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US 8,525,617 B2Granted
Common-mode filter with coupled inductances
AssigneeSTMicroelectronics (Tours) SAS
InventorJoël Concord
Life of this patent
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Abstract
A common-mode filter including, in series between a first input terminal and a first output terminal, a first and a second positively coupled inductive elements; in series between a second input terminal and a second output terminal, a third and a fourth positively coupled inductive elements; and in series between each midpoint of said series connections of inductive elements and the ground, a capacitive element and a fifth inductive element.
Claims17
A common-mode filter comprising:
- in series between a first input terminal and a first output terminal, first and second positively coupled inductive elements;
- in series between a second input terminal and a second output terminal, third and fourth positively coupled inductive elements;
- in series between each midpoint of said series connections of inductive elements and the ground, a corresponding capacitive element and a fifth inductive element, wherein said capacitive elements are formed by diodes and wherein an additional diode is coupled in series with the fifth inductive element between the anodes of said diodes and ground;
- and wherein said anodes are common anodes.
1 more element
A common-mode filter comprising:
- in series between a first input terminal and a first output terminal, first and second positively coupled inductive elements;
- in series between a second input terminal and a second output terminal, third and fourth positively coupled inductive elements;
- and
- in series between each midpoint of said series connections of inductive elements and the ground, a corresponding capacitive element and a fifth inductive element, wherein an additional capacitive element is connected in parallel on the fifth inductive element.
1 more element
A common-mode filter comprising:
- a first inductive element and a second inductive element connected in series between a first input terminal and a first output terminal, wherein the first and second inductive elements are positively coupled;
- a third inductive element and a fourth inductive element connected in series between a second input terminal and a second output terminal, wherein the third and fourth inductive elements are positively coupled;
- a first capacitive element connected between a midpoint of the series-connected first and second inductive elements and a common node;
- a second capacitive element connected between a midpoint of the series-connected third and fourth inductive elements and the common node;
- and
- a fifth inductive element connected between the common node and ground, wherein the common node is isolated from ground by the fifth inductive element.
3 more elements
Dependencies are inferred from the claim text.