US 6,982,517 B2
Circuit system for discharging a buffer capacitor used for supplying high voltage to a control unit, in particular a control unit for actuating a piezoelectric output stage
Joerg Reineke, Ditzingen (Germany); and Markus Haederle, Gruibingen (Germany)
Assigned to Robert Bosch GmbH, Stuttgart (Germany)
Filed on Oct. 21, 2002, as Appl. No. 10/274,695.
Claims priority of application No. 101 52 270 (DE), filed on Oct. 20, 2001.
Prior Publication US 2003/0099071 A1, May 29, 2003
Int. Cl. H01L 41/08 (2006.01)
U.S. Cl. 310—316.03 13 Claims
OG exemplary drawing
 
1. A circuit system for discharging a buffer capacitor, comprising:
a control unit including a piezoelectric output stage to receive a high voltage from the buffer capacitor; and
a plurality of electronic elements to permit a discharge of the buffer capacitor and to prevent a recharge of the buffer capacitor after one of the following is satisfied: the control unit is isolated from a piezoelectric element; and the control unit is switched off.