Back to results
US 2001/0054846 A1Published application
Fault tolerant air bag bus system without transformer
AssigneeKoninklijke Philips Electronics N.V.
InventorsHendrik Boezen, Aloysius Johannes Maria Boomkamp, Martinus Bredius, Peter Buehring, Patrick Willem Hubert Heuts, Abraham Klaas Van Den Heuvel, Egon Joehnk, Maarten Teunis Visser, Ruurd Anne Visser
Life of this patent
Estimating the term…
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.
Claims2
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).
4 more elements
Dependencies are inferred from the claim text.