Toroid Inductors style common mode chokes are designed to provide the highest common mode impedance over the widest frequency range. These parts are ideal for any application requiring a high DC current bias and are well suited for use in switch-mode power supplies. Common mode chokes are most effective in filtering supply and return conductors with in-phase signals of equal amplitude. Differential mode inductors are available for filtering out-of-phase or uneven amplitude signals. A Toroidal inductor is an inductor that is designed on a doughnut shaped core. Toroidal inductors offer small size, less leakage inductance and lower electromagnetic interference (EMI).
- No load inductance in uH
- Full load inductance in uH
- DC Current in Amperes
- AC Current in Amperes peak to peak
- Operating frequency is needed for core calculations and wire sizing
- Core material is selected for the known operating frequency or frequencies
- Other Toroidal inductor design considerations are space limitations and mounting technique
- Lead terminations are also specified through the design of a Toroidal inductor
Pulse Transformer :
A pulse transformer is a transformer that is optimized for transmitting rectangular electrical pulses--that is, pulses with fast rise and fall times and a relatively constant amplitude.
- 8 Operating Principles
- Magnetizing (No-Load) Current
- Voltage Drop
- Voltage-Time Product
- Kickback Voltage
- Secondary Load Current
- Effects of Winding Capacitance
- The Trailing Edge
- Pulse Distortion
The magnetic flux in a typical A.C. transformer core alternates between positive and negative values. The magnetic flux in the typical pulse transformer does not. The typical pulse transformer operates in an “unipolar” mode (flux density may meet but does not cross zero.)
Pulse transformer designs vary widely in terms of power rating, inductance, voltage level (low to high), operating frequency, size, impedance, bandwidth (frequency response), winding capacitance, and other parameters. Designers try to minimize parasitic elements such as leakage inductance and winding capacitance by using winding configurations which optimize the coupling between the windings.