Switched hot swap controller
First Claim
1. An electric circuit for minimizing in-rush current when hot-swapping an electronic board, wherein said electronic board comprises a circuit characterized by a series inductance and parallel capacitance, said series inductance limiting the rate of increase in input current to said circuit, said electric circuit for minimizing in-rush current comprising:
- a switch intermediate to an input voltage terminal and said circuit, said switch having a control terminal for selectively controlling said switch between a conducting state and a non-conducting state;
a current sense circuit intermediate to said input voltage terminal and said switch; and
,a processing unit coupled to said current sense circuit and said control terminal of said switch, said processing unit selectively controlling said switch between said conducting state and said non-conducting state in response to current flowing through said current sense circuit, wherein a duration of said conducting state is gradually increased as current charges said parallel capacitance of said circuit.
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Accused Products
Abstract
The invention describes an electric circuit (100), a method and a computer program for hot-swapping an electronic board in a telecommunication system, where the increase in current in the electric circuit is controlled by a microcontroller (130) switching a power transistor in a switching circuit (150) so as to gradually increase the capacitor voltage for the electronic board. The current level is measured either in the microcontroller (130) itself or in an external current sense circuit (140) and compared to a maximum current level.
9 Citations
1 Claim
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1. An electric circuit for minimizing in-rush current when hot-swapping an electronic board, wherein said electronic board comprises a circuit characterized by a series inductance and parallel capacitance, said series inductance limiting the rate of increase in input current to said circuit, said electric circuit for minimizing in-rush current comprising:
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a switch intermediate to an input voltage terminal and said circuit, said switch having a control terminal for selectively controlling said switch between a conducting state and a non-conducting state; a current sense circuit intermediate to said input voltage terminal and said switch; and
,a processing unit coupled to said current sense circuit and said control terminal of said switch, said processing unit selectively controlling said switch between said conducting state and said non-conducting state in response to current flowing through said current sense circuit, wherein a duration of said conducting state is gradually increased as current charges said parallel capacitance of said circuit.
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Specification
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- Resources
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Current AssigneeTelefonaktiebolaget LM Ericsson
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Original AssigneeTelefonaktiebolaget LM Ericsson
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InventorsSander, Sverker, Fasth, Kjell-Arne, Sköld, Claes-Göran
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Primary Examiner(s)Barnie, Rexford N
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Assistant Examiner(s)Kitov, Zeev V
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Application NumberUS12/091,973Publication NumberTime in Patent Office2,345 DaysField of Search361/93.9, 361/98, 327/127, 327/538US Class Current361/93.8CPC Class CodesH02H 9/001 limiting speed of change of...H02H 9/004 in connection with live-ins...
