10-10-2012, 05:04 PM
Control of DC Drive by Bridgeless PFC Boost Topology
Control of DC Drive.pdf (Size: 635.66 KB / Downloads: 44)
Abstract
This paper deals with the simulation of Bridgeless
PFC boost Converter fed DC drive. The Bridgeless circuit is
analyzed, designed and simulated with motor load.
Conventional boost PFC suffers from the high conduction loss
in the input rectifier-bridge. Higher efficiency can be achieved
by using the bridgeless boost topology. In this paper, a
systematic review of bridgeless power factor correction (PFC)
boost rectifiers, also called dual boost PFC rectifiers, is
presented. The circuit has advantages like reduced conduction
loss, reduced harmonics and improved power factor.
INTRODUCTION
Recently, in an effort to improve the efficiency of the
front-end PFC rectifiers, many power supply manufacturers
and some semiconductor companies have started looking into
bridgeless PFC circuit topologies. Generally, the bridgeless
PFC topologies, also referred to as dual boost PFC rectifiers,
may reduce the conduction loss by reducing the number of
semiconductor components in the line current path. The
bridgeless PFC boost implementations have received more
attention. In each circuit, the boost converter is implemented
by replacing a pair of bridge rectifiers with switches and
employing an ac-side boost inductor. With a bridgeless
topology, one rectifier is eliminated from the line-current
path, which minimizes the conduction loss. In this paper, a
systematic review of the bridgeless PFC boost rectifier
implementations that have received the most attention is
presented. The implementations do not suffer from the high
common-mode noise problem. The block diagram of
bridgeless PFC boost converter fed dc drives is shown in Fig.
01.
CONVERTER FED DC DRIVES
Converter-controlled electrical machine drives are very
important in modern industrial applications. Some examples
in the high-power range are metal rolling mills, cement mills,
and gas line compressors. In the medium-power range are
textile mills, paper mills, and subway car propulsion.
Machine tools and computer peripherals are examples of
converter-controlled electrical machine drive applications in
the low-power range. The converter normally provides a
variable-voltage dc power source for a dc motor drive and a
variable-frequency, variable-voltage ac power source for an
ac motor drive. The drive system efficiency is high because
the converter operates in switching mode using power
semiconductor devices. The primary control variable of the
machine may be torque, speed, or position, or the converter
can operate as a solid-state starter of the machine. The recent
evolution of high-frequency power semiconductor devices
and high-density and economical microelectronic chips,
coupled with converter and control technology developments,
is providing a tremendous boost in the applications of drives.
The speed of a dc motor can be controlled by controlling the
dc voltage across its armature terminals. The machine can be
a permanent magnet or wound field type. The wound field
type permits variation and reversal of field and is normally
preferred in large power machines. In this paper Bridgeless
PFC converter is used to control the dc drive under no load
and load conditions.
CONCLUSION
Bridgeless PFC Converter fed dc drives is modeled and
simulated using Mat lab. The simulation studies indicate that
the power factor is nearly unity by employing the Bridgeless
boost converter. This converter has advantages like reduced
hardware, high performance and improved power factor. The
speed torque cure indicates the mechanical characteristic of
dc drives. The smooth speed control is possible with this
bridgeless converter. The simulation results are in line with
the predictions. The hardware implementation will be done in
future.