Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1992-06-19
1997-01-21
Hoff, Marc S.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
307 101, 323288, H02J 100
Patent
active
RE0354287
ABSTRACT:
An electronic reostat circuit having a pulse width modulated output for controlling energization of resistive device [such as a vehicle dashboard illumination lamp]. [A] According to one aspect of the invention 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. According to another aspect of the invention, [The] 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.
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Hoff Marc S.
Nartron Corporation
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