1956_c03.pdf

1956_C03.fm Page 215 Thursday, August 7, 2003 10:10 PM 3 Positive Output Super-Lift Luo-Converters Voltage lift (VL) technique has been successfully employed in design of DC/ DC converters, e.g., three series Luo-converters. However, the output voltage increases in arithmetic progression. Super-Lift (SL) technique is more pow- erful than VL technique, its voltage transfer gain can be a very large number. SL technique implements the output voltage increasing in geometric pro- gression. It effectively enhances the voltage transfer gain in power series. 3.1 Introduction This chapter introduces positive output super lift Luo-converters. In order to differentiate these converters from existing VL converters, these convert- ers are called positive output super-lift Luo-converters. There are several sub- series: ? Main series — Each circuit of the main series has only one switch S, n inductors for nth stage circuit, 2n capacitors, and (3n – 1) diodes. ? Additional series — Each circuit of the additional series has one switch S, n inductors for nth stage circuit, 2(n + 1) capacitors, and (3n + 1) diodes. ? Enhanced series — Each circuit of the enhanced series has one switch S, n inductors for nth stage circuit, 4n capacitors, and (5n – 1) diodes. ? Re-enhanced series — Each circuit of the re-enhanced series has one switch S, n inductors for nth stage circuit, 6n capacitors, and (7n – 1) diodes. ? Multiple (j)-enhanced series — Each circuit of the multiple (j times)- enhanced series has one switch S, n inductors for nth stage circuit, 2(1 + j)n capacitors and [(3 + 2j)n – 1] diodes. In order to concentrate the voltage enlargement, assume the converters are working in steady state with conti