Hello,
I am working on the Class-E DC-DC converter circuit. The efficiency of the circuit is 91% when the circuit simulates with ideal transformer and the 40% efficiency yielding when the circuit simulates with the practical transformer.
As per my knowledge, here the Zero Voltage Switching (ZVS) plays a crucial role in order to get the high efficiency in the Class-E converters.
When comparing the Vds and Vgs waveforms of the ideal and practical transformers are different. The peak of the Vds is high in the practical one when comparing with the ideal. In the Ideal waveforms, the Vds waveform is start to rise after immediate the Vgs (MOSFET) to zero voltage and end the Vds waveform almost Vgs (MOSFET) is ON. In the practical waveforms, the Vds waveform is start to rise after immediate the Vgs (MOSFET) to zero voltage and end the Vds waveform in the middle of Vgs zero voltage then after some time the Vgs (MOSFET) is ON.
Is this Soft Switching (ZVS) or Hard switching?
So, because of this ZVS the efficiency of the converter is low? If it is the major problem, how to over come this problem?
(or)
Is there any parameters affecting on the circuit?
How to reduce the peak of Vds voltage?
How to improve the efficiency of the circuit with practical transformer?
Here, I have attaching the circuit simulation schematic and waveforms.
I am working on the Class-E DC-DC converter circuit. The efficiency of the circuit is 91% when the circuit simulates with ideal transformer and the 40% efficiency yielding when the circuit simulates with the practical transformer.
As per my knowledge, here the Zero Voltage Switching (ZVS) plays a crucial role in order to get the high efficiency in the Class-E converters.
When comparing the Vds and Vgs waveforms of the ideal and practical transformers are different. The peak of the Vds is high in the practical one when comparing with the ideal. In the Ideal waveforms, the Vds waveform is start to rise after immediate the Vgs (MOSFET) to zero voltage and end the Vds waveform almost Vgs (MOSFET) is ON. In the practical waveforms, the Vds waveform is start to rise after immediate the Vgs (MOSFET) to zero voltage and end the Vds waveform in the middle of Vgs zero voltage then after some time the Vgs (MOSFET) is ON.
Is this Soft Switching (ZVS) or Hard switching?
So, because of this ZVS the efficiency of the converter is low? If it is the major problem, how to over come this problem?
(or)
Is there any parameters affecting on the circuit?
How to reduce the peak of Vds voltage?
How to improve the efficiency of the circuit with practical transformer?
Here, I have attaching the circuit simulation schematic and waveforms.
Attachments
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