IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.
-
Upload
darlene-bruce -
Category
Documents
-
view
216 -
download
0
Transcript of IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.
![Page 1: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/1.jpg)
IEEE’s Hands on Practical Electronics (HOPE)
Lesson #: Inductance
![Page 2: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/2.jpg)
This Week
• Inductors
• Inductance
• Right hand rule
• Faraday’s Law
• Simple circuits
![Page 3: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/3.jpg)
Everyday Use
• DC-DC Converter– Boost converter
• Electromagnets– Motors
– Generators
• Transformers
![Page 4: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/4.jpg)
Other Uses
• Filters
• LNA
• Matching networks
• Impedance boosting (transmission lines)
![Page 5: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/5.jpg)
Inductor
• Variable: L
• Units: Henries (H)
• Symbol:
• Stores energy in the magnetic field
![Page 6: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/6.jpg)
CPU• Filter
• Multiphase power supply converters
AMD Socket 939 processor
![Page 7: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/7.jpg)
Inductance
• How much something opposes a change in current
• 1 Henry = 1 Weber/Ampere– Weber measures magnetic flux
– Ampere measures current
![Page 8: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/8.jpg)
Analogy
• Think of current as water.
• It takes a while to get the wheel turning
• But the wheel will continue to spin if the flow is stopped.
![Page 9: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/9.jpg)
Total Inductance
• Analogous to total resistance
• Parallel
• Series
![Page 10: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/10.jpg)
Right Hand Rule
• Current in direction of thumb
• Magnetic field in direction of fingers
![Page 11: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/11.jpg)
Faraday’s Law of Induction
• E is the electromotive force in volts
• b is the magnetic flux through the circuit in webers
![Page 12: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/12.jpg)
Faraday’s Law
• In other words: – Change of magnetic field through a coil of wire
induces a change in current
![Page 13: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/13.jpg)
DC-DC conterter
• You have 9V batteries
• How do you get a circuit to produce 18 volts?
• Put them in series?
• What if you only have one battery?
• Charge pumps (capacitors)
• Use inductors!
![Page 14: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/14.jpg)
Boost Converter
• Step up converter
![Page 15: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/15.jpg)
Boost Converter
![Page 16: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/16.jpg)
Operation
• Phase I– Charging
• Phase II– Discharging
![Page 17: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/17.jpg)
Prius
• Uses 500V
• Without boost converter– 417 cells to power the motor
• With boost converter– 168 cells to power the motor
• A Prius actually uses only 168 cells and boosts the battery voltage from 202 V to 500 V.
![Page 18: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/18.jpg)
LEDs
• AA batteries 1.5V
• White LEDs need 3.3V
• Use a boost converter
![Page 19: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/19.jpg)
Electromagnets
• Magnetic field generated from current
• No magnetic field if on current
• More controllable than permanent magnets
![Page 20: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/20.jpg)
Electromagnets
• Generate heat when in use
• Strength limited by heat dissipation (before the magnet breaks)
• Pulsing current can generate stronger fields
![Page 21: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/21.jpg)
Uses
• Motors/generators
• Relays (telephone line switching)
• Speakers/microphones (transducers)
• Hard disks
• Particle accelerators (SLAC, bevatron)
• Industrial lifting magnets
![Page 22: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/22.jpg)
Transformer
• Steps up voltage while reducing current– Power lines
• Relies on inductive coupling
• NEEDS AC current!
![Page 23: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/23.jpg)
Lab
![Page 24: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/24.jpg)
Today’s Lab
• Make a simple transformer
• Wind the wire into coils around the same rod
• Measure the voltages to see voltage boosting
• Is the transformation ideal?– Calculate efficiency
• Where is the power loss generated?
![Page 25: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/25.jpg)
Other Uses
• Analog circuitry– Tuning old school radios
![Page 26: IEEE’s Hands on Practical Electronics (HOPE) Lesson #: Inductance.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649dc35503460f94ab5607/html5/thumbnails/26.jpg)
References
• Wikipedia!!!