Interface module for a sending section and a receiving section

• US 5,999,066 A
• Filed: 09/05/1997
• Issued: 12/07/1999
• Est. Priority Date: 09/06/1996
• Status: Expired due to Fees

• Current Assignee: Toko KK
• Original Assignee: Toko KK
• Inventors: Nakajima, Katsuhito, Komine, Yorio, Saito, Hideaki, Sasanuma, Hitoshi
• Primary Examiner(s): LEE, BENNY T
• Application Number:
  US08/924,132
• Time in Patent Office: 823 Days
• Field of Search: 333/126, 333/129, 333/132, 333/134, 333/175, 333/185
• US Class Current: 333/132
• CPC Class Codes: H03H 7/46 Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source for use in multiplex transmission systems H04J1/00

Abstract

An interface module having a receiving section and a sending section, the receiving section being provided with a low pass filter, an isolation transformer and a common mode choke transformer, and the sending section is provided with a low pass filter, an isolation transformer and a common mode choke transformer and they are integrated with each other, wherein the receiving section and the sending section are independently formed on a board of the interface module, and the low pass filter at the receiving section and the low pass filter at the sending section are respectively covered by shield cases.

Claims

1. An interface module having a receiving section and a sending section, said receiving section being provided with a low pass filter, an isolation transformer and a common mode choke transformer, and said sending section being provided with a low pass filter, an isolation transformer and a common mode choke transformer,

wherein said receiving section and said sending section are independently formed on a board of said interface module, and said low pass filter of said receiving section and said low pass filter of said sending section are respectively covered by corresponding shield cases, and

said isolation transformer and said common mode choke transformer of said receiving section and said isolation transformer and said common mode choke transformer of said sending section are disposed between said low pass filter of said receiving section and said low pass filter of said sending section.

2. An interface module having a receiving section and a sending section integrated with respect to each other and provided on a circuit board of said interface module, said receiving section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner, and said sending section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner;

said low pass filter of said receiving section having a first input terminal, a first output terminal, a second input terminal and a second output terminal, and comprising a first coil connected between said first input terminal and said first output terminal, a second coil connected between said second input terminal and said second output terminal, a first capacitor connected between said first input terminal and said second input terminal and a second capacitor connected between said first output terminal and said second output terminal;

said first and second coils being wound around respective wrap sections of a first ferrite drum core, said wrap sections being separated from each other by a central wrap section of said first ferrite drum core, said first and second coils and said first and second capacitors being connected to respective terminals, and said first and second coils and said first and second capacitors being sealed with resin and being covered with a first shield case, thereby constituting a balance type low pass filter of said receiving section;

said low pass filter of said sending section having a third input terminal, a third output terminal, a fourth input terminal and a fourth output terminal, and comprising a third coil connected between said third input terminal and said third output terminal, a fourth coil connected between said fourth input terminal and said fourth output terminal, a third capacitor connected between said third input terminal and said fourth input terminal and a fourth capacitor connected between said third output terminal and said fourth output terminal;

said third and fourth coils being wound around respective wrap sections of a second ferrite drum core, said wrap sections being separated from each other by a central wrap section of said second ferrite drum core, said third and fourth coils and said third and fourth capacitors being connected to respective terminals, and said third and fourth coils and said third and fourth capacitors being sealed with resin and being covered with a second shield case, thereby constituting a balance type low pass filter of said sending section;

said isolation transformer and said common mode choke transformer of said receiving section comprising a first toroidal core of said isolation transformer, a second toroidal core of said common mode choke transformer, and a first base having a plurality of terminals;

said first and second toroidal cores being stacked on said first base and being attached thereto, and said isolation transformer and said common mode choke transformer of said receiving section being connected through respective terminals of said first base and integrated together;

said isolation transformer and said common mode choke transformer of said sending section comprising a third toroidal core of said isolation transformer, a fourth toroidal core of said common mode choke transformer, and a second base having a plurality of terminals;

said third and fourth toroidal cores being stacked on said second base and being attached thereto, and said isolation transformer and said common mode choke transformer of said sending section being connected through respective terminals of said second base and integrated together; and

said low pass filter of said receiving section, said isolation transformer and said common mode choke transformer of said receiving section, said low pass filter of said sending section and said isolation transformer and said common mode choke transformer of said sending section being provided on said circuit board of said interface module, with said receiving section and said sending section being separated from each other, thereby providing said receiving section and said sending section independently on said circuit board of said interface module.

3. An interface module of claim 2,

wherein said isolation transformer and said common mode choke transformer of said receiving section, and said isolation transformer and said common mode choke transformer of said sending section are provided between said low pass filter of said receiving section and said low pass filter of said sending section on said circuit board of said interface module.

4. An interface module having a receiving section and a sending section integrated with respect to each other and provided on a circuit board of said interface module, said receiving section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner, and said sending section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner;

said low pass filter of said receiving section having a first input terminal, a first output terminal, a second input terminal and a second output terminal, and comprising a first coil which is composed of a plurality of coils connected together in series between said first input terminal and said first output terminal, a second coil which is composed of a plurality of coils connected together in series between said second input terminal and said second output terminal, and a plurality of first capacitors connected between said first coil and said second coil;

said first coil and said second coil being wound around respective wrap sections of a first ferrite drum core, said respective wrap sections being separated from each other by a central wrap section of said first ferrite core, said first coil and said second coil and said plurality of first capacitors being connected to respective terminals, and said first coil and said second coil and said plurality of first capacitors being sealed with resin and being covered with a first shield case, thereby constituting a balance type low pass filter of said receiving section;

said low pass filter of said sending section having a third input terminal, a third output terminal, a fourth input terminal and a fourth output terminal, and comprising a third coil which is composed of a plurality of coils connected together in series between said third input terminal and said third output terminal, a fourth coil which is composed of a plurality of connected together in series between said fourth input terminal and said fourth output terminal, and a plurality of second capacitors connected between said third and fourth coils;

said third and fourth coils being wound around respective wrap sections of a second ferrite drum core, said wrap sections being separated from each other by a central wrap section of said second ferrite drum core, said third and fourth coils and said plurality of second capacitors being connected to respective terminals, and said third and fourth coils and said plurality of second capacitors being sealed with resin and being covered with a respective shield case, thereby constituting a balance type low pass filter of said sending section;

said isolation transformer and said common mode choke transformer of said receiving section comprising a first toroidal core of said isolation transformer, a second toroidal core of said common mode choke transformer, and a first base having a plurality of terminals;

said first and second toroidal cores being stacked on said first base and being attached thereto, and said isolation transformer and said common mode choke transformer of said receiving section being connected through respective terminals of said first base to be integrated together;

said isolation transformer and said common mode choke transformer of said sending section comprising a third toroidal core of said isolation transformer, a fourth toroidal core of said common mode choke transformer, and a second base having a plurality of terminal;

said third and fourth toroidal cores being stacked on said second base and being attached thereto, and said isolation transformer and said common mode choke transformer of said sending section being connected through respective terminals of said second base to be integrated together; and

said low pass filter of said receiving section, said isolation transformer and said common mode choke transformer of said receiving section, said low pass filter of said sending section and said isolation transformer and said common mode choke transformer of said sending section being provided on said circuit board of said interface module, with said receiving section and said sending section separated from each other, thereby providing said receiving section and said sending section independently on said circuit board of said interface module.

5. An interface module of claim 4,

wherein said isolation transformer and common mode choke transformer of said receiving section, and said isolation transformer and said common mode choke transformer of said sending section are provided between said low pass filter of said receiving section and said low pass filter of said sending section on said circuit board of said interface module.

6. An interface module having a receiving section and a sending section, said receiving section being provided with a low pass filter, an isolation transformer and a common mode choke transformer, and said sending section being provided with a low pass filter, an isolation transformer and a common mode choke transformer,

wherein said receiving section and said sending section are independently disposed on a board of said interface module;

in said low pass filter of said receiving section, a plurality of coils for said low pass filter of said receiving section are wound around a first drum core, a plurality of capacitors connected to said plurality of coils are contained in a first base which supports said first drum core, said plurality of coils and said plurality of capacitors are covered with a first shield case, and accordingly said low pass filter of said receiving section is configured as a balance type low pass filter;

in said low pass filter of said sending section, a plurality of coils for said low pass filter of said sending section are wound around a second drum core, a plurality of capacitors connected to said plurality of coils are contained in a second base which supports said second drum core, said plurality of coils and said plurality of capacitors are covered with a second shield case, and accordingly said low pass filter of said sending section is configured as a balance type low pass filter; and

said isolation transformer and said common mode choke transformer of said receiving section and said isolation transformer and said common mode choke transformer of said sending section are disposed between said low pass filter of said receiving section and said low pass filter of said sending section.

7. An interface module according to claim 6,

wherein said isolation transformer of said receiving section and said common mode choke transformer of said receiving section comprise a first toroidal core which forms said isolation transformer of said receiving section, a second toroidal core which forms said common mode choke transformer of said receiving section, and a third base having a plurality of terminals;

said first and second toroidal cores being stacked on said third base and being attached thereto, and said isolation transformer of said receiving section and said common mode choke transformer of said receiving section being connected through respective terminals of said third base and integrated together;

wherein said isolation transformer of said sending section and said common mode choke transformer of said sending section comprise a third toroidal core which forms said isolation transformer of said sending section, a fourth toroidal core which forms said common mode choke transformer of said sending section, and a fourth base having a plurality of terminals;

said third and fourth toroidal cores being stacked on said fourth base and being attached thereto, and said isolation transformer of said sending section and said common mode choke transformer of said sending section being connected through respective terminals of said fourth base and integrated together.

8. An interface module having a receiving section and a sending section integrated with respect to each other and provided on a circuit board of said interface module, said receiving section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner, and said sending section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner;

said low pass filter of said receiving section having a first input terminal, a second input terminal, a first output terminal and a second output terminal, and comprising a first coil connected between said first input terminal and said first output terminal, a second coil connected between said second input terminal and said second output terminal, a first capacitor connected between said first input terminal and said second input terminal and a second capacitor connected between said first output terminal and said second output terminal;

said first and second coils being wound around respective wrap sections of a first ferrite drum core, said respective wrap sections being separated from each other by a central wrap section of said first ferrite drum core, and said first capacitor and said second capacitor being enclosed in a first base which supports said first ferrite drum core;

said first and second coils, and said first and second capacitor being covered with a first shield case, thereby constituting a balance type low pass filter of said receiving section;

said low pass filter of said sending section having a third input terminal, a fourth input terminal, a third output terminal and a fourth output terminal, and comprising a third coil connected between said third input terminal and said third output terminal, a fourth coil connected between said fourth input terminal and said fourth output terminal, a third capacitor connected between said third input terminal and said fourth input terminal and a fourth capacitor connected between said third output terminal and said fourth output terminal;

said third and fourth coils being wound around respective wrap sections of a second ferrite drum core, said respective wrap sections being separated from each other by a central wrap section of said second ferrite drum core, and said third capacitor and said fourth capacitor being enclosed in a second base which supports said second ferrite drum core;

said third and fourth coils, and said third and fourth capacitors being covered with a second shield case, thereby constituting a balance type low pass filter of said sending section;

said isolation transformer and said common mode choke transformer of said receiving section comprising a first toroidal core of said isolation transformer, a second toroidal core of said common mode choke transformer, and a third base having a plurality of terminals;

said first and second toroidal cores being stacked on said third base and being attached thereto, and said isolation transformer and said common mode choke transformer of said receiving section being connected through respective terminals of said third base and integrated together;

said isolation transformer and said common mode choke transformer of said sending section comprising a third toroidal core of said isolation transformer, a fourth toroidal core of said common mode choke transformer, and a fourth base having a plurality of terminals;

said third and fourth toroidal cores being stacked on said fourth base and being attached thereto, and said isolation transformer and said common mode choke transformer of said sending section being connected through respective terminals of said fourth base and integrated together; and

said low pass filter of said receiving section, said isolation transformer and said common mode choke transformer of said receiving section and said low pass filter of said sending section and said isolation transformer and said common mode choke transformer of said sending section being provided on said circuit board of said interface module, with said receiving section and said sending section being separated from each other, thereby providing said receiving section and said sending section independently on said circuit board of said interface module.

9. An interface module of claim 8,

wherein said isolation transformer and said common mode choke transformer of said receiving section and said isolation transformer and said common mode choke transformer of said sending section are provided between said low pass filter of said receiving section and said low pass filter of said sending section on said circuit board of said interface module.

10. An interface module having a receiving section and a sending section integrated with respect to each other and provided on a circuit board of said interface module, said receiving section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner, and said sending section including a low pass filter, an isolation transformer and a common mode choke transformer connected in a cascade connection manner;

said low pass filter of said receiving section having a first input terminal, a second input terminal, a first output terminal and a second output terminal, and comprising a first coil which is composed of a plurality of coils connected together in series between said first input terminal and said first output terminal, a second coil which is composed of a plurality of coils connected together in series between said second input terminal and said second output terminal, and a plurality of first capacitors connected between said first coil and said second coil;

said first and second coils being wound around respective wrap sections of a first ferrite drum core, said respective wrap sections being separated from each other by a central wrap section of said first ferrite drum core, and said plurality of first capacitors being enclosed in a first base which supports said first ferrite drum core;

said first and second coils and said plurality of capacitors being covered with a first shield case, thereby constituting a balance type low pass filter of said receiving section;

said low pass filter of said sending section having a third input terminal, a third output terminal, a fourth input terminal and a fourth output terminal, and comprising a third coil which is composed of a plurality of coils connected together in series between said third input terminal and said third output terminal, a fourth coil which is composed of a plurality of coils connected together in series between said fourth input terminal and said fourth output terminal, and a plurality of second capacitors connected between said third and fourth coils;

said third and fourth coils being wound around respective wrap sections of a second ferrite drum core, and said respective wrap sections being separated from each other by a central wrap section of said second ferrite drum core;

said plurality of second capacitors being enclosed in a second base which supports said second drum core;

said third and fourth coils and said plurality of second capacitors being covered with a second shield case, thereby constituting a balance type low pass filter of said sending section;

said isolation transformer and said common mode choke transformer of said receiving section comprising a first toroidal core of said isolation transformer, a second toroidal core of said common mode choke transformer, and a third base having a plurality of terminals;

said first and second toroidal cores being stacked on said third base and being attached thereto, and said isolation transformer and said common mode choke transformer of said receiving section being connected through respective terminals of said third base to be integrated together;

said isolation transformer and said common mode choke transformer of said sending section comprising a third toroidal core of said isolation transformer, a fourth toroidal core of said common mode choke transformer, and a fourth base having terminals;

said third and fourth toroidal cores being stacked on said fourth base and being attached thereto, and said isolation transformer and said common mode choke transformer of said sending section being connected through respective terminals of said fourth base and integrated together; and

said low pass filter of said receiving section, said isolation transformer and said common mode choke transformer of said receiving section, said low pass filter of said sending section and said isolation transformer and said common mode choke transformer of said sending section being provided on said circuit board of said interface module, with said receiving section and said sending section being separated from each other, thereby providing said receiving section and said sending section independently on said circuit board of said interface module.

11. An interface module of claim 10,

wherein said isolation transformer and said common mode choke transformer of said receiving section, and said isolation transformer and said common mode choke transformer of said sending section are provided between said low pass filter of said receiving section and said low pass filter of said sending section on said circuit board of said interface module.