Optically isolated current source

Author:

Pettersen F. J.12,Høgetveit J. O.12

Affiliation:

1. Oslo University Hospital HF, Department of Clinical and Biomedical Engineering , Oslo , Norway

2. University of Oslo, Department of Physics , Oslo , Norway

Abstract

Abstract There is a need for isolated current sources for use in selected bioimpedance measurement circuits. The requirement for good isolation is particularly important in medical settings because of safety concerns. A new circuit for producing voltage-controlled current is presented. Measurements have been made on a prototype and simulations have been done on a SPICE model. The presented circuit is an H-bridge where the output devices are the output photodiodes of high-linearity optocouplers. Five operational amplifiers, four high linearity optocouplers, and passive components are used. Output current capability is ±35 μA with an output impedance that is more than 1 M Ω. It is possible to achieve bandwidths above 1 MHz for small load impedances. This circuit is well suited for medical applications thanks to the isolation in the optocouplers.

Publisher

Walter de Gruyter GmbH

Subject

Biomedical Engineering,Biophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Application of Optocoupler Isolation in Rotation Speed Measuring Circuit of Maglev Blower;Lecture Notes in Electrical Engineering;2023

2. Multi-Frequency Current Source for Varying Loads in Electrical Impedance Tomography Systems;Advances in Automation, Signal Processing, Instrumentation, and Control;2021

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