Integrated circuit with an internal noise filter for direction i

Details Integrated circuit with an internal noise filter for direction i Integrated circuit with an internal noise filter for direction i

1997-05-28

1999-07-27

Pascal, Robert

Electric lamp and discharge devices: systems

Special application

Vehicle

315200A, 340475, 307 108, B60Q 138

Patent

active

059295694

ABSTRACT:
An integrated circuit for a flasher system which is inserted in a current path connected to direction indicator lamps of a vehicle for cyclically opening and closing the current path so as to flash the direction indicator lamps. The integrated circuit 21 includes a resistor 213B connected between a pin 21B of the integrated circuit and an input 213E of a comparator 213A, which is provided in a lamp burnout detecting section 213 of the integrated circuit 21. A noise filter is formed of the resistor 213B and the capacitor 213C connected to the input 213E of the comparator 213A. A resistor 212B is connected between a pin 21E of the integrated circuit and an input 212E of a comparator 212A in an oscillator section 212 of the integrated circuit 21. A noise filter is formed of the resistor 212B and a parasitic capacitor 212C connected to the input 212E of the comparator 212A. An input end and an output end of the comparator 212A are connected together through a hysteresis setting element 212F. A resistance 211B is connected between a terminal end 211E of a comparator 211A in a switch inputting section 211 and a terminal 21G of the integrated circuit 21. A noise filter is formed by the resistance 211B and a capacitor 211C provided at the terminal end 211E of the comparator 211A. A delay circuit 211F is provided in the switch inputting section 211. The flasher system prevents erroneous operation of direction indicator lamps due to noise or chattering signals caused by vibration.

REFERENCES:
patent: 4258292 (1981-03-01), Kassfeldt
patent: 5157382 (1992-10-01), Stopa
patent: 5587629 (1996-12-01), Gornstein
patent: 5672861 (1997-09-01), Fairley et al.

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