ABSTRACT Power factor correction (PFC) Bridge rectifier have

too many analog-to-digital converters (ADCs) are used and hence the corresponding cost is high. In this Project the information on the desired signal is obtained from two paired sawtoothed waves compared with the sensed signal without the use of any ADCs. For the PFC rectifier operating in the continuous conduction mode (CCM).

INTRODUCTION Power factor is defined as ratio of the real

power to the apparent power. In the case of low power factor (PF) the losses in the transmission lines are high. The traditional ac–dc conversion interface consists of one peak rectifier and one linear regulator. Such a peak rectifier has a pulse-type input current, which contains many harmonics. Hence the line voltage is polluted to a certain extent. such a system has low efficiency and is not suitable for high-power applications. Consequently the rectifier with power factor correction (PFC) is presented to overcome the before disadvantages.

BLOCK DIAGRAM

COMPONETS USED

Transformer:

A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. A varying current in the first or primary winding creates a varying magnetic flux in the transformer's core and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF), or "voltage", in the secondary winding. This effect is called inductive coupling.

Specifications:Voltage: 12 VoltType:Step-DownCurrent Rating:500 mA

Interfacing 16 Character x 2 Line LCD: The HD44780U dot-matrix liquid crystal display controller and driver LSI displays alphanumerics

LCD Registers:

In LCDs two types of registers are used they are

Command register:To intializationSetting the cursor positionClearing the display and Controlling the display

using the time sequences

Data register:Showing the data on display and also used for

storing the data

REGULATOR:

These regulators can provide local on card regulation, eliminating the distribution problems associated with single point regulation.

FEATURES:

Output voltage tolerances of ±5% over the temperature range

Output current of 100mAInternal thermal overload protectionOutput voltages of 5.0V, 6.2V, 8.2V, 9.0V, 12V,

15VNo external components

Conclusion: In the conventional method we are use many

ADCs and FPGA controller .so to reduce the cost in this project we are using the DSP controller in continuous conduction mode.

We are studied about the components and we are implement this in further work.

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