SIOV Metal Oxide Varistors - DEMAR

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Application and Design Examples FRAME4/home/SMC-Archiv-DB/GG-KB-engl/DB-SIOV_97_BNR-B462-P6214-X-X-7600/R-Beispiele 30a 30b 30c Figure 30a – c with without Voltage (b), current and energy absorption (c) on SIOV-S20K14AUTO with test pulse 5 (a), load dump generator as in figure 29 b Test pulse 5 acc. ISO 7637-1 (DIN 40 839) Example: C 0 37,6 mF R 0 4,6 Ω C 1 47 µF V S 146 V V DC 14 V R i 2 Ω t d 400 ms t r 0,1 ms 66 Siemens Matsushita Components
Application and Design Examples FRAME4/home/SMC-Archiv-DB/GG-KB-engl/DB-SIOV_97_BNR-B462-P6214-X-X-7600/R-Beispiele 3.3.5 RFI suppression The capacitance of varistors alone (some nF) is not enough for RFI suppression. Therefore S+M has developed the high-capacitive varistors SHCV (Siemens Matsushita HiCap Varistors) that offer transient protection and RFI suppression in very compact form. These components are comprised of a multilayer varistor connected in parallel with a multilayer capacitor. SHCVs are especially suitable for handling RFI from small motors of windscreen wipers, power windows, memory seats, central locking, etc. Figure 31 shows an example of the suppression effect. LW Figure 31 Example of RFI suppression in small motors with chokes and SHCVs (measured to VDE 0879, part 3) 3.4 Telecom MW SW FM For an insulated motor case this capacitor can be replaced by a short-circuiting link without suppression 2 × 8 µH + SHCV (0,47 µF) 2 × 8 µH + SHCV (1,50 µF) Suppression level 5 3.4.1 Requirements Electromagnetic interference on telecommunications, signal and control lines can be quite considerable as these lines tend to be long and exposed. So the requirements are correspondingly high when it comes to the electromagnetic compatibility of connected components or equipment. According to the directives of the Deutsche Telekom, the interference or noise immunity of equipment is tested by application of a surge voltage with a wave form according to CCITT and IEC 1000-4-5. Figure 32 shows a simplified circuit diagram. The test is made with five pulses of either polarity, at least 60 s apart. According to equation 12, a voltage of 2 kV produces a surge current amplitude of approx. 45 A. SIOV varistors are capable of handling this surge current (and of absorbing the accompanying energy). Siemens Matsushita Components 67
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SIOV Metal Oxide Varistors
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Type Survey SMD varistors Standard
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Type Survey Disk varistors Standard
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SIOV Metal Oxide Varistors - DEMAR

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