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	== Study of UIUC circuit ==		== Study of UIUC circuit ==
-	{{study by ''Ameet Deshpande''}}
	UIUC design documents are [[Links#UIUC_Converter_Design| here]].		UIUC design documents are [[Links#UIUC_Converter_Design| here]].
		+	Conclusions of Final report read that
		+	'''The efficiency of the dc-dc converter circuit was unacceptably low. The main reason for the low
		+	efficiency was that the circuit could not be brought up to high power due to MOSFET heating and at low
		+	power the control circuit was taking a considerable percentage of the overall power. If output power
		+	were raised, the amount of power used by the control chip would stay approximately the same and the
		+	percentage of overall power that it consumed would be much less, therefore raising the efficiency. In an effort to get better efficiency or reduce MOSFET heating, flyback converter approach was attempted but we obtained similar unsatisfactory results'''
		+
		+	and in test data (appendix), around 6-12% efficiencies were reported. Converter seemed to work fine in all other respects. (protection, line regulation, ripple factor etc.)
		+
		+	'''Possible cause of inefficiency:'''
		+	I suspect inefficiency is caused due to all reasons below.
		+	*Poor design: The design review document details that the circuit was deigned to give output current of
		+
		+	*Wrong testing:
		+
		+	*Discontinuous charge mode: Inductor current goes to zero.
		+
		+	*High switching in Mosfet:
	== Efficiency analysis of 150V generator ==		== Efficiency analysis of 150V generator ==
	{{study by ''Rathna Kumar'' and ''Ameet Deshpande''}}		{{study by ''Rathna Kumar'' and ''Ameet Deshpande''}}

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Revision as of 07:23, 14 December 2006

Contents 1 Study of UIUC circuit 2 Efficiency analysis of 150V generator

Study of UIUC circuit

UIUC design documents are here. Conclusions of Final report read that The efficiency of the dc-dc converter circuit was unacceptably low. The main reason for the low efficiency was that the circuit could not be brought up to high power due to MOSFET heating and at low power the control circuit was taking a considerable percentage of the overall power. If output power were raised, the amount of power used by the control chip would stay approximately the same and the percentage of overall power that it consumed would be much less, therefore raising the efficiency. In an effort to get better efficiency or reduce MOSFET heating, flyback converter approach was attempted but we obtained similar unsatisfactory results

and in test data (appendix), around 6-12% efficiencies were reported. Converter seemed to work fine in all other respects. (protection, line regulation, ripple factor etc.)

Possible cause of inefficiency: I suspect inefficiency is caused due to all reasons below.

• Poor design: The design review document details that the circuit was deigned to give output current of

• Wrong testing:

• Discontinuous charge mode: Inductor current goes to zero.

• High switching in Mosfet:

Efficiency analysis of 150V generator

[[:Template:Study by Rathna Kumar and Ameet Deshpande]]