Voltage boosting circuit for measuring liquid e.g. oil, level in reservoir of motor vehicle, has diode transforming accumulated charge into overvoltage such that voltage at load terminal is equal to specific value when interrupter is closed

摘要

#CMT# #/CMT# The circuit has a PNP MOSFET (Q4) and a NPN MOSFET (Q5) serving as an interrupter, which passes current when closed and blocks the current when opened. A capacitor (C3) and a resistor (R6) permit to accumulate charge when the interrupter is opened. A diode (D9) transforms the accumulated charge into overvoltage at a load terminal such that the voltage at the load terminal is equal to a specific value when the interrupter is closed. #CMT# : #/CMT# An independent claim is also included for a system for measuring petrol or oil level in a motor vehicle. #CMT#USE : #/CMT# Used for boosting voltage at a load terminal for measuring the level of liquid e.g. petrol or oil, in a reservoir of a motor vehicle (claimed). #CMT#ADVANTAGE : #/CMT# The boosting circuit avoids the need for an inductor, thus ensuring electromagnetic compatibility, and reducing cost and encumbrance of the boosting circuit. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a voltage boosting circuit. C3 : Capacitor D9 : Diode Q4 : PNP MOSFET Q5 : NPN MOSFET Ro : Load R6 : Resistor.