Fault tolerant air bag bus system without transformer
First Claim
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1. An air bag system comprising:
- igniters (10, 12) for firing air bags;
a firing bus (32) for interconnecting the igniters (10, 12);
a bus driver (26) for energizing the firing bus (32);
a main energy reserve capacitor (14) for providing a supply voltage to the air bag system;
a further energy reserve capacitor (34) coupled in parallel to the main energy capacitor (14) by means of switches (36, 38) to receive the supply voltage; and
a power supply (40) for converting the supply voltage to a working voltage for the bus driver (26).
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Abstract
A fault tolerant air bag system needs a floating supply, which supply conventionally is made by means of a DC-DC converter with a transformer. By splitting the main energy reserve capacitor (14) into two capacitors (14, 34), and coupling one of the capacitors (34) to the other (14) by means of switches (36, 38) which open during a crash, no transformer is needed any more.
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Citations
2 Claims
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1. An air bag system comprising:
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igniters (10, 12) for firing air bags;
a firing bus (32) for interconnecting the igniters (10, 12);
a bus driver (26) for energizing the firing bus (32);
a main energy reserve capacitor (14) for providing a supply voltage to the air bag system;
a further energy reserve capacitor (34) coupled in parallel to the main energy capacitor (14) by means of switches (36, 38) to receive the supply voltage; and
a power supply (40) for converting the supply voltage to a working voltage for the bus driver (26). - View Dependent Claims (2)
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Specification
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Current AssigneeNXP B.V. (NXP Semiconductors NV)
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Original AssigneeKoninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
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InventorsBredius, Martinus, Joehnk, Egon, Visser, Maarten Teunis, Visser, Ruurd Anne, Heuts, Patrick Willem Hubert, Boezen, Hendrik, Boomkamp, Aloysius Johannes Maria, Van Den Heuvel, Abraham Klaas, Buehring, Peter
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Primary Examiner(s)FLEMING, FRITZ M
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Application NumberUS09/837,947Publication NumberTime in Patent Office649 DaysField of Search307/9.1, 307/10.1, 307/121, 280/735, 701/45-47US Class Current307/10.1CPC Class CodesB60R 2021/01075 between the airbag control ...B60R 21/0173 Diagnostic or recording mea...H02J 7/345 using capacitors as storage...
