Electric power converter

• US 9,160,237 B2
• Filed: 07/08/2013
• Issued: 10/13/2015
• Est. Priority Date: 07/09/2012
• Status: Active Grant

• Current Assignee: DENSO Corporation, Nippon Soken, Inc.
• Original Assignee: DENSO Corporation, Nippon Soken, Inc.
• Inventors: Itou, Hideki, Handa, Yuuichi, Hayashi, Yuji
• Primary Examiner(s): BERHANE, ADOLF D
• Application Number:
  US13/936,710
• Publication Number:
  US 20140009971A1
• Time in Patent Office: 827 Days
• Field of Search: 363/15, 363/17, 363/20, 363/21.01, 363/144
• US Class Current: 1/1
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 3/33507 with automatic control of the output voltage or current, e.g. flyback converters H02M3/33561, H02M3/33569 take precedence
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer

Abstract

An electric power converter has a switching circuit section, a transformer, a rectifier, and a noise filtering element. The rectifier is connected to a secondary coil of the transformer. A closed circuit where the noise current flows is formed by the secondary coil, the rectifier, and the noise filtering element. The transformer and the noise filtering element are disposed in a position next to each other. The secondary coil and the noise filtering element are electrically connected to each other through a terminal for a coil that is a terminal of the secondary coil and a terminal for a filter that is a terminal of the noise filtering element. The terminal for the coil and the terminal for the filter are disposed in a position between the transformer and the noise filtering element.

Claims

1. An electric power converter comprising:

a switching circuit section that is composed of switching elements;

a transformer that has a primary coil connected to the switching circuit section and a secondary coil;

a rectifier connected to the secondary coil of the transformer; and

a noise filtering element that allows a specific noise current to pass;

wherein;

a closed circuit where the noise current flows is formed by the secondary coil, the rectifier, and the noise filtering element;

an LC filter circuit section electrically connected to a cathode of the rectifier;

the noise filtering element is a capacitor;

the transformer and the noise filtering element are disposed in a position next to each other;

the secondary coil and the noise filtering element are electrically connected to each other through a terminal for a coil that is a terminal of the secondary coil and a terminal for a filter that is a terminal of the noise filtering element;

the terminal for the coil and the terminal for the filter are disposed in a position between the transformer and the noise filtering element;

the noise filtering element is connected between (i) a connection point of the cathode of the rectifier and the LC filter circuit section and (ii) the terminal for the coil that is the terminal of the secondary coil;

the rectifier and the noise filtering element are built in a single module;

the rectifier and the noise filtering element are disposed on a single metal plate,

the module includes a main element body that has the rectifier and the noise filtering element therein, a terminal for rectification for connecting the rectifier to the secondary coil, and a terminal for a filter;

the terminal for rectification and the terminal for the filter are respectively projected towards the secondary coil from the main element body;

the terminal for the coil is projected towards the module;

a rectifier connecting terminal of the secondary coil is projected towards the module; and

the terminal for rectification of the module and the rectifier connecting terminal of the secondary coil are electrically connected.

2. The electric power converter according to claim 1, wherein,

the terminal for the coil and the terminal for the filter are connected directly.

3. The electric power converter according to claim 2, wherein,

the single metal plate, on which the rectifier and the noise filtering element are disposed, is configured for mounting the switching circuit section and the transformer;

the single metal plate is grounded; and

the terminal for the coil and the terminal for the filter are overlapped and fastened together on the single metal plate.

4. The electric power converter according to claim 1, wherein,

the single metal plate, on which the rectifier and the noise filtering element are disposed, is configured for mounting the switching circuit section and the transformer;

and

the terminal for the coil and the terminal for the filter are connected to different positions on the single metal plate, respectively.