Electronic rheostat method and apparatus

Details Electronic rheostat method and apparatus Electronic rheostat method and apparatus

1988-08-02

1990-06-19

Miska, Vit W.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307 101, H02J 100

Patent

active

049356410

ABSTRACT:
An electronic reostat circuit having a pulse width modulated output for controlling energization of a device such as a vehicle dashboard illumination lamp. A comparator circuit compares a reference signal adjusted by a user with an alternating signal, preferably a saw tooth waveform, and generates a pulse width modulated output whose duty cycle varies directly with the size of the reference signal. The reference signal is generated by a tapped resistor array wherein contacts on the array are coupled to ground by a rotary switch contact which can be adjusted by the user. By raising and lowering the reference signal, the duty cycle can be changed from a minimum to maximum and thereby produce a minimum and maximum lamp illumination signal.

REFERENCES:
patent: 4093908 (1978-06-01), Evans
patent: 4160945 (1979-07-01), Schorr
patent: 4311956 (1982-01-01), Tolmie, Jr.
patent: 4636711 (1987-01-01), Freymuth
Wagstaff, "Dual Purpose Lights Reminder for Cars Reminds You to Turn Your Lights On Reminds You to Turn Your Lights Off," Practical Electronics, vol. 15, No. 3 (Mar. 1979), pp. 62-64.

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