WO1994004931A1 - Pegelmessgerät - Google Patents

Pegelmessgerät Download PDF

Info

Publication number
WO1994004931A1
WO1994004931A1 PCT/DE1993/000723 DE9300723W WO9404931A1 WO 1994004931 A1 WO1994004931 A1 WO 1994004931A1 DE 9300723 W DE9300723 W DE 9300723W WO 9404931 A1 WO9404931 A1 WO 9404931A1
Authority
WO
WIPO (PCT)
Prior art keywords
positive
measurement
reference potential
voltage
negative
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE1993/000723
Other languages
German (de)
English (en)
French (fr)
Inventor
Klaus Hoffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to US08/381,970 priority Critical patent/US5541502A/en
Priority to DE59302624T priority patent/DE59302624D1/de
Priority to JP50575994A priority patent/JP3239185B2/ja
Priority to EP93917547A priority patent/EP0655137B1/de
Publication of WO1994004931A1 publication Critical patent/WO1994004931A1/de
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of AC into DC

Definitions

  • the invention relates to a level measuring device for dc NF signals.
  • the measuring time for automatic level measurement is essentially determined by the lower cut-off frequency of the measuring rectifier.
  • Coupling capacitors are generally used for coupling the level measuring device to low-voltage NF signals. These have a disruptive effect on the measuring time, since recharging processes take place in the coupling capacitors, caused by switching peaks, overrides etc.
  • German patent 38 316 678 discloses a circuit arrangement for measuring the peak value of a time-varying signal superimposed on a DC voltage pulse, in which the DC voltage component is eliminated by inversion and addition of the inverted and non-inverted signals.
  • the invention is based on the object of specifying a low-cost level measuring device in which the coupling capacitors can be avoided.
  • the level measuring device according to the invention can also be used in three direct voltages.
  • a source 1 which can be, for example, a power amplifier.
  • the source 1 sends an LF measurement signal to a measuring rectifier 2 and to a low-pass filter 7.
  • the measuring rectifier 2 has two diodes D1 and D2, the cathode of the diode Dl being connected to the anode of the diode D2, and two resistors Rl and R2 and two capacitors Cl and C2.
  • the measurement signal is present at the connection between the two diodes D1 and D2.
  • a positive DC voltage + I is formed from the measurement signal via the diode D1 polarized in the direction of flow and a negative DC voltage -I is formed via the diode D2 polarized against the direction of flow.
  • the cathode of the diode Dl is connected to a reference point 6 via a parallel circuit comprising the resistor R1 and the capacitor C1.
  • the anode of the diode D2 is also connected to the reference point 6 via a parallel circuit comprising the resistor R2 and the capacitor C2.
  • the positive and the negative DC voltage + U M , -U M are each related to the potential of the reference point 6.
  • the reference point 6 is connected to the output of the low-pass filter 7, at the input of which the measurement signal is present.
  • the low-pass filter 7 can be an active low-pass filter or also a passive low-pass filter with an impedance converter connected downstream.
  • the measurement signal emitted by source 1 contains an LF AC voltage and this is superimposed on a positive or negative DC voltage. This DC voltage can also drift over time.
  • the low voltage 7 filters the DC voltage out of the measurement signal and serves the rectifiers (diodes D1, D2) of the measurement rectifier 2 as a reference point 6 with a reference potential IL.
  • the subtractor 5 forms the difference between the two signals present:
  • the subtractor 5 outputs this result (2U M ) as the level measurement value of the measurement signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
PCT/DE1993/000723 1992-08-17 1993-08-09 Pegelmessgerät Ceased WO1994004931A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US08/381,970 US5541502A (en) 1992-08-17 1993-08-09 Level measuring set for low-frequency signals
DE59302624T DE59302624D1 (de) 1992-08-17 1993-08-09 Pegelmessgerät
JP50575994A JP3239185B2 (ja) 1992-08-17 1993-08-09 レベル測定装置
EP93917547A EP0655137B1 (de) 1992-08-17 1993-08-09 Pegelmessgerät

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4227166A DE4227166C1 (enExample) 1992-08-17 1992-08-17
DEP4227166.5 1992-08-17

Publications (1)

Publication Number Publication Date
WO1994004931A1 true WO1994004931A1 (de) 1994-03-03

Family

ID=6465713

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1993/000723 Ceased WO1994004931A1 (de) 1992-08-17 1993-08-09 Pegelmessgerät

Country Status (5)

Country Link
US (1) US5541502A (enExample)
EP (1) EP0655137B1 (enExample)
JP (1) JP3239185B2 (enExample)
DE (2) DE4227166C1 (enExample)
WO (1) WO1994004931A1 (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19643822A1 (de) * 1996-10-30 1998-05-07 Alsthom Cge Alcatel Schaltungsanordnung zur Erzeugung einer Gleichspannung
US7535262B2 (en) * 2004-10-19 2009-05-19 International Rectifier Corporation High voltage level shifting by capacitive coupling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1791225B1 (de) * 1967-01-20 1971-08-05 Sentralinst For Ind Forskning Anordnung zur messung einer wechselspannung
US4030016A (en) * 1976-03-26 1977-06-14 Hewlett-Packard Company Precision active rectifier circuit
DE3831678A1 (de) * 1988-09-17 1990-03-22 Telefunken Electronic Gmbh Schaltungsanordnung zur spitzenwertmessung
DE3924049C1 (en) * 1989-07-21 1991-01-17 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De High pass filter separating out wideband AC voltage - has capacitor and earthed resistor as filter unit coupled to diode circuit via amplifier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225213A (en) * 1962-05-18 1965-12-21 Beckman Instruments Inc Transition detector
US3794915A (en) * 1971-07-23 1974-02-26 Gen Electric Circuitry for detecting low amplitude rapid variations in a high amplitude output signal
US4187537A (en) * 1978-12-21 1980-02-05 Zenith Radio Corporation Full-wave rectifier
NL8303855A (nl) * 1983-11-10 1985-06-03 Philips Nv Frequentieverdubbelschakeling.
JPH01265718A (ja) * 1988-04-18 1989-10-23 Toshiba Corp シュミットトリガ回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1791225B1 (de) * 1967-01-20 1971-08-05 Sentralinst For Ind Forskning Anordnung zur messung einer wechselspannung
US4030016A (en) * 1976-03-26 1977-06-14 Hewlett-Packard Company Precision active rectifier circuit
DE3831678A1 (de) * 1988-09-17 1990-03-22 Telefunken Electronic Gmbh Schaltungsanordnung zur spitzenwertmessung
DE3924049C1 (en) * 1989-07-21 1991-01-17 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De High pass filter separating out wideband AC voltage - has capacitor and earthed resistor as filter unit coupled to diode circuit via amplifier

Also Published As

Publication number Publication date
US5541502A (en) 1996-07-30
JPH08500182A (ja) 1996-01-09
DE4227166C1 (enExample) 1993-04-29
DE59302624D1 (de) 1996-06-20
EP0655137B1 (de) 1996-05-15
EP0655137A1 (de) 1995-05-31
JP3239185B2 (ja) 2001-12-17

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