A dimming circuit for an indicator switch has a control input, a dimming state and a non-dimming state. The dimming circuit is responsive to the presence of a backlight PWM signal at the control input of the dimming circuit to switch to the dimming state and responsive to the absence of the backlight PWM signal at the control input of the dimming circuit to switch to the non-dimming state. In the dimming state a high resistance of the dimming circuit is coupled in series with the indicator LED and a LED drive output of the function control module and in the non-dimming state a low resistance of the dimming circuit is coupled in series with the indicator LED and the LED drive output of the function control module. The high resistance has a resistance higher than the low resistance.
TWO STAGE INDICATOR DIMMING CIRCUIT CONTROLLED BY PWM BACKLIGHTING BACK FEED AND BACKLIGHT CONTROL
ZWEISTUFIGE INDIKATORDIMMERSCHALTUNG GESTEUERT DURCH PWM-RÜCKBELEUCHTUNGRÜCKSPEISUNG UND RÜCKBELEUCHTUNGSSTEUERUNG
CIRCUIT GRADATEUR D'INDICATEUR À DEUX ÉTAGES COMMANDÉ PAR RÉALIMENTATION DE RÉTROÉCLAIRAGE À MODULATION D'IMPULSIONS EN DURÉE ET COMMANDE DE RÉTROÉCLAIRAGE
2018-11-21
Patent
Electronic Resource
English
IPC: | H05B ELECTRIC HEATING , Elektrische Heizung / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein |
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