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Noise Suppression Devices

Noise Suppression Devices
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2. Noise Suppression Devices An amorphous noise suppression device is unique and completely different from conventional noise filters. Conventional noise prevention products focus on somehow minimizing the noise after it's been created, by typically trying to absorb the noise, and so their effectiveness in noise reduction is directly influenced by frequency of the circuit. Amorphous noise suppressing devices, on the other hand, focus on the source of the noise and work to prevent or minimize the noise before it has a chance to develop. The source of the electronic circuit noise is the rapid change of current or voltage, and the effectiveness of the amorphous cores in eliminating this noise is independent of frequency. An amorphous noise suppression device is a product that takes full advantage of the unique magnetic characteristics of the cobalt based amorphous alloy. Toshiba Materials offers two noise suppression devices, "AMOBEADS®" and "SPIKE KILLERS®". AMOBEADS®" deliver excellent noise suppression results and are convenient to use by simply being slipped over the leads of the semiconductor device. "AMOBEADS®" are also available with a lead thru and in a surface mount configuration. "SPIKE KILLERS®", which are larger in size than "AMOBEADS®", most often are wire wound and are effective in eliminating or minimizing higher noise levels. Noise Suppression Device RC Snubber Magnetic Snubber Basic Snubber Circuit Diagram Noise Suppression Devices Example for Noise Suppressing Effect (Chopper Converter) With an excellent saturable characteristic, "AMOBEADS ® suppress the reverse recovery current of the diode and decrease the noise that was occurring. When the current for diode reverses and tries to go into the recovery condition, the "AMOBEADS®" displays a large inductance and oppose the generation of the recovery current. In this instance, a soft recovery is possible for core material with a smaller coercive force. Output Noise Diode Currant Without Countermeasure With AMOBEADS®

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AB/LB/SS Series Standard Specifications * 1 Reference Value *2 Minimum Guarantee on Measuring Condition : 50kHz, 80A/m(sine wave). R.T. *3 Measuring Condition : 50kHz. IV. ltum, R.T. *4 Typical Value, using a cross section of leed *5 Measuring Condition : 100kHz. 80A/m (sine wave), R.T. *6 Tolerance ±0.2 [mm] -fr" AMOBEADS® ° sample kits are prepared. Please ask to sales department. ^"AMOBEADS®" and 'SPIKE KILLER ® ": Registered trademarks of TOSHIBA MATERIALS Co.. Ltd. -fr" AMOBEADS®" and "SPIKE KILLER ® ': Resistered in U.S.A.. France. Germany. U.K. Japan.

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Application of Amorphous Noise Suppression Devices Chopper Converter Control Circuit for Motor Flyback Converter Forward Converter Push-pull Converter Characteristics (Typical value) Typical value Sine Wave Coreloss Characteristic [AMOBEADS ] Motor Driving Circuit Typical Valus Frequency Characteristics of Inductance Flux(0) Decline Ratio vs. Temperature

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Spike Voltage Suppression Without Countermeasure duced and ringing phenom- Schottty barrier diode (SBD) can be protected from over withstand voltage. Output Voltage - Current Diode Voltage Diode Current Output Noise Reduction RC Snubber +Ferrite Beads When the ferrtte replaced to forward converter circuit the output noise can be tremen- dously reduced, not only noise peak level but also am- plitude range. Output Voltage - Current Output Noise Primary Surge Voltage When the ferrtte replaced to output diode (SBD) of ttie for- ward converter circuit, the output noise and harmful influ- ence to...

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