CSC(Chang Sung Corp) Powder Cores
Powder cores are distributed air gap cores made from ferrous alloy powders for low losses at high frequencies. Small air gaps distributed evenly throughout the cores increase the amount of DC that can be passed though the winding before core saturation occurs. Molybdenum permalloy powder (MPP) cores are excellent as low loss inductors for switch-mode power supplies, switching regulators and noise filters. High Flux and Sendust powder cores are better choice for the power factor correction (PFC), switching regulator inductors, in-line noise filters, pulse and flyback transformers, and many other application required for low losses at high frequencies.
Powder Core Descriptions
MH&W International offers many types of soft magnetic powder cores of the Molybdenum Permalloy(MPP), High Flux, Sendust and the new Mega Flux core materials, which are mainly used for inductors and transformers requiring the low losses and inductance stability under high DC bias conditions. The fully standardized production under strict quality control from raw materials (nickel, iron, molybdenum, aluminum and silicon) to finished products enables MH&W to reduce the variations in product quality making it possible to maintain a guaranteed level of quality.
| MPP | High Flux | Sendust | Mega Flux | |
|---|---|---|---|---|
| Materials | Ni-Fe-Mo alloy | Ni-Fe alloy | Fe-Si-Al alloy | Fe-Si alloy |
| Color | Yellow | Green | Blue | Dark Brown |
| Finish | Epoxy, Parylene-C, Plastic Case | |||
| Sizes | From 3.5mm OD to 77.8mm OD | |||
| Permeabilities (µ) | 26, 60, 125, 147, 160, 173, 200 |
26, 60, 125, 147,160 | 26, 60, 75, 90, 125 | - |
| Break-Down Voltage | 500V min. | 500V min. | 500V min. | - |
| Magnetic Characteristics |
Relatively high saturation flux density
Low residual flux density
Excellent temperature stability
Low core losses
Excellent inductance stability under high DC bias conditions |
Highest biasing capability
High saturation flux density of 15,000G compared to 7,000G for MPP and 10,000G for Sendust
Relatively low core losses |
Core losses significantly lower than powdered iron
Good DC bias characteristics
Cost between powdered iron and MPP |
Bsat : 1.6 Tesla
High energy storage capacity
Low core losses compared to Fe-Si Laminations
Low relative cost
Block assembly available
Good candidate for high-end applications |
| Major Applications |
Direct current output inductors for SMPS
High Q filters
Loading coils
EMI/RFI filters
Many other precision applications |
Power factor correction(PFC) circuits
Switching regulator inductors
In-line noise filters
Pulse and flyback transformers |
Power factor correction(PFC) circuits
Switching regulator inductors
In-line noise filiters
Pulse and flyback transformers |
Output Chokes
Line filters
PFC reactors
Flyback transformers
Examples:
VRM cores for PC
DC-AC reactor for renewable & alternative energy
DC-AC reactor for industrial & military demands
Boosting coil for (Hybrid) electric vehicles
|
| Material Characteristic Comparisons | ||||||
|---|---|---|---|---|---|---|
| Core Materials |
Core Loss |
Perm. vs DC Bias |
Relative Cost |
Frequency Range |
Flux Density (Sat.) |
Temp. Stability |
| MPP | Lowest | Better | High | 1MHz | 7,000G | Best |
| High Flux | Low | Best | Medium | 1MHz | 15,000G | Better |
| Sendust | Medium | Good | Low | 2MHz | 10,000G | Good |
| Mega Flux | Medium | Best | Low | 1MHz | 10,000G | Best |
| Iron | Highest | Poor | Lowest | 100KHz | 10,000G | poor |
| Amporphous (gapped) | Medium | Better | Highest | 300KHz | 6,500G | poor |
| Ferrite (gapped) | Lowest | Poor | Low | 1MHZ | 4,500G | poor |
| Applications | ||
|---|---|---|
| Computer | Desk top PC | DC Reactor, Choke Coil for SMPS |
| Lap Top PC | DC Reactor, Choke Coil for SMPS | |
| Server PC | DC Reactor, Buck Inductor for SMPS Buck Inductor for VRM | |
| Display | PDP | DC Reactor, Buck Inductor for Pre-regulator |
| LCD TV | Choke Coil for Adapter | |
| Lap Top PC LCD | Choke Coil for LCD Back Light Inverter | |
| PDA | Choke Coil for LCD Back Light Inverter | |
| Mobile Phone | Choke Coil for LCD Back Light Inverter | |
| Home Appliances | Digital Amp(for Home Theater) | Low Pass Filter for Digital Amp |
| Digital Camera/Camcoder | Choke Coil for LCD Back Light Inverter | |
| Inverter Airconditioner | DC Reactor for PFC | |
| Induction Heating | AC Reactor for PFC | |
| Industrial Uses | Elevator | AC Reactor for PFC |
| CNC | AC Reactor for PFC | |
| UPS | DC Reactor for SMPS | |
| Automobile | 42V Power Module | Back-Boost Inverter for DC DC Converter |
| EV, HEA | Back-Boost Inverter for DC DC Converter | |
| Substitutional Energy | Solar Cell Generating System | DC Reactor, AC Reactor for Inverter |
| Fuel Cell Generating System | DC Reactor, AC Reactor for Inverter | |
| Telecommunications | Relay Center of Mobile Devices | DC Reactor for SMPS |
| Mobile Phone | Choke Coil for DC DC Converter | |
| Common Uses | Differential Mode Noise Filter | |
