Category: Power Electronics

In this topic, you study the comparison of Power devices like BJT and IGBT.

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Parameters	BJT	IGBT
Carriers type	Bipolar device	Bipolar device
Gate or base drive	Current controlled	Voltage Controlled
Temperature coefficient of ON-state resistance	Negative	Positive
Applications	Inverters, Choppers, UPS, SMPS, induction motor drives.	Inverters, UPS, SMPS, AC motor drives.
Switching Power loss	High	Low
Input impedance	High	Low
On state voltage drop and Conduction loss	Low	Low
Parallel operation	Not possible	Possible
Voltage and Current Rating	1200 V and 800 A	1200 V and 500 A
Switching Frequency Rating	(10 – 20) kHz	upto 50 kHz

In this topic, you study the comparison of Power devices like BJT, MOSFET, and IGBT.

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Parameters	BJT	MOSFET	IGBT
Carriers type	Bipolar device	Majority carrier device	Bipolar device
Gate or base drive	Current controlled	Voltage Controlled	Voltage Controlled
Temperature coefficient of ON-state resistance	Negative	Positive	Positive
Applications	Inverters, Choppers, UPS, SMPS, induction motor drives.	Choppers, low power UPS, SMPS, brushless DC motor drives.	Inverters, UPS, SMPS, AC motor drives.
Switching Power loss	High	Low	Low
Input impedance	High	Low	Low
On state voltage drop and Conduction loss	Low	High	Low
Parallel operation	Not possible	Possible	Possible
Voltage and Current Rating	1200 V and 800 A	500 V and 140 A	1200 V and 500 A
Switching Frequency Rating	(10 – 20) kHz	upto 1 MHz	upto 50 kHz

In this topic, you study the Principle of Step Down Chopper and its associated circuit diagram, Waveforms, Modes of operation, & theory.

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The buck converter produces a lower average output voltage than the dc source input voltage.

Continue reading Principle of Step Down Chopper (Buck Converter)

In this topic, you study Second Quadrant Chopper or Type B Chopper or Class B Chopper v-i plane, working principle, quadrant operation, Applications, waveforms, and Circuit diagrams. 

Type B chopper is basically equivalent to Step-Up Chopper.

Continue reading Second Quadrant Chopper or Type B Chopper or Class B Chopper

In this topic, you study First Quadrant Chopper or Type A Chopper or Class A Chopper v-i plane, working principle, quadrant operation, Applications, and Circuit diagrams. 

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Type A chopper is basically a Step-Down Chopper.

Continue reading First Quadrant Chopper or Type A Chopper or Class A Chopper

In this topic, you study Four Quadrant Chopper or Type-E Chopper or Class E Chopper v-i plane, working principle, quadrant operation, and Circuit diagrams. 

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Type E chopper is a four-quadrant chopper.

Continue reading Four Quadrant Chopper or Type E Chopper or Class E Chopper

In this topic, you study How to derive an expression for Peak to Peak ripple current for Buck-Boost Regulator.

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The buck-boost regulator can produce an average output voltage less than or greater than the dc source input voltage. Let us assume large filter capacitance C connected across the load so that output voltage remains almost constant. The Resistive load is considered.

Continue reading Buck Boost Regulator Peak to Peak Ripple Current of Inductor Expression Derivation

In this topic, you study the Buck-Boost Regulator Circuit diagram, Waveforms, Modes of operation & theory.

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The buck-boost regulator can produce an average output voltage less than or greater than the dc source input voltage. Let us assume large filter capacitance C connected across the load so that output voltage remains almost constant. The Resistive load is considered.

Continue reading Buck Boost Regulator Circuit diagram, Waveform, Modes of Operation & Theory

In this topic, you study How to derive an expression for Peak to Peak Ripple voltage of the capacitor for Buck-Boost Regulator.

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The buck-boost regulator can produce an average output voltage less than or greater than the dc source input voltage. Let us assume large filter capacitance C connected across the load so that output voltage remains almost constant. The Resistive load is considered.

Continue reading Buck Boost Regulator Peak to Peak Ripple Voltage of Capacitor Expression Derivation

In this topic, you study How to derive an expression of Average Output voltage and Duty Cycle for Buck-Boost Regulator.

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The buck-boost regulator can produce an average output voltage less than or greater than the dc source input voltage. Let us assume large filter capacitance C connected across the load so that output voltage remains almost constant. The Resistive load is considered.

Continue reading Buck Boost Regulator Average Output Voltage Expression Derivation and Duty Cycle