| Abstract |
In the paper, a group of direct boost AC/DC
converters are mainly dealt with. By analysis, they can employ
the unified control principle |the boost power factor correction
algorithm. In addition, their conversion topologies are very
simple and practical, and they can be used as pre-regulator of
inverter air-conditioners. By placing the power device and boost
inductor in different positions, many new AC/DC converters
can be deduced from the original single-phase controlled bridge
AC/DC converters, a few of which have been mentioned by
some former researchers. Why they have the same working
principle and why they can be employed as single-phase boost
AC/DC with unitary power factor are depicted in detail.
Moreover, for example, one of the single-phase AC/DC
converters, named low-end semi-controlled bridge AC/DC
converter is simulated and implemented as the front-end circuit
of a new-style DC inverter air-conditioner. Consequently, the
input power factor is one approximately and the power output
exceeds 2.5kW. Other deduced AC/DC converters are all
simulated also. The simulated and experimental results are
consistent, as proves the validity of the theoretical analysis. |
