6,12) are connected across a D.C. power supply (25) to provide a three-phase voltage output. A snubber circuit is provided as a series arrangement of an asymmetrical voltage element (19 to 24) and a capacitor (13 to 18) connected in parallel with each power switching element (and/or across the D.C. power supply). The unit can be constructed from modules each comprising the semiconductor components (e.g. 1,7,19) to which the capacitor is connected. The module can be hermetically sealed in a synthetic resin moulding shaped to accommodate the capacitor in an overall rectangular parallelepiped shape of the module.
Inventors
- 👤 Miki Hiroshi
- 👤 Fujiwara Yoshitaka
- 👤 Iida Kiyoshi
- 👤 Takubo Hiromu
- 👤 Shibayama Kunio
- 👤 Kobayashi Shinichi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:51
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/32; H02M1/34; H02M7/00; H02M7/003; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0814; H03K17/08146; H10; H10W; H10W72/00; H10W72/60; H10W90/00; H02M1/346; H10W72/50; H10W72/541; H10W72/547; H10W72/5475; H10W72/651; H10W72/652; H10W72/655; H10W90/701; H10W90/751; H10W90/754; H10W90/761; H10W90/763; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A power-conversion unit employing a snubber circuit and comprising a plurality of semiconductor power switching elements connected across means for supplying electric power, the snubber circuit comprising at least one series-connected arrangement of an asymmetrical voltage element having different voltage drops in respective opposite directions of conduct ion, and a capacitor, said one or more series arrangements being connected across said power supplying means and/or in parallel with each said semiconductor power switching element.
Claim 2
Dependent Claim
74 words
A power-conversion unit employing a snubber circuit and comprising a plurality of semiconductor power switching elements connected across means for supplying electric power, the snubber circuit comprising at least one series-connected arrangement of an asymmetrical voltage element having different voltage drops in respective opposite directions of conduct ion, and a capacitor, said one or more series arrangements being connected across said power supplying means and/or in parallel with each said semiconductor power switching element.
Claim 3
Dependent Claim
17 words
A power conversion unit according to Claim 1, wherein said asymmetrical voltage element comprises a zener diode.
Claim 4
Dependent Claim
154 words
A module for making a power conversion unit according to Claim 1 or Claim 2, wherein said asymmetrical voltage element is a semiconductor element, said module comprising a semiconductor power switching element connected to a semiconductor asymmetrical voltage element, a conductive base to which is secured an electrically insulating substrate, a conductive pattern being formed on the substrate and having conductive electrical connection to one side of the main current path of the power switching element and to the same polarity side of the asymmetrical voltage element, the other side of the asymmetrical voltage element being connected to a first electrode mounted on the substrate and insulated from the conductive pattern, the other side of the main current path of the power switching element being connected to a second electrode mounted on the substrate and insulated from the conductive pattern, a capacitor of the snubber circuit being connected between the first and second electrodes.
Claim 5
Dependent Claim
73 words
A semiconductor module according to anyone of the preceding Claims, wherein said power-switching element and said asymmetrical voltage element are hermetically sealed in a synthetic resin moulding whose surface carries terminals of the semiconductor components for external connection, the moulding being shaped to accommodate said capacitor such that the moulding and capacitor combination does not project beyond a flat connection surface of the module carrying terminals for external connection to an adjacent module.
Claim 6
Dependent Claim
25 words
A module according to Claim 4, wherein the moulding has a corner cut-away portion for accommodating the capacitor adjacent terminals for connection to the capacitor.
Claim 7
Dependent Claim
30 words
A module according to Claim 4, wherein the mould has a central recess between power supply terminals for the power switching element, said central recess serving to accommodate said capacitor.
References Cited (Backward Citations)
No citation records indexed.
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