Power Electronics Tutorial
Power Semiconductor Devices
Phase Controlled Converters
DC to DC Converters
Inverters
AC to DC Converters
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- Linear Circuit Elements
- Power Electronics - Switching Devices
- Power Electronics - Introduction
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Power Semiconductor Devices
- Solved Example
- Power Electronics - MOSFET
- Power Electronics - IGBT
- Power Electronics - BJT
- Power Electronics - TRIAC
- Silicon Controlled Rectifier
Phase Controlled Converters
- Solved Example
- Power Electronics - Dual Converters
- Reactive Power Control of Converters
- Performance Parameters
- Effect of Source Inductance
- Power Electronics - Pulse Converters
DC to DC Converters
- DC Converters Solved Example
- Resonant Switching
- Power Electronics - Control Methods
- Power Electronics - Choppers
Inverters
AC to DC Converters
- Solved Example
- Power Electronics - Matrix Converters
- Integral Cycle Control
- Power Electronics - Cycloconverters
- Single Phase AC Voltage Controllers
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Solved Example
Power Semiconductor Devices Solved Ex
A (BJT) emits a current of 1mA, and has emitter efficiency of 0.99. The base transport factor is 0.994 and a depletion layer recombination factor is 0.997. For the BJT calculate the following −
The transport factor
The rewritten transport factor is given by −
$$alpha =gamma _{E} imes alpha _{T} imes delta _{r}$$Substituting the values, we get
$$alpha =0.99 imes 0.994 imes 0.997=0.981$$The current gain
Current gain is given by −
$$eta =frac{I_{C}}{I_{B}}=frac{alpha }{1-alpha }$$Substituting the values, we get
$$eta =frac{0.981}{1-0.981}=51.6$$