AC/DC-sensitive Differential Current Sensors (DI-Sensors)

Transcription

1 AC/DC-sensitive Differential Current Sensors (DI-Sensors) Closed loop sensors with magnetic probe for highest accuracy and reliability Differential range typically 30 to 300 ma Full load to 50 A Single +5 V voltage supply Voltage output for direct connection at A/D converters Automatic demagnetization of the sensor core for offset decrease Self-monitoring and test functions Measuring accuracy 1.5% Smallest temperature drift, highest long-term stability Metal screen against external fields Frequency range DC to 10 khz Variants with passing through opening and with integrated primary, with or without test winding Active sensors with integrated electronics Passive sensors for external electronics Economical construction Applications Control devices with AC/DC-sensitive differential sensors are used primarily in transformerless solar inverters. An important safety function of these devices is the monitoring of the leakage of the entire system from photovoltaic - modules and inverter against earth. A defective system can become dangerous for people or release fires. Before it comes so far, the inverter must disconnect from the grid. The leakage contains DC and AC components. Therefore an AC/DC-sensitive monitoring unit is necessary. Their heart is the VAC differential sensor, whose output voltage is evaluated by the control system of the solar inverter. Generally protection devices with AC/DC-sensitive differential sensors can be used everywhere, where flat or pulsating DC can develop, whose amount is permanently greater than zero. Further examples are power supplies producing high DC voltages or uninterruptable power supplies. Variants of the VAC Sensors The following types are available Active types with integrated electronics. The auxiliary functions demagnetiation, error signaling and internal test are accessible over defined levels at the in-/outputs Vout and VRef AC/DC-sensitive Differential Current Sensors (DI-Sensors) Page 1 von 7

2 Passive types for the use with external electronics. The external circuit is built up by the user. It is however contained in the IC DRV401 (VAC article code T60404-Q5790-X800 or - X801) to a large extent. This IC is likewise available with VAC. There are only a few external components necessary. Except the function range of the active types the user has the possibility for the free measuring range choice, he receives a signal when the measuring range is exceeded and he has access to the auxiliary functions as standard logic levels over separate in- and outputs of the IC. For building up breadboard circuits VAC can offer an evaluation board on request. The paper Application Hints for DI-Current Sensors with the IC DRV401 can be downloaded from our website Active as well as passive types are available in each case in three mechanical styles: With opening for primary With two built-in primary for full PCB mounting With two built-in primary plus one test for full PCB mounting Functional description, technical data, available Types Item no. T60404-N4646- T60404-M4645- X950 X960 X970 X150 X160 X170 Style Electronics integrated external, using IC DRV401 Primary style Connections for signals and supply voltage opening connection pins for PCB mounting, one A = 0,8 mm² for external test opening IC DRV 401 in SMD housing: - PQFP-N20, 1/40 pitch, item no. T60404-Q5790-X800 - SOIC20, 1/20 pitch, item no. T60404-Q5790 X801 Properties Supply voltage 5 V Supply typ. 17 ma Maximum primary 50 A Nominal differential 300 ma to be defined by the user Output voltage reference voltage ± (0,74 x differential / 300 ma) to be defined by the user Measuring range ± 850 ma to be defined by the user Output voltage range 0,5 V 4,5 V to be defined by the user Reference voltage 2,5 V reference voltage, internally generated or from external source Frequency range 0 10 khz, limited by internal low pass filter. An additional external filter with e.g. 5 khz roll off to be defined by the user frequency is recommended., one A = 0,8 mm² for external test AC/DC-sensitive Differential Current Sensors (DI-Sensors) Page 2 von 7

3 Item no. T60404-N4646- T60404-M4645- X950 X960 X970 X150 X160 X170 Measuring error at Tamb = 25 C < 1,5 % of nominal differential Temperature drift C < 0,1 mv/ C Response time (up to 90% of nominal differential ) < 35 µs Isolation strength acc. to EN50178 (primary- and test vs. signal and supply voltage connections) to be maintained by a proper insulation of the primary to be maintained by a proper insulation of the primary - system voltage 600 V 300 V 600 V 300 V - working voltage V 800 V V 800 V Additional functions Error condition - indicated by output voltage < 0,5 V log. 0 at IC - output ERROR - critieria break or short circuit of the magnetic probe, supply voltage smaller 4 Volts, during the demagnetization cycle. Demagnetization of the Sensor core - triggered by - feeding the supply voltage log. 1 at IC input DEMAG - transition from <1 V to 2,5 V (normal voltage) at the reference voltage input, i.e. after test cycle - duration of cycle 120 ms Internal DC test currrent for self test - triggered by setting reference voltage to 0 V (<1 V) to be realized by additional circuitry - output signal at test U DC = +0,25 V at Vref = 0 V. A possibly appearing primary is superimposed - Measuring range exceeding - indicated by - log. 0 at IC -output OVER-RANGE AC/DC-sensitive Differential Current Sensors (DI-Sensors) Page 3 von 7

4 Dimensional Diagrams Diagram No. 1 Types T60404-N4646-X950 T60404-M4645-X150 7,0 41,75±0,25 2x2,54 27,94 I P Toleranz der Stiftabstände ±0,2mm (Tolerances grid distance) Marking: Excerpt from. Item no. F DC Connections: 1 4: 0,7 x 0,6 mm 6-X950 1 Vc +5 V 2 GND 3 Vref In/Out 4 Vout 25,8 3,5-0,5 7,7 0,5 F DC 1 12, ,8 5-X150 1, 2 Magnetic probe 3, 4 Compensationcoil 41,35±0,25 0,7x0,6 19,2 AC/DC-sensitive Differential Current Sensors (DI-Sensors) Page 4 von 7

5 Maßbild Nr. 2 Typ T60404-N4646-X960 T60404-M4645-X Ø2, , ,6x0,7 17,94 Beschriftung (marking) 2x2, F DC 0,5 27,94 26,9 3,5±0,5 Toleranz der Stiftabstände ±0,2mm (Tolerances grid distance) Marking: Excerpt from Item no. F DC Connections: 1 4: Ø 2,8 mm 5 8: 0,7 x 0,6 mm 6-X : Prim. 5 Vout 6 Vref 7 GND 8 Vc +5 V 5-X : Prim. 7, 8 Magnetic probe 5, 6 Compensationcoil AC/DC-sensitive Differential Current Sensors (DI-Sensors) Page 5 von 7

6 Maßbild Nr. 3 Typ T60404-N4646-X970 T60404-M4645-X ,64 25, ,94 10 Beschriftung (marking) 2x2, F DC 0,5 27,94 26,9 3,5±0,5 Toleranz der Stiftabstände ±0,2mm (Tolerances grid distance) Beschriftung: Excerpt from Item no. F DC Connections: 1 4: Ø 2,8 mm 9, 10: Ø 1,0 mm 5 8: 0,7 x 0,6 mm 6-X : I Prim. 9, 10: Test 5 Vout 6 Vref 7 GND 8 Vc +5 V 5-X : Prim. 9, 10: Test 7, 8 Magnetic probe 5, 6 Compensationcoil AC/DC-sensitive Differential Current Sensors (DI-Sensors) Page 6 von 7

7 VACUUMSCHMELZE GMBH & CO. KG GRÜNER WEG 37 D HANAU PHONE FACSIMILE INFO@VACUUMSCHMELZE.COM VAC SALES USA LLC 2935 DOLPHIN DRIVE SUITE ELIZABETHTOWN KY / USA PHONE FACSIMILE INFO-USA@VACUUMSCHMELZE.COM VACUUMSCHMELZE SALES OFFICE SINGAPORE 61 KAKI BUKIT AVENUE 1 #04-16 SHUN LI INDUSTRIAL PARK SINGAPORE TELEFON FAX VACSINGAPORE@VACUUMSCHMELZE.COM VACUUMSCHMELZE GmbH & Co. KG ADVANCED MATERIALS THE KEY TO PROGRESS Published by VACUUMSCHMELZE GmbH & Co. KG, Hanau VACUUMSCHMELZE All rights reserved. As far as patents or other rights of third parties are concerned, liability is only assumed for products per se, not for applications, processes and circuits implemented within these products. The information describes the type of product and shall not be considered as assured characteristics. Terms of delivery and rights to change design reserved. AC/DC-sensitive Differential Current Sensors (DI-Sensors) Page 7 von 7