RESISTANCE MEASURING CIRCUIT FOR SENSOR WITH GALVANIC ISOLATION Russian patent published in 2009 - IPC H02H7/08 G01K7/16 

Abstract RU 2350003 C2

FIELD: electricity.

SUBSTANCE: invention is based on the electronic circuit where sensor conductors located inside the measured item are coupled with the amplifier of feedback coupling. The above amplifier reduces DC voltage supplied to the potential divider when sensor resistance is increased. The measured signal is intensified and compared with the output voltage of saw-tooth voltage generator by means of comparator. After that, the sustained pulse-modulated signal is generated and transmitted in digital form to the electronic circuit SELV (safe low-volt voltage), for example, via optoisolator. After amplification, the logarithmical form of signal representation enables precise measuring of the difference between short circuit in the sensor circuit and low values of resistances.

EFFECT: improved reliability and measuring accuracy.

6 cl, 5 dwg

Similar patents RU2350003C2

Title Year Author Number
MULTICHANNEL AMPLIFIER OF D CLASS 2014
  • Aleksandrov Vladimir Aleksandrovich
  • Kazakov Jurij Vital'Evich
  • Kalashnikov Sergej Aleksandrovich
RU2574813C1
OVERVOLTAGE PROTECTION AND GROUNDING DEVICE 2005
  • Laakso Kari-Matti
  • Berts Andreas
  • Kujvalajnen Janne
RU2383096C2
METHOD FOR REGULATING NOMINAL LOAD CURRENT AND DEVICE FOR REALIZATION OF SAID METHOD 2002
  • Zemlevskij V.N.
  • Nazarov Ju.M.
  • Zemlevskij O.V.
RU2235352C2
ILLUMINATION DEVICE FOR ENDOSCOPY FACILITIES 1994
  • Sosnov D.L.
RU2082309C1
LIGHTING DEVICE FOR ENDOSCOPIC EQUIPMENT 2000
  • Sosnov D.L.
  • Chubarov V.P.
RU2161901C1
ADJUSTABLE CURRENT SOURCE 0
  • Krotenko Vladimir Vladimirovich
  • Piskarev Aleksandr Nikolaevich
  • Sinitsyn Vyacheslav Alekseevich
  • Tolmachev Valerij Aleksandrovich
SU1534677A1
LOW FREQUENCY KEY AMPLIFICATION CHANNEL 2023
  • Aleksandrov Vladimir Aleksandrovich
  • Kazakov Yurij Vitalevich
  • Buyanov Andrej Pavlovich
RU2816509C1
CONVERTER CONTROL DEVICE 0
  • Selivanov Aleksej Ivanovich
  • Lipin Gennadij Vasilevich
SU767934A1
CLASS H AMPLIFIER 2021
  • Aleksandrov Vladimir Aleksandrovich
  • Kalashnikov Sergej Aleksandrovich
  • Markova Lyudmila Vasilevna
RU2776830C1
SWITCH STABILIZER 1991
  • Aleksandrov Vladimir Aleksandrovich
RU2011275C1

RU 2 350 003 C2

Authors

Laakso Kari-Matti

Berts Andreas

Dates

2009-03-20Published

2005-06-08Filed