Technologies & Products Press Conference LeaXield Active filter for leakage current minimization

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1 Technologies & Products Press Conference 2014 LeaXield Active filter for leakage current minimization Andrew Tucker Automotive & Power Conversion Solutions Magnetics Business Group November 12, 2014

2 Leakage currents a hidden and ignored risk High earth leakage currents are typical for power drive installations High voltages can occur on machinery and equipment with a safety risk to humans RCDs can be tripped resulting in frequent system shut-downs It is dangerous and costly to ignore earth leakage currents! CC 11/14 2

3 Leakage current can trip RCDs Main 3 RCD EMC filter Power drive system Long motor cable ( 200 m) M I leak I leak from EMC filter Parasitic I leak from frequency converter Parasitic I leak from motor cable I leak from motor Current approaches Larger passive filter solutions RCDs that trip at higher currents Drawbacks Overdimensioned and costly Less safe Needed: Compact and cost-effective way to counteract leakage current! CC 11/14 3

4 Introducing LeaXield The LeaXield add-on module is an active filter that minimizes inverter-induced leakage current LeaXield integrates Amplifier Current transformer Power supply unit The LeaXield add-on module minimizes leakage currents that cause RCD tripping and improves the EMC performance of existing line filters. CC 11/14 4

5 Functional principle of LeaXield Main 3 RCD LeaXield EMC filter Power drive system Long motor cable ( 200 m) M I leak from EMC filter Parasitic I leak from frequency converter Parasitic I leak from motor cable I leak from motor LeaXield effectively minimizes the inverterinduced leakage current on the line side and prevents the RCD from tripping. LINE L1 L2 L3 PSU Core Amplifier Current Transformer LOAD L1 L2 L3 PE 0 E CC 11/14 5

6 Effective reduction of leakage currents Without LeaXield With LeaXield RCD limit RCD limit Leakage current [ma] Leakage current [ma] Frequency [khz] Frequency [khz] Thanks to LeaXield, leakage current peaks remain below the RCD tripping threshold. CC 11/14 6

7 Effective reduction of leakage currents Waveform without LeaXield Waveform with LeaXield Leakage current [ma] Leakage current [ma] Time [ms] Time [ms] LeaXield helps ensure safe operation of drive systems with high currents. CC 11/14 7

8 LeaXield improves EMC filtering performance Waveform without LeaXield Waveform with LeaXield Attenuation [db µv] QP Attenuation [db µv] QP 50 AV 50 AV khz MHz 150 khz MHz Frequency Frequency LeaXield provides active cancellation of common-mode currents induced by the inverter s switching frequency mainly in the range of 1 khz up to approx. 500 khz. CC 11/14 8

9 Application areas of LeaXield Samples available Minimize leakage current for power drive systems with RCD tripping problems Improve EMC filter performance in power drive systems extended with additional motors Downsize existing EMC filters by enabling the use of significantly smaller EMC filter chokes Key data Voltage range [V AC] 360 to 520 Power frequency [Hz] 50/60 Max. power current [A] 150 Max. common-mode current [ma] 1000 Dimensions [mm] 258 x 80 x 100 CC 11/14 9

10 Benefits of LeaXield in existing power drive applications Versatile Can be used with both standard and regenerative drives Effective Minimizes leakage current thus avoiding RCD tripping Safe Supports safe operation of industrial electronics installations Added benefit Improves the EMC performance of the system Superior solution More cost-effective and space-saving than passive solutions with much larger chokes, especially in high current applications Easy to mount Requires no additional power supply CC 11/14 10

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