Level conversion of AC or DC voltage with noise rejection and low power consumption
AssigneeOtis Elevator Company
InventorsHelmut L. Schroder-Brumloop, Andreas O. F. Belkner
Life of this patent
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Abstract
An input voltage U.sub.IN to a voltage level converter 10 having a high input impedance charges a storage element which periodically discharges current to an LED 16 which periodically provides a light pulse for generating a level converted version of the input voltage U.sub.IN. A resistor R.sub.p 22 connected to the storage element allows the storage element to discharge noise voltage spikes in the input voltage U.sub.IN.
Claims8
A voltage level converter circuit for converting input signals having one voltage level into output signals having another voltage level, said voltage level converter circuit comprising an optical coupler having a primary circuit electrically isolated from a secondary circuit:
- A) said primary circuit including
- an oscillating circuit, responsive to said input signals having an input voltage waveform and said one voltage level, for providing pulsed input voltage signals, and
- a light emitting means, responsive to said pulsed input voltage signals, for providing pulsed light signals;
- and
- B) said secondary circuit including means, responsive to said pulsed light signals, for providing said output signals having an output voltage waveform substantially similar to the input voltage waveform,
- whereby the voltage level converter circuit has a pulsed operation for consuming a reduced amount of power during voltage level conversion.
Dependencies are inferred from the claim text.