ABSTRACT in open loop Circuit diagram of class


Class E amplifier is prepared for induction heating due to low switching
loss, reduced stress and EMI. This paper deals with modelling, simulation and
implementation of closed loop controlled class E amplifier system. Open loop
and closed loop results are presented to show the improvement with closed loop
control. The hardware fabricated, tested and the results are added to prove the
validity. The results indicate that the output voltage can be regulated using
PI controller.

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Amplifier, Induction Heating, Class-E amplifier, EMI.



Improving efficiency is a major
criterion when working with power amplifiers along with its stability. Class D,
Class E power amplifiers are the most used amplifier systems for Induction
heating application. Lot of research focused in these power amplifiers in the designing
of high power Induction heating (IH) systems everywhere.












Class-E amplifier system in open loop

Circuit diagram of class E amplifier in open loop system is shown in
Fig 2.1. The input voltage in open loop is shown in Fig 2.2 and the output
voltage of rectifier is shown in Fig 2.3. The value of rectifier output voltage
is 41V. The output voltage of class E amplifier is shown in Fig 2.4.

Fig 2.1.Circuit diagram of Class-E amplifier open
loop system.


Fig 2.2 input voltage in of Class E amplifier open
loop system.


Fig 2.3 Output voltage of Rectifier.

Fig 2.4 Output voltage of Class E amplifier system.




III. Closed loop class E
amplifier system

Closed loop PI controlled system is shown in Fig 3.1. The output of
rectifier in closed loop is shown in Fig 3.2. The RMS value of output voltage
is shown in Fig 3.3 and its value is 39V RMS. The output voltage of class E
amplifier is shown in Fig 3.4.

Fig 3.1
Closed loop PI controlled class-E amplifier system.



Fig 3.2 Output voltage of
rectifier in closed loop system.



Fig 3.3. RMS value of output voltage.


Fig 3.4 Output voltage of class E amplifier.



The hardware is fabricated and tested in the laboratory. The hardware snap
shot is shown in Fig 4.1. Triggering pulses for M1 & M2 are shown in Fig
4.2. Voltage across the switch is shown in Fig 4.3. Output voltage of class E
amplifier is shown in Fig 4.4.

Fig 4.1 Hardware snapshot of class E amplifier


Fig 4.2 Triggering pulses
for M1 and M2.



Fig 4.3 Voltage across Switch-1


Fig 4.4 Output voltage of
class E amplifier.


Closed loop controlled class E
amplifier system is designed, modeled and simulated using simulink and the
results are presented. The hardware is engineered and tested. The hardware
results match with the simulation results. The proposed system has advantages
like low steady state error in voltage and quick settling time. The drawback of
class E amplifier system is that it requires two controlled switches and two
inductors.    The scope of the present
work is the control using PI controller. The comparison of PI and FLC will be
done in future.


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