Electronic blinker
AssigneeTEMIC Semiconductor GmbH
InventorsRoland Schropp, Andreas Fritz
Life of this patent
Estimating the term…
Abstract
An electronic blinker circuit for a vehicle has an analog relay control section (24) and a digital circuit control section (25) arranged in a housing having only eight terminals. A holding circuit in the digital circuit section prevents an unintended oscillation when relay contacts are opened while a manual warn-blinker switch is still closed. When the engine ignition is switched off the blinker circuit requires a low quiescent current flow that is typically only 10 .mu.A.
Claims8
An electronic blinker for a vehicle, said blinker comprising an input comparator circuit (26) having a warn-blinking input (6) and a reference input (42), a warn-blinker switch (20) connected to said warn-blinking input (6), a threshold signal supply connected to said reference input (42), a voltage supply circuit (28) with a terminal (2) for connection to a battery as a voltage supply for the electronic blinker, a relay driver circuit (27) having an input connected to said supply circuit (28) and a relay driving output (1) for controlling a blinker relay (17), further including a control unit (30) for the timed open loop blinking control of light and dark phases of blinker lamps (19), said input comparator circuit (26) having an output connected through a first conductor (36) to said voltage supply circuit (28) when said warn-blinker switch (20) is closed for supplying an operating voltage to said relay driver circuit, a signal holding circuit (29) connected to said output of said input comparator circuit (26) through said first conductor (36), said signal holding circuit (29) being adapted for setting a holding signal during light phases when said warn-blinker switch (20) is closed, a databus (41) connecting said control unit (30) to said relay driver circuit (27) for controlling a timing sequence of light and dark phases, a second conductor (38) connecting said control unit (30) to said signal holding circuit (29) for resetting said holding signal when the warn-blinker switch (20) is open, and wherein said signal holding circuit (29) is connected through a third conductor (39) to said voltage supply circuit (28) for maintaining said voltage supply when said holding signal is set and for switching-off said voltage supply when said holding signal is reset.
Dependencies are inferred from the claim text.