Solid-state potentiometer for coupling circuits having...

Details Solid-state potentiometer for coupling circuits having... Solid-state potentiometer for coupling circuits having...

H - Electricity

03

K

354/75, 328/114.

H03K 7/08 (2006.01) H03G 1/00 (2006.01)

Patent

CA 1039411

ABSTRACT OF THE INVENTION An electronic circuit including a pulse-width modulator coupled to an oscillator and responsive to a variable amplitude d.c. voltage signal which is representative of shaft displacement on a potentiometer. The output signal produced by the modulator has a variable pulse width proportional to the amplitude of the applied d.c. voltage signal. A light emitting diode response to the modulated pulse width signal produces pulses of light energy having variable durations proportional to the variable pulse width of the modulated signal. A photo detector diode responsive to the pulses of light energy produces an isolated signal identical in pulse width to the signal driving the light emitting diode and is coupled to a chopper circuit. The oscillator is also coupled to an isolated power supply which functions as a source of isolated d.c. potential for an input transistor in the chopper circuit. A second isolated power supply (supplied by user) provides a refer- ence voltage, comparable to the reference voltage across the wind- ing of a potentiometer, to the output stage of the chopper which produces a variable duty cycle output voltage. A low pass filter in series with an operational amplifier and an emitter follower are coupled to the output stage of the chopper circuit to provide a variable output impedance form the emitter follower which closely approximates the operation of a potentiometer while the output signal from the emitter follower has an amplitude proportional to the product of the reference voltage and the variable d.c. signal representative of shaft displacement on a potentiometer applied to the pulse width modulator.

214695

Affiliated with

Also associated with

Rating

Solid-state potentiometer for coupling circuits having... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solid-state potentiometer for coupling circuits having..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid-state potentiometer for coupling circuits having... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-627108